물 분사를 이용한 프로펠러 날개 끝 보오텍스 캐비테이션 제어

이창섭(Chang-Sup Lee),한재문(Jae-Moon Han),김진학(Jin-Hak Kim),안병권(Byoung-Kwon Ahn) 대한조선학회 2010 大韓造船學會 論文集 Vol.47 No.6

대학생들의 여가활동 실태와 여가인지에 관한 연구

김준희(Jun Hee Kim),한재문(Jae Moon Han),이예승(Ye Seung Lee) 한국여가레크리에이션학회 2004 한국여가레크리에이션학회지 Vol.27 No.-

The purpose of this study is to investigate and research the Relationship Between Recognition of Leisure and Reality of Leisure Activities among male and female university students who live in Yong-In. For achieving this purpose of the study, the questionnaires were used in order to collect data in this study. The 820 subjects were selected by the stratified cluster random sampling method from the participants, a population in this study, who were male and female students attending some universities located in Yong-In. In this study, The controlled antecedent is personal characteristics, the independent variable is type of leisure activities and the dependent variable is recognition of leisure. There are results of hypothesis testing with this method and procedure, from the analysis of this study, the following conclusions were obtained: First, there is the significant difference in type of participating leisure activities related to personal characteristics. Male students have more frequency in participating sports as a leisure. Female students have more frequency in participating viewing and appreciation as a leisure. In the case of the grade in school, males in all grades have more frequency in part of sports and females in all grades have more frequency in the participation of viewing and appreciation. In the type of leisure activities according to major, pocket money and religion, there are more frequency in participating a kinds of sports as a leisure than other parts. Second, there are results of Recognition of Leisure in types of participating leisure activities. In case of the Confidence while enjoying leisure activities, males have more confidence while enjoying a hobby for a leisure. Females have more confidence while enjoying a sports for leisure. Regarding as Controling while participating leisure activities, males enjoying leisure activities for a hobby and culture and females enjoying sports as a leisure activity have more controlled than other parts of leisure activities. In the case of desire while participating leisure activities, male students prefer leisure for a hobby and culture to the others, which is the meaningful results. Female students prefer participating leisure activities as a sports to the others. Finally, there are results of Infatuation according to participating leisure activities. Males have more infatuation in the part of sightseeing pleasure than the other type of leisure. Females have more infatuation in the part of leisure as a hobby and for a culture than the other type of leisure.

선미 후류에서 작동하는 혼타의 압력분포에 관한 연구

공도성(Do-Sung Kong),한재문(Jae-Moon Han),류재문(Jae-Moon Lew) 대한조선학회 2002 大韓造船學會 論文集 Vol.39 No.2

CASE 도구를 이용한 ATC 차상 소프트웨어의 UML 모델링

양찬석(Yang Chan Seok),임재식(Lim Jae Shik),한재문(Han Jae Moon),김치조(Kim Chi Jo),조용기(Cho Yong Gi) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-

ATC on-board equipment require realtime embedded software with high level of safety and reliability. To satisfy these requirements, many techniques are applied to the development of software during the lifecycle. In case of software modeling, object-oriented methodology is widening its niche replacing traditional structured methodology and modeling in UML using a CASE tool is a growing trend. In this paper, we modeled ATC on-board software in UML using Rhapsody, which is a modeling tool for realtime embedded software. We modeled the behavior of ATC on-board equipment based on state machine diagram and validated the model using the animation feature provided in the tool. According to our study, the CASE tool based on UML showed high level of applicability in modeling and verifying the software with complex behavioral characteristics.

한국 고속 철도에서의 열차 검지 개선에 관한 연구

엄정규(Um Jung Kyou),조용기(Cho Yong Gi),김치조(Kim Chi Jo),한재문(Han Jae Moon) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-

In this paper, an AF track circuit receiver which is using DSP technique is designed and tested in the Lab. and field. The receiver detects of a train and operates the track relay to inform this occupation to ground equipments. Basic algorithms, digital filters, FM demodulation and DFT are simulated by computer and applied to the receiver. The test of receiver is processed under the LAB condition and the field. Results of the test shows that the response time is less than 500ms. This paper presents that the receiver has good maintenance and less variation of device characteristics and is applicable to the Korea High Speed Line.

임지 내 고사한 산림연료의 수분함량과 기상인자와의 관계 분석

채희문 ( Hee Mun Chae ),조융희 ( Yung Hee Cho ),김준성 ( Jun Sung Kim ),서주원 ( Ju Won Seo ),한재문 ( Jae Moon Han ) 한국임학회 2014 산림과학 공동학술대회 논문집 Vol.2014 No.-

임지 내 고사한 산림연료의 수분함량은 산불의 확산 및 발생에 매우 밀접한 연관이 있다. 임지 내 기상인자의 변화는 고사한 산림연료의 수분함량을 결정하는 요인들 중 중요하게 작용한다. 본연구는 기상인자가 고사한 산림연료의 수분함량에 미치는 영향을 분석하고, 산불 예보시스템의 산불기후지수에 적용가능성을 검토하고자 한다. 임지 내 기상인자 분석을 위하여 본 연구는 봄철 및 가을 산불 조심기간동안 소형기상기록장치(HOBO data logger)를 임지 내에 설치하여 매일 1시간간격으로 온도, 상대습도, 조도, 토양온도를 측정하였다. 고사한 산림연료의 수분 함량은 봄철 및 가을철산불 조심기간동안 수목 5종(소나무, 잣나무, 밤나무, 떡갈나무, 벚나무)의 낙엽을 채취하여 건조중량을 비교 분석 하였다. 또한 임지에서 측정된 기상인자와 고사한 잎의 건조 중량간의 상관관계를 분석하여 임지에서 산림연료의 수분함량에 가장 영향을 미치는 인자를 파악하고자 하였다. 봄철 및 가을철 산불조심기간에 기상청 기상자료와 임지에서의 기상인자의 분석결과 임지와 기상청의 기상인자 온도는 봄철 10.5℃ 가을철 12.9℃ 임지는 봄철 12.07℃ 가을철 12.6℃ 로 나타났다. 특히 강우후의 고사한 산림연료의 수분 함량은 강우량의 차이에 따라서 강우량이 적은 경우 2일 이내에 비오기전 수분함량으로 돌아오는 경향을 보이고 있으며, 강우량이 많은 경우는 3일 정도 소요되는 것으로 분석되었다. The dead fuel moisture contents in the forest stands are very closely related to forest fire spread and ignition. The change of weather factors in forest stands is important to dead fuel moisture contents. This was conducted to provide of basic data for korea forest fire weather index system through analysis on dead forest fuel moisture contents and weather factors in forest stands. For analysis on meteorological data, we were installed to HOBO data logger on the study area(in forest stands), Meteorological parameters (temperature(℃ ), relative humidity(%), light intensity(Lux), soil temperature(℃)) were measured with 1 hour interval on the every day during spring and fall fire danger season. Dry weighting of dead leaves of five tree(pine, white pine, beech, oak, cherry) for analysis on moisture contents during spring to fall fire danger seasons at study area was measured. As compare of weather factors of forest land and weather service station of Chuncheon. In the spring and fall fire danger season the temperature was 12.07℃, 12.6℃ in forest stands, 10.5℃, 12.9℃ in the weather service station, respectively. The change of dead forest fuel moisture contents after rain fall was similar to the previous dead forest fuel moisture contents after 2 or 3 days.

옥내/외 압력차에 따른 실내라돈(^222Rn) 유입 예측 모델에 관한 연구

이원근,한재문 경희대학교 산학협력기술연구원 2001 산학협력기술연구논문집 Vol.7 No.-

Indoor radon is produced in primarily by pressure differentials from indoor/sub-slab and indoor/outdoor environment. The differential pressure between two separated regions was changed theoretically into differential temperature by using the ideal gas law. The difference between model prediction and measurements can be characterized by Mean Square Error(MSE) method. The MSE value of 0.11 Pa shows good agreement between predicted pressure differentials and measured pressure differentials.

실내 라돈(^(222)Rn) 유입 예측 모델을 위한 이론적 고찰

이원근,한재문 경희대학교 자연과학종합연구원 2001 자연과학논문집 Vol.7 No.-

라돈(^(222)Rn)이 실내로 유입되는 중요한 거동중의 하나로 실내·외간 압력차이와 실내와 바닥하부의 압력차이로 인한 가옥의 기초하부의 라돈이 실내로 침투된다고 보고 있다. 그러나 그 압력차이가 0 Pascal(Pa)에서 5Pa정도로 미미하여 실제로 측정하기에는 높은 정밀도가 요구되는 압력차 측정기기가 필요하다. 따라서 측정하기 용이한 온도를 사용하기 위하여 실내·외의 압력변수를 이상기체상태 방정식을 이용하여 온도로 전화하였다. 여기서 실내와 실외 그리고 바닥하부의 공기는 이상기체로 가정하였다. 온도에서 유도된 실내와 실외의 압력차이와 실내와 바닥하부의 압력차이 형성에 대하여 이론적으로 고찰하여 보았다. Indoor radon is produced in primarily by pressure differentials from indoor/sub-slab and indoor/out-door environment. But high-precision differential pressure test device is needed to measure this very low pressure differentials(0Pa∼5Pa). To use the temperature instead of the pressure variable in the differential pressure dependent radon entry model indoor sub-slab and outdoor air are assumed as an ideal gas. Finally, differential pressure variable was changed theoretically into differential temperature variable by using the ideal gas law.