検索結果 2449 件
JaLCDOI | 10.18926/15455 |
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フルテキストURL | Mem_Fac_Eng_OU_23_1_1.pdf |
著者 | 松田 正明| 大崎 紘一| |
抄録 | Display equipment has been used as communication media in the factory, office, and home. In order to communicate effectively, it is necessary to clarify the characteristics of eye movement in the case of looking at the display. The development of Eye Camera enables us to measure eye movement during work, so that we can collect the many data of eye movement during work. In this study, we proposed a method to evaluate the visual work using the distribution of visual points in X and Y axis. The cumulative distribution is approximated by the logistic curve which shows the symmetry and kurtosis by the parameter. The proposed method was applied to the three typical display models, that is, the digital meter model, reading model, and game model. In the digital meter model, the visual points were distributed symmetrically along the meters, and the symmetry and kurtosis of the distribution varied by the arranged direction of the meter. In the reading model, the visual points were distributed nearly symmetrically and uniformly in each axis and they were moved around the character and line from the period of spectrum analysis. In the game model, the visual points moved according to the target and were distributed symmetrically in the Y axis. And whether the target moved vertically or horizontally, the kurtosis of the distribution became equal in each axis. |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 1988-11-22 |
巻 | 23巻 |
号 | 1号 |
開始ページ | 1 |
終了ページ | 12 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 120002307354 |
JaLCDOI | 10.18926/15447 |
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フルテキストURL | Mem_Fac_Eng_OU_28_1_129.pdf |
著者 | 谷口 健男| 廣瀬 壮一| Ouchterlony Finn| Nakagawa Kohji| Miyaji Akihiko| Fukuoka Yasufumi| |
抄録 | The testing method of rock toughness is proposed by the international society of rock mechanics (ISRM), but the results may be influenced by the test pieces, and the details of the crack propagation and the stress intensity factors are not clarified through the testing. Also the experimental test requires tedious works for the preparation of test specimen and economical responsibility. The present study aims to simulate numerically the rock toughness testing which is proposed by ISRM. For this purpose, the authors propose a numerical method which can simulate the experimental testing, and they show the propriety of the proposed method by comparing the results with the experimental and other numerical methods. At the same time, they clarify the details of crack propagation behaviors in rocks, and show the change of the stress intensity factors. The proposed method is based on the displacement-type finite element method, and several techniques are introduced to obtain accurate solution of the mechanical behavior near the crack-tip area. |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 1993-11-30 |
巻 | 28巻 |
号 | 1号 |
開始ページ | 129 |
終了ページ | 138 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 120002307126 |
JaLCDOI | 10.18926/15441 |
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フルテキストURL | Mem_Fac_Eng_OU_26_2_93.pdf |
著者 | 福山 淳| Kasai Takashi| 古谷 洋一郎| |
抄録 | A one-dimensional tokamak transport code (TASK/TR) has been developed to analyze the evolution of a burning plasma accompanied with fusion reaction. This code deals with the electrons, deuterons, tritons, thermalized α particles, fast α particles and beam ions, separately, in order to describe the dependence of the reaction rate on the ion mixture ratio. As an energy transport model, the drift wave turbulence mode is employed. The heating and current drive by the neutral beam injection as well as the pellet injection for fuelling are also included. This code is applied to a reactor-grade plasma aimed at in the ITER project. The cases of an ignited plasma and a current-driven plasma are examined. The required power for full current drive is estimated. The effect of pellet injection, both fuel and impurity ions, is also studied. |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 1992-03-28 |
巻 | 26巻 |
号 | 2号 |
開始ページ | 93 |
終了ページ | 109 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 120002307699 |
JaLCDOI | 10.18926/15439 |
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フルテキストURL | Mem_Fac_Eng_OU_26_2_77.pdf |
著者 | 和田 修己| Nakajima Masamitsu| |
抄録 | This paper describes a method to design an antenna to focus millimeter-wave beam generated by a gyrotron. The antenna, which has been proposed by the authors, consists of a stair-cut circular waveguide and two cylindrical reflectors; one is elliptic and the other is parabolic. Its principle is based on the geometrical optics though slightly modified to consider the diffraction effect. Results of low-power experiments agree well with the design on beam direction, beam width and the position of the focal point. At 35.5 GHz using TE(01) mode, a focused beam with half-power thickness of 13 mm x 10 mm was obtained. This type of antennas find applications to millimeter-wave scattering measurement in fusion plasma research and high- energy-density source for material heating. |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 1992-03-28 |
巻 | 26巻 |
号 | 2号 |
開始ページ | 77 |
終了ページ | 92 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 120002307321 |
JaLCDOI | 10.18926/15437 |
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フルテキストURL | Mem_Fac_Eng_OU_28_1_51.pdf |
著者 | 河野 伊一郎| Tanabe Kazuyasu| Tomita Takemitsu| |
抄録 | A technique for determining the layer structure and content of clay minerals was developed based on the relationship between temperature, and moisture characteristics of clay minerals. Moisture content in standard specimens, prepared by mixing montmorillonite, kaolinite and quartz in various proportions, was determined by measuring weight loss after heating. Based on the results from differential thermal analysis tests, the ignition loss method was found to be widely applicable to clays with montmorillonite and kaolinite as the main components. Dehydration of constituent water occurred at 530℃ and 800℃ in two- and three-layered clay minerals, respectively. |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 1993-11-30 |
巻 | 28巻 |
号 | 1号 |
開始ページ | 51 |
終了ページ | 59 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 120002307254 |
JaLCDOI | 10.18926/15436 |
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フルテキストURL | Mem_Fac_Eng_OU_26_2_69.pdf |
著者 | Fujii, Tatsuo| Sakata Naoki| Nanba, Tokuro| Osaka, Akiyoshi| Miura, Yoshinari| Takada, Jun| |
抄録 | (001)-oriented Ti(2)O(3) films were epitaxially grown on a(001)-face of sapphire single-crystalline substrate by an activated reactive evaporation method. The formation ranges of stoichiometric and nonstoichiometric Ti(2)O(3) films were determined as a function of the substrate temperature (Ts), the oxygen pressure (Po(2)) and the deposition rate. Stoichiometric Ti(2)O(3) films were grown at Ts≧673K under Po(2)≧1.0×10(-4)Torr, which showed the metal-insulator transition with a sharp change in electrical resistivity from 3.5×10(-2) to 2.6×10(-3)Ωcm at 361K. Nonstoichiometric films prepared under less oxidized conditions did not exhibit the transition. The nonstoichiometry of the Ti(2)O(3)films was discussed in terms of excess Ti ions. |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 1992-03-28 |
巻 | 26巻 |
号 | 2号 |
開始ページ | 69 |
終了ページ | 75 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 120002307639 |
JaLCDOI | 10.18926/15423 |
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フルテキストURL | Mem_Fac_Eng_OU_26_1_95.pdf |
著者 | 川上 浩司| 小西 忠孝| |
抄録 | This paper describes a method to construct IDEA BANK automatically. IDEA BANK is the data base of the "function-structure module" which is utilized in systematic conceptual design from Value Engineering perspectives. The method based on the Machine Learning EBL technique was evaluated and implemented for the IDEA BANK using SUN workstation. The practical implementation of the IDEA BANK acquisition was discussed after elucidating the problem and solution of the EBL technique in engineering design. In the IDEA BANK system, the structural features of an existing article are analyzed by hierarchically organized domain specific knowledge to yield a systematic explanation of how they function and attain their design goals. The explanation resulted in a generalized version of the Functional Diagram used in Value Engineering from which "function-structure module" can be extracted systematically. |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 1991-11-30 |
巻 | 26巻 |
号 | 1号 |
開始ページ | 95 |
終了ページ | 108 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 120002307756 |
JaLCDOI | 10.18926/15417 |
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フルテキストURL | Mem_Fac_Eng_OU_29_2_39.pdf |
著者 | 岡 久雄| 坂本 俊哉| Irie Takashi| |
抄録 | The body structures under the skin surface, such as bones and tendon, have an influence on the stiffness evaluation observed from the surface. In this case, the observed stiffness should be called an apparent stiffness. To obtain the biomechanical properties of skin itself, the influence of body structure should be removed. This study deals with the correction method of apparent viscoelasticity which calculated from apparent biomechanical impedance. This method is applied to the measured result of the forearm and the right chest to confirm its effectiveness. |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 1995-03-27 |
巻 | 29巻 |
号 | 2号 |
開始ページ | 39 |
終了ページ | 47 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 120002307527 |
JaLCDOI | 10.18926/15415 |
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フルテキストURL | Mem_Fac_Eng_OU_29_2_29.pdf |
著者 | 岡 久雄| 福田 敬| |
抄録 | In the stiffness evaluation from the skin surface, the body structure under the skin, like a bone and muscle, influences on the measurement results. The authors developed the measurement system of biomechanical impedance with applying a vibration of acoustic frequency onto the body surface. We measured the viscoelasticity of the silicone-gel model, which involves metal blocks, from the gel surface by using this system. The internal structure of model is estimated from the relation between the viscoelasticity and the distance from the gel surface to the internal block. Applying this method, the shape of ribs of the right chest are estimated. The shapes and viscoelasticity of silicone-gel tumor model, which has two different tumors, are also estimated. |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 1995-03-27 |
巻 | 29巻 |
号 | 2号 |
開始ページ | 29 |
終了ページ | 37 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 120002307199 |
JaLCDOI | 10.18926/15402 |
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フルテキストURL | Mem_Fac_Eng_OU_30_2_27.pdf |
著者 | 東辻 浩夫| 岸本 篤也| 東辻 千枝子| |
抄録 | The behavior of the Yukawa system in external one-dimensional force fields is analyzed by the molecular dynamics simulation. The formation of layered structures at low temperatures is observed and the relation between the number of layers and characteristic parameters of the system is obtained. Since the Yukawa system serves as a model of clouds of dust particles in plasmas (dusty plasma) which play an important role in plasma processes of semiconductor engineering, the results may be useful to control the quality of semiconductor wafers in such processes. In simulations, periodic boundary conditions are imposed in two dimensions and deformations of periodic boundaries are allowed in order to reduce the effect of boundaries without giving too much constraint on the symmetry. |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 1996-03-29 |
巻 | 30巻 |
号 | 2号 |
開始ページ | 27 |
終了ページ | 37 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 120002307582 |
JaLCDOI | 10.18926/15398 |
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フルテキストURL | Mem_Fac_Eng_OU_27_1_93.pdf |
著者 | 西垣 誠| Sudinda Teddy| Hishiya Tomoyuki| 河野 伊一郎| |
抄録 | In this paper the author will be describe phenomena of advection dispersion in subsurface flow by using Eulerian Lagrangian Finite Element Method. Where Finite Element Method with Galerkin formulation and weigthed residual method is used to solve seepage and advection dispersion equation. The problem of one dimensional and two dimensional rectangular wave are analyzed in this paper. And the result of numerical analyses will be compared with analytical solutions. The numerical results showed the very good agreement with the analytical solutions. |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 1992-11-25 |
巻 | 27巻 |
号 | 1号 |
開始ページ | 93 |
終了ページ | 105 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 120002307768 |
JaLCDOI | 10.18926/15392 |
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フルテキストURL | Mem_Fac_Eng_OU_27_1_45.pdf |
著者 | 香川 直己| 和田 修己| Hai, Xu| 古賀 隆治| Sano, Hiroya| Inubushi, Kazuyuki| |
抄録 | A prototype device based on the tunable diode laser absorption spectrometry was constructed and the atmospheric methane concentration near the terrain in a rice paddy field was measured. An open optical path of 50 m length was employed along with a PbSnTe diode laser. Diurnal change of methane density with 30 seconds temporal resolution was recorded associated with meteorological parameters. A feasibility was proven for a practical application for in situ study of atmospheric methane. |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 1992-11-25 |
巻 | 27巻 |
号 | 1号 |
開始ページ | 45 |
終了ページ | 53 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 120002307877 |
JaLCDOI | 10.18926/15391 |
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フルテキストURL | Mem_Fac_Eng_OU_27_1_33.pdf |
著者 | 島田 行恭| 鈴木 和彦| 佐山 隼敏| |
抄録 | Neural nets have recently become the focus of much attention, largely because of their wide range of complex and nonlinear problems. This paper presents a new integrated approach using neural networks for diagnosing process failures. The fault propagation in process is modeled by causal relationships from the fault tree and its minimal cut sets. The measurement patterns required for training and testing the neural network were obtained from fault propagation model. The network is able to diagnose even in the presence of malfunction of certain sensors. We demonstrate via a nitric acid cooler process how the neural network can learn and successfully diagnose the faults. |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 1992-11-25 |
巻 | 27巻 |
号 | 1号 |
開始ページ | 33 |
終了ページ | 44 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 120002307902 |
JaLCDOI | 10.18926/15388 |
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フルテキストURL | Mem_Fac_Eng_OU_27_1_11.pdf |
著者 | Hirashima Masao| 稲葉 英男| |
抄録 | To prevent freezing of road and aquaduct by extracting geothermal heat with two phase closed thermosiphon has been widely used in a cold area. Both heat transfer characteristics in the underground soil and function of the thermosiphon to extract geothermal heat have to be made clear for the purpose of the above system. This study is directed for the purpose to prevent freezing of fire hydrant and composed of the fundamental experiment and the empirical experiment. In the fundamental study, heat transfer behavior is studied experimentally in the small size filling bath representing the underground soil layer. After recording temperature distribution, heat transfer coefficient is measured, they are proceeded into the correlation between the dimensionless number of Nusselt, Rayleigh and Fourier. The fundamental study is described as the first report. |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 1992-11-25 |
巻 | 27巻 |
号 | 1号 |
開始ページ | 11 |
終了ページ | 26 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 120002307419 |
JaLCDOI | 10.18926/15380 |
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フルテキストURL | Mem_Fac_Eng_OU_35_197.pdf |
著者 | Nogami, Yasuyuki| Morikawa, Yoshitaka| |
抄録 | Modern communication engineerings, such as elliptic curve cryptographies, often requires algebra on finite extension field defined by modulus arithmetic with an irreducible polynomial. This paper provides a new method to detemine the minimal (irreducible) polynomial of a given proper element in finite extension field. In the conventional determination method, as we have to solve the simultaneous equations, the computation is very involved. In this paper, the well known "trace" is extended to higher degree traces. Using the new traces, we yield the coefficient formula of the desired minimal polynomial. The new method becomes very simple without solving the simultaneous equations, and about twice faster than the conventional method in computation speed. |
キーワード | finite field minimal polynomial irreducible polynomial higher degree trace trace cryptography |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 2001-03-27 |
巻 | 35巻 |
号 | 1-2号 |
開始ページ | 197 |
終了ページ | 205 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 120002307992 |
JaLCDOI | 10.18926/15377 |
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フルテキストURL | Mem_Fac_Eng_OU_30_1_47.pdf |
著者 | 加川 幸雄| Sun Yonghao| Mahmood Zaheed| |
抄録 | Regular boundary element method is employed for the variational formulation of Helmholtz equation that governs the waveguiding problems. Like in the Charge simulation method, in this method, the source points associated with the fundamental solutions are allocated outside the domain so that the singular integrals which occur in the standard boundary element procedure can be avoided. First, the formulation is developed for the two-dimensional scalar Helmholtz problem solving for the axial components of either electric or magnetic fields. The application of the formulation is shown for simple hollow rectangular waveguide and dielectric-slab-loaded rectangular waveguide. Then the formulation is extended for the analysis of dielectric waveguides of open type incorporating axial components of both electric and magnetic fields, for the solution of the propagating modes which are generally of hybrid types. To show the validity and quality of the formulation, it is applied to a circular step-index optical waveguide and a dielectric rectangular waveguide. Very close agreements have been found when the solutions are compared with the ones obtained by different methods. One distinct merit of the extended formulation is that it has been fixed to suppress the spurious solutions which are encountered while solved by the conventional boundary element method. |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 1995-12-28 |
巻 | 30巻 |
号 | 1号 |
開始ページ | 47 |
終了ページ | 62 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 120002307187 |
JaLCDOI | 10.18926/15367 |
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フルテキストURL | Mem_Fac_Eng_OU_30_1_9.pdf |
著者 | Ding Ronggui| 大崎 紘一| |
抄録 | Decision Support Systems (DSS) have been taken as hopeful support tools for decision making for more than 20 years. There are a lot of literatures on DSS, but most of them are not so practical as the designers expected. This paper points out the crux of this situation and argues that the research on DSS should pay some more attention to the decision making activities before the model using stage. A method named "Problem Situation Decomposing Graph (PSDG)" is presented in this paper for helping the decision maker(DM) elicit the decision making problems. A PSDG is an acycle AND/OR logical directed graph, and which includes all the factors affecting the problem situation based on the DM's knowledge. The logical nodes and parameter determining methods in PSDG can reflect the DM's decision making style. This paper introduces some basic concepts of PSDG, discusses some of its characteristics, and proposes a logical adjacency matrix for PSDG representation and analysis. |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 1995-12-28 |
巻 | 30巻 |
号 | 1号 |
開始ページ | 9 |
終了ページ | 17 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 120002307826 |
JaLCDOI | 10.18926/15364 |
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フルテキストURL | Mem_Fac_Eng_OU_35_137.pdf |
著者 | Sakiyama, Takaharu| Yoshimi, Tsuyoshi| Miyake, Akira| Umeoka, Midori| Tanaka, Atsushi| Ozaki, Sho| Nakanishi, Kazuhiro| |
抄録 | A monoacylglycerol lipase (MGL) was purified from Pseudomonas sp. LP7315 by ammonium sulfate precipitation, anion-exchange chromatography, and preparative electrophoresis. The purified enzyme was homogeneous on an SDS-polyacrylamide gel with a molecular mass of 59 kDa. Its hydrolytic activity was confirmed to be specific for monoglycerides: the enzyme did not hydrolyze diand triglycerides. MGL was found to be stable even after l-h incubation at 65℃. The hydrolytic activity depended not only on temperature and pH but also on the type of monoglyceride used. MGL also catalyzed monoglyceride synthesis at 65℃ in a solvent-free two-phase system, in which fatty acid droplets were dispersed in the glycerol phase with a low water content. The synthetic reaction proceeded at a constant rate for approximately 24 h and reached an equilibrium after 48 h of reaction. The initial rate of the synthetic reaction depended on several factors: the type of fatty acid used as the substrate, the amounts of fatty acid and glycerol, and the concentration of MGL in the glycerol phase. To analyze the effects of these factors, a kinetic model was developed based on the assumption that the adsorption equilibrium of MGL molecules at the interface between the two phases is the rate-determining factor for the synthetic reaction. The model was found to yield a good approximation of the initial synthetic rate under various reaction conditions. The analysis suggests that the adsorption behavior of MGL onto the interface had a large effect on the initial rate of the monoglyceride synthesis. |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 2001-03-27 |
巻 | 35巻 |
号 | 1-2号 |
開始ページ | 137 |
終了ページ | 146 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 120002307705 |
JaLCDOI | 10.18926/15362 |
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フルテキストURL | Mem_Fac_Eng_OU_35_97.pdf |
著者 | 山崎 進| 黒瀬 義則| |
抄録 | In this paper, we formulate a new integrity constraint in correlation with 3-valued stable models in an abduction framework based on general logic programs. Under the constraint, not every ground atom or its negation is a logical consequence of the theory and an expected abductive explanation, but some atom may be unspecified as a logical consequence by an adjustment. As a reflection of the integrity constraint with an adjustment, we augment an adjusting derivation to Eshghi and Kowalski abductive proof procedure, in which such an unspecified atom can be dealt with. |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 2001-03-27 |
巻 | 35巻 |
号 | 1-2号 |
開始ページ | 97 |
終了ページ | 135 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 120002307812 |
JaLCDOI | 10.18926/15361 |
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フルテキストURL | Mem_Fac_Eng_OU_35_77.pdf |
著者 | Kishimoto Tokunari| 東辻 千枝子| 鶴田 健二| 東辻 浩夫| |
抄録 | In order to perform the large-scale molecular dynamics simulation of the Yukawa system, a mathematical expression for molecular dynamics using the fast multipole method is described. The model simulations are also performed to test the performance of our implementation of the FMM. |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 2001-03-27 |
巻 | 35巻 |
号 | 1-2号 |
開始ページ | 77 |
終了ページ | 95 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 120002307940 |