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2017 Fiscal Year Annual Research Report

高度データ構造的手法に基づく文字列情報処理問題の上下界解明

Research Project

Project/Area Number 17H01697
Research InstitutionKyushu University

Principal Investigator

稲永 俊介  九州大学, システム情報科学研究院, 准教授 (60448404)

Co-Investigator(Kenkyū-buntansha) 坂内 英夫  九州大学, システム情報科学研究院, 准教授 (20323644)
田部井 靖生  国立研究開発法人理化学研究所, 革新知能統合研究センター, ユニットリーダー (20589824)
Project Period (FY) 2017-04-01 – 2020-03-31
Keywordsアルゴリズム / データ構造 / 文字列データ処理
Outline of Annual Research Achievements

本研究課題の目的は, 高度データ構造的手法に基づく文字列情報処理問題の上下界解明である.すなわち,大規模文字列データに対する高速処理アルゴリズムを開発し,また,計算限界の解明にも取り組んだ.本年度は,以下に示す (A)-(D) の重要研究テーマについて,主に以下の研究成果を達成した.
(A) テキスト圧縮・圧縮テキスト処理アルゴリズム (A-1) 連長圧縮に基づくアーベル規則性の計算 (A-2) 圧縮文字列に対する Lyndon 分解計算 (A-3) LZ78系圧縮の圧縮領域計算 (A-4) 連長圧縮に基づく連計算
(B) 文字列アルゴリズムとデータ構造 (B-1) パック化文字列に対するコンパクト探索木 (B-2) 省領域 CDAWG (B-3) 最短ユニーク反復回文データ構造
(C) 文字列の規則性・繰り返し構造発見 (C-1) 線形時間スクエア計算アルゴリズム (C-2) 最長共通回文部分列アルゴリズム (C-3) αギャップ付き反復・回文計算アルゴリズム (C-4) Lyndon木の逆問題アルゴリズム (C-5) 最短ユニーク文字列問題の解の個数解析 (C-6) Lyndon分解の逆問題と列挙アルゴリズム (C-7) 連定理 (C-8) αギャップ付き反復・回文の個数の上界
(D) 文字列処理問題の下界と困難性 (D-1) 最長共通回文部分列の計算時間の下界 (D-2) 各項が異なる回文分解の NP 困難性 (D-3) LZ78系圧縮の圧縮領域計算における計算時間の下界
これらの成果はすべて,文字列に内在する組み合わせ的性質,および高度なデータ構造技術を活用することで達成された.また,これらの結果は,査読付き国際会議および査読付き国際論文誌にて発表済みである.

Current Status of Research Progress
Current Status of Research Progress

1: Research has progressed more than it was originally planned.

Reason

本年度は,主に【研究実績の概要】で述べた研究成果について,査読付き国際会議に10件,査読付き国際ジャーナルに6件の論文を発表するに至った.これらの中には,MFCS 2017 (42nd International Symposium on Mathematical Foundations of Computer Science), CPM 2017 (28th Annual Symposium on Combinatorial Pattern Matching) といった,当該分野の第1線で活躍する研究者が集う国際会議(査読付き会議録有り),SIAM Journal of Computing という理論計算機科学最高峰の国際論文誌が含まれており,質・量ともに当初の計画を上回る成果を得るに至っている.

Strategy for Future Research Activity

【現在までの進捗状況】で述べたように,これまでに,当初の計画以上の研究成果が得られている.今後も,このままの体制・方針で研究開発を行っていく予定である.

  • Research Products

    (35 results)

All 2018 2017 Other

All Int'l Joint Research (6 results) Journal Article (16 results) (of which Int'l Joint Research: 5 results,  Peer Reviewed: 16 results,  Open Access: 6 results) Presentation (11 results) (of which Int'l Joint Research: 11 results) Remarks (2 results)

  • [Int'l Joint Research] University of Helsinki/University of Tampere(フィンランド)

    • Country Name
      FINLAND
    • Counterpart Institution
      University of Helsinki/University of Tampere
  • [Int'l Joint Research] TU Dortmund/University of Kiel(ドイツ)

    • Country Name
      GERMANY
    • Counterpart Institution
      TU Dortmund/University of Kiel
  • [Int'l Joint Research] University of Warsaw/Nicolaus Copernicus University(ポーランド)

    • Country Name
      POLAND
    • Counterpart Institution
      University of Warsaw/Nicolaus Copernicus University
  • [Int'l Joint Research] University of Warwick(英国)

    • Country Name
      UNITED KINGDOM
    • Counterpart Institution
      University of Warwick
  • [Int'l Joint Research] Diego Portales University(チリ)

    • Country Name
      CHILE
    • Counterpart Institution
      Diego Portales University
  • [Int'l Joint Research]

    • # of Other Countries
      1
  • [Journal Article] A hardness result and new algorithm for the longest common palindromic subsequence problem2018

    • Author(s)
      Shunsuke Inenaga and Heikki Hyyro
    • Journal Title

      Information Processing Letters

      Volume: 129 Pages: 11~15

    • DOI

      10.1016/j.ipl.2017.08.006

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Diverse Palindromic Factorization is NP-Complete2018

    • Author(s)
      Hideo Bannai, Travis Gagie, Shunsuke Inenaga, Juha Karkkainen, Dominik Kempa, Marcin Piatkowski, Simon J. Puglisi, Shiho Sugimoto
    • Journal Title

      International Journal of Foundations of Computer Science

      Volume: 29(2) Pages: 143~163

    • DOI

      10.1142/S0129054118400014

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Shortest Unique Palindromic Substring Queries in Optimal Time2018

    • Author(s)
      Yuto Nakashima, Hiroe Inoue, Takuya Mieno, Shunsuke Inenaga, Hideo Bannai and Masayuki Takeda
    • Journal Title

      Proc. 28th International Workshop on Combinatorial Algorithms (IWOCA 2017)

      Volume: LNCS10765 Pages: 印刷中

    • Peer Reviewed
  • [Journal Article] Computing Abelian string regularities based on RLE2018

    • Author(s)
      Shiho Sugimoto, Naoki Noda, Shunsuke Inenaga, Hideo Bannai and Masayuki Takeda
    • Journal Title

      28th International Workshop on Combinatorial Algorithms (IWOCA 2017)

      Volume: LNCS10765 Pages: 印刷中

    • Peer Reviewed
  • [Journal Article] Tighter Bounds and Optimal Algorithms for All Maximal α-gapped Repeats and Palindromes2017

    • Author(s)
      Pawel Gawrychowski , Tomohiro I, Shunsuke Inenaga, Dominik Koeppl, Florin Manea
    • Journal Title

      Theory of Computing Systems

      Volume: 62 Pages: 162~191

    • DOI

      10.1007/s00224-017-9794-5

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Inferring strings from Lyndon factorization2017

    • Author(s)
      Yuto Nakashima, Takashi Okabe, Tomohiro I, Shunsuke Inenaga, Hideo Bannai, Masayuki Takeda
    • Journal Title

      Theoretical Computer Science

      Volume: 689 Pages: 147~156

    • DOI

      10.1016/j.tcs.2017.05.038

    • Peer Reviewed
  • [Journal Article] Packed Compact Tries: A Fast and Efficient Data Structure for Online String Processing2017

    • Author(s)
      Takuya Takagi, Shunsuke Inenaga, Kunihiko Sadakane, Hiroki Arimura
    • Journal Title

      IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences

      Volume: E100.A Pages: 1785~1793

    • DOI

      10.1587/transfun.E100.A.1785

    • Peer Reviewed
  • [Journal Article] The “Runs” Theorem2017

    • Author(s)
      Hideo Bannai, Tomohiro I, Shunsuke Inenaga, Yuto Nakashima, Masayuki Takeda, Kazuya Tsuruta
    • Journal Title

      SIAM Journal of Computing

      Volume: 46 Pages: 1501~1514

    • DOI

      10.1137/15M1011032

    • Peer Reviewed
  • [Journal Article] Faster STR-IC-LCS computation via RLE2017

    • Author(s)
      Keita Kuboi, Yuta Fujishige, Shunsuke Inenaga, Hideo Bannai and Masayuki Takeda
    • Journal Title

      Proc. 28th Annual Symposium on Combinatorial Pattern Matching (CPM 2017)

      Volume: - Pages: 20:1~20:12

    • DOI

      10.4230/LIPIcs.CPM.2017.20

    • Peer Reviewed / Open Access
  • [Journal Article] Computing All Distinct Squares in Linear Time for Integer Alphabets2017

    • Author(s)
      Hideo Bannai, Shunsuke Inenaga, and Dominik Koeppl
    • Journal Title

      Proc. 28th Annual Symposium on Combinatorial Pattern Matching (CPM 2017)

      Volume: - Pages: 22:1~22:18

    • DOI

      10.4230/LIPIcs.CPM.2017.22

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Tight bounds on the maximum number of shortest unique substrings2017

    • Author(s)
      Takuya Mieno, Shunsuke Inenaga, Hideo Bannai and Masayuki Takeda
    • Journal Title

      Proc. 28th Annual Symposium on Combinatorial Pattern Matching (CPM 2017)

      Volume: - Pages: 24:1~24:11

    • DOI

      10.4230/LIPIcs.CPM.2017.24

    • Peer Reviewed / Open Access
  • [Journal Article] On Reverse Engineering the Lyndon Tree2017

    • Author(s)
      Yuto Nakashima, Takuya Takagi, Shunsuke Inenaga, Hideo Bannai and Masayuki Takeda
    • Journal Title

      Proc. Prague Stringology Conference 2017 (PSC 2017)

      Volume: - Pages: 108~117

    • Peer Reviewed / Open Access
  • [Journal Article] Small-space LCE data structure with constant-time queries2017

    • Author(s)
      Yuka Tanimura, Takaaki Nishimoto, Hideo Bannai, Shunsuke Inenaga and Masayuki Takeda
    • Journal Title

      Proc. 42nd International Symposium on Mathematical Foundations of Computer Science (MFCS 2017)

      Volume: - Pages: 10:1~10:15

    • DOI

      10.4230/LIPIcs.dMFCS.2017.10

    • Peer Reviewed / Open Access
  • [Journal Article] On Two LZ78-style Grammars: Compression Bounds and Compressed-Space Computation2017

    • Author(s)
      Golnaz Badkobeh, Travis Gagie, Shunsuke Inenaga, Tomasz Kociumaka, Dmitry Kosolobov and Simon Puglisi
    • Journal Title

      Proc. 24th International Symposium on String Processing and Information Retrieval (SPIRE 2017)

      Volume: LNCS10508 Pages: 51~67

    • DOI

      10.1007/978-3-319-67428-5_5

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Linear-Size CDAWG: New Repetition-Aware Indexing and Grammar Compression2017

    • Author(s)
      Takuya Takagi, Keisuke Goto, Yuta Fujishige, Shunsuke Inenaga and Hiroki Arimura
    • Journal Title

      Proc. 24th International Symposium on String Processing and Information Retrieval (SPIRE 2017)

      Volume: LNCS10508 Pages: 304~316

    • DOI

      10.1007/978-3-319-67428-5_26

    • Peer Reviewed
  • [Journal Article] Almost Linear Time Computation of Maximal Repetitions in Run Length Encoded Strings2017

    • Author(s)
      Yuta Fujishige, Yuto Nakashima, Shunsuke Inenaga, Hideo Bannai, and Masayuki Takeda
    • Journal Title

      Proc. 28th International Symposium on Algorithms and Computation (ISAAC 2017)

      Volume: - Pages: 33:1~33:12

    • DOI

      10.4230/LIPIcs.ISAAC.2017.33

    • Peer Reviewed / Open Access
  • [Presentation] Faster STR-IC-LCS computation via RLE2017

    • Author(s)
      Keita Kuboi, Yuta Fujishige, Shunsuke Inenaga, Hideo Bannai and Masayuki Takeda
    • Organizer
      28th Annual Symposium on Combinatorial Pattern Matching (CPM 2017)
    • Int'l Joint Research
  • [Presentation] Computing All Distinct Squares in Linear Time for Integer Alphabets2017

    • Author(s)
      Hideo Bannai, Shunsuke Inenaga, and Dominik Koeppl
    • Organizer
      28th Annual Symposium on Combinatorial Pattern Matching (CPM 2017)
    • Int'l Joint Research
  • [Presentation] Tight bounds on the maximum number of shortest unique substrings2017

    • Author(s)
      Takuya Mieno, Shunsuke Inenaga, Hideo Bannai and Masayuki Takeda
    • Organizer
      28th Annual Symposium on Combinatorial Pattern Matching (CPM 2017)
    • Int'l Joint Research
  • [Presentation] Computing Abelian string regularities based on RLE2017

    • Author(s)
      Shiho Sugimoto, Naoki Noda, Shunsuke Inenaga, Hideo Bannai and Masayuki Takeda
    • Organizer
      28th International Workshop on Combinatorial Algorithms (IWOCA 2017)
    • Int'l Joint Research
  • [Presentation] Shortest Unique Palindromic Substring Queries in Optimal Time2017

    • Author(s)
      Yuto Nakashima, Hiroe Inoue, Takuya Mieno, Shunsuke Inenaga, Hideo Bannai and Masayuki Takeda
    • Organizer
      28th International Workshop on Combinatorial Algorithms (IWOCA 2017)
    • Int'l Joint Research
  • [Presentation] On Reverse Engineering the Lyndon Tree2017

    • Author(s)
      Yuto Nakashima, Takuya Takagi, Shunsuke Inenaga, Hideo Bannai and Masayuki Takeda
    • Organizer
      Prague Stringology Conference 2017 (PSC 2017)
    • Int'l Joint Research
  • [Presentation] Small-space LCE data structure with constant-time queries2017

    • Author(s)
      Yuka Tanimura, Takaaki Nishimoto, Hideo Bannai, Shunsuke Inenaga and Masayuki Takeda
    • Organizer
      42nd International Symposium on Mathematical Foundations of Computer Science (MFCS 2017)
    • Int'l Joint Research
  • [Presentation] On Two LZ78-style Grammars: Compression Bounds and Compressed-Space Computation2017

    • Author(s)
      Golnaz Badkobeh, Travis Gagie, Shunsuke Inenaga, Tomasz Kociumaka, Dmitry Kosolobov and Simon Puglisi
    • Organizer
      24th International Symposium on String Processing and Information Retrieval (SPIRE 2017)
    • Int'l Joint Research
  • [Presentation] Order preserving pattern matching on trees and DAGs2017

    • Author(s)
      Tenma Nakamura, Shunsuke Inenaga, Hideo Bannai and Masayuki Takeda
    • Organizer
      24th International Symposium on String Processing and Information Retrieval (SPIRE 2017)
    • Int'l Joint Research
  • [Presentation] Linear-size CDAWG: new repetition-aware indexing and grammar compression2017

    • Author(s)
      Takuya Takagi, Keisuke Goto, Yuta Fujishige, Shunsuke Inenaga and Hiroki Arimura
    • Organizer
      24th International Symposium on String Processing and Information Retrieval (SPIRE 2017)
    • Int'l Joint Research
  • [Presentation] Almost Linear Time Computation of Maximal Repetitions in Run Length Encoded Strings2017

    • Author(s)
      Yuta Fujishige, Yuto Nakashima, Shunsuke Inenaga, Hideo Bannai, and Masayuki Takeda
    • Organizer
      8th International Symposium on Algorithms and Computation (ISAAC 2017)
    • Int'l Joint Research
  • [Remarks] 個人研究ページ

    • URL

      https://str.i.kyushu-u.ac.jp/~inenaga/index-j.html

  • [Remarks] 研究者情報(九州大学)

    • URL

      http://hyoka.ofc.kyushu-u.ac.jp/search/details/K003385/index.html

URL: 

Published: 2018-12-17   Modified: 2022-06-10  

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