日本語
The University of Electro-Communications 
Graduate School of Informatics and Engineering, School of Informatics and Engineering 
Department of Computer and Network Engineering, Cluster I (Informatics and Computer Engineering) 

Professor 
TADASHI OHMORI 

Year of birth:1962  
Personal website  

Career
Graduate school of Information Systems, Univ. Electro-Communications  Professor  2010/04/01-Present 

Academic background
The University of Tokyo  Graduate School, Division of Engineering  Information Engineering Course  Doctoral program  1990/03  Completed 
The University of Tokyo  Graduate School, Division of Engineering  Information Engineering Course  Master's program  1987/03  Completed 
The University of Tokyo  Faculty of Engineering  Dept. Electrical Engineering  1985/03  Graduated 

Academic degrees
Doctor of Engineering  The University of Tokyo  1990/03 

Outlines of current research
database researches, data engineering and algorithmic issues for new ability, concepts, realization of new data- environments/systems utilizing massive data. 

Classes responsible within the university
2018  Principles of Data Engineering 2  Spring semester  Both graduate schools, IE and IS  Master's and doctoral programs  Subject in specialty 
2018  データベース(社会人特別履修プログラム・夜間)  Spring semester  Graduate, IE  Other 
2018  Algorithms 1  Fall semester  Undergraduate, daytime  Subject in specialty 
2018  Introduction to databases  Fall semester  Undergraduate, daytime  Subject in specialty 
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Current research areas
Multimedia database 
Theory of informatics 
Computer system 
Software 

Research keywords
New Query Ability and Algorithmic issues in Data Engineering 
Algorithms, Concepts, and System algorithms for New Data-Platform Systems 
Algorithmic issues of New Query Ability and Information Extraction from Massive Data, e.g. spatio-temporal data. 
new information extraction and applications from location-dependent spatio-temporal data. 

Current research subjects
New query and information-extraction ability in data engineering/database researches: design, algorithmic issues, modeling, and implementation.  1987/04-Present 
New algorithms and system issues in new data platforms  database algorithm, consistency, concurrency  1990/03-Present 
information extraction through new search abilities over real-world spatial data  information extraction, spatio-temporal data.  2015/04/01-Present  m-closest keyword search over spatial datasets and its extension towards a new spatial search engine. 
Simulation of Multi-Agent Systems by using Very Large Database.  1994/04-1998/03 
A Study on a Multi-Dimensional Web-Structure Mining System on a basis of a Multi-Dimensional Data-Cube Model.  2005/04-2012/03  (科研基盤C) 
A Study on Models and Algorithms for Massive Log Data Analysis  系列データ, 情報構造抽出.  2005/04-2007/03  (科研基盤C) 
A Study on Keyword Search over Structured Data and Graph Databases  keyword search, hybrid XML-Relational database, Graph database, graph enumeration algorithms  2008/04-2011/03 

Published books
Book, translated  J.Gray, A.Reuter,"Transaction Processing: the concept and techniques", MorganKaufmann Pub.  M.Kitsuregawa, Tadashi Ohmori, and 7 translators  Nikkei BP  277-452  2001 
Book, dictionary  Handbook of Artificial Intelligence  Masaru KITSUREGAWA, Tadashi OHMORI  Japan Society of Artificial Intelligence  1990 
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Published papers
Paper  Yes  A New Efficient Algorithm for m-Closest Spatial Keyword Search by using Priority Control and Tight Lower-Bound  Joint  Yuan Qiu, Tadashi Ohmori, Takahiko Shintani, Hideyuki Fujita  IEICE Transaction, Vol. D (to appear)  99-D/ 7, 638-651  2016/04/01 
Paper  Yes  スキップ探索を用いた不確実データからの頻出パターンの抽出  Joint  建島,新谷,大森,藤田  日本データベース学会和文論文誌  14, Article No.6-  2016/03/01  2189-0374 
Paper  Yes  Design and Evaluation of the Database System IDPS-DB on the Intellectual Distributed Processing System IDPS  Shuji HARASHIMA, Tadashi OHMORI  Transactions of IEICE, Japan, Series D.  Vol.J96-D/ No.10, 2274-2285  2013/10 
Paper  Yes  A Hybrid Hash Join Algorithm using Bucket Regrouping on MapReduce  Shigeo HIROSE, Tadashi OHMORI, Takahiko SHINTANI  Journal of the DBSJ  Vol.12/ No.1, 61-66  2013/06 
Paper  Yes  Keyword Search on both XML and Relational Data  Liru Zhang, Tadashi Ohmori, Mamoru Hoshi  Journal of Communication and Computer (ISSN1548-7709, USA)  8/ 4, 264-275  2011/04 
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Research presentations
Symposium  An Enhancement of Similarity-Join Algorithm L2AP by using Block Partitioning and Hash Join Techniques  DEIM 2018  No  Ryunosuke Yoshimua, Tadashi Ohmori,T.Shintani, H.Fujita  2018/03/05  URL 
Symposium  位置・方向情報付写真群を用いた空間を要約する経路の作成  DEIMフォーラム2016  H5-4  No  相楽翔太,藤田秀之,大森匡,新谷隆彦  2016/03/01 
Symposium  A New Search Strategy for m-Closest Keywords Query by using Dynamically-Created Grid-Partitioning over Spatial Datasets  Int'l Symposium on Cartoraphy in Internet and Ubquitous Environments 2015  Yes  Y.Qiu, H.Zhai, A.H.Dang, T.Ohmori, H.Fujita, T.Shintani  2015/03/18 
Symposium  A New Load-Distribution Algorithm for Efficient Edit-Distance Join on MapReduce  DEIM2015  No  Atsuhito KONNO, Tadashi OHMORI, Takahiko SHINTANI  2015/03/03 
Symposium  m-Closest Keyword Search over Spatial Data by using 2^n-split tree  DEIM 2013  No  Qiu, T.Ohmori, T.Shintani  2013/03 
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Awards
FIT forum 2012 paper award  An Application of Generalized R-trees to Massive Data Archive Systems  2002/09/30 
IEICE Society of Information and Systems Contribution Award  2005/03/23 
Student Paper award  A Report on Exact Top-K Keyword Search with Redundancy Elimination on Graph Databases  2010/11/13 
Session Presentation Award  A New Hybrid-Hash Join Algorithm on MapReduce platforms by using Bucket Regrouping Strategy  2013/03/05 
Student presentation award  A new algorithm of m-closest keywords query over spatial data  2014/03/13 
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Grants-in-aid for scientific research
A Research on Efficient Algorithms for Creating information-Spaces on Massive-Data Systems.  2012/04/01-2016/03/31 
A Study on Database Systems for Multi-Dimensional Web Mining  2009/04/01-2012/03/31 
データ管理システムのログデータ分析方式に関する研究  2005/04/01-2007/03/31 
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Past records of joint or funded research
イベントデータの利用技術に関する研究  2001-2001  Research commissioned by a company 
WEBマイニングに関する研究  2001-2001  Funded commissioned research 
イベントログデータの利用技術に関する研究  2002-2002  Research commissioned by a company 
イベントログデータの利用に関する研究  2003-2003  Research commissioned by a company 
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Memberships of academic societies
電子情報通信学会  1987-Present 
情報処理学会  1985-Present 
IEICE Technical Committee of Data Engineering  1987-Present 
ACM SIGMOD Japan Chapter  1998-Present 
ACM  1998-Present 
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Committee or council involvement
DEIM(データ工学と情報マネジメントフォーラム)プログラム委員  DEIMプログラム編成委員  2013/03-Present 
ACM SIGMOD Japan chapter  vice chief editor  2011/06-2015/06 
Trans. IEICE of Japan, D division, editors of special issues on data engineering, 2008-2009.  論文誌データ工学特集号編集幹事  2008/05-2010/02 
情報処理学会  データベースシステム研究会論文誌TOD編集委員  2003/04-2011/03 
ACM SIGMOD Japan Chapter  SIGMOD日本支部書記・幹事  1999-2002 
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Committee activity in the University
IS進路委員会・委員長  委員長  2015/12-2016/12 
IS教務委員会・改組対応教務委員会  委員  2015/04-2016/03 
IS教務委員会(改組対応教務委員含む)  委員長(IS側)  2014/04-2015/03 
IS入試委員会  委員長  2013/04-2014/03 
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