• Proceedings of the Korea Information Processing Society Conference
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• 2010.04a
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• pp.989-992
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• 2010

리팩토링은 시스템의 기능 변경 없이 코드 구조를 재조정하여 가독성을 높이고 유지보수성을 향상하기 위함이다. 기존의 어스팩트 리팩토링은 프로그램의 특정 부분을 어스팩트로 정의하여 리팩토링하거나 구현된 어스팩트 명세를 재구성하는 방식으로, 객체지향 프로그램에 적용하는데 어려움이 있다. 본 논문은 객체지향 리팩토링에 어스팩트 개념을 적용하기 위한 구체화된 접근방법을 제시하는 것이 목적이며 이를 위해 프로그램 의존성 그래프를 이용한다. 리팩토링의 주요 어스팩트인 중복 코드는 프로그램 의존 그래프에서 노드 사이의 순서관계를 비교하여, 리팩토링을 위한 어스팩트 후보로 변환하며 이를 근거로 재조합 함으로써 캡슐화된 객체 내부의 리팩토링 요소를 편리하게 처리할 수 있다.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.11a
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• pp.857-858
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• 2009

최근의 소프트웨어 개발에서는 리팩토링이 일반적인 요소로서 활발하게 이용되고 있다. 리팩토링에 대한 관심이 높아지면서 리팩토링의 자동화와 리팩토링 재사용을 위한 조립에 대한 연구가 많이 진행되고 있다. 기존의 연구들에서는 리팩토링과 리팩토링 조립에 대해 선/후행조건을 각각 명세하고 있다. 하지만 리팩토링 조립의 경우에 대한 선/후행조건은 개별적인 리팩토링들의 선/후행조건들과 중복된 기능들이 대부분이며, 사용 가능한 리팩토링의 조립이 정적으로 고정되어 있음을 의미한다. 이에 본 연구에서는 리팩토링 조립의 경우가 고정되어 있지 않고 조립의 경우에 따른 선/후행조건의 추가적인 정의 없이 동적으로 다양하게 조립여부를 확인할 수 있도록 하고자 한다. 이를 위해 리팩토링의 동적 조립을 위한 전체 프레임워크를 제안하며 OCL 기반으로 리팩토링을 명세한다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2020.07a
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• pp.389-390
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• 2020

배포된 소프트웨어는 고객의 새로운 요구사항을 반영하면서 기능을 추가하거나 수정한다. 수정된 소프트웨어는 문제없이 동작하지만, 내부의 구조는 점점 더 복잡해지면서 유지보수가 어려워지고, 수정 시 버그 발생 확률이 높아지게 된다. 이에 따라 잘못된 코드 구조를 개선하고, 소프트웨어의 품질을 향상시켜야한다. 본 논문에서는 개발된 ERP 근태관리 시스템이 지속적인 요구사항을 반영하면서 발생한 잘못된 코드 구조인 코드 스멜을 탐지하고 분석하는 연구를 진행하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2022.11a
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• pp.85-87
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• 2022

고품질 코드를 위한 정적 분석은 아직도 매우 필요한 영역이며, 또한 코드의 가시화는 개발자들에게 코드의 복잡한 모듈에 대한 가이드에 필요하다. 기존의 코드 가시화는 정적 분석의 코드 내부 정보들을 DB 테이블화 및 품질 지표(CK Metrics, Coupling, # function Calls, Bed smell) 질의어화, 그리고 추출된 정보를 가시화하는 것에만 초점을 두었다. 문제는 코드 내부 정보(Class, method, parameters, etc) 테이블들에 대한 join 연산 시 엄청난 시간과 리소스가 소모된다. 이 문제를 해결하기 위해, 우리는 테이블 설계의 정규화를 제안한다. 또한 필요한 품질 지표의 질의를 통해 코드 내부 정보 추출하여 데이터 및 제어 복잡 모듈을 식별하여 refactoring 를 가이드 한다. 앞으로는 이 부분의 AI learning 을 통해 bad/good program 을 식별을 기대한다.

• KIPS Transactions on Software and Data Engineering
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• v.6 no.7
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• pp.337-352
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• 2017

Clone-and-own reuse is an approach to creating new software variants by copying and modifying existing software products. A family of legacy software products developed by clone-and-own reuse often requires high maintenance cost and tends to be error-prone due to patch-ups without refactoring and structural degradation. To overcome these problems, many organizations that have used clone-and-own reuse now want to migrate their legacy products to software product line (SPL) for more systematic reuse and management of software asset. However, with most of existing methods, variation points are embedded directly into design and code rather than modeled and managed separately; variation points are not created ("engineered") systematically based on a variability model. This approach causes the following problems: it is difficult to understand the relationships between variation points, thus it is hard to maintain such code and the asset tends to become error-prone as it evolves. Also, when SPL evolves, design/code assets tend to be modified directly in an ad-hoc manner rather than engineered systematically with appropriate refactoring. To address these problems, we propose a feature-oriented method for extracting a SPL asset from a family of legacy applications. With the approach, we identify and model variation points and their relationships in a feature model separate from implementation, and then extract and manage a SPL asset from legacy applications based on the feature model. We have applied the method to a family of legacy Notepad++ products and demonstrated the feasibility of the method.

• The KIPS Transactions:PartA
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• v.18A no.6
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• pp.271-280
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• 2011

Time-Triggered Architecture (TTA), one of real-time software design paradigms which executes tasks in timely manner, has long been advocated as being better suited in fore-sighting system behavior than event-triggered architecture (ETA). To gain this valuable feature of TTA, however, precise task designing process is mandatory. Alternatively, ETA tries to execute tasks whenever paired events are occurred. It provides intuitive and flexible basement to add/remove tasks and, moreover, better response time performance. However ETA is difficult to analyze because system behavior might be different depending on the order of interrupts detected by the system. Many previous researches recommended TTA when developing safety-critical real-time systems, but cost problem of task designing process and insufficient consensus for applying rigorous software engineering practice are still challenging in practice. This paper describes software refactoring process which applying TTA approach into ETA based embedded software in artificial heart system. We implemented dedicated interrupt monitoring program to capture existing tasks' real-time characteristics. Based on the captured information, proper task designing process is done. Real-time analysis using RMA (Rate-Monotonic Analysis) verified that new design guarantees timeliness of the system. Empirical experiments revealed that revised design is as efficient, when measured in terms of system's external output, as the old design and enhances predictability of the system behavior as well.

• Journal of Internet Computing and Services
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• v.9 no.2
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• pp.107-118
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• 2008

The XP, the representative methodology of Agile software development, maximizes the effectiveness of the development by focusing on development itself and using primitive and basic process definition that can be easily implemented in the fields. However, the most of XP's practices came from those of engineering and the manogement practices of work product tend to be overlooked. The research on the implementation of those manogement practices has not been performed enough. Because of deficiency of processes that guide the change control over major baselines of work product and that describe proper continuous integration and refactoring in XP, the integrity of those work products is difficult to be guaranteed. To fulfill this work product integrity, CM(configuration manogement) should be hired and CMMI(Capability Maturity Model Integration) is considered to be the best references for that purpose, CMMI defines the required practices of CM and leave implementation details to the organization so that it could customize those practices based on the characteristics of its development methods. The CM process implementation guidelines based on CMMI could provides work product integrity with a way of keeping XP's agility that includes continuous integration, refactoring and small release. In this research, we selected CM process factors applicable to XP among CMMI's CM practices and based on them we developed the CM implementation guidelines.

• Journal of Microbiology and Biotechnology
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• v.29 no.12
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• pp.1931-1937
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• 2019

The heterologous expression of the Streptomyces natural product (NP) biosynthetic gene cluster (BGC) has become an attractive strategy for the activation, titer improvement, and refactoring of valuable and cryptic NP BGCs. Previously, a Streptomyces artificial chromosomal vector system, pSBAC, was applied successfully to the precise cloning of large-sized polyketide BGCs, including immunosuppressant tautomycetin and antibiotic pikromycin, which led to stable and comparable production in several heterologous hosts. To further validate the pSBAC system as a generally applicable heterologous expression system, the daptomycin BGC of S. roseosporus was cloned and expressed heterologously in a model Streptomyces cell factory. A 65-kb daptomycin BGC, which belongs to a non-ribosomal polypeptide synthetase (NRPS) family, was cloned precisely into the pSBAC which resulted in 28.9 mg/l of daptomycin and its derivatives in S. coelicolor M511(a daptomycin non-producing heterologous host). These results suggest that a pSBAC-driven heterologous expression strategy is an ideal approach for producing low and inconsistent Streptomyces NRPS-family NPs, such as daptomycin, which are produced low and inconsistent in native host.

• Journal of Multimedia Information System
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• v.4 no.4
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• pp.255-262
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• 2017

In recent software development, repetitive code fragments (i.e., clones) are common due to the copy-and-paste programming practice, the framework-based development, or the reuse of same design patterns. Such similar code fragments are likely to introduce more bugs but are easily disregarded by a code reviewer or a programmer. In this paper, we present a code review tool to help code reviewers identify important code changes written by other programmers and recommend which changes need to be reviewed first. Specifically, to identify important code changes, our approach detects code clones across revisions and investigates them. Then, to help a code reviewer, our approach ranks the identified changes in accordance with several software quality metrics and statistics on those clones and changes. Furthermore, our approach allows the code reviewer to express their preferences during code review time. As a result, the code reviewer who has little knowledge of a code base can reduce his or her effort by reviewing the most significant changes that require an instant attention. To evaluate our approach, we integrated our approach with a modern IDE (e.g., Eclipse) as a plugin and then analyzed two third-party open source projects. The experimental results indicate that our approach can improve code reviewer's productivity.

• Journal of the Korea Society of Computer and Information
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• v.15 no.7
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• pp.99-108
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• 2010

For effective maintenance for web applications, it is necessary to improve the readability of the source pages. Though CSS(Cascading Style Sheet) belongs to pure presentation layer in various web constituent entities, CSS codes are often used by inlning and they are sometimes automatically generated by web development tools. The existing studies on CSS optimization have only focused on reducing the size of codes and they did not incorporate the readability or the reusability. In this paper, CSS codes are structured and several criteria for readability are defined to improve the readabilty and reusability. Based on them, the algorithm to improve the readability are proposed. Finally, case study are presented to show the applicability of the proposed algorithm.