| JaLCDOI | 10.18926/15402 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_30_2_27.pdf |
| Author | Totsuji, Hiroo| Kishimoto, Tokunari| Totsuji, Chieko| |
| Abstract | 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. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1996-03-29 |
| Volume | volume30 |
| Issue | issue2 |
| Start Page | 27 |
| End Page | 37 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307582 |
| JaLCDOI | 10.18926/15403 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_27_2_19.pdf |
| Author | Nara, Shigetoshi| Totsuji, Hiroo| |
| Abstract | Numerical simulations of a single layer recurrent neural network model in which the synaptic connection matrix is formed by summing cyclic products of succesive patterns show that complex dynamics can occur with the reduction of a connectivity parameter which is the number of connection between neurons. The structure in these dynamics is discussed from the viewpoint of realizing complex function using complex dynamics. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1993-03-25 |
| Volume | volume27 |
| Issue | issue2 |
| Start Page | 19 |
| End Page | 40 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307451 |
| JaLCDOI | 10.18926/15404 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_27_2_41.pdf |
| Author | Prokop Jiri| Myojin Sho| |
| Abstract | 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. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1993-03-25 |
| Volume | volume27 |
| Issue | issue2 |
| Start Page | 41 |
| End Page | 58 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307241 |
| JaLCDOI | 10.18926/15405 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_30_2_39.pdf |
| Author | Totsuji, Chieko| |
| Abstract | 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. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1996-03-29 |
| Volume | volume30 |
| Issue | issue2 |
| Start Page | 39 |
| End Page | 43 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307769 |
| JaLCDOI | 10.18926/15406 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_27_2_59.pdf |
| Author | Prokop Jiri| Myojin Sho| |
| Abstract | The paper presents methods for simulation and examination of the performance of a classification yard, including both manual and computer-aided methods. Presented methods are applicable to the simulation and examination of full range of yards of different types and sizes including manually operated as well as highly automated classification yards. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1993-03-25 |
| Volume | volume27 |
| Issue | issue2 |
| Start Page | 59 |
| End Page | 71 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307384 |
| JaLCDOI | 10.18926/15407 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_26_1_1.pdf |
| Author | Sakakibara, Akira| Kanadani, Teruto| |
| Abstract | Reversion of the age-hardened Al-15mass % Zn alloy, in which ellipsoidal GP zones were formed, was investigated by hardness test. Ellipsoidal zones were reverted more quickly near the surface and grain boundary than in the interior, as spherical zones did. The results confirm their role as sources for vacancies in reversion. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1991-11-30 |
| Volume | volume26 |
| Issue | issue1 |
| Start Page | 1 |
| End Page | 7 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002308003 |
| JaLCDOI | 10.18926/15408 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_29_2_1.pdf |
| Author | Sakakibara, Akira| Nakagawa, Keiyu| Kanadani, Teruto| |
| Abstract | Effect of addition of a small amount of copper to Al- 12mass % Zn binary alloy on the process of low temperature aging is studied by hardness test and transmission electron microscopy. Age hardening rate after quenching from various temperatures is slowed down by addition of 0.5mass % copper to the binary alloy. The hardness obtained after long aging, however, is increased a little by the addition of copper. The extent of soft surface layer formed by aging in the copper-added alloy is nearly equal to that obtained in the binary alloy. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1995-03-27 |
| Volume | volume29 |
| Issue | issue2 |
| Start Page | 1 |
| End Page | 4 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307763 |
| JaLCDOI | 10.18926/15409 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_29_2_5.pdf |
| Author | Inaba, Hideo| Tu Ping| Ozaki, Koichi| |
| Abstract | Transient characteristics of the rectangular latent heat storage vessel packed with shape-stabilized phase change (solid-liquid) material (PCM) are investigated numerically by solving the governing equations of both the PCM and the heat transfer medium(water) simultaneously as a conjugate problem with the finite difference technique. It's found that the heat storage characteristics are greatly affected by the flow direction of the heat transfer medium since the natural and forced convection coexists in the heat storage vessel. That is, it is classified that the effectively thermal efficiency of the latent heat storage system is obtained by the downflow along vertical PCM for heat storage process and the upflow for heat release process. The effect of the inlet velocity of heat transfer medium(water) on transient heat characteristics of the latent heat storage system is also revealed in the present study. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1995-03-27 |
| Volume | volume29 |
| Issue | issue2 |
| Start Page | 5 |
| End Page | 12 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307377 |
| JaLCDOI | 10.18926/15410 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_26_1_9.pdf |
| Author | Uno, Yoshiyuki| Nakajima, Toshikatsu| Okada Minoru| |
| Abstract | Practical utilization of ram type electrical discharge machining in uninflammable fluid has been expected in place of inflammable kerosine type fluid for unmanned operation in a workshop. The electrical discharge machining performance in deionized water is experimentally investigated on the basis of the analysis of the crater generated by a single pulse discharge. The experimental analysis makes it clear that the electrical discharge machining performance in deionized water is greatly affected by the electrode polarity. The metal removal rate in the normal polarity machining is higher than that in reverse polarity machining, while the electrode wear rate in the normal polarity machining is greater than that in reverse polarity machining. Therefore the electrode polarity should be properly selected according to the purpose of machining. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1991-11-30 |
| Volume | volume26 |
| Issue | issue1 |
| Start Page | 9 |
| End Page | 20 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307319 |
| JaLCDOI | 10.18926/15411 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_29_2_13.pdf |
| Author | Dwianto Gatot| Osaki, Hirokazu| Kajihara, Yasuhiro| |
| Abstract | We propose a method to design the supplying method of parts to an assembly line. Three types of supplying model (Serial, Parallel, and Mixed) are proposed based on the relation between the area of part and that of the transportation equipment. The part is supplied by the pallet on which the all parts of one product are arranged or by the lot of one part. AGV or conveyor are used to transport the pallet. The supplying model is evaluated from the total transportation cost calculated from the price of the transportation equipment and of land. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1995-03-27 |
| Volume | volume29 |
| Issue | issue2 |
| Start Page | 13 |
| End Page | 21 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307903 |
| JaLCDOI | 10.18926/15412 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_26_1_21.pdf |
| Author | Nozu, Shigeru| Inaba, Hideo| |
| Abstract | A numerical study is performed for the facilitated diffusion of carbon-dioxide in an ultrapure water film flowing downward along a vertical surface. The model adopted for the present work includes the effects of the reaction rate for the hydration of CO(2)in a liquid. Comparison of the total concentration of CO(2) for different film thickness indicates that the effects of the hydration is more remarkable for the thinner liquid film. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1991-11-30 |
| Volume | volume26 |
| Issue | issue1 |
| Start Page | 21 |
| End Page | 26 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307958 |
| JaLCDOI | 10.18926/15413 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_29_2_23.pdf |
| Author | Kajihara, Yasuhiro| Osaki, Hirokazu| Dong Rui| |
| Abstract | A method for reducing the variety of parts is proposed. The variety of parts in a product and the variety of parts among products are evaluated in consideration of some factors that influence the production cost. Rules are formulated for selecting parts which should be eliminated or whose designs should be changed to reduce these varieties. An expert system is developed based on this method for reducing the variety of parts. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1995-03-27 |
| Volume | volume29 |
| Issue | issue2 |
| Start Page | 23 |
| End Page | 27 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307257 |
| JaLCDOI | 10.18926/15414 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_26_1_27.pdf |
| Author | Tomita, Eiji| Nsunge Felix Chintu| Hamamoto, Yoshisuke| |
| Abstract | Distributions of hydrogen gas concentration in a suddenly started, single shot hydrogen gas jet issuing from a 1 mm diameter injector into still air were measured using laser interferometry method. This unsteady, turbulent free jet flow has also been calculated using the two-equation, high Reynolds number version of k-ε turbulence model and hybrid scheme for treating combined diffusion and convection in the SIMPLE algorithm. The injection pressure was 0.5 MPa for which predicted and measured temporal jet tip penetration distributions indicate that the jet discharged into still air at Mach 0.25. The level of agreement between present prediction and measurement is good in some regions and poor in others. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1991-11-30 |
| Volume | volume26 |
| Issue | issue1 |
| Start Page | 27 |
| End Page | 41 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307648 |
| JaLCDOI | 10.18926/15415 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_29_2_29.pdf |
| Author | Oka, Hisao| Fukuda, Takashi| |
| Abstract | In the stiffness evaluation from the skin surface, the body structure under the skin, like a bone and muscle, influences on the measurement results. The authors developed the measurement system of biomechanical impedance with applying a vibration of acoustic frequency onto the body surface. We measured the viscoelasticity of the silicone-gel model, which involves metal blocks, from the gel surface by using this system. The internal structure of model is estimated from the relation between the viscoelasticity and the distance from the gel surface to the internal block. Applying this method, the shape of ribs of the right chest are estimated. The shapes and viscoelasticity of silicone-gel tumor model, which has two different tumors, are also estimated. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1995-03-27 |
| Volume | volume29 |
| Issue | issue2 |
| Start Page | 29 |
| End Page | 37 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307199 |
| JaLCDOI | 10.18926/15416 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_26_1_43.pdf |
| Author | Bouzidi, Moncef| Koga, Ryuji| Wada, Osami| Kagawa, Naoki| Hai Xu| Kosaka, Megumi| Sano HIroya| |
| Abstract | A numerical technique called as "adjoint spectrum" has been proposed by the authors in a previous work. Two applications of it are presented here. It is demonstrated that by generalizing the aspect of adjoint spectrum it becomes possible to measure densities of mixed gases simultaneously. An experimental proof of this has been carried on and simultaneous measurement of densities of both methane and dinitrogen oxide was realized. On the other hand, it is also reported that frequency shifting of spectra, which is a cause of error in spectrometric measurements, can be corrected by exploiting the adjoint spectrum technique in connection with the Taylor expansion. Numerical examples showing the success of this method are reported as well. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1991-11-30 |
| Volume | volume26 |
| Issue | issue1 |
| Start Page | 43 |
| End Page | 49 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307796 |
| JaLCDOI | 10.18926/15417 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_29_2_39.pdf |
| Author | Oka, Hisao| Sakamoto, Shun-ya| Irie Takashi| |
| Abstract | The body structures under the skin surface, such as bones and tendon, have an influence on the stiffness evaluation observed from the surface. In this case, the observed stiffness should be called an apparent stiffness. To obtain the biomechanical properties of skin itself, the influence of body structure should be removed. This study deals with the correction method of apparent viscoelasticity which calculated from apparent biomechanical impedance. This method is applied to the measured result of the forearm and the right chest to confirm its effectiveness. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1995-03-27 |
| Volume | volume29 |
| Issue | issue2 |
| Start Page | 39 |
| End Page | 47 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307527 |
| JaLCDOI | 10.18926/15418 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_26_1_51.pdf |
| Author | Totsuji, Hiroo| Shirokoshi Hideki| Nara, Shigetoshi| |
| Abstract | Variable shape molecular dynamics is formulated for the one-component plasma and the structural transition from the fcc lattice to the bcc lattice has been observed. It is emphasized that the condition of constant volume should be imposed when deformations of periodic boundary conditions are taken into account. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1991-11-30 |
| Volume | volume26 |
| Issue | issue1 |
| Start Page | 51 |
| End Page | 59 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307555 |
| JaLCDOI | 10.18926/15419 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_29_2_49.pdf |
| Author | Ahmed, Anis| Taniguchi, Shinji| Wada, Osami| Wang, Ming| Koga, Ryuji| |
| Abstract | For weakly guiding dielectric waveguides, the eigenmode field distributions are calculated numerically with a simple algorithm. In this numerical method, the transverse sampling space can be chosen arbitrarily, and hence a narrow waveguide can be analyzed. The field satisfying scalar wave equation is expressed by the discrete Fourier transform and the mode eigenvalues and eigenfunctions are calculated by solving an eigenvalue equation numerically. The validity of this method is checked for 2-D waveguides having step and parabolic or square index distributions. It is found that for the well guided TE modes of the slab waveguide, the accuracy of this method is remarkably good, but some discrepancies are found if the mode is near cut off. In the problems where the normalized guide index b is small, caution should be taken in applying the results of this numerical method. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1995-03-27 |
| Volume | volume29 |
| Issue | issue2 |
| Start Page | 49 |
| End Page | 55 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307858 |
| JaLCDOI | 10.18926/15420 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_26_1_61.pdf |
| Author | Kawara, Osami| Danno Hideki| Kunimatsu Takao| |
| Abstract | Lake Biwa is the largest lake in Japan, and one of the most important fresh water resources. The Hino River is the fourth largest river among the rivers which flow into Lake Biwa. The eutrophication of the lake has been warned since the 1960s. In order to improve the water quality of the lake, to decrease the loads through rivers is inevitable. Therefore, it is needed to predict the effects of measures to control pollutant loads and the influence of development in the basin on the loads from rivers before developing the basin and taking measures. This paper deals mainly with the model of water quality management for the Hino River and the effects of the development in the basin on the water quality. The model was formulated considering loads from forests, rice paddy fields, households, housing land, industrial factories. Using this model, a calculation system by a microcomputer was developed and the influence of urbanization of the basin was discussed. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1991-11-30 |
| Volume | volume26 |
| Issue | issue1 |
| Start Page | 61 |
| End Page | 73 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307182 |
| JaLCDOI | 10.18926/15421 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_26_1_75.pdf |
| Author | Myojin Sho| Noguchi Hisahumi| Yamada Masahito| |
| Abstract | Four radials-single ring urban expressway network is priced and, simultaneously, optimized in its spatial formation under the constraint that a balance must be kept of revenue and expenditure. The model consists of three sub-models: road system, car trip generation-attraction and traffic diversion. Network performance is assessed on two criteria; trip number criterion on which the aggregate number of car trips diverted onto expressway is maximized and travel hour criterion on which the travel hours of car trips integrated over the road system; surface and expressway, is minimized. Optimization is tried by numerical calculation for some sets of parameters in the model. The results are summarized as follows; (1) simultaneous optimization of price and spatial formation of the expressway network is possible on each of criteria, (2) trip number criterion produces lower pricing and smaller network while travel hour criterion does higher pricing and larger network, (3) optimum solution lies in a delicate relation of price and spatial network formation that comes from the balance constraint. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1991-11-30 |
| Volume | volume26 |
| Issue | issue1 |
| Start Page | 75 |
| End Page | 94 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307318 |
