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
39巻
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 10.18926/14153
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
39巻
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 10.18926/14149
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
39巻
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 10.18926/14148
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
39巻
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 10.18926/14146
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
39巻
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 10.18926/14124
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
40巻
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 10.18926/14123
フルテキストURL Mem_Fac_Eng_OU_40_1_53.pdf
著者 金谷 健一| 菅谷 保之| Hanno Ackermann|
抄録 In order to reconstruct 3-D Euclidean shape by the Tomasi-Kanade factorization, one needs to specify an affine camera model such as orthographic, weak perspective, and paraperspective. We present a new method that does not require any such specific models. We show that a minimal requirement for an affine camera to mimic perspective projection leads to a unique camera model, which we call a symmetric affine camera, which has two free functions. We determine their values from input images by linear computation and demonstrate by experiments that an appropriate camera model is automatically selected.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2006-01
40巻
1号
開始ページ 53
終了ページ 63
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002308664
JaLCDOI 10.18926/14122
フルテキストURL Mem_Fac_Eng_OU_40_1_44.pdf
著者 菅谷 保之| 金谷 健一| 金沢 靖|
抄録 Dense point matches are generated over two images by rectifying the two images to align epipolar lines horizontally, and horizontally sliding a template. To overcome inherent limitations of 2-D search, we incorporate the “naturalness of the 3-D shape” implied by the resulting matches. After stating our rectification procedure, we introduce our multi-scale template matching scheme and our outlier removal technique using tentatively reconstructed 3-D shapes. Doing real image experiments, we discuss the performance of our method and remaining issues.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2006-01
40巻
1号
開始ページ 44
終了ページ 52
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002308593
JaLCDOI 10.18926/14099
フルテキストURL Mem_Fac_Eng_OU_40_1_23.pdf
著者 菊池 純二| 小西 正躬| 西 竜志| 今井 純|
抄録 In steel works, iron ores are stored in ore yard and sent to various plants of down stream accoding to transfer requests. To attain stable operation, it is neccesary to keep a certain allowable stock level in ore tanks of all plants. To this purpose, ore transfer routing method has been developed based on decentralized agent method. In case of disaster such as a big earthquake or a big fire, damages in the facilities of industrial complex may be unavoidable. In this paper, decentralized optimization method is tested to cope with such emergencies. Decentralized agents corresponding to kind of ore make their own transfer route plan exchanging information with others. As the application of the proposed method, transfer scheduling in ore yard in steel works are made in case of destruction of transfer facilities.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2006-01
40巻
1号
開始ページ 23
終了ページ 30
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002308160
JaLCDOI 10.18926/14098
フルテキストURL Mem_Fac_Eng_OU_40_1_16.pdf
著者 阿部 快洋| 小西 正躬| 西 竜志| 今井 純|
抄録 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.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2006-01
40巻
1号
開始ページ 16
終了ページ 22
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002308615
JaLCDOI 10.18926/14097
フルテキストURL Mem_Fac_Eng_OU_40_1_9.pdf
著者 貫名 高史| 小西 正躬| 西 竜志| 今井 純|
抄録 Controls of the temperature, pressure and flowing quantity are important for the stable operation of the product quality in the distillation tower. The usual measuring way of product quality estimation is made by the off-line analysis. In this paper, online estimation method of product quality is studied for improving the product quality. The estimation method based on stochastic analysis was developed for online estimation. In this paper, the data of temperature, pressure and flow volum in the distillation tower are treated. As the estimation models, RNN (Recurrent Neural Net Work) and PLS (Partial Least Square Regression Method) were adopted. The actual plant data were used in the analysis. Both PLS and RNN models could compensate each other to improve the accuracy in estimation.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2006-01
40巻
1号
開始ページ 9
終了ページ 15
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002308095
JaLCDOI 10.18926/14087
フルテキストURL Mem_Fac_Eng_OU_41_1_73.pdf
著者 金谷 健一|
抄録 A rigorous accuracy analysis is given to various techniques for estimating parameters of geometric models from noisy data for computer vision applications. First, it is pointed out that parameter estimation for vision applications is very different in nature from traditional statistical analysis and hence a different mathematical framework is necessary in such a domain. After general theories on estimation and accuracy are given, typical existing techniques are selected, and their accuracy is evaluated up to higher order terms. This leads to a “hyperaccurate” method that outperforms existing methods.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2007-01
41巻
1号
開始ページ 73
終了ページ 92
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002308410
JaLCDOI 10.18926/14086
フルテキストURL Mem_Fac_Eng_OU_41_1_63.pdf
著者 金谷 健一| 菅谷 保之|
抄録 The convergence performance of typical numerical schemes for geometric fitting for computer vision applications is compared. First, the problem and the associated KCR lower bound are stated. Then, three well known fitting algorithms are described: FNS, HEIV, and renormalization. To these, we add a special variant of Gauss-Newton iterations. For initialization of iterations, random choice, least squares, and Taubin’s method are tested. Numerical simulations and real image experiments and conducted for fundamental matrix computation and ellipse fitting, which reveals different characteristics of each method.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2007-01
41巻
1号
開始ページ 63
終了ページ 72
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002308585
JaLCDOI 10.18926/14083
フルテキストURL Mem_Fac_Eng_OU_41_1_44.pdf
著者 前野 良太| 小西 正躬| 今井 純|
抄録 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.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2007-01
41巻
1号
開始ページ 44
終了ページ 51
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002308128
JaLCDOI 10.18926/14082
フルテキストURL Mem_Fac_Eng_OU_41_1_31.pdf
著者 濱名 良平| 小西 正躬| 今井 純|
抄録 Various kind of productions are made in semiconductor factories, where it employs the production system with multiprocess and multiple Automated Guided Vehicles(AGVs) for transportation. It is difficult to optimize planning of production and transportation simultaneously because of the complicated flow of semifinished products. This paper describes the formulations of production scheduling and transportation routing, and algorithm for simultaneous optimization of plannings by using logic cuts. The entire problem is decomposed to the master problem and the sub problem. If it derives the infeasible solutions, new constraints are added to the master problem to eliminate the solution area including infeasible solutions. The results of about optimality and computation time by using CPLEX solver are shown compared with conventional decomposition method to check up effectivity of proposed method in small size problem, and about optimality and computaion time for large scale problem.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2007-01
41巻
1号
開始ページ 31
終了ページ 43
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002308108
JaLCDOI 10.18926/14081
フルテキストURL Mem_Fac_Eng_OU_41_1_20.pdf
著者 今村 拓司| 小西 正躬| 今井 純|
抄録 In this paper, we propose a simultaneous optimization method for inventory control and production planning problem for a chemical batch plant. The plant consists of blending process, intermediate storage tanks and filling process. In the proposed method, the original problem is decomposed into production planning sub-problem and inventory control sub-problem. Then the decision variables are optimized by alternately solving each sub-problem. The solution of the proposed method is compared with that of centralized optimization method. The effectiveness of the proposed method is investigated from numerical computational results.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2007-01
41巻
1号
開始ページ 20
終了ページ 30
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002308626
JaLCDOI 10.18926/14065
フルテキストURL Mem_Fac_Eng_OU_42_91.pdf
著者 Ryohei, Hamana| 小西 正躬| 今井 純|
抄録 Various kind of productions are made in semiconductor fabrications, where it employs the production system with multiprocesses and multiple Automated Guided Vehicles(AGVs) for transportation. It is difficult to optimize planning of production and transportation simultaneously because of the complicated flow of semifinished products. This paper describes the formulations of production scheduling, transportation routing and sequence planning of material handling system, and algorithm for simultaneous optimization of plannings by using solution space reduction and simulated annealing method. In this paper, all production system is decomposed to the production scheduling problem, transportation routing problem by AGVs and sequence planning of material handling system with managing stockers and buffers. Production scheduling problem and transportation routing problem are solved by the optimization algorithm using the decomposition routing problem. Sequence planning of material handling robot problem is solved by the algorithm using simulated annealing method.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2008-01
42巻
1号
開始ページ 91
終了ページ 103
ISSN 0475-0071
言語 Japanese
論文のバージョン publisher
NAID 120002308279
JaLCDOI 10.18926/14064
フルテキストURL Mem_Fac_Eng_OU_42_79.pdf
著者 Notsu Tadafumi| 小西 正躬| 今井 純|
抄録 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.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2008-01
42巻
1号
開始ページ 79
終了ページ 90
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002308624
JaLCDOI 10.18926/14063
フルテキストURL Mem_Fac_Eng_OU_42_71.pdf
著者 Kawase, Koichi| 小西 正躬| 今井 純|
抄録 In this research, Fuzzy control theory is applied to the inventory control of the supply chain between multiple companies. The proposed control method deals with the amount of inventories expressing supply chain between multiple companies. Referring past demand and tardiness, inventory amounts of raw materials are determined by Fuzzy inference. The method that an appropriate inventory control becomes possible optimizing fuzzy control gain by using SA method for Fuzzy control. The variation of uncertain demand is given to the proposal method. Furthermore, the method of forecasting demand and the effectiveness of fuzzy control method are confirmed by numerical experiments. As the results, the proposal method suppressed increase in an unnecessary cost when demand varies.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2008-01
42巻
1号
開始ページ 71
終了ページ 78
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002308296
JaLCDOI 10.18926/14062
フルテキストURL Mem_Fac_Eng_OU_42_60.pdf
著者 Kikuchi, Junji| 小西 正躬| 今井 純|
抄録 In steel works, molten metals discharged from blast furnace are put into a pan for transportation called torpedo and transported to steel making factory by a locomotive. In molten metals transportation, it becomes issues to prevent temperature drop of molten metals for stable production of down stream plants to shorten transportation time. Therefore it is necessary to make an appropriate plan for molten metals transfer considering the production and the transportation simultaneously. In this paper, molten metals transfer planning method is proposed including production scheduling. That is, torpedo schedule, transfer request assignment and route plan of locomotives are optimized according to each objective.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2008-01
42巻
1号
開始ページ 60
終了ページ 70
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002308612