{"metadata":{"_oai":{"id":"oai:ipsj.ixsq.nii.ac.jp:00217765","sets":["1164:2592:10824:10923"]},"path":["10923"],"owner":"44499","recid":"217765","title":["双方向r-index"],"pubdate":{"attribute_name":"公開日","attribute_value":"2022-05-12"},"_buckets":{"deposit":"246111c0-d7da-42b1-8460-0e311c8e5f49"},"_deposit":{"id":"217765","pid":{"type":"depid","value":"217765","revision_id":0},"owners":[44499],"status":"published","created_by":44499},"item_title":"双方向r-index","author_link":["564835","564834","564836"],"item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"双方向r-index"},{"subitem_title":"Bi-directional r-indexes","subitem_title_language":"en"}]},"item_type_id":"4","publish_date":"2022-05-12","item_4_text_3":{"attribute_name":"著者所属","attribute_value_mlt":[{"subitem_text_value":"東京大学"},{"subitem_text_value":"Center for Biotechnology and Bioengineering／University of Chile"},{"subitem_text_value":"東京大学"}]},"item_4_text_4":{"attribute_name":"著者所属(英)","attribute_value_mlt":[{"subitem_text_value":"The University of Tokyo","subitem_text_language":"en"},{"subitem_text_value":"Center for Biotechnology and Bioengineering / University of Chile","subitem_text_language":"en"},{"subitem_text_value":"The University of Tokyo","subitem_text_language":"en"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_publisher":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"情報処理学会","subitem_publisher_language":"ja"}]},"publish_status":"0","weko_shared_id":-1,"item_file_price":{"attribute_name":"Billing file","attribute_type":"file","attribute_value_mlt":[{"url":{"url":"https://ipsj.ixsq.nii.ac.jp/record/217765/files/IPSJ-AL22188002.pdf","label":"IPSJ-AL22188002.pdf"},"date":[{"dateType":"Available","dateValue":"2024-05-12"}],"format":"application/pdf","billing":["billing_file"],"filename":"IPSJ-AL22188002.pdf","filesize":[{"value":"932.4 kB"}],"mimetype":"application/pdf","priceinfo":[{"tax":["include_tax"],"price":"660","billingrole":"5"},{"tax":["include_tax"],"price":"330","billingrole":"6"},{"tax":["include_tax"],"price":"0","billingrole":"9"},{"tax":["include_tax"],"price":"0","billingrole":"44"}],"accessrole":"open_date","version_id":"df02e37a-cefa-407f-b4a3-cb6d34cc034c","displaytype":"detail","licensetype":"license_note","license_note":"Copyright (c) 2022 by the Information Processing Society of Japan"}]},"item_4_creator_5":{"attribute_name":"著者名","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"荒川, 侑馬"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Gonzalo, Navarro"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"定兼, 邦彦"}],"nameIdentifiers":[{}]}]},"item_4_source_id_9":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AN1009593X","subitem_source_identifier_type":"NCID"}]},"item_4_textarea_12":{"attribute_name":"Notice","attribute_value_mlt":[{"subitem_textarea_value":"SIG Technical Reports are nonrefereed and hence may later appear in any journals, conferences, symposia, etc."}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourceuri":"http://purl.org/coar/resource_type/c_18gh","resourcetype":"technical report"}]},"item_4_source_id_11":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"2188-8566","subitem_source_identifier_type":"ISSN"}]},"item_4_description_7":{"attribute_name":"論文抄録","attribute_value_mlt":[{"subitem_description":"反復の多い文字列を効率的に圧縮する索引は，バイオインフォマティクスやバージョン管理されたリポジトリなどの分野において有用である．Burrows-Wheeler 変換 (BWT) の連長圧縮を用いて実現される r-index はそのような索引の一種であり，BWT における run の数を r としたとき，O(r) 語の空間計算量でパターンの出現位置を高速に検索することができる．この検索は，パターンの後方探索の過程で接尾辞配列のサンプルを保持し，そのサンプルからパターンの出現位置を全て計算するアルゴリズムにより実現される．本研究では，このアルゴリズムを発展させ，パターンを双方向に拡張可能かつ，探索の任意の時点でパターンの出現位置列挙が可能である双方向 r-index(br-index) を提案する．また，数値実験により，索引サイズ，および DNA のアラインメントを模した検索クエリの速度を評価する．","subitem_description_type":"Other"}]},"item_4_description_8":{"attribute_name":"論文抄録(英)","attribute_value_mlt":[{"subitem_description":"Indexing highly repetitive texts is important in fields such as bioinformatics and versioned repositories. The run-length compression of the Burrows-Wheeler transform (BWT) provides a compressed representation particularly well-suited to text indexing. The r-index is one such index. It enables fast locating of occurrences of a pattern within O(r) words of space, where r is the number of equal-letter runs in the BWT. Its mechanism of locating is to maintain one suffix array sample along the backward-search of the pattern, and to compute all the pattern positions from that sample once the backward-search is complete. In this paper we develop this algorithm further, and propose a new bi-directional text index called the br-index, which supports extending the matched pattern both in forward and backward directions, and locating the occurrences of the pattern at any step of the search, within O(r+rR) words of space, where rR is the number of equal-letter runs in the BWT of the reversed text. Our experiments show that the br-index captures the long repetitions of the text, and outperforms the existing indexes in text searching allowing some mismatches except in an internal part.","subitem_description_type":"Other"}]},"item_4_biblio_info_10":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicPageEnd":"8","bibliographic_titles":[{"bibliographic_title":"研究報告アルゴリズム（AL）"}],"bibliographicPageStart":"1","bibliographicIssueDates":{"bibliographicIssueDate":"2022-05-12","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"2","bibliographicVolumeNumber":"2022-AL-188"}]},"relation_version_is_last":true,"weko_creator_id":"44499"},"id":217765,"updated":"2025-01-19T15:22:29.390555+00:00","links":{},"created":"2025-01-19T01:18:13.853491+00:00"}