著者

町田 昌彦 奥村 雅彦 山田 進

出版者

日本シミュレーション学会

雑誌

シミュレーション (ISSN:02859947)

巻号頁・発行日

vol.31, no.1, pp.35-44, 2012-03-15

参考文献数

34

著者

石谷 久 伊奈 博

出版者

日本シミュレーション学会

雑誌

シミュレーション (ISSN:02859947)

巻号頁・発行日

vol.2, no.2, pp.114-121, 1983-07-15

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In a long range regional planning, it is required to realize appropriate geometrical allocations of infrastructures taking account of the population distribution and other geographical conditions in order to improve resident's conveniences or to secure minimum, living standards. For this purpose, authors developed a model for allocation of infrastructures for a district level based on numerical land informations, and presented its framework and some of applied results. In the paper, characteristics of investment allocation algorithm, which is the essential part of the model, are investigated in detail, and effects of allocating parameters on the resultant allocations for various conditions are investigated by simulation study. Allocations obtained by this algorithm and actual allocations are also compared for several facilities, and parameters to simulate the real situations are derived. In the peper, basic characteristics of the algorithm and some results of the comparative study are presented.

著者

藤野 清次 小玉 捷平 岩里 洸介

出版者

日本シミュレーション学会

雑誌

日本シミュレーション学会論文誌 (ISSN:18835031)

巻号頁・発行日

vol.7, no.4, pp.79-83, 2015 (Released:2016-01-07)

参考文献数

7

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We consider reduction of cache miss which frequently occurs in the operations of Matrix-vector multiplication in case of nonzero entries stored using CCS format of edge-type of matrix. Edge-type of matrix often appears in the filed of superposition of FEM (Finite Element Method) analysis. The efficiency of iterative method as the Conjugate Gradient method depends on both mathematical convergence rate and implementation of Matrix-vector multiplication. In this paper, we propose zigzag CCS format for the store of nonzero entries of edge-type of matrix. Through numerical experiments, we examine that the proposed zigzag CCS format works well as compared with the conventional CCS format in case of edge-type of matrix.

著者

今野 浩

出版者

日本シミュレーション学会

雑誌

シミュレーション (ISSN:02859947)

巻号頁・発行日

vol.6, no.1, pp.18-26, 1987-03-15

著者

杉本 健二 坂田 博 磯村 滋宏

出版者

日本シミュレーション学会

雑誌

シミュレーション (ISSN:02859947)

巻号頁・発行日

vol.16, no.2, pp.130-136, 1997-06-15

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Recent development in power semiconductor devices has made remarkable advances in power electronics. Among them, the gate turn-off thyristor (GTO) is one of the most important devices. And the double gate GTO has been proposed newly to realize low turn-off switching loss. Now, the computer simulation for the device is necessary to predict its characteristics. In this study, we use the finite element method and simulate switching characteristics in order to discuss the effects of double gate structure. The relations between storage time and timing of second gate pulse, second gate current, and the trade-off between on-state voltage and turn-off time were discussed.

著者

川野 聡恭 丸山 洋平

出版者

日本シミュレーション学会

雑誌

シミュレーション (ISSN:02859947)

巻号頁・発行日

vol.23, no.1, pp.36-41, 2004-03-15

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In the present paper, a simple model for electron-DNA scattering based on quantum theory is proposed. A mathematical formula for governing equations of e-DNA collisions is derived by use of the present model. A numerical code for solving the differential equations is developed. Furthermore, a simple prediction method based on the calculated total cross section is proposed for DNA double strand breaks. The comparison between the predictions and the previous experiments is made in detail for DNA double strand breaks. They are in qualitative agreement and the validity of the present model is confirmed.

著者

岸保 勘三郎

出版者

日本シミュレーション学会

雑誌

シミュレーション (ISSN:02859947)

巻号頁・発行日

vol.2, no.2, pp.69-76, 1983-07-15

著者

松浦 真也

出版者

日本シミュレーション学会

雑誌

シミュレーション (ISSN:02859947)

巻号頁・発行日

vol.26, no.2, pp.107-111, 2007-06-15

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We have developed an original method for the analysis of various time series. One of the characteristic features of our method is that it does not assume any specific time series model beforehand. Instead, we derive important qualitative properties of the given time series objectively. This kind of approach leads to the concept of "universal modeling of time series". In this article, we briefly introduce our method from the viewpoint of universal modeling and simulations.

著者

浦久保 秀俊 黒田 真也 相原 威

出版者

日本シミュレーション学会

雑誌

シミュレーション (ISSN:02859947)

巻号頁・発行日

vol.25, no.1, pp.4-12, 2006-03-15

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Recent advance in neuroscience has revealed that neurons as information processors are not point nodes, but spatially distributed units, as represented by dendritic arborization. Computer simulation is very effective for analyzing the distributed properties of neurons; however, the implementation as computer programs is quite complicated. Here, we introduce the GENESIS and NEURON simulators, which have been developed for supporting such complex neuronal simulations. We firstly address the mathematical bases for modeling spatial properties of neurons, and then explain how the NEURON/GENESIS simulator handles the properties with sample programs. At last, we show the effectiveness of the simulators by introducing our computational researches about spike timing-dependent plasticity (STDP).

著者

相知 政司 古川 達也 松尾 匡章

出版者

日本シミュレーション学会

雑誌

シミュレーション (ISSN:02859947)

巻号頁・発行日

vol.14, no.1, pp.43-51, 1995-03-15

被引用文献数

2

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According to the rapid progress in the performance of the microprocessors and their cost-down, the Engineering Work Station (EWS) and Personal Computer (PC) have been applied to the various problems in the computational mechanics. The finite element method (FEM) is the relatively popular technique of computational analyses among various numerical methods which are aided by the EWS and the PC. The FEM will require the preprocessing to discretize the analyzed domain into triangles. In the paper, we shall present the development of highly interactive and portable pre-processors for 2-D FEM analysis. The present system works on X Window System Version 11 Release 5 (X11R5) on EWSs. Since that tool makes the best use of Graphical User Interface (GUI), even a novice user can make the mesh data and visualize the calculated results readily. The high portability of this GUI is ensured because we adopted the licensefree Athena Widget set as the fundamental GUI gadgets.

著者

岡野 邦彦

出版者

日本シミュレーション学会

雑誌

シミュレーション (ISSN:02859947)

巻号頁・発行日

vol.22, no.2, pp.83-88, 2003-06-15

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A simulation for conceptual design of fusion reactors is reviewed. There are a lot of sophisticated plasma simulations for fusion research, but usually those calculation processes are rather heavy to merge into simulations for the design survey of reactor concepts. The simulation system for conceptual reactor design, described here, uses more simplified models and formulae while various constraints from physical and engineering points of view can be taken into consideration consistently.

著者

嶋田 憲司

出版者

日本シミュレーション学会

雑誌

シミュレーション (ISSN:02859947)

巻号頁・発行日

vol.12, no.1, pp.11-20, 1993-03-15

被引用文献数

14

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Automated mesh generation is a significant problem in many computer applications such as engineering analysis, computer graphics and layered manufacturing. Although various algorithms have been proposed thus far, their functionality and coverage are limited, in most cases being application-specific. This paper provides a summary of those algorithms by classifying them and pointing out unsolved problems. In reviewing them, it is clear that none sufficiently address the major problem of node placement, that is to say the locating of nodes such that they maintain a specified distance between nodes and create a mesh with minimal distortion. This paper introduces a new, physically-based approach to this problem. The method was inspired by the pattern of soap bubbles floating in liquid which gives topology and geometry similar to ideal meshes. Each mesh node is modeled as a bubble with a point mass and viscous damping. The force field exerts repelling/attracting forces between bubbles much like intermolecular van del Waals forces. The equilibrium bubble configuration is obtained by solving numerically the governing equation of motion to yield the static force balance. After the bubble locations are decided, their center points are connected by Delaunay triangulation to give a complete mesh topology.

著者

戸倉 直 萩原 一郎

出版者

日本シミュレーション学会

雑誌

シミュレーション (ISSN:02859947)

巻号頁・発行日

vol.29, no.3, pp.90-95, 2010-10-12

参考文献数

12

著者

渡部 直人 鈴木 浩 野邊 潤 三邊 考志

出版者

日本シミュレーション学会

雑誌

シミュレーション (ISSN:02859947)

巻号頁・発行日

vol.15, no.2, pp.94-97, 1996-06-15

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To evaluate the safety of transporting radioactive materials on the road tunnel, we made the risk curve, which is the cumulative probability of the heat quantity of the package. This risk curve was calculated by the simulation on the tunnel fire and the probability density function of parameters (heat generation, duration of fire and etc.)

著者

中西 俊男

出版者

日本シミュレーション学会

雑誌

シミュレーション (ISSN:02859947)

巻号頁・発行日

vol.1, pp.17-24, 1981-12-15

著者

長谷川 浩志 吉川 向 上原 広靖 川面 恵司

出版者

日本シミュレーション学会

雑誌

シミュレーション (ISSN:02859947)

巻号頁・発行日

vol.25, no.2, pp.144-155, 2006-06-15

被引用文献数

1

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In this paper, Authors proposed a hybrid meta-heuristic method for the integer optimization of multi-peak problems to support the engineering field. For the search ability of the optimal process, the proposed method did not define a traditional combination, i.e., combining global search ability and local search ability, but newly defined the combination of multi search ability (MSA), local search ability (LSA) and neighborhood optimal search ability (NOSA). For NOSA, this proposed method introduced direct search process which self-changes design variables with reflecting recognition of dependence relation among design variables automatically. The proposed method was applied to some benchmark functions to estimate its performance, and was confirmed that it improved amount of computational cost and convergence up to the optimal solution.

著者

村井 康二 林 祐司

出版者

日本シミュレーション学会

雑誌

シミュレーション (ISSN:02859947)

巻号頁・発行日

vol.25, no.4, pp.289-296, 2006-12-15

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Recently, the environmental destruction problems are international social problems. The transport systems are important elements for the conservation of the air environment. The environmental parameters are CO_2, NO_x and SO_x from the transport systems. This paper describes the effects of the reduction for CO_2, NO_x and SO_x by systematizing ship's navigation schedule planning (Eco-navigation systems: Eco-navi) which can utilize the tidal current and the wind in inland sea. The Eco-navi consists of three sub-systems: "Cell decision system", "Current calculation system", and "Wind calculation system". We define 'Cell' as the minimum unit for calculating the hours underway. The cell, latitude: 1' ×longitude: 1', has the current and wind information. We can calculate the hours underway by utilizing the current/wind effects. We calculated the hours underway for the neap tides, ligging the tides and the spring tides of 'Kobe' to 'Hesaki' by using the data of training ship Fukae Maru, and its time saving ration is 5.1%, 9.6%, and 14.8% respectively, even if we reduce the system errors (3.8%). We proposed about 5% reduction of air pollution (CO_2, NO_x, SO_x) from the vessel in inland sea.

著者

宮内 康行 桝田 道夫 清水 正亜 藤田 恵一 矢川 元基

出版者

日本シミュレーション学会

雑誌

シミュレーション (ISSN:02859947)

巻号頁・発行日

vol.2, no.2, pp.105-113, 1983-07-15

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Two advanced methods for 2-dimensional finite element analysis of natural convection were developed and explained in this paper. The one method, based on the stream function-vorticity formulation, could get rid of numerical errors and constraint of perpendicular mesh subdivision by excluding a finite difference approximation of vorticity on no-slip boundaries. The other method, besed on primitive variables and the penalty function method, could reduce the number of independent variables by excluding pressure terms from basic equations, and economize computer memories considerably. A strong stabilizing effect of upwinding was observed in both methods. These methods were successfully applied to problems of natural convection around a horizontal hot cylinder.

著者

和泉 潔

出版者

日本シミュレーション学会

雑誌

シミュレーション (ISSN:02859947)

巻号頁・発行日

vol.23, no.3, pp.183-190, 2004-09-15

被引用文献数

2

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This paper introduces an artificial market approach, a new agent-based simulation approach of financial markets, and overviews artificial market researches that test economic theories of financial markets. First, we introduce our study that rethought efficient market hypothesis from a viewpoint of complexity of market participants' prediction methods and market price's dynamics, and examined the hypothesis using simulation results of our artificial market model. Then, we review other artificial market studies. Finally, we show some future directions of artificial market studies and their requirements.

著者

姫野 信吉

出版者

日本シミュレーション学会

雑誌

シミュレーション (ISSN:02859947)

巻号頁・発行日

vol.12, no.4, pp.262-267, 1993-12-15

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The Rigid Body Spring Model (RBSM) is extended and applied to prediction of muscle contraction forces around the human hip joint. A cadaver is disected to measure weights and lenghts of its muscles. Every muscle bandle is modeled as a spring, whose stiffness is proportional to its cross-sectional area. Boundary conditions are given to solve as ordinary way of RBSM. Every muscle contraction force is given as a tensile force of its relative spring. Muscle forces and their resultant joint force vector are thus obtained quite easily. This method is expected useful to analyze locomotion systems of living bodies.