著者 | Faculty of Engineering, Okayama University| |
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発行日 | 2001-12 |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

巻 | 36巻 |

号 | 1号 |

資料タイプ | その他 |

著者 | Faculty of Engineering, Okayama University| |
---|---|

発行日 | 2002-03 |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

巻 | 36巻 |

号 | 2号 |

資料タイプ | その他 |

著者 | Faculty of Engineering, Okayama University| |
---|---|

発行日 | 2002-03 |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

巻 | 36巻 |

号 | 2号 |

資料タイプ | その他 |

JaLCDOI | 10.18926/46947 |
---|---|

フルテキストURL | mfe_38_1-2_005_014.pdf |

著者 | Ishimaru, Kazuhito| Konishi, Masami| Imai, Jun| Nishi, Tatsushi| |

抄録 | Temperature distribution in the reactor furnace is mainly operated by gas blowing from multiple tuyeres and material charge distribution. The objective of our research is obtain the optimal profile of gas flow to control temperature distribution in the reactor furnace in the shortest possible time. We formulated the optimization problem to reduce deviation of temperature distribution from its desired one in the reactor furnace. Based on the formulation, gas blow conditions are optimized by a sequential quadratic programming method to realize the desired temperature distribution. The validity of the method was checked through numerical experiments. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2004-03 |

巻 | 38巻 |

号 | 1-2号 |

開始ページ | 5 |

終了ページ | 14 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 80016785933 |

JaLCDOI | 10.18926/44495 |
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フルテキストURL | mfe_045_001_014.pdf |

著者 | Akiyoshi, Tatsuro| Imai, Jun| Konishi, Masami| |

抄録 | This paper presents a method of the controller design for the handling machine by using dsPIC(Digital Signal Processor + Peripheral Interface Controller). Recently, many manufacturing robots are operated in manufacturing facilities, with the aim of labor, cost saving, and improvement of the productivity. Such robots need to have positioning performance of high precision and simultaneously to save cost. In this paper, a digital optimal servo controller is designed, and it is implemented into our barebones controller which involves dsPIC. We have designed and manufactured the controller which is added suitable peripherals to improve the consistency between the mechanical machine operating in continuous time and controller in discrete time. The significance of this research is that digital implementation of the embedded system which has performance-limitation has ensured a comparable result, against the one with PC which has broad utility. When it is used as a controller, it is possible to restrain product prices greatly equivalent PC precision. We demonstrate potential that good control can be achieved even with low cost. Our research has lead to the viability of lower cost and higher performance system for the production process at factories. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2011-01 |

巻 | 45巻 |

開始ページ | 1 |

終了ページ | 14 |

ISSN | 1349-6115 |

言語 | English |

著作権者 | Copyright © by the authors |

論文のバージョン | publisher |

NAID | 120002905951 |

JaLCDOI | 10.18926/44496 |
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フルテキストURL | mfe_045_015_026.pdf |

著者 | Kanatani, Kenichi| Rangrajan, Prasanna| Sugaya, Yasuyuki| Niitsuma, Hirotaka| |

抄録 | We present a new least squares (LS) estimator, called “HyperLS”, specifically designed for parameter estimation in computer vision applications. It minimizes the algebraic distance under a special scale normalization, which is derived by rigorous error analysis in such a way that statistical bias is removed up to second order noise terms. Numerical experiments suggest that our HyperLS is far superior to the standard LS and comparable in accuracy to maximum likelihood (ML), which is known to produce highly accurate results in image applications but may fail to converge if poorly initialized. Our HyperLS is a perfect candidate for ML initialization. In addition, we discuss how image-based inference problems have different characteristics form conventional statistical applications, with a view to serving as a bridge between mathematicians and computer engineers. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2011-01 |

巻 | 45巻 |

開始ページ | 15 |

終了ページ | 26 |

ISSN | 1349-6115 |

言語 | English |

著作権者 | Copyright © by the authors |

論文のバージョン | publisher |

NAID | 120002905952 |

JaLCDOI | 10.18926/44497 |
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フルテキストURL | mfe_045_027_036.pdf |

著者 | Kanatani, Kenichi| Sugaya, Yasuyuki| |

抄録 | We describe in detail the algorithm of bundle adjustment for 3-D reconstruction from multiple images based on our latest research results. The main focus of this paper is on the handling of camera rotations and the efficiency of computation and memory usage when the number of variables is very large; an appropriate consideration of this is the core of the implementation of bundle adjustment. Computing the fundamental matrix from two views and reconstructing the 3-D structure from multiple views, we evaluate the performance of our algorithm and discuses technical issues of bundle adjustment implementation. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2011-01 |

巻 | 45巻 |

開始ページ | 27 |

終了ページ | 35 |

ISSN | 1349-6115 |

言語 | English |

著作権者 | Copyright © by the authors |

論文のバージョン | publisher |

NAID | 80021759249 |

JaLCDOI | 10.18926/44498 |
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フルテキストURL | mfe_045_036_045.pdf |

著者 | Kanatani, Kenichi| Niitsuma, Hirotaka| |

抄録 | We present a new method for optimally computing the 3-D rotation from two sets of 3-D data. Unlike 2-D data, the noise in 3-D data is inherently inhomogeneous and anisotropic, reflecting the characteristics of the 3-D sensing used. To cope with this, Ohta and Kanatani introduced a technique called “renormalization”. Following them, we represent a 3-D rotation in terms of a quaternion and compute an exact maximum likelihood solution using the FNS of Chojnacki et al. As an example, we consider 3-D data obtained by stereo vision and optimally compute the 3-D rotation by analyzing the noise characteristics of stereo reconstruction. We show that the widely used method is not suitable for 3-D data. We confirm that the renormalization of Ohta and Kanatani indeed computes almost an optimal solution and that, although the difference is small, the proposed method can compute an even better solution. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2011-01 |

巻 | 45巻 |

開始ページ | 36 |

終了ページ | 45 |

ISSN | 1349-6115 |

言語 | English |

著作権者 | Copyright © by the authors |

論文のバージョン | publisher |

NAID | 80021759250 |

JaLCDOI | 10.18926/44499 |
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フルテキストURL | mfe_045_046_053.pdf |

著者 | Nogami, Yasuyuki| Yanagi, Erika| Izuta, Tetsuya| Morikawa, Yoshitaka| |

抄録 | Recently, composite order pairing–based cryptographies have received much attention. The composite order needs to be as large as the RSA modulus. Thus, they require a certain pairing–friendly elliptic curve that has such a large composite order. This paper proposes an efficient algorithm for generating an ordinary pairing–friendly elliptic curve of the embedding degree 1 whose order has two large prime factors as the RSA modulus. In addition, the generated pairing–friendly curve has an efficient structure for the Gallant–Lambert–Vanstone (GLV) method. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2011-01 |

巻 | 45巻 |

開始ページ | 46 |

終了ページ | 53 |

ISSN | 1349-6115 |

言語 | English |

著作権者 | Copyright © by the authors |

論文のバージョン | publisher |

NAID | 120002905955 |

Squaring Algorithm Efficient for Cubic Extension Field Derived with Pseudo Gauss Period Normal Basis

JaLCDOI | 10.18926/44500 |
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フルテキストURL | mfe_045_054_059.pdf |

著者 | Nekado, Kenta| Takai, Yusuke| Nogami, Yasuyuki| Morikawa, Yoshitaka| |

抄録 | Recently, pairing–based cryptographies have attracted much attention. For fast pairing calculation, not only pairing algorithms but also arithmetic operations in extension field should be efficient. Especially for final exponentiation included in pairing calculation, squaring is more important than multiplication. This paper considers squaring algorithms efficient for cubic extension field which is often used for pairing implementaions. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2011-01 |

巻 | 45巻 |

開始ページ | 54 |

終了ページ | 59 |

ISSN | 1349-6115 |

言語 | English |

著作権者 | Copyright © by the authors |

論文のバージョン | publisher |

NAID | 80021759252 |

JaLCDOI | 10.18926/46948 |
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フルテキストURL | mfe_38_1-2_015_027.pdf |

著者 | Torigoe, Takashi| Konishi, Masami| Imai, Jun| Nishi, Tatsushi| |

抄録 | In these days, mechanical systems are becoming more complex and highly automated. So, there exist wide variety of demands for reliable diagnostic technology. A reliable data analysis and quantitative diagnosis method of mechanical system is necessary for the purpose. In this paper a quantitative diagnosis method for looper height control system has been developed based on neural network technologies. The wavelet transformation is used for pre-processing to analyze characteristics of looper height control system. And, self organizing map neural network is used for the purpose of classification based on the pre-processed data. After that, the classified results are used for quantitative diagnosis in hierarchical neural network. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2004-03 |

巻 | 38巻 |

号 | 1-2号 |

開始ページ | 15 |

終了ページ | 27 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 80016785934 |

JaLCDOI | 10.18926/46949 |
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フルテキストURL | mfe_38_1-2_029_032.pdf |

著者 | Totsuji, Hiroo| Totsuji, Chieko| Ogawa, Takafumi| Tsuruta, Kenji| |

抄録 | The structure of dust particles in dusty plasmas under microgravity has been analyzed by molecular dynamics simulation. The charge neutrality condition satisfied by the system composed of dust particles and ambient plasma is properly taken into account. It is shown that dust particles form shell structures at low temperatures and the number of shells are obtained as a phase diagram in the plane of two parameters characterizing the system: the number of particles and the strength of screening. It is also shown that these structures are almost independent of the strength of screening. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2004-03 |

巻 | 38巻 |

号 | 1-2号 |

開始ページ | 29 |

終了ページ | 32 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 80016863328 |

JaLCDOI | 10.18926/46950 |
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フルテキストURL | mfe_38_1-2_033_037.pdf |

著者 | Liman, M. Sanusi| Totsuji, Chieko| Tsuruta, Kenji| Totsuji, Hiroo| |

抄録 | The dynamic structure factor and the spectrum of the momentum-density fluctuations of 2D Yukawa liquids are analyzed in the domain of weak and intermediate coupling and screenlng parameters. The dispersion relations of the longitudinal and transverse collective excitations are obtained and compared with the random phase approximation (RPA) and harmonic approximation for triangular lattice. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2004-03 |

巻 | 38巻 |

号 | 1-2号 |

開始ページ | 33 |

終了ページ | 37 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 80016863329 |

JaLCDOI | 10.18926/46952 |
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フルテキストURL | mfe_38_1-2_039_059.pdf |

著者 | Kanatani, Kenichi| |

抄録 | We investigate the meaning of "statistical methods" for geometric inference based on image feature points. Tracing back the origin of feature uncertainty to image processing operations, we discuss the implications of asymptotic analysis in reference to "geometric fitting" and "geometric model selection", We point out that a correspondence exists between the standard statistical analysis and the geometric inference problem. We also compare the capability of the "geometric AIC" and the "geometric MDL' in detecting degeneracy. Next, we review recent progress in geometric fitting techniques for linear constraints, describing the "FNS method", the "HEIV method", the "renormalization method", and other related techniques. Finally, we discuss the "Neyman-Scott problem" and "semiparametric models" in relation to geometric inference. We conclude that applications of statistical methods requires careful considerations about the nature of the problem in question. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2004-03 |

巻 | 38巻 |

号 | 1-2号 |

開始ページ | 39 |

終了ページ | 59 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 80016889442 |

JaLCDOI | 10.18926/46953 |
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フルテキストURL | mfe_38_1-2_061_071.pdf |

著者 | Kanatani, Kenichi| Sugaya, Yasuyuki| |

抄録 | The Tomasi-Kanade factorization for reconstructing the 3-D shape of the feature points tracked through a video stream is widely regarded as based on factorization of a matrix by SVD (singular value decomposition). This paper points out that the core principle is the affine camera approximation to the imaging geometry and that SVD is merely one means of numerical computation. We first describe the geometric structure of the problem and then give a complete programming scheme for 3-D reconstruction. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2004-03 |

巻 | 38巻 |

号 | 1-2号 |

開始ページ | 61 |

終了ページ | 71 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 80016889443 |

JaLCDOI | 10.18926/14069 |
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フルテキストURL | Mem_Fac_Eng_OU_42_104.pdf |

著者 | Donghui, MA| Torii, Tashiyuki| Shimizu, Kenichi| Matsuba, Akira| |

抄録 | As model specimens of surface film-bonded materials, pure copper films with a thickness of 100μm were bonded to the surface of steel base with epoxy resin, where the tensile residual stress was measured by an X-ray on the surface copper film. The distribution of initial electric resistance was measured on both copper film and base specimen by a direct current potential drop technique. As a result, there was a good agreement between the measured and theoretical values. From the fatigue testing results, it was shown that the measured electric resistance increased with the fatigue crack length on the copper film, which was almost equal to the theoretical value calculated for a central slit in a plate with finite width. This was probably because the fatigue crack was opened due to the tensile residual stress on the film even under unloading condition. In addition, the internal crack length during fatigue was examined by ultrasonic testing for the film-bonded specimen. As a result, there was a difference in the fatigue crack length between the surface copper film and the inner base. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2008-01 |

巻 | 42巻 |

号 | 1号 |

開始ページ | 104 |

終了ページ | 109 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308537 |

JaLCDOI | 10.18926/14096 |
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フルテキストURL | Mem_Fac_Eng_OU_40_1_1.pdf |

著者 | 馬 有理| 清水 憲一| 鳥居 太始之| |

抄録 | A testing for bent fatigue crack propagation under mixed-mode conditions was carried out using fatigue and annealed slant precracks with different slant angles, β ,defined as the angle between loading and precrack directions in a rectangular plate. As a result, bent fatigue crack from the fatigue precrack with β =45deg. propagated under mixed-mode conditions with mode II stress intensity factor (K(II))(est) evaluated from the discontinuous displacement measured along the crack. On the other hand, bent fatigue crack from the fatigue precrack with β =60deg. and from the annealed precracks with both slant angles of β =60deg. and β =45deg. propagated under the mode I behavior. This was because the compressive residual stress near the fatigue precrack caused contact to each other between the upper and the lower surfaces of the precrack with the smaller slant angle β . Furthermore, the fatigue crack propagation rates indicated almost the same relationship for all the data, using the mixed-mode effective stress intensity factor (K(M))(est), calculated from the discontinuous displacement measured along the bent fatigue crack. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2006-01 |

巻 | 40巻 |

号 | 1号 |

開始ページ | 1 |

終了ページ | 8 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308402 |

JaLCDOI | 10.18926/17822 |
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フルテキストURL | Mem_Fac_Eng_OU_43_1.pdf |

著者 | Shimizu, Kenichi| Torii, Tashiyuki| Ishida, Koki| |

抄録 | Using a fatigue testing method by which fatigue cracks can be initiated and propagated in a film adhered to cover an elliptical through-hole in a base plate subjected to push-pull cyclic loads, annealed copper films with the thickness of 100μm and those reduced the thickness from the 100μm to 50μm by an electro-polishing were fatigued under a constant stress amplitude with a stress ratio of zero. The crystal rotation behavior with the fatigue crack propagation was investigated by measuring the crystal orientation around the fatigue crack initiated from the notch root before and after fatigue testing, using EBSD (Electron Back-scatter Diffraction) method. Then, the change of crystal orientation with fatigue testing was evaluated quantitatively from the misorientation between the crystal orientation matrix on the same point obtained before and after fatigue testing. As a result, the angle of the crystal rotation obtained from the region showing the high fatigue crack propagation rate was larger than that obtained from the region showing the low fatigue crack propagation rate for the film with the thickness of 100μm, while the fatigue crack propagated faster in the film with the thickness of 50μm than that with the thickness of 100μm regardless of the small crystal rotation angles with the fatigue testing for the film with the thickness of 50μm. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2009-01 |

巻 | 43巻 |

開始ページ | 1 |

終了ページ | 7 |

ISSN | 1349-6115 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308710 |

JaLCDOI | 10.18926/46954 |
---|---|

フルテキストURL | mfe_38_1-2_073_089.pdf |

著者 | Kenmochi, Yukiko| Imiya, Atsushi| |

抄録 | Boundary tracking and surface generation are ones of main topological topics for three-dimensional digital image analysis. However, there is no adequate theory to make relations between these different topological properties in a completely discrete way. In this paper, we present a new boundary tracking algorithm which gives not only a set of border points but also the surface structures by using the concepts of combinatorial/algebraic topologies. We also show that our boundary becomes a triangulation of border points (in the sense of general topology), that is, we clarify relations between border points and their surface structures. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2004-03 |

巻 | 38巻 |

号 | 1-2号 |

開始ページ | 73 |

終了ページ | 89 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 80016889444 |

JaLCDOI | 10.18926/46956 |
---|---|

フルテキストURL | mfe_38_1-2_097_100.pdf |

著者 | Yamagiwa, Masashi| Hirao, Taichi| Kiyomi, Masaaki| Akao, Tetsuyuki| Mizuki, Eiichi| Ohba, Michio| Sakai, Hiroshi| |

抄録 | Bacillus thuringiensis subsp. coreanensis A2316 is a newly isolated strain from Yonakunijima Island in Japan. It produces the proteinaceous inclusion body (crystal) which has no insecticidal and hemolytic activities. When the crystal proteins were digested by proteinase K, they exhibited the strong cytotoxicity against human leukemic T cell, MOLT-4. The proteinase K-digested A2316 crystal proteins have little damage upon the cell membrane of MOLT-4, suggesting that the cell death of MOLT-4 was induced through a mechanism other than the colloid-osmotic swelling and cell lysis as caused by hitherto known B. thuringiensis crystal proteins. The 29-kDa polypeptide proved to be an active component of the proteinase K-digested A2316 crystal proteins. EC(50) of the purified 29-kDa polypeptide was 0.0579 μg/ml. The N-terminal amino acid sequence of the 29-kDa polypeptide was identical with that of p29 produced by B. thuringiensis A1519 strain and shared no significant homology with all the known proteins, suggesting that this polypeptide belong to a new family of B. thuringiensis crystal proteins. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2004-03 |

巻 | 38巻 |

号 | 1-2号 |

開始ページ | 97 |

終了ページ | 100 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 80017001823 |