Takuya MIENO

Department of Computer and Network EngineeringAssistant Professor
Cluster I (Informatics and Computer Engineering)Assistant Professor

Degree

  • Ph.D., Kyushu University, Sep. 2021

Research Keyword

  • String data structures
  • string algorithms

Field Of Study

  • Informatics, Mathematical informatics
  • Informatics, Information theory

Career

  • Apr. 2022 - Present
    The University of Electro-Communications, Graduate School of Informatics and Engineering, School of Informatics and Engineering, Assistant Proofessor
  • Oct. 2021 - Mar. 2022
    北海道大学大学院情報科学研究院, 情報理工学部門, 博士研究員, Japan
  • Apr. 2020 - Sep. 2021
    日本学術振興会 特別研究員 (DC2)

Educational Background

  • Apr. 2019 - Sep. 2021
    Kyushu University, 大学院システム情報科学府, Department of Informatics, 博士後期課程, Japan
  • Apr. 2015 - Mar. 2017
    Kyushu University, 大学院システム情報科学府, Department of Informatics, Japan
  • Apr. 2011 - Mar. 2015
    Kyushu University, School of Sciences, Department of Physics, 情報理学コース, Japan

Member History

  • Jun. 2025 - Present
    九州大学大学院システム情報科学府 博士後期課程アドバイザリ委員会 委員
  • May 2025 - Present
    情報処理学会 第88回全国大会 プログラム委員
  • Apr. 2025 - Present
    情報処理学会代表会員
  • Apr. 2024 - Present
    会誌編集委員会 専門委員会 基礎・理論分野 主査, 情報処理学会
  • Apr. 2025 - Sep. 2025
    32nd International Symposium on String Processing and Information Retrieval (SPIRE 2025) Program Committee
  • May 2024 - Mar. 2025
    情報処理学会第87回全国大会 プログラム委員
  • May 2023 - Jun. 2024
    35th Annual Symposium on Combinatorial Pattern Matching (CPM 2024) Organising Committee
  • Apr. 2023 - Mar. 2024
    会誌編集委員会 専門委員会 基礎・理論分野 幹事, 情報処理学会

Award

  • Mar. 2026
    昭和62年創設、研究会およびシンポジウム発表論文の中から特に優秀な論文を選び、その発表者に授与される。平成6年度から、故山下英男先生(初代会長)から資金の寄贈をいただき、山下記念研究賞と改称。
    情報処理学会2025年度山下記念研究賞, 三重野琢也
    Japan society, Japan

Paper

  • Longest Unbordered Factors on Run-Length Encoded Strings
    Shoma Sekizaki; Takuya Mieno
    Last, SPIRE 2025, Sep. 2025, Peer-reviwed
    International conference proceedings, English
  • On the Number of MUSs Crossing a Position
    Hiroto Fujimaru; Takuya Mieno; Shunsuke Inenaga
    SPIRE 2025, Sep. 2025, Peer-reviwed
    International conference proceedings, English
  • Space-Efficient Online Computation of String Net Occurrences
    Takuya Mieno; Shunsuke Inenaga
    Lead, CPM 2025, Jun. 2025, Peer-reviwed
    International conference proceedings, English
  • Sorted Consecutive Occurrence Queries in Substrings
    Waseem Akram; Takuya Mieno
    Last, CPM 2025, Jun. 2025, Peer-reviwed
    International conference proceedings, English
  • Subsequence Matching and LCS with Segment Number Constraints
    Yuki Yonemoto; Takuya Mieno; Shunsuke Inenaga; Ryo Yoshinaka; Ayumi Shinohara
    CIAC 2025, May 2025, Peer-reviwed
    International conference proceedings
  • Computing maximal palindromes in non-standard matching models
    Takuya Mieno; Mitsuru Funakoshi; Yuto Nakashima; Shunsuke Inenaga; Hideo Bannai; Masayuki Takeda
    Lead, Information and Computation, Elsevier BV, 304, 105283-105283, May 2025, Peer-reviwed
    Scientific journal
  • Online and Offline Algorithms for Counting Distinct Closed Factors via Sliding Suffix Trees
    Takuya Mieno; Shun Takahashi; Kazuhisa Seto; Takashi Horiyama
    Lead, SOFSEM 2025, Feb. 2025, Peer-reviwed
    International conference proceedings
  • Faster and Simpler Online/Sliding Rightmost Lempel-Ziv Factorizations
    Wataru Sumiyoshi; Takuya Mieno; Shunsuke Inenaga
    SPIRE 2024, Springer Nature Switzerland, 321-335, 19 Sep. 2024, Peer-reviwed
    International conference proceedings
  • Computing Minimal Absent Words and Extended Bispecial Factors with CDAWG Space
    Shunsuke Inenaga; Takuya Mieno; Hiroki Arimura; Mitsuru Funakoshi; Yuta Fujishige
    IWOCA 2024, Springer Nature Switzerland, 327-340, 22 Jun. 2024, Peer-reviwed
    International conference proceedings
  • Computing Longest Common Subsequence Under Cartesian-Tree Matching Model.
    Taketo Tsujimoto; Hiroki Shibata; Takuya Mieno; Yuto Nakashima 0001; Shunsuke Inenaga
    IWOCA, 369-381, Jun. 2024, Peer-reviwed
    International conference proceedings
  • Computing Maximal Palindromes in Non-standard Matching Models.
    Mitsuru Funakoshi; Takuya Mieno; Yuto Nakashima 0001; Shunsuke Inenaga; Hideo Bannai; Masayuki Takeda
    IWOCA, 165-179, Jun. 2024, Peer-reviwed
    International conference proceedings
  • Shortest Cover After Edit.
    Kazuki Mitani; Takuya Mieno; Kazuhisa Seto; Takashi Horiyama
    CPM, 24-15, Jun. 2024, Peer-reviwed
    International conference proceedings
  • Linear-Time Computation of Generalized Minimal Absent Words for Multiple Strings
    Kouta Okabe; Takuya Mieno; Yuto Nakashima; Shunsuke Inenaga; Hideo Bannai
    String Processing and Information Retrieval, Springer Nature Switzerland, 331-344, 20 Sep. 2023, Peer-reviwed
    International conference proceedings
  • Finding top-k longest palindromes in substrings
    Kazuki Mitani; Takuya Mieno; Kazuhisa Seto; Takashi Horiyama
    Corresponding, Theoretical Computer Science, Elsevier BV, 114183-114183, Sep. 2023, Peer-reviwed
    Scientific journal
  • Data Structures for Computing Unique Palindromes in Static and Non-Static Strings
    Takuya Mieno; Mitsuru Funakoshi
    Lead, Algorithmica, Springer Science and Business Media LLC, 30 Aug. 2023, Peer-reviwed
    Scientific journal
  • Internal Longest Palindrome Queries in Optimal Time
    Kazuki Mitani; Takuya Mieno; Kazuhisa Seto; Takashi Horiyama
    WALCOM: Algorithms and Computation, Springer Nature Switzerland, 127-138, 13 Mar. 2023, Peer-reviwed
    International conference proceedings
  • Computing Palindromes on a Trie in Linear Time
    Takuya Mieno; Mitsuru Funakoshi; Shunsuke Inenaga
    Lead, 33rd International Symposium on Algorithms and Computation (ISAAC 2022), 248, Dec. 2022, Peer-reviwed
    International conference proceedings
  • Online Algorithms for Finding Distinct Substrings with Length and Multiple Prefix and Suffix Conditions
    Laurentius Leonard; Shunsuke Inenaga; Hideo Bannai; Takuya Mieno
    String Processing and Information Retrieval, Springer International Publishing, 24-37, 01 Nov. 2022, Peer-reviwed
    International conference proceedings
  • RePair Grammars are the Smallest Grammars for Fibonacci Words
    Takuya Mieno; Shunsuke Inenaga; Takashi Horiyama
    Lead, 33rd Annual Symposium on Combinatorial Pattern Matching (CPM 2022), 223, 26:1-26:17, 22 Jun. 2022, Peer-reviwed, False
    International conference proceedings, English
  • Cartesian Tree Subsequence Matching
    Tsubasa Oizumi; Takeshi Kai; Takuya Mieno; Shunsuke Inenaga; Hiroki Arimura
    33rd Annual Symposium on Combinatorial Pattern Matching (CPM 2022), 223, 14:1-14:18, 22 Jun. 2022, Peer-reviwed, False
    International conference proceedings, English
  • Minimal Absent Words on Run-Length Encoded Strings.
    Tooru Akagi; Kouta Okabe; Takuya Mieno; Yuto Nakashima; Shunsuke Inenaga
    CPM, 27-17, 22 Jun. 2022, Peer-reviwed
    International conference proceedings
  • Combinatorics of minimal absent words for a sliding window
    Tooru Akagi; Yuki Kuhara; Takuya Mieno; Yuto Nakashima; Shunsuke Inenaga; Hideo Bannai; Masayuki Takeda
    Theoretical Computer Science, Elsevier BV, 927, 109-119, Jun. 2022, Peer-reviwed
    Scientific journal
  • Shortest Unique Palindromic Substring Queries in Semi-dynamic Settings
    Takuya Mieno; Mitsuru Funakoshi
    Lead, Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), 13270 LNCS, 425-438, 29 May 2022, Peer-reviwed
    International conference proceedings
  • Computing Minimal Unique Substrings for a Sliding Window
    Takuya Mieno; Yuta Fujishige; Yuto Nakashima; Shunsuke Inenaga; Hideo Bannai; Masayuki Takeda
    Lead, Algorithmica, Springer Science and Business Media LLC, 84, 3, 670-693, Mar. 2022, Peer-reviwed, Abstract

    A substring u of a string T is called a minimal unique substring (MUS) of T if u occurs exactly once in T and any proper substring of u occurs at least twice in T. In this paper, we study the problem of computing MUSs for a sliding window over a given string T. We first show how the set of MUSs can change when the window slides over T. We then present an $$O(n\log \sigma ')$$-time and O(d)-space algorithm to compute MUSs for a sliding window of size d over the input string T of length n, where $$\sigma '\le d$$ is the maximum number of distinct characters in every window.
    Scientific journal
  • Palindromic trees for a sliding window and its applications
    Takuya Mieno; Kiichi Watanabe; Yuto Nakashima; Shunsuke Inenaga; Hideo Bannai; Masayuki Takeda
    Lead, Information Processing Letters, Elsevier BV, 173, 106174-106174, Jan. 2022, Peer-reviwed
    Scientific journal
  • A Separation of γ and b via Thue–Morse Words
    Hideo Bannai; Mitsuru Funakoshi; Tomohiro I; Dominik Köppl; Takuya Mieno; Takaaki Nishimoto
    String Processing and Information Retrieval, Springer International Publishing, 12944 LNCS, 167-178, Sep. 2021, Peer-reviwed
    International conference proceedings
  • On the Approximation Ratio of LZ-End to LZ77
    Takumi Ideue; Takuya Mieno; Mitsuru Funakoshi; Yuto Nakashima; Shunsuke Inenaga; Masayuki Takeda
    String Processing and Information Retrieval, Springer International Publishing, 12944 LNCS, 114-126, Sep. 2021, Peer-reviwed
    International conference proceedings
  • Minimal Unique Palindromic Substrings After Single-Character Substitution
    Mitsuru Funakoshi; Takuya Mieno
    String Processing and Information Retrieval, Springer International Publishing, 12944 LNCS, 33-46, Sep. 2021, Peer-reviwed
    International conference proceedings
  • String Sanitization Under Edit Distance: Improved and Generalized.
    Takuya Mieno; Solon P. Pissis; Leen Stougie; Michelle Sweering
    Lead, 32nd Annual Symposium on Combinatorial Pattern Matching(CPM), Schloss Dagstuhl - Leibniz-Zentrum für Informatik, 19-18, Jun. 2021, Peer-reviwed
    International conference proceedings
  • Space-efficient algorithms for computing minimal/shortest unique substrings
    Takuya Mieno; Dominik Köppl; Yuto Nakashima; Shunsuke Inenaga; Hideo Bannai; Masayuki Takeda
    Lead, Theoretical Computer Science, Elsevier BV, 845, 230-242, Dec. 2020, Peer-reviwed
    Scientific journal, English
  • Lyndon Words, the Three Squares Lemma, and Primitive Squares
    Hideo Bannai; Takuya Mieno; Yuto Nakashima
    String Processing and Information Retrieval, Springer International Publishing, 265-273, 2020, Peer-reviwed
    In book
  • Minimal Unique Substrings and Minimal Absent Words in a Sliding Window
    Takuya Mieno; Yuki Kuhara; Tooru Akagi; Yuta Fujishige; Yuto Nakashima; Shunsuke Inenaga; Hideo Bannai; Masayuki Takeda
    Lead, SOFSEM 2020: Theory and Practice of Computer Science, Springer International Publishing, 148-160, 2020, Peer-reviwed
    In book
  • Compact Data Structures for Shortest Unique Substring Queries
    Takuya Mieno; Dominik Köppl; Yuto Nakashima; Shunsuke Inenaga; Hideo Bannai; Masayuki Takeda
    Lead, String Processing and Information Retrieval, Springer International Publishing, 107-123, 2019, Peer-reviwed
    In book
  • Algorithms and combinatorial properties on shortest unique palindromic substrings
    Hiroe Inoue; Yuto Nakashima; Takuya Mieno; Shunsuke Inenaga; Hideo Bannai; Masayuki Takeda
    Journal of Discrete Algorithms, Elsevier BV, 52-53, 122-132, Sep. 2018, Peer-reviwed
    Scientific journal, English
  • Shortest Unique Palindromic Substring Queries in Optimal Time
    Yuto Nakashima; Hiroe Inoue; Takuya Mieno; Shunsuke Inenaga; Hideo Bannai; Masayuki Takeda
    Lecture Notes in Computer Science, Springer International Publishing, 397-408, 2018, Peer-reviwed
    In book
  • Tight Bounds on the Maximum Number of Shortest Unique Substrings.
    Takuya Mieno; Shunsuke Inenaga; Hideo Bannai; Masayuki Takeda
    Lead, 28th Annual Symposium on Combinatorial Pattern Matching(CPM), Schloss Dagstuhl - Leibniz-Zentrum für Informatik, 24-11, 2017, Peer-reviwed
    International conference proceedings
  • Shortest unique substring queries on run-length encoded strings
    Takuya Mieno; Shunsuke Inenaga; Hideo Bannai; Masayuki Takeda
    Lead, Leibniz International Proceedings in Informatics, LIPIcs, Schloss Dagstuhl- Leibniz-Zentrum fur Informatik GmbH, Dagstuhl Publishing, 58, 01 Aug. 2016, Peer-reviwed
    International conference proceedings, English

Lectures, oral presentations, etc.

  • Space-Efficient Online Computation of String Net Occurrences
    Takuya Mieno; Shunsuke Inenaga
    CPM 2025, Peer-reviewed
    19 Jun. 2025
    17 Jun. 2025- 19 Jun. 2025
  • 部分文字列中のトップ k 近接連続出現クエリ
    Waseem Akram; 三重野琢也
    第203回アルゴリズム研究会
    08 May 2025
    07 May 2025- 08 May 2025
  • Online and Offline Algorithms for Counting Distinct Closed Factors via Sliding Suffix Trees
    Takuya Mieno; Shun Takahashi; Kazuhisa Seto; Takashi Horiyama
    SOFSEM 2025, Peer-reviewed
    22 Jan. 2025
    20 Jan. 2025- 23 Jan. 2025
  • 閉部分文字列数え上げのためのオンライン及びオフラインアルゴリズム
    三重野琢也; 高橋駿; 脊戸和寿; 堀山 貴史
    Oral presentation, Japanese, 第200回アルゴリズム研究会
    26 Nov. 2024
    26 Nov. 2024- 27 Nov. 2024
  • Computing maximal palindromes in non-standard matching models
    Mitsuru Funakoshi; Takuya Mieno; Yuto Nakashima; Shunsuke Inenaga; Hideo Bannai; Masayuki Takeda
    IWOCA 2024, Peer-reviewed
    03 Jul. 2024
    01 Jul. 2024- 03 Jul. 2024
  • Shortest cover after edit
    Kazuki Mitani; Takuya Mieno; Kazuhisa Seto; Takashi Horiyama
    CPM 2024, Peer-reviewed
    26 Jun. 2024
    25 Jun. 2024- 27 Jun. 2024
  • 基盤的文字列索引構造の拡張とその応用
    三重野琢也
    2024年 電子情報通信学会 総合大会 COMP-AFSA学生シンポジウム, Invited
    06 Mar. 2024
  • Computing Palindromes on a Trie in Linear Time
    Takuya Mieno; Mitsuru Funakoshi; Shunsuke Inenaga
    ISAAC 2022, Peer-reviewed
    20 Dec. 2022
    19 Dec. 2022- 21 Dec. 2022
  • デカルト木部分列照合問題
    三重野琢也
    Invited oral presentation, JCCA-2022・離散数学とその応用研究集会2022, Invited
    19 Aug. 2022
    17 Aug. 2022- 19 Aug. 2022
  • RePair Grammars are the Smallest Grammars for Fibonacci Words
    Takuya Mieno; Shunsuke Inenaga; Takashi Horiyama
    CPM 2022, Peer-reviewed
    27 Jun. 2022
    27 Jun. 2022- 29 Jun. 2022
  • Shortest Unique Palindromic Substring Queries in Semi-dynamic Settings
    Takuya Mieno; Mitsuru Funakoshi
    IWOCA 2022, Peer-reviewed
    07 Jun. 2022
    07 Jun. 2022- 09 Jun. 2022

Affiliated academic society

  • Feb. 2023 - Present
    情報処理学会

Research Themes

  • 不在/稀少文字列の計算技法と一般化文字列への展開
    三重野 琢也
    日本学術振興会, 科学研究費助成事業, 電気通信大学, 若手研究, 24K20734
    Apr. 2024 - Mar. 2027
  • 文字列処理におけるNP困難問題の高速解法の追求
    三重野 琢也
    日本学術振興会, 科学研究費助成事業 学術変革領域研究(A), 電気通信大学, 学術変革領域研究(A), 23H04381
    01 Apr. 2023 - 31 Mar. 2025
  • 動的文字列処理に対するアルゴリズム技法の開発と計算限界の解明
    三重野 琢也
    日本学術振興会, 科学研究費助成事業 研究活動スタート支援, 電気通信大学, 研究活動スタート支援, 22K21273
    31 Aug. 2022 - 31 Mar. 2024
  • 最先端文字列アルゴリズム理論に基づく巨大データ解析技法
    三重野 琢也
    日本学術振興会, 科学研究費助成事業 特別研究員奨励費, 九州大学, 特別研究員奨励費, 前から読んでも後ろから読んでも同じ文字列を回文という。文字列から回文構造を発見する問題は特に生物情報科学の分野で重要視され、盛んに研究されている。 本研究期間においては、文字列中の回文構造を効率よく検出するためのデータ構造・アルゴリズムの開発を主として行った。他にも文字列圧縮アルゴリズムの性能に関する研究などを行い、以下の6つの成果を得た。 1つ目の成果は、入力文字列に対して特定の編集操作が許された設定において、ユニーク回文部分文字列を計算するアルゴリズムの提案である。ユニーク回文部分文字列とは、文字列中にちょうど一度だけ出現する回文である。本成果は国際会議 SPIRE 2021 に採択されており、さらにその結果を応用した研究成果は国際会議 IWOCA 2022 に投稿された。 2つ目の成果は、双方向マクロスキームと呼ばれる文字列圧縮形式に対する圧縮性能限界の解明である。3つ目の成果は、LZEnd 圧縮と呼ばれる文字列圧縮手法の圧縮性能に関する新たな結果の証明である。文字列圧縮手法の性能を比較・解析する研究は文字列圧縮研究の分野で近年盛んに行われており、特に2つ目の成果は同分野で注目されていた未解決問題のひとつを解決したものである。2つ目と3つ目の成果は国際会議 SPIRE 2021 に採択されている。 4つ目の成果は、RePair という文字列圧縮手法の圧縮性能に関する新たな結果の証明である。5つ目の成果は、デカルト木部分列照合問題と呼ばれる緩和された部分列照合問題に対するアルゴリズムの提案である。6つ目の成果は、圧縮表現された文字列上で、その文字列中に存在しない不在文字列を計算するアルゴリズムの提案である。上記3つの成果はいずれも国際会議 CPM 2022 に採択されている。, 20J11983
    24 Apr. 2020 - 31 Mar. 2022

Academic Contribution Activities

  • Theory of Computing Systems, reviewer
    Peer review, Jun. 2025 - Sep. 2025
  • SPIRE 2025 Program Committee
    Academic society etc, Planning etc, Apr. 2025 - Sep. 2025
  • ISAAC 2025 subreviewer
    Peer review, Jul. 2025 - Aug. 2025
  • ESA 2025 subreviewer
    Peer review, Apr. 2025 - May 2025
  • DLT 2025 subreviewer
    Peer review, Apr. 2025 - May 2025
  • DCFS 2025 subreviewer
    Peer review, Apr. 2025 - Apr. 2025
  • Information Processing Letters, reviewer
    Peer review, Nov. 2024 - Apr. 2025
  • ICALP 2025 subreviewer
    Peer review, Feb. 2025 - Mar. 2025
  • CPM 2025 subreviewer
    Peer review, Nov. 2024 - Dec. 2024
  • CPM 2024 Organising Committee
    Planning etc, 25 Jun. 2024 - 27 Jun. 2024
  • Pre-CPM 2024 summer school Co-chair
    Planning etc, 20 Jun. 2024 - 21 Jun. 2024
  • CPM 2022 subreviewer
    Peer review, 2022 - 2022
  • SPIRE 2021 subreviewer
    Peer review, 2021 - 2021
  • PSC 2019 subreviewer
    Peer review, 2019 - 2019