Research interests

Online community is an interesting and powerful platform for communication, content sharing, and collaboration. I'm interested in "How do we enhance activities on online community?" and "How should we construct platform for online community?" My approach is that "Relationship is an important!". So, almost of all my projects are related to networks, e.g., social networks, content networks, and knowledge networks.

Information Recommendation
Information Sharing
Social Network
Online Community
Semantic Web
Web Intelligence
Web Mining
Interaction Design

Massively Collaborative Creation

Fig. Citation network of Hatsune Miku movies on Nico Nico Douga.

The Web was created as a publishing platform, but it is increasingly becoming a two-way communication platform for people. Thanks to the ?exibility of the Web, communications of various types have emerged. As a platform for communications, the Web presents various advantages over older systems. For example, it eliminates the sense of distance because people at any place can mutually communicate. It supports massive interactive collaboration through large-scale BBS and social tagging, which is impossible in real-world communication channels. It also enables large-scale information sharing not only of texts but also of various multimedia contents such as videos. We designate activities of this type as massively collaborative creation by which a huge number of people mutually collaborate to create contents on the Web.

Massively collaborative creation on the Web has features that augment traditional collaborative creation; one is the style of participation. Vastly numerous people are involved. For that reason alone, they often do not know each other. Numerous evolved or inspired versions of a video can be created if a video explores a new idea or if it ”catches on”. Another difference is the digital reuse of contents. Some components of a work are reused in evolved or inspired versions. For example, an image or sound in a video can be reused in a new version of the video. Consequently, digital work can be developed among people via the Web.

Social media sites are expected to be interactive, but interactivity is not simple. We should take these points into account when designing new social media, particularly those that support creative activities. This project aims to understand such new networks and develop a system for massively collaborative creation.

"Social Networks of an Emergent Massively Collaborative Creation Community - Case Study of Hatune Miku Movie on Nico Nico Douga", SDoW2009 (2009) [SDoW2009]
"Network Analysis of Massively Collaborative Creation of Multimedia Contents - Case Study of Hatsune Miku videos on Nico Nico Douga -", uxTV2008 (2008) [ACM Portal]
"Automatic Citation Visualization for Collaborative Contents Creation and Sharing Platform", CSCW2008, (2008).
"Social Creativity Supported by Sensing of Re-Creation Processes", CCASNS08 (2008). [CCASNS08]

Social Knowledge Construction

Defining structure of knowledge for representing data semantics is usually a costly and time consuming task. Ontology is one of the powerful structures of knowledge but most of them are constructed by experts of ontology engineering. This project aims to construct knowledge with collective intelligence.

"Social Infobox: collaborative knowledge construction by social property tagging", CSCW2011 (2011) [ACM Portal]
"Ontology Extraction using Social Network", SWeCKa2007 (2007) [Paper]
"Experimental Results for a method to discover of human relationship based on WWW bookmarks", KES2001 (2001) [Paper]

Social Matching

Fig. Two types of Introduction.

This project aims to assistance of expanding social networks. We proposes a system to introduce users to others. Introduction is one of social matching methods based on social context. It requires consideration of social relationship among three persons: a person who wants to be introduced, a person who is a target of introduction, and an introducer. A social matching process does not simply mean that a person is to ?nd target persons but should include that she/he finds a way to introduce herself/himself to target persons. In this project, we discuss about introduction and propose an introduction system. Recently, social networking services (SNSs) have become popular. Social matching is effective way to enlarge social capital. Our working contributes knowledge to future research and systems.

"A study of an Introduction Assistance for Social Matching", journal of Japan Society for Fuzzy Theory and Intelligent Informatics (2008) [Paper] (in Japanese)
"Find better friends? - Re-configuration of personal networks by the neighborhood matchmaker method -", SWFAT (2003) [Paper]

media Exprimo Project (2007-2012)

It is an interdisciplinary research project that aims to help enrich and sustain citizen media expression. The name “media exprimo” will also represent the technology systems and cultural programs we intend to produce in the near future.

The overall objectives of media exprimo can be identified as follows:

Develop technology systems to serve as a platform for an “expression-interweaving” society and supply the necessary information design.
Develop cultural programs to support and sustain an “expression-interweaving” society and supply the necessary information design.
Design the forms and modes required for the functioning of an “expression-interweaving” society.

media exprimo Website

Event Space Information Support Project (2003-2007)

Fig. The concept of our system called Polyphonet Conferece.

This is a research project to activate community by supporting real-world-based interaction using Ubiquitous and Web Intelligence. We have targeted on event space such as expos or conventions because such space contain rich contents and many attendees. It is a good trial space for new technologies.

Demo movie of Polyphonet Conference

"POLYPHONET: An Advanced Social Network Extraction System", Journal of Web Semantics, (2007) [ymatuco.com]
"Community Focused Social Network Extraction", ASWC2006 (2006) [Paper]
"Doing Community with IC Cards: Co-construction of Meaning and Use with Interactive Information Kiosks", Ubicomp2006 (2006) [Paper]
"Spinning Multiple Social Network for Semantic Web", AAAI-06 (2006) [ymatuco.com]
"Scheduling Support System for Academic Conferences Based on Interpersonal Networks", HyperText 2004 (2004). [Paper]

Publications

Journal Publications

Yutaka Matsuo, Junichiro Mori, Masahiro Hamasaki, Keisuke Ishida, Takuichi Nishimura, Hideaki Takeda, Koiti Hasida, and Mitsuru Ishizuka: POLYPHONET: An Advanced Social Network Extraction System, Journal of Web Semantics, Vol. 5, No. 4, 2007.

Conference Publication

Tom Hope, Yoshiyuki Nakamura, Toru Takahashi, Atsushi Nobayashi, Shota Fukuoka, Masahiro Hamasaki, Takuichi Nishimura: "Familial Collaborations in a Museum", Proceedings of the 27th international conference on Human factors in computing systems (CHI2009), pp. 1963-1972, 2009 [ACM]
Toshihiro Kamishima, Masahiro Hamasaki, Syotaro Akaho: "TrBagg: A Simple Transfer Learning Method and Its Application to Personalization in Collaborative Tagging", Proceedings of the International Conference on Data Mining, pp.219-228, 2009. [kamishima.net]

Masahiro Hamasaki, Hideaki Takeda, Takuichi Nishimura: "Network Analysis of Massively Collaborative Creation of Multimedia Contents - Case Study of Hatsune Miku videos on Nico Nico Douga -", in First International Conference on Designing Interactive User Experiences for TV and Video (uxTV2008), pp. 165-168, 2008. [ACM Portal]
Toshihiro Kamishima, Masahiro Hamasaki, Syotaro Akaho: "Personalized Tag Predition Boosted by BaggTaming: A Case Study of the Hatena Bookmark", The Third International Workshop on Data-Mining and Statistical Science (DMSS2008), 2008.
Koichiro Eto and Masahiro Hamasaki and Kuniaki Watanabe and Yoshinori Kawasaki and Takuichi Nishimura: "Modulobe: A Creation and Sharing Platform for Articulated Models with Complex Motion", International Conference on Advances in Computer Entertainment Technology (ACE2008), pp. 305-308, 2008. [ACM Portal]

Yutaka Matsuo, Junichiro Mori, Masahiro Hamasaki, Keisuke Ishida, Takuichi Nishimura, Hideaki Takeda, Koiti Hashida, and Mitsuru Ishizuka: "POLYPHONET: An Advanced Social Network Extraction System from the Web", Proc. of the 15th World Wide Web Conference (WWW2006)，2006
Takuichi Nishimura, Yutaka Matsuo, Masahiro Hamasaki, Noriyuki Fujimura, Keisuke Ishida, Tom Hope, Yoshiyuki Nakamura, Satoshi Fujiyoshi, Kazuya Sakamoto, Toru Takahashi, and Hideaki Takeda: "A Method of Social Network Extraction via Internet and Networked Sensing", Proc. of the 3rd International Conference on Networked Sensing Systems (INSS2006), 2006
Yutaka Matsuo, Masahiro Hamasaki, Hideaki Takeda, Junichiro Mori, Bollegara Danushka, Hiroyuki Nakamura, Takuichi Nishimura, Koiti Hasida, and Mitsuru Ishizuka: "Spinning Multiple Social Network for Semantic Web", Proc. of the Twenty-First National Conference on Artificial Intelligence (AAAI-06), 2006
Tom Hope, Masahiro Hamasaki, Fujimura Noriyuki, and Takuichi Nishimura: "Doing Community with IC Cards: Co-construction of Meaning and Use with Interactive Information Kiosks", Proc. of the Eighth International Conference on Ubiquitous Computing (Ubicomp2006)，2006
Masahiro Hamasaki，Yutaka Matsuo，Keisuke Ishida，Yoshiyuki Nakamura，Takuichi Nishimura，Hideaki Takeda: "Community Focused Social Network Extraction", Proceedings of 1st Asian Semantic Web Conference (ASWC2006)，2006 [Paper]

Ryutaro Ishise，Masahiro Hamasaki，Hideaki Takeda: "Discovering relationships among catalogs", Proc. of the 7th International Conference on Discovery Science}, Vol. 3245 of LNAI, pp. 371-379，Springer，2004
R. Ichise, M. Hamasaki and H. Takeda: A Multi-strategy Approach for Catalog Integration, in PRICAI 2004: Trends in Artificial Intelligence: 8th Pacific Rim International Conference on Artificial Intelligence, Vol. 3157 of Lecture Notes in Computer Science, pp. 944?945, Springer-Verlag (2004).
R. Ichise, M. Hamasaki and H. Takeda: A Hybrid Algorithm for Alignment of Concept Hierarchies, in Engineering Knowledge in the Age of the Semantic Web: 14th International Conference, EKAW 2004, Vol. 3257 of Lecture Notes in Computer Science, pp. 474?476, Springer-Verlag (2004).
R. Ichise, M. Hamasaki and H. Takeda: Discovering Relationships Among Catalogs, in E. Suzuki and S. Arikawa eds., Discovery Science: 7th International Conference, DS 2004, Padova, Italy, October 2-5, 2004., Lecture Notes for Computer Science (LNCS) 3245, pp. 371?379, Springer-Verlag (2004).
I. Ohmukai, H. Takeda, M. Hamasaki, K. Numa and S. Adachi: Metadata-Driven Personal Knowledge Publishing, in S. A. McIlraith, D. Plexousakis and F. van Harmelen eds., The Semantic Web - ISWC 2004: Third International Semantic Web Conference, Hiroshima, Japan, November 7-11, 2004., Vol. 3298 of Lecture Notes in Computer Science (LNCS), pp. 591?604 (2004).

Masahiro HAMASAKI, Hideaki TAKEDA: "Neighborhood Matchmaker Method: A Decentralized Optimization Algorithm for Personal Human Network", Seventh International Conference on Knowledge-Based Intelligent Information Engineering Systems & Allied Thchnologies (KES-2003), 2003 [Paper]
Masahiro HAMASAKI, Hideaki TAKEDA: "Proposal of Decentralized Information Sharing System using Local Matchmaking", 2003 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (PACRIM'03), 2003

Masahiro HAMASAKI, Hideaki TAKEDA: "Experimental Results for a method to discover of human relationship based on WWW bookmarks", Fifth International Conference on Knowledge-Based Intelligent Information Engineering Systems & Allied Thchnologies (KES-2001), pp. 1291--1295, 2001 [Paper]

Tomoyuki Hiroyasu，Mitsunori Miki，Masahiro Hamasaki，Yusuke Tanimura: "A New Model of Distributed Genetic Algorithm for Cluster Systems: Dual Individual DGA", CC-TEA'2000 Organized At 2000 International Conference on Parallel and Distributed, Processing Techniques and Applications，2000.6
Tomoyuki Hiroyasu，Mitsunori Miki，Masahiro Hamasaki，Yusuke Tanimura: "A New Model of Distributed Genetic Algorithm for Cluster Systems: Dual Individual DGA"，The third International Symposium on High Performance Computing，2000.10
Tomoyuki HIROYASU, Mitsunori MIKI, Masahiro HAMASAKI and Yusuke TANIMURA : "A New Model of Parallel Distributed Genetic Algorithms for Cluster Systems: Dual Individual DGAs", High Performance Computing, Lecture Notes in Computer Sicence 1940, (2000), pp.374-383
Tomoyuki HIROYASU, Mitsunori MIKI, Masahiro HAMASAKI and Yusuke TANIMURA: "A New Model of Distributed Genetic Algorithm for Cluster Systems: Dual Individual DGA", Proceedings of the International Conference on Parallel and Distributed Processing Techiniques and Applications, Volume 1, (2000) , pp.477-483

Poster/Workshop Publication

Masahiro Hamasaki and Mataka Goto and Hideaki Takeda: "Social Infobox: collaborative knowledge construction by social property tagging", in Poster, the ACM 2011 Conference on Computer Supported Cooperative Work (CSCW2011), 2011. [ACM Portal]
Masahiro Hamasaki, Hideaki Takeda: "Social Networks of an Emergent Massively Collaborative Creation Community - Case Study of Hatune Miku Movie on Nico Nico Douga", Proceedings of 2nd workshop on Social Data on the Web (SDoW2009), 2009 [SDoW2009]
Masahiro Hamasaki, Hideaki Takeda, Tom Hope, Takuichi Nishimura: "Network Analysis of an Emergent Massively Collaborative Creation Community: How Can People Create Videos Collaboratively without Collaboration?", in Poster, Proceedings of 1st Asian Semantic Web Conference (ICWSM2009), poster, 2009 [Paper]
Masahiro Hamasaki and Koichiro Eto and Kuniaki Watanabe and Sri Kurniawan and Takuichi Nishimura: "Automatic Citation Visualization for Collaborative Contents Creation and Sharing Platform", in Poster, the ACM 2008 Conference on Computer Supported Cooperative Work (CSCW2008), 2008.
Masahiro Hamasaki, Masahiro Hamasaki, Koichiro Eto, Kuniaki Watanabe, Yoshinori Kawasaki, Yutaka Matsuo, and Takuichi Nishimura: "Social Creativity Supported by Sensing of Re-Creation Processes", The First International Workshop on Content Creation Activity Support by Networked Sensing (CCASNS08), (2008). [CCASNS08]
Masahiro Hamasaki, Yutaka Matsuo, Takuichi Nishimura and Hideaki Takeda: "Ontology Extraction using Social Network", International Workshop on Semantic Web for Collaborative Knowledge Acquisition (SWeCKa 2007) (2007). [Paper]
Masahiro Hamasaki, Yutaka Matsuo, Keisuke Ishida, Yoshiyuki Nakamura, Takuichi Nishimura, "An integrated method for social network extraction", in Poster, 15th International World Wide Web Conference (WWW2006) (2006). [WWW2006]
M. Hamasaki, H. Takeda, I. Ohmukai and R. Ichise: "Scheduling Support System for Academic Conferences Based on Interpersonal Networks" in Poster, HyperText 2004 (2004). [Paper]
Y. Matsuo, M. Hamasaki, J. Mori, H. Takeda and K. Hasida: Ontological Consideration on Human Relationsihp Vobabulary for FOAF, in Workshop notes of 1st Workshop on Friend of a Friend, Social Networking and Semantic Web, Galway (2004).
K. Numa, I. Ohmukai, M. Hamasaki and H. Takeda: Egocentric Search based on RSS, in Poster Proceedings of Third International Semantic Web Conference (ISWC2004) (2004).
Masahiro HAMASAKI, Hideaki TAKEDA: "Find better friends? - Re-configuration of personal networks by the neighborhood matchmaker method -", International Workshop on Semantic Web Foundations and Application Technologies (SWFAT). [Paper]

In Book

Masahiro Hamasaki, Kouchiro Eto, Sri Kurniawan, Tom Hope, Hideaki Takeda, and Takuichi Nishimura: "Social Computing and Virtual Communities", Chapter 7: Online Content sharing, Panayiotis Zaphiris and Chee Siang Ang (Eds.), Chapman and Hall/CRC (2010).
Masahiro Hamasaki, Hideaki Takeda, Ikki Ohmukai and Ryutaro Ichise: Application and Analysis of Interpersonal Networks for a Community System, in New Frontiers in Artificial Intelligence: Joint Proceeding of the 17th and 18th Annual Conferences of the Japanese Society for Artificial Intelligence, Lecture Notes for Computer Science, Springer (2007). [Paper]