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2018 Fiscal Year Research-status Report

Lyndon文字列による簡潔で高速な文字列処理アルゴリズム

Research Project

Project/Area Number 18K18002
Research InstitutionKyushu University

Principal Investigator

中島 祐人  九州大学, システム情報科学研究院, 助教 (80804682)

Project Period (FY) 2018-04-01 – 2021-03-31
Keywords文字列処理アルゴリズム / 文字列組合せ論
Outline of Annual Research Achievements

本研究課題では,簡潔で高速な文字列処理アルゴリズム開発への新たなアプローチとして,Lyndon 文字列や Lyndon 文字列に基づいたデータ構造の未知の性質を明らかにし,それらを用いたアルゴリズム開発を目的としている.この目的のために,Lyndon文字列に関連するトピックを中心に,様々な文字列処理アルゴリズムに関する問題に取り組んだ.その結果,9報の論文を査読付き国際会議にて発表,1報の論文を査読付き国際学術雑誌にて公表している.特にこれらの成果のうち,次に示す2つの研究については,本研究課題の核となるLyndon文字列に関する重要な成果である.
1) Straight Line Program (SLP) と呼ばれる文字列の文法圧縮表現に対する高速なLyndon分解アルゴリズムの提案.
2) 1文字および1ブロック編集後の文字列における最長Lyndon部分文字列クエリに対する高速なアルゴリズムの提案.
その他の研究成果も,文法圧縮,文字列照合,接尾辞配列といった文字列情報学の中心的なトピックに関するものであり,本研究課題の目的のために重要な成果となっている.特に接尾辞配列については,Lyndon文字列と極めて関連性が高いものである.多くの研究成果が,当該分野のトップ研究者らが集まる国際会議 Combinatorial Pattern Matching (CPM) や String Processing and Information Retrieval (SPIRE) に採択された.また,その他の関連する研究テーマについてすでに成果を得ており,国際会議等での公表に向けて準備中である.

Current Status of Research Progress
Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

研究業績の概要に示したように,本研究課題の核となるLyndon文字列に関する研究成果2件を中心に,文字列処理アルゴリズムに関する研究成果が得られている.そのため,本研究課題はおおむね順調に進展しているといえる.

Strategy for Future Research Activity

先に示したように,本研究課題はここまで順調に進んでいるため,次年度も計画に基づき推し進めていく予定である.

Causes of Carryover

当初予定していた学会への参加を業務等により取りやめたため,次年度への繰越が発生した.予想を上回る研究成果が得られているため,次年度の助成金と合わせ,学会等参加の費用として使用する予定である.

  • Research Products

    (17 results)

All 2019 2018

All Journal Article (9 results) (of which Peer Reviewed: 9 results,  Open Access: 6 results) Presentation (8 results) (of which Int'l Joint Research: 8 results)

  • [Journal Article] MR-RePair: Grammar Compression based on Maximal Repeats2019

    • Author(s)
      Isamu Furuya, Takuya Takagi, Yuto Nakashima, Tomohiro I, Shunsuke Inenaga, Hideo Bannai, Takuya Kida
    • Journal Title

      Proceedings of Data Compression Conference 2019

      Volume: - Pages: 508--517

    • Peer Reviewed
  • [Journal Article] Algorithms and combinatorial properties on shortest unique palindromic substrings2018

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

      Journal of Discrete Algorithms

      Volume: 52-53 Pages: 122~132

    • DOI

      10.1016/j.jda.2018.11.009

    • Peer Reviewed
  • [Journal Article] Lyndon Factorization of Grammar Compressed Texts Revisited2018

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

      Proceedings of Annual Symposium on Combinatorial Pattern Matching 2018, LIPIcs

      Volume: 105 Pages: 24:1--24:10

    • DOI

      10.4230/LIPIcs.CPM.2018.24

    • Peer Reviewed / Open Access
  • [Journal Article] Longest Lyndon Substring After Edit2018

    • Author(s)
      Yuki Urabe, Yuto Nakashima, Shunsuke Inenaga, Hideo Bannai, Masayuki Takeda
    • Journal Title

      Proceedings of Annual Symposium on Combinatorial Pattern Matching 2018, LIPIcs

      Volume: 105 Pages: 19:1--19:10

    • DOI

      10.4230/LIPIcs.CPM.2018.19

    • Peer Reviewed / Open Access
  • [Journal Article] Longest substring palindrome after edit2018

    • Author(s)
      Mitsuru Funakoshi, Yuto Nakashima, Shunsuke Inenaga, Hideo Bannai, Masayuki Takeda
    • Journal Title

      Proceedings of Annual Symposium on Combinatorial Pattern Matching 2018, LIPIcs

      Volume: 105 Pages: 12:1--12:14

    • DOI

      10.4230/LIPIcs.CPM.2018.12

    • Peer Reviewed / Open Access
  • [Journal Article] Faster Online Elastic Degenerate String Matching2018

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

      Proceedings of Annual Symposium on Combinatorial Pattern Matching 2018, LIPIcs

      Volume: 105 Pages: 9:1--9:10

    • DOI

      10.4230/LIPIcs.CPM.2018.9

    • Peer Reviewed / Open Access
  • [Journal Article] Recovering, Counting and Enumerating Strings from Forward and Backward Suffix Arrays2018

    • Author(s)
      Yuki Kuhara, Yuto Nakashima, Shunsuke Inenaga, Hideo Bannai, Masayuki Takeda
    • Journal Title

      Proceedings of 25th International Symposium on String Processing and Information Retrieval 2018, Lecture Notes in Computer Science

      Volume: 11147 Pages: 254--267

    • DOI

      10.1007/978-3-030-00479-8\_21

    • Peer Reviewed
  • [Journal Article] O(n log n)-time text compression by LZ-style longest first substitution2018

    • Author(s)
      Akihiro Nishi, Yuto Nakashima, Shunsuke Inenaga, Hideo Bannai, Masayuki Takeda
    • Journal Title

      Proceedings of the Prague Stringology Conference 2018

      Volume: - Pages: 12--26

    • Peer Reviewed / Open Access
  • [Journal Article] Right-to-left online construction of parameterized position heaps2018

    • Author(s)
      Noriki Fujisato, Yuto Nakashima, Shunsuke Inenaga, Hideo Bannai, Masayuki Takeda
    • Journal Title

      Proceedings of the Prague Stringology Conference 2018

      Volume: - Pages: 91--102

    • Peer Reviewed / Open Access
  • [Presentation] MR-RePair: Grammar Compression based on Maximal Repeats2019

    • Author(s)
      Isamu Furuya, Takuya Takagi, Yuto Nakashima, Tomohiro I, Shunsuke Inenaga, Hideo Bannai, Takuya Kida
    • Organizer
      Data Compression Conference 2019
    • Int'l Joint Research
  • [Presentation] Lyndon Factorization of Grammar Compressed Texts Revisited2018

    • Author(s)
      Isamu Furuya, Yuto Nakashima, Tomohiro I, Shunsuke Inenaga, Hideo Bannai, Masayuki Takeda
    • Organizer
      Annual Symposium on Combinatorial Pattern Matching 2018
    • Int'l Joint Research
  • [Presentation] Longest Lyndon Substring After Edit2018

    • Author(s)
      Yuki Urabe, Yuto Nakashima, Shunsuke Inenaga, Hideo Bannai, Masayuki Takeda
    • Organizer
      Annual Symposium on Combinatorial Pattern Matching 2018
    • Int'l Joint Research
  • [Presentation] Longest substring palindrome after edit2018

    • Author(s)
      Mitsuru Funakoshi, Yuto Nakashima, Shunsuke Inenaga, Hideo Bannai, Masayuki Takeda
    • Organizer
      Annual Symposium on Combinatorial Pattern Matching 2018
    • Int'l Joint Research
  • [Presentation] Faster Online Elastic Degenerate String Matching2018

    • Author(s)
      Kotaro Aoyama, Yuto Nakashima, Tomohiro I, Shunsuke Inenaga, Hideo Bannai, Masayuki Takeda
    • Organizer
      Annual Symposium on Combinatorial Pattern Matching 2018
    • Int'l Joint Research
  • [Presentation] Recovering, Counting and Enumerating Strings from Forward and Backward Suffix Arrays2018

    • Author(s)
      Yuki Kuhara, Yuto Nakashima, Shunsuke Inenaga, Hideo Bannai, Masayuki Takeda
    • Organizer
      25th International Symposium on String Processing and Information Retrieval 2018
    • Int'l Joint Research
  • [Presentation] O(n log n)-time text compression by LZ-style longest first substitution2018

    • Author(s)
      Akihiro Nishi, Yuto Nakashima, Shunsuke Inenaga, Hideo Bannai, Masayuki Takeda
    • Organizer
      Prague Stringology Conference 2018
    • Int'l Joint Research
  • [Presentation] Right-to-left online construction of parameterized position heaps2018

    • Author(s)
      Noriki Fujisato, Yuto Nakashima, Shunsuke Inenaga, Hideo Bannai, Masayuki Takeda
    • Organizer
      Prague Stringology Conference 2018
    • Int'l Joint Research

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Published: 2019-12-27  

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