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吸入 空氣의 濕度가 Diesel cycle의 性能에 미치는 影響에 關한 理論的 考察
장성운 忠州大學校 2007 한국교통대학교 논문집 Vol.42 No.-
For calculating theoretical thermal efficiency of Diesel cycle in internal combustion engine, Theoretical thermal efficiency is decided by compression ratio. Compression ratio of internal combustion engine is calculated by stroke volume and clearance volume. The air of stroke volume is constant to the engine mechanism. Air temperature of clearance volume increases adiabatic compression. The moisture in intake air is evaporating by the temperature of adiabatic compression. Moisture evaporating is increased volume in the clearance volume after adiabatic compression. Clearance volume is the intake air and the steam of moisture evaporating. The result, compression rate is increased and thermal efficiency is changed. For calculating, Absolute humidity of intake air increase 0, 5, 10, 15, 20, 25, 30.% The result were as follows. 1, Increase the absolute humidity of intake air in Diesel cycle, moisture is changed to super heated steam by evaporating and increased the volume in the clearance volume and changed compressing rate after adiabatic compression. 2, Pressure increase after adiabatic compression improves the power of engine. 3, The high compressing rate increases thermal efficiency in Diesel cycle. 4, If the moisture increasing mechanism is applied to the intake air, engine power and thermal efficiency is increased and engine is effected a little big size.
장성운 忠州大學校 2009 한국교통대학교 논문집 Vol.44 No.-
All the world war of the energy. Energy is the resources of national. All the national try to secure of energy. Fossil fuels is drained gradually in the world. But, the world population use energy for comfortable life. The style of energy use is heating, electric generation, vehicle etc. The theoretical efficiency of heat engine is about 45%, and actual efficiency is about 26%. The energy loss of 55% give off to the air and the rest is mechanical energy loss. The heat energy give off to the air is the chief criminal of earth warm. In the steam power plant, The heat energy give off to the air is using for heating warm water. Warm water is supply to home. But heat engine of car, The heat energy give off to the air can not use. The reason, heat engine of car is moving In this study, For electric generating use thermo-electric element. Thermo-electric element is generating the electric from the heat energy give off to the air in car engine. The results are as follows. 1. using thermo-electric element, electric generating is possible from the heat energy give off to the air in car engine exhaust gas. 2. In the experimental equipment, A piece of thermo-electric element is generating of electric 0.2W-3.2W to the temperature range 50℃-290℃. 3. 200 pieces thermo-electric element can apply to the car exhaust gas muffler and can generating of electric 160W-300W. 4. Recharge the generating electric to the battery of car, The generator power of car is decrease about 1/3 and increase car engine power.
李亨元,金相鶴 順天大學校 1983 論文集 Vol.2 No.1
For the children as one of the most effective exercises regardless of season, rope-skipping which can make them use the two-thirds of bodily muscles will be a production of wisdom in the children's sports. And furthermore it is no doubt being used regularly to the various kind of players who need strong body as well as general citizens who try to look for a good health in daily life. Since it as a all-weather exercise has special characteristics that its exercise is so econmic and easy irrespective of time and place to learn that all people easily train. Sometimes this rope-skipping is misunderstood as a forced or formal exercise, and even it they recognize its necessity but they are less interested in it without the voluntary and positive will. Most of them can be largely found to be complicated in their private life or to be feeble-minded child in the exercise apititude. As the first aim of physical exercises in the suggestion of teaching guidance is to strengthen the body strength, the fist step of activity to carry out the aim is to teach the practical direction of attitude and behavior. So the active political measure from the government from the purporse of accomplishing the aimis badly needed nowin various class of schools. Schools should not cling to the only rope-skipping itself but use it with diverse teaching methods with the accordance with interesting and effective exercise motives. The non-stop activities of this exercise according to voluntary and creative training methods will surely result in a good outcome which this thesis intends.
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.