Details of a Researcher - Fujishiro, Issei

Papers - Fujishiro, Issei

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千葉鉄也，藤代一成，竹島由里子

第３６回可視化情報シンポジウム講演論文集 (可視化情報学会) 28 ( 1 ) 79 - 82 2008.07

Research paper (conference, symposium, etc.), Joint Work

Optimizing parallel performance of streamline visualization for large distributed flow datasets

CHEN Li, FUJISHIRO Issei

Proceedings of IEEE Pacific Visualization Symposium 2008 (IEEE/Eurographics) 87-94 2008.03

Research paper (conference, symposium, etc.), Joint Work, Accepted

Parallel performance has been a challenging topic in streamline visualization for large unstructured flow datasets on parallel distributed-memory computers. It depends strongly on domain partitions. Unsuitable partitions often lead to severe load imbalance and high frequent communications among the domain partitions. To address the problem, we present an approach to flow data partitioning taking account of flow directions and features. Multilevel spectral graph bisection method is employed to reduce communication and synchronization overhead among distributed domains. Edge weights in the corresponding adjacent matrix is defined based on an anisotropic local diffusion operator which assigns strong coupling along flow direction and weak coupling orthogonal to flow. Meanwhile, the distributions of seed points and flow features such as vortex structure are also considered in partitioning so as to obtain good load balance. The
experimental results are given to show the feasibility and
effectiveness of our method.

T-Map: A topological approach to visual exploration of time-varying volume data

FUJISHIRO Issei, OTSUKA Rieko, TAKAHSHI Shigeo, TAKESHIMA Yuriko

High-Performance Computing - 6th International Symposium, ISHPC 2005, Nara, Japan, September 7-9, 2005, First International Workshop on Advanced Low Power Systems, ALPS 2006, Revised Selected Papers (Lecture Notes in Computer Sceince) (Springer-Verlag) 4759 176-190 2008.01

Research paper (conference, symposium, etc.), Joint Work, Accepted

The rapid advance in high performance computing and measurement technologies has recently made it possible to produce a stupendous amount of time-varying volume datasets in a variety of disciplines. However, there exist a few known visual exploration tools that allow us to
investigate the core of their complex dynamics effectively. In this paper, our previous approach to topological volume skeletonization is extended to capture the topological features of large-scale time-varying volume
datasets. A visual exploration tool, termed T-map, is presented, where pixel-oriented information visualization techniques are deployed so that the user can identify partial 4D spatiotemporal domains with characteristic
changes in a topological sense, prior to detailed and comprehensible volume visualization. A case study with datasets from atomic collision research is performed to illustrate the feasibility of the proposed tool.

Locating an optimal light source for volume rendering

NARAOKA Ryota, FUJISHIRO Issei, TAKAHASHI Shigeo, TAKESHIMA Yuriko

Proceedings of Image Elecrtonics and Visual Computing Workshop 2007 (Institute of Image Electronics Engineers of Japan) 2007.11

Research paper (conference, symposium, etc.), Joint Work, Accepted

Locating optimal light sources is an important task for
image synthesis because it significantly influences the
spatial perception of rendered objects. Several methods
have been proposed, which search for the optimal
location of light sources for 3D surfaces, but none has
been done for volumes. This paper presents a novel
method for finding an optimal location of a single parallel
light source for volumetric ray-casting. The method
computes the entropy of brightness distribution of
topologically-significant isosurfaces, and then utilizes a
topologically-enhanced opacity transfer function to assign
a distinct weight to each of the entropy values for the
isosurfaces to evaluate the plausible illumination entropy
for the entire volume. The light with the maximum
entropy value facilitates the observers realizing the
volume features with enriched 3D cues. Empirical
evaluation of the present method with a simple analytic
volume is also included.

GADGET/FV：流れ場の可視化アプリケーション設計支援システム

TAKESHIMA Yuriko, FUJISHIRO Issei

画像電子学会誌 (東京・画像電子学会) 36 ( 5 ) 796 - 806 2007.09

Research paper (scientific journal), Joint Work, Accepted, ISSN 0285-9831

本論文では，可視化目的から有効な可視化技法を特定する目的指向分類であるWehrendマトリックスを拡張した知識ベースを援用することによって，流れ場の可視化アプリケーション設計を支援し，既存のモジュール型可視化環境の利用を促進するシステムGADGET/FVを提案する．GADGET/FVは，ユーザの可視化スキルレベルに応じて支援内容を変化させる適応性だけでなく，作業過程の保存・再利用や，研究メモを可視化結果にリンクさせる機能をもつことによって，ユーザの視覚解析の進捗に合わせた，よりきめの細かい支援を実現している．流体解析の実例を用いて本システムの有効性を示すとともに，Robertsonらが提案する可視化システムの性能を定義する6つの要素にしたがって，本システムの性能を総合的に評価する．

可視化情報

FUJISHIRO Issei

日本機械学会誌 (日本機械学会) 110 ( 1065 ) 595 2007.08

Research paper (scientific journal), Single Work, Accepted

拡散テンソル量の力覚化

小川雄太，藤代一成，竹島由里子

第３５回可視化情報シンポジウム講演論文集 (可視化情報学会) 27 ( 1 ) 47 - 48 2007.07

Research paper (conference, symposium, etc.), Joint Work

ボリュームレンダリングおける照明の最適配置

奈良岡亮太，藤代一成，竹島由里子，高橋成雄

第３５回可視化情報シンポジウム講演論文集 (可視化情報学会) 27 ( 1 ) 45 - 46 2007.07

Research paper (conference, symposium, etc.), Joint Work

情報科学的に美しい可視化アプローチの探求

TAKESHIMA Yuriko, TAKAHASHI Shigeo, FUJISHIRO Issei

情報処理 (東京・情報処理学会) 48 ( 7 ) 766 2007.07

Research paper (scientific journal), Joint Work

協調的可視化環境：(1) 基本コンセプトとアーキテクチャ

藤代一成，竹島由里子

第３５回可視化情報シンポジウム講演論文集 (可視化情報学会) 27 ( 1 ) 39 - 40 2007.07

Research paper (conference, symposium, etc.), Joint Work

協調的可視化環境：(2) 流体融合研究におけるケーススタディ

藤代一成，竹島由里子

第３５回可視化情報シンポジウム講演論文集 (可視化情報学会) 27 ( 1 ) 41 - 42 2007.07

Research paper (conference, symposium, etc.), Joint Work

Optimization strategies using hybrid MPI+OpenMP parallelization for large-scale data visualization on Earth Simulator

Li Chen,FUJISHIRO Issei

Proceedings of International Workshop on OpenMP 2007 Beijing 104 - 115 2007.06

Research paper (international conference proceedings), Joint Work, Accepted

見せない可視化

FUJISHIRO Issei

画像電子学会誌 (東京・画像電子学会) 36 ( 3 ) 193 2007.05

Research paper (scientific journal), Single Work, Accepted, ISSN 0285-9831

協調的可視化の役割 - 応用設計とパラメタ調整のソフトウェア支援 -

FUJISHIRO Issei, TAKESHIMA Yuriko, TAKAHASHI Shigeo

画像電子学会誌 (東京・画像電子学会) 36 ( 2 ) 146-155 2007.03

Research paper (scientific journal), Joint Work, Accepted, ISSN 0285-9831

等値面の罠

FUJISHIRO Issei

画像電子学会誌 (東京・画像電子学会) 35 ( 6 ) 963-964 2006.11

Research paper (scientific journal), Single Work, Accepted, ISSN 0285-9831

ビジュアリゼーション

FUJISHIRO Issei

画像電子学会誌 (東京・画像電子学会) 35 ( 6 ) 706-708 2006.11

Research paper (scientific journal), Single Work, Accepted, ISSN 0285-9831

Collaborative Visualization: Topological approaches to parameter tweaking for informative volume rendering

FUJISHIRO Issei, TAKAHASHI Shigeo, TAKESHIMA Yuriko

Systems Modeling and Simulation: Theory and Applications, Asia Simulation Conference 2006 (Springer-Verlag, Tokyo) 1-5 2006.10

Research paper (conference, symposium, etc.), Joint Work, Accepted

Data crisis frequently arises in solving complex scientific/engineering problems. It has motivated us to develop a collaborative visualization environment which provides the users with the "serendipity" with the aid of effective data-centric parameter tweaking. To this end, we have proposed the concept of volume data mining (VDM), which takes full advantage of knowledge in the field of differential topology to explore the global structure and local features of a target 4D volume. The current VDM tools include critical point histogram; critical/representative isosurface and cross-section extractors; isosurface embedding locator; multi-dimensional transfer function designer with topological attributes; interval volume decomposer; optimal viewpoint locator; and critical timing finder. In this talk, we illustrate the effectiveness of the VDM tools with applications to real datasets from many disciplines.

Collaborative Visualization: Topological approaches to parameter tweaking for informative volume rendering

FUJISHIRO Issei,TAKAHASHI Shigeo,TAKESHIMA Yuriko

Systems Modeling and Simulation 1 - 5 2006.10

Research paper (international conference proceedings), Joint Work, Accepted

協調的可視化：応用設計とパラメタ調整のソフトウェア支援

FUJISHIRO Issei, TAKESHIMA Yuriko

京都大学学術情報メディアセンター全国共同利用版[広報] (京都大学学術情報メディアセンター) 5 ( 2 ) 11-18 2006.10

Research paper (bulletin of university, research institution), Single Work, ISSN 1347-3581

新時代のCGエンジニア向けテキストとその思想

NOMA Tsukasa, FUJISHIRO Issei, SAITO Takafumi

図学研究（日本図学会誌） (日本図学会) 40 ( 3 ) 27-28 2006.09

Research paper (scientific journal), Joint Work

財団法人画像情報教育振興協会（CG―ARTS 協会）では，平成１６年に新しいCG 教育用テキストを発行し，平成１７年秋からこれらのテキストに基づく新しい検定試験の実施を開始した．新しいテキストと検定試験は，エン
ジニア向けとクリエイター向けに分かれているが，本研究会では，編集者を代表して乃万が，エンジニア向けのテキストの概要と考え方を紹介した．

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