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박재홍(Jae-Hong Park),조성열(Sung-Youl Cho),김정규(Jung-Kyu Kim),양명국(Myeong-Kuk Yang),허인은(In-Eun Hur),고성규(Seong-Kyu Ko),임혁(Hyug-Lim),현용익(Yong-Ik Hyun) 한국유체기계학회 2009 유체기계 연구개발 발표회 논문집 Vol.2009 No.-
Applications of the plate heat exchanger are being expanded in ships and marine plants. Marine engine L.O(lubricant oil) cooler is one of the applications of the plate heat exchanger. It has very important role as engine radiator in the ship. Lubricant oil is flowed inside ship engine like the land engine and temperature is up to 80~90℃. Some L.O coolers are mounted in the front of the engine, and operating pressure is up to 4~8 ㎏/㎠. Because vibration of engine is passed to L.O cooler, anti-vibration is required. New L.O cooler for medium speed marine engine was developed, and its performance was evaluated by test and provided in this paper.
스네이크 패턴을 가진 대면적 판형 열교환기의 전열성능에 관한 연구
김정규(Jung-Kyu Kim),박재홍(Jae-Hong Park),조성열(Sung-Youl Cho),양명국(Myeong-Kuk Yang),허인은(In-Eun Hur),고성규(Seong-Kyu Ko),임혁(Hyug-Lim),현용익(Yong-Ik Hyun) 한국유체기계학회 2009 유체기계 연구개발 발표회 논문집 Vol.2009 No.-
In view of space saving, the design of more compact heat exchangers is important. Also, to meet the demands for saving energy and resources today, manufacturers have tried to enhance efficiency and reduce the size and weight of heat exchangers. Over the past decades, there have been tremendous advancements in the manufacturing technology of high efficiency heat exchangers. This has allowed the use of high performance(high heat transfer coefficient and low pressure drop) heat exchangers. Consequently, the use of high performance heat exchanger becomes popular in the design of heat exchangers. When compared with the well-established shell and tube heat exchangers, the plate heat exchanger shows a lot of advantages like high NTU values, compactness, low cost, multi duties and reduced fouling etc. For the higher performance in plate heat exchanger, the snake pattern in the heat transfer plate has been developed instead of the conventional herringbone pattern. The performance of the plate heat exchanger with snake pattern was evaluated by test, and provided in this paper.
지역냉방 시스템용 초고효율 판형 열교환기 개발에 관한 연구
박재홍(Jae-Hong Park),임혁(Hyug-Lim),조성열(Sung-Youl Cho),강인성(In-Sung Kang),김정규(Jung-Kyu Kim),허인은(In-Eun Hur),고성규(Seong-Kyu Ko),곽승식(Sung-Sik Kwak),김종재(Jong-Jae Kim) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.10
Plate heat exchanger consists of thin, rectangular, pressed sheet metal plates that are sandwiched between full peripheral gaskets and clamped together in a frame. The frame has a fixed end-cover plate, fitted with the connecting ports, which is bolted together with a movable cover plate to hold the embossed plates in between; the top and bottom carrying bars allow proper alignment of the plate stacks. When compared with the well-established shell and tube heat exchangers, the plate heat exchanger shows a lot of advantages like high NTU values, compactness, low cost, multi duties and reduced fouling etc. Plate heat exchangers are often used to transfer heating or cooling water which is produced in the energy production( district heating or district cooling) facilities to residential areas and industrial parks. The district cooling systems of Middle East are the biggest market of plate heat exchanger, but the technical specifications for cooling system are different from the domestic one. To achieve its specifications, the new plate heat exchanger was developed, and its thermal performance results are introduced in this paper.
양명국(Myeong-Kuk Yang),임혁(Hyug Lim),현용익(Yong-Ik Hyun),박재홍(Jae-Hong Park),조성열(Sung-Youl Cho),김정규(Jung-Kyu Kim),허인은(In-Eun Hur),고성규(Seong-Kyu Ko),손성기(Seong-Ki Son) 한국마린엔지니어링학회 2009 한국마린엔지니어링학회 학술대회 논문집 Vol.2009 No.-
In view of space saving, the design of more compact heat exchangers is relatively important. Also, to meet the demand for saving energy and resources today, manufacturers are trying to enhance efficiency and reduce the size and weight of heat exchangers. Over the past decade, there has been tremendous advancement in the manufacturing technology of high efficiency heat exchangers. This has allowed the use of smaller and high performance heat exchangers. Consequently, the use of smaller and high performance heat exchanger becomes popular in the design of heat exchangers. Welded compact plate heat exchanger is used in high temperature and pressure. In the design of heat exchanger, it is necessary to understand the heat transfer and frictional characteristics, so performance data are provided to help design of this type heat exchanger.
무선 애드 혹 네트워크 환경에서 정삼각형을 이용한 효율적인 브로드캐스팅 프로토콜
허인 ( In Hur ),리트롱덕 ( Trong Duc Le ),추현승 ( Hyunseung Choo ) 한국정보처리학회 2009 한국정보처리학회 학술대회논문집 Vol.16 No.1
브로드캐스팅 프로토콜은 무선 애드 혹 네트워크에서 컨트롤 메시지를 전체 노드에 전송하기 위한 목적으로 널리 사용된다. 전통적인 브로드캐스팅 프로토콜은 모든 노드가 처음 받은 메시지를 재전송하기 때문에 극심한 중복전송과 충돌문제가 발생한다. 이러한 문제를 해결하기 위해 최근에 효율적으로 재전송노드를 줄이기 위한 브로드캐스팅 기법들이 제안되었지만 여전히 다수의 불필요한 재전송이 발생한다. 제안 기법은 1-홉 이웃노드의 위치정보를 이용하여 전파반경에 내접하는 정삼각형의 꼭짓점을 구하고 각 꼭짓점에 가장 가까운 이웃노드를 재전송노드로 선택한다. 우리는 먼저 재전송 노드를 최소화하기 위한 이상적인 모델을 제시하고 이상적인 모델에 근접하기 위한 방법을 설명한다. 시뮬레이션 결과를 통해 제안 기법이 기존의 효율적인 브로드캐스팅 프로토콜보다 성능이 우수하며 재전송 노드수가 lower bound에 근접하는 것을 보여준다.
허인 ( In Hur ),이상민 ( Sang-min Lee ) 한국질서경제학회 2015 질서경제저널 Vol.18 No.4
본 연구의 목적은 지난 20년간 국내의 공공부문 노사관계 연구 성과를 살펴보고 그 특징과 관련 학문의 경향성을 분석하여 향후 발전 방향을 모색하고자 하는 것이다. 분석틀로는 공공부문 노사관계 시스템 모델을 구성하고 이에 따라 주제를 분류 하였으며, 세부 분석 기준을 마련하여 전공학문별 연구방법에 대해 분석하였다. 시기의 구분은 공공부문 노사관계가 정부의 노사관계 정책에 따라 결정적인 영향을 받게 되는 특성을 고려하여 각 정부의 집권기간을 기준으로 삼았다. 분석대상 논문은 ‘학술정보서비스(Research Information Sharing Service)’에서 공공부문, 공기업, 교원의 검색어와 노동조합, 노사관계의 검색어를 조합하여 검색된 논문 중 학술 등재지에 등록되어 있는 115편의 논문을 선별한 후 분석 기준에 따라 연구를 진행하였다. 분석 결과는, 첫째, 국내의 공공부문 노사관계 연구 경향은 정부의 법, 제도 시행과 같은 정치·사회적 환경과 밀접한 연관성을 보였지만, 민간부문과 차별화된 기준을 가지고 공공부문 노사관계의 특성을 밝히는 연구는 미진한 것으로 나타났다. 둘째, 다양한 전공학문과 연구 성과를 연관 지어 보면, 각 학문은 선호하는 분석대상과 주제, 방법론에서 각기 다른 양상을 보이고 있어 각 전공 연구자들이 접근한 주제 영역이 공공부문 자체의 특성과 관련한 영역이라기보다는 각 학문영역의 한 사례로써 공공부문 노사관계 영역을 활용하는 것이라고 볼 수 있다. 셋째, 최근의 학문적 풍토를 반영하여 양적 연구방법을 활용한 연구가 급격하게 증가하는 추세에 있다는 것을 알 수 있었다. 이러한 연구결과를 바탕으로 향후 공공부문 노사관계 연구에 대한 발전 방향을 제시하였다. The purpose of this study is to review academic research on industrial relations in public sector and to suggest future research directions in analyzing 115 articles drawn from Research Information Sharing Service (RISS). To analyze the articles for the last 20 years, we classify the research based on the system of analysis we make, considering theories, subjects, disciplines and methods. We distinguish the relevant articles according to the President’s term because the industrial relations outcome in public sector has been influenced by the policies of ruling government. There are four major points from our research. First, the research tends to focus on industrial relations actors and rule-setting process reflecting the fact that industrial relations in public sector has been mainly developed in subjects of government’s reformation policy on public sector and trade unions’ responses, and trade union’s action following to legalization of the Public Employees Union and Teachers Union. Second, in terms of academic discipline we find that research has been published mainly in Public Administration journal than Industrial Relations. We speculate industrial relations in public sector has been involved in Korean government’s policy. Interestingly, Public Administration deals with public employees in and of themselves, while Management and other social science addresses on public enterprise. Third, to take a look at the level of analysis we find the trends of more national level studies in Law, more industrial level analyses in Public Administration, and more individual level research in Management. Finally, regarding research methodology we find that deductive approach using statistics has been increasingly developed in recent years. Based on such points we analyse, our conclusion is as below: First, research topics on industrial relations in public sector are accounted of the law and institution setting and their enforcement as political context, while the research has not attracted little attention to the comparison from its private sector. Second, the research tends to address certain issues that certain discipline focuses on, instead of attempt to find and explore wider range of interdisciplinary subjects and methods. Third, we find the research trend that quantitative research methods are increased using statistics analysis. In conclusion, we summarize the issues that will need to be considered in future research directions on industrial relations in public sector and identify the limitations of our analysis.
[연료·윤활유부문] SI 엔진에서 연료 조기 증발을 위한 세라믹 히터 장치의 개발
허인(In Hur),전흥신(Heungshin Jeon),김경훈(Kyunghoon Kim) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_1
When some amount of liquid makes impact against the hot wall surface. in spray cooling and evaporating type combustor( I), and after impacting liquid changes into fine panicles and then disperses or evaporates. By using PTC heater. it makes high temperature( 180℃) wall surface. Gasoline is injected on this wall surface provided .characteristics of injected flow rate arc measured. Also. the processes of impacting against wall surface are taken by 35mm camera. As gasoline is impacted on heated wall surface and unheated wall surface. The amount of vaporization are obtained each.<br/> In this study. both evaporation rate of heated wall surface and that of unheated wall surface are measured. The evaporation rate impacted against high temperature is far superior to that which is depending on only impacting.