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부하 및 점화시기가 내연기관의 피스톤 온도분포에 미치는 영향
유갑종,이충원,엄용균 경북대학교 산업기술연구소 1989 産業技術硏究誌 Vol.17 No.-
An experimental study was carried out concerning the effect of load and spark timming on the temperature distribution of pistion of I.C engine. The temperature distribution of piston was measured by L-link system method as following conditions; The revolution of engine operated from 1500 R.P.M to 3500 R.P.M with increasing the load, making a knocking each revolution and varied ignition time. The result of experiment was as follows; The piston temperature increase directly proportional to the engine speed and the load on the surface and the inner of piston crown, the temperature in the region of inlet valve is higher than that of exhaust valve. The temperature distribution at the surface of piston crown is not symmetrical type, but is the higher at the location of spark plug. The temperature of piston skirt decreases along to the downward.
유갑종,강창수,이충원,엄용균 경북대학교 산업기술연구소 1989 産業技術硏究誌 Vol.17 No.-
In the recent development of internal combustion engine, considerable increase in speed and power has been accomplished. This achievement, however, brought up various problems due to the excessive piston temperature which becomes a crucial factor in engine durability. In this research, temperature distribution in a piston was investigated experimentally and theoretically with varied operation speed in unloaded condition. The method of temperature measuring is L-link system. The theoretical study was carried out by using the finite-element method. A three-dimensional model which simulates a half of piston has been utilized and the surface temperature measured by L-link. System has been used for the theoretical boundary conditions. The results obtained form the analysis of a piston of four-cycle gasoline engine are as follows; The piston temperature increases directly propotional to the engine speed on the thrust plane of piston crown, the temperature in the region closer to inlet valve is found to be higher than that closer to the exhaust valve, and the heating effect by exhaustion and the cooling effect by suction are shown on the iso-thermal line of crown surface. As the thickness of the crown section increased, the degree of symmetry of iso-thermal line about the center-line also increases. The internal and external temperatures of skirt are almost identical, and the temperature decreases away from fro pin-bos. In the case of pin-bos, the temperature of internal is higher than that of external at the lower part, and the temperature decreases along to the pin-perimeter.
金甲植,楊天錫,李忠權 대구산업정보대학 1998 논문집 Vol.12 No.2
New technology has always carried two faces, which are the opportunity and the crisis. Intranet, recently appeared in the computing world, is being accepted as a replacement of traditional Client/Server technology. Since intranet has not been completely built even in its concept, it will give a company the crisis rather than the opportunity. To take the new opportunity for a business and organizational innovation through the intranet, its builder should necessarily acquire the knowledge of the preliminary considerations to the building. The purposes of this article are to define the concept of intranet, to investigate the cases and the building methodologies, and to discuss the preliminary considerations to the building.
유기용제 취급근로자들의 요중대사물질과 말초임파구 자매염색분체교환 발현빈도에 관한 조사연구
김돈균,황인경,류철인,이수일,정갑열,이용환,이충렬,현원일,김석봉,전용덕 大韓産業醫學會 1990 대한직업환경의학회지 Vol.2 No.1
저자들은 유기용제 취급여성근로자 90명을 대상으로 1988년 7월부터 1989년 8월까지 말초혈액임파구에서의 자매염색분체교환의 발현빈도를 조사하고 이들의 업종, 근속연수, 요중마뇨산 농도등이 자매염색분체교환의 발현빈도에 미치는 영향을 조사하였으며 그 결과를 요약하면 다음과 같다. 1. 유기용제 취급근로자들의 말초혈액임파구에서의 자매염색분체교환의 발현빈도는 대조군에 비하여 유의하게 증가되었다. 2. 말초혈액임파구에서의 자매염색분체교환의 발현빈도가 가장 높은 업종은 프라스틱제품 제조업이었다. 3. 근속연수가 말초혈액임파구에서의 자매염색분체교환의 발현빈도에 미치는 영향은 현저하지 않았다. 4. 요중마뇨산농도와 말초혈액임파구에서의 자매염색분체교환의 발현빈도간에는 유의한 상관관계가 있었다. In order to know the possibility of utilizing the sister chromatid exchanges as an index which could evaluate the effect of organic solvents on the health in industrial workers, the authors studied the effects of the inductivity of sister chromatid exchanges in peripheral lymphocytes from 90 female workers expoxed to organic solvents and 20 non-exposed female workers. The results obtained were as follows : 1. The frequency of sister chromatid exchanges in peripheral lymphocytes from 90 female workers exposed to organic solvents was significantly increased in comparison with 20 control subject. 2. The frequency of sister chromatid exchanges was significantly increased in the workers who were employed in the manufacture of plastic materials than the other manufactures. 3. There were no significant differences in the frequency of sister chromatid exchanges by carriers of the exposed workers.
The Review of the Recent Trend in GIS and A New Application to Use GIS in Admissions Offices
Kim, Kap Sik,Yang, Chun Suk,Lee, Choong Kwon,Buttl, Wenke,Lee, Chang Soon 慶山大學校 基礎科學硏究所 1999 基礎科學 Vol.3 No.2
A number of technologies come and go. Korean Oranizations have been swimming through these technogical changes. Since the mid 1990s, the discussion of GIS has been redued, because the GIS appliations could net atrat the managers dealing with the actual business processes. At this point, we review the recent trend of GIS in view of componens of an Effetive GIS, Types of Programs Available, Cost-Benefit Analysis, and examples of GIS, use. Furthermore, although GIS has been used more traditionally in the fields of agriculture, forestry and wildlife management, and archeology or geology, we woule like to attempt a vastly different use of GIS and try to apply the system to the admissions process of universities.
김순갑(Soon-Kap Kim),김병진(Byeong-Jin Kim),이충로(Choong-Ro Lee) 한국해양대학교 해사산업연구소 1994 海事産業硏究所論文集 Vol.4 No.-
A method for quantitative evaluation of the navigational safety of a bulk carrier according to different loading conditions is presented here. Generally, the navigational safety of a ship in various loading condotions is evaluated by a loamanual. However, the loading manual of ship handles only statical factors such as weight and buoyancy of ship without including any wave conditions. Practically ship's safety is much concerned with ship's actions on the rough sea as propeller racing, rolling, deck wetness, vertical acceleration, lateral acceleration, and slamming. These phenomenonena are occurred not by wave or ship's conditions independently but by coreactions of wave and ship's conditions. Response amplitude of ship's motion is manipulated by ordinary strip method(OSM) on a given bulk carrier of 170,000 deadweight tonnage under 6, 7, 8 and 9 Beaufort scale of sea states. Author applied each response amplitude of ship's motion induced by OSM to short-crested and irregular waves for stochastic process of phenomenonena on navigational safety of the bulk carrier. And the occurrence probability of the phenomenon is caculated by Rayleigh's joint probability density function according to different speed and loading conditions of the ship. Utilizing the evaluation indicies, the dangerousness, the maximum dangerousness and the evaluation diagram on the results, author depicted the general safety evaluation diagram. In order to make evaluation simple and effective, author adopted propeller racing and ship's rolling as the representative factors on navigational safety in bulk carrier through clarifying the correlation of factors of stochastic process. The simulation model of the study is 259.00m Lpp, 170,000 d.w.t, single screw, diesel engine operated bulk carrier. And the loading conditions adopted are four, homogeneous full loaded, half loaded, heavy ballast loaded, and normal ballast loaded conditions. This study has presented some different results of dangerousness on ship's varied loading conditions. By applying the evaluation diagrames, navigators are able to avoid dangerousness by keeping away of the danger encountering angle of wave direction which the diagram showes. This evaluation method may be useful for developing the practical safety evaluation system of ships as well as human beings and cargoes at sea.