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  • Taiga Kawaguchi, Takuya Yoshino, Kouichi Hirata:
    Path Histogram Distance for Rooted Labeled Caterpillars
    Proc. 10th Asian Conference on Intelligent Information and Database Systems (ACIIDS2018)
    Lecture Notes in Artificial Intelligence (to appear)

  • Taiga Kawaguchi, Kouichi Hirata:
    Earth Mover's Distances for Rooted Labeled Unordered Trees Based on Tai Mapping Hierarchy
    Proc. 7th International Concerence on Pattern Recognition Applications and Methods (ICPRAM2018), 159-168, 2018

  • Naoya Higuchi, Yasunobu Imamura, Tetsuji Kuboyama, Kouichi Hirata, Takeshi Shinohara:
    Nearest Neighbor Search using Sketches as Quantized Images of Dimension Reduction
    Proc. 7th International Concerence on Pattern Recognition Applications and Methods (ICPRAM2018), 356-363, 2018

  • Natsuki Kiyota, Sho Shimamura, Kouichi Hirata:
    Extracting Mutually Dependednt Multisets
    Proc. 20th International Conference on Discovery Science (DS2017)
    Lecture Notes in Artificial Intelligence 10558, 267-280, 2017

  • Yasunobu Imamura, Naoya Higuchi, Tetsuji Kuboyama, Kouichi Hirata, Takeshi Shinohara:
    Pivot Selection for Dimension Reduction Using Annealing by Increasing Resampling
    Proc. Learn. Wissen. Datan. Analysen. (LADW2017), 15-24, 2017

  • 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), 234-237, 2017

  • 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), 225-228, 2017

  • Takuya Yoshino, Yuma Ishizaka, Kouichi Hirata:
    Anchored Alignment Distance between Rooted Labeled Unordered Trees
    Proc. Federated Conference on Computer Science and Information Systems (FedCSIS2017), 439-446, 2017

  • Sho Shimamura, Kouichi Hirata:
    Iterative Feature Selection Based on Binary Consistency
    Proc. 8th International Conference on E-Servise and Knowledge Manegement (ESKM2017), 396-399, 2017

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

  • Chine Sonoi, Kouichi Hirata:
    On the Populality of Evolutionary Throught in Nineteenth Century English and American Society after the Publication of The Origin of Species
    Technical Report in Department of Engineering, Oita University, Vol. 64, 2017 (in Japanese)

  • 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