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  • Natsuki Kiyota, Sho Shimamura, Kouichi Hirata:
    Extracting Mutually Dependednt Multisets
    Proc. 20th International Conference on Discovery Science (DS2017) (to appear)

  • Sho Shimamura, Kouichi Hirata:
    On the Applications of Iterative Consistency-Based Feature Selection to Nucleotide Sequences for Influenza A Viruses
    Proc. 2017 International Workshop on Smart Info-Media Systems in Asia (SISA2017) (to appear)

  • Taiga Kawaguchi, Kouichi Hirata:
    On Earth Mover's Distances Based on Complete Subtrees for Rooted Labeled Trees
    Proc. 2017 International Workshop on Smart Info-Media Systems in Asia (SISA2017) (to appear)

  • Takuya Yoshino, Yuma Ishizaka, Kouichi Hirata:
    Anchored Alignment Distance between Rooted Labeled Unordered Trees
    Proc. 10th International Workshop on Computational Optimization (WCO2017) (to appear)

  • Sho Shimamura, Kouichi Hirata:
    Iterative Feature Selection Based on Binary Consistency
    Proc. 8th International Conference on E-Servise and Knowledge Manegement (ESKM2017) (to appear)

  • Takuya Yoshino, Kouichi Hirata:
    Tai Mapping Hierarchy for Rooted Labeled Trees through Common Subforest
    Theory of Computing Systems 60, 759--787, 2017

  • Kazuki Nagayama, Kouichi Hirata, Shigeki Yokoyama, Kimiko Matsuoka:
    Extracting Propagation Patterns from Bacterial Culture Data in Medical Facility
    New Frontier in Artificial Intellligence, JSAI-isAI 2015 Workshops
    Lecture Notes in Artificial Intelligence 10091, 409--412, 2016
    (The selected paper as the post-workshop proceeding of TSDAA2015)

  • Yasunobu Imamura, Takeshi Shinohara, Kouichi Hirata, Tetsuji Kuboyama:
    Fast Hilbert Sort Algorithm without Using Hilbert Indecies
    Proc. 9th International Conference on Similarity Search and Applications (SISAP2016)
    Lecture Notes in Artificial Intelligence 9939, 259--267, 2016

  • Takuya Yoshino, Kouichi Hirata:
    Enhanced Tai Mapping for Unrooted Trees
    Proc. 2016 International Workshop on Smart Info-Media Systems in Asia (SISA2016), 6--11, 2016

  • Sho Shimamura, Kouichi Hirata:
    On Temporal and Regional Analysis for Nucleotide Sequences of Influenza A (H1N1) Viruses on Feature Selection
    Proc. 2016 International Workshop on Smart Info-Media Systems in Asia (SISA2016), 38--42, 2016

  • Kazuki Nagayama, Kouichi Hirata, Shigeki Yokoyama, Kimiko Matsuoka:
    On Extracting Propagation Patterns from Bacterial Culture Data in Medical Facility
    Proc. Workshop on Time Series Data Analysis and Its Applications (TSDAA2015), 2015

  • Kouichi Hirata, Tetsuji Kuboyama. Takuya Yoshino:
    Mapping Kernels between Rooted Labeled Trees beyond Ordered Trees
    New Frontier in Artificial Intellligence, JSAI-isAI 2014 Workshops
    Lecture Notes in Artificial Intelligence 9067, 317--330, 2015
    (The selected paper as the post-workshop proceeding of GABA2014)

  • Yuma Ishizaka, Takuya Yoshino, Kouichi Hirata:
    Anchored Alignment Problem for Rooted Labeled Trees
    New Frontier in Artificial Intellligence, JSAI-isAI 2014 Workshops
    Lecture Notes in Artificial Intelligence 9067, 296--309, 2015
    (The selected paper as the post-workshop proceeding of GABA2014)

  • Quming Jin, Masaya Nakashima, Takeshi Shinohara, Kouichi Hirata, Tetsuji Kuboyama:
    Central Point Selection for Dimension Reduction Projection Simple-Map with Binary Quantization
    New Frontier in Artificial Intellligence, JSAI-isAI 2014 Workshops
    Lecture Notes in Artificial Intelligence 9067, 310--316, 2015
    (The selected paper as the post-workshop proceeding of GABA2014)

  • Takuya Yoshino, Kouichi Hirata:
    Alignment of Cyclically Ordered Trees
    Proc. 4th International Concerence on Pattern Recognition Applications and Methods (ICPRAM2015), 263-270, 2015

  • Issei Hamada, Takaharu Shimada, Daiki Nakata, Kouichi Hirata, Tetsuji Kuboyama:
    Classifying Nucleotide Sequences and Their Positions of Influenza A Viruses through Several Kernels
    Proc. 4th International Concerence on Pattern Recognition Applications and Methods (ICPRAM2015), 342-347, 2015

  • Yohei Nasu, Naoki Kishikawa, Kei Tashima, Shin Kodama, Yasunobu Imamura, Takeshi Shinohara, Kouichi Hirata, Tetsuji Kuboyama:
    High Dimentional Similarity Search with Bundled Query Processing on Hilbert R-Tree
    Proc. 4th International Concerence on Pattern Recognition Applications and Methods (ICPRAM2015), 354-359, 2015

  • Kouichi Hirata, Tetsuji Kuboyama:
    Mapping Kernels for Cyclically Ordered Trees
    Proc. Workshop on Graph-Based Algorithms for Big Data and Its Application (GABA2014), 2014

  • Yuma Ishizaka, Takuya Yoshino, Kouichi Hirata:
    Anchored Alignment Problem for Rooted Labeled Trees
    Proc. Workshop on Graph-Based Algorithms for Big Data and Its Application (GABA2014), 2014

  • Takuya Yoshino, Kouichi Hirata:
    Alignment of Π-Ordered Trees
    Proc. Workshop on Graph-Based Algorithms for Big Data and Its Application (GABA2014), 2014

  • Issei Hamada, Kouichi Hirata, Tetsuji Kuboyama, Takaharu Shimada:
    Agreement-Subtree Mapping Kernel and Leaf-Path Kernel for Phylogenetic Trees Reconstructed from Nucleotide Sequences
    Proc. Workshop on Graph-Based Algorithms for Big Data and Its Application (GABA2014), 2014

  • Yohei Nasu, Naoki Kishikawa, Kei Tashima, Shin Kodama, Yasunobu Imamura, Takeshi Shinohara, Kouichi Hirata, Tetsuji Kuboyama:
    On Bundled Query Processing for High Dimensional Similarity Search
    Proc. Workshop on Graph-Based Algorithms for Big Data and Its Application (GABA2014), 2014

  • Quming Jin, Masaya Nakashima, Takeshi Shinohara, Kouichi Hirata, Tetsuji Kuboyama:
    Central Point Selection for Dimension Reduction Projection Simple-Map Using Binary Quantization
    Proc. Workshop on Graph-Based Algorithms for Big Data and Its Application (GABA2014), 2014

  • Tomohiro Kan, Shoichi Higuchi, Kouichi Hirata:
    Segmental Mapping and Distance between Rooted Labeled Ordered Trees
    Fundamenta Informaticae 132, 461--483, 2014

  • Yoshiyuki Yamamoto, Kouichi Hirata, Tetsuji Kuboyama:
    Tractable and Intractable Variations of Unordered Tree Edit Distance
    International Journal of Foundations of Computer Science 25, 307--330, 2014

  • Issei Hamada, Takaharu Shimada, Daiki Nakata, Kouichi Hirata, Tetsuji Kuboyama:
    Agreement Subtree Mapping Kernel for Phylogenetic Trees
    New Frontier in Artificial Intellligence, JSAI-isAI 2013 Workshops
    Lecture Notes in Artificial Intelligence 8417, 1--16. 2014

  • Takuya Yoshino, Kouichi Hirata:
    Hierarchy of Segmental and Alignable Mapping for Rooted Labeled Trees
    Proc. Workshop on Data Discretization and Segmentation for Knowledge Discovery (DDS2013), 62-69, 2013

  • Issei Hamada, Takaharu Shimada, Kouichi Hirata, Tetsuji Kuboyama:
    Agreement Subtree Mapping Kernel for Phylogenetic Trees
    Proc. Workshop on Data Discretization and Segmentation for Knowledge Discovery (DDS2013), 1-8, 2013

  • Kunihiro Wasa, Takeaki Uno, Kouichi Hirata, Hiroki Arimura:
    Polynomial Delay and Space Discovery of Connected and Acyclic Sub-Hypergraphs in a Hypergraph
    Proc. 16th International Conference on Discovery Science (DS2013)
    Lecture Notes in Artificial Intelligence 8140, 308-323, 2013

  • Kunihiro Wasa, Kouichi Hirata, Takeaki Uno, Hiroki Arimura:
    Faster Algorithm for Tree Similarity Based on Compressed Enumeration of Bounded-Sized Ordered Subtrees
    Proc. 6th International Conference on SImilarity Search and Applications (SISAP2013)
    Lecture Notes in Artificial Intelligence 8199, 73-84, 2013

  • Takaharu Shimada, Issei Hamada, Kouichi Hirata, Tetsuji Kuboyama, Kouki Yonezawa, Kimihito Ito:
    Clustering of Positions in Nucleotide Sequences by Trim Distance
    Proc. IIAI International Conference on Advanced Applied Informatics (IIAI AAI 2013), 129-134, 2013

  • Takuya Yoshino, Shoichi Higuchi, Kouichi Hirata:
    A Dynamic Programming A* Algorithm for Computing Unordered Tree Edit Distance
    Proc. IIAI International Conference on Advanced Applied Informatics (IIAI AAI 2013), 135-140, 2013

  • Masao Hattori, Keiichi Matsumoto, Noriko Sugimoto, Alireza Ahrary, Kouichi Hirata:
    Development of Flexible User Need's Investigation System Based on XML Conversions
    Proc. IIAI International Conference on Advanced Applied Informatics (IIAI AAI 2013), 125-128, 2013

  • Shoichi Higuchi, Takako Hashimoto, Tetsuji Kuboyama, Kouichi Hirata:
    Exploring Social Context from Buzz Marketing Site - Community Mapping Based on Tree Edit Distance -
    Proc. 4th International Workshop on Pervasive Collaboration and Social Networking (PerCol2013), 187-192, 2013

  • Takaharu Shimada, Shunsuke Makino, Kouichi Hirata, Kouki Yonezawa, Kimihito Ito:
    Clustering of Positions in Nucleotide Sequences by Trim Distance (abstract)
    Proc. 1st BMIRC International Symposium on Frontiers in Computational Systems Biology and Bioengineering (CSBB2013), 25-25, 2013

  • Tomohiro Kan, Shoichi Higuchi and Kouichi Hirata:
    Segmental Mapping and Distance between Rooted Labeled Ordered Trees
    Proc. 23rd International Symposium on Algorithms and Computation (ISAAC2012)
    Lecture Notes in Computer Science 7676, 485-494, 2012

  • Shunsuke Makino, Takaharu Shimada, Kouichi Hirata, Kouki Yonezawa and Kimihito Ito:
    A Trim Distance between Positions as Packaging Signals in H3N2 Influenza Viruses
    Proc. 6th International Conference on Soft Computing and Intelligent Systems
    & 13th International Symposium on Advanced Intelligent Systems
    (SCIS-ISIS2012), 1702-1707, 2012

  • Takaharu Shimada, Tatsuya Hazemoto, Shunske Makino, Kouichi Hirata and Kimihito Ito:
    Finding Correlated Mutations among RNA Segments in H3N2 Influenza Viruses
    Proc. 6th International Conference on Soft Computing and Intelligent Systems
    & 13th International Symposium on Advanced Intelligent Systems
    (SCIS-ISIS2012), 1696-1705, 2012

  • Shunsuke Makino, Takaharu Shimada, Kouichi Hirata, Kouki Yonezawa and Kimihito Ito:
    A Trim Distance between Positions in Nucleotide Sequences
    Proc. 15th International Conference on Discovery Science (DS2012)
    Lecture Notes in Artificial Intelligence 7569, 81-91, 2012

  • Takahiro Hokazono, Tomohiro Kan, Yoshiyuki Yamamoto and Kouichi Hirata:
    An Isolated-Subtree Inclusion for Unordered Trees
    Proc. IIAI International Conference on Advanced Applied Informatics (IIAI AAI 2012), 345-350, 2012

  • Noriko Sugimoto and Kouichi Hirata:
    Translating XML Documents through Dyck-Typed Regular Translation Elementary Formal Systems
    Proc. IIAI International Conference on Advanced Applied Informatics (IIAI AAI 2012), 218-223, 2012

  • Shoichi Higuchi, Tomohiro Kan, Yoshiyuki Yamamoto and Kouichi Hirata:
    An A* Algorithm for Computing Edit Distance between Rooted Labeled Unordered Trees
    New Frontiers in Artificial Intelligence: Joint JSAI-isAI 2011 Workshops
    Lecture Notes in Artificial Intelligence 7258, 186-196, 2012
    (The selected paper as the post-workshop proceeding of ALSIP2011)

  • Yoshiyuki Yamamoto, Kouichi Hirata and Tetsuji Kuboyama:
    On Computing Tractable Variations of Unordered Tree Edit Distance with Network Algorithms
    New Frontiers in Artificial Intelligence: Joint JSAI-isAI 2011 Workshops
    Lecture Notes in Artificial Intelligence 7258, 215-223, 2012
    (The selected paper as the post-workshop proceeding of ALSIP2011)


    List of Other Papers