著者

佐藤 一誠

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.34, no.4, pp.228-233, 2015-12-15

著者

メンデス ラウル

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.8, no.4, pp.205-208, 1989-12-15

著者

早田 邦久

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.9, no.2, pp.79-86, 1990-06-15

著者

東 恒人 大倉 充 宮沢 一哲 藤田 和人

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.2, pp.134-141, 2004-06-15

被引用文献数

3

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In this paper, the wind ripple phenomenon; specifically, its generation, growth, disappearance, and ripple pattern, are described by reference to two parameters for a small-scale region consisting of 200×200 cells, in consideration of only the saltation and surface creep of sand. The first parameter is a coefficient allocated in a region measuring 3×3 cells, and its influence on a wind ripple pattern is clarified. The second parameter incorporates shear stress, the volume that sand jumps, the volume that sand rolls, and processing frequency. The influence of these parameters on the generation, growth, and disappearance of wind ripple is clarified.

著者

田中 覚 長谷川 恭子 徐 睿 岡本 篤志

出版者

小宮山印刷工業

雑誌

シミュレーション (ISSN:02859947)

巻号頁・発行日

vol.34, no.2, pp.130-135, 2015-06

著者

高橋 大志 寺野 隆雄

出版者

日鉄技術情報センタ-

雑誌

シミュレーション (ISSN:02859947)

巻号頁・発行日

vol.21, no.2, pp.133-142, 2002-06-15

参考文献数

17

被引用文献数

2

---

GARCH (Generalized Autoregressive Conditional Hetero-scedasticity) is a macro level model to estimate the volatility of financial markets. Prospect theory explains micro level characteristics of decision making agents in socio-psychology. Although both concepts are very fundamental in the financial and economic domain and agent-based simulation, however, there are some contradictions among the assumptions of finance theories, agents' internal states, and the behaviors of real markets. In order to bridge the two macro- and micro-level concepts, this paper develops agent-based simulation models. The model consists of simple agents with rational and/or irrational decision making functionalities for investment. The experimental results using both rational and irrational agents have shown that the behaviors of the agents with the characteristics of prospect theory coincide with the estimation by GARCH model. These results have suggested the effectiveness of the agent-based approach to the domain.

著者

宮田 義郎

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.12, no.3, pp.195-202, 1993-09-15

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Harmonic Grammar is a PDP-based approach to formal theories of linguistic well-formedness, applicable to various kinds of linguistic well-formendness, e. g., phonological and syntactic. The central hypothesis is that a measure called "harmony", defined as a function of the state of a PDP network, can be used to model linguistic well-formedness. Harmonic Grammar is a two-level theory, involving a distributed, lower level PDP network whose relevant aggregate computational behavior is described by a local, higher level network which is isoharmonic to the former. The approach is designed to incorporate insights gained from symbolic analyses into the numerical framework of PDP networks, which then allow automatic learning of grammar, as a set of soft rules, from real linguistic data. An application to a syntactic problem of unaccusativity in French showed a coverage of this problematic data greatly exceeding that of any other formal account of which we are aware.

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

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.)