JaLCDOI 10.18926/14119
フルテキストURL Mem_Fac_Eng_OU_40_1_31.pdf
著者 小川 貴史| 東辻 千枝子| 鶴田 健二| 東辻 浩夫|
抄録 We analyze the melting of spherical Yukawa clusters by Monte Carlo simulations. Spherical clusters are expected to be found in dusty plasmas in an isotropic environment such as microgravity and serve as a model for classical clusters. We obtain the specific heat through fluctuations of the potential energy and identify its peak as the transition temperature. Melting temperatures are compared with those of bulk Yukawa systems and it is confirmed that the melting temperature increases and approaches the bulk value with the increase of the system size.
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 31
終了ページ 35
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002308329
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 10.18926/14121
フルテキストURL Mem_Fac_Eng_OU_40_1_40.pdf
著者 三宅 隆| 東辻 千枝子| 鶴田 健二| 東辻 浩夫|
抄録 The electron system of arbitrary degeneracy can be mapped onto a classical system where electrons of the same spin are assigned an additional interaction and the effect of degeneracy is taken into account through an imaginative temperature. We apply this method to electrons in quantum dots modeled as two-dimensional electron liquid confined in a finite domain by a harmonic potential. We analyze distribution functions by molecular dynamics instead of solving integral equations which are not so useful in the case without translational invariance.
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 40
終了ページ 43
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002308268
JaLCDOI 10.18926/14125
フルテキストURL Mem_Fac_Eng_OU_40_1_78.pdf
著者 船曳 信生| 磯貝 愛| 東野 輝夫| Oda Masashi|
抄録 A variety of studies on face components such as eyes, lips, noses, and teeth have been proceeding in medicine, psychology, biometrics authentication, and other areas. In this paper, we present an algorithm of extracting eye contours from a face image using the deformable template matching method. Our template for an eye contour is composed of three quadratic functions for the perimeter and one circle for the pupil. In our algorithm, a digital color face image is rst converted to a binary image of representing eyes, after the region around eyes is identied on the face image by using hues and values of the color image. Then, parameters in the template are optimized by a local search method with a tabu period and a hill-climbing, so as to t the template to the eye contour in the binary image. The accuracy of our algorithm is evaluated through sample face images of students. In addition, the application of our proposal to eye shape indices is investigated in a face image database "HOIP", where recognizable dierence exists in index distributions between males and females.
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 78
終了ページ 82
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002308500
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 10.18926/14083
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 10.18926/14086
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 10.18926/14088
フルテキストURL Mem_Fac_Eng_OU_41_1_93.pdf
著者 Tarequl Islam Bhuiyan| 中西 真| 藤井 達生| 高田 潤|
抄録 Co-precipitation method has been employed to fabricate neodymium substituted hematite with different compositions from the aqueous solution of their corresponding metal salts. Thermal analysis and X-ray diffraction studies revealed the coexistence of Fe(2)O(3) and Nd(2)O(3) phases up to 1050℃ and formation of solid solution phase among them at 1100℃ and above temperatures, which was evidenced by shifting of the XRD peaks. Unit cell parameters and the cell volumes of the samples were found to increase by adding Nd(3+) ions in the reaction process. FESEM studies showed the suppression of particle growth due to the presence of Nd(3+) ions. Spectroscopic measurement evidenced that neodymium substituted hematite exhibited brighter yellowish red color tone than that of pure α-Fe(2)O(3).
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 93
終了ページ 98
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002308163
JaLCDOI 10.18926/14084
フルテキストURL Mem_Fac_Eng_OU_41_1_52.pdf
著者 稲葉 英男| Syahrul Husain| 堀部 明彦| 春木 直人|
抄録 The effects of heat and mass transfer parameters on the efficiency of fluidized bed drying have been studied to optimize the input and output conditions. The analysis was carried out using two different materials, wheat and corn. Energy and exergy models based on the first and second law of thermodynamic are developed. Furthermore, some unified non-dimensional experimental correlations for predicting the efficiency of fluidized bed drying process have been proposed. The effects of hydrodynamics and thermodynamics conditions such as the inlet air temperature, the initial moisture content and well known Fourier and Reynolds numbers on energy efficiency and exergy efficiency were analyzed using the developed model. A good agreement was achieved between the model predictions, non-dimensional correlations and the available experimental 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 52
終了ページ 62
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002308668
JaLCDOI 10.18926/14080
フルテキストURL Mem_Fac_Eng_OU_41_1_11.pdf
著者 Nogami, Yasuyuki| Morikawa, Yoshitaka|
抄録 This paper proposes an algorithm for generating irreducible cubic trinomials in the form x(3) + ax + b, b ∈ F(p), where a is a certain fixed non-zero element in the prime field F(p). The proposed algorithm needs a certain irreducible cubic trinomial over F(p) to be previously given as a generator; however, the proposed algorithm can generate irreducible cubic polynomials one after another by changing a certain parameter in F(p). In this paper, we compare the calculation cost and the average computation time for generating an irreducible cubic polynomial, especially trinomial, among Hiramoto et al. irreducibility testing algorithm, Berlekamp-Massey minimal polynomial determining algorithm, and the proposed algorithm. From the experimental results, it is shown that the proposed algorithm is the fastest among the three algorithms for generating irreducible cubic trinomials.
キーワード irreducible cubic polynomial minimal polynomial
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 11
終了ページ 19
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002308381
JaLCDOI 10.18926/14079
フルテキストURL Mem_Fac_Eng_OU_41_1_1.pdf
著者 Nogami, Yasuyuki| Morikawa, Yoshitaka|
抄録 In this paper, we first show the number of x's such that x(2) +u, u ∈ F(*)(p) , becomes a quadratic residue in F(p), and then this number is proven to be equal to (p+1)/2 if −u is a quadratic residue in Fp, which is a necessary fact for the following. With respect to the irreducible cubic polynomials over Fp in the form of x(3)+ax+b, we give a classification based on the trace of an element in F(p3) and based on whether or not the coefficient of x, i.e. the parameter a, is a quadratic residue in Fp. According to this classification, we can know the minimal set of the irreducible cubic polynomials, from which all the irreducible cubic polynomials can be generated by using the following two variable transformations: x=x + i, x=j−1x, i, j ∈ Fp, j ≠ 0. Based on the classification and that necessary fact, we show the number of the irreducible cubic polynomials in the form of x(3)+ax+b, b ∈ F(p), where a is a certain fixed element in F(p).
キーワード Irreducible cubic polynomial trace quadratic residue
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 1
終了ページ 10
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002308562
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 10.18926/14064
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 10.18926/14062
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