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      • LiBr 수용액 내 탄소강의 부식에 표면처리가 미치는 영향

        유주현(Juhyun Yoo),한상무(Sangmoo Han),남영광(Youngkwang Nam),정시영(Siyoung Jeong) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.-

        In absorption machines, various surface treatment methods such as shot-peening are applied to reduce the corrosion of carbon steel heat exchangers. Although a shot-peening process was proven to be beneficial in the fatigue corrosion, but its effect on pitting corrosion has been rarely investigated. Therefore, the present study aims to figure out the effects of the surface treatment in local corrosion resistance including pitting corrosion under operating conditions of triple effect absorption chiller. In this study, the mass loss by the corrosion was measured using the gravimetric method. Also, the maximum corrosion depth and the corrosion shape were analyzed using the contact profiler and the field emission scanning electron microscope(FE-SEM). The results show that the shot-peening treatment is effective in the suppression of both general corrosion and local corrosion. The results of this study are expected to be applied effectively to predict and reduce the corrosion in absorption chillers using LiBr aqueous solution.

      • KCI우수등재

        연어 관계 분석을 통한 Java API 패턴 추출 및 추천 방법

        권찬우(Chanwoo Kwon),황상원(Sangwon Hwang),남영광(Youngkwang Nam) Korean Institute of Information Scientists and Eng 2017 정보과학회논문지 Vol.44 No.11

        Many developers utilize specific APIs to develop software, and to identify the use of a particular API, a developer can refer to a website that provides the API or can retrieve the API from the web. However, the site that provides the API does not necessarily provide guidance on how to use it while it can be partially provided in many other cases. In this paper, we propose a novel system JACE (Java AST collocation-pattern extractor) as a method to reuse commonly-used code as a supplement. The JACE extracts the API call nodes, collocation patterns and analyzes the relations between the collocations to extract significant API patterns from the source code. The following experiment was performed to verify the accuracy of a defined pattern: 794 open source projects were analyzed to extract about 15M API call nodes. Then, the Eclipse plug-in test program was utilized to retrieve the pattern using the top 10 classes of API call nodes. Finally, the code search results from reference pages of the API classes and the Searchcode [1] were compared with the test program results.

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