f-chart 設計法에 의한 太陽熱 暖房裝置의 設計

柳盛淵 충남대학교 공업교육연구소 1982 論文集 Vol.5 No.1

The f-chart design method is presented for solar space and water heating systems. The information gained from many simulations of solar heating systems has been used to develop this f-chart. Actual hourly weather data collected in Yuseong, Korea, from 1971 to 1980 have been utilized in these simulations. The system performance estimates obtained from the f-chart are in close agreement with the results of the simulations.

水平四角管 周圍에서의 亂流熱傳達(Ⅱ)

柳盛淵 충남대학교 공업교육연구소 1986 論文集 Vol.9 No.1

A procedure for numerical analysis of turbulent convective heat transfer around a horizontal rectangular cylinder is presented. The k-ε turbulent model is used and the staggered grid system is introduced for the velocity components. Finite difference equations are derived from elliptic partial differential equations using hybrid scheme. TDMA and line-by-line SIMPLE algorithms are used to solve finite difference equations. The variation of mean velocity, turbulent kinetic energy, dissipation rate of turbulent kinetic energy, and temperature behind the cylinder are presented. The heat transfer coefficient from a rectangular cylinder in cross flow is represented by the relation Nu = 0.0282 Re^0.766 Pr^1/3 for 10^³〈 Re〈 10^5

水平四角管 周圍에서의 亂流熱傳達(Ⅰ)

柳盛淵,姜理錫 충남대학교 공업교육연구소 1984 論文集 Vol.7 No.2

A procedure for numerical analysis of turbulent convective heat transfer around a horizontal rectangular cylinder is presented. k-ε turbulent model is used, and staggered grid system is introduced for the volocity components. Finite difference equations are derived from elliptic partial differential equations using hybrid scheme. TDMA and SIMPLE algorithm are used to solve finite difference equations. Numerical example is shown for the flow through a sudden enlargement to examine turbulent model and numerical scheme. In a work following this paper, whole numerical and experimental results will be shown.

平板型 集熱器를 使用한 太陽熱 暖房裝置의 Optimization

柳盛淵 충남대학교 공업교육연구소 1981 論文集 Vol.4 No.2

This paper describes a procedure for assessing the economic feasibility of a solar heating system in terms of the life cycle savings of a solar heating system over a conventional heating system. Using the generalized life cycle savings equation, a method is developed for determining the optimal collector size of a solar heating system in accordance with the criterion of maximizing the life cycle savings. Information gained from a simulation of a solar heating system is used to establish the relationship between system performance and the system design variables. Actual hourly weather data collected in Yu Seong, Korea, from 1971 to 1980 have been utilized in this simulation. The results of optimization are presented in tabular and graphical forms. Numerical examples are presented for a solar house with a floor space of 30 pyeong(99㎡) designed by Ko-Solar Inc. These examples show that solar heating systems may now be economically competitive with conventional heating systems under certain economic conditions.

平板型 集熱器를 使用한 太陽熱 暖房裝置의 Simulation

柳盛淵 충남대학교 공업교육연구소 1980 論文集 Vol.3 No.2

A simulation program capable of estimating long-term thermal performance of a solar space and water heating system was developed. The system comprised of a flat plate solar collector, heat exchanger, storage tank filled with water, auxiliary fuel fired heater, and a house structure. This simulation was based on hourly weather data from September 1979 to April 1980 in Yu Seong, Korea. Insolation energy, collector useful energy gain, space and water heating loads, and the fraction of loads supplied by solar energy were obtained and compared for four collector areas. The information gained from this simulation can be used design a economical Solar heating system.

습기제거시스템의 성능에 관한 연구

유성연,정민호,홍정표,심국진,김광영 忠南大學校 産業技術硏究所 1997 산업기술연구논문집 Vol.12 No.2

The performance of moisture removal system is investigated analytically and experimentally. The program for the moist air calculation and for the condensing tube design are developed to examine the factors which affect moisture removal rate. Experimental apparatus comprises condensing tube, cooling system, vacuum pump, measurement and control devices. Thermoelectric cooling system and vapor compression refrigeration system are used to cool the air, and the performance of two systems are compared each other. Thermoelectric cooling system is compact and free from noise and vibration, but cooling rate of it is relatively slow compared to that of vapor compression refrigeration system. Air velocity, indoor temperature and humidity, temperature of coolant, size and material of condensing tube are found to affect the performance of moisture removal.

유도경기 지도자의 리더십 행동유형과 경기력과의 효율 분석

하형주,유성연 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.3

The purpose of this study is to enhance leadership of Judo Leaders by adopting double sided approach to Judo players in high schools nation-wide, applying dynamic and whole "Competing values leadership scale for sport" theory, identifying leadership type of Judo leaders by gender and by team level through in depth study and providing basic materials for effective teaching according to the circumstances of the specific team The subjects were male and female Judo players in high schools nation-side who were registered in Korea Judo Association and had participated more than 7 national contests between march 2001 till December 2002, They were 420 in 18 teams (10 teams for male students and 8 teams for female students). The tool used was "Competing Values Leadership Scale for Sport" developed by Hyeong-ju Ha in 1995. ANOVA method was used to verify differences between Judo teams and leadership type of the leaders. Post analysis was done using Newman Keuls and all the materials were coded on MS-EXCEL, For statistics analysis, SPSS/PC Version 10.0 was used under the condition of p<0.05. Additionally standard point of the role of each leader (Z) was calculated for relative evaluation and leader profile structure was achieved through MS-Excel. The results of the study through material analysis were as follows; 1) Intermediary representation role was high (p<.05) in male teams and analytical management role (p<.05) end spiritual support role (p<.01) were high in female teams. 2) Male team leaders should enforce analytical management role and female team leaders should enforce creative study role and intermediary representation role in their leadership profile.

材料試驗의 效果的인 指導를 위한 敎授學習敎材의 開發

邕章祐,柳盛淵,姜理錫 충남대학교 공업교육연구소 1983 論文集 Vol.6 No.2(A)

Instructional materials were developed for effective teaching of materials testing and to promote the maximum use of the newly acquired experimental equipments. We have developed experimental manual and slide films. These materials comprise of tension test, compression test, bending test, hardness test, impact test, fatigue test, wear test and magnetic particle inspection. This study will contribute to teaching and laboratory practice of materials testing.

한국 성인을 대상으로 한 전산화 Standard Progressive Matrices의 표준화 예비연구

홍경수,이민수,오병훈,하규섭,유한익,이창욱,연병길,김성윤,신민섭,김재진,권준수 大韓神經精神醫學會 1999 신경정신의학 Vol.38 No.5

연구목적 : 전산화 Standard Progressive Matrices(SPM) 검사의 한국인 성인 표준자료를 확립함으로써, 간이로 지능을 평가하는 경우에도 보다 정확하게 지능지수를 추정하기 위해서 본 연구를 수행하였다. 방 법 : 18세 이상의 남녀 정상인 자원자 353명을 대상으로 전산화 SPM 검사를 시행하고, 백분율 및 표준점수(T-점수)를 기준으로 하여 표준화 자료를 작성하였다. 전체 대상군을 성별, 연령별로 구분한 후 평균과·분포가 유사한 집단은 군을 합치는 방법을 사용하였다. 한국인 표준자료에 근거하여 추정한 SPM 지능지수와 외국인 표준자료에 근거하여 추정한 SPM 지능지수를 각각 KWAIS 지능지수와 비교함으로써 타당도를 검증하였다. 결 과 : 18∼30세, 31∼40세, 41∼50세, 51세 이상의 연령군으로 구분된 한국 정상 성인의 SPM 표준화 자료를 산출하였다. 본 연구 결과에 의한 표준화 자료를 적용하여 지능지수를 추정하는 것이 현재 사용하고 있는 외국인의 표준화 자료를 이용하는 것보다 KWAIS 지능지수에 더욱 근접한 결과를 보였다. 결 론 : 18세에서 50세까지의 한국인 남녀에게는 간이지능평가도구로서 전산화 SPM 검사의 한국인 표준화 자료를 유용하고 타당하게 적용할 수 있음을 확인하였다. Objectives : We conducted this study to provide standardized data of the computerized Standard Progressive Matrices(SPM) test in Korean adults. Methods : The computerized SPM test was administered to 353 healthy volunteers aged 18 years over. We provided the standardized data(percentile and standardized T-scores) for the groups with similar mean and distribution of SPM scores, which was originally divided by age and sex. The validity of the new standardized data was tested by comparing IQs estimated by SPM and K-WAIS. Results : The standardized SPM data were provided for four age groups : 18 to 30 years, 31 to 40 years, 41 to 50 years, 51 years and over. IQ estimated by this standardized data tends to be closer to IQ by K-WAIS than the IQ estimated by foreign normative data. Conclusion : The standardized data of the computerized SPM were proven to be a useful and valid tool for measuring IQ briefly, compared with the conventional way of measuring IQ.

study on energy saving of cooling/reheating system using compact heat exchanger

Seong-Yeon Yoo,Jin-Hyuck Kim,Myoung-Seok Jie 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.4

When circulated air passes through the cooling coil in an air-conditioning system, the air is over-cooled to eliminate the moisture and decrease the temperature. The cooled air is then reheated to recover the temperature. The purpose of the present study was to evaluate the performance of a cooling/reheating system with regard to both cooling and reheating energy savings affected by exchanging heat between the cooled air and the reheated air with a compact heat exchanger. The thermal and dehumidification behaviors of the system were evaluated experimentally and then compared with simulation data. The results show that the energy saving rate was as high as 50% under the present experimental conditions and was affected by the face velocity of the heat exchanger, the inlet temperature, the inlet humidity ratio, and the effectiveness of heat exchanger. Furthermore, the experimental data were found to be in fairly good agreement with the simulation data.