Recent ideas about the analog for a three-phase contact line of the Gibbs adsorption equation for interfaces are illustrated in a mean-field density-functional model. With $d¥tau$ the infinitesimal change in the line tension $¥tau$ that accompanies the infinitesimal changes $d¥mu_i$ in the thermodynamic field variables $¥mu_i$ and with $¥Lambda_i$ the line adsorptions, the sum $d¥tau + ¥Sigma ¥Lambda_i d¥mu_i$, unlike its surface analog, is not 0. An equivalent of this sum in the model system is evaluated numerically and analytically. A general line adsorption equation, which the model results illustrate, is derived.
en-copyright= kn-copyright= en-aut-name=KogaKenichiro en-aut-sei=Koga en-aut-mei=Kenichiro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=WidomBenjamin en-aut-sei=Widom en-aut-mei=Benjamin kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=Okayama University affil-num=2 en-affil= kn-affil=Cornell University en-keyword=line tension kn-keyword=line tension en-keyword=line adsorption kn-keyword=line adsorption en-keyword=adsorption equation kn-keyword=adsorption equation en-keyword=three-phase equilibria kn-keyword=three-phase equilibria en-keyword=partial wetting kn-keyword=partial wetting END start-ver=1.4 cd-journal=joma no-vol=127 cd-vols= no-issue=6 article-no= start-page= end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=2007 dt-pub=20070814 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Line and boundary tensions on approach to the wetting transition en-subtitle= kn-subtitle= en-abstract= kn-abstract=A mean-field density-functional model often used in the past in the study of line and boundary tensions at wetting and prewetting transitions is reanalyzed by extensive numerical calculations, approaching the wetting transition much more closely than had previously been possible. The results are what are now believed to be definitive for the model. They include strong numerical evidence for the presence of the logarithmic factors predicted by theory both in the mode of approach of the prewetting line to the triple-point line at the point of the first-order wetting transition and in the line tension itself on approach to that point. It is also demonstrated with convincing numerical precision that the boundary tension on the prewetting line and the line tension on the triple-point line have a common limiting value at the wetting transition, again as predicted by theory. As a by product of the calculations, in the model's symmetric three-phase state, far from wetting, it is found that certain properties of the model's line tension and densities are almost surely given by simple numbers arising from the symmetries, but proving that these are exact for the model remains a challenge to analytical theory. en-copyright= kn-copyright= en-aut-name=KogaKenichiro en-aut-sei=Koga en-aut-mei=Kenichiro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=WidomB. en-aut-sei=Widom en-aut-mei=B. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=Department of Chemistry, Faculty of Science, Okayama University affil-num=2 en-affil= kn-affil=Department of Chemistry, Baker Laboratory, Cornell University en-keyword=SURFACE PHASES kn-keyword=SURFACE PHASES en-keyword=FLUID PHASES kn-keyword=FLUID PHASES en-keyword=SUBSTRATE kn-keyword=SUBSTRATE en-keyword=ADSORPTION kn-keyword=ADSORPTION en-keyword=INTERFACE kn-keyword=INTERFACE en-keyword=CONTACT kn-keyword=CONTACT en-keyword=MODEL kn-keyword=MODEL en-keyword=ICE kn-keyword=ICE END start-ver=1.4 cd-journal=joma no-vol= cd-vols= no-issue= article-no= start-page=586 end-page=591 dt-received= dt-revised= dt-accepted= dt-pub-year=2001 dt-pub=20017 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Motion segmentation by subspace separation and model selection en-subtitle= kn-subtitle= en-abstract= kn-abstract=Reformulating the Costeira-Kanade algorithm as a pure mathematical theorem independent of the Tomasi-Kanade factorization, we present a robust segmentation algorithm by incorporating such techniques as dimension correction, model selection using the geometric AIC, and least-median fitting. Doing numerical simulations, we demonstrate that oar algorithm dramatically outperforms existing methods. It does not involve any parameters which need to be adjusted empirically
en-copyright= kn-copyright= en-aut-name=KanataniKenichi en-aut-sei=Kanatani en-aut-mei=Kenichi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= affil-num=1 en-affil= kn-affil=Okayama University END start-ver=1.4 cd-journal=joma no-vol=59 cd-vols= no-issue=1 article-no= start-page=19 end-page=26 dt-received= dt-revised= dt-accepted= dt-pub-year=2005 dt-pub=200502 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Determination of depression risk factors in children and adolescents by regression tree methodology. en-subtitle= kn-subtitle= en-abstract= kn-abstract=We used a regression tree method (RTM) to determine risks of depression in children/adolescents. The survey records of 4,143 children/adolescents in a study based in Mersin, Turkey served as data in this study, and multi-step, stratified, and cluster sampling were used. Effects of 24 variables (sex, smoking, parental problems, etc.) were evaluated on depression scores. The Child Beck Depression Inventory (CBDI) was used to determine the level of depression. Subjects were into 12 different groups based on magnitudes of mean depression scores. The interactions among 7 variables determined to be risk factors are shown on a schema. The STATISTICA (ver.6.0) package program was used for all computations. Although traditional statistical methods have often been used for analysis in this field, such approaches are associated with certain disadvantages such as missing values, ignorance of interaction effects, or restriction of the shape of the distribution. To avoid such disadvantages, we therefore suggest the use of the RTM in studies involving numerical-based outcome variables and for the investigation of a large number of variables and it may be more effective than traditional statistical methods in epidemiological studies which determine risk factors.
en-copyright= kn-copyright= en-aut-name=CamdevirenHandan en-aut-sei=Camdeviren en-aut-mei=Handan kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=MendesMehmet en-aut-sei=Mendes en-aut-mei=Mehmet kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=OzkanM. Muhip en-aut-sei=Ozkan en-aut-mei=M. Muhip kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=TorosFevziye en-aut-sei=Toros en-aut-mei=Fevziye kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=SasmazTayyar en-aut-sei=Sasmaz en-aut-mei=Tayyar kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= en-aut-name=OnerSeva en-aut-sei=Oner en-aut-mei=Seva kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=6 ORCID= affil-num=1 en-affil= kn-affil=Mersin University affil-num=2 en-affil= kn-affil=Çanakkale Onsekiz Mart University affil-num=3 en-affil= kn-affil=Ankara University affil-num=4 en-affil= kn-affil=Mersin University affil-num=5 en-affil= kn-affil=Mersin University affil-num=6 en-affil= kn-affil=Mersin University en-keyword=children and adolescents kn-keyword=children and adolescents en-keyword=Beck depression inventory kn-keyword=Beck depression inventory en-keyword=classification and regression trees kn-keyword=classification and regression trees en-keyword=cross-yalidation kn-keyword=cross-yalidation en-keyword=diagnostic models kn-keyword=diagnostic models END start-ver=1.4 cd-journal=joma no-vol=70 cd-vols= no-issue=1 article-no= start-page= end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=2004 dt-pub=20047 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Thermodynamics of a two-dimensional Yukawa fluid en-subtitle= kn-subtitle= en-abstract= kn-abstract=Thermodynamic quantities of a two-dimensional Yukawa system, a model for various systems including single-layered dust particles observed in dusty plasmas, are obtained and expressed by simple interpolation formulas. In the domain of weak coupling, the analytical method based on the cluster expansion is applied and, in the domain of intermediate and strong coupling, numerical simulations are performed. Due to reduced dimensionality, the treatment based on the mean field fails at the short range and exact behavior of the binary correlation is to be taken into account even in the case of weak coupling.
en-copyright= kn-copyright= en-aut-name=TotsujiHiroo en-aut-sei=Totsuji en-aut-mei=Hiroo kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=LimanM. Sanusi en-aut-sei=Liman en-aut-mei=M. Sanusi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=TotsujiChieko en-aut-sei=Totsuji en-aut-mei=Chieko kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=TsurutaKenji en-aut-sei=Tsuruta en-aut-mei=Kenji kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=Okayama University affil-num=2 en-affil= kn-affil=Okayama University affil-num=3 en-affil= kn-affil=Okayama University affil-num=4 en-affil= kn-affil=Okayama University en-keyword=dusty plasma kn-keyword=dusty plasma en-keyword=cluster expansion kn-keyword=cluster expansion en-keyword=electron liquids kn-keyword=electron liquids END start-ver=1.4 cd-journal=joma no-vol=29 cd-vols= no-issue=2 article-no= start-page=1958 end-page=1961 dt-received= dt-revised= dt-accepted= dt-pub-year=1993 dt-pub=19933 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Acceleration of convergence characteristic of the ICCG method en-subtitle= kn-subtitle= en-abstract= kn-abstract=The effectiveness of renumbering for the incomplete Cholesky conjugate gradient (ICCG) solver, which is usually applied to direct solvers, is examined quantitatively by analyzing 3D standard benchmark models. On an acceleration factor which is introduced to obtain convergence quickly, indices for determining the optimum value of the acceleration factor, which minimizes the number of iterations, are discussed. It is found that the renumbering is effective to use with the ICCG solver, and the solver using the acceleration factor gives a good convergence characteristic even in the case when the conventional solver fails to provide convergent solutions
en-copyright= kn-copyright= en-aut-name=FujiwaraKoji en-aut-sei=Fujiwara en-aut-mei=Koji kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=NakataTakayoshi en-aut-sei=Nakata en-aut-mei=Takayoshi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=FusayasuHirotsugu en-aut-sei=Fusayasu en-aut-mei=Hirotsugu kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Okayama University affil-num=2 en-affil= kn-affil=Okayama University affil-num=3 en-affil= kn-affil=Matsushita Electric Industrial Coporation Limited en-keyword=convergence of numerical methods kn-keyword=convergence of numerical methods en-keyword=electromagnetic fields kn-keyword=electromagnetic fields en-keyword=finite element analysis kn-keyword=finite element analysis en-keyword=iterative methods kn-keyword=iterative methods END start-ver=1.4 cd-journal=joma no-vol=26 cd-vols= no-issue=2 article-no= start-page=905 end-page=908 dt-received= dt-revised= dt-accepted= dt-pub-year=1990 dt-pub=19903 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Numerical analysis of antenna by a surface patch modeling en-subtitle= kn-subtitle= en-abstract= kn-abstract=A cylindrical dipole antenna is numerically analyzed by the moment method. The surface of the antenna is approximated by triangular patches and the electric field integral equation is used for direct calculation of the surface current distribution. Therefore, the cylinder antenna can be treated in open or closed boundary form. The current expansion functions and the testing functions of the electric field boundary condition are of the triangular type. The surface integrals are numerically solved by a 33-point Gaussian quadrature approximation. The current distribution on a flat plate illuminated by a plane wave and the input admittance of a hollow cylindrical dipole as the near field quantities has been investigated. The convergence of the input admittance against the number of the triangular patches is presented, and the admittance solution is compared with the thin-wire approximation and theoretical results. Finally the CPU time and memory storage size for different numbers of patches are presented. Rapid admittance convergence and few required unknowns per square wavelength are the advantages of surface patch modeling
en-copyright= kn-copyright= en-aut-name=AnalouiM. en-aut-sei=Analoui en-aut-mei=M. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=TsuboiH. en-aut-sei=Tsuboi en-aut-mei=H. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=NakataTakayoshi en-aut-sei=Nakata en-aut-mei=Takayoshi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Okayama University affil-num=2 en-affil= kn-affil=Okayama University affil-num=3 en-affil= kn-affil=Okayama University en-keyword=antenna theory kn-keyword=antenna theory en-keyword=convergence of numerical methods kn-keyword=convergence of numerical methods en-keyword=current distribution kn-keyword=current distribution en-keyword=dipole antennas kn-keyword=dipole antennas en-keyword=electric admittance kn-keyword=electric admittance en-keyword=integral equations kn-keyword=integral equations en-keyword=numerical analysis kn-keyword=numerical analysis END start-ver=1.4 cd-journal=joma no-vol=70 cd-vols= no-issue=2 article-no= start-page= end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=2004 dt-pub=20048 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Multicriticality of the three-dimensional Ising model with plaquette interactions: an extension of novotny's transfer-matrix formalism en-subtitle= kn-subtitle= en-abstract= kn-abstract=A three-dimensional Ising model with the plaquette-type (next-nearest-neighbor and four-spin) interactions is investigated numerically. This extended Ising model, the so-called gonihedric model, was introduced by Savvidy and Wegner as a discretized version of the interacting (closed) surfaces without surface tension. The gonihedric model is notorious for its slow relaxation to the thermal equilibrium (glassy behavior), which deteriorates the efficiency of the Monte Carlo sampling. We employ the transfer-matrix (TM) method, implementing Novotny's idea, which enables us to treat an arbitrary number of spins N for one TM slice even in three dimensions. This arbitrariness admits systematic finite-size-scaling analyses. Accepting the extended parameter space by Cirillo , we analyzed the (multi-) criticality of the gonihedric model for Nless than or equal to13. Thereby, we found that, as first noted by Cirillo analytically (cluster-variation method), the data are well described by the multicritical (crossover) scaling theory. That is, the previously reported nonstandard criticality for the gonihedric model is reconciled with a crossover exponent and the ordinary three-dimensional-Ising universality class. We estimate the crossover exponent and the correlation-length critical exponent at the multicritical point as phi=0.6(2) and (nu) over dot =0.45(15), respectively.
en-copyright= kn-copyright= en-aut-name=NishiyamaYoshihiro en-aut-sei=Nishiyama en-aut-mei=Yoshihiro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= affil-num=1 en-affil= kn-affil=Okayama University en-keyword=self-avoiding surfaces kn-keyword=self-avoiding surfaces en-keyword=critical-behavior kn-keyword=critical-behavior en-keyword=glassy behavior kn-keyword=glassy behavior en-keyword=spin kn-keyword=spin en-keyword=systems kn-keyword=systems en-keyword=lattice kn-keyword=lattice en-keyword=dimensions kn-keyword=dimensions END start-ver=1.4 cd-journal=joma no-vol=26 cd-vols= no-issue=5 article-no= start-page= end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=1990 dt-pub=19909 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=A simplification of boundary element model with rotational symmetry in electromagnetic field analysis en-subtitle= kn-subtitle= en-abstract= kn-abstract=A simplification method for the boundary element model with rotational symmetry is described. When the boundary element model has a rotational symmetry, the region to be treated for boundary integrations can be reduced to the fundamental boundary surface. This reduction is possible because the coefficient matrix of the final simultaneous equations for the model can be transformed to a block diagonal matrix by a transformation matrix using spatial eigenmodes. The simplification reduces the computation time and storage capacity because the coefficient matrix of the final simultaneous equations of the boundary element method is dense. Computation results for a four-wire method demonstrate the applicability of the proposed simplification method
en-copyright= kn-copyright= en-aut-name=TsuboiH. en-aut-sei=Tsuboi en-aut-mei=H. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=SakuraiA. en-aut-sei=Sakurai en-aut-mei=A. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=NaitoT. en-aut-sei=Naito en-aut-mei=T. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Okayama University affil-num=2 en-affil= kn-affil=Okayama University affil-num=3 en-affil= kn-affil=Fuji Electric Corporate Research and Development, Limited en-keyword=boundary-elements methods kn-keyword=boundary-elements methods en-keyword=electromagnetic field theory kn-keyword=electromagnetic field theory en-keyword=numerical methods kn-keyword=numerical methods END start-ver=1.4 cd-journal=joma no-vol=38 cd-vols= no-issue=2 article-no= start-page=889 end-page=892 dt-received= dt-revised= dt-accepted= dt-pub-year=2002 dt-pub=20023 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=A proposal of finite-element analysis considering two-dimensional magnetic properties en-subtitle= kn-subtitle= en-abstract= kn-abstract=A technique for analyzing the magnetic field in anisotropic material using the effective anisotropic reluctivity proposed by Enokizono is examined. It is shown that the Enokizono model can be transformed into another model having a conventional form. By expanding the examination of such a conventional form, a new finite element formulation for taking account of the two-dimensional (2-D) magnetic property is proposed. As the modeling of the 2-D magnetic property at the high flux density region is important in the practical analysis of the magnetic device, the extrapolation method of the magnetic property is examined. It is shown that the Bezier interpolation is fairly effective to stabilize the convergence characteristic of the Newton-Raphson (N-R) iteration in the nonlinear magnetic field analysis, taking account of the 2-D magnetic property
en-copyright= kn-copyright= en-aut-name=FujiwaraKoji en-aut-sei=Fujiwara en-aut-mei=Koji kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=AdachiTakayuki en-aut-sei=Adachi en-aut-mei=Takayuki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=TakahashiNorio en-aut-sei=Takahashi en-aut-mei=Norio kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Okayama University affil-num=2 en-affil= kn-affil=Okayama University affil-num=3 en-affil= kn-affil=Okayama University en-keyword=Newton-Raphson method kn-keyword=Newton-Raphson method en-keyword=convergence of numerical methods kn-keyword=convergence of numerical methods en-keyword=extrapolation kn-keyword=extrapolation en-keyword=finite element kn-keyword=finite element en-keyword=analysis kn-keyword=analysis en-keyword=interpolation kn-keyword=interpolation en-keyword=magnetic anisotropy kn-keyword=magnetic anisotropy en-keyword=magnetic materials kn-keyword=magnetic materials END start-ver=1.4 cd-journal=joma no-vol=26 cd-vols= no-issue=2 article-no= start-page=799 end-page=802 dt-received= dt-revised= dt-accepted= dt-pub-year=1990 dt-pub=19903 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Triangular mesh generation using knowledge base for three-dimensional boundary element method en-subtitle= kn-subtitle= en-abstract= kn-abstract=The authors propose a method of triangular mesh generation using a knowledge base for three-dimensional boundary-element methods. To ensure a flexible and expandable mesh generator, the kernel of the mesh generator is coded in Lisp rather than in a procedural language and the knowledge base of the mesh generator is separated from the execution module. The procedure for the mesh generation is decided by rules in the knowledge base and the meshing pattern of the computation model is selected by the input data. This means that a goal is given by the input data and the meshing is done by using the rules in the knowledge base in order to achieve the goal. A data structure of the surfaces and boundary elements suitable for a Lisp system is proposed that makes it easy to treat the complex data structure in meshing processes
en-copyright= kn-copyright= en-aut-name=TsuboiH. en-aut-sei=Tsuboi en-aut-mei=H. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=ShimotsukasaT. en-aut-sei=Shimotsukasa en-aut-mei=T. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=KatoK. en-aut-sei=Kato en-aut-mei=K. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Okayama University affil-num=2 en-affil= kn-affil=Okayama University affil-num=3 en-affil= kn-affil=Japan Exlan Co., Ltd en-keyword=boundary-elements methods kn-keyword=boundary-elements methods en-keyword=electrical engineering computing kn-keyword=electrical engineering computing en-keyword=electromagnetic field theory kn-keyword=electromagnetic field theory en-keyword=numerical methods kn-keyword=numerical methods END start-ver=1.4 cd-journal=joma no-vol=70 cd-vols= no-issue=1 article-no= start-page= end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=2004 dt-pub=20047 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Folding of the triangular lattice in a discrete three-dimensional space: density-matrix renormalization-group study en-subtitle= kn-subtitle= en-abstract= kn-abstract=Folding of the triangular lattice in a discrete three-dimensional space is investigated numerically. Such "discrete folding" has come about through theoretical investigation, since Bowick and co-workers introduced it as a simplified model for the crumpling of the phantom polymerized membranes. So far, it has been analyzed with the hexagon approximation of the cluster variation method (CVM). However, the possible systematic error of the approximation was not fully estimated; in fact, it has been known that the transfer-matrix calculation is limited in the tractable strip widths Lless than or equal to6. Aiming to surmount this limitation, we utilized the density-matrix renormalization group. Thereby, we succeeded in treating strip widths up to L=29 which admit reliable extrapolations to the thermodynamic limit. Our data indicate an onset of a discontinuous crumpling transition with the latent heat substantially larger than the CVM estimate. It is even larger than the latent heat of the planar (two-dimensional) folding, as first noticed by the preceding CVM study. That is, contrary to our naive expectation, the discontinuous character of the transition is even promoted by the enlargement of the embedding-space dimensions. We also calculated the folding entropy, which appears to lie within the best analytical bound obtained previously via combinatorics arguments.
en-copyright= kn-copyright= en-aut-name=NishiyamaYoshihiro en-aut-sei=Nishiyama en-aut-mei=Yoshihiro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= affil-num=1 en-affil= kn-affil=Okayama University en-keyword=crystalline random surfaces kn-keyword=crystalline random surfaces en-keyword=crumpling transition kn-keyword=crumpling transition en-keyword=statisticalmechanics kn-keyword=statisticalmechanics en-keyword=tethered surfaces kn-keyword=tethered surfaces en-keyword=membranes kn-keyword=membranes en-keyword=phase kn-keyword=phase END start-ver=1.4 cd-journal=joma no-vol=26 cd-vols= no-issue=2 article-no= start-page= end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=1990 dt-pub=19903 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=A new approach to the transient analysis of magnetic field with variable transformation based on eigenvalues en-subtitle= kn-subtitle= en-abstract= kn-abstract=A novel approach to the transient analysis of a magnetic field is presented that uses the formulation of a boundary-element model in two-dimensional problems. In order to solve the transient problems, state equations are formed using the boundary element model, and are solved using the variable transformation based on eigenvalues. The computational accuracy of the proposed method is evaluated by an infinite plate model and an infinite cylinder model in which the impressed magnetic flux densities are given by a unit step function and a sinusoidal function respectively
en-copyright= kn-copyright= en-aut-name=TsuboiH. en-aut-sei=Tsuboi en-aut-mei=H. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=TanakaM. en-aut-sei=Tanaka en-aut-mei=M. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=NaitoT. en-aut-sei=Naito en-aut-mei=T. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Okayama University affil-num=2 en-affil= kn-affil=Okayama University affil-num=3 en-affil= kn-affil=Fuji Electric Corporate Research and Development, Limited en-keyword=boundary-elements methods kn-keyword=boundary-elements methods en-keyword=eigenvalues and eigenfunctions kn-keyword=eigenvalues and eigenfunctions en-keyword=magnetic fields kn-keyword=magnetic fields en-keyword=numerical methods kn-keyword=numerical methods en-keyword=partial differential equations kn-keyword=partial differential equations END start-ver=1.4 cd-journal=joma no-vol=35 cd-vols= no-issue=3 article-no= start-page=1243 end-page=1246 dt-received= dt-revised= dt-accepted= dt-pub-year=1999 dt-pub=19995 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Problems in practical finite element analysis using Preisach hysteresis model en-subtitle= kn-subtitle= en-abstract= kn-abstract=An efficient method, which is called the “inverse distribution function method”, for calculating the magnetic field strength H from the flux density B through the Preisach model is developed. By using the method, H can be directly obtained without iteration from B which is calculated by the usual FEM, with the magnetic vector potential as an unknown variable. The effects of the dimension n of the inverse distribution function on the CPU time and the memory requirements are investigated through a numerical example by increasing the dimension n of the inverse distribution function. It is shown that the additional CPU time for taking account of hysteresis is negligible when n is less than about 200
en-copyright= kn-copyright= en-aut-name=TakahashiNorio en-aut-sei=Takahashi en-aut-mei=Norio kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=MiyabaraShun-ichi en-aut-sei=Miyabara en-aut-mei=Shun-ichi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=FujiwaraKoji en-aut-sei=Fujiwara en-aut-mei=Koji kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Okayama University affil-num=2 en-affil= kn-affil=Okayama University affil-num=3 en-affil= kn-affil=Okayama University en-keyword=finite element analysis kn-keyword=finite element analysis en-keyword=magnetic fields kn-keyword=magnetic fields en-keyword=magnetic flux kn-keyword=magnetic flux en-keyword=magnetic hysteresis kn-keyword=magnetic hysteresis en-keyword=magnetic materials kn-keyword=magnetic materials END start-ver=1.4 cd-journal=joma no-vol=32 cd-vols= no-issue=3 article-no= start-page=804 end-page=807 dt-received= dt-revised= dt-accepted= dt-pub-year=1996 dt-pub=19965 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Improvement of convergence characteristic of ICCG method for the A-φ method using edge elements en-subtitle= kn-subtitle= en-abstract= kn-abstract=The effect of the scalar potential φ in the A-φ method on the convergence characteristic of the incomplete Cholesky conjugate gradient (ICCG) method using the edge element is investigated. Several 3-D eddy current models are analyzed both by taking into account φ and neglecting φ to compare the convergence characteristics. It is illustrated that the CPU time using φ is less than ½ of that neglecting φ, and there are some models in which the use of φ enables us to obtain convergent solutions
en-copyright= kn-copyright= en-aut-name=FujiwaraKoji en-aut-sei=Fujiwara en-aut-mei=Koji kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=NakataTakayoshi en-aut-sei=Nakata en-aut-mei=Takayoshi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=OhashiHiromitsu en-aut-sei=Ohashi en-aut-mei=Hiromitsu kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Okayama University affil-num=2 en-affil= kn-affil=Okayama University affil-num=3 en-affil= kn-affil=Okayama University en-keyword=computational complexity kn-keyword=computational complexity en-keyword=conjugate gradient methods kn-keyword=conjugate gradient methods en-keyword=convergence of numerical methods kn-keyword=convergence of numerical methods en-keyword=eddy currents kn-keyword=eddy currents en-keyword=electrical engineering kn-keyword=electrical engineering en-keyword=electrical engineering computing kn-keyword=electrical engineering computing en-keyword=finite element analysis kn-keyword=finite element analysis END start-ver=1.4 cd-journal=joma no-vol=30 cd-vols= no-issue=5 article-no= start-page=3395 end-page=3398 dt-received= dt-revised= dt-accepted= dt-pub-year=1994 dt-pub=19949 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=An improved numerical analysis of flux distributions in anisotropic materials en-subtitle= kn-subtitle= en-abstract= kn-abstract=The method for analyzing flux distributions in transformer cores made of grain-oriented silicon steel is improved in order to reduce error in calculation due to anisotropy in magnetic materials. A model to verify the improved method is proposed, and the calculated results are compared with measured ones
en-copyright= kn-copyright= en-aut-name=NakataTakayoshi en-aut-sei=Nakata en-aut-mei=Takayoshi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=FujiwaraK. en-aut-sei=Fujiwara en-aut-mei=K. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=TakahashiN. en-aut-sei=Takahashi en-aut-mei=N. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=NakanoMasanori en-aut-sei=Nakano en-aut-mei=Masanori kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=OkamotoN. en-aut-sei=Okamoto en-aut-mei=N. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= affil-num=1 en-affil= kn-affil=Okayama University affil-num=2 en-affil= kn-affil=Okayama University affil-num=3 en-affil= kn-affil=Okayama University affil-num=4 en-affil= kn-affil=Okayama University affil-num=5 en-affil= kn-affil=Okayama University en-keyword=ferromagnetic properties of substances kn-keyword=ferromagnetic properties of substances en-keyword=iron alloys kn-keyword=iron alloys en-keyword=magnetic anisotropy kn-keyword=magnetic anisotropy en-keyword=magnetic cores kn-keyword=magnetic cores en-keyword=magnetic flux kn-keyword=magnetic flux en-keyword=numerical analysis kn-keyword=numerical analysis en-keyword=silicon alloys kn-keyword=silicon alloys en-keyword=transformer cores kn-keyword=transformer cores END start-ver=1.4 cd-journal=joma no-vol=32 cd-vols= no-issue=3 article-no= start-page=749 end-page=752 dt-received= dt-revised= dt-accepted= dt-pub-year=1996 dt-pub=19965 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Linear AC steady-state eddy current analysis of high speed conductor using moving coordinate system en-subtitle= kn-subtitle= en-abstract= kn-abstract=A method for linear analysis of AC steady state eddy currents in a moving conductor using a moving coordinate system is investigated. It is shown that the moving coordinate system is superior to a fixed coordinate system for the analysis of a high speed conductors from the standpoint of stability of the solution. The applicable extent of the moving coordinate system is also discussed for the modelling of electric machine characteristics
en-copyright= kn-copyright= en-aut-name=MuramatsuKazuhiro en-aut-sei=Muramatsu en-aut-mei=Kazuhiro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=NakataTakayoshi en-aut-sei=Nakata en-aut-mei=Takayoshi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=TakahashiNorio en-aut-sei=Takahashi en-aut-mei=Norio kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=FujiwaraKoji en-aut-sei=Fujiwara en-aut-mei=Koji kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=Okayama University affil-num=2 en-affil= kn-affil=Okayama University affil-num=3 en-affil= kn-affil=Okayama University affil-num=4 en-affil= kn-affil=Okayama University en-keyword=AC machines kn-keyword=AC machines en-keyword=eddy currents kn-keyword=eddy currents en-keyword=machine theory kn-keyword=machine theory en-keyword=machine windings kn-keyword=machine windings en-keyword=numerical stability kn-keyword=numerical stability END start-ver=1.4 cd-journal=joma no-vol=25 cd-vols= no-issue=5 article-no= start-page=3602 end-page=3604 dt-received= dt-revised= dt-accepted= dt-pub-year=1989 dt-pub=19899 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Electromagnetic field analysis of the wire antenna in the presence of a dielectric with three-dimensional shape en-subtitle= kn-subtitle= en-abstract= kn-abstract=A numerical method which can take account of lossy dielectrics near the antenna has to be developed for the design of the radio-frequency antenna in magnetic resonance imaging, since the human body is a lossy dielectric. A combination of the moment method and the boundary element method is proposed. In the proposed method, the scattering field of dielectrics in the moment method is calculated by using the equations of the boundary element method, and the impressed field of current distribution in the boundary element method is calculated by using the approximation of the current distribution in the moment method. A helical antenna loaded with a cylinder was chosen as a calculation model, and the calculated results were compared with experimental results, verifying the method's applicability
en-copyright= kn-copyright= en-aut-name=TsuboiH. en-aut-sei=Tsuboi en-aut-mei=H. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=TanakaH. en-aut-sei=Tanaka en-aut-mei=H. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=FujitaM. en-aut-sei=Fujita en-aut-mei=M. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Okayama University affil-num=2 en-affil= kn-affil=Okayama University affil-num=3 en-affil= kn-affil=Fuji Electric Corporate Research and Development, Limited en-keyword=antenna radiation patterns kn-keyword=antenna radiation patterns en-keyword=biomedical NMR kn-keyword=biomedical NMR en-keyword=boundary-elements methods kn-keyword=boundary-elements methods en-keyword=loop antennas kn-keyword=loop antennas END start-ver=1.4 cd-journal=joma no-vol= cd-vols= no-issue= article-no= start-page= end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=1994 dt-pub=199412 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=A construction of multivariable MRACS with fixed compensator using coprime factorization approach en-subtitle= kn-subtitle= en-abstract= kn-abstract=A multivariable model reference adaptive control system (MRACS) with a fixed compensator is proposed. First, a new two-degree-of-freedom (2DOF) compensator with disturbance estimator is derived. Using this structure, a multivariable MRACS with fixed compensator is constructed. Since the proposed method is based on the 2 DOF structure, the fixed compensator is chosen independently of specifications for reference commands. The boundedness of all signals in the closed-loop system and the convergence of the output error are proved. A design method of the fixed compensator for MRACS with low sensitivity is also given. Finally, numerical examples are illustrated in order to show the effectiveness of the proposed method
en-copyright= kn-copyright= en-aut-name=MasudaShiro en-aut-sei=Masuda en-aut-mei=Shiro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=InoueAkira en-aut-sei=Inoue en-aut-mei=Akira kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=SugimotoKenji en-aut-sei=Sugimoto en-aut-mei=Kenji kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Okayama University affil-num=2 en-affil= kn-affil=Okayama University affil-num=3 en-affil= kn-affil=Okayama University en-keyword=closed loop systems kn-keyword=closed loop systems en-keyword=compensation kn-keyword=compensation en-keyword=control system synthesis kn-keyword=control system synthesis en-keyword=convergence kn-keyword=convergence en-keyword=model kn-keyword=model en-keyword=reference adaptive control systems kn-keyword=reference adaptive control systems en-keyword=multivariable control systems kn-keyword=multivariable control systems END start-ver=1.4 cd-journal=joma no-vol=3 cd-vols= no-issue= article-no= start-page=1748 end-page=1753 dt-received= dt-revised= dt-accepted= dt-pub-year=1998 dt-pub=19985 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Recognition of paper currencies by hybrid neural network en-subtitle= kn-subtitle= en-abstract= kn-abstract=For the recognition of paper currencies by image processing, the two steps data processing approach can yield high performance. The two steps include “recognition” and “verification” steps. In the current recognition machine, a simple statistical test is used as the verification step, where univariate Gaussian distribution is employed. Here we propose the use of the probability density formed by a multivariable Gaussian function, where the input data space is transferred to a lower dimensional subspace. Due to the structure of this model, we refer the total processing system as a hybrid neural network. Since the computation of the verification model only needs the inner product and square, the computational load is very small. In this paper, the method and numerical experimental results are shown by using the real data and the recognition machine
en-copyright= kn-copyright= en-aut-name=TanakaMasahiro en-aut-sei=Tanaka en-aut-mei=Masahiro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=TakedaFumiaki en-aut-sei=Takeda en-aut-mei=Fumiaki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=OhkouchiKazuya en-aut-sei=Ohkouchi en-aut-mei=Kazuya kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=MichiyukiYasuyo en-aut-sei=Michiyuki en-aut-mei=Yasuyo kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=Okayama University affil-num=2 en-affil= kn-affil=Glory Corporation Limited affil-num=3 en-affil= kn-affil=Okayama University affil-num=4 en-affil= kn-affil=Okayama University en-keyword=bank data processing kn-keyword=bank data processing en-keyword=computer vision kn-keyword=computer vision en-keyword=feature extraction kn-keyword=feature extraction en-keyword=image recognition kn-keyword=image recognition en-keyword=multilayer perceptrons kn-keyword=multilayer perceptrons en-keyword=probability kn-keyword=probability END start-ver=1.4 cd-journal=joma no-vol=1 cd-vols= no-issue= article-no= start-page=4786 end-page=4789 dt-received= dt-revised= dt-accepted= dt-pub-year=2006 dt-pub=20066 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=On-line Identification of Electro-Conductivity in Electrolytic Solutions en-subtitle= kn-subtitle= en-abstract= kn-abstract=An on-line method is proposed to identify electro-conductivity in electrolytic solutions. The method uses a model of a cell of electrolytic solutions in a micro reactor modeled by an electronic circuit. The circuit consists of a cell part with a resister and a capacitor connected in series and a measurement part having a resister. Then the resistance and the capacitance of the cell part are identified to calculate the electro-conductivity. The identification scheme is the least-square method with a forgetting factor calculated on-line. To avoid the effect of differentiation of measured signals, a filter is added to the identification method. The effectiveness of the proposed control scheme is shown by numerical simulation.
en-copyright= kn-copyright= en-aut-name=InoueAkira en-aut-sei=Inoue en-aut-mei=Akira kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=DengMingcong en-aut-sei=Deng en-aut-mei=Mingcong kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=HaradaTakafumi en-aut-sei=Harada en-aut-mei=Takafumi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=BabaYusuke en-aut-sei=Baba en-aut-mei=Yusuke kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=MoriokaNobuhide en-aut-sei=Morioka en-aut-mei=Nobuhide kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= en-aut-name=MutouAkinori en-aut-sei=Mutou en-aut-mei=Akinori kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=6 ORCID= en-aut-name=UekiNobuyuki en-aut-sei=Ueki en-aut-mei=Nobuyuki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=7 ORCID= affil-num=1 en-affil= kn-affil=Okayama University affil-num=2 en-affil= kn-affil=Okayama University affil-num=3 en-affil= kn-affil=Okayama University affil-num=4 en-affil= kn-affil=Okayama University affil-num=5 en-affil= kn-affil=Okayama University affil-num=6 en-affil= kn-affil=Okayama University affil-num=7 en-affil= kn-affil=Okayama University en-keyword=Conductivity kn-keyword=Conductivity en-keyword=Electrolytic solutions kn-keyword=Electrolytic solutions en-keyword=Parameter identification kn-keyword=Parameter identification END start-ver=1.4 cd-journal=joma no-vol=4 cd-vols= no-issue= article-no= start-page=3780 end-page=3784 dt-received= dt-revised= dt-accepted= dt-pub-year=2000 dt-pub=200012 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Modeling uncertainty of large flexible structures with unknown modal parameters en-subtitle= kn-subtitle= en-abstract= kn-abstract=A procedure for control-oriented modeling of uncertainty is proposed for large flexible structures. Techniques on quantification of errors in modal truncated nominal models are developed for the case where a finite number of upper and lower bounds of the unknown modal parameters are given. A feasible set of systems matching the conditions is introduced, and then error bounds covering the feasible set are established in the frequency domain. The bounds are easily checked using linear programming for any user-specified frequency. The feasibility of the proposed scheme is illustrated by numerical study on an ideal flexible beam example. en-copyright= kn-copyright= en-aut-name=ImaiJun en-aut-sei=Imai en-aut-mei=Jun kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=WadaKiyoshi en-aut-sei=Wada en-aut-mei=Kiyoshi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=Department of Electrical and Electronic Engineering Okayama University affil-num=2 en-affil= kn-affil=Department of Electrical and Electronic Systems Engineering Kyushu University en-keyword=error analysis kn-keyword=error analysis en-keyword=flexible structures kn-keyword=flexible structures en-keyword=frequency-domain analysis kn-keyword=frequency-domain analysis en-keyword=linear programming kn-keyword=linear programming en-keyword=modelling kn-keyword=modelling en-keyword=parameter estimation kn-keyword=parameter estimation en-keyword=uncertain systems kn-keyword=uncertain systems END start-ver=1.4 cd-journal=joma no-vol=25 cd-vols= no-issue= article-no= start-page=25 end-page=32 dt-received= dt-revised= dt-accepted= dt-pub-year=2003 dt-pub=200308 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Analysis of polymeric biodegradability based on experimental results and numerical simulation kn-title=実験結果と数値シミュレーションによるポリマー生分解性解析 en-subtitle= kn-subtitle= en-abstract= kn-abstract=We describe techniques that we developed previously in studies of biodegradation of polymeric compounds. We present some experimental results concerning biodegradation of polyethylene. We introduce a mathematical model that govern the evolution of the weight distribution, and show how its inverse problem can be analyzed. We also introduce a mathematical model that governs the evolution of the weight distribution of polymeric compound subjected to enzymatic degradation, and present some numerical results concerning enzymatic degradation of polyvinyl alcohol. en-copyright= kn-copyright= en-aut-name=WatanabeMasaji en-aut-sei=Watanabe en-aut-mei=Masaji kn-aut-name=渡辺雅二 kn-aut-sei=渡辺 kn-aut-mei=雅二 aut-affil-num=1 ORCID= en-aut-name=KawaiFusako en-aut-sei=Kawai en-aut-mei=Fusako kn-aut-name=河合富佐子 kn-aut-sei=河合 kn-aut-mei=富佐子 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=岡山大学環境理工学部環境数理学科 affil-num=2 en-affil= kn-affil=岡山大学資源生物科学研究所 en-keyword=biodegradation kn-keyword=biodegradation en-keyword=mathematical model kn-keyword=mathematical model en-keyword=numerical simulation kn-keyword=numerical simulation en-keyword=polyethylene kn-keyword=polyethylene en-keyword=polyvinyl alcohol kn-keyword=polyvinyl alcohol END start-ver=1.4 cd-journal=joma no-vol=26 cd-vols= no-issue= article-no= start-page=17 end-page=22 dt-received= dt-revised= dt-accepted= dt-pub-year=2004 dt-pub=200411 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Analysis of biodegradability for polyethylene glycol via numerical simulation kn-title=数値シミュレーションによるポリエチレングリコール生分解性解析 en-subtitle= kn-subtitle= en-abstract= kn-abstract=We examined the biodegradability of polyethylene glycol by analyzing gel permeation chromatography patterns, which were obtained before and after cultivation of a microbial consortium E-1 in culture media containing polyethylene glycol as its sole carbon source. We solved an inverse problem of the initial value problem, which consists of an exogenous depolymerization model and the initial weight distribution, in order to determine an oxidation rate, for which the solution of the initial value problem also satisfies the final condition. Given the oxidation rate, we simulated the transition of the weight distribution solving the initial value problem. We interpret the result that reflects a physical significance of the molecular weight on the oxidation rate, and reach a conclusion concerning the role of the membrane transport in exogenous depolymerization processes. en-copyright= kn-copyright= en-aut-name=WatanabeMasaji en-aut-sei=Watanabe en-aut-mei=Masaji kn-aut-name=渡辺雅二 kn-aut-sei=渡辺 kn-aut-mei=雅二 aut-affil-num=1 ORCID= en-aut-name=KawaiFusako en-aut-sei=Kawai en-aut-mei=Fusako kn-aut-name=河合富佐子 kn-aut-sei=河合 kn-aut-mei=富佐子 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=岡山大学環境理工学部 affil-num=2 en-affil= kn-affil=岡山大学資源生物科学研究所 en-keyword=biodegradation kn-keyword=biodegradation en-keyword=polyethylene glycol kn-keyword=polyethylene glycol en-keyword=exogenous depolymerization kn-keyword=exogenous depolymerization en-keyword=mathematical model kn-keyword=mathematical model en-keyword=numerical simulation kn-keyword=numerical simulation END start-ver=1.4 cd-journal=joma no-vol=4 cd-vols= no-issue=1 article-no= start-page=19 end-page=35 dt-received= dt-revised= dt-accepted= dt-pub-year=1999 dt-pub=19990226 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Assessment of Local Influence in Statistical Modelling with Equality Constraints kn-title=等式制約を含む統計モデルにおける局所影響の評価 en-subtitle= kn-subtitle= en-abstract=Influence analysis in the sense of Cook (1986)'s local influence is derived for statistical modelling with equality constraints. It is a supplement to Tanaka and Zhang (1998) and its formulation is an extension of that of Kwan and Fung (1998) so that it can deal with the influence on an arbitrary subset of parameters. As a special case the influence in principal component analysis is discussed and a numerical example is shown. The numerical results are compared with those by Zhang et al. (1998), in which local influence is evaluated by using the perturbation theory of eigenvalue problems, and the relationship is discussed with the influence functions derived by Tanaka and Watadani (1992). kn-abstract= en-copyright= kn-copyright= en-aut-name=ZhangFanghong en-aut-sei=Zhang en-aut-mei=Fanghong kn-aut-name=張方紅 kn-aut-sei=張 kn-aut-mei=方紅 aut-affil-num=1 ORCID= en-aut-name=MoriYuichi en-aut-sei=Mori en-aut-mei=Yuichi kn-aut-name=森裕一 kn-aut-sei=森 kn-aut-mei=裕一 aut-affil-num=2 ORCID= en-aut-name=TanakaYutaka en-aut-sei=Tanaka en-aut-mei=Yutaka kn-aut-name=田中豊 kn-aut-sei=田中 kn-aut-mei=豊 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 en-keyword=Cook's local influence kn-keyword=Cook's local influence en-keyword=equality constraints kn-keyword=equality constraints en-keyword=principal component analysis kn-keyword=principal component analysis en-keyword=subsets of parameters kn-keyword=subsets of parameters END start-ver=1.4 cd-journal=joma no-vol=2009 cd-vols= no-issue=1 article-no= start-page=164 end-page=169 dt-received= dt-revised= dt-accepted= dt-pub-year=2009 dt-pub=20091110 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Production lot size models for perishable seasonal products en-subtitle= kn-subtitle= en-abstract= kn-abstract=Seasonal items like fruits, fish, winter cosmetics, fashion apparel, etc. generally exhibits different demand patterns at various times during the season. Production and inventory planning must reflect this property for cost effectiveness and optimization of resources. This paper presents two production-inventory models for perishable seasonal products that minimize total inventory costs. The models obtains optimal production run time and optimal production quantity for cases when the production rate is constant and when it is allowed to vary with demand. The products are assumed to deteriorate at an exponential rate and demand for them follows a three-phase ramp type pattern during the season. Numerical examples and sensitivity analysis are carried out. Production run time and production quantity obtained by the model were found to be independent of cost parameters. The variable production rate strategy was also found to give lower inventory costs and production quantity than the constant production rate strategy. en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=IbraheemAbdul kn-aut-sei=Ibraheem kn-aut-mei=Abdul aut-affil-num=1 ORCID= en-aut-name=MurataAtsuo en-aut-sei=Murata en-aut-mei=Atsuo kn-aut-name=村田厚生 kn-aut-sei=村田 kn-aut-mei=厚生 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=Okayama University affil-num=2 en-affil= kn-affil=Okayama University END start-ver=1.4 cd-journal=joma no-vol=2009 cd-vols= no-issue=1 article-no= start-page=158 end-page=163 dt-received= dt-revised= dt-accepted= dt-pub-year=2009 dt-pub=20091110 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=An optimal EOQ model for perishable products with varying demand pattern en-subtitle= kn-subtitle= en-abstract= kn-abstract=The demand pattern for most perishable products varies during their life cycle in the market. These variations must be properly reflected in inventory management in order to prevent unnecessary stock-out or excess inventory with associated increase in cost. In this paper, a multi-period economic order quantity (EOQ) model for managing the inventory of perishable items having varying demand pattern is presented. The model was formulated using a general ramp-type demand function that allows three-phase variation in demand pattern. These phases represent the growth, the steady and the decline phases commonly experienced by the demand for most products during their life cycle in the market. The model generates replenishment policies that guarantees optimal inventory cost for all the phases. Numerical experiments and sensitivity analysis were carried out to demonstrate the suitability of the model for a wide range of seasonal products. Result of the experiments revealed that the points at which demand pattern changes are critical points in managing inventory of products with ramp type demand. en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=IbraheemAbdul kn-aut-sei=Ibraheem kn-aut-mei=Abdul aut-affil-num=1 ORCID= en-aut-name=MurataAtsuo en-aut-sei=Murata en-aut-mei=Atsuo kn-aut-name=村田厚生 kn-aut-sei=村田 kn-aut-mei=厚生 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=Okayama University affil-num=2 en-affil= kn-affil=Okayama University END start-ver=1.4 cd-journal=joma no-vol=33 cd-vols= no-issue=2 article-no= start-page=25 end-page=37 dt-received= dt-revised= dt-accepted= dt-pub-year=1999 dt-pub=19990427 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=A Numerical Study on the Performance of an Open-type Flat-plate Solar Collector en-subtitle= kn-subtitle= en-abstract= kn-abstract=A set mathematical models was developed for predicting the performance of an open-type flat-plate solar collector, and solved numerically through an implicit difference method. The effects of various parameters on the absorption of solar energy for the collector were investigated. The results showed that the solar energy absorptance of the open-type flat-plate collector was relatively high especially for the region where the weather was humid and hot, and there were an optimum length and an optimum tilt angle for the absorbing plate on which the collector could obtain the highest solar energy absorptance. It was found that the latent heat flux of water evaporation could be 5 to 15 times larger than the sensible heat flux. The effects of the magnitude of the solar incident flux, the atmospheric humidity, the atmospheric temperature, the absorbing plate tilt angle, and water film thickness on the temperature rising of the water film were clarified in numerical quantities. The increase of the solar incident flux, the atmospheric humidity or the atmospheric temperature also resulted in a rise in the energy absorptance of the collector. en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=SongBaoyin kn-aut-sei=Song kn-aut-mei=Baoyin aut-affil-num=1 ORCID= en-aut-name=InabaHideo en-aut-sei=Inaba en-aut-mei=Hideo kn-aut-name=稲葉英男 kn-aut-sei=稲葉 kn-aut-mei=英男 aut-affil-num=2 ORCID= en-aut-name=HoribeAkihiko en-aut-sei=Horibe en-aut-mei=Akihiko kn-aut-name=堀部明彦 kn-aut-sei=堀部 kn-aut-mei=明彦 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Department of Mechanical Engineering affil-num=2 en-affil= kn-affil=Department of Mechanical Engineering affil-num=3 en-affil= kn-affil=Department of Mechanical Engineering END start-ver=1.4 cd-journal=joma no-vol=32 cd-vols= no-issue=1-2 article-no= start-page=43 end-page=54 dt-received= dt-revised= dt-accepted= dt-pub-year=1998 dt-pub=19980420 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Numerical Analysis of a Model for Isolated Hydrogen Bond en-subtitle= kn-subtitle= en-abstract= kn-abstract=Large isotope effects have been observed in various kinds of hydrogen bonded ferro / antiferroelectrics. In clariflying their origin, themodynamic properties of the hydrogen bond are of essential importance. Two numerical methods are applied to analyze the model for isolated hydrogen bond at finite temperatures and the results of excited energy levels of proton or deuteron are examined. It is found that the second excited state is not far enough from the first excited state to be neglected discussing themodynamic properties of hydrogen especially in their ordered states. en-copyright= kn-copyright= en-aut-name=TotsujiChieko en-aut-sei=Totsuji en-aut-mei=Chieko kn-aut-name=東辻千枝子 kn-aut-sei=東辻 kn-aut-mei=千枝子 aut-affil-num=1 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=MatsubaraTakeo kn-aut-sei=Matsubara kn-aut-mei=Takeo aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=Department of Electrical and Electronic Engineering affil-num=2 en-affil= kn-affil=Institute for Condensed Matter Theory END start-ver=1.4 cd-journal=joma no-vol=33 cd-vols= no-issue=1 article-no= start-page=5 end-page=17 dt-received= dt-revised= dt-accepted= dt-pub-year=1998 dt-pub=19981130 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Rigid-Plastic Deformation of Inhomogeneous Material with Elliptic Inclusions Sliding along Boundary en-subtitle= kn-subtitle= en-abstract= kn-abstract=The influence of the slip between the inclusion and the matrix during the plastic deformation of inhomogeneous material with elliptic inclusions is investigated. The material is assumed to be rigid-plastic. The boundary slip region is modeled by assuming lower yield stress for the thin boundary region than those of the inclusion and the matrix. The rigid-plastic finite element method is used for the numerical calculation under the plane strain condition. The effects of the aspect ratio of the inclusion, the yield stress of the boundary region, and the volume fraction of the inclusion on the deformation mode are studied. The patterns of the strain concentration and the averaged flow stress of the inhomogeneous material are also discussed. The results may be helpful for understanding creep or superplastic deformation of metals with inclusions. en-copyright= kn-copyright= en-aut-name=AbeTakeji en-aut-sei=Abe en-aut-mei=Takeji kn-aut-name=阿部武治 kn-aut-sei=阿部 kn-aut-mei=武治 aut-affil-num=1 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=NamikoshiRyuji kn-aut-sei=Namikoshi kn-aut-mei=Ryuji aut-affil-num=2 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=NagayamaNoriyuki kn-aut-sei=Nagayama kn-aut-mei=Noriyuki aut-affil-num=3 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=TakanoYasuju kn-aut-sei=Takano kn-aut-mei=Yasuju aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=Department of Mechanical Engineering and Cooperative Research Center, Okayama University affil-num=2 en-affil= kn-affil=Shikoku Instrumentation Co., Ltd. affil-num=3 en-affil= kn-affil=Industrial Technology Center of Okayama Prefecture affil-num=4 en-affil= kn-affil=Kobe Steel, Ltd. en-keyword=Plasticity kn-keyword=Plasticity en-keyword=Composite Material kn-keyword=Composite Material en-keyword=Sliding Inclusions kn-keyword=Sliding Inclusions en-keyword=Rigid-Plastic Deformation kn-keyword=Rigid-Plastic Deformation en-keyword=Finite Element Method kn-keyword=Finite Element Method END start-ver=1.4 cd-journal=joma no-vol=43 cd-vols= no-issue= article-no= start-page=49 end-page=54 dt-received= dt-revised= dt-accepted= dt-pub-year=2009 dt-pub=200901 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Position Control of 2-Link SCARA Robot by using InternalModel Control en-subtitle= kn-subtitle= en-abstract= kn-abstract=In this paper, the controlled target is the SCARA robot with two links, and the object is fine control of the arm head position of the robot. To attain the object, Internal Model Control (IMC) is introduced. A nonlinear equations are for robot dynamics formulated by solving Lagrange equation, and is linearized to design control system by IMC. The controller of IMC is designed or synthesisted as the inverse system of the linearized model, and IMC filter model is selected. Also, reference filter is introduced to make the improvement of performance. The result of control performance by IMC is compared with that of PID numerically, accuracy and incoherency are confirmed. en-copyright= kn-copyright= en-aut-name=AkamatsuShinya en-aut-sei=Akamatsu en-aut-mei=Shinya kn-aut-name=赤松慎也 kn-aut-sei=赤松 kn-aut-mei=慎也 aut-affil-num=1 ORCID= en-aut-name=KonishiMasami en-aut-sei=Konishi en-aut-mei=Masami kn-aut-name=小西正躬 kn-aut-sei=小西 kn-aut-mei=正躬 aut-affil-num=2 ORCID= en-aut-name=ImaiJun en-aut-sei=Imai en-aut-mei=Jun kn-aut-name=今井純 kn-aut-sei=今井 kn-aut-mei=純 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Division of Electronic and Information System Engineering Graduate School of Natural Science and Technology Okayama University affil-num=2 en-affil= kn-affil=Division of Industrial Innovation Science Graduate School of Natural Science and Technology Okayama University affil-num=3 en-affil= kn-affil=Division of Industrial Innovation Science Graduate School of Natural Science and Technology Okayama University END start-ver=1.4 cd-journal=joma no-vol=21 cd-vols= no-issue=2 article-no= start-page=31 end-page=45 dt-received= dt-revised= dt-accepted= dt-pub-year=1987 dt-pub=19870305 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Some Remarks on Finite Element Mesh Modeling of Crack-Tip Area en-subtitle= kn-subtitle= en-abstract= kn-abstract=The aim of this paper is to present some remarks on the arrangement of finte element mesh modeling of the area adjacent to the crack-tip which locates in two-dimensional area. Since the stress distribution near crack-tip is singular, the arrangement of mesh pattern and the selection of mesh type in the crack area govern the accuracy of the solution. This paper gives some informations on the arrangement of finite elements in the area which are obtained through numerous number of numerical experiments. And the effectivity of Zooming Technique for stress analysis is clarified through the experiments. en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=TaniguchiTakeo kn-aut-sei=Taniguchi kn-aut-mei=Takeo aut-affil-num=1 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=SanadaKenji kn-aut-sei=Sanada kn-aut-mei=Kenji aut-affil-num=2 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=MatsumotoHajime kn-aut-sei=Matsumoto kn-aut-mei=Hajime aut-affil-num=3 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=MoriwakiKiyoaki kn-aut-sei=Moriwaki kn-aut-mei=Kiyoaki aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=Department of Civil Engineering affil-num=2 en-affil= kn-affil=Department of Civil Engineering affil-num=3 en-affil= kn-affil=Department of Civil Engineering affil-num=4 en-affil= kn-affil=Department of Civil Engineering END start-ver=1.4 cd-journal=joma no-vol=16 cd-vols= no-issue=2 article-no= start-page=89 end-page=99 dt-received= dt-revised= dt-accepted= dt-pub-year=1982 dt-pub=19820329 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Finite Element Analysis of Salt Water Intrusion in Nonsteady Seepage en-subtitle= kn-subtitle= en-abstract= kn-abstract=In this paper are described on the finite element analysis of the nonsteady behavior of interface between salt- and freshwater in coastal groundwater. In order to investigate the validity and the accuracy of this numerical analysis solution, the results calculated by this finite element analysis have been compared with the laboratory model tests. The numerical results showed the very good agreement with the experimental data. Moreover, some applications of this analytical method have been performed. en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=KohnoIichiro kn-aut-sei=Kohno kn-aut-mei=Iichiro aut-affil-num=1 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=NishigakiMakoto kn-aut-sei=Nishigaki kn-aut-mei=Makoto aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=Department of Civil Engineering affil-num=2 en-affil= kn-affil=Department of Civil Engineering END start-ver=1.4 cd-journal=joma no-vol=15 cd-vols= no-issue=2 article-no= start-page=133 end-page=146 dt-received= dt-revised= dt-accepted= dt-pub-year=1981 dt-pub=19810330 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Dissection Method for a Regular Finite Element Mesh en-subtitle= kn-subtitle= en-abstract= kn-abstract=From the theoretical approach to the fill-in minimization problem we present one of the optimal vertex elimination process for a regular finite element mesh M (nxn), and through a number of numerical experiments it is verified that the new process model can always lead to better numerical results comparing to other methods presently in use. Since the process here presented cann't give the actual dissections of M but can clarify how the optimal elimination is, the process includes George's Nested Dissection Method and the method by Duff, Erisman and Reid. By this investigation we can conclude that l) the concept of "Dissection" is neccessary for minimizing the number of fill-ins, 2) the location of the dissection lines can be systematically decided even if n of M is odd or even number, and though the interior area of M is dissected as George's Method, the surrounding area of M is rather irregularily dissected, and 3) the model of the vertex elimination process given in this paper is applied to other kind of regular finite element mesh or finite difference mesh, too. en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=MoriChuji kn-aut-sei=Mori kn-aut-mei=Chuji aut-affil-num=1 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=TaniguchiTakeo kn-aut-sei=Taniguchi kn-aut-mei=Takeo aut-affil-num=2 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=KimotoTeruyuki kn-aut-sei=Kimoto kn-aut-mei=Teruyuki aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Department of Civil Engineering affil-num=2 en-affil= kn-affil=Department of Civil Engineering affil-num=3 en-affil= kn-affil=Department of Civil Engineering END start-ver=1.4 cd-journal=joma no-vol=15 cd-vols= no-issue=1 article-no= start-page=101 end-page=110 dt-received= dt-revised= dt-accepted= dt-pub-year=1980 dt-pub=19801129 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Fundamental Study of the Fill-in Minimization Problem en-subtitle= kn-subtitle= en-abstract= kn-abstract=In this paper the fill-in minimization problem which arises at the application of the sparse matrix method for a large sparse set of linear equations is discussed from the graph-theoretic viewpoint and also through the numerical experiments. Therefore, this investigation consists of two parts, and in the former part the author shows, at first, that the elimination process of a sparse matrix is equivalently replaced to the vertex eliminations for a graph obtained from the matrix, and by use of some concepts in the theory of graph he proves that the vertex elimination process for the minimum fill-in is equivalent to the vertex eliminations for vertices in each subgraph which is obtained by the appropriate dissection of whole graph, and that there are only two types of vertex eliminations through the process. This results in the proposal of a new model of the vertex elimination process. The latter part of this investigation is used for the verification of the results from the theoretic investigation. Through the numerical experiments he concludes that the new model of the vertex elimination process is valid, at least, for a graph like a regular finite element mesh. Furthermore, he shows that this model coincides with Nested Dissection Method which can give the minimum value of fill-in, at present. en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=TaniguchiTakeo kn-aut-sei=Taniguchi kn-aut-mei=Takeo aut-affil-num=1 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=NumataKatsu kn-aut-sei=Numata kn-aut-mei=Katsu aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=Department of Civil Engineering affil-num=2 en-affil= kn-affil=Tomoegumi Steel Works Co., LTD. END start-ver=1.4 cd-journal=joma no-vol=14 cd-vols= no-issue=1 article-no= start-page=95 end-page=126 dt-received= dt-revised= dt-accepted= dt-pub-year=1979 dt-pub=19791201 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Transient Flow in Groundwater to Wells in Island Model Aquifer en-subtitle= kn-subtitle= en-abstract= kn-abstract=In order to apply the numerical method to practical groundwater flow problem in the field, the hydraulic properties must be estimated. In this paper, new methods of analyzing drawdown tests were developed and illustrated with some examples to determine hydraulic properties of aquifer. Drawdown tests sometimes have to be performed near the boundary of the aquifer or in the much groundwater supplied aquifer. In such instances, the assumption that the aquifer is of infinite areal extent is no longer valid. Therefore the analytical solutions of unsteady flow due to drawdown test are derived in the conception of "Island Model" that the shape of groundwater level is fixed by the circular water supply which is equilibrium with the pumping rate. By using these solutions, new methods of analyzing drawdown tests which are performed in a confined aquifer and an unconfined aquifer were given respectively and the effect of influence region was evaluated. The example analysis to determine permeability and storage coefficient were shown. As the results,the propriety of the solutions is verified comparing the analytical results with the drawdown test data taken from a real aquifer project. en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=NishigakiMakoto kn-aut-sei=Nishigaki kn-aut-mei=Makoto aut-affil-num=1 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=KonoIichiro kn-aut-sei=Kono kn-aut-mei=Iichiro aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=Depertment of Civil Engineering affil-num=2 en-affil= kn-affil=Depertment of Civil Engineering END start-ver=1.4 cd-journal=joma no-vol=14 cd-vols= no-issue=1 article-no= start-page=61 end-page=94 dt-received= dt-revised= dt-accepted= dt-pub-year=1979 dt-pub=19791201 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Application of Fininite Element Analysis to Groundwater Flow in Field Problems en-subtitle= kn-subtitle= en-abstract= kn-abstract=The purposes of this paper are primarily to research on behavior of groundwater flow in saturated and unsaturated zone and to develop the most effective methods for solving groundwater flow problems related to civil engineering practice. The mathematical model provides a finite element solution to two- or threedimensional problems involving transient flow in the saturated and unsaturated domains of nonhomogeneous, anisotropic porous media. Before progressing into the various levels of applications the input data and boundary conditions are discussed and evaluated. To demonstrate the flexibility of the finite element approach and its capability in treating complex situations which are often encountered in the field, the groundwater flow through sand bank at flood water levels and the flow through aquifer due to an excavation were analyzed. As the results there were good qualitative agreements between the numerical results and the informations received. en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=KonoIichiro kn-aut-sei=Kono kn-aut-mei=Iichiro aut-affil-num=1 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=NishigakiMakoto kn-aut-sei=Nishigaki kn-aut-mei=Makoto aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=Depertment of Civil Engineering affil-num=2 en-affil= kn-affil=Depertment of Civil Engineering END start-ver=1.4 cd-journal=joma no-vol=1 cd-vols= no-issue=1 article-no= start-page=116 end-page=119 dt-received= dt-revised= dt-accepted= dt-pub-year=1966 dt-pub=19660331 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Identification of Chemical Reaction Process en-subtitle= kn-subtitle= en-abstract= kn-abstract=The identification or model building of system is the important problem for the dynamic optimization of chemical plant and it is desired that this mathematical model can be determined as quickly and as exactly as possible from experimental or operating data. Recently the identification of linear system has been studied, but there have been few papers on nonlinear systems. Especially, no approaches can be found to identify effectively a chemical reaction process which is a nonlinear and nonisothermal system. Except for the case in which the linearized model is enough to represent the approximate dynamic behaviour of the plant, system should be directly represented by nonlinear mathematical model in general. In this paper, the gradient method was applied to identify a nonlinear system. In this method, the parameters to be chosen optimally are regarded as timeinvariant control variables and they are numerically determined by using a high speed digital computer (KDC-I). As a numerical example, we choose a continuous stirred tank reactor with the first order exothermic reaction and show the procedure to determine the three parameters, that is, the order of reaction, the values of activation energy and frequency factor. It should be emphasized that this approach makes it possible to construct the mathematical model of nonisothermal chemical reaction processes only from input and output data. en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=TakamatsuTakeichiro kn-aut-sei=Takamatsu kn-aut-mei=Takeichiro aut-affil-num=1 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=SayamaHayatoshi kn-aut-sei=Sayama kn-aut-mei=Hayatoshi aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=Faculty of Engineering, Kyoto University affil-num=2 en-affil= kn-affil=Dapartment of Industrial Science END start-ver=1.4 cd-journal=joma no-vol=1 cd-vols= no-issue=1 article-no= start-page=110 end-page=115 dt-received= dt-revised= dt-accepted= dt-pub-year=1966 dt-pub=19660331 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Optimizing Control of a Batch Reaction Process en-subtitle= kn-subtitle= en-abstract= kn-abstract=The batch chemical reaction is chosen as the process model to be optimized and the rate constants are functions of pressure only, as the reactions are assumed to occur isothermally. The time optimal control problem considered here means to determine the minimum time path from the given initial compositions to desired final compositions by manipulating the process pressure. A gradient method or a steepest-ascent method is applied to determine the control variable program by using the high speed digital computer. Numerical solutions are presented for the following three cases: (1) no constraint on the operating pressure ...... open and matched terminal constraint. (2) constraint on the operating pressure ...... open terminal constraint. (3) constant operating pressure ...... open terminal constraint. en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=TakamatsuTakeiciro kn-aut-sei=Takamatsu kn-aut-mei=Takeiciro aut-affil-num=1 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=SayamaHayatoshi kn-aut-sei=Sayama kn-aut-mei=Hayatoshi aut-affil-num=2 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=TonoikeTakao kn-aut-sei=Tonoike kn-aut-mei=Takao aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Faculty of Engineering, Kyoto University affil-num=2 en-affil= kn-affil=Dapartment of Industrial Science affil-num=3 en-affil= kn-affil=Central Research Institute, Chisso Co. END start-ver=1.4 cd-journal=joma no-vol=25 cd-vols= no-issue=2 article-no= start-page=25 end-page=38 dt-received= dt-revised= dt-accepted= dt-pub-year=1991 dt-pub=19910328 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Numerical Calculation of a Transient Methane Gas Jet Discharging into Quiescent Atmosphere at Mach One en-subtitle= kn-subtitle= en-abstract= kn-abstract=A suddenly started cold methane gas jet issuing from a 1 mm diameter orifice into still air at Mach one has been predicted using the two-equation, high Reynolds number version of k-ε turbulence model and SIMPLE algorithm which employs so called primitive variables and a hybrid scheme for treating combined diffusion and convection. Global trends of predicted radial distributions of velocity, temperature, methane concentration in the steady rear part of the transient jet and axial jet tip penetration compare reasonably well with universal profiles representing measurement for the steady jet particularly in the fully developed turbulent core and semi-empirical relation for the transient jet respectively. The prediction scheme has shown reasonably good accuracy especially in prediction of main flow parameters of a transient, high speed compressible gas jet issuing into a dissimilar surrounding gas(binary gas mixture jet). en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=NsungeFelix Chintu kn-aut-sei=Nsunge kn-aut-mei=Felix Chintu aut-affil-num=1 ORCID= en-aut-name=TomiｔaEiji en-aut-sei=Tomiｔa en-aut-mei=Eiji kn-aut-name=冨田栄二 kn-aut-sei=冨田 kn-aut-mei=栄二 aut-affil-num=2 ORCID= en-aut-name=HamamotoYoshisuke en-aut-sei=Hamamoto en-aut-mei=Yoshisuke kn-aut-name=浜本嘉輔 kn-aut-sei=浜本 kn-aut-mei=嘉輔 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Graduate School of Natural Science and Technology affil-num=2 en-affil= kn-affil=Dept. of Mechanical Engineering affil-num=3 en-affil= kn-affil=Dept. of Mechanical Engineering END start-ver=1.4 cd-journal=joma no-vol=24 cd-vols= no-issue=1 article-no= start-page=135 end-page=152 dt-received= dt-revised= dt-accepted= dt-pub-year=1989 dt-pub=19891129 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Numerical Simulation of Multicrack Propagation Behaviour in Steel Structure en-subtitle= kn-subtitle= en-abstract= kn-abstract=This paper describes the numerical simulation method of the multi-crack propagation behaviour which appear in a part of civil engineering structures with complex geometrical configuration like steel bridges. Proposed method can treat the interaction of several cracks which locate in a short distance each other, and the process of their growth can be grasped. The method is based on the finite element method, and the linear fracture mechanics is assumed. Proposed method includes following tools for the simulation of the crack propagation behaviour: Automatic Mesh Generators for 3-D, 2-D structural analysis, and 2-D crack propagation analysis, Multi-level Structural Analysis Technique, Estimation Method of the crack growth and the angle of cracks and the modelling method of traffic loadings. The validity of the method is investigated by comparing the result to the experimental one. en-copyright= kn-copyright= en-aut-name=TaniguhiTakeo en-aut-sei=Taniguhi en-aut-mei=Takeo kn-aut-name=谷口健男 kn-aut-sei=谷口 kn-aut-mei=健男 aut-affil-num=1 ORCID= en-aut-name=SuetsuguTsuyoshi en-aut-sei=Suetsugu en-aut-mei=Tsuyoshi kn-aut-name=末次剛 kn-aut-sei=末次 kn-aut-mei=剛 aut-affil-num=2 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=IwasakiMasaki kn-aut-sei=Iwasaki kn-aut-mei=Masaki aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Department of Engineering Science affil-num=2 en-affil= kn-affil=Department of Civil Engineering affil-num=3 en-affil= kn-affil=Yokogawa Bridge Works, LTD. END start-ver=1.4 cd-journal=joma no-vol=28 cd-vols= no-issue=1 article-no= start-page=71 end-page=85 dt-received= dt-revised= dt-accepted= dt-pub-year=1993 dt-pub=19931130 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Numerical Analysis of Salt Intrusion into Aquifer by Eulerian Lagrangian Finite Element Method en-subtitle= kn-subtitle= en-abstract= kn-abstract=In this paper, method of Eulerian Lagrangian numerical analysis is used to described Advection-Dispersion phenomena. The influence of concentration to the density of fluid is considered. A laboratory model of a two dimensional confined aquifer containing an isotropic, homogeneous porous medium (Hosokawa et.al 1989) was used to validate the applicability of Advection-Dispersion of numerical analysis with steady and unsteady state condition [1]. en-copyright= kn-copyright= en-aut-name=NishigakiMakoto en-aut-sei=Nishigaki en-aut-mei=Makoto kn-aut-name=西垣誠 kn-aut-sei=西垣 kn-aut-mei=誠 aut-affil-num=1 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=SudindaTeddy kn-aut-sei=Sudinda kn-aut-mei=Teddy aut-affil-num=2 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=HishiyaTomoyuki kn-aut-sei=Hishiya kn-aut-mei=Tomoyuki aut-affil-num=3 ORCID= en-aut-name=KohnoIichiro en-aut-sei=Kohno en-aut-mei=Iichiro kn-aut-name=河野伊一郎 kn-aut-sei=河野 kn-aut-mei=伊一郎 aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=Department of Civil Engineering affil-num=2 en-affil= kn-affil=Graduate Student in Department of Civil Engineering affil-num=3 en-affil= kn-affil=D I A Consultant affil-num=4 en-affil= kn-affil=Department of Civil Engineering END start-ver=1.4 cd-journal=joma no-vol=26 cd-vols= no-issue=1 article-no= start-page=75 end-page=94 dt-received= dt-revised= dt-accepted= dt-pub-year=1991 dt-pub=19911130 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Urban Expressway Pricing under Constraint en-subtitle= kn-subtitle= en-abstract= kn-abstract=Four radials-single ring urban expressway network is priced and, simultaneously, optimized in its spatial formation under the constraint that a balance must be kept of revenue and expenditure. The model consists of three sub-models: road system, car trip generation-attraction and traffic diversion. Network performance is assessed on two criteria; trip number criterion on which the aggregate number of car trips diverted onto expressway is maximized and travel hour criterion on which the travel hours of car trips integrated over the road system; surface and expressway, is minimized. Optimization is tried by numerical calculation for some sets of parameters in the model. The results are summarized as follows; (1) simultaneous optimization of price and spatial formation of the expressway network is possible on each of criteria, (2) trip number criterion produces lower pricing and smaller network while travel hour criterion does higher pricing and larger network, (3) optimum solution lies in a delicate relation of price and spatial network formation that comes from the balance constraint. en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=MyojinSho kn-aut-sei=Myojin kn-aut-mei=Sho aut-affil-num=1 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=NoguchiHisahumi kn-aut-sei=Noguchi kn-aut-mei=Hisahumi aut-affil-num=2 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=YamadaMasahito kn-aut-sei=Yamada kn-aut-mei=Masahito aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Department of Civil Engineering affil-num=2 en-affil= kn-affil=Daiwa Housing Co. affil-num=3 en-affil= kn-affil=Department of Civil Engineering END start-ver=1.4 cd-journal=joma no-vol=26 cd-vols= no-issue=1 article-no= start-page=21 end-page=26 dt-received= dt-revised= dt-accepted= dt-pub-year=1991 dt-pub=19911130 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Facilitated Diffusion of Carbon-Dioxide in a Living Body Liquid Film en-subtitle= kn-subtitle= en-abstract= kn-abstract=A numerical study is performed for the facilitated diffusion of carbon-dioxide in an ultrapure water film flowing downward along a vertical surface. The model adopted for the present work includes the effects of the reaction rate for the hydration of CO(2)in a liquid. Comparison of the total concentration of CO(2) for different film thickness indicates that the effects of the hydration is more remarkable for the thinner liquid film. en-copyright= kn-copyright= en-aut-name=NozuShigeru en-aut-sei=Nozu en-aut-mei=Shigeru kn-aut-name=野津滋 kn-aut-sei=野津 kn-aut-mei=滋 aut-affil-num=1 ORCID= en-aut-name=InabaHideo en-aut-sei=Inaba en-aut-mei=Hideo kn-aut-name=稲葉英男 kn-aut-sei=稲葉 kn-aut-mei=英男 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=Department of Mechanical Engineering affil-num=2 en-affil= kn-affil=Department of Mechanical Engineering END start-ver=1.4 cd-journal=joma no-vol=27 cd-vols= no-issue=2 article-no= start-page=19 end-page=40 dt-received= dt-revised= dt-accepted= dt-pub-year=1993 dt-pub=19930325 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Complex Dynamics and Search in A Cycle-Memory Neural Network en-subtitle= kn-subtitle= en-abstract= kn-abstract=Numerical simulations of a single layer recurrent neural network model in which the synaptic connection matrix is formed by summing cyclic products of succesive patterns show that complex dynamics can occur with the reduction of a connectivity parameter which is the number of connection between neurons. The structure in these dynamics is discussed from the viewpoint of realizing complex function using complex dynamics. en-copyright= kn-copyright= en-aut-name=NaraShigetoshi en-aut-sei=Nara en-aut-mei=Shigetoshi kn-aut-name=奈良重俊 kn-aut-sei=奈良 kn-aut-mei=重俊 aut-affil-num=1 ORCID= en-aut-name=TotsujiHiroo en-aut-sei=Totsuji en-aut-mei=Hiroo kn-aut-name=東辻浩夫 kn-aut-sei=東辻 kn-aut-mei=浩夫 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=Department of ElectricaJ and Electronic Engineering affil-num=2 en-affil= kn-affil=Department of ElectricaJ and Electronic Engineering END start-ver=1.4 cd-journal=joma no-vol=27 cd-vols= no-issue=1 article-no= start-page=65 end-page=79 dt-received= dt-revised= dt-accepted= dt-pub-year=1992 dt-pub=19921125 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Electronic States and Electron Wave Transfer in Coupled Quantum Wires and Its Control by Externally Applied Electric Field en-subtitle= kn-subtitle= en-abstract= kn-abstract=Quantum mechnical electron wave transfer between two quantum wires which are weakly coupled via a thin potential barrier is considered. The total electronic states are calculated with both analytical ( no field case ) and numerical methods ( under applied electric fields ). The transfer efficiency is evaluated for several specified cases of geometrical structures, potential barrier heights and the externally applied electric field. Estimated trasfer time is of the order of one picosecond in typical mesoscopic structures. The model in this paper can be used to determine important structure parameters for experiments on electron directional coupler controled by external elctric field. en-copyright= kn-copyright= en-aut-name=NaraShigetoshi en-aut-sei=Nara en-aut-mei=Shigetoshi kn-aut-name=奈良重俊 kn-aut-sei=奈良 kn-aut-mei=重俊 aut-affil-num=1 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=HaraYuji kn-aut-sei=Hara kn-aut-mei=Yuji aut-affil-num=2 ORCID= en-aut-name=TotsujiHiroo en-aut-sei=Totsuji en-aut-mei=Hiroo kn-aut-name=東辻浩夫 kn-aut-sei=東辻 kn-aut-mei=浩夫 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Department of Electrical and Electronic Engineering affil-num=2 en-affil= kn-affil=Sharp Corporation affil-num=3 en-affil= kn-affil=Department of Electrical and Electronic Engineering END start-ver=1.4 cd-journal=joma no-vol=30 cd-vols= no-issue=1 article-no= start-page=25 end-page=33 dt-received= dt-revised= dt-accepted= dt-pub-year=1995 dt-pub=19951228 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Identification of Electric Charge Distribution Using Dual Reciprocity Boundary Element Models en-subtitle= kn-subtitle= en-abstract= kn-abstract=Identification of unknown electric charges or sources distributed in space is made from the data observed over the field boundary using dual reciprocity boundary element models. The inhomogeneous term of the Poisson field can equivalently be expressed as the linear combination of the functions associated with the particular solutions to transform into Laplace equation. For the solution procedure, the variational formulation is employed, in which the regular boundary integral approach is incorporated to avoid the singularity. Numerical examples are presented to demonstrate the availability and the capability. en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=SunYonghao kn-aut-sei=Sun kn-aut-mei=Yonghao aut-affil-num=1 ORCID= en-aut-name=KagawaYukio en-aut-sei=Kagawa en-aut-mei=Yukio kn-aut-name=加川幸雄 kn-aut-sei=加川 kn-aut-mei=幸雄 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=Department of Electrical and Electronic Engineering affil-num=2 en-affil= kn-affil=Department of Electrical and Electronic Engineering END start-ver=1.4 cd-journal=joma no-vol=13 cd-vols= no-issue=1 article-no= start-page=7 end-page=15 dt-received= dt-revised= dt-accepted= dt-pub-year=2002 dt-pub=20021225 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Recent trend of research on the adaptive response induced by low dose radiation and its significance kn-title=低線量放射線の適応応答に関する最近の研究動向とその意義 en-subtitle= kn-subtitle= en-abstract=We reviewed the recent trend of research on the adaptive response induced by low dose radiation and its significance. The following view were obtained. Risk assessment is fundamental to the protection of public health from radiation exposure, but any estimate of risk is subject to numerous major uncertainties. In view of the uncertainties surrounding the shape of dose-response curves at low doses of ionizing radiation. the linear nonthreshold dose-response model is now widely accepted as a paradigm in radiation protection practice and risk analysis. However, interest among scientists in obtaining a more conclusive understanding of the effects of low dose radiation has been evident in recent initiatives, such as adaptive response of low dose radiation, in part to help verify or disprove the linear model. A vigorous worldwide effort is now apparently underway to understand the basic mechanisms underlying the biological effects of low dose radiation. This review presents a series of papers representing the progress going on, which will undoubtably make an important contribution to this field of research. kn-abstract=本総説は,低線量放射線に対する生体の適応応答(以下,適応応答)に関してその効果を含む最近の研究動向,さらに放射線防護との関係についてまとめたものである｡特にこの分野で最も検討が進んでいる｢低線量放射線照射の生物学的影響｣に関する国際研究組織(BELLE)での動向を中心に報告するものである｡即ち,ヒトと自然放射線との共存などヒトの生活環境と適応応答について,適応応答の短期的･長期的効果など適応応答の効果とその生物学的意義について言及した｡次に,適応応答の医療などへの応用の可能性について,また,適応応答と放射線防護との関係についても言及した｡ここで,低線量放射線にはヒトへの有益な効果があるとの多くの報告例がある半面,放射線防護の面では微量放射線でも危険とする考え方がその根拠にあることがわかった｡このため,今後は更なる低線量放射線の生体影響研究を進めるとともに,両者の間の隙間をなくす現実的･合理的な対応が求められている｡ en-copyright= kn-copyright= en-aut-name=KusuharaToshimasa en-aut-sei=Kusuhara en-aut-mei=Toshimasa kn-aut-name=楠原俊昌 kn-aut-sei=楠原 kn-aut-mei=俊昌 aut-affil-num=1 ORCID= en-aut-name=HanamotoKatsumi en-aut-sei=Hanamoto en-aut-mei=Katsumi kn-aut-name=花元克巳 kn-aut-sei=花元 kn-aut-mei=克巳 aut-affil-num=2 ORCID= en-aut-name=YamaokaKiyonori en-aut-sei=Yamaoka en-aut-mei=Kiyonori kn-aut-name=山岡聖典 kn-aut-sei=山岡 kn-aut-mei=聖典 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=岡山大学医学部保健学科放射線技術科学専攻 affil-num=2 en-affil= kn-affil=岡山大学医学部保健学科放射線技術科学専攻 affil-num=3 en-affil= kn-affil=岡山大学医学部保健学科放射線技術科学専攻 en-keyword=低線量放射線 (low dose radiation) kn-keyword=低線量放射線 (low dose radiation) en-keyword=低濃度化学物質 (low dose chemicals) kn-keyword=低濃度化学物質 (low dose chemicals) en-keyword=適応応答 (adaptive response) kn-keyword=適応応答 (adaptive response) en-keyword=放射線ホルミシス (radiation hormesis) kn-keyword=放射線ホルミシス (radiation hormesis) en-keyword=放射線防護 (radiation protection) kn-keyword=放射線防護 (radiation protection) END start-ver=1.4 cd-journal=joma no-vol=16 cd-vols= no-issue=1 article-no= start-page=9 end-page=20 dt-received= dt-revised= dt-accepted= dt-pub-year=2005 dt-pub=20051225 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Requiring factors in structural model of the blood vesselfor the principle analysis of measurement of blood pressure waveform by applanation tonometry. kn-title=トノメトリ法による血圧脈波計測原理解析のための血管断面構造モデルに求められる要件 en-subtitle= kn-subtitle= en-abstract="Applanation tonometry" is well known method as the technique which measures blood pressure waveform in vivo non-invasively. Recently, utilizing for screening and prevention diagnosis of circulatory system diseases such as the arteriosclerosis from the blood pressure waveform gotten by this measurement technique is very actively being investigated. However, the sufficient analysis is not carried out on the deformation behavior of the blood vessel in real human body. Consequently, the purpose of this paper is to construct the analyzable numerical model in respect of the applanation tonometry. As this result, following factors are necessary in the numerical analysis model of cross sectional structure of blood vessel for the principle analysis of the blood pressure waveform measurement for applanation tonometry. 1) Sensor block and skin surface must have the independent structure, and it must consider the friction in the contact area. 2) For the quantitative analysis, it is necessary to consider the hyper-elasticity which is a nonlinear material property. In addition, it is necessary to accurately model the initial shapes of the material. kn-abstract=生体内の血圧脈波を非侵襲的に計測する手法として,｢トノメトリ法｣が知られており,近年,この計測手法を用いて得られた血圧脈波波形から,動脈硬化などの循環器系疾患のスクリーニングや予防診断に役立てようという動きが活発である｡しかしながら,組織内の血管を圧迫した場合の血管の変形挙動については,十分な解析は行われていない｡そこで本研究では,生体中のトノメトリ状態を解析可能な数値解析モデルを構築することを目的とした｡この結果, トノメトリ法による血圧脈波計測の原理解析を行うための血管断面構造の応力解析モデルには,以下の要件が求められることが明らかとなった｡・センサ部と皮膚表面はそれぞれ独立な要素としてモデル化し,これらの接触部においては摩擦を考慮しなければならない｡・応力の定量的な解析を行うためには,素材の非線形的な機械的特性を考慮する必要がある｡さらに,実験結果と計算結果を一致させるためには,初期形状を正確にモデル化することが必要であることがわかった｡ en-copyright= kn-copyright= en-aut-name=KitawakiTomoki en-aut-sei=Kitawaki en-aut-mei=Tomoki kn-aut-name=北脇知己 kn-aut-sei=北脇 kn-aut-mei=知己 aut-affil-num=1 ORCID= en-aut-name=OkaHisao en-aut-sei=Oka en-aut-mei=Hisao kn-aut-name=岡久雄 kn-aut-sei=岡 kn-aut-mei=久雄 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=岡山大学医学部保健学科検査技術科学専攻 affil-num=2 en-affil= kn-affil=岡山大学医学部保健学科検査技術科学専攻 en-keyword=トノメトリ法 (Applanation tonometry) kn-keyword=トノメトリ法 (Applanation tonometry) en-keyword=有限要素法 (Finite Element Model) kn-keyword=有限要素法 (Finite Element Model) en-keyword=数値解析モデル (Numerical calculation) kn-keyword=数値解析モデル (Numerical calculation) en-keyword=血圧計測 (Blood pressure measurement) kn-keyword=血圧計測 (Blood pressure measurement) END start-ver=1.4 cd-journal=joma no-vol=31 cd-vols= no-issue=1 article-no= start-page=19 end-page=33 dt-received= dt-revised= dt-accepted= dt-pub-year=1996 dt-pub=19961227 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Structure of Dusty Plasma as Yukawa System Confined in One-Dimensional External Fields en-subtitle= kn-subtitle= en-abstract= kn-abstract=As a model of dusty plasmas in external fields, Yuka.wa system in a one-dimensional external field is analyzed by molecular dynamics simulations and theoretical approaches. It is shown that particles form clear thin layers (sheets) at low temperatures and the number of layers changes discretely with characteristic parameters of the system, accompanying the rearrangements of whole system from nearly equipartitioned layers to also nearly equipartitioned layers. The number, positions and populations of layers are obtained as functions of characteristic parameters. The shell (sheet) model which has been successful for confined one-component plasmas is extended to this system and results of numerical experiments are reproduced to a good accuracy. The effect of cohesive energy in each layer is of essential importance to reproduce discrete changes in the number of sheets. en-copyright= kn-copyright= en-aut-name=TotsujiHiroo en-aut-sei=Totsuji en-aut-mei=Hiroo kn-aut-name=東辻浩夫 kn-aut-sei=東辻 kn-aut-mei=浩夫 aut-affil-num=1 ORCID= en-aut-name=KishimotoTokunari en-aut-sei=Kishimoto en-aut-mei=Tokunari kn-aut-name=岸本篤也 kn-aut-sei=岸本 kn-aut-mei=篤也 aut-affil-num=2 ORCID= en-aut-name=TotsujiChieko en-aut-sei=Totsuji en-aut-mei=Chieko kn-aut-name=東辻千枝子 kn-aut-sei=東辻 kn-aut-mei=千枝子 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Department of Electrical and Electronic Engineering affil-num=2 en-affil= kn-affil=Department of Electrical and Electronic Engineering affil-num=3 en-affil= kn-affil=Department of Electrical and Electronic Engineering END start-ver=1.4 cd-journal=joma no-vol=2008 cd-vols= no-issue=1 article-no= start-page=198 end-page=203 dt-received= dt-revised= dt-accepted= dt-pub-year=2008 dt-pub=20081211 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=A PERISHABLE INVENTORY MODEL WITH UNKNOWN TIME HORIZON en-subtitle= kn-subtitle= en-abstract= kn-abstract=Traditionally, the time (planning) horizon over which the inventory for a particular item will be controlled is often assumed to be known (finite or infinite) and the total inventory cost is usually obtained by summing up the cost over the entire time horizon. However, in some inventory situations the period over which the inventory will be controlled are difficult to predict with certainty, as the inventory problems may not live up to or live beyond the assumed planning horizon, thereby affecting the optimality of the model. This paper presents a deterministic perishable inventory model for items with linear trend in demand and constant deterioration when time horizon is unknown, unspecified or unbounded. The heuristic model obtains replenishment policy by determining the ordering schedule to minimize the total cost per unit time over the duration of each schedule. A numerical example and sensitivity analysis are given to illustrate the model. en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=A.I..ABDUL kn-aut-sei=A.I.. kn-aut-mei=ABDUL aut-affil-num=1 ORCID= en-aut-name=MurataAtsuo en-aut-sei=Murata en-aut-mei=Atsuo kn-aut-name=村田厚生 kn-aut-sei=村田 kn-aut-mei=厚生 aut-affil-num=2 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=A.E.OLULEYE kn-aut-sei=A.E. kn-aut-mei=OLULEYE aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Department of Intelligent Mechanical Systems, Division of Industrial Innovation Sciences affil-num=2 en-affil= kn-affil=Department of Intelligent Mechanical Systems, Division of Industrial Innovation Sciences affil-num=3 en-affil= kn-affil=University of Ibadan END start-ver=1.4 cd-journal=joma no-vol=40 cd-vols= no-issue=1 article-no= start-page=16 end-page=22 dt-received= dt-revised= dt-accepted= dt-pub-year=2006 dt-pub=200601 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=RNN Based Auto-tuning of PID Control Gains in Hot StripLooper Controller en-subtitle= kn-subtitle= en-abstract= kn-abstract=In this study, auto tuning of PID control gains in hot strip looper controller is made based on RNN model. Neuro emulator is employed to model the characteristics of looper dynamics. Combining neuro emulator and RNN model, auto tuning system of PID control gains is constructed. As the inputs to RNN, plural evaluation functions which reflect individual preference of human experts. Further, Self learning mechamism is embeded to RNN model which enables adaptation to the change in rolling chracteristics. Through numerical experiments, the effect of the proposed method is ascertained. en-copyright= kn-copyright= en-aut-name=AbeYoshihiro en-aut-sei=Abe en-aut-mei=Yoshihiro kn-aut-name=阿部快洋 kn-aut-sei=阿部 kn-aut-mei=快洋 aut-affil-num=1 ORCID= en-aut-name=KonishiMasami en-aut-sei=Konishi en-aut-mei=Masami kn-aut-name=小西正躬 kn-aut-sei=小西 kn-aut-mei=正躬 aut-affil-num=2 ORCID= en-aut-name=NishiTatsushi en-aut-sei=Nishi en-aut-mei=Tatsushi kn-aut-name=西竜志 kn-aut-sei=西 kn-aut-mei=竜志 aut-affil-num=3 ORCID= en-aut-name=ImaiJun en-aut-sei=Imai en-aut-mei=Jun kn-aut-name=今井純 kn-aut-sei=今井 kn-aut-mei=純 aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=Dept. of Electrical and Electronic Engineering Okayama University affil-num=2 en-affil= kn-affil=Dept. of Electrical and Electronic Engineering Division of Industrial Innovation Sciences The Graduate School of Natural Science and Technology Okayama University affil-num=3 en-affil= kn-affil=Dept. of Electrical and Electronic Engineering Division of Industrial Innovation Sciences The Graduate School of Natural Science and Technology Okayama University affil-num=4 en-affil= kn-affil=Dept. of Electrical and Electronic Engineering Division of Industrial Innovation Sciences The Graduate School of Natural Science and Technology Okayama University END start-ver=1.4 cd-journal=joma no-vol=41 cd-vols= no-issue=1 article-no= start-page=44 end-page=51 dt-received= dt-revised= dt-accepted= dt-pub-year=2007 dt-pub=200701 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Decomposition of Time Petri Nets for Solving Optimal FiringSequence Problem en-subtitle= kn-subtitle= en-abstract= kn-abstract=Petri net model is a frequently-used versatile tool which can represent a widely discrete event system. However, when the scale of the system becomes large, the calculation time for solving optimal problem (optimal firing sequence problem) is markedly increased. In this paper, we propose an approximation method that achieves the efficiency improvement of the solution by decomposing the Petri net for solving the optimal firing sequence problem. A timed Petri Net is decomposed into several subnets in which the optimal firing sequence for each subnet is solved by Dijkstra’s algorithm in polynomial computational complexity. The effectivity of the proposed method is verified by numerical experiments for the flowshop schedule problem. en-copyright= kn-copyright= en-aut-name=MaenoRyota en-aut-sei=Maeno en-aut-mei=Ryota kn-aut-name=前野良太 kn-aut-sei=前野 kn-aut-mei=良太 aut-affil-num=1 ORCID= en-aut-name=KonishiMasami en-aut-sei=Konishi en-aut-mei=Masami kn-aut-name=小西正躬 kn-aut-sei=小西 kn-aut-mei=正躬 aut-affil-num=2 ORCID= en-aut-name=ImaiJun en-aut-sei=Imai en-aut-mei=Jun kn-aut-name=今井純 kn-aut-sei=今井 kn-aut-mei=純 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Dept. of Electrical and Electronic Engineering The Graduate School of Natural Science and Technology Okayama University affil-num=2 en-affil= kn-affil=Dept. of Electrical and Electronic Engineering The Graduate School of Natural Science and Technology Okayama University affil-num=3 en-affil= kn-affil=Dept. of Electrical and Electronic Engineering The Graduate School of Natural Science and Technology Okayama University END start-ver=1.4 cd-journal=joma no-vol=42 cd-vols= no-issue=1 article-no= start-page=79 end-page=90 dt-received= dt-revised= dt-accepted= dt-pub-year=2008 dt-pub=200801 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Temperature Distribution Control of Reactor Furnace by StateSpace Method using FEM Modeling en-subtitle= kn-subtitle= en-abstract= kn-abstract=The operations of a reactor furnace such as a blast furnace still depend on the experiences and intuitions of skilled operators due to the complexity of internal furnace phenomena and high temperature. There is a great demand for stable operations under the circumstances of a decrease in the number of skilled operators and difficulty in technology inheritance. This paper aims to construct mathematical description for control of a reactor furnace. Further, the linear-quadratic-gaussian control system for a reactor furnace is proposed, which estimates inner furnace temperature distribution using measured data near furnace wall. Temperature distribution of a furnace is controlled based on the estimated inner temperature distribution changing of boundary conditions of a furnace. The practicability of the proposed control method was checked through numerical experiments. en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=NotsuTadafumi kn-aut-sei=Notsu kn-aut-mei=Tadafumi aut-affil-num=1 ORCID= en-aut-name=KonishiMasami en-aut-sei=Konishi en-aut-mei=Masami kn-aut-name=小西正躬 kn-aut-sei=小西 kn-aut-mei=正躬 aut-affil-num=2 ORCID= en-aut-name=ImaiJun en-aut-sei=Imai en-aut-mei=Jun kn-aut-name=今井純 kn-aut-sei=今井 kn-aut-mei=純 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Division of Electronic and Information System Engineering Graduate School of Natural Science and Technology Okayama University affil-num=2 en-affil= kn-affil=Division of Industrial Innovation Science Graduate School of Natural Science and Technology Okayama University affil-num=3 en-affil= kn-affil=Division of Industrial Innovation Science Graduate School of Natural Science and Technology Okayama University END start-ver=1.4 cd-journal=joma no-vol=105 cd-vols= no-issue=5-6 article-no= start-page=455 end-page=464 dt-received= dt-revised= dt-accepted= dt-pub-year=1993 dt-pub=1993 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=On localization of inhaled antigens in late asthmatic response in an animal model kn-title=遅発型気道反応の発現機序に関する基礎的研究―吸入抗原の局在について― en-subtitle= kn-subtitle= en-abstract= kn-abstract=To clarify the initiation of late asthmatic response (LAR), the localization and fate of inhaled antigens were studied using an animal model of LAR. Guinea pigs were sensitized by ascaris suum and aluminum gel. Radioiodinated ascaris suum and ovalbumin as control were subsequently injected into the trachea of the guinea pig to determine the radioactivity of bronchoalveolar lavege (BAL) cells and fluid (BALF) components before and after LAR. The localization of antigens was also examined by autoradiography of BAL cells and lung tissue sections. The radioactivity of radioiodinated ascaris in BAL cells and lung tissue increased during LAR with increases in macrophages and neutrophils, although in non-responding animals inhaled antigens gradualy disappeared from the airway. The radioactivity of radioiodinated ovalbumin gradually decreased regardless of LAR. Autoradiographic study showed that the inhaled antigens were located in the cytoplasm of alveolar macrophages in BALF and lung tissue. These data indicate that inhaled antigens may accumulate and migrate with numerous inflammatory cells such as macrophages and neutrophils in late phase bronchial response. en-copyright= kn-copyright= en-aut-name=TakedaKatsuyuki en-aut-sei=Takeda en-aut-mei=Katsuyuki kn-aut-name=武田勝行 kn-aut-sei=武田 kn-aut-mei=勝行 aut-affil-num=1 ORCID= affil-num=1 en-affil= kn-affil=岡山大学医学部第二内科学教室 en-keyword=alveolar macrophage kn-keyword=alveolar macrophage en-keyword=guinea pig kn-keyword=guinea pig en-keyword=(125)I-ascaris kn-keyword=(125)I-ascaris en-keyword=late asthmatic response (LAR) kn-keyword=late asthmatic response (LAR) en-keyword=localization of inhaled antigen kn-keyword=localization of inhaled antigen END start-ver=1.4 cd-journal=joma no-vol=14 cd-vols= no-issue=1 article-no= start-page=1 end-page=9 dt-received= dt-revised= dt-accepted= dt-pub-year=2008 dt-pub=20080331 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Storm surge in the Seto Inland Sea accompanied by Typhoons in 2004 kn-title=2004年の台風による瀬戸内海の高潮について en-subtitle= kn-subtitle= en-abstract= kn-abstract=In 2004, Seto Inland Sea coast suffered severe damages of storm surge. This area never experienced storm surge damage in recent half century and people were not ready for the storm surge. In two typhoons of T0416 and T0418, surge anomaly were more than 150cm in Bisan-Seto area. Storm surges appeared after the maximum approach of typhoon not only due to surface low pressure but also due to wind stress as westerly. Because of geographical complexity of Seto Inland Sea, the surge process have not been well understood. Therefore, it is necessary to study the effects of the wind and the surface pressure using a numerical model. Atmospheric model MM5 and ocean model POM were used as a numerical experiment, including the astronomical tide model NAO. Aｓ the results of numerical simulation of the storm surge, atmospheric conditions were well simulated but ocean model was rather complex. There are a lot of island in Seto Inland Sea and sea water movement in the model was very much influenced by the topography and wind stress effect appeared much smaller. In the no-island model, storm surge height was a little improved. However the simulated surge height was still less than the observed height. Further improvement of the ocean model application should be considered in future studies. en-copyright= kn-copyright= en-aut-name=AsanumaTomomitsu en-aut-sei=Asanuma en-aut-mei=Tomomitsu kn-aut-name=淺沼友光 kn-aut-sei=淺沼 kn-aut-mei=友光 aut-affil-num=1 ORCID= en-aut-name=TsukamotoOsamu en-aut-sei=Tsukamoto en-aut-mei=Osamu kn-aut-name=塚本修 kn-aut-sei=塚本 kn-aut-mei=修 aut-affil-num=2 ORCID= en-aut-name=OgawaKouji en-aut-sei=Ogawa en-aut-mei=Kouji kn-aut-name=小川貢司 kn-aut-sei=小川 kn-aut-mei=貢司 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=岡山大学大学院自然科学研究科 affil-num=2 en-affil= kn-affil=岡山大学大学院自然科学研究科 affil-num=3 en-affil= kn-affil=岡山理科大学 en-keyword=Typhoon kn-keyword=Typhoon en-keyword=Storm Surge kn-keyword=Storm Surge en-keyword=Seto Inland Sea kn-keyword=Seto Inland Sea en-keyword=surface pressure kn-keyword=surface pressure en-keyword=wind stress kn-keyword=wind stress END start-ver=1.4 cd-journal=joma no-vol=13 cd-vols= no-issue=1 article-no= start-page=63 end-page=66 dt-received= dt-revised= dt-accepted= dt-pub-year=2008 dt-pub=200803 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=State of the Art on Filter Design and Particle Clogging; and Proposed New Numerical Approach to Redesign en-subtitle= kn-subtitle= en-abstract= kn-abstract=Filters are essential in the design of embankments/dams, drains and wells for water and oil supplies. As a result of these functions, filter use is increasing. In order to use the required filter, various empirical relations have been given based on mathematical and field experience. However, these guidelines have not worked to perfection considering the fact that clogging within the filter face is a serious challenge. A short review on filter design criteria is given in this script coupled with a numerical formulation to propose the design limits. en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=Akudago ApambillaJohn kn-aut-sei=Akudago Apambilla kn-aut-mei=John aut-affil-num=1 ORCID= en-aut-name=NishigakiMakoto en-aut-sei=Nishigaki en-aut-mei=Makoto kn-aut-name=西垣誠 kn-aut-sei=西垣 kn-aut-mei=誠 aut-affil-num=2 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=Chegbeleh LarryPax kn-aut-sei=Chegbeleh Larry kn-aut-mei=Pax aut-affil-num=3 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=AlimMd. Abdul kn-aut-sei=Alim kn-aut-mei=Md. Abdul aut-affil-num=4 ORCID= en-aut-name=KomatsuMitsuru en-aut-sei=Komatsu en-aut-mei=Mitsuru kn-aut-name=小松満 kn-aut-sei=小松 kn-aut-mei=満 aut-affil-num=5 ORCID= en-aut-name=KumamaruKoji en-aut-sei=Kumamaru en-aut-mei=Koji kn-aut-name=熊丸耕志 kn-aut-sei=熊丸 kn-aut-mei=耕志 aut-affil-num=6 ORCID= affil-num=1 en-affil= kn-affil=World Vision Ghana Rural Water Project affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=World Vision Ghana Rural Water Project affil-num=4 en-affil= kn-affil=岡山大学 affil-num=5 en-affil= kn-affil=岡山大学 affil-num=6 en-affil= kn-affil=岡山大学 en-keyword=filter kn-keyword=filter en-keyword=particle clogging kn-keyword=particle clogging en-keyword=filter classification kn-keyword=filter classification en-keyword=numerical model equation kn-keyword=numerical model equation en-keyword=force of attraction kn-keyword=force of attraction END start-ver=1.4 cd-journal=joma no-vol=39 cd-vols= no-issue=3 article-no= start-page=23 end-page=42 dt-received= dt-revised= dt-accepted= dt-pub-year=2007 dt-pub=200712 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Evolving Technical Capabilities in Turmoil : A Field Research on The Value Chain Network of Denim Jeans Industry in The Setouchi District (2) kn-title=産地力の持続メカニズムの探求 ～ジーンズ製販ネットワークのフィールド調査（２）～ en-subtitle= kn-subtitle= en-abstract=This paper reports our field research regarding the denim jeans production− distribution network in the Setouchi district. As argued in the previous paper, existing literatures fail to explain why and how the district has achieved technical and commercial sustainability regardless of facing fierce competitive pressures from abroad. We report some facts that the literatures have not fully acknowledged and therefore will lead us to reconstruct the way of seeing how the district works. The behaviors of the players in our research field seem to be more complex than theoretically predicted. A current popular way of explaining industrial agglomerations is the network based approach that can suitably illuminate numerous invisible networks functioning as flexible value chains to respond to the received orders from outside of the district. However, this approach is said to be less powerful when we turn our focus onto the players’ individualistic and innovative behaviors since networks are essentially the human relations through which information and knowledge is collaboratively shared by the players. We believe that people in the district are highly intrinsically motivated, change their business models and hold ambivalent feelings towards the old paradigm where collaborative networks share incoming consumer information, technical knowledge and revenues from the market. We firstly report the history of Japan’s denim jeans industry. Secondly, the competitive structure of the recent market follows. Lastly we focus on the recent entrants into the market who symbolically illuminate the vitality of the district. We will elaborate in our forthcoming paper a possible mechanism underlying the sustainable competitiveness of the district. kn-abstract=本稿の目的は，産地型集積の維持・発展メカニズムの分析に先立つ予備的作業として，三備地区が他の繊維・アパレル産地に比較して産地力の持続に成功していることをフィールド調査を通じて考察することである。これに必要な作業としてまず，デニム・ジーンズの歴史や，ジーンズの消費財としての特殊性，三備地区がジーンズに出会ってから今日に到るまでの大きな流れなどを掴む。また倉敷市児島地区を中心とした製販ネットワークの現状を具体的に報告する。前稿で述べたように，産業集積にアプローチするうえで比較優位説を展開した「ヘクシャー＝オリン定理」を採用するのと並行して，Porter（１９９０a，１９９０b）が前提するようなプレイヤーの自律的行 為能力を重視したいというのが，本研究の立場であった。ヘクシャー＝オリン定理を適用すると，綿花の産地であった三備地区で綿素材を中心とした繊維・アパレル産業が形成されたことを理解しやすいであろうし，時代の変化に応じて企業が戦略的に経営の舵を切る様子に着目し，児島地区を中心とした製販ネットワークを産地型集積の一例として捉えることもまた有意義な作業であろう。ジーンズ産地の持続・発展のメカニズムを考察するとき，さらに一歩踏み込んで既存の産業集積論では説明しきれない部分を探し出し，より包括的な理解を構築したいと考えている。そこで＜実践コミュニティ＞という新しい視座の導入を試みるのだけれども，具体的には，産地内の企業間の切磋琢磨や競争的な試行錯誤が，ジーンズ産地の持続・発展に影響を与えた可能性を探求したいと考えている。ただしその分析作業は，次章以降の課題である。本章では，既存の理論を若干意識しながら，まずデニム・ジーンズや三備地区の簡単な歴史を振り返り，ジーンズ固有の厚地，芯白，綾織といった特性について説明し，三備地区が綿花の産地から紡績，織物，縫製など繊維産地へ発展した流れを追う（第２節）。続いて，企業が戦略的に経営の舵を切っていく「ジーンズ国産化」の流れを追う（第３節）。すなわち他のアパレル製品と比較してデニム・ジーンズの最大の特徴であり，またアメリカのジーンズには本来なかった洗い加工技術を中心にして，三備地区のジーンズ作りに対する取組みを概観する。続いてインタビューを通じて得られた三備地区に関するイメージを報告する。まず集積の主体である企業群を大きく３つの業態に分割し，それらの特徴を理念型として整理し，それぞれのメリットとデメリットを報告する（第４節）。続いて集積メリットのひとつとして，若手経営者の起業を促す要素を考察し，どのような試みが展開されているのかを報告する（第５節）。 en-copyright= kn-copyright= en-aut-name=FujiiDaiji en-aut-sei=Fujii en-aut-mei=Daiji kn-aut-name=藤井大児 kn-aut-sei=藤井 kn-aut-mei=大児 aut-affil-num=1 ORCID= en-aut-name=TomaeHisao en-aut-sei=Tomae en-aut-mei=Hisao kn-aut-name=戸前壽夫 kn-aut-sei=戸前 kn-aut-mei=壽夫 aut-affil-num=2 ORCID= en-aut-name=YamamotoTomoyuki en-aut-sei=Yamamoto en-aut-mei=Tomoyuki kn-aut-name=山本智之 kn-aut-sei=山本 kn-aut-mei=智之 aut-affil-num=3 ORCID= en-aut-name=InoueJiro en-aut-sei=Inoue en-aut-mei=Jiro kn-aut-name=井上治郎 kn-aut-sei=井上 kn-aut-mei=治郎 aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil= affil-num=4 en-affil= kn-affil= END start-ver=1.4 cd-journal=joma no-vol=2 cd-vols= no-issue=1 article-no= start-page=107 end-page=120 dt-received= dt-revised= dt-accepted= dt-pub-year=1997 dt-pub=19970110 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Determination of Crossarm Installation in Fill Dams by Back Analysis en-subtitle= kn-subtitle= en-abstract= kn-abstract=This paper discusses a numerical model that can be used to optimize the installation in a zoned type and a homogeneous type fill dam. Before installation in a real dam to evaluate dam behavior, numerical model described in this paper is carried out on a prototype dam to check the optimum installation, using cross arm measurements. Three cross arm installations at the upstream, the core and downstream to measure displacements are considered. The installation options considered are three cross arm combinations for best installation to verify the safety of dams and to reduce cost. Finite element method is used for generating the displecement field in a linear elastic numerical model. The generated data is used as an input data in the back analysis to check the adequacy of each installation option. en-copyright= kn-copyright= en-aut-name=FujiiHiroaki en-aut-sei=Fujii en-aut-mei=Hiroaki kn-aut-name=藤井弘章 kn-aut-sei=藤井 kn-aut-mei=弘章 aut-affil-num=1 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=OforiEmmanuel kn-aut-sei=Ofori kn-aut-mei=Emmanuel aut-affil-num=2 ORCID= en-aut-name=ShimadaKiyoshi en-aut-sei=Shimada en-aut-mei=Kiyoshi kn-aut-name=島田清 kn-aut-sei=島田 kn-aut-mei=清 aut-affil-num=3 ORCID= en-aut-name=NishimuraShin-ichi en-aut-sei=Nishimura en-aut-mei=Shin-ichi kn-aut-name=西村伸一 kn-aut-sei=西村 kn-aut-mei=伸一 aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 affil-num=4 en-affil= kn-affil=岡山大学 END start-ver=1.4 cd-journal=joma no-vol=1 cd-vols= no-issue=1 article-no= start-page=47 end-page=53 dt-received= dt-revised= dt-accepted= dt-pub-year=1996 dt-pub=199603 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Computational water analysis in an artificial lake: Kojima Lake case en-subtitle= kn-subtitle= en-abstract= kn-abstract=We treat the problem of water pollution by the method of a mathematical model. We illustrate the method of analysis with Kojima Lake. We analyze in-flow and out-flow of the lake, compute numerical solutions of the governing equations of the water flow and the pollutant. The simulation leads to the conclusion concerning the figure of Kojima Lake. en-copyright= kn-copyright= en-aut-name=SasakiToru en-aut-sei=Sasaki en-aut-mei=Toru kn-aut-name=佐々木徹 kn-aut-sei=佐々木 kn-aut-mei=徹 aut-affil-num=1 ORCID= en-aut-name=IshikawaHirofumi en-aut-sei=Ishikawa en-aut-mei=Hirofumi kn-aut-name=石川洋文 kn-aut-sei=石川 kn-aut-mei=洋文 aut-affil-num=2 ORCID= en-aut-name=KajiwaraTsuyoshi en-aut-sei=Kajiwara en-aut-mei=Tsuyoshi kn-aut-name=梶原毅 kn-aut-sei=梶原 kn-aut-mei=毅 aut-affil-num=3 ORCID= en-aut-name=WatanabeMasaji en-aut-sei=Watanabe en-aut-mei=Masaji kn-aut-name=渡辺雅二 kn-aut-sei=渡辺 kn-aut-mei=雅二 aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 affil-num=4 en-affil= kn-affil=岡山大学 en-keyword=Kojima lake kn-keyword=Kojima lake en-keyword=Water analysis kn-keyword=Water analysis en-keyword=Finite element method kn-keyword=Finite element method END start-ver=1.4 cd-journal=joma no-vol=5 cd-vols= no-issue=1 article-no= start-page=99 end-page=105 dt-received= dt-revised= dt-accepted= dt-pub-year=2000 dt-pub=20000229 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=On the use of Delaunay triangulation as 3D finite element modeler en-subtitle= kn-subtitle= en-abstract= kn-abstract=Delaunay triangulation, a geometric subdivision of any convex domain, is often used as a finite element modeling method, but there are still several problems, which originally come from the characteristics of Delaunay triangulation. One problem appears when we remove some nodes which are already introduced for the triangulation. In this case we aim to obtain the triangulation without nodes by partial modification of the Delaunay triangulation with the node. Another problem occurs when tetrahedra with zero volume are generated by Delaunay triangulation. In this case they must be removed for the numerical analysis in order to guarantee the numerical stability and good numerical solutions. In this paper these two problems occuring at the use of Delaunay triangulation are theoretically discussed. en-copyright= kn-copyright= en-aut-name=TaniguchiTakeo en-aut-sei=Taniguchi en-aut-mei=Takeo kn-aut-name=谷口健男 kn-aut-sei=谷口 kn-aut-mei=健男 aut-affil-num=1 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 en-keyword=Delaunay triangulation kn-keyword=Delaunay triangulation en-keyword=Degeneracy kn-keyword=Degeneracy en-keyword=Tetrahedron kn-keyword=Tetrahedron en-keyword=Automatic mesh generation kn-keyword=Automatic mesh generation END start-ver=1.4 cd-journal=joma no-vol=5 cd-vols= no-issue=1 article-no= start-page=35 end-page=46 dt-received= dt-revised= dt-accepted= dt-pub-year=2000 dt-pub=20000229 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Influence Functions in Semivariogram Estimation : A Comparative Study en-subtitle= kn-subtitle= en-abstract= kn-abstract=Spatial data is analyzed in three stages of 1) estimating the variograms, 2) fitting a model for the estimated variograms and 3) predicting the value at unknown location based on the information at known locations (kriging). Recently, it has become a subject of interest to detect influential observations in these stages. Choi and Tanaka(1999) have derived influence functions in the above three stages and have proposed sensitivity analysis procedure. So far influence functions have only been derived for variograms by Gunst and Hartfield(1996). The present article makes a comparison of the performances between those influence functions for variograms derived by Choi and Tanaka(1999) and by Gunst and Hartfield(1996). A real numerical example is given to discuss the validity or usefulness of those influence functions. en-copyright= kn-copyright= en-aut-name=ChoiSeung Bae en-aut-sei=Choi en-aut-mei=Seung Bae kn-aut-name=崔承培 kn-aut-sei=崔 kn-aut-mei=承培 aut-affil-num=1 ORCID= en-aut-name=TanakaYutaka en-aut-sei=Tanaka en-aut-mei=Yutaka kn-aut-name=田中豊 kn-aut-sei=田中 kn-aut-mei=豊 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 en-keyword=Stationary spatal data kn-keyword=Stationary spatal data en-keyword=Influence function kn-keyword=Influence function en-keyword=Sample variogram kn-keyword=Sample variogram en-keyword=Median-polish residual kn-keyword=Median-polish residual END start-ver=1.4 cd-journal=joma no-vol=5 cd-vols= no-issue=1 article-no= start-page=31 end-page=34 dt-received= dt-revised= dt-accepted= dt-pub-year=2000 dt-pub=20000229 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=A Numerical Analysis of Unsteady Flow in Kojima Lake en-subtitle= kn-subtitle= en-abstract= kn-abstract=We study unsteady flow that models lake flow in Kojima Lake. We assume that a lake is connected to another area with gates, and that those gates are opened when the water level outside the gates is lower than the water level of the lake. We study unsteady flow due to the opening of the gates. We analyze the problem with the finite element method, and take detailed structures of the gates into account. en-copyright= kn-copyright= en-aut-name=WatanabeMasaji en-aut-sei=Watanabe en-aut-mei=Masaji kn-aut-name=渡辺雅二 kn-aut-sei=渡辺 kn-aut-mei=雅二 aut-affil-num=1 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 en-keyword=unsteady flow kn-keyword=unsteady flow en-keyword=lake flow kn-keyword=lake flow en-keyword=finite element method kn-keyword=finite element method END start-ver=1.4 cd-journal=joma no-vol=3 cd-vols= no-issue=1 article-no= start-page=11 end-page=24 dt-received= dt-revised= dt-accepted= dt-pub-year=1998 dt-pub=19980114 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=A numerical analysis of slow oscillations in dynamics of coupled systems en-subtitle= kn-subtitle= en-abstract= kn-abstract=We study a system that models a problem in which an oscillatory unit is coupled to a passive medium. We analyze the case in which an RCL circuit is coupled to an RC circuit. Some numerical results indicate when slow oscillations occur in coupled systems. en-copyright= kn-copyright= en-aut-name=WatanabeMasaji en-aut-sei=Watanabe en-aut-mei=Masaji kn-aut-name=渡辺雅二 kn-aut-sei=渡辺 kn-aut-mei=雅二 aut-affil-num=1 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 en-keyword=coupled circuits kn-keyword=coupled circuits en-keyword=Van der Pol's equation kn-keyword=Van der Pol's equation en-keyword=slow oscillations kn-keyword=slow oscillations END start-ver=1.4 cd-journal=joma no-vol=5 cd-vols= no-issue=1 article-no= start-page=13 end-page=21 dt-received= dt-revised= dt-accepted= dt-pub-year=2000 dt-pub=20000229 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Simulations of Heel Impact by Viscoelastic Models kn-title=粘弾性モデルを用いた着地衝撃シミュレーション en-subtitle= kn-subtitle= en-abstract= kn-abstract=The purpose of this study is to make some body models with viscoelastic model, to simulate the heel impact and to obtain the ground reaction force. In this paper, we build up body models of linear viscoelastic elements and mass elements to simulate heel impact. Here we consider the systems of linear differential equations numerically for the preparation of mathematical analysis in future. The simplest model with two mass elements is hardly able to simulate the heel impact if the rate of mass of elements is realistic. The models with more elements are suitable to simulate for actual rate of weight of body segments. The model with three mass elements makes it possible to guess the force to each body segment. en-copyright= kn-copyright= en-aut-name=KokuboMasahito en-aut-sei=Kokubo en-aut-mei=Masahito kn-aut-name=小久保雅仁 kn-aut-sei=小久保 kn-aut-mei=雅仁 aut-affil-num=1 ORCID= en-aut-name=SasakiToru en-aut-sei=Sasaki en-aut-mei=Toru kn-aut-name=佐々木徹 kn-aut-sei=佐々木 kn-aut-mei=徹 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 en-keyword=Running kn-keyword=Running en-keyword=Heel Impact kn-keyword=Heel Impact en-keyword=Viscoelastic Model kn-keyword=Viscoelastic Model en-keyword=Biomechanics kn-keyword=Biomechanics END start-ver=1.4 cd-journal=joma no-vol=6 cd-vols= no-issue=1 article-no= start-page=17 end-page=23 dt-received= dt-revised= dt-accepted= dt-pub-year=2001 dt-pub=20010228 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Speeds of travelling wave solutions in a mathematical model of some infectious disease in predator-prey system kn-title=捕食系の感染症数理モデルにおける進行波解の速度 en-subtitle= kn-subtitle= en-abstract= kn-abstract=In this paper we construct a simple mathematical model for infectious disease in a pradator-prey system, and study the speeds of travelling wave solutions of this model. We present a method of estimation of speeds and make a numerical study about this matter. en-copyright= kn-copyright= en-aut-name=KajiwaraTsuyoshi en-aut-sei=Kajiwara en-aut-mei=Tsuyoshi kn-aut-name=梶原毅 kn-aut-sei=梶原 kn-aut-mei=毅 aut-affil-num=1 ORCID= en-aut-name=OkitaTomoki en-aut-sei=Okita en-aut-mei=Tomoki kn-aut-name=沖田知毅 kn-aut-sei=沖田 kn-aut-mei=知毅 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 en-keyword=Travelling wave kn-keyword=Travelling wave en-keyword=Infectious disease kn-keyword=Infectious disease END start-ver=1.4 cd-journal=joma no-vol=7 cd-vols= no-issue=1 article-no= start-page=23 end-page=29 dt-received= dt-revised= dt-accepted= dt-pub-year=2002 dt-pub=20020322 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Studies on Covariance Selection Models : Stepwise Procedure and Local Influence en-subtitle= kn-subtitle= en-abstract= kn-abstract=Analysis of covariance selection models is a useful multivariate method to analyze the covariance structure of a multivariate normal distribution. It is used to reveal cause-and-effect relationships. In the present paper we review the theory and study numerically how the stepwise procedure of covariance selection works in actual data analysis. Then we try to develop a method of influence analysis in covariance selection, and show a numerical example to illustrate the usefulness of the method of influence analysis. en-copyright= kn-copyright= en-aut-name=SungJiMin en-aut-sei=Sung en-aut-mei=JiMin kn-aut-name=成祉旻 kn-aut-sei=成 kn-aut-mei=祉旻 aut-affil-num=1 ORCID= en-aut-name=YangWooSung en-aut-sei=Yang en-aut-mei=WooSung kn-aut-name=梁祐誠 kn-aut-sei=梁 kn-aut-mei=祐誠 aut-affil-num=2 ORCID= en-aut-name=TanakaYutaka en-aut-sei=Tanaka en-aut-mei=Yutaka kn-aut-name=田中豊 kn-aut-sei=田中 kn-aut-mei=豊 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 en-keyword=Covariance Selection kn-keyword=Covariance Selection en-keyword=Local Influence kn-keyword=Local Influence en-keyword=Influence Function kn-keyword=Influence Function en-keyword=Stepwise Procedure kn-keyword=Stepwise Procedure END start-ver=1.4 cd-journal=joma no-vol=8 cd-vols= no-issue=1 article-no= start-page=19 end-page=22 dt-received= dt-revised= dt-accepted= dt-pub-year=2003 dt-pub=200303 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=A note on the effect of quadratic term on final pattern in Turing model kn-title=チューリングモデルにおける2次の反応項のパターンに与える影響 en-subtitle= kn-subtitle= en-abstract= kn-abstract=The effect of the quadratic term on the final pattern in Turing model is disscussed numerically. Turing models are non linear reaction diffusion equations. Linear analysis for wave length is very useful to find evolving waves. But when a quadratic term appear in the equation, an initial wave can disappears and changes drastically to a spot which is independent of linear analysis. en-copyright= kn-copyright= en-aut-name=YamauchiKen-ichi en-aut-sei=Yamauchi en-aut-mei=Ken-ichi kn-aut-name=山内憲一 kn-aut-sei=山内 kn-aut-mei=憲一 aut-affil-num=1 ORCID= en-aut-name=KajiwaraTsuyoshi en-aut-sei=Kajiwara en-aut-mei=Tsuyoshi kn-aut-name=梶原毅 kn-aut-sei=梶原 kn-aut-mei=毅 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 en-keyword=Turing instability kn-keyword=Turing instability en-keyword=Reaction Diffusion equation kn-keyword=Reaction Diffusion equation en-keyword=Quadratic term kn-keyword=Quadratic term END start-ver=1.4 cd-journal=joma no-vol=9 cd-vols= no-issue=1 article-no= start-page=37 end-page=44 dt-received= dt-revised= dt-accepted= dt-pub-year=2004 dt-pub=20040227 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=A Numerical Study on Statistical Diagnostics on Cox Proportional Hazards Models for Survival Data Analysis en-subtitle= kn-subtitle= en-abstract= kn-abstract=There have been proposed so far many methods of statistical diagnostics in Cox regression for checking the goodness of the estimated model or checking the adequacy of the data. The former type contains the checking of the overall goodness of fit, the validity of the assumption of proportional hazards and the proper functional forms of the effects of covariates. While the latter type contains the checking whether there exist singly and/or jointly influential observations in the data set. In the present paper we study numerically the performances of various methods of diagnostics including our method of influence analysis for multiple-case diagnostics (Sung and Tanaka, 2003) by analyzing a real data set of lung cancer patients. en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=SungJimin kn-aut-sei=Sung kn-aut-mei=Jimin aut-affil-num=1 ORCID= en-aut-name=TanakaYutaka en-aut-sei=Tanaka en-aut-mei=Yutaka kn-aut-name=田中豊 kn-aut-sei=田中 kn-aut-mei=豊 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 en-keyword=Cox regression kn-keyword=Cox regression en-keyword=Influence function kn-keyword=Influence function en-keyword=Local influence kn-keyword=Local influence en-keyword=Influential Subsets kn-keyword=Influential Subsets en-keyword=Cox-Snell residuals kn-keyword=Cox-Snell residuals en-keyword=Martingale residual kn-keyword=Martingale residual en-keyword=Deviance residual kn-keyword=Deviance residual END start-ver=1.4 cd-journal=joma no-vol=12 cd-vols= no-issue=1 article-no= start-page=71 end-page=76 dt-received= dt-revised= dt-accepted= dt-pub-year=2007 dt-pub=20070315 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=The effect of aeration and water intake on the water quality in the Asahi River Dam reservoir en-subtitle= kn-subtitle= en-abstract= kn-abstract=The Asahi River Dam reservoir is one of the important fresh water resources in Okayama, Japan, and its eutrophication has been noted since the 1980s. Therefore, aeration has been applied to control the growth of phytoplankton. In this study, we discussed the effect of aeration and water-intake depth on the water quality distribution in the reservoir, based on numerical simulation and observation. The principal conclusions were as follows:(1) The numerical simulation models applied here reproduced observations fairly well. (2) Water intake from the surfacce layer reduced the concentration of chlorophyll a in the surface layers. Water intake from the middle or bottom layer improved the deficit of dissolved oxygen in the bottom layers. (3) Aeration together with water intake from the middle or bottom layer improved the deficit of dissolved oxygen in the bottom layers. en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=ChenW. kn-aut-sei=Chen kn-aut-mei=W. aut-affil-num=1 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=YoshidaR. kn-aut-sei=Yoshida kn-aut-mei=R. aut-affil-num=2 ORCID= en-aut-name=KawaraOsami en-aut-sei=Kawara en-aut-mei=Osami kn-aut-name=河原長美 kn-aut-sei=河原 kn-aut-mei=長美 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=Nimi Branch Office of Okayama Prefecture affil-num=3 en-affil= kn-affil=岡山大学 en-keyword=the Asahi River Dam Reservoir kn-keyword=the Asahi River Dam Reservoir en-keyword=numerical simulation kn-keyword=numerical simulation en-keyword=eutrophication kn-keyword=eutrophication en-keyword=water intake depth kn-keyword=water intake depth en-keyword=dissolved oxygen kn-keyword=dissolved oxygen en-keyword=chlorophylla kn-keyword=chlorophylla END start-ver=1.4 cd-journal=joma no-vol=12 cd-vols= no-issue=1 article-no= start-page=63 end-page=70 dt-received= dt-revised= dt-accepted= dt-pub-year=2007 dt-pub=20070315 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Two dimensional homogenized models of steel fiber reinforced concrete en-subtitle= kn-subtitle= en-abstract= kn-abstract=The homogenization method is used to model steel fiber reinforced concrete SFRC by converting the random distribution of fibers to a periodic one. The periodic distribution is chosen to hold similar properties of the composite material in both perpendicular directions to represent an average approximation for the random distribution. The material is modeled as a composite with brittle matrix and elastic fibers. Two patterns of the unit cell are examined to establish the homogenized stiffiness matrix in elastic and plastic stages. A rigid plastic bonding is considered between matrix and fibers. The smeared crack model is used to represent the nonlinearity of concrete. The validity of the homogenized model is examined by comparing the numerical results with the experimental results. The results show good agreement with the experimental work when a suitable pattern of the unit cell is used. en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=Saif EideenS. A. kn-aut-sei=Saif Eideen kn-aut-mei=S. A. aut-affil-num=1 ORCID= en-aut-name=TaniguchiTakeo en-aut-sei=Taniguchi en-aut-mei=Takeo kn-aut-name=谷口健男 kn-aut-sei=谷口 kn-aut-mei=健男 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 en-keyword=fiber reinforced concrete kn-keyword=fiber reinforced concrete en-keyword=composite materials kn-keyword=composite materials en-keyword=homogenization kn-keyword=homogenization en-keyword=periodicity kn-keyword=periodicity en-keyword=finite element kn-keyword=finite element END start-ver=1.4 cd-journal=joma no-vol=11 cd-vols= no-issue=1 article-no= start-page=43 end-page=49 dt-received= dt-revised= dt-accepted= dt-pub-year=2006 dt-pub=20060315 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Modeling of fiber reinforced concrete by the homogenization method en-subtitle= kn-subtitle= en-abstract= kn-abstract=The simulation of mechanical bahavior of steel fiber reinforced concrete SFRC is introduced utilizing the homogenization method. The random distribution of fibers has been converted to a periodic distribution. Using the periodicity assumption, the boundary conditions for the unit cell are derived. The homogenized stiffness matrix is determined in elastic and plastic range. A numerical example to study the effect of the volume fraction of fibers is introduced. en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=Saif EldeenS. A. kn-aut-sei=Saif Eldeen kn-aut-mei=S. A. aut-affil-num=1 ORCID= en-aut-name=TaniguchiTakeo en-aut-sei=Taniguchi en-aut-mei=Takeo kn-aut-name=谷口健男 kn-aut-sei=谷口 kn-aut-mei=健男 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 en-keyword=fiber reinforced concrete kn-keyword=fiber reinforced concrete en-keyword=composite materials kn-keyword=composite materials en-keyword=homogenization kn-keyword=homogenization en-keyword=periodicity kn-keyword=periodicity en-keyword=finite element kn-keyword=finite element END start-ver=1.4 cd-journal=joma no-vol=12 cd-vols= no-issue=1 article-no= start-page=1 end-page=6 dt-received= dt-revised= dt-accepted= dt-pub-year=2007 dt-pub=20070315 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Numerical study of biodegradation of xenobiotic polymers based on exogenous depolymerization model with time dependent degradation rate en-subtitle= kn-subtitle= en-abstract= kn-abstract=A mathematical model for exogenous depolymerization with time dependent degradation rate is analyzed in order to study the biodegradation of polyethylene glycol. The weight distribution with respect to the molecular weight before and after cultivation of microorganisms were analyzed an inverse problem to determine the time dependent degradation rate. Numerical techniques to solve the inverse problem and to simulate the transition of the weight distribution are described. en-copyright= kn-copyright= en-aut-name=WatanabeMasaji en-aut-sei=Watanabe en-aut-mei=Masaji kn-aut-name=渡邊雅二 kn-aut-sei=渡邊 kn-aut-mei=雅二 aut-affil-num=1 ORCID= en-aut-name=KawaiFusako en-aut-sei=Kawai en-aut-mei=Fusako kn-aut-name=河合富佐子 kn-aut-sei=河合 kn-aut-mei=富佐子 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 en-keyword=biodegradation kn-keyword=biodegradation en-keyword=polyethylene glycol kn-keyword=polyethylene glycol en-keyword=mathematical model kn-keyword=mathematical model en-keyword=numerical simulation kn-keyword=numerical simulation END start-ver=1.4 cd-journal=joma no-vol=58 cd-vols= no-issue=552 article-no= start-page=232 end-page=240 dt-received= dt-revised= dt-accepted= dt-pub-year=1992 dt-pub=19920825 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Numerical Study on Heat Storage Characteristics of Inclined Rectangular Latent Heat Storage kn-title=傾斜く形潜熱蓄熱槽の蓄熱特性に関する数値計算 en-subtitle= kn-subtitle= en-abstract=熱エネルギーの有効利用および余剰空間の活用の立場より、著者らは、前報において、建物の壁、床および屋根空間をく形潜熱蓄熱槽とした場合の蓄熱特性（融解過程）に影響をおよぼす自然対流の効果を傾斜角そして加熱壁温度をパラメータとして実験的に検討した。その際、融解液相に発生する自然対流熱伝達が固液界面の移動速度および界面形状に決定的な影響をおよぼすことが実験結果として判明した。しかしながら、発生した自然対流の挙動および液相内の温度分布を詳細に検討するまでに至らなかった。従来よりこの種のく形潜熱蓄熱槽に関する解析的研究としては、Webb-Viskantaによる平均融解量を用いて一次元的に固液界面の移動を近似した一次元融解モデルによる報告がある。図1は、前報において得られた種々の傾斜角θに対する固液界面形状の差異を示したもので、θ＝0°の下面加熱の場合では、ほぼ一次元的に融解が進行するが、θ＝90°の垂直配置では融解量の増大とともに加熱壁に対向する断熱面の露出が観察される。さらに、θ＝150°の加熱面が上部に存在する場合には、固液界面が水平となるなど傾斜角θの変化に伴う自然対流様式および強さになり、複雑な固液界面を形成しながら融解が進行することになる。高価な潜熱蓄熱材を用いる蓄熱システムにおいては、その蓄熱材のほぼ100％近くを利用しないと省エネルギー機器としての役割を果たさなくなるとの指摘からも、特に融解末期の蓄熱特性を明確にする必要がある。このような背景のもとで、本研究は傾斜するく形潜熱槽内の自然対流挙動に関して、実験では測定困難である詳細な対流様式および対流強さの蓄熱特性に及ぼす影響を二次元融解モデルに基づく数値計算により傾斜角および槽寸法をパラメータとして明らかにするものである。この種の二次元融解モデルによる数値計算は傾斜角θ＝90°の垂直配置にて、Gadgil-GobinそしてBenardらにより試みられているが、いずれも固液界面移動速度および形状の報告のみで、傾斜角による効果を扱ったものはないようである。さらに、本研究は、二次元融解モデルによる計算の有用性を示すために、簡単な一次元融解モデルによる計算をも行って一次元融解モデルの適用範囲も両者の比較より明らかにするものである。得られた結果は、本研究で提案している建物の壁、床そして屋根空間などを利用した比較的その厚さの薄いく形潜熱蓄熱槽の蓄熱（固相融解）特性解明に関しての基礎資料を提供できるものと思われる。 kn-abstract=Melting characteristics of a solid phase-change material in an inclined rectangulr heat-storage enclosure heated from one side are investigated numerically. It is found that a two-dimensional model simulates the melting behavior of the inclined rectangular heat storage, as compared with the results of a one-dimensional model. In each quasi-static step, steady-state natural convection in the liquid phase is calculated by directly solving the governing equation of motion with a finite difference technique. It is noted that the time development of the melting process depends strongly on the natural convection behavior, which is changed by the inclination angle and geometrical dimensions of the rectangular heat-storage enclosure. en-copyright= kn-copyright= en-aut-name=InabaHideo en-aut-sei=Inaba en-aut-mei=Hideo kn-aut-name=稲葉英男 kn-aut-sei=稲葉 kn-aut-mei=英男 aut-affil-num=1 ORCID= en-aut-name=MoritaShinichi en-aut-sei=Morita en-aut-mei=Shinichi kn-aut-name=森田慎一 kn-aut-sei=森田 kn-aut-mei=慎一 aut-affil-num=2 ORCID= en-aut-name=NagayaMotohiro en-aut-sei=Nagaya en-aut-mei=Motohiro kn-aut-name=長谷元弘 kn-aut-sei=長谷 kn-aut-mei=元弘 aut-affil-num=3 ORCID= en-aut-name=NozuShigeru en-aut-sei=Nozu en-aut-mei=Shigeru kn-aut-name=野津滋 kn-aut-sei=野津 kn-aut-mei=滋 aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 affil-num=4 en-affil= kn-affil=岡山大学 en-keyword=Latent Heat Storage kn-keyword=Latent Heat Storage en-keyword=Melting Heat Transfer kn-keyword=Melting Heat Transfer en-keyword=Natural Convection kn-keyword=Natural Convection en-keyword=Numerical Study kn-keyword=Numerical Study en-keyword=Inclined Rectangular Cavity kn-keyword=Inclined Rectangular Cavity END start-ver=1.4 cd-journal=joma no-vol=62 cd-vols= no-issue=603 article-no= start-page=172 end-page=179 dt-received= dt-revised= dt-accepted= dt-pub-year=1996 dt-pub=19961125 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Numerical Analysis Model of Forced Convection Heat Transfer of a Layer of Spherical Particles Considering Boundary Wall Effect kn-title=固体境界壁近傍の影響を考慮した球状粒子充填層の強制対流熱伝達の数値解析モデルの提案 en-subtitle= kn-subtitle= en-abstract=本報では、比較的大きな直径（d=9.54～21.2mm）を有する球状粒子一段充填層に関する実験結果に基づく、壁近傍領域の流動・伝熱モデルの提案を試みる。具体的には、粒子充填層としての物理的意味が損なわれないよう、粒子直径程度のスケールを用いてミクロな立場の基礎式を空間平均化する。得られた粒子充填層に関する基礎式中の有効熱伝導率、浸透性、Forchheimer係数等の諸特性値は次のように評価する。前報の結果に基づき、球状粒子充填層が、壁面より粒子直径の半分までの壁近傍領域と、壁面より粒子直径の半分以上離れたコア領域の二領域から構成されると考え、各領域における諸特性値は、微細なスケールでの変化を考慮せず、その平均値にて一定とみなした扱いを行う。また、実験条件の大きく異なる従来の実験データとの比較も行い、本解析法の有用性についても検討を行う。 kn-abstract=A simple model for the heat transfer and pressure drop characteristics in a layer of spherical particles is proposed in the present study. The layer of spherical particles bounded by two parallel boundary walls is considered to consist in two regions, one of which is the near-wall region of particles within a half-diameter of the spherical particle from the wall, and the other is the core region of particles over a half-diameter of the spherical particle away from the wall. The characteristics of the near-wall region, such as the permeability, the Forchheimer coefficient, and the thermal dispersion coefficient, are determined based on the experimental data for a one-stage spherical particle layer. For the core region, the permeability and the Forchheimer coefficient are evaluated using previous correlations for a homogeneous spherical particle layer, while the thermal dispersion coefficient is modified from that given by the previous correlation for a homogeneous spherical particle layer to include the effect of the thermal conductivity ratio of the spherical particle and the fluid. The effective thermal conductivity of the layer of spherical particles is assumed to be constant in the present model. The validity of the model is proved by comparing the results of this analysis with experimental results under various conditions. en-copyright= kn-copyright= en-aut-name=OzakiKoichi en-aut-sei=Ozaki en-aut-mei=Koichi kn-aut-name=尾崎公一 kn-aut-sei=尾崎 kn-aut-mei=公一 aut-affil-num=1 ORCID= en-aut-name=InabaHideo en-aut-sei=Inaba en-aut-mei=Hideo kn-aut-name=稲葉英男 kn-aut-sei=稲葉 kn-aut-mei=英男 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 en-keyword=Spherical Particle Layer kn-keyword=Spherical Particle Layer en-keyword=Forced Convection Heat Transfer kn-keyword=Forced Convection Heat Transfer en-keyword=Effective Thermal Conductivity kn-keyword=Effective Thermal Conductivity en-keyword=Numeical Analysis kn-keyword=Numeical Analysis en-keyword=Wall Effect kn-keyword=Wall Effect END start-ver=1.4 cd-journal=joma no-vol=63 cd-vols= no-issue=609 article-no= start-page=274 end-page=281 dt-received= dt-revised= dt-accepted= dt-pub-year=1997 dt-pub=19970525 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Numerical Analysis of Heat Storage Characteristics of a Small Heat Storage Vessel Packed with Phase-Change Material Encapsulated into Spherical Hollow kn-title=球カプセル化潜熱蓄熱体を充填した小型潜熱蓄熱槽の蓄熱特性に関する数値解析 en-subtitle= kn-subtitle= en-abstract=近年、エネルギの有効利用の観点より、蓄熱技術に関する研究・開発が盛んに行われており、大型のビル空調等の比較的大規模なシステムにおいて、実用化が進んでいる。しかしながら、一般家庭用の蓄熱装置に関しては、電気温水器の普及は見られるものの、その普及率は非常に小さい現状にある。これは、既存の顕熱蓄熱型蓄熱槽は設備が大きいため、空間的余裕のないマンションやアパート等への設置が困難なことが主な原因であり、蓄熱槽の小型化・高性能化が重要な課題となっている。著者らは、前報で、比較的大きな球カプセル化潜熱蓄熱体を充填した小型の円筒状蓄熱槽の蓄熱特性に及ぼす熱媒体流速及び熱媒体流入温度の影響を、球カプセル直径及び蓄熱材物性値の異なる二種類の球カプセルか潜熱蓄体について実験的に検討した。その結果、熱媒体流速の小さい条件において生じる、蓄熱槽内の低温の熱媒体と高温の流入熱媒体との密度差による自然対流や、比較的大きな球カプセルによる蓄熱槽内壁近傍のチャンネリング流れにより、熱媒体が蓄熱槽内を複雑に流動することや、蓄熱特性が流れ状態の影響を受け複雑に変化することを明らかにした。従って、様々なパラメータの影響を受け、複雑に変化する、熱媒体の流動や蓄熱体の融解挙動を詳細に検討するための手段として、数値解析の必要性に迫られている。球カプセル状潜熱蓄熱体の充填された蓄熱槽に関する数値解析法については、従来より検討がなされているが、そのほとんどにおいては、壁面近傍における熱媒体流れの不均質性が無視し得る、蓄熱体寸法が蓄熱槽に比べて小さい場合が対象とされている。一方、秋山らは、壁面近傍不均質領域の影響を考慮した流動解析を試みているが、彼らの採用したモデルでは、壁面近傍の蓄熱体充填率を実際よりも小さく見積もるため、比較的大きな粒子状蓄熱体を用いた場合には、蓄熱量を過少に評価することになる。さらに、球状潜熱蓄熱体を用いた蓄熱槽に関しては、熱媒体の自然対流を考慮した解析は行われていない現状にある。本報では、壁面近傍での蓄熱体充填率を過少に評価することなく流動抵抗現象の表現が可能な、球状粒子充填層に関する著者らの流動モデルに浮力の項を付加した運動量の式を用い、壁近傍の不均質性と自然対流の双方を考慮した数値解析法の提案を試みる。円筒容器内の共存対流問題の解析には厳密には三次元モデルが必要であるが、蓄熱体内部の解析にはさらに次元が必要なため、莫大な計算機容量と計算時間が必要となる。そこで本研究では、前報の円筒状蓄熱槽を、主要寸法の等しい矩形蓄熱槽に置き換えることで二次元モデルを用いた解析を行う。なお、本報においては、前報で用いた球カプセル直径及び蓄熱材物性値の異なる二種類の球カプセル化潜熱蓄熱体を対象に解析を行い、提案する解析法の妥当性を種々の条件について検討すると共に、種々の熱媒体流入温度及び熱媒体流速条件についても解析を行い、熱媒体の流動挙動に及ぼす自然対流の影響やこれに伴う蓄熱挙動の変化についても詳細な検討を行う。さらに、壁面近傍における不均質性や自然対流の影響を無視した解析も行い、これらの排除による蓄熱特性の変化についても検討を行う。 kn-abstract=We numerically investigate heat storage characteristics of a small heat storage vessel packed with phase-change material (PCM) encapsulated into a spherical hollow. The heat storage vessel is dealt with as a porous medium, and the flow of the working fluid is analyzed two-dimensionally using the modified Darcian momentum equation which takes into account both the buoyancy effect and the channeling effect. The heat transfer in the encapsulated PCM is analyzed using a one-dimensional heat conduction model. It is clarified that the completion of the heat storage process is delayed by natural convection, since the incoming hot working fluid flows mainly near the upper part of the vessel. It is also found that the nonhomogeneity near the boundary walls prolongs the heat storage process since it decreases the flow resistance near the walls and promotes a bypass flow near the upper wall due to the natural convection. A nondimensional equation is derived for the time taken to complete heat storage, where the Fourier number is expressed as a function of the modified Stefan number, the modified Reynolds number and the modified Grashof number. en-copyright= kn-copyright= en-aut-name=OzakiKoichi en-aut-sei=Ozaki en-aut-mei=Koichi kn-aut-name=尾崎公一 kn-aut-sei=尾崎 kn-aut-mei=公一 aut-affil-num=1 ORCID= en-aut-name=InabaHideo en-aut-sei=Inaba en-aut-mei=Hideo kn-aut-name=稲葉英男 kn-aut-sei=稲葉 kn-aut-mei=英男 aut-affil-num=2 ORCID= en-aut-name=ShigemoriAkihiro en-aut-sei=Shigemori en-aut-mei=Akihiro kn-aut-name=茂森昭博 kn-aut-sei=茂森 kn-aut-mei=昭博 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 en-keyword=Numerical Analysis kn-keyword=Numerical Analysis en-keyword=Heat Storage kn-keyword=Heat Storage en-keyword=Latent Heat kn-keyword=Latent Heat en-keyword=Spherical Capsules kn-keyword=Spherical Capsules en-keyword=Natural Convection kn-keyword=Natural Convection en-keyword=Forced Convection kn-keyword=Forced Convection END start-ver=1.4 cd-journal=joma no-vol=56 cd-vols= no-issue=523 article-no= start-page=234 end-page=241 dt-received= dt-revised= dt-accepted= dt-pub-year=1990 dt-pub=19900825 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Numerical Simulation of Thermal Performance of a Salt-Gradient Solar Pond in a Cold Climate kn-title=寒冷地における塩水太陽池の熱特性評価 en-subtitle= kn-subtitle= en-abstract=太陽池（ソーラポンド）は、広い池に塩水や水などの熱容量の大きな液体を溜めて置き、降り注ぐ太陽エネルギーを低温集熱（最大100℃くらい）すると同時にその液体の大きな熱容量を利用して、それ自体を蓄熱装置とするものである。太陽池は通常の太陽熱利用システムに比してその大きな蓄熱能力にもかかわらず装置が簡単で、種々の地域で容易に利用可能な技術である。また、その蓄熱容熱の大きさより、太陽エネルギーの日単位での変化の影響をほとんど受けず、太陽池の蓄熱水温度は、日射の季節的変化により比較的長周期の変化をするために長期の太陽エネルギー蓄熱が可能となる。近年太陽池は、太陽熱エネルギーの蓄積ばかりでなく、各種低温廃熱の蓄熱場としての利用も考えられ始めている。太陽池には、蓄熱部より大気への熱対流による熱損失防止のための種々の方策が提案され、種類も多岐にわたる。本研究は、図1（a）に示すように無機塩濃度を太陽池底部に向かうに従って増大した安定な非対流層（Non-Convective Layer）を設けて、蓄熱層（下部対流層、Lower Convective Layer）よりの熱対流を抑上し、上部熱損失を軽減する塩水太陽池を対象とする。すなわち、下部対流層である蓄熱層へ入射した太陽エネルギーは、非対流層を通して伝導伝熱による損失、太陽熱側面および底面より土壌を経ての地下および大気への熱損失を差し引いた残りの熱エネルギーが蓄熱層に順次蓄積されることになる。非対流層の塩分濃度こう配は下方に従って塩分濃度が増大するように、濃度C、密度ρおよび温度Tの関係で熱、物質拡散を考慮して次のように与えられる。 kn-abstract=A one-dimensional numerical model which simulates the dynamic thermal performance of stratified salt-gradient solar pond is described. The model simulates the thermal performance in the upper convective layer, the nonconvective layer and the lower convective layer in a cold climate. In addition to the energy flux in the solar pond, the model simulates the varying ice thickness appearing in the upper convective layer during the winter season. From the results, it is noticed that it is important to maintain the optimum thickness of the nonconvective layer and the clearness of the upper convective layer for the high thermal efficiency of the salt-gradient solar pond. en-copyright= kn-copyright= en-aut-name=InabaHideo en-aut-sei=Inaba en-aut-mei=Hideo kn-aut-name=稲葉英男 kn-aut-sei=稲葉 kn-aut-mei=英男 aut-affil-num=1 ORCID= en-aut-name=FukudaTakeyuki en-aut-sei=Fukuda en-aut-mei=Takeyuki kn-aut-name=福田武幸 kn-aut-sei=福田 kn-aut-mei=武幸 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 en-keyword=Salt-gradient Solar Pond kn-keyword=Salt-gradient Solar Pond en-keyword=Heat Storage Characteristics kn-keyword=Heat Storage Characteristics en-keyword=Ice Formation kn-keyword=Ice Formation en-keyword=Numerical Simulation kn-keyword=Numerical Simulation END start-ver=1.4 cd-journal=joma no-vol=69 cd-vols= no-issue=685 article-no= start-page=138 end-page=145 dt-received= dt-revised= dt-accepted= dt-pub-year=2003 dt-pub=20030925 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Natural Convection Heat Transfer of Latent Heat Storage Type Microcapsule Slurry in a Rectangular Cavity with Two Opposing Heating and Cooling Vertical Walls kn-title=対向垂直加熱・冷却壁を有する矩形密閉容器内の潜熱マイクロカプセルスラリーの熱伝達 en-subtitle= kn-subtitle= en-abstract=近年、熱エネルギー有効利用を目的とした潜熱蓄熱システムに注目が集まっており、さまざまな蓄熱材が開発されている。中でも、潜熱体融点温度以下の状態においても、常に流動性を維持する潜熱マイクロカプセルスラリーや潜熱マイクロエマルジョンといった潜熱物質を含有する機能性熱媒体が蓄・放熱特性において有利であり有望視されている。このような潜熱体を分散媒中に分散混合させた機能性熱流体を蓄熱材として利用する場合には、加熱及び冷却時における自然対流挙動および熱伝達特性を把握しておくことが必要不可欠である。本研究は自然対流の基本的な形態の一つである垂直対抗加熱・冷却壁を有する矩形密閉容器に潜熱マイクロカプセルスラリーを充填した場合の自然対流挙動や熱伝達特性に影響を及ぼすスラリーの熱物性、潜熱量、そして容器寸法などの影響について数値解析により検討するものである。 kn-abstract=This paper has dealt with the natural convection heat transfer of the microcapsule slurry composed of phase change material (PCM) as a latent heat storage substance. A rectangular cavity with two opposing heating and cooling vertical walls was selected as the present research model. The temperature difference between heating and cooling walls, the width of the cavity and the PCM concentration were set as parameters of natural convection heat transfer. The heat transfer coefficient of heating and cooling wall, the flow velocity profile and the temperature distribution of the microcapsule slurry were calculated by numerical computation. It was clarified that the transportation of latent heat evolved by melting and solidifying of the PCM in the slurry exerted on a strong influence on the natural convection heat transfer. Moreover, it was found that the heat transfer coefficient reached at the local maximal value with an increase in temperature difference between heating and cooling walls. In addition, Nusselt number was influenced by the transportation effect of latent heat that was caused by melting and solidifying of the PCM. The numerical results revealed quantitatively that the natural convection heat transfer depended on the PCM concentration, temperature difference between heating and cooling walls, and width of the rectangular cavity. en-copyright= kn-copyright= en-aut-name=InabaHideo en-aut-sei=Inaba en-aut-mei=Hideo kn-aut-name=稲葉英男 kn-aut-sei=稲葉 kn-aut-mei=英男 aut-affil-num=1 ORCID= en-aut-name=MatsuoKouichi en-aut-sei=Matsuo en-aut-mei=Kouichi kn-aut-name=松尾幸一 kn-aut-sei=松尾 kn-aut-mei=幸一 aut-affil-num=2 ORCID= en-aut-name=HoribeAkihiko en-aut-sei=Horibe en-aut-mei=Akihiko kn-aut-name=堀部明彦 kn-aut-sei=堀部 kn-aut-mei=明彦 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 en-keyword=Natural Convection kn-keyword=Natural Convection en-keyword=Heat Transfer kn-keyword=Heat Transfer en-keyword=Microcapsule Slurry kn-keyword=Microcapsule Slurry en-keyword=Numerical Analysis kn-keyword=Numerical Analysis END start-ver=1.4 cd-journal=joma no-vol=69 cd-vols= no-issue=687 article-no= start-page=90 end-page=97 dt-received= dt-revised= dt-accepted= dt-pub-year=2003 dt-pub=20031125 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Adorption Enhancement of Rectangular Packed Bed with Spherical Adonrbent by Side Wall Cooling in a Forced Convection Flow kn-title=強制対流下における球状吸着剤矩形充填層の側面冷却による吸着促進 en-subtitle= kn-subtitle= en-abstract=住宅・ビル空調分野では、省エネルギーの促進や室内空気質そしてアメニテイ性の向上が米国やカナダように一部義務付けている状況あり、今後室内空気の調湿や換気に伴う空調負荷の増大が予想される。このような背景のもとに、大量に賦存する低温排熱の利用、省エネルギー促進そして室内空気環境の快適性志向をカバーする環境親和型熱技術（グリーンサーモテクノロジー）の最右翼である熱サイクル機器として、吸着剤を用いた吸着熱式冷凍機やヒートポンプそして調湿機やデシカントクーリング機器等がある。吸着剤を用いたヒートサイクルは、古くて新しい技術で、環境に優しい技術と言うことで米国や欧州等で開発普及が進んでおり、我が国の代替冷媒を用いた蒸気圧縮機型冷凍機の展開と対比するものである。これら吸着剤を用いた空調関連の調湿や調温利用以外に、吸着剤の水蒸気の吸着及び脱着過程において、水分の蒸発・凝縮潜熱に相当する多量の熱授受があることから、吸着剤は蓄熱材として利用の可能性がある。特に高温多湿な我が国の気候環境においては、湿り空気中の水蒸気を吸着剤に吸着（除湿）する際に発生する吸着熱（放熱）を暖房熱源等へ利用し、その脱着再生（加湿）においては排熱や太陽熱等を利用する、いわゆる化学蓄熱の構築が可能となる。従って、本基礎研究は、一般に普及している低温脱着が可能なシリカゲル吸着剤を蓄熱剤として利用することを前提として、まず冷却による平衡状態に至る吸着特性向上を数値計算で検討するものである。対象とする吸着系は、球状吸着剤を充填した矩形充填層に湿り空気を流動させるもので、吸着性能向上特性は矩形充填層側壁からの冷却による効果を種々の因子（冷却温度、湿り空気流入湿度、平均空気速度、球状吸着剤粒子直径や充填層の寸法）のもとで明らかにするものである。 kn-abstract=The present paper has dealt with the one-sidewall cooling effect of spherical adsorbent paticles packed in a rectangular bed on water vapor adsorption characteristics by a 2-dimensional numerical analysis. The analysis model was considered that one-sidewall of a rectangular packed bed with the homogeneous spherical silica-gel particles was cooled and another walls were adiabatic. The moist air flowed into the rectangular packed bed with spherical adsorbent particles. The silica-gel B with high adsorption ability over high relative humidity was selected as a suitable adsorbent. Numerical results revealed the effects of moist air inlet humidity and airflow velocity, size of spherical silica-gel particles and width of the rectangular packed bed and the sidewall cooling terperature on the amount of water vapor adsorption. en-copyright= kn-copyright= en-aut-name=InabaHideo en-aut-sei=Inaba en-aut-mei=Hideo kn-aut-name=稲葉英男 kn-aut-sei=稲葉 kn-aut-mei=英男 aut-affil-num=1 ORCID= en-aut-name=SeoJeong-Kyun en-aut-sei=Seo en-aut-mei=Jeong-Kyun kn-aut-name=徐貞均 kn-aut-sei=徐 kn-aut-mei=貞均 aut-affil-num=2 ORCID= en-aut-name=HoribeAkihiko en-aut-sei=Horibe en-aut-mei=Akihiko kn-aut-name=堀部明彦 kn-aut-sei=堀部 kn-aut-mei=明彦 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 en-keyword=Adsorption kn-keyword=Adsorption en-keyword=Wall Cooling Effect kn-keyword=Wall Cooling Effect en-keyword=Spherical Adsorbent kn-keyword=Spherical Adsorbent en-keyword=2-Dimensional Numerical Analysis kn-keyword=2-Dimensional Numerical Analysis en-keyword=Water Vapor kn-keyword=Water Vapor END start-ver=1.4 cd-journal=joma no-vol=70 cd-vols= no-issue=689 article-no= start-page=209 end-page=216 dt-received= dt-revised= dt-accepted= dt-pub-year=2004 dt-pub=200401 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Heat Storage Characteristics of Phase Change Material Microcapsule Slurry in a Rectangular Cavity with a Heating Vertical Wall kn-title=垂直加熱面を有する潜熱マイクロカプセルスラリー充填矩形蓄熱槽の蓄熱特性に関する数値計算 en-subtitle= kn-subtitle= en-abstract=内壁面のうちの一側面を加熱熱源とする短形蓄熱槽は、工業的な応用が多い基礎的な形態であり、従来から多くの研究がなされている。Eftekharらはパラフィンワックスを充填した垂直フィンを有する短形蓄熱槽の下面を加熱した場合における固駅境界線の移動を詳細に検討し、熱移動に関する実験整理式の提案を行っている。平田らは氷およびパラフィンを充填した短形蓄熱槽の下面を加熱した場合において、蓄熱材固相が固定されて移動しない場合と固相が浮力により移動し加熱面と接触する場合を比較することで接触融解の効果について検討を行っている。斉藤らも分割フィンを有する短形蓄熱槽を用いた蓄熱において接触融解の効果を検討している。これらの短形蓄熱槽の潜熱蓄熱に関する既往の研究は全て固液相変化を伴う水、パラフィン、低融点の金属などの物質を蓄熱材とするものであり、その蓄熱過程における熱源から蓄熱材への熱伝達特性や蓄熱完了時間、蓄熱材の移動といった蓄熱挙動は、蓄熱材の相状態、すなわち流動可能な液相であるか、流動しない古相であるかに強く依存している。一方、本件で対象とする潜熱マイクロカプセルスラリーはマイクロカプセル芯物質がその融点温度以下で凝固した状態においても、分散媒により流動性は維持され、蓄熱材スラリーを巨視的に観察した場合には固相蓄熱材の壁面への固着も発生せず、固液境界も存在しない性質を有している。融解・凝固の際の固液境界は個々のマイクロカプセル内に存在するのみである。このため蓄熱挙動を支配する要因は前述のような潜熱蓄熱に関する従来の研究とは大きく異なり、マイクロカプセル芯物質の相状態や潜熱マイクロカプセルスラリーの温度および潜熱マイクロカプセルの質量濃度による物性と僭熱量の変化が現象を支配する要因となる。このような潜熱マイクロカプセルスラリーの蓄熱材として用いた場合の非安定な蓄熱挙動を解明するため、潜熱マイクロカプセル質量濃度、蓄熱槽寸法、蓄熱熱源となる加熱壁面の温度などを操作パラメータとし、それらが蓄熱過程における加熱面から蓄熱材への熱伝達特性、蓄熱量および蓄熱材融解割合の経時変化、蓄熱完了時間などに与える影響を本研究において数値解析により検討した。 kn-abstract=This paper has dealt with the Heat storage characteristics of the microcapsule slurry composed of phase change material (PCM) as a latent heat storage material and water. A rectangular cavity with a heating vertical wall, which was filled with the microcapsule slurry, was selected as the present research model. The heating wall temperature, the width of the cavity and the PCM concentration were set as parameters. It was clarified that the transportation of latent heat evolved by melting of the PCM in the slurry exerted on a remarkable influence on the natural convection heat transfer. In addition, it was found that the heat transfer coefficient reached a local maximum value with an increase in initial temperature difference between heating wall and PCM. The heat storage completion time also have a local maximum value with an increase in heating wall temperature due to the latent heat by melting the PCM in the slurry. en-copyright= kn-copyright= en-aut-name=InabaHideo en-aut-sei=Inaba en-aut-mei=Hideo kn-aut-name=稲葉英男 kn-aut-sei=稲葉 kn-aut-mei=英男 aut-affil-num=1 ORCID= en-aut-name=MatsuoKoichi en-aut-sei=Matsuo en-aut-mei=Koichi kn-aut-name=松尾幸一 kn-aut-sei=松尾 kn-aut-mei=幸一 aut-affil-num=2 ORCID= en-aut-name=HoribeAkihiko en-aut-sei=Horibe en-aut-mei=Akihiko kn-aut-name=堀部明彦 kn-aut-sei=堀部 kn-aut-mei=明彦 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 en-keyword=Latent Heat Storage kn-keyword=Latent Heat Storage en-keyword=Microcapsule Slurry kn-keyword=Microcapsule Slurry en-keyword=Natural Convection kn-keyword=Natural Convection en-keyword=Numerical Computation kn-keyword=Numerical Computation END start-ver=1.4 cd-journal=joma no-vol= cd-vols= no-issue= article-no= start-page= end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=2004 dt-pub=20040930 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=波-海底地盤-構造物系の相互応答の数値モデリング kn-title=Numerical Modeling of Wave – Seabed – Structure Interaction en-subtitle= kn-subtitle= en-abstract= kn-abstract= en-copyright= kn-copyright= en-aut-name=LechosławGrzegorz Bierawski en-aut-sei=Lechosław en-aut-mei=Grzegorz Bierawski kn-aut-name=レホスワヴグゼゴズ ビエラヴスキ kn-aut-sei=レホスワヴ kn-aut-mei=グゼゴズ ビエラヴスキ aut-affil-num=1 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 END start-ver=1.4 cd-journal=joma no-vol= cd-vols= no-issue= article-no= start-page= end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=1999 dt-pub=19990325 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=マイクロマグネテｨックモデルを用いた磁気記録解析のための数値計算法に関する研究 kn-title=Study on Numerical Techniques for Magnetic Recording Analysis Using Micromagnetic Model en-subtitle= kn-subtitle= en-abstract= kn-abstract= en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=斎藤郁夫 kn-aut-sei=斎藤 kn-aut-mei=郁夫 aut-affil-num=1 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 END