Faculty Profiles - OHIRA Masao

Published Papers - OHIRA Masao

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An Exploratory Analysis for Studying Software Evolution: Time-Delayed Correlation Analysis

Yosuke Yamatani, Masao Ohira

2014 6TH INTERNATIONAL WORKSHOP ON EMPIRICAL SOFTWARE ENGINEERING IN PRACTICE (IWESEP 2014) ( IEEE ) 13 - 18 2014 [Refereed]

We propose an exploratory analysis method for software repositories so that you can study software evolution without an explicit goal. The method extends the traditional correlation analysis to consider a time lag between any pair of metrics. Using data collected from three kinds of repositories, the method automatically calculates optimal parameters to deal with a time lag between metrics and returns the highest correlation coeffcient for each pair of metrics. Our case study using one hundred metrics data from three OSS projects shows that the method allows us to find unexpected relationships in some pairs of metrics if we only use the traditional correlation analysis and that using such relationships can be used to build an analysis goal to understand software evolution.

DOI

Early Identification of Future Committers in Open Source Software Projects

Akinori Ihara, Yasutaka Kamei, Masao Ohira, Ahmed E. Hassan, Naoyasu Ubayashi, Ken-ichi Matsumoto

2014 14TH INTERNATIONAL CONFERENCE ON QUALITY SOFTWARE (QSIC 2014) ( IEEE COMPUTER SOC ) 47 - 56 2014 [Refereed]

There exists two types of developers in Open Source Software (OSS) projects: 1) Committers who have permission to commit edited source code to the Version Control System (VCS), 2) Developers who contribute source code but cannot commit to the VCS directly. In order to develop and evolve high quality OSS, projects are always in search of new committers. OSS projects often promote strong developers to become committers. When existing committers find strong developers, they propose their promotion to a committer role. Delaying the committer-promotion might lead to strong developers departing from an OSS project and the project losing them. However early committer-promotion comes with its own slew of risks as well (e.g., the promotion of inexperienced developers). Hence, committer-promotion decisions are critical for the quality and successful evolution of OSS projects. In this paper, we examine the committer-promotion phenomena for two OSS projects (Eclipse and Firefox). We find that the amount of activities by future committers was higher than the amount of activities by developers who did not become committers). We also find that some developers are promoted to a committer role very rapidly (within a few month) while some of developers take over one year to become a committer. Finally, we develop a committer-identification model to assist OSS projects identifying future committers.

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A Pilot Study of Diversity in High Impact Bugs

Yutaro Kashiwa, Hayato Yoshiyuki, Yusuke Kukita, Masao Ohira

2014 IEEE INTERNATIONAL CONFERENCE ON SOFTWARE MAINTENANCE AND EVOLUTION (ICSME) ( IEEE COMPUTER SOC ) 536 - 540 2014 [Refereed]

Since increasing complexity and scale of modern software products imposes tight scheduling and resource allocations on software development projects, a project manager must carefully triage bugs to determine which bug should be necessarily fixed before shipping. Although in the field of Mining Software Repositories (MSR) there are many promising approaches to predicting, localizing, and triaging bugs, most of them do not consider impacts of each bug on users and developers but rather treat all bugs with equal weighting, excepting a few studies on high impact bugs including security, performance, blocking, and so forth. To make MSR techniques more actionable and effective in practice, we need deeper understandings of high impact bugs. In this paper we report our pilot study on high impact bugs, which classifies bugs reported to four open source projects into six types of high impact bugs.

DOI

Predicting the Bug Fixing Time Based on the Bug Assignment Patterns in OSS Development

正木仁, 大平雅雄, 伊原彰紀, 松本健一

情報処理学会論文誌ジャーナル(CD-ROM) 54 ( 2 ) 933 - 944 2013.02 [Refereed]

Predicting the Bug Fixing Time Based on the Bug Assignment Patterns in OSS Development

正木仁, 大平雅雄, 伊原彰紀, 松本健一

情報処理学会論文誌 ( 情報処理学会 ) 54 ( 2 ) 933 - 944 2013.02 [Refereed]

大規模OSSプロジェクトには日々大量の不具合が報告されており，不具合修正時間（OSSプロジェクトに報告された不具合が解決するまでに要する時間）をより正確に見積もることが重要になってきている．OSSプロジェクト管理者は，次期バージョンのリリースまでにどの不具合を修正すべきかを判断しなければならないためである．しかしながら，不具合の修正範囲の大きさや問題の複雑さの違い，ボランティアを主体とする開発者のスキルセットの違いなどの要因によって，個々の不具合の修正時間を見積もることは容易ではない．そのため近年，OSS開発における不具合修正時間の予測に関する研究がさかんに行われている．本論文では，不具合割当てパターンを用いて不具合修正時間の予測モデルを構築する．不具合割当てパターンとは，不具合修正タスク割当て時の不具合報告者・管理者・修正担当者の3者の社会的関係を分類したものである．不具合割当てパターンの違いにより，修正作業にとりかかるまでの時間および修正作業自体に要する時間はそれぞれ大きく異なることが知られている．従来研究の多くは不具合情報（重要度や優先度など）に基づいて予測モデルを構築しているが，不具合管理パターンを考慮することでさらなる予測精度の向上を期待できる．本論文では，Eclipse PlatformおよびJDTを対象として構築した予測モデルの評価を行った．実験の結果，不具合割当てパターンが不具合修正時間の予測精度向上に寄与するとともに，指定期間内（1週間以内など）に不具合修正が完了するか否かの判断を支援できることが分かった．さらに，本予測モデルを利用することで，Platformで約16%，JDTで約10%多くの不具合を修正可能と判断できることが分かった．The number of reported bugs has been increasing especially in large-scale open source software (OSS) projects. Project managers in the projects have to decide which bugs should be resolved until they release the next version of their products. However it is not easy to estimate the time to resolve each bug due to the differences of the size of required modifications, the difficulty of each modification, skill set of each developer, and so forth. To address this issue, many studies have tried to predict the bug fixing time in OSS development. In this paper we constructs a prediction model for the bug fixing time, using the bug assignment patterns which have an impact on developer's performance of fixing bugs. The bug assignment patterns categorize the social relationships among bug reporters, managers, and developers in assigning bug fixing tasks. While most studies in the past only used the information extracted from bug reports itself, taking the bug assignment patterns into account would lead to prediction results with higher accuracy. Using data from the Eclipse Platform and JDT projects, we evaluates the prediction model. As a result, we found that the bug assignment patterns improved the prediction accuracy and help OSS managers make sure if a target bug will be resolved in a specified period (e.g., one week). We also found that our prediction model can contribute to resolve more bugs until the specified release (about 16% in Platform and about 10% in JDT).

A new perspective on the socialness in bug triaging: A case study of the eclipse platform project

Masao Ohira, Hayato Yoshiyuki

2013 5th International Workshop on Social Software Engineering, SSE 2013 - Proceedings 29 - 32 2013 [Refereed]

This paper explores how social relationships among developers impact on the efficiency of bug fixes. From the case study of the Eclipse Platform project, we found that (1) past achievements of bug triaging by particular pairs of assignors and fixers do not necessarily impact on the time to fix bugs, (2) rather, the time required to fix a bug can depend on who assigns the bug fixing task to a fixer. These findings would imply that we need to not only consider who should fix this bug? but also take into account a fixer's perspective who should assign this bug? or who should ask to whom?, in order to better support the bug triaging process. Copyright 2013 ACM.

DOI

OSS開発における不具合修正プロセスの現状と課題:不具合修正時間の短縮化へ向けた分析

伊原彰紀, 大平雅雄, 松本健一

情報社会学会誌 6 ( 2 ) 5 - 16 2012.03 [Refereed]

A Candidate Committer Prediction Based on Developer Activities in Open Source Software Projects

伊原彰紀, 亀井靖高, 大平雅雄, 松本健一, 鵜林尚靖

( 電子情報通信学会 ) 2012.02

本論文では，オープンソースソフトウェア（OSS）プロジェクトに参加する一般開発者の中からコミッターに推薦されるべき有能な開発者（コミッター候補者）を見つけ出すことを目的とする．近年，数百件もの不具合がプロジェクトに日々，報告されている現状から，コミッターへの過度な負担が原因となり不具合修正の長期化を招いている．コミッターの負担を軽減させるためにコミッターを増員するという手段があるが，プロジェクトに参加する一般開発者の中からコミッター候補者を見つけることは容易ではない．本論文では，コミッター候補者を見つけ出すために既存コミッターの過去の活動とその活動量を分析し，コミッター予測モデルを構築した．モデル構築には，コミッター候補者と一般開発者の活動（パッチの投稿，パッチの検証，開発に伴う議論）履歴とプロジェクトでの活動期間を用いた．分析の結果，継続的にパッチの投稿，パッチの検証を行う開発者がコミッターに昇格していることが分かった．また，構築したコミッター予測モデルは，ランダムに予測する場合に比べて予測精度が5～7倍高いことが分かった．

Lessons Learned from Collaborative Research in Software Engineering: A Student's Perspective.

Anakorn Jongyindee, Pattara Leelaprute, Masao Ohira, Ken-ichi Matsumoto

13th ACIS International Conference on Software Engineering, Artificial Intelligence, Networking and Parallel/Distributed Computing, SNPD 2012, Kyoto, Japan, August 8-10, 2012 ( IEEE Computer Society ) 494 - 497 2012 [Refereed]

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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.

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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]

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]

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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.

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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.

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CICRO: An Interactive Visual Interface for Crowd Communication Online.

Masao Ohira, Hitoshi Masaki, Ken-ichi Matsumoto

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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.

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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]

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.

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Published Papers - OHIRA Masao