Faculty Profiles - OHIRA Masao

Published Papers - OHIRA Masao

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An Investigation on Software Bug-Fix Prediction for Open Source Software Projects-A Case Study on the Eclipse Project

Akinori Ihara, Yasutaka Kamei, Akito Monden, Masao Ohira, Jacky Wai Keung, Naoyasu Ubayashi, Ken-ichi Matsumoto

2012 19TH ASIA-PACIFIC SOFTWARE ENGINEERING CONFERENCE WORKSHOPS (APSECW), VOL. 2 ( IEEE COMPUTER SOC ) 112 - 119 2012 [Refereed]

Open source software projects (OSS) receive a large number of bug reports from various contributors and developers alike, where many planned to be fixed by OSS developers. Given the next release cycle information, OSS users can be more effective and flexible in planning and to fix the bugs that are not to be fixed in the next release. It is therefore vital for OSS users to learn which bugs the OSS developers will fix, unfortunately such information may not be readily available, nor there is a prediction framework exists to serve such an important purpose. In this study, we would like to answer the question "Will this bug be fixed by the next release?", this is addressed by building a bug fixing prediction model based on the characteristics of a bug-related metric and by incorporating the progress of bug fixing measures such as status, period and developer metrics to provide aggregated information for the OSS users. The proposed model calculates the deviance of each variable to analyze the most important metrics, and it has been experimented using a case study with Eclipse platform. Result shows a bug fixing prediction model using both base metrics and state metrics provide significantly better performance in precision (139%) and recall (114%) than the standard model using only base metrics.

DOI

Good or Bad Committers? - A Case Study of Committer's Activities on the Eclipse's Bug Fixing Process.

Anakorn Jongyindee, Masao Ohira, Akinori Ihara, Ken-ichi Matsumoto

IEICE Trans. Inf. Syst. ( IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG ) 95-D ( 9 ) 2202 - 2210 2012 [Refereed]

There are many roles to play in the bug fixing process in open source software development. A developer called "Committer", who has a permission to submit a patch into a software repository, plays a major role in this process and holds a key to the successfulness of the project. Despite the importance of committer's activities, we suspect that sometimes committers can make mistakes which have some consequences to the bug fixing process (e.g., reopened bugs after bug fixing). Our research focuses on studying the consequences of each committer's activities to this process. We collected each committer's historical data from the Eclipse-Platform's bug tracking system and version control system and evaluated their activities using bug status in the bug tracking system and commit log in the version control system. Then we looked deeper into each committer's characteristics to see the reasons why some committers tend to make mistakes more than the others.

DOI

A System for Information Integration between Development Support Systems

Soichiro Tani, Akinori Ihara, Masao Ohira, Hidetake Uwano, Ken-ichi Matsumoto

3rd International Workshop on Empirical Software Engineering in Practice (IWESEP) 2011.11 [Refereed]

グローバル環境下におけるOSS開発者の情報交換に対する時差の影響

亀井靖高, 大平雅雄, 伊原彰紀, 小山貴和子, 松本真佑, 松本健一, 鵜林尚靖

情報社会学会学会誌 6 ( 2 ) 13 - 30 2011.11 [Refereed]

ソフトウェア開発における知識コラボレーション

大平雅雄, YE Yunwen, 中小路久美代, 山本恭裕

人工知能学会誌 ( 人工知能学会 ) 26 ( 1 ) 66 - 78 2011.01 [Refereed] [Invited]

Effects of a Synchronized Scoring Interface on Musical Quality.

Yuji Takai, Masao Ohira, Ken-ichi Matsumoto

Online Communities and Social Computing - 4th International Conference, OCSC 2011, Held as Part of HCI International 2011, Orlando, FL, USA, July 9-14, 2011. Proceedings ( Springer ) 363 - 372 2011 [Refereed]

DOI

A Quantitative Evaluation on the Software Use Experience with Electroencephalogram

Hitoshi Masaki, Masao Ohira, Hidetake Uwano, Ken-ichi Matsumoto

DESIGN, USER EXPERIENCE, AND USABILITY: THEORY, METHODS, TOOLS AND PRACTICE, PT 2 ( SPRINGER-VERLAG BERLIN ) 6770 469 - 477 2011 [Refereed]

In usability testing, experimenters need to perform a pre-training, so as to control software-use experiences of subjects. The pre-training in usability testing is very important because subjects' software-use experiences have a large effect on a result of a subjective evaluation of software. This paper aims to evaluate the software-use experiences quantitatively using EEG. We have conducted experiments to observe the relationships between subjects' software-use experiences and EEG in using software. As a result, we found that there was a significant difference between them.

DOI

An analysis of gradual patch application: A better explanation of patch acceptance

Passakorn Phannachitta, Pijak Jirapiwongy, Akinori Ihara, Masao Ohira, Ken-Ichi Matsumoto

Proceedings - Joint Conference of the 21st International Workshop on Software Measurement, IWSM 2011 and the 6th International Conference on Software Process and Product Measurement, MENSURA 2011 ( IEEE Computer Society ) 106 - 115 2011 [Refereed]

Patch submission has been known as one of the most important activities to sustain the open source software (OSS). The patch archive can be analyzed to procure many benefit cognizance for supporting the OSS project works. The recent models and methods that analyze the patches acceptance are quite rack of comprehensive
hence, complex activities such as a committer portioning the submitted patch out and accept are still excluded from the analysis. Therefore, the results derived from those methods would be inadequate to conclude the actual patch acceptance. In this research, we introduce an algorithm for analyzing patch acceptance including the partial and gradually accepted conditions. Validating our algorithm, we present our methods for indicating the partial and gradual application of the submitted patch between either mailing list and SVN or Bugzilla and CVS which are the commonly deployed patchactivities related system. We studied on two well known OSS projects
Apache HTTP and Eclipse Platform. We obtained a fascinating conclusion that larger patches have more confident to be accepted than the smaller contradicted to other analysis that came from the recent methods. © 2011 IEEE.

DOI

Good or bad committers? A case study of committers' cautiousness and the consequences on the bug fixing process in the eclipse project

Anakorn Jongyindee, Masao Ohira, Akinori Ihara, Ken-Ichi Matsumoto

There are many roles to play in the bug fixing process in open source software development. A developer called "Committer", who has a permission to submit a patch into software repository, plays a major role in this process and hold a key to the successfulness of the project. In this work, we have observed each committer activities from the Eclipse-Platform bug tracking system and version archives. Despite the importance of committer's activities, we suspected that sometimes committers can make mistakes, which have negative consequences to the bug fixing process. Our research focus on studying the consequences of each committer's activities to this process. We collected each committer's historical data and evaluated each of them by comparing the more cautiousness to less cautiousness committers. Then we looked deeper into each committer's characteristics to see the reasons why some committers tend to make mistakes more than the others. From our results, we would like to make a humbly suggestion to the OSS's committers to be aware of their importance to the projects and be cautious before doing their jobs. © 2011 IEEE.

DOI

CICRO: An Interactive Visual Interface for Crowd Communication Online.

Masao Ohira, Hitoshi Masaki, Ken-ichi Matsumoto

DOI

Community search: A collaborative searching web application with a user ranking system

Papon Yongpisanpop, Masao Ohira, Ken-Ichi Matsumoto

Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) ( Springer ) 6778 378 - 386 2011 [Refereed]

People are using search engine in daily life. But most of the tools that we have today treat information-seeking tasks as a transient activity. In this research paper we introduce a web application system that provides collaborative function and experts finding system. We develop a system that will help user to organize search result and to do the collaboration with others. With the new iterative algorithm, users will also gain more percentage of needed result and the system will be able to suggest the experts related to the search keyword. © 2011 Springer-Verlag.

DOI

ライトユーザを対象としたオンライン協調作曲支援システム

大平雅雄, 木村昌樹, 松本健一

ヒューマンインタフェース学会論文誌 12 ( 3 ) 21 - 31 2010.08 [Refereed]

A Time-Lag Analysis for Improving Communication among OSS Developers

Masao Ohira, Kiwako Koyama, Akinori Ihara, Shinsuke Matsumoto, Yasutaka Kamei, Ken-ichi Matsumoto

NEW FRONTIERS IN ARTIFICIAL INTELLIGENCE ( SPRINGER-VERLAG BERLIN ) 6284 135 - 146 2010 [Refereed]

In the open source software (OSS) development environment, a communication time-lag among developers is more likely to happen due to time differences among locations of developers and differences of working hours for OSS development. A means for effective communication among OSS developers has been increasingly demanded in recent years, since an OSS product and its users requires a prompt response to issues such as defects and security vulnerabilities. In this paper, we propose an analysis method for observing the time-lag of communication among developers in an OSS project and then facilitating the communication.

DOI

3rd International Workshop on Supporting Knowledge Collaboration in Software Development (KCSD2009)

Masao Ohira, Yunwen Ye

Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 6284 89 - 90 2010 [Refereed]

The creation of modern software systems requires knowledge from a wide range of domains: application domains, computer hardware and operating systems, algorithms, programming languages, vast amount of component libraries, development environments, the history of the software system, and users. Because few software developers have all the required knowledge, the development of software has to rely on distributed cognition by reaching into a complex networked world of information and computer mediated collaboration. The success of software development, therefore, hinges on how various stakeholders are able to share and combine their knowledge through cooperation, collaboration and co-construction. © 2010 Springer-Verlag.

DOI

Predicting re-opened bugs: A case study on the Eclipse project

Emad Shihab, Akinori Ihara, Yasutaka Kamei, Walid M. Ibrahim, Masao Ohira, Bram Adams, Ahmed E. Hassan, Ken-Ichi Matsumoto

Proceedings - Working Conference on Reverse Engineering, WCRE ( IEEE Computer Society ) 249 - 258 2010 [Refereed]

Bug fixing accounts for a large amount of the software maintenance resources. Generally, bugs are reported, fixed, verified and closed. However, in some cases bugs have to be re-opened. Re-opened bugs increase maintenance costs, degrade the overall user-perceived quality of the software and lead to unnecessary rework by busy practitioners. In this paper, we study and predict re-opened bugs through a case study on the Eclipse project. We structure our study along 4 dimensions: 1) the work habits dimension (e.g., the weekday on which the bug was initially closed on), 2) the bug report dimension (e.g., the component in which the bug was found) 3) the bug fix dimension (e.g., the amount of time it took to perform the initial fix) and 4) the team dimension (e.g., the experience of the bug fixer). Our case study on the Eclipse Platform 3.0 project shows that the comment and description text, the time it took to fix the bug, and the component the bug was found in are the most important factors in determining whether a bug will be re-opened. Based on these dimensions we create decision trees that predict whether a bug will be re-opened after its closure. Using a combination of our dimensions, we can build explainable prediction models that can achieve 62.9% precision and 84.5% recall when predicting whether a bug will be re-opened. © 2010 IEEE.

DOI

A Time-Lag Analysis Toward Improving the Efficiency of Communications among OSS Developers

Masao Ohira, Kiwako Koyama, Akinori Ihara, Shinsuke Matsumoto, Yasutaka Kamei, Ken-ichi Matsumoto

In Proceedings of The 3rd International Workshop on Knowledge Collaboration in Software Development (KCSD2009) 49 - 62 2009.11 [Refereed]

Temporal Changes of the Openness of An Oss Community: A Case Study of the Apache Http Server Community

Mizuki Yamamoto, Masao Ohira, Yasutaka Kamei, Shinsuke Matsumoto, Ken-ichi Matsumoto

In The 4th International Conference on Collaboration Technologies 2009 (CollabTech2009) 64 - 65 2009.08 [Refereed]

Q&Aコミュニティを対象とした回答の信頼性指標構築に向けた分析

瀧寛文, 森崎修司, 大平雅雄, 松本健一

情報社会学会誌 4 ( 1 ) 49 - 58 2009.06 [Refereed]

OSSコミュニティにおけるオープンコラボレーションの理解

松本真佑, 亀井靖高, 大平雅雄, 松本健一

情報社会学会学会誌 3 ( 2 ) 29 - 42 2009.03 [Refereed]

Webjig: An Automated User Data Collection System for Website Usability Evaluation

Mikio Kiura, Masao Ohira, Ken-ichi Matsumoto

HUMAN-COMPUTER INTERACTION, PT I ( SPRINGER-VERLAG BERLIN ) 5610 277 - 286 2009 [Refereed]

In order to improve website usability, it is important for developers to understand how users access websites. In this paper, we present Webjig, which is a Support system for website usability evaluation in order to resolve the problems associated with the existing systems. Webjig can collect users' interaction data from static and dynamic websites. Moreover, by using Webjig, developers can precisely identify users' activities on websites. By performing an experiment to evaluate the usefulness of Webjig, we have confirmed that developers could effectively improve website usability.

DOI

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Published Papers - OHIRA Masao