検索結果 989 件
| JaLCDOI | 10.18926/17849 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_43_99.pdf |
| 著者 | Kato, Hidehiro| Nogami, Yasuyuki| Morikawa, Yoshitaka| |
| 抄録 | A square root (SQRT) algorithm in extension field F(p(m))(m = r(0)r(1)･･･r(n−1)･2(d), r(i) : odd prime, d : positive integer) is proposed in this paper. First, a conventional SQRT algorithm, the Tonelli-Shanks algorithm, is modified to compute the inverse SQRT in F(p(2d)), where most of the computations are performed in the corresponding subfields F(p(2i)) for 0 ≤ i ≤ d-1. Then the Frobenius mappings with addition chain are adopted for the proposed SQRT algorithm, in which a lot of computations in a given extension field F(p(m)) are also reduced to those in a proper subfield by the norm computations. Those reductions of the field degree increase efficiency in the SQRT implementation. The Tonelli-Shanks algorithm and the proposed algorithm in F(p(6)) and F(p(10)) were implemented on a Core2 (2.66 GHz) using the C++ programming language. The computer simulations showed that, on average, the proposed algorithm accelerated the SQRT computation by 6 times in F(p(6)), and by 10 times in F(p(10)), compared to the Tonelli-Shanks algorithm. |
| 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 | 99 |
| 終了ページ | 107 |
| ISSN | 1349-6115 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002308980 |
| JaLCDOI | 10.18926/17847 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_43_93.pdf |
| 著者 | Ueno, Hirokazu| Morikawa, Yoshitaka| |
| 抄録 | This paper investigates the relation between error distribution and predictive order of minimum mean abusolute error predictors (MMAE predictors) designed for lossless coding of grayscale images. Design of MMAE predictors reduces to the linear programming problem. Let k be the number of coefficients in a predictor (predictor order), we imagine that predictor order k may have a distribution shaping effect. Main purpose of this paper is to ensure that k has such an effect. |
| 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 | 93 |
| 終了ページ | 98 |
| ISSN | 1349-6115 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002308979 |
| JaLCDOI | 10.18926/17844 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_43_75.pdf |
| 著者 | 大江 啓太| 小西 正躬| 今井 純| |
| 抄録 | As is well known, an advanced knowledge and know-how are needed in the design and the diagnosis work. Further, human experts can cope with the recent trend of customers needs. Therefore, the design and the diagnosis work have been privately performed in the past, and its information cannot be shared. In addition, the number of experts is decreasing. It is a very important problem to maintain and to extend experts technologies having been built up. For the purpose, methods and systems for technical inheritance of the advanced techniques of the skilled engineers are needed to train the unskilled operators and also can assist skilled operators. In this research, attention is focused on the design of analog filter circuit. To attain the target, the circuit structural classifier system to support design work is developed. Furthermore, simulation technology for hot strip rolling mills based on distributed agents is presented aimed to develop tools for the diagnosis of hot strip rolling mills operation. |
| 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 | 75 |
| 終了ページ | 92 |
| ISSN | 1349-6115 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002308900 |
| JaLCDOI | 10.18926/17843 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_43_61.pdf |
| 著者 | 川村 真央| 小西 正躬| Yamagata, Katuki| Shimomura, Koichi| |
| 抄録 | In this research, a Human Interface system is designed intended to mobile crane. The intervention of human is unavoidable to attain the high performance of electro mechanical system. As is known, crane operation is complicated. Recently, the decrease of expert person induced crane accident. So in near future, it is required a partial automation of crane operation and human support technology. We are aiming at the development of the operation support system for a crane. In this research, development of the hydro mechanical models representing both of static and dynamics movements are made. Further, actual experimental data of operating mobile crane, which are electrical signal data and three-dimension (3D) position of moving load is measured. The actual operating data are compared with the model and it is found that the developed electromechanical model can explain the behaviors of actual data. |
| 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 | 61 |
| 終了ページ | 74 |
| ISSN | 1349-6115 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002308930 |
| JaLCDOI | 10.18926/17841 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_43_55.pdf |
| 著者 | 井上 真一郎| 小西 正躬| 今井 純| |
| 抄録 | In this research, an image processing method and a system for inspection support of a rod figured cutting tool are developed. As is well known, the visual inspection of a cutting tool by image processing is not easy, because cutting blade have a helical blade structure. To cope with the problem, an experimental facility with rotation and longitudinal tool shift functions to enable acquisition of blade surface pictures along a cutting rod is developed. The type of the defect treated in this paper is the spot of coating on blade surface. To judge the quality of the processed image of blade surface, neural network with autonomous learning is used. The processed image of cutting tool is divided into 64 × 64 blocks used for the input to the neural networks. Before input, each block data is preprocessed applying a edge detection filter and a transformation by the discrete fourier transform (DFT). Using these technologies, the experimental inspection system is built and tested to check the capabilities of the inspection algorithms. The diagnostic performance of the surface defect of a cutting tool was confirmed. There remained a problem to mis judge the normal tools as the defect. |
| 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 | 55 |
| 終了ページ | 60 |
| ISSN | 1349-6115 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002308973 |
| JaLCDOI | 10.18926/17839 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_43_49.pdf |
| 著者 | 赤松 慎也| 小西 正躬| 今井 純| |
| 抄録 | In this paper, the controlled target is the SCARA robot with two links, and the object is fine control of the arm head position of the robot. To attain the object, Internal Model Control (IMC) is introduced. A nonlinear equations are for robot dynamics formulated by solving Lagrange equation, and is linearized to design control system by IMC. The controller of IMC is designed or synthesisted as the inverse system of the linearized model, and IMC filter model is selected. Also, reference filter is introduced to make the improvement of performance. The result of control performance by IMC is compared with that of PID numerically, accuracy and incoherency are confirmed. |
| 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 | 49 |
| 終了ページ | 54 |
| ISSN | 1349-6115 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002308854 |
| JaLCDOI | 10.18926/17837 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_43_39.pdf |
| 著者 | 桑嶋 崇行| 今井 純| 小西 正躬| |
| 抄録 | This paper presents method of the controller design for one link arm with parametric uncertainty. Recently, many manufacturing robots are operated in manufacturing facilities, with the aim of labor and cost saving or improvement of the productivity. Such robots need to have positioning performance of high precision. In condition that there is an uncertainty in plant dynamics, desired control performance may not be attained because the controller is designed according to the mathematical model of a plant. So it is important that the designed control system have a robust control performance. In this paper, the robust controller is designed using Quantitative Feedback Theory (QFT) for one link arm with parametric uncertainty. Simulation experiments are run for control system designed by using QFT and conventional method. The results are compared with each other and it is found that the control system designed by QFT shows a robust performance and can suppress the unevenness of output against parametric uncertainty. |
| 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 | 39 |
| 終了ページ | 48 |
| ISSN | 1349-6115 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002308875 |
| JaLCDOI | 10.18926/17835 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_43_32.pdf |
| 著者 | 馬渕 周治| 小西 正躬| 今井 純| |
| 抄録 | A tractor-trailer vehicle in the factory might move on the route determined beforehand. However, automation of a tractor-trailer vehicle is difficult so that it is necessary to consider the nonlinearity of a vehicle and a trailer. In this research, the effective tracking control method of a tractor-trailer vehicle is proposed. The control method using time-state control form for a preview control is presented, and be applied a tractor-trailer vehicle with nonholonomic characteristics. Results of numerical experiments are presented to check effectiveness of the proposed control method. |
| 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 | 32 |
| 終了ページ | 38 |
| ISSN | 1349-6115 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002308736 |
| JaLCDOI | 10.18926/17833 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_43_27.pdf |
| 著者 | 東辻 浩夫| |
| 抄録 | When the Coulomb coupling between fine particles becomes sufficiently strong in fine particle plasmas, the isothermal compressibility of the whole system diverges and we have a phase separation and an associated critical point. Experimental conditions of fine particle plasmas, densities and temperatures of components and the fine particle size, are obtained corresponding to characteristic parameters around the critical point and the dependency on ion species and other factors is discussed. |
| 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 | 27 |
| 終了ページ | 31 |
| ISSN | 1349-6115 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002308947 |
| JaLCDOI | 10.18926/17831 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_43_22.pdf |
| 著者 | 東辻 浩夫| Chai Hong| 東辻 千枝子| 鶴田 健二| |
| 抄録 | For the transfer of quantum information and the creation of entangled states, the application of tuned spin chains, systems of spins with the nearest-neighbor coupling tuned so as to give high efficiency, has been proposed and some examples of high performance have been given by several authors. In this article, the effect of deviations from tuned values and the effect of resultant asymmetry are investigated through numerical simulations and theoretical analyses. It is shown that there exists a system where the transfer efficiency is comparable with exactly tuned ones and, at the same time, robust to noises in the coupling constants. It is also shown that the effect of asymmetry on the efficiency of entanglement creation is of the second order when the asymmetry is small. |
| 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 | 22 |
| 終了ページ | 26 |
| ISSN | 1349-6115 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002308966 |
| JaLCDOI | 10.18926/17829 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_43_16.pdf |
| 著者 | Kurose Tomoyuki| 鶴田 健二| 東辻 千枝子| 東辻 浩夫| |
| 抄録 | The finite-difference time-domain (FDTD) method has been applied to the calculation of the phonon band structure of two-dimensional (2D) phononic crystals, consisting of metal cylinders placed periodically in liquid. By comparing several combinations of materials for metal cylinder and liquid, we analyze the dependence of the band structures on sound speed and density of liquid media. Moreover, the negative refraction of the acoustic waves is observed at the interfaces between phononic crystal slab and the liquid. We find that an acoustic“lens effect”with the slab appears due to the negative refractions. The relationship between the focal intensity in the lens effect and the band structure is discussed. |
| 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 | 16 |
| 終了ページ | 21 |
| ISSN | 1349-6115 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002308928 |
| JaLCDOI | 10.18926/17826 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_43_8.pdf |
| 著者 | Umeda Ryosuke| 東辻 千枝子| 鶴田 健二| 東辻 浩夫| |
| 抄録 | Metamaterial which has negative permittivity and permeability is investigated via computer simulations. Effects of the nanostructure on dielectric and magnetic properties of the material are taken into account by introducing the Drude-Lorentz model in the materials dispersion. We include multi-band process in the dielectric response in order to reproduce accurately experimental values of bulk Au thin film. Size effect on the dispersion is examined by comparing the model with that of a noble metal particle. Based on the dispersion model constructed, we analyze the electromagnetic response of nanostructured metamaterials to evanescent waves at microwave and optical frequencies via finite-difference time-domain simulatioins on parallel computer. A re- focusing and an amplification of the evanescent waves propagating through a metamaterial, consisting of metal slab/vacuum stacking, is demonstrated for the frequencies of 30GHz and 744THz. |
| 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 | 8 |
| 終了ページ | 15 |
| ISSN | 1349-6115 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002308833 |
| JaLCDOI | 10.18926/17822 |
|---|---|
| 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 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002308710 |
| 著者 | 小倉 義郎| 木村 雄介| 植村 恒義| 山本 芳孝| 宇田川 哲夫| |
|---|---|
| 発行日 | 1974-06-30 |
| 出版物タイトル | 岡山医学会雑誌 |
| 巻 | 86巻 |
| 号 | 5-6号 |
| 資料タイプ | 学術雑誌論文 |
| 著者 | 実成 文彦| 大崎 紘一| 緒方 正名| |
|---|---|
| 発行日 | 1978-12-30 |
| 出版物タイトル | 岡山医学会雑誌 |
| 巻 | 90巻 |
| 号 | 11-12号 |
| 資料タイプ | 学術雑誌論文 |
| JaLCDOI | 10.18926/15841 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_10_1_61.pdf |
| 著者 | School of Engineering, Okayama University| |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1975-07-01 |
| 巻 | 10巻 |
| 号 | 1号 |
| 開始ページ | 61 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307517 |
| JaLCDOI | 10.18926/15840 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_21_2_31.pdf |
| 著者 | Taniguchi Takeo| Sanada Kenji| Matsumoto Hajime| Moriwaki Kiyoaki| |
| 抄録 | The aim of this paper is to present some remarks on the arrangement of finte element mesh modeling of the area adjacent to the crack-tip which locates in two-dimensional area. Since the stress distribution near crack-tip is singular, the arrangement of mesh pattern and the selection of mesh type in the crack area govern the accuracy of the solution. This paper gives some informations on the arrangement of finite elements in the area which are obtained through numerous number of numerical experiments. And the effectivity of Zooming Technique for stress analysis is clarified through the experiments. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1987-03-05 |
| 巻 | 21巻 |
| 号 | 2号 |
| 開始ページ | 31 |
| 終了ページ | 45 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307123 |
| JaLCDOI | 10.18926/15839 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_21_2_21.pdf |
| 著者 | Myojin Sho| Kishino Keiichi| |
| 抄録 | Car ownership in households is analyzed by disaggregate behavioral modeling technique. Two models are built to analyze characteristic features of car ownership. The results are (1) The number of driver licenses in a household is, as a matter of course, most influencing on car ownership and multi-ownership. (2) Family size is the second most influencing. (3) Utilily obtainable by owning second or third car is higher in the household of primary industry than that of the other industry. (4) Inclination of household to be car owner is stronger in a sparsely inhabited zone than in a densely inhabited. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1987-03-05 |
| 巻 | 21巻 |
| 号 | 2号 |
| 開始ページ | 21 |
| 終了ページ | 30 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307983 |
| JaLCDOI | 10.18926/15838 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_21_2_9.pdf |
| 著者 | Kawara Osami| Nasu Kiyotaka| |
| 抄録 | This study dealt with the characteristics of hydrodynamics of Kojima Lake and the influence of a regional sewage treatment system in construction on the lake. Clockwise and anticlockwise circulations are caused by seasonal winds in summer and winter, respectively. The distribution of a conservative material continuously discharged off the shore of the sewage treatment plant is scarcely affected by seasonal winds and river discharges. The sewage treatment system improves the water quality of the lake except T-N. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1987-03-05 |
| 巻 | 21巻 |
| 号 | 2号 |
| 開始ページ | 9 |
| 終了ページ | 19 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307442 |
| JaLCDOI | 10.18926/15837 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_21_2_1.pdf |
| 著者 | Takemoto Yoshito| Hida Moritaka| |
| 抄録 | We investigated the effects of resolved interstitial oxygen or nitrogen atoms and of quenched-in strain on the hardening of the single crystals grown from molten Ti-14 and 20wt pct Mo alloys. The aging treatment at 623K in atmosphere much more increased in the hardness of specimen surface than that in argon atmosphere. The quenched-in compressive stress enhanced age hardening due to omega formation. We surveyed in detail the hardness changes toward the center of plate-shaped single crystal. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1987-03-05 |
| 巻 | 21巻 |
| 号 | 2号 |
| 開始ページ | 1 |
| 終了ページ | 7 |
| ISSN | 0475-0071 |
| 言語 | 日本語 |
| 論文のバージョン | publisher |
| NAID | 120002307640 |