Hiroshi IMAI


Finding Neighbor Communities in the Web Using an Inter-Site Graph
Yasuhito ASANO  Hiroshi IMAI  Masashi TOYODA  Masaru KITSUREGAWA 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2004/09/01
Vol. E87-D  No. 9  pp. 2163-2170
Type of Manuscript: PAPER
Category: Database
Keyword: 
information retrievalWeb communityWeb site
  Summary |  Full Text:PDF (311.4KB)

Compact Encoding of the Web Graph Exploiting Various Power Distributions
Yasuhito ASANO  Tsuyoshi ITO  Hiroshi IMAI  Masashi TOYODA  Masaru KITSUREGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2004/05/01
Vol. E87-A  No. 5  pp. 1183-1184
Type of Manuscript: Special Section LETTER (Special Section on Discrete Mathematics and Its Applications)
Category: 
Keyword: 
Web graphencodingpower distributions
  Summary |  Full Text:PDF (81.6KB)

Proof for the Equivalence between Some Best-First Algorithms and Depth-First Algorithms for AND/OR Trees
Ayumu NAGAI  Hiroshi IMAI 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2002/10/01
Vol. E85-D  No. 10  pp. 1645-1653
Type of Manuscript: PAPER
Category: Artificial Intelligence, Cognitive Science
Keyword: 
AND/OR treeAO*pn-searchdf-pn
  Summary |  Full Text:PDF (263.1KB)

Fast Algorithms for k-Word Proximity Search
Kunihiko SADAKANE  Hiroshi IMAI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2001/09/01
Vol. E84-A  No. 9  pp. 2311-2318
Type of Manuscript: PAPER
Category: Algorithms and Data Structures
Keyword: 
proximity searchtext retrievalplane-sweepdivide-and-conquer
  Summary |  Full Text:PDF (264.5KB)

Improving the Speed of LZ77 Compression by Hashing and Suffix Sorting
Kunihiko SADAKANE  Hiroshi IMAI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2000/12/20
Vol. E83-A  No. 12  pp. 2689-2698
Type of Manuscript: PAPER
Category: Information Theory
Keyword: 
LZ77hashgzipsuffix sortingblock sorting
  Summary |  Full Text:PDF (498.3KB)

Variance-Based k-Clustering Algorithms by Voronoi Diagrams and Randomization
Mary INABA  Naoki KATOH  Hiroshi IMAI 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2000/06/20
Vol. E83-D  No. 6  pp. 1199-1206
Type of Manuscript: PAPER
Category: Algorithms
Keyword: 
geometric clusteringVoronoi diagramrandomization
  Summary |  Full Text:PDF (395.1KB)

Computing the Invariant Polynomials of Graphs, Networks and Matroids
Hiroshi IMAI 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2000/03/20
Vol. E83-D  No. 3  pp. 330-343
Type of Manuscript: INVITED SURVEY PAPER
Category: Algorithms for Matroids and Related Discrete Systems
Keyword: 
Tutte polynomialmatroidsimplicial complexnetwork reliabilityBDD
  Summary |  Full Text:PDF (517.8KB)

Divergence-Based Geometric Clustering and Its Underlying Discrete Proximity Structures
Hiroshi IMAI  Mary INABA 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2000/01/20
Vol. E83-D  No. 1  pp. 27-35
Type of Manuscript: INVITED PAPER (Special Issue on Surveys on Discovery Science)
Category: 
Keyword: 
unsupervised learninggeometric clusteringVoronoi diagramcomputational geometryinformation geometry
  Summary |  Full Text:PDF (353.1KB)

Computational Investigations of All-Terminal Network Reliability via BDDs
Hiroshi IMAI  Kyoko SEKINE  Keiko IMAI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1999/05/20
Vol. E82-A  No. 5  pp. 714-721
Type of Manuscript: Special Section PAPER (Special Section on Discrete Mathematics and Its Applications)
Category: 
Keyword: 
network reliabilityBDDoutput-size sensitive#P-complete
  Summary |  Full Text:PDF (589.4KB)

Finding Useful Detours in Geographical Databases
Tetsuo SHIBUYA  Hiroshi IMAI  Shigeki NISHIMURA  Hiroshi SHIMOURA  Kenji TENMOKU 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 1999/01/20
Vol. E82-D  No. 1  pp. 282-290
Type of Manuscript: PAPER
Category: Algorithm and Computational Complexity
Keyword: 
geographical databasescar navigationshortest pathsdetour query
  Summary |  Full Text:PDF (521.7KB)

Minimax Geometric Fitting of Two Corresponding Sets of Points and Dynamic Furthest Voronoi Diagrams
Keiko IMAI  Shigeo SUMINO  Hiroshi IMAI 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 1998/11/20
Vol. E81-D  No. 11  pp. 1162-1171
Type of Manuscript: PAPER
Category: Algorithm and Computational Complexity
Keyword: 
computational geometrylower envelopeslinearizationDavenport-Schinzel sequences
  Summary |  Full Text:PDF (874KB)

Counting the Number of Paths in a Graph via BDDs
Kyoko SEKINE  Hiroshi IMAI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1997/04/20
Vol. E80-A  No. 4  pp. 682-688
Type of Manuscript: Special Section PAPER (Special Section on Discrete Mathematics and Its Applications)
Category: 
Keyword: 
graphspaths#P-completeBDD
  Summary |  Full Text:PDF (621.8KB)

Geometric Algorithms for Linear Programming
Hiroshi IMAI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1993/03/20
Vol. E76-A  No. 3  pp. 259-264
Type of Manuscript: INVITED PAPER (Special Section on the 5th Karuizawa Workshop on Circuits and Systems)
Category: 
Keyword: 
computational geometrylinear programmingprune-and-searchrandomization
  Summary |  Full Text:PDF (553.2KB)

A Geometric Fitting Problem of Two Corresponding Sets of Points on a Line
Hiroshi IMAI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1991/04/20
Vol. E74-A  No. 4  pp. 665-668
Type of Manuscript: Special Section PAPER (Special Issue on Discrete Mathematics and Its Applications)
Category: 
Keyword: 
  Summary |  Full Text:PDF (289KB)

On the Polynomiality of the Multiplicative Penalty Function Method for Linear Programming and Related Inscribed Ellipsoids
Hiroshi IMAI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1991/04/20
Vol. E74-A  No. 4  pp. 669-671
Type of Manuscript: Special Section PAPER (Special Issue on Discrete Mathematics and Its Applications)
Category: 
Keyword: 
  Summary |  Full Text:PDF (185.8KB)

Finding a Maximum Weight Independent Set of a Circle Graph
Takao ASANO  Hiroshi IMAI  Akira MUKAIYAMA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1991/04/20
Vol. E74-A  No. 4  pp. 681-683
Type of Manuscript: Special Section LETTER (Special Issue on Discrete Mathematics and Its Applications)
Category: 
Keyword: 
  Summary |  Full Text:PDF (211.5KB)

Notes on the One-Dimensional Compaction Problem of LSI Layouts Viewed from Network Flow Theory and Algorithms
Hiroshi IMAI 
Publication:   IEICE TRANSACTIONS (1976-1990)
Publication Date: 1986/10/20
Vol. E69-E  No. 10  pp. 1080-1083
Type of Manuscript: PAPER
Category: Mathematics, Combinatorics and Graph Theory
Keyword: 
  Summary |  Full Text:PDF (310.2KB)