| 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 |
| 巻 | 40巻 |
| 号 | 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 | 10.18926/14124 |
|---|---|
| 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 | 10.18926/14149 |
|---|---|
| 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 | 10.18926/14153 |
|---|---|
| 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 | 10.18926/15399 |
|---|---|
| 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 | 10.18926/19962 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_44_73.pdf |
| 著者 | Imanaka, Hiroyuki| Tanaka, Soukichi| Feng, Bin| Imamura, Koreyoshi| Nakanishi, Kazuhiro| |
| 抄録 | We used modified Czapek-Dox (mCD) or dextrin-peptone-yeast extract (DPY) media to cultivate a filamentous fungus, Aspergillus oryzae IAM 2706 by three different cultivation methods, i.e., shaking-flask culture (SFC), agar-plate culture (APC), and membrane-surface liquid culture (MSLC), to identify the differences in cultivation behaviors and gene transcriptional profiles. The fungi cultivated by APC or MSLC secreted a greater number of different proteins/enzymes in larger quantities compared with fungi cultivated by SFC, particularly when DPY medium was used. In particular, the amounts of protease secreted by fungi cultivated via MSLC or APC were much greater compared with SFC. When mCD medium was used, α-amylase activity was barely detectable in all cultures while the activity was detected in MSLC and APC in a quantity that was several times higher than that in SFC using DPY medium. SDS-PAGE analysis and N-terminal amino acid sequences confirmed 6 proteins in the culture supernatants when DPY medium was used. Among these proteins oryzin (an alkaline protease) and α-amylase were detected at much higher levels in APC and MSLC compared with SFC, which was consistent with the measured activity of the secreted enzymes. However, when mCD medium was used, only oryzin was detected in significant amounts in MSLC and APC. Microarray analyses of the fungi cultivated by SFC, APC or MSLC using either mCD or DPY media indicated that the gene transcriptional profile of the MSLC sample was similar to that of the APC sample but different from that of the SFC sample. When mCD medium was used, most of the genes that were up-regulated 10-folds or greater in the MSLC sample relative to the SFC sample were unknown or predicted proteins. Transcription of the oryzin gene was only slightly up-regulated in the MSLC sample while transcription of the α-amylase gene was slightly down-regulated. On the other hand, when DPY medium was used, many known genes including the oryzin gene were up-regulated in the MSLC sample versus the SFC sample. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 2010-01 |
| 巻 | 44巻 |
| 開始ページ | 73 |
| 終了ページ | 83 |
| ISSN | 1349-6115 |
| 言語 | English |
| 論文のバージョン | publisher |
| NAID | 120002309053 |
| 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 | 10.18926/14135 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_39_1_7.pdf |
| 著者 | 王 暁群| 阿部 武治| 多田 直哉| 清水 一郎| |
| 抄録 | Roughening on free surface of polycrystalline metal during plastic deformation is closely related to the inhomogeneous deformation in the respective grain at the surface. Uniaxial tensile tests are carried out on annealed pure aluminum sheet specimens with various averaged grain sizes. The roughening is measured by a 3-dimensional stylus instrument to examine the roughness change in both sides of specimen surfaces at each strain. The irregularities on one side are reversed on the backside, when the averaged grain size is as large as the thickness of the specimen. Discussions are made on the relation between the surface shapes of both sides adopting the cross correlation factor. The strains of respective grains are also measured from the grain boundary shape before and after plastic deformation. There are some deviations in the strains of the grains and their standard deviation increases with the applied strain. |
| 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 | 7 |
| 終了ページ | 15 |
| ISSN | 0475-0071 |
| 言語 | English |
| 論文のバージョン | publisher |
| NAID | 120002308149 |
| JaLCDOI | 10.18926/15344 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_35_1.pdf |
| 著者 | 阿部 武治| Hualin Song| Akagi Yasuo| 清水 一郎| |
| 抄録 | Free surface of polycrystalline metal becomes roughened after plastic deformation. The surface roughening is closely related to the inhomogeneity of polycrystalline metals, that is, to the inhomogeneous plastic deformation of respective grains. In the present study, inhomogeneous deformation on the free surface of polycrystalline aluminum specimen during uniaxial tension is studied. The inhomogeneous deformation of grains in the central area of the free surface of specimen is observed by the laser scanning microscope, while the inhomogeneous deformation perpendicular to the surface is studied by the laser scanning microscope as well as the stylus measuring instrument. It is shown that the surface roughness and the strain of respective grains increase with the applied strain. Discussions are made on the change in the surface roughness, the strain in each grain and the slip-line angles with the applied strain. |
| 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 | 1 |
| 終了ページ | 8 |
| ISSN | 0475-0071 |
| 言語 | English |
| 論文のバージョン | publisher |
| NAID | 120002307340 |
| JaLCDOI | 10.18926/15359 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_34_19.pdf |
| 著者 | Okada, Akira| Uno, Yoshiyuki| Okajima, Isao| |
| 抄録 | In EDM, the machining characteristics greatly depend on the energy distribution. Therefore, it is very important to clarify the energy distribution for understanding various phenomena in EDM. In this paper, the energy distribution in EDM with graphite electrode is investigated by measuring the temperatures of electrode and workpiece. Experimental analysis shows that the material removal rate depends on energy density while the electrode wear greatly depends on the adhesion of heat resolved carbon from machining fluid, and the energies distributed into electrode and workpiece are almost constant regardless of pulse duration. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 2000-03-27 |
| 巻 | 34巻 |
| 号 | 1-2号 |
| 開始ページ | 19 |
| 終了ページ | 26 |
| ISSN | 0475-0071 |
| 言語 | English |
| 論文のバージョン | publisher |
| NAID | 120002307707 |
| JaLCDOI | 10.18926/15405 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_30_2_39.pdf |
| 著者 | 東辻 千枝子| |
| 抄録 | A simple model for oxygen ion conduction in perovskite compounds is proposed. The potential for an oxygen ion is calculated as the sum of the long range Coulomb potential and short range repulsive potential in a cubic lattice. The activation energy is estimated as the difference in the values of potential at the barrier and at the stable site. When appropriate conditions are satisfied, the activation energy has a minimum as a function of lattice constant in accordance with recent experiments. |
| 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 | 39 |
| 終了ページ | 43 |
| ISSN | 0475-0071 |
| 言語 | English |
| 論文のバージョン | publisher |
| NAID | 120002307769 |
| JaLCDOI | 10.18926/19594 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_31_2_39.pdf |
| 著者 | Imayoshi Naoki| 早川 聡| 大槻 主税| 尾坂 明義| |
| 抄録 | Nb(2)O(5)-and Ta(2)O(5)-doped calcium si1icate glasses were soaked for various periods in a simulated body fluid(Kokubo solution) up to 30 days. Apatite formation ability of the surface of these glasses were investigated with thin-film X-ray diffraction and FT-IR reflection spectroscopy. The effects of these additive oxides on the bioactivity of CaO･SiO(2) based glass were discussed. A small amount of Nb(2)O(5) and Ta(2)O(5) suppressed the rate of silica hydrogel layer formation and the apatite formation on the surface of the glasses. The rate of the apatite nucleation on the surface of Nb(2)O(5)-doped calcium silicate glass was slower than that on the surface of Ta(2)O(5)-doped calcium silicate glass. It was concluded that the decrease in the apatite forming ability of calcium silicate glasses by these additive oxides is attributed to the suppression of formation of silica hydrogel layer which plays an important role in apatite nucleation. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1997-03-28 |
| 巻 | 31巻 |
| 号 | 2号 |
| 開始ページ | 39 |
| 終了ページ | 44 |
| ISSN | 0475-0071 |
| 言語 | English |
| 論文のバージョン | publisher |
| NAID | 120002309151 |
| JaLCDOI | 10.18926/19596 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_31_2_45.pdf |
| 著者 | 尾坂 明義| Kobayashi Keizo| 早川 聡| 大槻 主税| |
| 抄録 | The thermal expansion coefficient of some bioactive glasses in the system CaO-SiO(2)-B(2)O(3) were adjusted to be similar to that of titanium by controlling the composition. A glass of composition 45CaO･30SiO(2)･25B(2)O(3) was selected among those as the enameling glass. A slurry was prepared by mixing the glass powder and ethanal to be developed on titanium and heated at 740℃ for 30 min. Thus treated specimen was soaked in a simulated body fluid (Kokubo solutiion). FT-IR reflection and thin film X-ray diffraction analyses indicated apatite formation on the glass coating layer within 12 h of soaking in the fluid. Thus titanium could be provided with bioactivity due to the enameling. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1997-03-28 |
| 巻 | 31巻 |
| 号 | 2号 |
| 開始ページ | 45 |
| 終了ページ | 51 |
| ISSN | 0475-0071 |
| 言語 | English |
| 論文のバージョン | publisher |
| NAID | 120002309181 |
| JaLCDOI | 10.18926/19628 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_32_1.pdf |
| 著者 | Guo, Changning| Uno, Yoshiyuki| Okada, Akira| Takagi, Takashi| |
| 抄録 | Low electrode wear EDM is attained by the adhesion of heat resolved carbon made from kerosine type machining fluid to the electrode end surface. This phenomenon, however, occurs only under long pulse duration. Therefore, the low electrode wear EDM under finishing condition is impossible so far. In the previous paper, the authors developed a turbostratic carbon electrode whose structure is very similar to the heat resolved carbon generated in EDM process and made it clear that the low electrode wear EDM was possible by using the electrode even under finishing condition. In this study, a carbon coated electrode and a SiC coated one which can be made rapidly at low cost were developed and their EDM characteristics were investigated. Experimental analysis pointed it out that both electrodes were effective in reducing electrode wear under finishing condition. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1998-04-20 |
| 巻 | 32巻 |
| 号 | 1-2号 |
| 開始ページ | 1 |
| 終了ページ | 6 |
| ISSN | 0475-0071 |
| 言語 | English |
| 論文のバージョン | publisher |
| NAID | 120002309140 |
| 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 |