著者

黒川,隆夫

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

巻号頁・発行日

vol.13, no.1, 1994-03-15

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Two methods of describing women's two-dimensional and three-dimensional (3D) body shape, and the related simulation studies are stated. The both methods fit a shape model to surface data of a woman, and utilize the obtained model parameters for shape description. In the first method the model is derived by adaptive subdivision of the body surface into tiny subregions that approximate the surface with high precision, and its parameters are the locations of vertices of the subregions. The second method is based on a B-spline surface fitting to the body surface. The coordinates of the resulting control points are the model parameters. Average body shape can easily be given by averaging corresponding parameter values over many women. Abdominal shape change during pregnancy is represented in the principal component space of body shape and possibility of shape change simulation is stated. The body surface can be transformed into planar development through the 3D B-spline model and related to designing patterns of a brassiere. Skin structure and color are also modeled to simulate real skin texture and to map it on the 3D model surface generated by the second method.

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

巻号頁・発行日

vol.24, no.3, 2005-09-15

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

土田 陽平 齋藤 誠紀 中村 浩章 米谷 佳晃 藤原 進

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.13, no.1, pp.32-36, 2021 (Released:2021-06-15)

参考文献数

12

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福島第一原子力発電所の廃炉に伴いトリチウム水の海洋放出が検討されている.また,将来の発電技術として期待されている核融合発電では,トリチウムを燃料として用いる.そのため,トリチウムの生体への影響を詳細に解明することが求められている.我々は,ヒトDNA中の軽水素がトリチウムに置換した際に生じる壊変効果がDNAを損傷するメカニズムを,分子動力学法を用いて解明することを目指している.壊変効果の影響を理解するためには,まずDNA中の各々の軽水素について,トリチウム置換のしやすさを評価する必要がある.そこで本研究では,ヒトDNAテロメア構造のバックボーン中に存在する水素原子を対象に,トリチウム置換のしやすさの指標を得るために分子動力学計算を実施し,各水素の溶媒接触表面積を計算した.計算結果から,バックボーン中の水素原子の中ではH5の水素の溶媒接触表面積が大きいことが判明した.

著者

石田 武志

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.4, no.2, pp.51-61, 2012 (Released:2012-11-23)

参考文献数

13

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Renewable energy resources are generally unstable and affect the performance of electricity grids when they are fully connected. A distributed energy supply network system is expected to overcome the above problem. Such a system consists of a network system in which electricity and heat can be transferred between dispersion generators and the renewable energy resources and can supply stable energy to an urban district. We have constructed a self-organization model for the formation of dispersion energy network. We demonstrated that the following 2 functions can be realized by the multi-agent model which has rules for introduction of energy facilities (fuel cell cogeneration system (CGS), heat pump system (HP), photovoltaic (PV) systems and conventional system). 1) Energy exchange was achieved between neighbor houses and surplus energy was consumed in urban district. 2) “Energy colony” is formed for self-organizing.   Our simulation results indicated that stable energy exchange was possible when “Energy colony” was formed in the district. It is considered that it is possible to construct self-organization energy network in a real dynamic urban energy environment by applying the facility replacement rules determined in this study.

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

中野 博生 轟木 義一 多田野 寛人

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.15, no.2, pp.56-63, 2023 (Released:2023-09-13)

参考文献数

10

---

MPIに基づいて並列化したジョブでプロセス数が多いものを富岳で実行したときの挙動を調べた.特に,ジョブのメモリ消費量の変化に注目する.MPIプロセス数が大きい場合,MPIの初期化の実行で少なくないメモリ消費が発生,増加していく.並列化度がさらに大きくなると,ジョブは最終的にメモリ枯渇に至る.その結果我々は,富岳で全系実行を行う場合でも実現できるMPI並列数は最大で約350万であることを明らかにした.MPIの並列度数は使用する計算ノード数に応じて設定する必要があるが,富岳の大規模ジョブとして実行する場合,ユーザーのコードに明示的に記述して利用できるメモリがかなり制限されることに注意が必要であることも明らかにした.

著者

楊 陽 奈良 知恵 萩原 一郎

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.11, no.1, pp.1-13, 2019 (Released:2019-05-11)

参考文献数

20

被引用文献数

1

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In the earthquake, the helmets play an important role in protecting the head of people, so the helmet needs to be less than 300 mm×200 mm×50 mm and should be put in the emergency bag for the time being. The existing helmets can't satisfy the requirement. In order to achieve the target, a foldable helmet is inspired by Origami engineering. Based on the MHLW helmet standards, a foldable helmet consisting of accordion cover origami structure/honeycomb origami structure is applied and the impact characteristic of the foldable helmet is investigated by FEM analyses and experiments. On the basis of this new foldable origami helmet that has been confirmed in satisfying the requirements of saving and safety, in order to make the foldable origami helmet be used for infants, the RSO structure is added. Finally, the improved helmet satisfied higher safety standards and could be put in the small box at the same time.

著者

伊藤 建一

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.13, no.1, pp.1-10, 2021 (Released:2021-01-29)

参考文献数

18

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This study evaluated the signal transmission characteristics, the electromagnetic field distributions in and around the human body, and the biosafety criteria of magnetically coupled intra-body communication through computer simulation. The analyzed magnetic couplings were a normal inductive coupling (non-resonant coupling) and two types of resonant couplings. The target evaluation regions were the forearm and upper body, and we analyzed up to an inter-coil distance of 100 cm, which is considered to be the assumed human body communication range. The results of the frequency characteristics of the signal path loss, which were the same as before, revealed that the amount of signal loss for the inductive coupling was minimized between 2 and 3 MHz at each coil distance; one of the resonant couplings could improve the signal path loss by approximately 20 dB at a resonant frequency of 2 MHz. Furthermore, when the signal voltage was 1 V, the electric field strength in the body was smaller than the general environmental limit value by more than two orders of magnitude. The local specific absorption rate was smaller by approximately four orders of magnitude; thus, it was concluded that the magnetic field method is very safe for the living body.

著者

安原,幸生

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

巻号頁・発行日

vol.26, no.4, 2007-12-15

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Effective data visualization techniques are required in order to support efficient earthquake analysis. So far, earthquake analysis experts have only been able to imagine 3D structures from typical 2D expressions. However, we consider that experts would be able to understand 3D structures more acculately and efficiently by providing them with an intuitive and interactive 3D display system. We focused on immersive projection technology (IPT) systems, more specifically on the CAVE system, to develop an effective support system for earthquake data analysis. We also developed an IPT oriented bimanual input based control interface for the support system to enable intuitive user interaction with the 3D display. In addition, we implemented a support tool for estimating fault planes in the earthquake phenomenon using the Ordinary Kriging method.

著者

吉村,忍

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

巻号頁・発行日

vol.33, no.3, 2014-09-15

著者

斎藤 正敏 神田 栄三郎 川島 光郎

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

巻号頁・発行日

vol.9, no.3, pp.197-203, 1990

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We find a simple solution method to calculate the solid-liquid interface under the thermal equilibrium condition. The boundary-fitted coordinate system is used in its procedure. This method is applied to two cases, one case that the interface temperature is equal to the melting temperature and the other that the interface temperature is unequal to that. In the former case we find the criterion of interface shapes through the calculation. That is, when m_LK_L>m_SK_S, the interface is convex toward the solid, when m_LK_L=m_SK_S, it is flat and when m_LK_L<m_SK_S, it is concave where m_L, m_S are the temperature slope on the wall along the liquid and that along the solid and K_L, K_S are the heat conductivity of liquid and that of solid. In the latter case the interface shapes are obtained when the grain-boundary exists, It is found that the interface shape is determined by the contact angle between crystals, Nash's dimensionless term and the ratio of K_L and K_S.

著者

市川 知春 武田 和大 原 崇

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.13, no.2, pp.83-91, 2021 (Released:2021-08-31)

参考文献数

10

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インターネットショッピングのレビュー機能は,購入者が商品の感想や評価を記入できる機能である.購入希望者は商品レビューを読んで,事前に商品の情報を得ることができる.しかし,すべての購入者が注意深くレビューを書かないため,参考にならない商品レビューも存在する.本研究では機械学習を用いた自然言語処理にて商品レビューの解析,評価を行い,参考になる順番に並び替えを行うシステムを構築する.レビューの内容に登場する回数が多いものを学習素性とし,学習素性が商品レビューの内容に影響する重みを算出して,適切な重みを求めるように,ロジスティック回帰を用いて学習を行う.システムの評価には,クイックソートを利用した評価法であるQE法を提案する.QE法を使用することで,正しく並び替えができているかどうかの評価を行うことができた.実験の結果,提案するシステムは,高い精度で商品レビューの並び替えが行えることを確認できた.

著者

小林 知嵩 内藤 健

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.13, no.1, pp.18-22, 2021 (Released:2021-05-25)

参考文献数

9

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自然界に存在する生命分子や原子核分裂直後の粒子対のサイズ比(質量比)の必然性を解明するために,流体力学的な近似モデルを拡張した確率論的運動量保存則のモデル(Naitoh:J. of Physics, 2012)が提示された.このモデルに1次元空間でのテイラー展開を施した後に,新たな安定性概念(最弱の安定性である準安定性)を適用することで,対称および非対称なサイズ比(質量比)が共存する理由が定性的に解明された.従来,原子核分裂については,エネルギー保存則に対してなされてきたが,この新たなモデルは,3次元非定常の運動量保存則によるもので,ベクトル量(速度)も扱っており,空間次元が高いことが特徴となっており,スカラー量のエネルギー保存則と比べて,より詳細なメカニズムの解明が期待できる.著者は,更に,多次元のテイラー展開を導入して,拡張した式とすることで,生命・非生命の粒子のサイズ,質量比の頻度分布を,従来よりも正確に求めることができることを示してきた.(Kobayashi and Naitoh, JASSE, 2019)しかも,多次元のテイラー展開を施した後にあらわれる項の群を,表面力系,対流系,中間系の3種に分類することで,ウラン235の核分裂反応における原子核内部の対流の強さ(つまり,衝突させる中性子のエネルギーレベル)が,生成される原子核の質量分布に影響するメカニズムも解明してきた.本研究では,この理論を凝縮系核反応にも適用する.投入するエネルギーレベルが小さいことを元に,表面力系および中間系の2種類の項の群を用いて反応生成物の質量分布計算を行った結果,凝縮系核反応の反応生成物の質量分布について,ある程度説明することができた.

著者

川畑,正大

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

巻号頁・発行日

vol.9, no.4, 1990-12-15

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Utilizing optical fiber sensors and magnetic sensors, "DATAGLOVE" and "DATASUIT" are tools which evaluate wide ranging movements of the human body under real time. As such, they are receiving much attention as interfaces for artificial reality. At the exhibition hall, TEPIA, in Aoyama, Tokyo which has an aim of proliferating the latest in technology, the "HARP Exhibition" was held. The theme of this exhibition was "ADVANCED INTERFACES", focusing on new interface technology between man and machines. Utilizing a "DATASUIT" and "DATAGLOVE", movements of the human body are transferred to the computer as numerical data. This information is displayed, under real time, by a three dimensional CG system and a picture of animation of the movements displayed. This report focuses on this system.

著者

宮地 英生 川原 慎太郎

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.12, no.2, pp.59-67, 2020 (Released:2020-07-23)

参考文献数

26

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Visualization is an extremely important technology for exploring and presenting various physical phenomena included in the simulation results and many scientific visualization applications have been developed since the latter half of the 1980s. In recent years, virtual reality (VR) visualization, which represents physical phenomena with complicated three-dimensional (3-D) structures in stereoscopic images to further facilitate their understanding, has attracted attention with a prevalence of VR technologies. However, most of them display the visualization results, which were exported as 3-D model data from the existing visualization application, on the VR devices. For this reason, it is necessary to re-export the 3-D model data every time the visualization parameter is changed. Therefore, we have developed a framework for completing a visualization workflow such as reading simulation data and applying visualization algorithms on the game engine which has been used for the development of applications for VR devices in recent years. The framework proposed in this paper is possible to build a VR visualization application without programming by connecting the visualization module appropriately on the visual interface of the game engine.

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

巻号頁・発行日

vol.6, no.1, 1987-03-15

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.