냉매 R717과 HRC134a를 작동유체로 이용한 냉동장치의 성능특성에 관한 연구

김성배,김병철,하옥남 朝鮮大學校 機械技術硏究所 2007 機械技術硏究 Vol.10 No.1

Nowadays HCFCs refrigerants are restricted because it causes the depletion of ozone layer. However, natural gases such as ammonia as an organic compound, propane and propylene as hydrocarbon are easy and cheap to obtain as well as environmental. Accordingly, this experiment apply the R717 and HFC134a to study the performance characteristic from the superheat control and compare the energy efficiency of two refrigerants from the high performance. The condensing pressure of refrigeration system is increased from 15bar to 16bar and degree of superheat is increased from O℃ to 5℃ at each condensing pressure. As the result of experiment, when comparing the each COP, we knew the R717 is suitable as the alternative refrigerant of the HFC134a.

문학교육과 신자유주의 세계체제

김승환 한국문학교육학회 1999 문학교육학 Vol.3 No.-

We have been confronted with the unexpecting situation of the economic crisis last two years. Under the half-colonial economic management of IMF, most Korean realized our political and economic system is so fragile that we should scrutinize over the reason and process of that situation. We have two important themes about our Nation, the one is the unification of north and south Korea, the other is the development and prosperity of the nation. When we met with the worst economic hangover we concerned about the feature of our nation. Most important thing we have to know is history of the world and relationship between Korean history and World history. New-liberalism came before we know it, that is new ideology of science of the intelligence and financial capitalism. Then, what could we do under such fluctuation? What should we prepare for the literature education of the 21th? I would say several brief items for the literature education of the 21th century. First, we'd rather prepare literature education under the union of two nation, south and north Korea. Second, we can seek for the imagined community of Korea through legacy of traditional literature. Third, we must undertake literature education from the East-Asian point of view. Forth, we need unification-oriented way of life and open mind of literary teacher for the unification. Fifth, education process, content of the education items, publishing of the textbook should be designed for overcome such divided system. One state want to control the general education and their own peoples and to spread the goal of the Nation based on special ideology. So literature education usually was ideological and utopiaoriented tendency. Then what will be happen in the feature if we can't get over this divided situation of south and north? We encourage student to prepare unification-oriented mind for our literature education of 21th century. In that case, literature education is useful for that through the imagined community of Korea.

남북관계 있어서의 스포츠의 역할

최승룡 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.1

We know that it is necessary to promote exchanges in various fields, including politics, economics and etc., between South and North Korea for the unification of Korean peninsula. But we also know that some difficulties are in the way of those exchanges, because South and North Korea have been separated since 1945 and it has made serious heterogeneities in two societies. As a precondition for the unification of Korean peninsula, therefore, South and North Korea need to recover the homogeneities as a race and expand the exchanges in the area of sports field. The exchanges of sports which join bodies to bodies and link hearts with hearts, possibly develop a new partnership based on mutual understanding and trust, and possibly recover the homogeneities as a race. In order to activate the exchanges of sports between South and North Korea, it is necessary for us to offer legal and institutional supports with the agreements for ruling sports games and operating sports funds. And also, we need to promote the various, continuous, and step-by-step exchanges of sports. We need to have the community senses as a race to unify South and North Korea. Activating the exchanges of sports will make a great contribution towards this without any political accounts. Here, I suggest some principles in the exchanges of sports. Firstly, not to speak of building a unified team, constructing a unified cheering party, and having mutual visiting games, we should make efforts to foster and support the industries in relation to sports, and exchange and share the information in relation to sports. Also we need to expand the opportunities for a variety of interpersonal exchanges between South and North Korea. Secondly, needless to say promote government-level or athletic group-level cooperation, private-level cooperation need to be also activated. The efforts for the spontaneous and autonomous cooperation between two societies are positively encouraged. Thirdly, we should promote and accomplish regularly the mutual visiting of sports games like taekwondo or Korean wrestling, which have strong traditional factors in South and North Korea, in order to cultivate the community senses as a race. Finally, we need to standardize the differences in athletic terms and athletic rules between South and North Korea.

R134a 냉동장치의 과열도 변화에 의한 성능 특성 연구

김성배,하옥남 朝鮮大學校 機械技術硏究所 2007 機械技術硏究 Vol.10 No.1

Since the use of CFCs and HCFCs refrigerants are to be restricted due to the depletion of ozone layer, this experiment applies the R134a gas to study the performance characteristic from the superheat control for improving the energy efficiency. The experiments are carried out for the condensing pressure of refrigeration system from 1.5MPa to 1.6MPa by 0.05 MPa and for superheat temperature from O℃ to 5℃ by 1℃ at each condensing pressure. As a result of experiment, when the superheat temperature is 1℃ at each condensing pressure, the refrigeration system has the highest performance.

컴퓨터와 사용자와의 상호작용을 통한 영상 특성 추출함수의 최적화

김승현,서재현 인제대학교 1997 仁濟論叢 Vol.13 No.1

영상처리에서 가장 주요한 주제의 하나는 어떻게 "처리하고자 하는 대상의 특징값"을 분리해낼 것인가에 대한 것이다. 또한 이러한 특성값 추출 처리의 전제로서 경험과 지식이 풍부한 전문가가 영상의 분석을 위해 분리해내는 경우와 비슷한 정도의 결과를 얻어 낼 수 있느냐가 실용화의 관건이 될 것이다. 그러나 이러한 처리를 하는 데에 가장 큰 문제점은 비교사적 방법에서는 컴퓨터는 [처리할 영상에 대한 지식]을 가지고 있지 않으며, 프로그램의 작성자가 처리할 영상의 샘플들을 미리 입수해 통계적으로 처리하고, 이에 의해 만든 특성 추출 함수에 의존하여 기계적으로 영상의 특성 값을 분리했기 때문에 첫째, 다른 종류의 영상 데이터에는 사용이 불가능하며, 둘째, 영상 데이터의 특성이 변할 경우 특성 추출함수를 새로 만들기 위해 많은 노력과 시간이 필요하며, 셋째, 최종 사용자가 쉽게 새로운 분야에 적용시키지 못하는 단점이 있으며, 사용자가 샘플 영상을 미리 넣어주는 방법을 통한 교사적 방법을 이용할 경우에는 첫째, 사용자가 잘 정의된 샘플 데이터와 결과 값을 미리 준비해야 하며, 둘째, 학습을 위한 시간이 너무 오래 걸리며, 셋째, 결과가 만족스럽지 못할 경우에는 몇 번이라도 재교육을 필요로 하는 어려움이 있었다. 본 논문에서는 이러한 문제점을 몇 가지 영상 샘플(training set)과 현재까지 가장 널리 사용되는 주요한 특성 추출 함수, 그리고 실제 사용자와의 상호작용에 의해 지식을 축적해 나감으로서 위의 문제점을 해결하고 최적화된 특성 추출 함수를 생성함으로서 보다 좋은 결과를 얻어내기 위한 방법을 제시한다. One of most important topic in image processing is feature extract and classification But in its process, the significant problems are that, (1) a way without teachership: first, if a image is changed. it can't be used next. second, to make a new feature extract function, it make a new feature extract function, it requires many times and much effort. second, to make a new feature extract function, it requires many times and much effort. finally, it is hard for end user to apply to a different field. (2) teachership way: first, a user have to prepare sample data and result values in each time. second, it spends many times on learning. finally, if the result of study is not content, the user have to receive retraining. So, in this paper we suggest a solution of the problems.

수질개선을 위한 Fixation과 Air Jet System 개발

권성환,정광영 公州大學校 工學硏究院 生産技術硏究所 2003 論文集 Vol.11 No.-

This paper presents development of a fixation and an air jet system for water quality improvement. The fixation is a dredging machine that scoops or suctions sediment from the bottom of waterways. The air jet system is a system to blow air and water in the water for water quality improvement. A fixation and an air jet system are designed and their proto type models are made for water quality improvement. Overall structures of the two are introduced.

기립자세에서 발위치가 무릎 폄근의 등척성수축 근전도 활성도에 미치는 영향

김성중,권오윤,조상현,황지혜 한국전문물리치료학회 2001 한국전문물리치료학회지 Vol.8 No.2

This study was designed to identify the effects of foot position on electromyographic (EMG) activity of the quadriceps femoris during maximum voluntary contraction (MVC) in standing. Twenty young adults who had not experienced any knee injuries were recruited. Their Q-angles were within a normal range. They were asked to stand in five different foot positions (40˚externally rotated, 30˚ internally rotated, neutral, 20˚ plantarflexed, and 10˚dorsiflexed foot position). The EMG activities of the vastus lateralis (VL), rectum femoris (RF), and vastus medialis oblique (VMO) were recorded in standing by surface electrodes and normalized by MVC EMG values derived from manual muscle test. The normalized EMG activity levels (%MVC EMG) of muscles in the five foot positions were compared using repeated measures ANOVA. The EMG activity levels of the VL, RF, and VMO were the highest when foot was externally rotated. The EMG activity levels of the VL and RF were significantly different among the foot positions (p<.05). However, EMG activity levels of the VL, RF, VMO, and VMO/VL ratio did not show significant differences in each foot position (p> .05). The results suggest that the quadriceps femoris may be effectively activated by performing MVC a: an externally rotated foot position. Therefore, the externally rotated foot position can be considered as an effective foot position for quadriceps femoris strengthening exercise. Further studies are needed to identify whether there are differences in the effects of foot position on muscle strength after MVC exercise of quadriceps femoris in standing.

상피성 임파부종 환자의 치료 : 증례보고 Case Report

김성중 한국전문물리치료학회 1999 한국전문물리치료학회지 Vol.6 No.3

솔리드 모델러 기반의 스태빌라이져 링크 자동 3차원 모델링 시스템

정승용,강재관 慶南大學校 附設 工業技術硏究所 2003 硏究論文集 Vol.21 No.1

자동차의 잦은 설계 변경에 따라 자동차 부품은 지속적으로 새로운 부품이 개발된다. 본 논문에서는 상용 솔리드 모델러의 파라메트릭 설계 기능과 API기능을 이용하여 자동차 현가 장치에 사용되는 부품인 스태빌라이져 링크 부품의 설계 자동화 시스템 개발 사례를 소개한다. 스태빌라이져 링크의 종류 및 구성 부품 분석과 파라메트릭 설계를 이용한 단품 모델링, API를 이용한 조립품 자동 설계, 그리고 다양한 종류의 2차원 도면 자동 생성 방법 등이 기술된다. In this paper, an automated design system for stabilizer link parts based on commercial 3-D solid modeler is developed. Parametric modeling and API (Application Programming Interface) functions provided by commercial 3-D solid modeler are engaged to develope the system which consists of 3-D part modeling, automatic assembling of the parts, and automated generation of 2-D drafting. Commercial solid modeler. UG and Visual C++ are used to implement the automated systems.

釜山地方의 堂祭攷

金承璨 東亞大學校 文理科大學 附屬 韓國民俗文化硏究所 1978 民俗文化 Vol.1 No.1

To tell briefly the conclusions made from the survey of Dangsan-rite of Busan district; 1) The order of the Dangsan-rite; mountain-god rite→Golmaegi dagsan rite→Golmaegi rite. 2) The rite of Dangsan in usually held in the midnight of the 15th day of January. 3) The Dangsan-rite if may be one of the fertlity rites to supplicate tile village's safely and a good harvest of the year.