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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

  • 園井千音, 平田耕一:
    『種の起源』出版後の19世紀イギリス及びアメリカ社会における進化思想の流布について
    大分大学工学部研究報告, 第64号, 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


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