Updated on 2024/02/15

写真a

 
KOHANA Masaki
 
Organization
Faculty of Global Informatics Associate Professor
Other responsible organization
Global Informatics Course of Graduate School of Global Informatics, Master's Program
Contact information
The inquiry by e-mail is 《here
External link

Degree

  • 博士(理工学) ( 成蹊大学 )

  • 修士(工学) ( 成蹊大学 )

Education

  • 2013.3
     

    Seikei University   doctor course   completed

  • 2010.3
     

    Seikei University   master course   completed

  • 2008.3
     

    Seikei University   graduated

Research History

  • 2019.4 -  

    中央大学国際情報学部准教授

  • 2017.2 - 2019.3

    茨城大学 工学部 工学基礎領域 助教

  • 2013.4 - 2017.1

    成蹊大学 理工学部 情報科学科 助教

  • 2012.4 - 2013.3

    成蹊大学 理工学部 情報科学科 非常勤実験嘱託

Professional Memberships

  • IEEE Computer Society

  • ACM

  • 電子情報通信学会

  • 情報処理学会

Research Interests

  • Text Mining

  • Web Mining

  • Web System

  • Distributed and Parallel System

Research Areas

  • Informatics / Software  / Software

  • Informatics / Web informatics and service informatics  / "Web informatics, Service informatics"

  • Informatics / Computer system  / Computer system

Papers

  • A Preliminary Study of a Hybrid Data-Sharing Network for Web-Based Virtual Worlds Reviewed

    Masaki Kohana, Shusuke Okamoto

    Lecture Notes on Data Engineering and Communications Technologies book series (LNDECT,volume 183)   474 - 482   2023.8

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)  

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  • A graphical front-end interface for React.js considering state-transition diagrams Reviewed

    Shotaro Naiki, Masaki Kohana, Michitoshi Niibori, Shusuke Okamoto, Yasuhiro Ohtaki, Masaru Kamada

    International Journal of Grid and Utility Computing   13 ( 5 )   482 - 494   2022.9

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Inderscience  

    DOI: 10.1504/IJGUC.2022.10051206

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  • Implementation of Interactive Tutorial for IslayTab by Restricting and Highlighting the DOM Node to Tap.

    Riku Takano, Michitoshi Niibori, Yudai Okui, Masaki Kohana, Shusuke Okamoto, Masaru Kamada

    NBiS   457 - 463   2022

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    Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1007/978-3-031-14314-4_48

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    Other Link: https://dblp.uni-trier.de/db/conf/nbis/nbis2022.html#TakanoNOKOK22

  • A WebRTC Signaling Method Among Web Browsers on a Web-Based Virtual World.

    Masaki Kohana

    3PGCIC   164 - 171   2022

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    Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1007/978-3-031-19945-5_16

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    Other Link: https://dblp.uni-trier.de/db/conf/3pgcic/3pgcic2022.html#Kohana22

  • A Investigation of Suitable Data Transfer Range for Web-Based Virtual World Applications Reviewed

    Masaki Kohana, Shinji Sakamoto, Shusuke Okamoto

    The 16th International Conference on P2P, Parallel, Grid, Cloud and Internet Computing (3PGCIC-2021)   165 - 174   2021.10

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:Springer  

    DOI: 10.1007/978-3-030-89899-1_17

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    Other Link: https://dblp.uni-trier.de/db/conf/3pgcic/3pgcic2021.html#KohanaSO21

  • A Dynamic and Distributed Simulation Method for Web-Based Games Reviewed

    R. Fukutani, S. Okamoto, S. Sakamoto, M. Kohana

    Advances in Networked-Based Information Systems. NBiS 2021. Lecture Notes in Networks and Systems   313   391 - 400   2021.9

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    DOI: 10.1007/978-3-030-84913-9_40

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    Other Link: https://dblp.uni-trier.de/db/conf/nbis/nbis2021.html#FukutaniOSK21

  • A SPA of Online Lecture Contents with Voice Reviewed

    Masaki Kohana, Shusuke Okamoto, Masaru Kamada

    Advances in Networked-Based Information Systems. NBiS 2021. Lecture Notes in Networks and Systems   313   384 - 390   2021.9

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  • Recovering Lost Connection for Web Browser Network Reviewed

    Masaki Kohana, Shinji Sakamoto, Shusuke Okamoto

    The 9th International Workshop on Web Services and Social Media (WSSM-2020), in conjunction with the 23th International Conference on Network-Based Information Systems (NBiS-2020)   567 - 575   2020.9

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:Springer  

    DOI: 10.1007/978-3-030-57811-4_57

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    Other Link: https://dblp.uni-trier.de/db/conf/nbis/nbis2020.html#KohanaSO20

  • An Environment for Computer Programming Class Under COVID-19 Situation Reviewed

    Shusuke Okamoto, Shinji Sakamoto, Masaki Kohana

    The 9th International Workshop on Web Services and Social Media (WSSM-2020), in conjunction with the 23th International Conference on Network-Based Information Systems (NBiS-2020)   600 - 608   2020.9

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    DOI: 10.1007/978-3-030-57811-4_61

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    Other Link: https://dblp.uni-trier.de/db/conf/nbis/nbis2020.html#OkamotoSK20

  • Card Price Prediction of Trading Cards Using Machine Learning Methods Reviewed

    Hiroki Sakaji, Akio Kobayashi, Masaki Kohana, Yasunao Takano, Kiyoshi Izumi

    The 8th International Workshop on Web Services and Social Media (WSSM-2019), in conjunction with the 22th International Conference on Network-Based Information Systems, (NBiS-2019)   705 - 714   2019.9

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    Language:English   Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1007/978-3-030-29029-0_70

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    Other Link: https://dblp.uni-trier.de/db/conf/nbis/nbis2019.html#SakajiKKTI19

  • Web Service for Searching Halal Compliant Restaurants Reviewed

    IMAMA, Masaki Kohana, Masaru Kamada

    The 8th International Workshop on Web Services and Social Media (WSSM-2019), in conjunction with the 22th International Conference on Network-Based Information Systems, (NBiS-2019)   683 - 691   2019.9

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  • A Smart Lock Control System with Home Situation Reviewed

    Katsumi Ohkura, Masaki Kohana

    The 8th International Workshop on Web Services and Social Media (WSSM-2019), in conjunction with the 22th International Conference on Network-Based Information Systems, (NBiS-2019)   700 - 704   2019.9

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  • Implementation of Interactive Tutorial for IslayPub by Hooking User Events Reviewed

    Daisuke Tanaka, Masaki Kohana, Michitoshi Niibori, Yasuhiro Ohtaki, Shusuke Okamoto, Masaru Kamada

    The 8th International Workshop on Web Services and Social Media (WSSM-2019), in conjunction with the 22th International Conference on Network-Based Information Systems, (NBiS-2019)   692 - 699   2019.9

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  • A Real-Time Programming Battle Web Application by Using WebRTC Reviewed

    Ryoya Fukutani, Shusuke Okamoto, Shinji Sakamoto, Masaki Kohana

    The 8th International Workshop on Web Services and Social Media (WSSM-2019), in conjunction with the 22th International Conference on Network-Based Information Systems, (NBiS-2019)   731 - 737   2019.9

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    DOI: 10.1007/978-3-030-29029-0_73

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    Other Link: https://dblp.uni-trier.de/db/conf/nbis/nbis2019.html#FukutaniOSK19

  • 情報系学部におけるBYOD利用の試み Reviewed

    飯尾淳, 岡嶋裕史, 尾登啓一, 角田篤泰, 小花聖輝, 原田一義, 松崎和賢, 吉田雅裕

    公益社団法人私立大学情報教育協会 2019年度ICT利用による教育改善研究発表会   121 - 124   2019.7

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  • File Assignment Control for a Web System of Contents Categorization Reviewed

    Masaki Kohana, Hiroki Sakaji, Akio Kobayashi, Shusuke Okamoto

    Transaction on Computational Collective Intelligence   33   89 - 102   2019.6

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  • Enriching Folksonomy for Online Videos Reviewed

    Hiroki Sakaji, Masaki Kohana, Akio Kobayashi, Hiroyuki Sakai

    International Journal of Grid and Utility Computing   10 ( 3 )   258 - 264   2019.5

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  • A Web Platform for Oral Exam of Programming Class Reviewed

    Masaki Kohana, Shusuke Okamoto

    International Journal of Grid and Utility Computing   10 ( 3 )   265 - 271   2019.5

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  • Improving Document Similarity Calculation Using Cosine-Similarity Graphs Reviewed

    Yasunao Takano, Yusuke Iijima, Kou Kobayashi, Hiroshi Sakuta, Hiroki Sakaji, Masaki Kohana, Akio Kobayashi

    The 33rd International Conference on Advanced Information Networking and Applications (AINA-2020)   512 - 522   2019.3

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  • Estimation of Tags Using Various Data for Online Videos Reviewed

    Hiroki Sakaji, Akio Kobayashi, Masaki Kohana, Yasunao Takano, Kiyoshi Izumi

    The 33rd International Conference on Advanced Information Networking and Applications (AINA-2019)   301 - 312   2019.3

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    DOI: 10.1007/978-3-030-15032-7_26

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    Other Link: https://dblp.uni-trier.de/db/conf/aina/aina2019.html#SakajiKKTI19

  • Web Browser Network Based on a BA Model for a Web-Based Virtual World. Reviewed

    Masaki Kohana, Shinji Sakamoto, Shusuke Okamoto

    Future Internet   11 ( 7 )   147 - 147   2019

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:MDPI  

    DOI: 10.3390/fi11070147

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  • A Location-Based Web Browser Network for Virtual Worlds Reviewed

    Masaki Kohana, Shusuke Okamoto

    The 7th International Workshop on Web Services and Social Media (WSSM-2018), in conjunction with the 21th International Conference on Network-Based Information   929 - 936   2018.8

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  • A Graphical Front-End Interface for React.js Reviewed

    Shotaro Naiki, Masaki Kohana, Shusuke Okamoto, Masaru Kamada

    The 7th International Workshop on Web Services and Social Media (WSSM-2018), in conjunction with the 22th International Conference on Network-Based Information   887 - 896   2018.8

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  • A Parallel Calculation Method on Web Browser for Contents Categorization Reviewed

    Masaki Kohana, Hiroki Sakaji, Akio Kobayashi, Shusuke Okamoto

    The 32th International Conference on Advanced Information Networking and Applications Workshop (WAINA-2018)   40 - 44   2018.5

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  • A Data Sharing Method Using WebRTC for Web-Based Virtual World Reviewed

    Masaki Kohana, Shusuke Okamoto

    The 6th International Conference on Emerging Internet, Data & Web Technologies (EIDWT-2018)   880 - 888   2018.3

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  • Running a MPI Program on Web Browsers Reviewed

    Shusuke Okamoto, Masaki Kohana

    2017 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (PACRIM’17)   2017.8

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  • A Method for Extracting Correct Links from Automatic Created Links on Folksonomy Reviewed

    Akio Kobayashi, Hiroki Sakaji, Masaki Kohana

    The 6th International Workshop on Web Services and Social Media (WSSM-2017), in conjunction with the 20th International Conference on Network-Based Information Systems (NBiS-2018)   1144 - 1150   2017.8

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  • A Topic Trend on P2P Based Social Media Reviewed

    Masaki Kohana, Hiroki Sakaji, Akio Kobayashi, Shusuke Okamoto

    The 6th International Workshop on Web Services and Social Media (WSSM-2017), in conjunction with the 20th International Conference on Network-Based Information Systems (NBiS-2017)   1136 - 1143   2017.8

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  • モノのインターネットのためのアプリケーションフレームワーク

    乾高大, 小花聖輝, 岡本秀輔, 鎌田賢

    電子情報通信学会2種研究会サイバーワールド(CW)第35回研究会   19 - 24   2017.3

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  • IoT Technologies: State of the Art and a Software Development Framework Reviewed

    Takahiro Inui, Masaki Kohana, Shusuke Okamoto, Masaru Kamada

    Smart Sensors Networks: Communication Technologies and Intelligent Applications   3 - 18   2017.1

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    Language:English   Publishing type:Part of collection (book)   Publisher:Elsevier Inc.  

    The Internet of Things is a new structure of internetworking, on which things in our daily life are connected to the Internet to collect and exchange data. This chapter introduces the current status of the Internet of Things that includes some examples of applications, standardization trends, and basic technologies. Some security risks are discussed. The chapter also proposes a software framework for development of the Internet of Things, and discusses the importance of timer accuracy under periodic processing.

    DOI: 10.1016/B978-0-12-809859-2.00002-4

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  • A Distributed Calculation Scheme for Contents Categorization Reviewed

    Masaki Kohana, Hiroki Sakaji, Akio Kobayashi, Shusuke Okamoto

    2017 IEEE 31ST INTERNATIONAL CONFERENCE ON ADVANCED INFORMATION NETWORKING AND APPLICATIONS (AINA)   614 - 620   2017

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    This paper describes a distributed calculation scheme for scoring relationship among documents. This scheme categorizes documents by using an algorithm which calculates a score value for the relationship between a category and a word in a document. The longer calculation time becomes when increasing the number of documents. Therefore, our scheme uses multiple machines. A master node divides a document set into several subsets, and it distributes them to each calculation nodes. Using this distributed calculation makes the calculation time short, and also makes the memory usage low.

    DOI: 10.1109/AINA.2017.99

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  • IoT向けLinuxスケジューラの調査

    乾高大, 小花聖輝, 岡本秀輔

    電子情報通信学会2種研究会サイバーワールド(CW)第32回研究会   33 - 38   2016.3

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  • Access Control for a Confirming Attendance System Reviewed

    Masaki Kohana, Shusuke Okamoto

    International Journal of Space-Based and Situated Computing   6 ( 2 )   121 - 128   2016

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  • A C plus plus Header Library for Web Applications Reviewed

    Shusuke Okamoto, Masaki Kohana

    PROCEEDINGS OF 2016 19TH INTERNATIONAL CONFERENCE ON NETWORK-BASED INFORMATION SYSTEMS (NBIS)   541 - 545   2016

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    This paper describes a C++ library to build web applications. The idea is borrowed from Node.js and Express. js which are a rapid web development framework for JavaScript. Our library consists of a few header files so that it can be available by including them into a source code. The API uses some C++ 14 features, especially 'auto' type, and the program which uses this library becomes concise and clear. In this paper, the design policy, several sample programs and its implementation are presented.

    DOI: 10.1109/NBiS.2016.41

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  • A Reservation System for Oral Exam of Programming Class Reviewed

    Masaki Kohana, Shusuke Okamoto

    PROCEEDINGS OF 2016 19TH INTERNATIONAL CONFERENCE ON NETWORK-BASED INFORMATION SYSTEMS (NBIS)   516 - 519   2016

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    In an university, students take an oral exam to check the understanding level. Especially, in a programming class, a student writes a program source code to solve a practice. Then, the student takes an oral exam. To support the ordering of the oral exam and the checking source code, this paper proposes a reservation system for oral exam. A student uploads source code files to the system. Then, the student is registered to a queue of the oral exam. The student can check the own turn because the own student ID is highlighted. A teacher checks the source code files and asks some questions to the student. Finally, the teacher grades the student and registers the grade to the system.

    DOI: 10.1109/NBiS.2016.43

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  • A Location-Based Attendance Confirming System Reviewed

    Masaki Kohana, Shusuke Okamoto

    IEEE 30TH INTERNATIONAL CONFERENCE ON ADVANCED INFORMATION NETWORKING AND APPLICATIONS IEEE AINA 2016   816 - 820   2016

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    In this paper, we propose a location registration scheme using location-based Social Networking Services. Our system provides schedules of a teacher on a Web page. The schedule includes the classes, the meetings, and the official trips. However, the teacher might not have any time to register schedules or forget to register the schedule. Therefore, we need a scheme to register the schedule easily. One of approaches is the location registration. If a student knows a location of the teacher, the student knows whether the teacher is in the room or not. Our system register the location information by collaborating with location-based SNSs.

    DOI: 10.1109/AINA.2016.119

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  • Food Truck Scheduling Model Reviewed

    Hironori Harada, Masaki Kohana, Shusuke Okamoto

    International Journal of Space-Based and Situated Computing   6 ( 2 )   113 - 120   2016

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  • Estimation of Tags via Comments on Nico Nico Douga Reviewed

    Hiroki Sakaji, Masaki Kohana, Akio Kobayashi, Hiroyuki Sakai

    PROCEEDINGS OF 2016 19TH INTERNATIONAL CONFERENCE ON NETWORK-BASED INFORMATION SYSTEMS (NBIS)   550 - 553   2016

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    In this paper, we propose a method that estimates new tags from user comments on videos on the Nico Nico Douga website. On Nico Nico Douga, users can post tags and comments on videos. However, users cannot post more than 12 tags on a video; therefore, there are some important tags that could be posted but are sometimes missed. We present a technique to acquire some of these missing tags by choosing new tags that score well in a scoring method developed by us.

    DOI: 10.1109/NBiS.2016.46

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  • Message from the WSSM 2015 workshop organizers Reviewed

    Shusuke Okamoto, Masaki Kohana

    Proceedings - 2015 18th International Conference on Network-Based Information Systems, NBiS 2015   1   2015.12

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:Institute of Electrical and Electronics Engineers Inc.  

    DOI: 10.1109/NBiS.2015.154

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  • モノのインターネットのためのアプリ開発手法

    乾高大, 小花聖輝, 岡本秀輔, 鎌田賢

    電子情報通信学会2種研究会サイバーワールド(CW)第30回研究会   15 - 18   2015.6

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  • ハンバーガー移動販売向けスケジューリングモデル

    原田浩成, 小花聖輝, 岡本秀輔

    電子情報通信学会2種研究会サイバーワールド(CW)第30回研究会   19 - 22   2015.6

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  • ARチェスアプリケーションの開発

    金内一樹, 小花聖輝, 岡本秀輔

    電子情報通信学会2種研究会サイバーワールド(CW)第29回研究会   21 - 24   2015.2

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  • ユーザ追尾を行うボール型ロボットの制御

    山口宏樹, 小花聖輝, 岡本秀輔

    電子情報通信学会2種研究会サイバーワールド(CW)第29回研究会   25 - 28   2015.2

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  • 東京ディズニーランドにおけるプラン作成支援システム

    藤原愛里, 小花聖輝, 岡本秀輔

    電子情報通信学会2種研究会サイバーワールド(CW)第29回研究会   17 - 20   2015.2

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  • A System for Confirming Attendance at Work Reviewed

    Masaki Kohana, Shusuke Okamoto

    PROCEEDINGS 2015 18TH INTERNATIONAL CONFERENCE ON NETWORK-BASED INFORMATION SYSTEMS (NBIS 2015)   714 - 717   2015

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    It is an important information that whether a person is in a room or not. In this paper, we propose a system for confirming attendance at work as a Web application. This system provides a information whether a presence is in a room or not. In addition, we can get a schedule of classes, meetings, official trips beforehand. This system also provides information about these schedules. However, it is insecure for us to open these information to the public. Therefore, our system limits a public range of the information. It changes the contents to provide according to the origin of access attempt.

    DOI: 10.1109/NBiS.2015.110

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  • A Server Selection Method for Web-based Multiserver Systems Reviewed

    Masaki Kohana, Shusuke Okamoto

    2015 IEEE 29th International Conference on Advanced Information Networking and Applications (IEEE AINA 2015)   112 - 117   2015

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    In our previous work, we proposed a dynamic data reallocation method for Web-based multiserver Multiplayer Online Role-Playing Game(MORPG) systems. This method handles the data allocation as a combinational optimization problem. It is solved by using a tabu search that is a well-known meta-heuristic algorithm. Our system has some Web servers and an additional computation server. The computation server solves algorithm and decides the data allocation. However, each load of server is not completely balanced. This means that some Web server might have free computing resources. We aim to use these resources effectively. Therefore, our system handles a Web server that has free resources as a computation server. In this paper, we propose a selection method of a computation server in the Web servers. The server loads might be predicted because the data allocation is decided according to the last server loads and the user requests. Therefore, our system predicts the load of each server and selects a Web server. This selected server acts the computation server and decides the data allocation for the next term. After that, the computation server predicts the server load and selects the next computation server. We evaluates the performance of our system by measuring the latency values for game users and the server loads.

    DOI: 10.1109/AINA.2015.174

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  • A Scheduling Model of a Lunch Car Reviewed

    Hironori Harada, Masaki Kohana, Shusuke Okamoto

    PROCEEDINGS 2015 18TH INTERNATIONAL CONFERENCE ON NETWORK-BASED INFORMATION SYSTEMS (NBIS 2015)   690 - 693   2015

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    This paper describes a scheduling model for a lunch car, which moves around city and gives service at some places. For this kind of services, there are several selections of places of selling, routing, and service time at a place. The optimal combination of those gives a good sales performance. The paper gives a background of this study, an example scheduling, a formulation of the problem, and a calculation of problem scale.

    DOI: 10.1109/NBiS.2015.104

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  • A Software Framework for Internet of Things Reviewed

    Takahiro Inui, Mashaki Kohana, Shusuke Okamoto, Masaru Kamada

    PROCEEDINGS 2015 18TH INTERNATIONAL CONFERENCE ON NETWORK-BASED INFORMATION SYSTEMS (NBIS 2015)   706 - 709   2015

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    This paper describes a software framework for building the Internet of Things widget with Raspberry Pi. This framework utilizes an interactive animation authoring tool called 'Islay,' which generates an interactive animation written in a programming language. A generated program for Raspberry Pi runs without any operating system. It is a bootable program, which uses hardware timer interrupt by itself. This paper gives an overview of the framework, some description of Raspberry Pi, and its mechanism of timer interrupt as well as a preliminary evaluation of a program using timer interrupt.

    DOI: 10.1109/NBiS.2015.108

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  • Sphero Control System using a Web Browser Reviewed

    Masaki Kohana, Shusuke Okamoto

    2014 17TH INTERNATIONAL CONFERENCE ON NETWORK-BASED INFORMATION SYSTEMS (NBIS 2014)   605 - 609   2014

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    This paper proposes a remote control system of Sphero using a web browser. Sphero is a robotics ball that is controlled by using a smartphone. A user can control Sphero using Android or iOS application. However, the user is supposed to be with the Sphero. We provides a remote control system as a web application. The user can control Sphero using a web browser. The Sphero connects to a smartphone and the smartphone connects to the web server. The smartphone is a relay station. The user sends operation commands to the web server using the web browser. The smartphone receives the commands from the web server and forwards it to the Sphero. The smartphone also sends camera images to the web server. The web browser receives the image from the web server and displays it. This means that the user can observe the state of the Sphero and control Sphero at a different place from a place that the Sphero exists. We confirm the behavior of our system and clarify some problems.

    DOI: 10.1109/NBiS.2014.63

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  • Optimal data allocation and fairness for online games Reviewed

    Masaki Kohana, Shusuke Okamoto, Atsuko Ikegami

    International Journal of Grid and Utility Computing   5 ( 3 )   183 - 189   2014

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    In our previous work, we proposed a load distribution technique and a dynamic data reallocation method for web-based Multiplayer Online Role-Playing Game (MORPG) systems. Our proposed approach reduced the average server latency for game players. However, latency values varied widely resulting in some game players gaining an advantage over others. In this paper, we deal with data allocation and consider latency fairness in the form of a combinational optimisation problem. We develop an optimisation model in which the objective function minimises the differences in latency values and we solve instances from this model using an exact algorithm. Our model improved latency fairness and more stable server loads than the previous data reallocation method. Furthermore, it provides more stable gameplay using ten web servers instead of five. Copyright © 2014 Inderscience Enterprises Ltd.

    DOI: 10.1504/IJGUC.2014.062925

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  • A Meta-Heuristic Approach for Dynamic Data Allocation on a Multiple Web Server System Reviewed

    Masaki Kohana, Shusuke Okamoto, Atsuko Ikegami

    IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS   E96D ( 12 )   2645 - 2653   2013.12

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    This paper describes a near-optimal allocation method for web-based multi-player online role-playing games (MORPGs), which must be able to cope with a large number of users and high frequency of user requests. Our previous work introduced a dynamic data reallocation method. It uses multiple web servers and divides the entire game world into small blocks. Each ownership of block is allocated to a web server. Additionally, the ownership is reallocated to the other web server according to the user's requests. Furthermore, this block allocation was formulated as a combinational optimization problem. And a simulation based experiment with an exact algorithm showed that our system could achieve 31% better than an ad-hoc approach. However, the exact algorithm takes too much time to solve a problem when the problem size is large. This paper proposes a meta-heuristic approach based on a tabu search to solve a problem quickly. A simulation result shows that our tabu search algorithm can generate solutions, whose average correctness is only 1% different from that of the exact algorithm. In addition, the average calculation time for 50 users on a system with five web servers is about 25.67 msec while the exact algorithm takes about 162 msec. An evaluation for a web-based MORPG system with our tabu search shows that it could achieve 420 users capacity while 320 for our previous system.

    DOI: 10.1587/transinf.E96.D.2645

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  • Document clustering based on web search hit counts Reviewed

    Masaya Kaneko, Shusuke Okamoto, Masaki Kohana, You Inayoshi

    International Journal of Business Intelligence and Data Mining   8 ( 1 )   61 - 73   2013

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    This paper describes a web mining method for clustering research documents automatically. Web hit counts of AND-search for two words are used to form a document feature vector. Target documents are clustered using the k-means clustering method twice, in which cosine similarity is used to calculate the distance measure. © 2013 Inderscience Enterprises Ltd.

    DOI: 10.1504/IJBIDM.2013.055787

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  • A parallelization of interactive animation software with web workers Reviewed

    Yuta Watanabe, Shusuke Okamoto, Masaki Kohana, Masaru Kamada, Tatsuhiro Yonekura

    Proceedings - 16th International Conference on Network-Based Information Systems, NBiS 2013   448 - 452   2013

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    Our interactive animation software is written in JavaScript, and is serial execution. However, it has a problem, which is related to drawing intervals. In case the software has to process a number of animation objects, it takes a long time. The longer drawing intervals are, the slower speed of animation playing is. So, we parallelize interactive animation software with Web Workers that is one part of HTML5. We partition drawing animation with some approaches, and parallelize their process. This time, we report the parallelization approach that takes into consideration the property of Web Workers and the interactive animation software. © 2013 IEEE.

    DOI: 10.1109/NBiS.2013.74

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  • Rapid authoring of web-based multiplayer online games Reviewed

    Shusuke Okamoto, Masaru Kamada, Masaki Kohana, Tatsuhiro Yonekura

    ACM International Conference Proceeding Series   639 - 643   2013

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    This paper describes a method for rapidly authoring multiplayer online games. The game author specifies state machines that define the behavior of game characters. The results are translated into a JavaScript code. The entire application is supported by Node.js at the server side and by modern Web browsers at the client side. Utilization of the WebSocket feature allows the communication between the Web browsers and the web server to be processed efficiently, and the player's interaction with the game interface is smooth. © 2013 ACM.

    DOI: 10.1145/2539150.2539227

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  • A clustering algorithm using twitter user biography Reviewed

    Masaki Kohana, Shusuke Okamoto, Masaya Kaneko

    Proceedings - 16th International Conference on Network-Based Information Systems, NBiS 2013   432 - 435   2013

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE Computer Society  

    Our previous work proposed a clustering algorithm to cluster research documents automatically. It used Web hit counts of AND-search on two words as a document vector. Target documents are clustered with a result of k-means clustering method, in which cosine similarity is used to calculate a distance. This paper uses this algorithm to cluster twitter users. However, the twitter users have different characteristics from the research documents. Therefore, we investigate problems of the using our algorithm for twitter users and propose some ideas to resolve it. © 2013 IEEE.

    DOI: 10.1109/NBiS.2013.70

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  • Optimal data allocation for keeping fairness of online game Reviewed

    Masaki Kohana, Shusuke Okamoto, Atsuko Ikegami

    Proceedings - 26th IEEE International Conference on Advanced Information Networking and Applications Workshops, WAINA 2012   1209 - 1214   2012

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    In our previous work, we proposed a load distri-bution technique and dynamic data reallocation method for web-based MORPG system. This approach could reduce the average server latency for game players. However, each latency widely varied, which leads unfair situation for game players. In this paper, we deal with data allocation with taking into account the fairness as a combinational optimization problem. We develop an optimization model whose objective function is to minimize the difference among latency value. We exactly solve this problem and compare the results with our previous data allocation method. © 2012 IEEE.

    DOI: 10.1109/WAINA.2012.190

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  • Document classification based on web search hit counts Reviewed

    Masaya Kaneko, Shusuke Okamoto, Masaki Kohana, You Inayoshi

    ACM International Conference Proceeding Series   223 - 228   2012

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    This paper describes a web mining method to classify research documents automatically. Web hit counts of AND-search on two words are used to form a document vector. Target documents are classified with a result of k-means clustering method, in which cosine similarity is used to calculate a distance. © 2012 ACM.

    DOI: 10.1145/2428736.2428772

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  • Dynamic Reallocation Rules on Multi-Server Web-Based MORPG System Reviewed

    Masaki Kohana, Shusuke Okamoto, Masaru Kamada, Tatsuhiro Yonekura

    International Journal of Grid and Utility Computing   3 ( 2/3 )   136 - 144   2012

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  • Load distribution by using Web Workers for a real-time web application Reviewed

    Shusuke Okamoto, Masaki Kohana

    International Journal of Web Information Systems   7 ( 4 )   381 - 395   2011

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    Purpose: The purpose of this paper is to propose a load distribution technique for a web server. It utilizes Web Workers, which is a new feature of Javascript. Design/methodology/approach: The authors have been implementing a web-based MORPG as an interactive, real-time web application
    previously, the web server alone was responsible for manipulating the behavior of all the game characters. As more users logged in, the workload on the server was increased. Hence, the authors have implemented a technique whereby the CPU load of the server is distributed among the clients. Findings: The authors found that some caching mechanism is useful for utilizing client-side calculation. The caching suppresses the increase of communication load. A performance evaluation reveals that the technique plays a role in decreasing the CGI latency of both low-end server and high-end server. The average latency is reduced to 59.5 percent of the original system. Originality/value: Web Workers allows scripts to be executed with keeping the page response on a web browser. It is intended to be used for raising user experience. This technique utilizes Web Workers for a web server to distribute the load to its clients. © Emerald Group Publishing Limited.

    DOI: 10.1108/17440081111187565

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  • Performance impact of virtualization on web-based MORPG system Reviewed

    Masaki Kohana, Shusuke Okamoto

    ACM International Conference Proceeding Series   333 - 336   2011

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    This paper describes a preliminary experiment and a discussion to introduce server consolidation to our web-based system. Unfortunately, naive virtualization of our system suffers from severe performance degradation. The experimental results obtained made clear the bottleneck of virtualized system. And a key to improve the performance is also presented. © 2011 ACM.

    DOI: 10.1145/2095536.2095596

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  • A twitter service for school event Reviewed

    Yosuke Jimbo, Masaki Kohana, Shusuke Okamoto

    Proceedings - 2011 2nd International Conference on Networking and Computing, ICNC 2011   266 - 270   2011

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    This paper describes a web system for supporting a school event using Twitter. This system collects messages related to a school event from Twitter and shows them in a various way. And it has a function for non-Twitter users to post a message with a specific tag to Twitter. Last year, we built a prototype system and provided it for our school festival. This paper shows the overview of our system, the experimental results and the discussion of result. Additionally, two new functions to increase the number of users and our future plans to evaluate our system are also presented. © 2011 IEEE.

    DOI: 10.1109/ICNC.2011.48

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  • Reallocation Criteria on Multi-Server Web-based MORPG System Reviewed

    Masaki Kohana, Shusuke Okamoto, Masaru Kamada, Tatsuhiro Yonekura

    25TH IEEE INTERNATIONAL CONFERENCE ON ADVANCED INFORMATION NETWORKING AND APPLICATIONS (AINA 2011)   564 - 570   2011

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    In recent times, the web-based applications has grown rapidly and there has been an explosive increase in the number of users. Hence, it is necessary to develop technique to deal with several users. In this study, we particularly focus on web-based multiplayer online role-playing games (MORPGs), which have a large number of users and deal with high frequency of user requests. In our previous work, we introduced a method to deal with a large number of users using multiple web servers and a dynamic data allocation method to deal with dynamic change in the user request. Using our method, we achieved a user capacity of 320 for the web-based MORPG system as opposed to 200 user capacity of the single server MORPG system. However, we found some cases in which our dynamic data allocation role was not effective. In this paper, we propose three rules for our dynamic data allocation method to address various situations. We evaluate these rules using four web servers and investigate their properties and effectiveness.

    DOI: 10.1109/AINA.2011.85

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  • Evaluation of a Dynamic Data Allocation Method for Web-Based Multi-Server MORPG System Reviewed

    Masaki Kohana, Shusuke Okamoto, Masaru Kamada, Tatsuhiro Yonekura

    IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS   E93D ( 12 )   3173 - 3180   2010.12

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    We have investigated the bottleneck in web based MORPG system and proposed a load distribution method using multiple web servers This technique uses a dynamic data allocation method called the moving home This paper describes the evaluation of our method using 4 8 16 web servers We evaluated it on both the single server system and multi server system And we confirm that the effect of the moving home through the comparison between the multi server system without the moving home and that with the moving home Our experimental result shows that the upper bound of the number of avatars in the eight server system with the moving home becomes 380 by contrast that in the single server system is 200

    DOI: 10.1587/transinf.E93.D.3173

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  • Load distribution by using web workers for a real-time web application Reviewed

    Shusuke Okamoto, Masaki Kohana

    iiWAS2010 - 12th International Conference on Information Integration and Web-Based Applications and Services   592 - 597   2010

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    In this paper, we describe a load distribution technique that employs web workers. We have been implementing a web-based MORPG as an interactive, real-time web application
    previously, the web server alone was responsible for manipulating the behavior of all the game characters. As more users logged in, the workload on the server was increased. Hence, we have implemented a technique whereby the CPU load of the server is distributed among the clients
    a performance evaluation reveals that our technique plays a role in decreasing the CGI latency of low-end servers and can decrease the CPU load of high-end servers when many users are logged in. Copyright 2010 ACM.

    DOI: 10.1145/1967486.1967577

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  • Dynamic data allocation scheme for multi-server Web-based MORPG system Reviewed

    Masaki Kohana, Shusuke Okamoto, Masaru Kamada, Tatsuhiro Yonekura

    24th IEEE International Conference on Advanced Information Networking and Applications Workshops, WAINA 2010   449 - 454   2010

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    Recently, due to the spread of broadband access to the Internet, the speeding up JavaScript on Web browsers and the development of communication technology such as Ajax, a variety of Web applications are provided. However, the access congestion to the Web server and the lower usability in case of higher frequent communication are major problems on the Web application. We have investigated the bottleneck in Web-based MORPG system and proposed the load-distribution technique using multiple Web servers[8]. This technique uses a dynamic allocation of the data, called the moving home. We proposed some rules for the moving home[9]. In this paper, we applied these rules to our MORPG system and evaluated them. © 2010 IEEE.

    DOI: 10.1109/WAINA.2010.70

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  • Improving bottleneck in Web-based MORPG Reviewed

    Masaki Kohana, Shusuke Okamoto, Masaru Kamada, Tatsuhiro Yonekura

    2009 IEEE PACIFIC RIM CONFERENCE ON COMMUNICATIONS, COMPUTERS AND SIGNAL PROCESSING, VOLS 1 AND 2   419 - 424   2009

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    The recent spread of broadband Internet access, speeding up of Java Script in Web browsers, and development of communications technology such as Ajax has led to the development of a variety of Web applications. The access congestion of Web servers and lower usability in the case of frequent requests are the major problems that affect the use of Web applications. In this study, we investigate the bottlenecks in single-server system. and propose a technique to improve the usability of Web-based MORPG servers.

    DOI: 10.1109/PACRIM.2009.5291335

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  • MORPGにおけるサーバ負荷分散手法の検討

    小花聖輝, 岡本秀輔, 鎌田賢, 米倉達広

    電子情報通信学会2種研究会 サイバーワールド(CW)第11回研究会   7 - 11   2008.12

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Books

  • Smart Sensors Networks

    Takahiro Inui, Masaki Kohana, Shusuke Okamoto, Masaru Kamada( Role: Joint authorChapter 1)

    Academic Press  2017.6  ( ISBN:9780128098592

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MISC

  • ニコニコ動画に投稿された動画の新しいタグの獲得

    坂地泰紀, 小花聖輝, 小林暁雄, 酒井浩之

    ファジィシステムシンポジウム講演論文集(CD-ROM)   32nd   ROMBUNNO.WD3‐3   2016

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    J-GLOBAL

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  • Web検索エンジンを用いた分類手法の評価

    金子雅哉, 岡本秀輔, 小花聖輝

    全国大会講演論文集   2013 ( 1 )   695 - 697   2013.3

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    Language:Japanese   Publisher:一般社団法人情報処理学会  

    近年、多くの文書をPDF ファイルとしてインターネット上から取得することが容易となった。そこで、本研究ではその膨大な量の文書ファイルを自動的に分類する、ドキュメント分類アルゴリズムを提案する。そのアルゴリズムは各文書から複数の単語を抽出し、単語間の類似度をweb 検索エンジンによるAND 検索のヒット数を基準にして計算する。そして、求めた各単語間の類似度をクラスタ分析手法の一つであるK-平均法に適用させることで、文書ファイルの分類を行う。本発表では提案したアルゴリズムの詳細と、その精度を評価するために行った実験とその結果について報告する。

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  • Proposition for Clustering based on Web Search Engine

    KANEKO Masaya, OKAMOTO Shusuke, KOHANA Masaki

    2013 ( 1 )   695 - 696   2013.3

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  • Evaluation for Online Game Data Reallocation based on Combinational Optimization Problem

    Masaki KOHANA, Shusuke OKAMOTO, Atsuko IKEGAMI

    2013 ( 1 )   63 - 64   2013.3

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  • Parallelization of Interactive Animation Software with Web Workers

    WATANABE Yuta, OKAMOTO Shusuke, KOHANA Masaki, KAMADA Masaru, YONEKURA Tatsuhiro

    2013 ( 1 )   141 - 142   2013.3

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  • B-030 A method for dynamic allocation of data on the multiple MORPG servers

    Kohana Masaki, Okamoto Shusuke, Kamada Masaru, Yonekura Tatsuhiro

    8 ( 1 )   423 - 424   2009.9

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Presentations

  • 様々なデータを用いた動画タグの予測

    坂地泰紀, 小林暁雄, 小花聖輝, 高野保直, 和泉潔

    人工知能と知識処理研究会 (AI)  2019 

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  • 動画サイトのコメントを用いたタグ推定に関する研究

    坂地泰紀, 小林暁雄, 小花聖輝

    IDRユーザフォーラム2017  2017.12 

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  • 移動販売スケジューリング・ウェブシステム

    原田浩成, 小花聖輝, 岡本秀輔

    電子情報通信学会2種研究会サイバーワールド(CW)第35回研究会  2017.3 

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  • モノのインターネットのためのアプリケーションフレームワーク

    乾高大, 小花聖輝, 岡本秀輔, 鎌田賢

    電子情報通信学会2種研究会サイバーワールド(CW)第35回研究会  2017.3 

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  • ニコニコ動画に投稿された動画の新しいタグの獲得

    坂地泰紀, 小花聖輝, 小林暁雄, 酒井浩之

    第32回ファジィシステムシンポジウム(FSS2016)  2016.8 

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  • IoT向けLinuxスケジューラの調査

    乾高大, 小花聖輝, 岡本秀輔

    電子情報通信学会2種研究会サイバーワールド(CW)第32回研究会  2016.3 

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  • ハンバーガー移動販売向けスケジューリングモデル

    原田浩成, 小花聖輝, 岡本秀輔

    電子情報通信学会2種研究会サイバーワールド(CW)第30回研究会  2015.6 

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  • モノのインターネットのためのアプリ開発手法

    乾高大, 小花聖輝, 岡本秀輔, 鎌田賢

    電子情報通信学会2種研究会サイバーワールド(CW)第30回研究会  2015.6 

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  • 東京ディズニーランドにおけるプラン作成支援システム

    藤原愛里, 小花聖輝, 岡本秀輔

    電子情報通信学会2種研究会サイバーワールド(CW)第29回研究会  2015.2 

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  • ARチェスアプリケーションの開発

    金内一樹, 小花聖輝, 岡本秀輔

    電子情報通信学会2種研究会サイバーワールド(CW)第29回研究会  2015.2 

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  • ユーザ追尾を行うボール型ロボットの制御

    山口宏樹, 小花聖輝, 岡本秀輔

    電子情報通信学会2種研究会サイバーワールド(CW)第29回研究会  2015.2 

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  • Web検索エンジンを用いた分類手法の提案

    金子雅哉, 岡本秀輔, 小花聖輝

    情報処理学会第75回全国大会  2013.3 

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  • Web Workersを使用した対話型アニメーションソフトウエアの並列化

    渡部裕太, 岡本秀輔, 小花聖輝, 鎌田賢, 米倉達広

    情報処理学会第75回全国大会  2013.3 

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  • 組合せ最適化問題に基づくオンラインゲームデータ再配置の評価

    小花聖輝, 岡本秀輔, 池上敦子

    情報処理学会第75回全国大会  2013.3 

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  • マルチサーバMORPGにおける動的な管理データ割当て手法

    小花聖輝, 岡本秀輔, 鎌田賢, 米倉達広

    FIT2009 第8回科学技術フォーラム  2009.9 

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  • MORPGにおけるサーバ負荷分散手法の検討

    小花聖輝, 岡本秀輔, 鎌田賢, 米倉達広

    電子情報通信学会2種研究会 サイバーワールド(CW)第11回研究会  2008.12 

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Awards

  • IDRユーザフォーラム2017 企業賞「Sansan株式会社」

    2017.12   IDRユーザフォーラム2017   動画サイトのコメントを用いたタグ推定に関する研究

    坂地泰紀, 小林暁雄, 小花聖輝

  • NBiS-2015 Workshop Best Paper Award

    2015.9   The 18th International Conference on Network-Based Information Systems (NBiS2015) Workshop  

    Masaki Kohana, Shusuke Okamoto

Allotted class

  • 2023   ICTケーススタディ(ネットワーク構築)   Department

  • 2023   OSとハードウェア   Department

  • 2023   コンピュータアーキテクチャ   Department

  • 2023   システム開発論   Department

  • 2023   プログラミング基礎   Department

  • 2023   卒業制作   Department

  • 2023   国際情報史   Department

  • 2023   国際情報演習Ⅰ   Department

  • 2023   国際情報演習Ⅱ   Department

  • 2023   国際情報演習Ⅲ   Department

  • 2023   国際情報演習Ⅳ   Department

  • 2023   国際情報演習Ⅴ   Department

  • 2023   基礎演習   Department

  • 2023   情報フルエンシー   Department

  • 2023   並列・分散システム特論   Graduate school

  • 2023   国際情報学実践研究(1)   Graduate school

  • 2023   国際情報学研究指導Ⅰ   Graduate school

  • 2023   国際情報学研究指導Ⅱ   Graduate school

  • 2023   研究の計画と遂行   Graduate school

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Committee Memberships

  • 2020    

    "The 15th International Conference on P2P, Parallel, Grid, Cloud and Internet Computing (3PGCIC-2020)"   Track Co-Chair  

  • 2020    

    The 15th International Conference on P2P, Parallel, Grid, Cloud and Internet Computing (3PGCIC-2020)   Track Co-Chair  

  • 2019    

    The 33rd International Conference on Advanced Information Networking and Applications (AINA2019)   Program Committee Member  

  • 2019    

    The 14th International Conference on P2P, Parallel, Grid, Cloud and Internet Computing (3PGCIC-2019)   Track Co-Chair  

  • 2019    

    第18回情報科学技術フォーラム (FIT2019)   研究会担当委員  

  • 2019    

    "The 14th International Conference on P2P, Parallel, Grid, Cloud and Internet Computing (3PGCIC-2019)"   Track Co-Chair  

  • 2016    

    電子情報通信学会 和文論文誌D, サイバーワールド特集号   編集幹事  

  • 2016    

    "電子情報通信学会 和文論文誌D, サイバーワールド特集号"   編集幹事  

  • 2015 -  

    International Workshop on Web Services and Social Media   Co-Chair  

  • 2014    

    The 17th International Conference on Network-Based Information Systems (NBiS2014)   Program Committee Member  

  • 2013 - 2014

    International Workshop on Web Services and Social Media (WSSM)   Program Committee Member  

  • 2014 -  

    電子情報通信学会 サイバーワールド特別研究専門委員会   幹事  

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