• Proceedings of the Korean Information Science Society Conference
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• 1998.10b
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• pp.632-634
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• 1998

기존의 객체기술은 재사용성과 유지보수 측면에서 많은 문제를 안고 있다. 해결책으로 여러 가지가 제시되었으나 그 중 객체지향 프레임웍을 기반으로 하여 시스템의 복잡도와 급증하는 크기 그리고 개방형 시스템의 구축 시에 발생하는 여러 가지 난제를 해결하고자 하였다. 그러나 프레임웍 연구는, 대부분 컴포넌트나 객체단위의 재사용성을 극대화하는데 초점이 맞추어져 있어서 소프트웨어의 유연성(flexibility)에 관한 문제는 별로 다루어지지 않고 있는 것이 현실이다. 따라서 본 논문은 소프트웨어 시스템 아키텍쳐 수준에서와 유지보수 차원의 유연성을 확보하는 방안으로 '핫 스팟 어댑터 모델'을 제안하고자 한다.

• Journal of the Korea Society of Computer and Information
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• v.1 no.1
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• pp.105-128
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• 1996

The maintenance cost accounts for over a half of all software costs. Maintenance tools can be used to reduce It. All other maintenance techniques. reverse engineering Is a process of analyzing source code to extract design information and to create representation of it In another form or at the higher level of abstraction. In this thesis. we propose a method to extract the call relationships among programs. the logic structure In program and the data flow of programs iron COBOL source Programs using reverse engineering. We also present a method to generate the structure chart of programs and modules. The structure chart generated from source code provides very important information to understand programs In details. The structure chart modified will be more helpful the maintainer to understand programs when he analyzes them later or others analyze them.

• Journal of Welding and Joining
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• v.22 no.3
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• pp.39-44
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• 2004

최근 국내외적으로 환경규제가 강화되면서 소형선의 경우 FRP선의 폐선처리가 문제시되면서 알루미늄선에 대한 관심이 고조되고 있다. 이러한 알루미늄선의 건조는 철강재 등 여러 재료에 비해 알루미늄은 비강도가 높아 경량화에 의한 고속화가 가능하고 높은 내식성에 의한 유지보수가 용이하며, 폐선시 재활용이 가능하여 환경 친화적이라는 이점이 있기 때문이다.(중략)

• Proceedings of the Korean Information Science Society Conference
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• 2011.06a
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• pp.170-173
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• 2011

본 논문에서는 모바일 소프트웨어 플랫폼 유지 보수성 개선 목표로 수행된 리엔지니어링 (Reengineering) 사례를 소개한다. 모바일 소프트웨어 플랫폼은 높아진 사용자 기능 요구 같은 대외적인 문제와 다양한 서비스 경쟁력 확보를 위한 제조사 내부적인 노력으로 인해 소프트웨어 규모와 복잡도가 급격히 증가하고 있는 상황이다. 기반 시스템으로서 모바일 소프트웨어 플랫폼은 기존 레거시(legacy) 시스템을 재사용하여 상품화를 수행하는 일반 임베디드 시스템 개발 특징과 이동 통신 사업자 요구사항 대응, 다양한 시장 및 다양한 하드웨어 빛 표준화 대응, 다양한 도메인 (domain) 이 하나의 기기에서 통합된 형태로 동작해야 한다는 점에서 다른 임베디드 시스템과 차별화된다고 볼 수 있다. 모바일 소프트웨어 플랫폼을 대상으로 한 성공적인 리엔지니어링 수행은 기반 시스템의 유지보수성 향상은 물론 연간 수십 개에 달하는 파생 시스템의 재사용성 및 생산성 향상을 기대할 수 있다. 본 연구에서는 사내 표준 프로세스를 재정의하고, 모바일 소프트웨어 플랫폼만의 특성을 고려하여 수행한 리엔지니어링 사례를 소개하고자 한다.

• Journal of the Korea Society of Computer and Information
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• v.3 no.1
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• pp.63-80
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• 1998

In object-oriented software development, reuse has been studied for the enhancement of software quality and software developer's productivity. But improper modeling in design phase and uncontrolled change during maintenance activities have a problem to reuse a class. In this paper we analyze a semantic cohesion of classes using C++ Program dependency graph, and slice a class with cohesion, so that this method supports the re-estimate of class quality and the extensibility of class. Therefore this proposed method in this paper increases the easibility of the restructuring in the reusable systems, when the developer selects a requested component for a object-oriented program development.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.43 no.1
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• pp.9-20
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• 2023

For highway concrete structures, the deterioration of the structure is accelerated due to the increase in the use of deicing materials, and sectional repair work is being frequently carried out to restore performance. However, after the repair work, re-damage such as cracks, delamination, and poor bond performance is exhibited in the repaired sectional area. In this study, overseas repair material requirements were first analyzed, and present domestic requirements were improved repair material performance through field surveys of common concrete structures, laboratory experiments, and test construction on a disused concrete bridge. In addition, performancebased quality requirements were presented so that all materials that meet the required performance can be applied, and different test methods for each material were unified into concrete test methods for consistent test results analysis. The considered performance requirements were compression strength, bending strength, and bond strength for structural properties, and length change rate, crack resistance, thermal expansion coefficient, and elasticity coefficient were for dimensional behavior. For resistance to chloride penetration resistance and freeze-thaw resistance were presented as durability. The proposed requirements for concrete repair materials are expected to contribute to the improvement of the quality of concrete sectional repair work in Korea.

• Resources Recycling
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• v.20 no.6
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• pp.19-27
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• 2011

This study was to draw a retentive concrete pavement that can reduce urban heat island which has become intensified according to the increase of buildings and paved roads. It used bottom ash, an industrial by-product that has retentive effect, as a replacement of fine aggregate. Meanwhile, in order to improve the decline of dynamic performance caused by bottom ash replacement, we manufactured specimen that metakaolin was added and we studied the characteristics of durable, ecological and retentive concrete through various experiments.

• Journal of the Korean Institute of Gas
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• v.20 no.5
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• pp.96-103
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• 2016

Proper repair methods of damaged city gas pipeline is important factor to safely transmit gas and to reduce economical loss caused by failure of gas pipelines. Repair methods such as surfacing, type-A and type-B welding and composite sleeve method have been used to repair damaged city gas pipelines. In this paper, among repair methods, composite sleeve repair methods were conducted since they are rather simple processes and their repair quality is not sensitive to workers' ability compared with other repair methods. We discussed composite repair processes especially using carbon fiber prepregs and the experimental results.

• Proceedings of the Korean Information Science Society Conference
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• 2000.04a
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• pp.522-524
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• 2000

본 연구에서는 통합 멀티미디어 통신시스템을 구축하기 위한 CASE 도구의 개발에서 시스템 구축에 필요한 객체를 설계, 확장하거나, 설계된 객체의 재사용성을 높이기 위한 방안으로 패턴지향형정보저장소를 설계하였다. 그리고 시스템 구축에 필요한 객체의 재사용시 중복성을 피하며 복잡도를 감소시키기 위해 CASE 도구의 설계단계에서 객체를 통합관리/이용할 수 있도록 하고, 재사용에 필요한 객체를 패턴화하여 저장함으로써 저장소의 재사용 효율성을 증가시킨다. 따라서 본 연구에서는 정보저장소에 저장된 패턴-객체의 재사용시 유지보수 비용을 감소시키고 멀티미디어의 특성을 수용할 수 있도록 표준화된 단일 패턴-객체와 이를 이용한 복합 패턴-객체로 확장 가능하도록 혼합형 정보저장소를 설계하였다.

• Korean Journal of Construction Engineering and Management
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• v.12 no.5
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• pp.103-116
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• 2011

Crack sealing is a maintenance technique commonly used to prevent water and debris penetration and reduce future degradation in pavement. In recent years, several systems for automatically routing and sealing pavement cracks have been developed in the highway construction and maintenance area. Automating pavement crack sealing can improve safety, productivity and quality, and reduce road user cost as well. The reduction in crew size and the increase in productivity of the automated sealing process will be translated directly into significant potential cost savings. The main objective of this study is to illustrate conceptual models for the development of the automated pavement crack sealer which meets domestic road condition and regulation, and to discuss its technical feasibilities. Conclusions are made concerning the applicability and the value of cantilever-typed pavement crack which is selected as the most feasible alternative in both economical and technical aspects.