Kyushu University Academic Staff Educational and Research Activities Database
Researcher information (To researchers) Need Help? How to update
Sachio Hirokawa Last modified date:2017.08.10

Graduate School
Undergraduate School
Other Organization

Hirokawa Laboratory .
DAISEN Project(Directory Architecture for Integrated Search Engine) .
Academic Degree
Ph. D
Field of Specialization
Search Engine,Text Mining, Computational Logic
Research Interests
  • Research and Development of New Generation Search Engine with Data Map and Concept Graph
    keyword : Search Engine, Matrix Search, Concept Graph, University Venture
  • High Quality Contents Mining by Integrating Links and Semi-structures of Web Data
    keyword : Web Mining, Data Mining, WWW, XML, Document Search, Search Engine, Patent Search, Databases
  • Research and development of the next-generation search engine by dynamic integration of search sites
    keyword : Search Engine, Meta-search
    1993.04The information on WWW continues increasing explosively. It is an important problem how we utilize them in an information society now and in the future. General search engines, such as Yahoo! and Google, are expected as keys to this problem. But there is the problem with respect to the quality of a reference result. To provide information with high quality, many companies and organizations have their own search facility on their sites, which we call search sites. In this research and development, we realized a system which integrates these search sites suitable for the users' purpose. The system consists of the feature extraction system, the data management system of search sites, and the clustering system. Users can choose search sites according to the keywords which are provided by the system, or can traverse the directory for selecting the search sites. The directory mapping of the search sites are realized by comparing the feature vector of the sites and that of the node in the directory. Another core technology of the system is automatic wrapper generation. This is based on the algorithm of extraction of tag patterns from HTML files. This system can be a basis for efficient communication of high quality information, from the provider side to the consumer side. We expect that this system gives the big social impact as a next-generation search engine. The system and related documents are available at
  • Study of Inference Structure of Constructive Logics
    keyword : Proof figure, Type theory, Lambda calculus, Linear Logic, Relevant Logic, Intuitionistic Logic
Academic Activities
1. Kiyota Hashimoto, Tasanawan Soonklang, Sachio Hirokawa, Feature Words of Moves in Scientific Abstracts, Proc. 5th IIAI-AAI,, pp.749-754, 2016.08.
2. Brendan Flanagan, Sachio Hirokawa, Carita Paradis, Kiyota Hashimoto, Analysis of the diachronic relations of adjective antonym pairs in wine tasting notes, Proc. AROB2016, pp.749-754, 2016.01.
3. Brendan Flanagan, Kiyota Hashimoto, Sachio Hirokawa, Analysis of Antonymic Adjective Meaning Dimensions in Winespeak, Proc. SNLP2016, CD, 2015.12.
4. Yasuhiro Yamada, Daisuke Ikeda, Sachio Hirokawa, Unique Links as Weak Ties, Proc. AAI2015, 2015.07.
5. Brendan Flanagan, CHENGJIU YIN, Yohei Inokuchi, Sachio Hirokawa, Supporting Interpersonal Communication Using Mind-Map, Journal of Information and Systems in Education, 2013.12.
6. Eisuke Ito, Brendan Flanagan, CHENGJIU YIN, Tetsuya Nakatoh, Sachio Hirokawa, A study of search engine exercise using VM on a private cloud, Proc. ICCE2013, 2013.11.
7. Brendan Flanagan, CHENGJIU YIN, Kiyota Hashimoto, Sachio Hirokawa, Yoshiyuki Tabata, An Automated Method to Generate e-Learning Quizzes from Online Language Learner Writing, International Journal of Distance Education Technologies, 2013.11.
8. Makoto Okada, Sachio Hirokawa, Kiyota Hashimoto, An Investigation of a Method to Extract Japanese Start-Farming
Problems using Comparison News Articles and Questionnaire Surveys, Proc. AIT2013, 2013.11.
9. Brendan Flanagan, Jane Yin-Kim YAU, Sachio Hirokawa, Yoshiyuki Tabata, An SNS based Literature Review System for conducting a Research Survey, Proc. ICCE2013, 2013.11.
10. Brendan Flanagan, CHENGJIU YIN, Kiyota Hashimoto, Sachio Hirokawa, Clustering English Writing Errors based on Error Category Prediction, Proc. ISEEE2013, 2013.11.
11. Koki Miyata, Takahiko Suzuki, Sachio Hirokawa, Difficulty and Ambiguity of Verbs -Analysis based on Synsets in Japanese WordNet-, Proc. AIT2013, 2013.11.
12. Brendan Flanagan, Jun Zeng, Brendan Flanagan, Sachio Hirokawa, Extraction of Informative Blocks from Deep Web Page Using Similar Layout Feature, International Journal of Advancements in Computing Technology, 5, 9, 2013.11.
13. Eisuke Ito, Sachio Hirokawa, Keyword Relation Analysis Using Concept Graph Toward Automatic Categorization of Online Novels, Proc. AIT2013, 2013.11.
14. CHENGJIU YIN, Han-Yu Sung, Gwo-Jen Hwang, Sachio Hirokawa, Hui-Chun Chu, Brendan Flanagan, Yoshiyuki Tabata, Learning by Searching: A Learning Environment that Provides Searching and Analysis Facilities for Supporting Trend Analysis Activities, Journal of Educational Technology & Society, 2013.11.
15. Brendan Flanagan, Takahiko Suzuki, Jun Zeng, CHENGJIU YIN, Toshihiko Sakai, Kiyota Hashimoto, Sachio Hirokawa, Peer Knowledge Assisted Search Using Community Search Logs, International Journal of Ditigal Information and Wireless Communications(IJDIWC) , 3, 2, 2013.11.
16. Kazumasa Goda, Sachio Hirokawa, Tsunenori Mine, Automated Evaluation of Student Comments on Their Learning Behavior, Proc. ICWL2013, 2013.10.
17. Kazumasa Goda, Sachio Hirokawa, Tsunenori Mine, Correlation of Grade Prediction Performance and Validity of Self-Evaluation Comments, Prof. ACM SIGITE2013, 2013.10.
18. CHENGJIU YIN, Brendan Flanagan, Sachio Hirokawa, Yoshiyuki Tabata, Build A Search Engine To Support Doing Research Surveys On SNS, Proc. LTLE2013, 2013.09.
19. Tetsuya Nakatoh, Sachio Hirokawa, Evaluation of Tourism Resources Extraction based on Japanese Dependency Analysis, Proc. ESKM 2013, 2013.09.
20. Eisuke Ito, T. Urakawa, Brendan Flanagan, Sachio Hirokawa, Keywords Frequency Trend Analysis of Online Novels, Proc. ESKM 2013, 2013.09.
21. Tetsuya Nakatoh, Hirofumi Amano, Sachio Hirokawa, Prediction of Growth Rate of Operating Income using Securities Reports, Proc. ESKM 2013, 2013.09.
22. Jun Zeng, Brendan Flanagan, Qingyu Xiong, Junhao Wen, Sachio Hirokawa, Proposal of Seam Degree and Content Similarity for Web Page Segmentation, Proc. ESKM 2013, 2013.09.
23. Yasuhiro Yamada, Terutaka Tansho, Sachio Hirokawa, Proposal of a Matching System for Companies and Researchers Using Patents and Scientific Papers, Proc. ESKM 2013, 2013.09.
24. Brendan Flanagan, Yohei Inokuchi, CHENGJIU YIN, Sachio Hirokawa, Using Automatically Generated Mind Maps to Promote Initial Communication, Proc. AECT International Conference on the Frontier in e-Learning Research 201, 2013.08.
25. Makoto Okada, Sachio Hirokawa, Kiyota Hashimoto, A Investigation of Oppinions and Demands of New Farming Applicants of Japan Using Concept Graph in The Questionnaire Survey, Pcoc. IEIS2013, 2013.06.
26. Makoto Okada, Sachio Hirokawa, Kiyota Hashimoto, Analysis of Opinions from Questionnaire Surveys of Farming Candidates using Cross, Proc. KES-IIMS2013, 2013.06.
27. Xiao Lin, Eisuke Ito, Sachio Hirokawa, Chinese Tag analysis for foreign movie contents, Proc. of IEEE/ACIS ICIS2014, 2013.06.
28. Bren Flanagan, Chengjiu Yin, Takahiko Suzuki, Sachio Hirokawa, Intelligent Computer Classification of English Writing Errors, Proc. KES-IIMS2013, 2013.06.
29. CHENGJIU YIN, Sachio Hirokawa, Jane Yin-Kim Yau, Tetsuya Nakatoh, Kiyota Hashimoto, Yoshiyuki Tabata, Analyzing Research Trends with Cross Tabulation Search Engine, International Journal of Distance Education Technologies, 11, 1, 2013.01.
30. Jun Zeng, Toshihiko Sakai, Chengjiu Yin, Takahiko Suzuki, Sachio Hirokawa, Automatic Generation of Tourism Quiz using Blogs, the journal Artificial Life and Robotics, 17, 3, 2013.01.
31. Brendan Flanagan, Takahiko Suzuki, Jun Zeng, CHENGJIU YIN, Toshihiko Sakai, Kiyota Hashimoto, Sachio Hirokawa, Focused Search using Community Search Logs, Proc. ICDIPC2013, 2013.01.
32. Jun Zeng, Brendan Flanagan, Sachio Hirokawa, Layout-Tree-based Approach for Identifying Visually Similar Blocks in a Web Page, Proc. IWEA2013, 2013.01.
33. Brendan Flanagan, Takahiko Suzuki, Jun Zeng, CHENGJIU YIN, Toshihiko Sakai, Sachio Hirokawa, Kiyota Hashimoto, Peer Knowledge Assisted Search Using Community Search Logs, International Journal of Ditigal Information and Wireless Communications, 3, 2, 2013.01.
34. Kazunori Shimizu, Eisuke Ito, Sachio Hirokawa, Predicting Future Ranking of Online Novels based on Collective Intelligence, Proc. ICDIPC2013, 2013.01.
35. Sachio Hirokawa, Makoto Okada, Kiyota Hashimoto, Extraction of Hints and Advice from Hotel Reviews for Improving Small Hotel Management, Proc. CEC(IEEE 14th International Conference on Commerce and Enterprise Computing), 2012.12.
36. Toshihiko Sakai, Sachio Hirokawa, Feature Words that Classify Problem Sentence in Scientific Article, Proc. iiWAS2012, 2012.12.
37. Tetsuya Nakatoh, Sachio Hirokawa, Extraction of Tourist Behavior Contexts from Blog by Verbs and Their Objects, Proc. ESKM 2012, 2012.09.
38. Chengjiu Yin, Sachio Hirokawa, Brendan Flanagan, Takahiko Suzuki, Yoshiyuki Tabata, Mistake discovery and generation of exercises automaticity in contex, Proc. LTLE2012, 2012.09.
39. Eisuke Ito, Kazunori Shimizu, Sachio Hirokawa, Introducing faceted views in diversity of online novels, Proc. International Conference on Digital Information Management (ICDIM2012), 2012.08.
40. T. Sakai, M. Matsushita, B. Flanagan, J. Zeng, S. Hirokawa, Analysis of Influence of Investor Relation Documents to Stock Price, Proc. FSKD2012, 2012.05.
41. Toshihiko Sakai,Jun Zeng,Brendan Flanagan,Tetsuya Nakatoh,Sachio Hirokawa, Discriminant Words for Problems in Scientific Articles, Proceedings of International Symposium on Innovative E-Services and Information Systems (IEIS 2012), 2012.05.
42. J. Zeng,T. Sakai, B. Flanagan, S. Hirokawa, Extraction of Relevant Components Using Shallow Structure of HTML Documents, Proc. FSKD2012, 2012.05.
43. Sachio Hirokawa, Feature Extraction using Restricted Bootstrapping, Proceedings of International Symposium on Innovative E-Services and Information Systems (IEIS 2012), 2012.05.
44. Brendan Flanagan, Chengjiu Yin, Sachio Hirokawa, Han-Yu Sung and Gwo-Jen Hwang, Analysing Research Trends of Mobile Learning with the Milky Way, Proc. 7th International Conference on Wireless, Mobile and Ubiquitous Technology in Education (WMUTE2012), 249-253, 2012.03.
45. Tetsuya Nakatoh, Chengjiu Yin and Sachio Hirokawa, Characteristic Grammatical Context of Tourism Information, ICIC Express Letters, 6, 2, 563-568, 2012.03.
46. Jun Zeng, Sachio Hirokawa, Component Search Engine based on HTML Path and Word Weight, ICIC Express Letters, 6, 3, 753-758, 2012.03.
47. Jun Zeng, Toshihiko Sakai, Chengjiu Yin, Takahiko Suzuki, Sachio Hirokawa, Automatic Generation of Tourism Quiz using Blogs, 7th International Symposium on Artificial Life and Robotics(AROB2012), 97-100, 2012.01.
48. Xiaobin Wu, Zeng Jun, Chengjiu Yin, Sachio Hirokawa, Sharing Knowledge and Experience of Search with SNS, 7th International Symposium on Artificial Life and Robotics(AROB2012), 101-104, 2012.01.
49. Kiyota Hashimoto, Kazuhiro Takeuchi, Makoto Okada, Sachio Hirokawa, Visual chance discovery method of potential keys for innovations in tourism, 7th International Symposium on Artificial Life and Robotics(AROB2012), 89-92, 2012.01.
50. Chengjiu Yin, Yoshiyuki Tabata, Sachio Hirokawa, A Milky Way Research Trend system for Survey of Scientific Literature, Proc. ELSM 2011, First International Workshop on Enhancing Learning with Social Media, 2011.12.
51. Chengjiu YIN, Yoshiyuki TABATA, Kiyota HASHIMOTO, Tetsuya NAKATOH, Sachio HIROKAWA, A Support System for Research Trend Survey of Scientific Literature, Proc. ICCE2011, 116-118, 2011.12.
52. Sachio Hirokawa, Jun Zeng, Comparison of Tourism Data using Double Ranking, Proc. SSNE, International Workshop on Innovative Tourism Informatics, 67-72, 2011.12.
53. Tetsuya Nakatoh, Chengjiu Yin, Sachio Hirokawa, Extraction and Disambiguation of Name of Place from Tourism Blogs, Proc. SSNE, International Workshop on Innovative Tourism Informatics, 73-78, 2011.12.
54. C. Yin, Y.Tabata, X. Wu, T. Nakatoh, S. Hirokawa, Building a Search Engine for Scientific Projects Survey, Proc. of IEEE Internetional Conference on Cyber, Physical and Social Computing (CPSCom 2011) workshops on "Technology-Enhanced Social Learning", 558-563, 2011.10.
55. K. Baba, T. Tanaka, E. Ishita, M. Mori, E. Ito, S. Hirokawa, Evaluation of Link System between Repository and Researcher Database, Proc. ICADL 2011, LNCS 7008, 382--383, 2011.10.
56. Yoshiaki Okubo, Makoto Haraguchi, Sachio Hirokawa, Finding Top-N Chance Patterns with KeyGraph-Based Importance, Proc. KES2011, LNCS 6882, 457--468, 2011.09.
57. Sachio Hirokawa, Takahiro Baba, Tetsuya Nakatoh, Search and Analysis of Bankruptcy Cause by Classification Network, Proc. 1st International Conference on Model & Data Engineering MEDI2011, LNCS 6918, 327--331, 2011.09.
58. Chengjiu Yin, Tetsuya Nakatoh, Ito Eisuke, Sachio Hirokawa, Classification network of tourism information -- A smart phone-based
system for supporting "Petit Trips", Proc. iCAST2011, 171--174, 2011.08.
59. J. Zeng, S. Hirokawa, Component Search Engine using Tree-View Interface, Proc. iCAST2011, 327--331, 2011.08.
60. S. Hirokawa, C. Yin, K. Hashimoto, Multidisciplinary Multi-Faceted Search Engine of Literatures on Tourism, Proc. 2nd International Symposium on Applied Informatics (ISAI 2011), 2011.08.
61. S. Hirokawa, T. Baba, T. Nakatoh, Text Mining of Bankruptcy Information using Formal Concept Analysis, Proc. iCAST2011, 532--537, 2011.08.
62. T. Nakatoh, C. Yin, H. Matsuura, S. Hirokawa, Visualization of Tourism Information using WordNet, Proc. iCAST2011, 413--418, 2011.08.
63. Sachio Hirokawa, Chengjiu Yin, Tetsuya Nakatoh, Component-Based Search Engine for Blogs, Proc. FUZZ-IEEE, 2011.06.
64. Masao Mori, Toshie Tanaka, Sachio Hirokawa, A Progressive Data Warehouse of Institutional Research with Web API and Mashup Visualization, Proc. CSEDU (3rd International Conference on Computer Supported Education), 2011.05.
65. Kiyota Hashimoto, Kazuhiro Takeuchi, Chengjiu Yin, Sachio Hirokawa, Extraction of Subjective Context-Sensitive Evaluation of Japanese Onomatopoeic Expressions and its Applications, ICIC Express Letters , Vol.5, No.10, pp.3755-3760, 2011, 2011.05.
66. Sachio Hirokawa, Chengjiu Yin, Kiyota Hashimoto, Kazuhiro Takeuchi, Search and Analysis of Gourmet Blogs with a Particular Reference to Onomatopoeia, ICIC Express Letters , Vol.5, No.8(B), pp.2971-2978, 2011, 2011.05.
67. Yasuhiro Yamada, Sachio Hirokawa, Coloring for Pattern Detection, Proc. 3rd Mahasarakham International Workshop on AI, 27-36, 27-36, 2009.12.
68. Yurie Iino, Sachio Hirokawa, Time Series Analysis of R&D Team Using Patent Information, Proc. 13th International Conference KES 2009, Part II, Springer LNCS 5712, 464-471, 2009.09.
69. Yurie Iino, Sachio Hirokawa, Evaluation of Research and Development Team Sructure from Patent Documents, 7th International Conference on Patents and Innovation, CD-ROM, 2009.01.
70. Yurie Iino, Yasuhiro Yamada, Sachio Hirokawa, Structural Analysis of R\&D Division from Patent Documents, IEEE International Conference on e-Business and Engineering, 423-428, 2008.10.
71. Yoshihiro Shimoji, Sachi Hirokawa, Dynamic Thesaurus Construction from English-Japanese Dictionary
, Proc. International Workshop on Ontology Alignment and Visualization, 2008.03.
72. Takahiro Seki, Taiki Wada, Yasuhiro Yamada, Nozomi Ytow, Sachio Hirokawa, Multiple viewed search engine for an e-journal --- a case study on Zoological Science, Proc. The 12th International Conference on Human-Computer Interaction Part IV, LNCS 4553, pp.989-998, 2007, 2007.07.
73. T. Miyahara, Y. Suzuki, T. Shoudai, T. Uchida, S. Hirokawa, K. Takahashi, H. Ueda, Extraction of Tag Tree Patterns with Contractible Variables from Irregular Semistructured data, Proc. PAKDD, 2637, pp.430--436, 2003.04.
74. Structural Analysis of Web Graph.
Works, Software and Database
1. .