http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
전항력을 이용한 회전 블레이드 냉각성능 향상 방안 연구
박준수,Park, Jun Su 한국교통대학교 융복합기술연구소 2016 융ㆍ복합기술연구소 논문집 Vol.6 No.1
The serpentine internal passage is located in turbine blade and it shows the variety heat transfer distribution. Especially, the Coriolis force, which is induced by blade rotation, makes different heat transfer distribution of the leading and trailing surfaces of serpentine internal passage. The different heat transfer is one of the reasons why the serpentine cooling passage shows low cooling performance in the rotating condition. So, this study tried to design the advanced the serpentine passage to consideration of the Coriolis force. The design concept of advanced serpentine cooling is maximizing cooling performance using the Coriolis force. So, the flow turns from leading surface to trailing surface in advanced serpentine passage to match the direction of Coriolis force and rotating force. We performed numerical analysis using CFX and compared the existing and advanced serpentine internal passage. This design change is induced the high heat transfer distribution of whole advanced serpentine internal passage surfaces.
사우디 라빅발전소 터빈 블레이드 파손 분석기술 현장 적용
박준수,Park, Jun Su 한국전력공사 2021 KEPCO Journal on electric power and energy Vol.7 No.1
한전에서 운영중인 사우디라빅발전소에서 저압터빈 블레이드가 파손되었다. 블레이드의 경우 터빈의 핵심부품으로서 증기를 활용하여 발전기를 회전시켜 전기를 생산하는데 필수 부품이다. 반복적인 사고발생을 예방하기 위해 조직분석, 운전신호 분석등을 활용하여 원인을 규명하였고, 대책을 제시하였다.
다중모드 Cognitive Radio 통신 시스템을 위한 GBNSGA 최적화 알고리즘
박준수,박순규,김진업,김형중,이원철,Park, Jun-Su,Park, Soon-Kyu,Kim, Jin-Up,Kim, Hyung-Jung,Lee, Won-Cheol 한국통신학회 2007 韓國通信學會論文誌 Vol.32 No.3C
본 논문에서는 CR(Cognitive Radio)을 위해 사용자에게 최적의 통신 시스템 구성 변수들을 할당하기 위한 새로운 최적화 알고리즘인 GBNSGA(Goal-Pareto Based Non-dominated Sorting Genetic Algorithm)를 제안한다. 다중모드 선택적 CR 통신을 위해 사용되는 cognitive 엔진은 Mitola가 제안한 cognition 싸이클의 많은 논리 연산과정이 필요하다는 단점을 보완하기 위하여 일반적으로 유전자 알고리즘 기반의 접근 방식이 사용되고 있다. 본 논문에서는 cognitive 엔진의 효율적인 구동을 위하여 파레토(Pareto) 기반의 최적화 알고리즘인 NSGA(Non-dominated Sorting Genetic Algorithm)와 사용자 서비스의 요구사항을 goal로 설정하는 GP(Goal Programming)을 결합한 새로운 최적화 방법으로 GBNSGA를 제안하였으며, 시뮬레이션 수행을 통해 제안된 알고리즘이 요구사항에 적합한 다양한 해를 제공하고 최적화 수렴속도가 빠르다는 것을 확인하였다. This paper proposes a new optimization algorithm named by GBNSGA(Goal-Pareto Based Non-dominated Sorting Genetic Algorithm) which determines the best configuration for CR(Cognitive Radio) communication systems. Conventionally, in order to select the proper radio configuration, genetic algorithm has been introduced so as to alleviate computational burden along the execution of the cognition cycle proposed by Mitola. This paper proposes a novel optimization algorithm designated as GBNSGA for cognitive engine which can be described as a hybrid algorithm combining well-known Pareto-based NSGA(Non-dominated Sorting Genetic Algorithm) as well as GP(Goal Programming). By conducting computer simulations, it will be verified that the proposed method not only satisfies the user's service requirements in the form of goals. It reveals the fast optimization capability and more various solutions rather than conventional NSGA or weighted-sum approach.
제트홀이 설치된 핀-휜 및 핀-휜/딤플 복합 배열을 사용한 내부유로에서의 열전달 향상
박준수,Park, Jun Su 한국교통대학교 융복합기술연구소 2015 융ㆍ복합기술연구소 논문집 Vol.5 No.1
A Pin-fin array is widely used to enhance the heat transfer in the internal cooling passage. The heat transfer distribution around the pin-fin is varied by the horseshoe vortex and flow separation. The difference of heat transfer coefficient induces the large thermal stress, which is one of the major reasons to break of hot components. So, it is required to enhance the heat transfer on the back side of pin-fin to solve the thermal stress problem. This study suggests the pin-fin with inclined jet hole and complex pin-fin/dimple array to enhance the heat transfer on the back side of pin-fin. The heat transfer coefficient is predicted by the numerical analysis, which is performed by CFX 14.0. The numerical results are obtained at Reynolds number, 10,000. The results show that the heat transfer on the back side of pin-fin is increased in both cases. Beside, the wake, which comes from dimple and jet, helps to develop the horseshoe vortex and increase the heat transfer on the next row pin-fin.
박준수,Park, Jun Su 한국교통대학교 융복합기술연구소 2019 융ㆍ복합기술연구소 논문집 Vol.9 No.1
The government has designated the hydrogen industry as one of the three most innovative industries and is making a lot of investment and support. Chungcheongbuk-do and Chungju are developing strategies to foster local industries in line with these government policies. Hyundai Mobis's Chungju plant, located in Chungju, is the only fuel cell plant in Korea and is emerging as the center of hydrogen cars as the government's hydrogen mobility industry expands. Chungcheongbuk-do and Chungju City seek to attract relevant institutions and companies based on their regional strengths. In this paper, the current status of hydrogen industry in Chungcheongbuk-do and Chungju-si is discussed and future plans are discussed.
박준수 ( Jun Su Park ),곽병규 ( Byoung Kyu Kwak ),배은주 ( Eun Joo Bae ),이정진 ( Jeong Jin Lee ),김영훈 ( Young Hun Kim ),최경희 ( Kyung Hee Choi ),이종협 ( Jong Heop Yi ) 한국환경분석학회 2010 환경분석과 독성보건 Vol.13 No.1
As increasing use of nanoproducts including engineered nanomaterials, it is expected that the exposure of nanomaterials to the ecosystem increases. However, few methodology has been reported to evaluate impacts of nanoparticles on human health and environment. The potential impacts of nanoproducts can be assessed in terms of life cycle assessment (LCA). LCA is the systematic analysis of the resource usages and emissions over the life time from the primary resources to the moment of disposal. In this study, LCA methodology of nanomaterials and nanoproduct was proposed based on international standards (ISO14040-14044). Results of this study suggested that data on ecotoxicology and environmental fate and physicochemical characteristic of nanomaterials should be identified. In addition, database should be established on these preliminary data. Sustainable development of nanotechnology will be accomplished after the evaluation of environmental impact via LCA of nanomaterials.