JaLCDOI | 10.18926/14124 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_40_1_64.pdf |

著者 | 金谷 健一| |

抄録 | This article summarizes recent advancements of the theories and techniques for 3-D reconstruction from multiple images. We start with the description of the camera imaging geometry as perspective projection in terms of homogeneous coordinates and the definition of the intrinsic and extrinsic parameters of the camera. Next, we described the epipolar geometry for two, three, and four cameras, introducing such concepts as the fundamental matrix, epipolars, epipoles, the trifocal tensor, and the quadrifocal tensor. Then, we present the self-calibration technique based on the stratified reconstruction approach, using the absolute dual quadric constraint. Finally, we give the definition of the affine camera model and a procedure for 3-D reconstruction based on it. |

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 | 64 |

終了ページ | 77 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308332 |

JaLCDOI | 10.18926/14126 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_40_1_84.pdf |

著者 | Nogami, Yasuyuki| Morikawa, Yoshitaka| |

抄録 | This paper particularly deals with elliptic curves in the form of E(x, y) = y(2) − x(3) −b = 0, b ∈ F(* q) , where 3 divides q−1. In this paper, we refer to the well-known twist technique as x-twist and propose y-twist. By combining x-twist and y-twist, we can consider six elliptic curves and this paper proposes a method to obtain the orders of these six curves by counting only one order among the six curves. |

キーワード | elliptic curve twist third power residue/non-residue |

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 | 83 |

終了ページ | 94 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308548 |

JaLCDOI | 10.18926/14146 |
---|---|

フルテキストURL | Mem_Fac_Eng_39_1_21.pdf |

著者 | 鳥越 崇史| 小西 正躬| 今井 純| 西 竜志| |

抄録 | In this paper, neuro based intelligent diagnosis methods for electro-mechanical control system are proposed. A self organizing map neural network (SOM) is used to classify measured data of the target system as a qualitative diagnostic method. Besides of the above procedure, it is expected to attain more efficient maintenance by a quantitative estimation of failure. For the purpose, new method is proposed using a hierarchical neural network (HNN). In the method, classified results by SOM are processed for the quantitative diagnosis. Hierarchical neural network can identify inner structure of the relations between failure causes and its results that enables a quantitative diagnosis. |

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

発行日 | 2005-01 |

巻 | 39巻 |

号 | 1号 |

開始ページ | 21 |

終了ページ | 27 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308342 |

JaLCDOI | 10.18926/14148 |
---|---|

フルテキストURL | Mem_Fac_Eng_39_1_28.pdf |

著者 | 石丸 和史| 小西 正躬| 今井 純| 西 竜志| |

抄録 | In reactor furnace, due to high temperature and high pressure, data can be measured only near the furnace wall. In this paper, the way to estimate temperature distribution in a reactor furnace using measured data near the furnace walls and to control temperature distribution to the desired temperature distribution was studied. In the estimation, SQP method is employed using measured data near the furnace walls. As the result, the whole temperature distribution in a furnace could be obtained from such limited data. Furthermore, to control the temperature distribution in a reactor furnace, gas flow from multiple tuyeres and supplying material for controlling temperature distribution in a reactor furnace were determined by the SQP method. It was shown that temperature distribution in a furnace was regulated to achieve various desired distribution. Thus, it was verified that complicated temperature distribution in a reactor furnace could be controlled by combining furnace simulation and SQP method. |

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

発行日 | 2005-01 |

巻 | 39巻 |

号 | 1号 |

開始ページ | 28 |

終了ページ | 39 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308270 |

JaLCDOI | 10.18926/14149 |
---|---|

フルテキストURL | Mem_Fac_Eng_39_1_40.pdf |

著者 | Al-Sehaim, Sulaiman| 小西 正躬| 能勢 和夫| |

抄録 | In this paper, two problems, plant allocation problem and that of transfer routing from plants to customers, are considered simultaneously. Especially, adaptation scheme for emergency cases are checked. To solve these problems, decentralized agent based optimization procedures are used. In our study, oil production and products transfer in Saudi Arabia are treated. Through numerical experiments, practicability of the proposed method is verified. |

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

発行日 | 2005-01 |

巻 | 39巻 |

号 | 1号 |

開始ページ | 40 |

終了ページ | 45 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308505 |

JaLCDOI | 10.18926/14150 |
---|---|

フルテキストURL | Mem_Fac_Eng_39_1_46.pdf |

著者 | 門野 恵典| 東辻 千枝子| 鶴田 健二| 東辻 浩夫| |

抄録 | We present a real-space, polynomial-expansion approach to electron dynamics in nanostructured semiconductors. The Chebyshev expansion method is employed for efficient calculation of timeevolution of single-electron wave function. Details of the formulation are described. The method is applied to the electron transport in nanostructured semiconductors such as Si nanowires. The mean-square displacement and diffusivity of electron in Si chains are obtained as functions of length of the chains. The results show clearly ballistic behavior of electron in the pure Si chain. |

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

発行日 | 2005-01 |

巻 | 39巻 |

号 | 1号 |

開始ページ | 46 |

終了ページ | 51 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308231 |

JaLCDOI | 10.18926/14152 |
---|---|

フルテキストURL | Mem_Fac_Eng_39_1_52.pdf |

著者 | 金森 克也| 東辻 千枝子| 鶴田 健二| 東辻 浩夫| |

抄録 | Thermal behavior of Coulomb clusters in a three dimensional confining potential is investigated by molecular dynamics simulations for system sizes of 1,000 to 20,288 ions. The specific heat of the system of shell-structured 20,000 ions is peaked almost at the same temperature as the system of bcc-structured 20,288 ions with much sharper structure for the latter. The diffusion coefficient and the peak to valley ratio of the two-dimensional pair distribution function on the outermost shell are obtained both as a function of temperature. The rotational movement of each shell in the system of 104 ions is observed. |

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

発行日 | 2005-01 |

巻 | 39巻 |

号 | 1号 |

開始ページ | 52 |

終了ページ | 55 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308445 |

JaLCDOI | 10.18926/14153 |
---|---|

フルテキストURL | Mem_Fac_Eng_39_1_56.pdf |

著者 | 菅谷 保之| 金谷 健一| |

抄録 | We present a new method for extracting objects moving independently of the background from a video sequence taken by a moving camera. We first extract and track feature points through the sequence and select the trajectories of background points by exploiting geometric constraints based on the affine camera model. Then, we generate a panoramic image of the background and compare it with the individual frames. We describe our image processing and thresholding techniques. |

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

発行日 | 2005-01 |

巻 | 39巻 |

号 | 1号 |

開始ページ | 56 |

終了ページ | 62 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308594 |

JaLCDOI | 10.18926/14155 |
---|---|

フルテキストURL | Mem_Fac_Eng_39_1_63.pdf |

著者 | 金谷 健一| |

抄録 | Geometric fitting is one of the most fundamental problems of computer vision. In [8], the author derived a theoretical accuracy bound (KCR lower bound) for geometric fitting in general and proved that maximum likelihood (ML) estimation is statistically optimal. Recently, Chernov and Lesort [3] proved a similar result, using a weaker assumption. In this paper, we compare their formulation with the author’s and describe the background of the problem. We also review recent topics including semiparametric models and discuss remaining issues. |

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

発行日 | 2005-01 |

巻 | 39巻 |

号 | 1号 |

開始ページ | 63 |

終了ページ | 70 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308366 |

JaLCDOI | 10.18926/14156 |
---|---|

フルテキストURL | Mem_Fac_Eng_39_1_71.pdf |

著者 | Nogami, Yasuyuki| Morikawa, Yoshitaka| |

抄録 | This paper proposes an algorithm for generating prime order elliptic curves over extension field whose extension degree is a power of 2. The proposed algorithm is based on the fact that the order of the twisted elliptic curve is able to be a prime number when the extension degree for the twist operation is a power of 2. When the definition field is F(2(40)−87)(4) , the proposed algorithm can generate a prime order elliptic curve within 5 seconds on PentiumIII (800MHz) with C language. |

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

発行日 | 2005-01 |

巻 | 39巻 |

号 | 1号 |

開始ページ | 71 |

終了ページ | 81 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308036 |

JaLCDOI | 10.18926/14157 |
---|---|

フルテキストURL | Mem_Fac_Eng_39_1_82.pdf |

著者 | Wang, Feng| Nogami, Yasuyuki| Morikawa, Yoshitaka| |

抄録 | In this paper, we focus on developing a high-speed square root (SQRT) algorithm required for an elliptic curve cryptosystem. Examining Smart algorithm, the previously well-known SQRT algorithm, we can see that there is a lot of computation overlap in Smart algorithm and the quadratic residue (QR) test, which must be implemented prior to a SQRT computation. It makes Smart algorithm inefficient. The essence of our proposition is thus to present a new QR test and an efficient SQRT algorithm to avoid all the overlapping computations. The authors devised a SQRT algorithm for which most of the data required have been computed in the proposed QR test. Not only there is no computation overlap in the proposed algorithm and the proposed QR test, but also in the proposed algorithm over GF(p(2)) (4 | p − 1) some computations can be executed in GF(p); whereas in Smart algorithm over GF(p(2)) all the computations must be executed in GF(p(2)). These yield many reductions in the computational time and complexity. We implemented the two QR tests and the two SQRT algorithms over GF(pm) (m=1, 2) in C++ language with NTL (Number Theory Library) on Pentium4 (2.6GHz), where the size of p is around 160 bits. The computer simulations showed that the proposed QR test and the proposed algorithm over GF(p(m)) were about 2 times faster than the conventional QR test and Smart algorithm over GF(p(m)). |

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

発行日 | 2005-01 |

巻 | 39巻 |

号 | 1号 |

開始ページ | 82 |

終了ページ | 92 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308422 |

JaLCDOI | 10.18926/14158 |
---|---|

フルテキストURL | Mem_Fac_Eng_39_1_93.pdf |

著者 | 五百旗頭 健吾| 豊田 啓孝| 和田 修己| 古賀 隆治| |

抄録 | The optical properties of clouds were measured with a polarization Mie lidar during April, 2004 and investigated to categorize the particles detected by the lidar. The cloud layers were categorized into five types according to the depolarization ratios, as follows: (I) constant and small (less than 5%); increasing with height (II) nearly from 0% and (III) from about 50%; (IV) large and varying with the backscattering coefficient; and (V) sharply decreasing. This categorization of clouds enabled us to separate aerosols from clouds in a lidar signal. Comparison of the backscattering coefficients between clouds of types (I) and (II) suggested that the depolarization ratio induced by multiple scattering in dense clouds does not depend on the particle density. Estimation of the particle phase for the five cloud categories was also examined. |

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

発行日 | 2005-01 |

巻 | 39巻 |

号 | 1号 |

開始ページ | 93 |

終了ページ | 101 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308479 |

JaLCDOI | 10.18926/15399 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_27_2_1.pdf |

著者 | 梶原 康博| 大崎 紘一| |

抄録 | Precedence relation in assembly has been determined by experience only. Now, an expert system is developed for determining such precedence relation. The conjugate states of the units of a product are shown in face frames and unit frames following the frame model. Seven rules are formulated. They consider geometrical interference of units, and make the precedence relation enable operation time to be shorter, and the number of JIG and substandards to be smaller. These rules are programized by computer language(PROLOG). |

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

発行日 | 1993-03-25 |

巻 | 27巻 |

号 | 2号 |

開始ページ | 1 |

終了ページ | 9 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002307210 |

JaLCDOI | 10.18926/15164 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_35_41.pdf |

著者 | Kuroboshi, Manabu| Tanaka, Muneaki| Kishimoto, Suguru| Goto, Kentaro| Tanaka, Hideo| |

抄録 | In 360 females, Bone mineral density (BMD) in lumbar vertebrae (L2-L4) was assessed by quantitative computed tomography (QCT), and the values obtained were compared with the frequency of vertebral transformation or fracture as assessed by lateral scan image (scanogram) by X-ray CT. A correlation was observed between the frequency of vertebral transformation (or fracture) and lumbar BMD values : BMD under 125 mg/cm(3) was observed over 90% of women with vertebral transformation, and BMD under 70mg/cm(3) was found about 50% of them. These results suggest that decrease in BMD in lumbar vertebrae leads to vertebral transformation or fracture. Thus, measurement of BMD by QCT would be very useful in predicting vertebral transformation or fractures. |

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 | 41 |

終了ページ | 46 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002307948 |

JaLCDOI | 10.18926/15166 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_31_1_19.pdf |

著者 | 東辻 浩夫| 岸本 篤也| 東辻 千枝子| |

抄録 | 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. |

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

発行日 | 1996-12-27 |

巻 | 31巻 |

号 | 1号 |

開始ページ | 19 |

終了ページ | 33 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002307616 |

JaLCDOI | 10.18926/15401 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_30_2_21.pdf |

著者 | Tachibana Hiroyuki| 東辻 浩夫| |

抄録 | In order to apply quantum waveguides to electronic devices, we calculate the electrostatic potential in the split-gate quantum wire and establish the relation between the electrostatic potential and the square well potential which is usually assumed in simulations of these waveguides. The height and width of the square well potential are expressed as simple functions of the gate voltage and their dependencies are clarified. The results may be useful in calculating the characteristics of electronic devices based on quantum waveguides as functions of controllable parameters such as gate voltage. |

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 | 21 |

終了ページ | 25 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002307620 |

JaLCDOI | 10.18926/15402 |
---|---|

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 | English |

論文のバージョン | publisher |

NAID | 120002307582 |

JaLCDOI | 10.18926/15404 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_27_2_41.pdf |

著者 | Prokop Jiri| Myojin Sho| |

抄録 | The fundamental objective of this paper is to aggregate and establish a set of practical principles, guidelines, and procedures to clarify and improve classification yard design and to enhance the efficiency of the design process. The paper primarily addresses theoretical and technical aspects of hump yard height and grade design, placement of the switches and the retarders. It attempts to compile and document yard design procedures, based on the Theory of Energy Head and Energy Loss. This procedures are applicable to the design of new yards, rehabilitation of the existing yards of different types and sizes including manually operated as well as highly automated classification yards. |

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

発行日 | 1993-03-25 |

巻 | 27巻 |

号 | 2号 |

開始ページ | 41 |

終了ページ | 58 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002307241 |

JaLCDOI | 10.18926/15269 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_35_47.pdf |

著者 | 堂前 行宏| 小西 正躬| 今井 純| Asada, Hideki| Kitamura, Akira| |

抄録 | In this paper, an identification method of motor parameters for the diagnosis of rotor bar defects in the squirrel cage induction motor is proposed. It is difficult to distinguish the degree of deterioration by a conventional diagnostic method such as Fourier analysis. To overcome the difficulty, a motor simulator is used to identify the degree of deterioration of rotors in the squirrel cage induction motor. Using this method, the deterioration of rotor bars in the motor can be estimated quantitatively. |

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 | 47 |

終了ページ | 51 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002307181 |

JaLCDOI | 10.18926/15381 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_30_1_75.pdf |

著者 | 東辻 浩夫| 井上 嘉彦| 岸本 篤也| 東辻 千枝子| 奈良 重俊| |

抄録 | Molecular dynamics of the Yukawa system, the system of particles interacting via the Yukawa or the screened Coulomb potential, are formulated for various statistical ensembles and external conditions. The Yukawa potential smoothly interpolates the long-range Coulomb and the short-range interactions by adjusting a single parameter, the screening length. In order to reduce the effect of boundaries, the periodic boundary conditions are imposed and the deformations of the fundamental vectors of periodicity are taken into account. Ewald-type expressions for interaction energy, force, and kinematic pressure are given explicitly. |

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 | 75 |

終了ページ | 87 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002307479 |