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張星雲 忠州大學校 1998 한국교통대학교 논문집 Vol.30 No.1
The temperature drop by wind speed appears from the convection heat transfer. Wind speed(car speed) is from 30km/hr to 120km/hr. The material of temperature drop are steel plate and roof of the car. The thermometer is surface temperature measurement TM-200. Measuring time of temperature drop is six times each 30sec. from 0sec to 180 sec. The results wer as follow. 1. All most temperature drop of the thin steel plate is formed with in 60sec. 2. Thin paint of the steel plate make large resistance in convection heat transfer. 3. Temperature drop by convection heat transfer is not low of the ambient temprature. 4. Heat loss by convection heat transfer is 60% with in 60sec.
張星雲 충주대학교 1990 한국교통대학교 논문집 Vol.24 No.-
In this theoritical study of power decrease in a refrigerator, the studies are three parts in a rifrigerator. The first study is about compressor. The second study is about evapourator. The third study is about condensor. The results are as follows. For the power decrease in a rifrigerator 1. In a refrigerator should be used multi-stage compressor for power decrease. 2. Evapourator should be made of Cu or Al. They get rid of frost and ice in a evapourator 3. enough air flow should be studied in the condensor
張星雲 忠州大學校 1984 한국교통대학교 논문집 Vol.17 No.2
A little hot water generator is used for room heating in winter. The little hot water generator has some fault to piping and has a lot of heat loss. In this study, the fault to piping was found out, so we can decrease the heat loss. The result were as follows 1. water service tank bust be jointed to the water inlet side at a little hot water generator. 2. water value and air pin must be jointed at a room heating coil 3. For self-circulation, heating coil must be piped to a plane and water inlet side is a little high than to the water outlet side in a room heating coil.
장성운,전청덕 忠州大學校 2003 한국교통대학교 논문집 Vol.38 No.4
An experiment was carried out to investigate the characteristics of the evaporation heat transfer and pressure drop for refrigerant R407C in a fin-and-tube heat exchanger of commercial air-conditioning unit. Test was conducted at the conditions of inlet refrigerant evaporation temperature 7℃, inlet air relative humidity of 40~50%, and refrigerant mass flux varying from 150 to 250kg/m2s. The evaporation temperature of the refrigerant at the test section inlet were maintained at 7℃. Evaporation performance of R407C was 4.6~11.7%, 2.5~15% lower than compared to that of R22 for relative humidity 40% and 50% respectively and this difference was increased as the refrigerant mass flux increases. The experimental data were also useful in analyzing the effects of the temperature glide and length of two phase region for ternary non-azeotropic refrigerant mixture R407C, which is one of the potential candidates for the replacement of pure refrigerant R22.
장성운,박달근 忠州大學校 2004 한국교통대학교 논문집 Vol.39 No.1
From the experimental study on milling cutting work of Mild steel, the characteristics such as spindle speed and vise jaw length for the maximum peak to valley roughness height, third point height, ten-point hight. Experiments is roughness for sampling length determine of measuring length is vise jaw edge 10mm from vise edge to of cutting feed 170mm/min and spindle speed 500, 800, 1100, 1400rpm. vise jaw length 10, 20, 30, 40mm for vise jaw 100mm, cutting depth constant 1mm. Maximum peak to valley roughness height is spindle speed and vise jaw length with most suitable cutting condition at vise jaw length 10% for cutting force decreased to maximum peak to valley roughness height minimum. Third point height is most suitable cutting condition at 800rpm third point height to minimum decreased at spindle speed decreased cutting force increased. Ten-point hight roughness peaks are spindle speed with vise jaw length of most suitable cutting condition at vise jaw length decreased and spindle speed increased.
안태환,최규하,장성운 충주대학교 1983 한국교통대학교 논문집 Vol.16 No.1
The technical civilization developing every day and the information subdividing further and further lead to fast social change, and this character of raped social change emphasizes the necessity of lifelong education with revaluation of traditional school education. That is, modern mankind must steadily learn new knowledges and techniques to cope with the different challenges caused by rapid social change and explosive know ledge flood. The extensive and rapid change of industrial society and marvelous development of industry in our country bring about periodical alteration and reformation in the field of Mechanical education, which requires the improvement of professional education level without delay in accordance with a sudden increase of competent technicians by advanced industrial techniques in our society. Results of this study. 1) We established a new curiculum to train the technicians required in industrial bodies which will be suited directly to industrial bodies. 2) The new curriculum is not a curriculum which gives the first consideration to professors, but a curriculum which corresponds to the objects of junior college education. 3) We developed the very korean curriculum fitted to korean situation, but a direct introduction or imitation of foreign curricula. 4) We developed the curriculum given the first consideration to practice to train the technicians, and it is not providing for the examination of the second-rate engineers. 5) We studied the profession course curriculum to train the technicians beyond the for reaching curriculum give the first consideration to be admitted into 4 years college. 6) We developed a curriculum which a connected theory with practice. 7) We developed the curriculum to educate the professional techniques by analyzing duties in each course unit. 8) We put emphasis on concentrating upon their dutics in teaching the students with pride by improving the problem of junior college professors who are depressed. 9) We developed a curriculum which is interesting and adaptable with in the short period of time. 10) We studied the way of improving the problems of cooperation between college and industry and administrative structure. 11) We developed a course curriculum adaptable to industrial bodies by education suited to students' character and competnce. 12) We developed new teaching method which enables us to educate coming to international level. 13) We modeled a syllabus fitting to now teaching method. 14) We made a proper practice model and a job sheet, by which we cstablished a curriculum linking college and industrial body. 15) We developed a new evaluation method which enable us to rate individual student's achievement rightly.
絞縮熱量計에서 蒸氣의 膺力과 오리파스의 크기에 關한 考察
張星雲 忠州大學校 1980 한국교통대학교 논문집 Vol.13 No.2
On this experimental, motive steam enthalpy was measured by throtting calorimeter At the experimental, I tried to find more suitable oriffice size at motive pressure of boiler and throttling calorimeter. Five pieces of oriffice was made for the experimenter. Each size of oriffice were 2.4mm, 3mm, 3.6mm, 4mm, 5mm, Bioler working pressure was 0-15kg/㎠. Boiler evaporating rate was 150kg/hr. By the resulf of experimental, large of small size(5mm of 2.4-3mm) of oriffice were not suitable for measuring steam enthalpy. Oriffice size 4mm is best suitable size for measuring motive steam enthalpy.
張星雲 忠州大學校 1985 한국교통대학교 논문집 Vol.18 No.2
In winter, the heat loss of a room was appeared through room walls and windows. In this study, for checking the heat loss through window, Small model room was made of vinyl film and insulation. The small model room size is W 260㎜, H 235㎜, L320㎜. The space at the double windows were 5㎜, 10㎜, 15㎜, 20㎜. The small model room was put in a refrigerator. The temperature inside refrigeration was 4℃ Checking temperature down were every 10 minute and six times. The result were as follows. 1. The best space to double vinyl film window for the least heat loss is 10㎜. 2. When the space was wide than 10㎜, convection of the air was very fast and much heat transfer can be from in side window to out side window. 3. When the space was narrow then 10㎜, the heat conduction of the air element was possible and heat loss was increased. 4. In this time, the space of the pair glass needs more wide and the space of the double window needs more narrow. then we can decreas the heat loss.