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幾何的配置問題の計算量限界と近似可能性の研究

Research Project

Project/Area Number 16092214
Research Category

Grant-in-Aid for Scientific Research on Priority Areas

Allocation TypeSingle-year Grants
Review Section Science and Engineering
Research InstitutionKyoto University

Principal Investigator

加藤 直樹  Kyoto University, 工学研究科, 教授 (40145826)

Co-Investigator(Kenkyū-buntansha) 田村 明久  慶應義塾大学, 理工学部, 教授 (50217189)
大崎 純  京都大学, 工学研究科, 准教授 (40176855)
瀧澤 重志  京都大学, 工学研究科, 助教 (40304133)
Project Period (FY) 2004 – 2007
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥13,000,000 (Direct Cost: ¥13,000,000)
Fiscal Year 2007: ¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 2006: ¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2005: ¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2004: ¥2,700,000 (Direct Cost: ¥2,700,000)
Keywords幾何的最適化問題 / ラーマングラフ / 一様三角形メッシュ / 最短避難経路問題 / コンプライアントメカニズム / 最適避難経路問題 / テンセグリティ / 最適避難計画 / 近似アルゴリズム / 配送計画 / 構造最適化 / 計算幾何学 / 組合せ最適化 / トポロジー最適化 / 長方形検出 / 三角形メッシュ生成 / 折れ線近似
Research Abstract

1.前年度に開発した無交差ラーマングラフをすべて列挙するアルゴリズムにおいて、実用的な観点から、出力されるグラフのクラスに制限を課した列挙アルゴリズムを開発した。一つは最大次数の上限が与えられている場合で、もう一つはあらかじめ辺集合を指定し、それらを含まないグラフに限定するものである。これらは、いずれも計算困難であることが予想されるが、実用的なアルゴリズムを開発した。
2.逆探索法によって列挙された静定構造物(ラーマングラフ)に対して,節点座標と部材断面積を連続変数として,指定された性能(大変形挙動)を満たすコンプライアントメカニズムを求めた。また,節点数と計算量の関係を検討し,最適な解を求める際の計算量限界を明らかにした。
3.無交差全域木の高速列挙アルゴリズムを開発した。その計算時間の理論的性能評価とともに、計算機実験をおこない、その実用的な性能を評価した。
4.火災等の発生時における建物内部から安全な外部への最適避難経路(最大移動時間最小化問題)や、津波や大地震発生時に安全な建物・地域への最適避難経路を求める問題を考察した。実用的な観点から、格子状ネットワーク、木構造ネットワークに限定し、通路幅一定、途中での枝分かれを許さない、経路が交差しない等の制約下での最適経路群を求めた。またGISや実データを利用し、通行可能経路が確率的に定まるような実際的な問題への導入も検討した。
5.LRTなどを模した線的施設配置問題について研究した。駅と線路からなる平面上の全域木において、利用者の総移動時間を最小化するような、ネットワークのトポロジーを求めるヒューリスティクスを開発した。

Report

(4 results)
  • 2007 Annual Research Report
  • 2006 Annual Research Report
  • 2005 Annual Research Report
  • 2004 Annual Research Report
  • Research Products

    (61 results)

All 2008 2007 2006 2005 2004 Other

All Journal Article (40 results) (of which Peer Reviewed: 7 results) Presentation (19 results) Book (2 results)

  • [Journal Article] Arc-disjoint In-trees in Directed Graphs2008

    • Author(s)
      N. Kamiyama, N. Katoh, A. Takizawa,
    • Journal Title

      Proceedings of the nineteenth Annual ACM-SIAM Symposium on Discrete Algo-rithms (SODA2008)

      Pages: 518-526

    • NAID

      120002317413

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Enumerating Constrained Non-crossing Minimally Rigid Frameworks2008

    • Author(s)
      D. Avis, N. Katoh, M. Ohsaki, I. Streinu, S. Tanigawa
    • Journal Title

      Discrete & Computational Geometry

    • NAID

      120001493154

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Enumerating Non-crossing Minimally Rigid Frameworks2007

    • Author(s)
      D. Avis, N. Katoh, M. Ohsaki, I. Streinu, S. Tanigawa
    • Journal Title

      Graphs and Combina-torics 23[sup]

      Pages: 117-134

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Trinagulating a conve polygon with fewer number of non-standard bars2007

    • Author(s)
      Y. Xu, W. Dai, N. Katoh, Makoto Ohsaki
    • Journal Title

      Theoretical Computer Science 389

      Pages: 143-151

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] An E. cient Algorithm for the Evacuation Problem in a Certain Class of a Network with Uniform Path-Lengths2007

    • Author(s)
      N. Kamiyama, Naoki Katoh, Atsushi Takizawa
    • Journal Title

      Proceedings of the third International Conference on Al-gorithmic Aspect in Information and Man-agement (AAIM2007), Lecture Notes in Computer Science 4508 4508

      Pages: 178-190

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Stability conditions for tensegrity struc-tures2007

    • Author(s)
      J. Y. Zhang and M. Ohsaki
    • Journal Title

      Int. J. Solids and Struct. 44(11. 12)

      Pages: 3875-3886

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 幾何学的非線形性を考慮したトラスの形状・トポロジー最適化によるリンク機構の生成2007

    • Author(s)
      大崎純, 西脇眞二
    • Journal Title

      日本機械学会論文集A 73(729)

      Pages: 659-665

    • NAID

      110006279538

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A two-sided discrete-concave market with possibly bounded side payments : An approach by discrete convex analysis2007

    • Author(s)
      S.Fujishige, A.Tamura
    • Journal Title

      Mathematics of Operations Research 32(to appear)

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Enumerating Non-crossing Minimally Rigid Frameworks2007

    • Author(s)
      D.Avis, N.Katoh, M.Ohsaki, I.Streinu, S.Tanigawa
    • Journal Title

      Graph and Combinatorics (to appear)

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Finding a Triangular Mesh with a Constant Number of Different Edge Lengths2006

    • Author(s)
      S.Tanigawa, N.Katoh
    • Journal Title

      IEICE TRANSACTIONS on Information and Systems E89-D(8)

      Pages: 2364-2371

    • NAID

      110002812580

    • Related Report
      2006 Annual Research Report
  • [Journal Article] An Efficient algorithm for Evacuation Problem in Dynamic Network Flows with Uniform Arc Capacity2006

    • Author(s)
      N.Kamiyama, K.Naoki, A.Takizawa
    • Journal Title

      IEICE Transaction on Information and Systems E89-D(8)

      Pages: 2372-2379

    • NAID

      110007538524

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Inserting Points Uniformly at Every Instance2006

    • Author(s)
      S.Teramoto, T.Asano, B.Doerr, N.Katoh
    • Journal Title

      IEICE Transaction on Information and Systems E89-D(8)

      Pages: 2348-2356

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Polyline Fitting of Planar Points under Min-Sum Criteria2006

    • Author(s)
      B.Aronov, T.Asano, N.Katoh, K.Mehlhorn, T.Tokuyama
    • Journal Title

      International Journal of Computational Geometry & Applications 16 (2-3)

      Pages: 97-116

    • NAID

      120001479084

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Adaptive force density method for formfinding problem of tensegrity structures2006

    • Author(s)
      J.Y.Zhang, M.Ohsaki
    • Journal Title

      Int.J.Solids and Struct. 43

      Pages: 5658-5673

    • Related Report
      2006 Annual Research Report
  • [Journal Article] A general two-sided matching market with discrete concave utility functions2006

    • Author(s)
      S.Fujishige, A.Tamura
    • Journal Title

      Discrete Applied Mathematics 154

      Pages: 950-970

    • Related Report
      2006 Annual Research Report
  • [Journal Article] A direct approach to design of geometry and forces of tensegrity structures2006

    • Author(s)
      J.Zhang, M.Ohsaki, Y.Kanno
    • Journal Title

      Int.J.Solids and Struct. 43・7

      Pages: 2260-2278

    • Related Report
      2005 Annual Research Report
  • [Journal Article] 建築画像からの建築構成要素の認識手法に関する研究 ベイズ判別によるガラス開口部の認識2006

    • Author(s)
      具 源龍, 横田 隆志, 瀧澤 重志, 加藤 直樹
    • Journal Title

      日本建築学会総合論文誌 4

      Pages: 123-127

    • Related Report
      2005 Annual Research Report
  • [Journal Article] フロアプランの列挙に基づく2階建て住宅の室配置アルゴリズム2006

    • Author(s)
      神山直之, 瀧澤重志, 加藤直樹
    • Journal Title

      日本建築学会環境系論文集 601

      Pages: 65-72

    • NAID

      110004788089

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Optimal Spanners for Axis-Aligned Buildings2005

    • Author(s)
      Tetsuo Asano, Mark de Berg, Otfried, Cheong, Hazel Everett, Herman Haverkort, Naoki Katoh, Alexander Wolff
    • Journal Title

      Computational Geometry : Theory and Applications 30・1

      Pages: 59-77

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Topology optimization of trusses with stress and local constraints2005

    • Author(s)
      M.Ohsaki, N.Katoh
    • Journal Title

      Structural and Multidisciplinary Optimization 29

      Pages: 90-197

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Shape design of pin-jointed multi-stable compliant mechanisms by utilizing snapthrough behavior2005

    • Author(s)
      M.Ohsaki, S.Nishiwaki
    • Journal Title

      Structural and Multidisciplinary Optimization 30

      Pages: 327-334

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Form-finding of self-stressed structures by an extended force density method2005

    • Author(s)
      J.Zhang, M.Ohsaki
    • Journal Title

      J.Int.Assoc. for Shell and Spatial Struct. 46・3

      Pages: 159-166

    • Related Report
      2005 Annual Research Report
  • [Journal Article] An Optimization Approach to Design of Geometry and Forces of Tensegrities2005

    • Author(s)
      M.Ohsaki, J.Zhang, S.Kimura
    • Journal Title

      Proc.IASS Symposium 2005, Bucharest, Romania, Int.Assoc. Shell and Spatial Struct.

      Pages: 603-610

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Form-finding of Self-stressed Structures by an Extended Force Density Method2005

    • Author(s)
      J.Zhang, M.Ohsaki
    • Journal Title

      Proc.IASS Symposium 2005, Bucharest, Romania, Int.Assoc. Shell and Spatial Struct.

      Pages: 93-100

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Topology optimization of trusses with stress and local constraints2005

    • Author(s)
      M.Ohsaki, N.Katoh
    • Journal Title

      Proc.5th Int.Conf.on Computation of Shell and Spatial Structures, Salzburg, IASS-IACM

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Finding a triangular mesh with a constant number of different edge lengths2005

    • Author(s)
      Shin-ichi Tanigawa, Naoki Katoh
    • Journal Title

      Proc.of 17th Canadian Conference of Computational Geometry

      Pages: 271-274

    • NAID

      110002812580

    • Related Report
      2005 Annual Research Report
  • [Journal Article] 建築画像データベースの自動索引付けを目指した建築構成要素の認識手法の開発畳と格子を例として2005

    • Author(s)
      宮高泰昌, 加藤直樹, 瀧澤重志
    • Journal Title

      日本建築学会環境系論文集 588号

      Pages: 63-70

    • NAID

      110004787900

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Topology optimization of trusses with stress and local consraints2005

    • Author(s)
      M.Ohsaki, N.Katoh
    • Journal Title

      Structural and Multidisciplinary Optimization 29

      Pages: 90-197

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Efficient Algorithms and Implementations for Optimizing the Sum of Linear Fractional Functions, with Applications2005

    • Author(s)
      D.Z.Chen, O.Daescu, Y.Dai, N.Katoh, X.Wu
    • Journal Title

      Journal of Combinatorial Optimization Vol.9 No.1

      Pages: 69-90

    • Related Report
      2004 Annual Research Report
  • [Journal Article] 建築画像のデータベースに対する自動索引付けのための建築構成要素の認識手法の開発-畳と格子を例として2004

    • Author(s)
      加藤直樹, 宮高泰匡, 瀧澤重志
    • Journal Title

      日本建築学会大会学術講演梗概集 A-2

      Pages: 539-540

    • Related Report
      2004 Annual Research Report
  • [Journal Article] フロアプラン列挙に基づく二層構造物の室配置最適化手法2004

    • Author(s)
      神山直行, 瀧澤重志, 加藤直樹
    • Journal Title

      日本建築学会大会学術講演梗概集 A-2

      Pages: 559-560

    • Related Report
      2004 Annual Research Report
  • [Journal Article] 2値化エッジ画像からの高速長方形成分検出手法の開発2004

    • Author(s)
      天沼はるか, 加藤直樹
    • Journal Title

      日本建築学会環境系論文集 586号

      Pages: 83-90

    • Related Report
      2004 Annual Research Report
  • [Journal Article] スナップスルーを利用したバイステーブルコンプライアントメカニズムの形状設計法2004

    • Author(s)
      大崎 純, 西脇眞二
    • Journal Title

      日本機械学会論文集A 70(700)

      Pages: 23-28

    • NAID

      110004998886

    • Related Report
      2004 Annual Research Report
  • [Journal Article] On Geometric Structure of Global Roundings for Graphs and Range Spaces}2004

    • Author(s)
      Tetsuo Asano, Naoki Katoh, Hisao Tamaki, Takeshi Tokuyama
    • Journal Title

      Proc.of 9th Scandinavian Workshop on Algorithm Theory LNCS 3111,Springer

      Pages: 455-467

    • NAID

      110002812013

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Efficient Algorithms for Approximating a Multi-Dimensional Voxel Terrain by a Unimodal Terrain2004

    • Author(s)
      Danny Z.Chen, Jinhee Chun, Naoki Katoh, Takeshi Tokuyama
    • Journal Title

      Proc.of 10th International Computing and Combinatorics Conference(COCOON 2004) LNCS 3106,Springer

      Pages: 238-248

    • Related Report
      2004 Annual Research Report
  • [Journal Article] A uniform triangle mesh generation of curved surfaces2004

    • Author(s)
      N.Katoh, M.Ohsaki, Y.Xu
    • Journal Title

      Proc. Third China-Japan-Korea Joint Symposium on Optimization of Structural and Mechanical Systems (CJK-OSM3)

      Pages: 759-764

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Polyline Fitting of Planar Points under Min-Sum Criteria2004

    • Author(s)
      Boris Aronov, Tetsuo Asano, Naoki Katoh, Kurt Mehlhornh他
    • Journal Title

      Proc.of 15th Symposium on Algorithms and Computations LNCS 3341,Springer Verlag

      Pages: 77-88

    • NAID

      120001479084

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Shape design of bistable compliant mechanisms by utilizing snapthrough behavior2004

    • Author(s)
      M.Ohsaki, S.Nishiwaki
    • Journal Title

      Proc.Third China-Japan-Korea Joint Symposium on Optimization of Structural and Mechanical Systems(CJK-OSM3)

      Pages: 359-364

    • NAID

      110004998886

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Optimal Spanners for Axis-Aligned Buildings

    • Author(s)
      Tetsuo Asano, Mark de Berg, Otfried Cheong, Naoki Katoh他
    • Journal Title

      Computational Geometry : Theory and Applications (発表予定)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] An Approximation Algorithm for the Pickup and Delivery Vehicle Routing Problem on Trees}

    • Author(s)
      Naoki Katoh, Taihei Yano
    • Journal Title

      Discrete Applied Mathematics (発表予定)

    • NAID

      120001479083

    • Related Report
      2004 Annual Research Report
  • [Presentation] Arc-disjoint In-trees in Directed Graphs2008

    • Author(s)
      N. Kamiyama, K. Naoki, A. Takizawa
    • Organizer
      日本オペレーションズ・リサーチ学会春季研究発表会
    • Place of Presentation
      京都
    • Year and Date
      2008-03-25
    • Related Report
      2007 Annual Research Report
  • [Presentation] 線的施設配置問題に関する研究2008

    • Author(s)
      田治剛有, 谷川眞一, 神山直之, 加藤直樹, 瀧澤重志
    • Organizer
      日本オペレーションズ・リサーチ学会春季研究発表会
    • Place of Presentation
      京都
    • Year and Date
      2008-03-25
    • Related Report
      2007 Annual Research Report
  • [Presentation] 内向木による有向グラフの被覆2008

    • Author(s)
      神山直之, 加藤直樹
    • Organizer
      情報処理学会第117回アルゴリズム研究会
    • Place of Presentation
      広島
    • Year and Date
      2008-03-07
    • Related Report
      2007 Annual Research Report
  • [Presentation] Topology synthesis of bistable compli-ant mechanismusing truss elements2007

    • Author(s)
      T. Kinoshita and M. Ohsaki
    • Organizer
      The 7th Int. Conf. on Optimization: Techniques and Applications (ICOTA7)
    • Place of Presentation
      Kobe
    • Year and Date
      2007-12-14
    • Related Report
      2007 Annual Research Report
  • [Presentation] Finding an optimal location of line facil-ity using evolutionary algorithm2007

    • Author(s)
      T. Taji, S. Tanigawa, N. Kamiyama, N. Katoh and A. Takizawa
    • Organizer
      Third Asian-Pasific Congress on Computational Mechanics (APCOM2007)
    • Place of Presentation
      Kyoto
    • Year and Date
      2007-12-03
    • Related Report
      2007 Annual Research Report
  • [Presentation] Arc-disjoint In-trees in Directed Graphs2007

    • Author(s)
      N. Kamiyama, K. Naoki, A. Takizawa
    • Organizer
      情報処理学会第115回アルゴリズム研究会
    • Place of Presentation
      新潟
    • Year and Date
      2007-11-30
    • Related Report
      2007 Annual Research Report
  • [Presentation] Arc-disjoint In-trees in Directed Graphs2007

    • Author(s)
      N. Kamiyama, K. Naoki, A. Takizawa
    • Organizer
      日本オペレーションズ・リサーチ学会研究部会「コンピュテーション」2007年度 第3回研究会
    • Place of Presentation
      京都
    • Year and Date
      2007-10-12
    • Related Report
      2007 Annual Research Report
  • [Presentation] Theoretical and Practical Issues of Evacu-ation Planningin Urban Areas2007

    • Author(s)
      N. Kamiyama, K. Naoki, A. Takizawa
    • Organizer
      スケジューリング・シンポジウム 2007
    • Place of Presentation
      京都
    • Year and Date
      2007-09-29
    • Related Report
      2007 Annual Research Report
  • [Presentation] Theoretical and Practical Issues of Evac-uation Planning in Urban Areas2007

    • Author(s)
      N. Kamiyama, K. Naoki, A. Takizawa
    • Organizer
      The 8th Hellenic European Research on Computer Mathematics & Conference its Applications (HERCMA 2007)
    • Place of Presentation
      Greece
    • Year and Date
      2007-09-20
    • Related Report
      2007 Annual Research Report
  • [Presentation] 線的施設配置問題に関する研究2007

    • Author(s)
      田治剛有, 谷川眞一, 加藤直樹, 瀧澤重志
    • Organizer
      日本応用数理学会年会
    • Place of Presentation
      札幌
    • Year and Date
      2007-09-17
    • Related Report
      2007 Annual Research Report
  • [Presentation] 単一パス長ネットワークにおける避難計画問題に対する効率的なアルゴリズム2007

    • Author(s)
      神山直之, 加藤直樹, 瀧澤重志
    • Organizer
      日本建築学会大会(九州)
    • Place of Presentation
      福岡
    • Year and Date
      2007-08-31
    • Related Report
      2007 Annual Research Report
  • [Presentation] 線的施設配置問題に関する基礎研究2007

    • Author(s)
      田治剛有, 谷川眞一, 加藤直樹, 瀧澤重志
    • Organizer
      日本建築学会大会(九州)
    • Place of Presentation
      福岡
    • Year and Date
      2007-08-31
    • Related Report
      2007 Annual Research Report
  • [Presentation] 静定トラス列挙アルゴリズムを利用したコンプライアンとメカニズムの生成2007

    • Author(s)
      木下拓也, 大崎純, 加藤直樹, 谷川眞一
    • Organizer
      日本建築学会大会(九州)
    • Place of Presentation
      福岡
    • Year and Date
      2007-08-31
    • Related Report
      2007 Annual Research Report
  • [Presentation] 幾何学制約付きのテンセグリティ構造形状決定法2007

    • Author(s)
      張景耀, 大崎純
    • Organizer
      日本建築学会大会(九州)
    • Place of Presentation
      福岡
    • Year and Date
      2007-08-31
    • Related Report
      2007 Annual Research Report
  • [Presentation] An Efficient Algorithm for the Evacuation Problem in a Certain Class of Networks with Uniform Path-Lengths2007

    • Author(s)
      N. Kamiyama, K. Naoki, A. Takizawa
    • Organizer
      The sixth international Colloquium on Graphs and Optimization (GO VI)
    • Place of Presentation
      Switzerland
    • Year and Date
      2007-08-19
    • Related Report
      2007 Annual Research Report
  • [Presentation] Enumerating Constrained Non-crossing Geometric Spanning Trees2007

    • Author(s)
      N. Katoh and S. Tanigawa
    • Organizer
      The 13th International Computing and Combinatorics Conference
    • Place of Presentation
      Canada
    • Year and Date
      2007-07-17
    • Related Report
      2007 Annual Research Report
  • [Presentation] Generalization of Theorem of Edmonds2007

    • Author(s)
      N. Kamiyama, N. Katoh and A. Takizawa
    • Organizer
      Kyoto International Con-ference on Computational Geometry and Graph Theory (KyotoCGGT2007)
    • Place of Presentation
      Kyoto
    • Year and Date
      2007-06-15
    • Related Report
      2007 Annual Research Report
  • [Presentation] Optimization methods for force and shape design of tensegrity structures2007

    • Author(s)
      J. Y. Zhang and M. Ohsaki
    • Organizer
      7th World Congress of Structural and Multidis-ciplinary Optimization (WCSM07)
    • Place of Presentation
      Seoul
    • Year and Date
      2007-05-21
    • Related Report
      2007 Annual Research Report
  • [Presentation] Enumeration of optimal pin-jointed bistable compliant mechanism2007

    • Author(s)
      N. Katoh, M. Ohsaki, T. Kinoshita, S. Tanigawa, D. Avis, I. Steinu
    • Organizer
      7th World Congress of Structural and Multidis-ciplinary Optimization (WCSM07)
    • Place of Presentation
      Seoul
    • Year and Date
      2007-05-21
    • Related Report
      2007 Annual Research Report
  • [Book] 数理計画法2007

    • Author(s)
      加藤直樹
    • Total Pages
      232
    • Publisher
      コロナ社
    • Related Report
      2007 Annual Research Report
  • [Book] 建築最適化への招待2005

    • Author(s)
      日本建築学会編
    • Total Pages
      167
    • Publisher
      日本建築学会
    • Related Report
      2005 Annual Research Report

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Published: 2004-04-01   Modified: 2018-03-28  

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