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윤영환 국립7개대학공동논문집간행위원회 2003 공업기술연구 Vol.3 No.-
In order to ferment the food wastes, air with proper temperature and humidity may be supplied. The air passed the moist wastes becomes highly humid air. Then the air should be dehumidified to recirculate into the system. In this paper, a simple double-pipe heat exchanger, in which moist air and refrigerant flow into inner and outer pipes respectively, is tested to dehumidify the moist air. From the experiments, it is found that dehumidification efficiency is 88.9% to 77.9% and overall heat transfer coefficient between moist air and refrigerant is 321.6 to 1091.9W/m2℃ as mass flow rate of air is increased.
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벼 생육중기 및 출수기 태풍 "올가" 건풍에 의한 엽신 피해의 품종간 차이와 수량 및 품질 변화
윤영환,김정곤,정남진,곽강수,강양순 한국국제농업개발학회 2003 韓國國際農業開發學會誌 Vol.15 No.4
1999년 8월3일~8월4일간 태풍 올가 도래시 건풍에 의한 생육중기 엽신 피해의 품종간 차이와 출수기 이삭 갈변에 따른 수량 및 품질에 미치는 영향을 조사하여 다음과 같은 결과를 얻었다. 1. 잎의 증산량 및 수분저하속도가 클수록, 잎이 길이가 길고 폭이 넓을수록 엽신의 피해정도가 컸다. 2. 이삭의 피해 정도가 증가될수록 임실 및 등숙비율은 현저히 낮아지는 경향이며, 쌀 수량은 무피해 대비 피해 3~5는 14~16%, 피해 7은 28%, 피해 9는 48% 감수하였다. 3. 이삭의 피해 정도별 백미 완전미 비율은 피해 정도가 클수록 감소를 보였으며 피해 0~3에서 63~65%, 피해 5~9에서 42~58%의 분포를 보였다. 4. 이삭의 피해정도가 증가할수록 백도 및 색도치가 낮아지며, 단백질 함량은 증가하고 식미치는 저하하는 경향을 보였다. This study was carried out to characterize the influence of dry wind by typhoon "Olga" during Aug. 3~Aug. 4, 1999 on the rice plant(Oryza sativa L.). For the purpose, the affection of the dry wind during the mid-growing stage and heading stage on the leaf damage, yield and rice quality were investigated. The extent of the leaf damage increased with the increase of leaf size and transpiration rate, and also with the decrease of moisture content in the leaves. The percentage of fertile grain decreased in proportion to the increase of the extent of the panicle damage. Compared with none-damaged rice plants in the panicle, the milled rice yield decreased by 14~16% in the degree 3~5 of the panicle damage, and 28~48% in the degree 7~9. The percentage of head rice was the same in the both milled and brown rice in the degree 0~3 of the panicle damage. Above the degree 5, however, it decreased with the increase of the panicle damage. The whiteness and lightness decreased in proportion to the increase of the degree in the unhulled, brown and milled rice. And, there was a tendency that the protein content in the milled rice increased but eating quality decreased with the increase of the panicle damage.
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윤영환,윤건식 國立 昌原大學校 産業技術硏究所 2002 産技硏論文集 Vol.16 No.-
Analysis on fluid flow in rectangular ducts has been conducted because it has a wide range of application. The purpose of this paper is to have comparison between experimental data and numerical computation for fluid flow at low Reynolds number of 1,608 in a rectangular duct with 90˚ elbow. The velocity distributions in the duct are measured by 5W laser doppler velocity meter and numerical result for the fluid flow is computed with commercial software of STAR-CD by assumption of both laminar and turbulent models. From the comparison, it is found that the computation by turbulent model is predicted the experimental data much more than that by laminar model even enough the Reynolds numbers of fluid flow is less than 2,300∼3,000.
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윤영환 경찰대학교 2009 경찰학연구 Vol.9 No.3
It is prescribed in the Article 4 Clause 1 of "act on special cases concerning the settlement of traffic accidents" that a driver who commits a crime by inflicting serious bodily injury through occupational or gross negligence of the crimes relating to traffic accidents shall not be prosecuted in case that he has comprehensive insurance. The law was legislated to fast recovery of the damage given by traffic accidents and to improve convenience in civic life. However, the law has brought undesirable results. It removed criminal responsibility from a driver who caused a grave traffic accident. Consequently, the law hindered driver's awareness of safety, infringed on victims' right to make a statement during proceeding trial and the right of national equality. Recognizing this problem, the Constitutional Court announced the Article 4 Clause 1 of "act on special cases concerning the settlement of traffic accidents" is against the constitutional law. According to the decision of the Constitutional Court, it became possible to prosecute drivers who caused grave traffic accidents. And some changes are expected like decrease of traffic accidents by inspiring awareness of traffic safety, diversification of automobile insurance policy, an increase of the police's work load related to traffic accidents and the specialization of handling grave traffic accidents. If a driver and victim do not come to a mutual agreement, even if the driver has a comprehensive insurance, it is possible to prosecute the driver who caused grave traffic accident so it became important to judge criteria of serious injury in traffic accidents. Except article 258 of criminal law there is no set criteria of serious injury and even article 258 of criminal law does not explain precisely what serious injury is. Moreover, there are almost no judicial cases, related to serious injury caused by traffic accidents, a lack of criteria of serious injury could cause legal disputes. As the Article 4 Clause 1 of "act on special cases concerning the settlement of traffic accidents" is unconstitutional in cases of causing serious injury to victims of traffic accidents, the prosecution sets a guideline concerning serious injury but that guideline is not concrete enough to resolve traffic accidents fairly and accurately. The concept of serious injury should be more concrete and clear than the concept in article 258 of the criminal law, and objective standards and guidelines are needed for this concept. Severity of Disability in the State Tort Liability Act or The Abbreviated Injury Scale (AIS), Injury Severity Score (ISS), which the medical profession uses as a standard of Trauma, can be used as guidelines concerning serious injury. If these guidelines are applied to the Act on Special Cases Concerning the Settlement of Traffic Accidents, it is possible to handle traffic accidents causing serious injury more objectively and clearly. A system in which health and academic experts participate should be set to judge serious injury correctly when the police and the prosecution are resolving traffic accidents.
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윤영환,윤건식 국립7개대학공동논문집간행위원회 2002 공업기술연구 Vol.2 No.-
Flow distributions in a rectangular duct with two branches are measured by 5 W laser doppler velocity meter for analysis of fluid flow in air conditioning ducts. The Reynolds numbers of the fluid flow are from 4,226 to 17,491 based on mean velocity and hydraulic diameter at inlet cross-section of the duct. The velocity profiles are obtained at inlet of the duct and both outlets of two branches. From the measurements, it is found that ratios of flow rates distributed into two branches from the main duct are almost invariant to Reynolds number.
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윤영환,배택희,박원구 한국마린엔지니어링학회 2002 한국마린엔지니어링학회지 Vol.26 No.6
Fluid flow in a rectangular duct with $90^{\circ}$ mitered elbow is measured by 5W laser doppler velocity meter. The fluid flow is also computed by commercial software of STAR-CD for comparison between measured and computed velocity profiles in the duct. Reynolds numbers for the comparison are 1,608 and 11,751 based on mean velocity and hydraulic diameter of the duct. First, the fluid flow of Reynolds number equal to 1,608 is predicted by assumptions of both laminar and turbulent models. But, even though the Reynolds number is less than 2,300~3,000, the computation by turbulent model is closed to the experimental data than that by laminar model. Second, the computation for Reynolds number of 11,751 by turbulent model also predicted the experimental data satisfactorily.
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