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가스터빈 고효율화 기술적용에 따른 복합화력발전소의 성능 특성 연구
김창주(Chang Ju Kim),원주목(Ju Mok Won),손창민(Chang Min Son) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
Combined cycle power (CCP) plant using LNG plays key role in electric supply including nuclear and coal power generation systems. Power reduction of gas turbine during summer can be recovered if gas turbine intake cooling system can be implemented in existing LNG based CCP plants. Furthermore, steam injection, turbine cooling air precooling and turbine case cooling technologies can be considered for enhancing power and efficiency of CCP plants. Such approaches are being widely studied in global gas turbine society. The present study aims to investigate net benefit of implementing those technologies for enhancing power and efficiency of an existing LNG based CCP. For performance comparison, (1) gas turbine intake cooling system, (2) steam injection, and (3) turbine cooling air precooling technologies are implemented to Busan LNG CCP plant
종횡비 변화에 따른 사각실린더 주위의 유동 특성에 관한 수치적 연구
박용갑(Yong Gap Park),손창민(Chang Min Son) 대한설비공학회 2010 설비공학 논문집 Vol.22 No.8
We investigate two-dimensional laminar flow around rectangular cylinders placed in a uniform stream. Numerical simulations are performed, using finite volume method, in the ranges of 50≤Re≤150 and 0.1≤W/H≤1.0, where Re and W/H are the Reynolds number and the width-to-height ratio, respectively. The immersed boundary method is used to handle the rectangular cylinder in a rectangular grid system. Comparisons with the previous results show good agreement in Strouhal number, drag and lift coefficient. The present study reports the detailed information of flow structure at different width-to-height ratios in the ranges of 50≤Re≤150.
절차중심 시스템으로부터 객체추출 방법 및 도구개발에 관한 연구
김정종(Kim Jung Jong),손창민(Son Chang Min) 한국정보처리학회 1998 정보처리학회논문지 Vol.5 No.3
If there is redeveloping into the system applying the object-oriented paradigm, productivity improvement of software through reuse would be accomplished and maintenance cost be reduced. When a procedure-oriented system is transformed to a type applying the object-oriented paradigm, various techniques are studied to extract objects from source code automatically or semi-automatically. However, it is not easy to extract conceptual objects when those techniques are applied. This problem entails another problem which drops the conceptual integrity of the extracted objects. In this paper, we suggest an object extraction method and tool development to resolve the problem occurring at the time when the programs developed through procedure-oriented is transformed to an object-oriented system. The suggested method allow to extract the desired objects using object modeling for various application domains of the real world given source code and design recovery information. During the extraction process, functionality and global variables of the source code as well as its interface are rigorously analyzed. This process can enhance the conceptual integrity of the objects and make easy to construct class hierarchies.