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김석우,김성만,현명택,최동호,고정삼,박영하 제주대학교 공과대학 첨단기술연구소 2001 尖端技術硏究所論文集 Vol.12 No.2
The low temperature storage method has been used to increase the value of agricultural products by reducing quality deterioration and controlling respiration rate. The respiration rate of agricultural products depends on several factors such as temperature, moisture, gas composition and microbe inside the storage room. Among that temperature is the most important factor, which affects respiration rate and causes severe damage. The results obtained from these experiments are that electric consumption is decreased as setting temperature is decreasing and temperature deviation is increasing. In the ventilation experiment, the case ventilated four times a day(every six hours a day) with ten minutes operation each time, was inspected require as much electric consumption as non-ventilation case.
김석우,김성만,현명택,최동호,고정삼,박영하 제주대학교 공과대학 첨단기술연구소 2001 尖端技術硏究所論文集 Vol.12 No.2
The heat performance in a forced circulating cool storage room was numerically investigated. A commercial PHOENICS package was used to simulate 3-D airflow. For solving the governing equations a standard k-ε turbulent model was implemented to calculate steady state turbulent velocity and temperature distributions. The results show that the large air contacting area of products increases the storage quality, because the airflow between products helps to remove the heat from the products by convective heat transfer.
Rosacea : Clinical Study of 67 Cases
Koh, Woo Seok,Chun, Duk Kyu,Seo, Seung Lee,Park, Sang Man,Kim, Myeon Soo,Kim, Bang Soon,Lee, Sang Suck 대한피부과학회 2001 Annals of Dermatology Vol.13 No.1
Background : Rosacea is a chronic skin disease which primarily affects the face. There have been many basic and clinical studies on rosacea in the West, but little in Korea. Objective : This study was to investigate clinical features of rosacea in Korea and to compare them with those in the West. Methods : During a 20-month period, 67 patients diagnosed as having rosacea were examined for their clinical presentations by means of personal interview. Results : Erythema and telangiectasia were found in almost all of the 67 patients. Camparing with the results in the West, flushing and telangiectasia were more common whereas papules, pustules, and rhinophyma were less common with no case of ocular complaints or migraine. Conclusion : Because early detection and treatment is necessary to prevent the progression of rosacea, it is important to realize that rosacea is not uncommon in Korea and to recognize its somewhat different clinical manifestations from those in the West.
Koh, Woo-Seok 全北大學校 1973 論文集 Vol.15 No.-
陰函數 Φ(x, y)=0 이 條件으로 주어졌을 때 f(x, y)의 最大, 最小를 求하는 問題에서 f,Φ를 x,y에 關한 偏微分을 하여 거기에서 얻어지는 Jacobian에서 Lagrange의 乘數入이 얻어지며 이 入의 導入에 依해 條件附問題는 無條件問題로 還元된다. 여기서 條件式과 考察의 對象의 函數間에는 極値와 極値 사이의 雙對的인 關係가 있다. 또한 이 Lagrange乘數法의 한 變化로써 Linear Programming에서의 Simplex法을 考察할 수 있고, Quadratic Programming에서 이 乘數法이 여러가지 計劃法의 基礎를 이루는 解를 줌을 알 수 있다. There are a number of significant similarities between the mathematics used in ancient times and the mathematics best adapted to electronic Computers today. These similarities are due to the fact that mathematicians long ago operated under some of the same constraints that apply to computers today. The following table exhibits these ideas in more concise form. Mathematicians in ancient times 1. had to work with limited numeration systems. 2. had to substitute hard works for sophistication. 3. had to use computational methods which were simple to understand. Electronic computers today 1. are designed to use simple numeration systems. 2. compensate with speed what they lack in sophistication. 3. are limited in the type and number of instructions they can accept. Because of these similarities, the numerical analyst who studies ancient mathematies may find ideal algorithms which would be suited to the modern electronic computer today.
고우석(Woo Seok Koh),윤재일(Jai Il Youn) 대한피부과학회 1992 대한피부과학회지 Vol.30 No.5
Calcipotriol, a synthetic analogue of calcitriol(1,25-dihydroxyvitamin D) is as active as calcitriol in inducing cell differentiation and inhibiting cell pralifiration but at least 100 times less active than calcitriol in its effect on calcium metabolism. We report a case of psoriasis in a 28 year old male who was treated with calcipotriol ointment on the right forearm. The therapeutic effect of calcinoipotriol ointment was compared with desoxymethason, cream applied on the left forearm. Both topical agents reduced equally the degrees of scale, erythema and thickness of the lesions. We observed that the calcipotriol ointment was effective in the treatment of psoriasis n this case. (Kor J Dermatol 1992,30(5):674-678)
UVB에 의한 한국 청년층의 최소홍반량과 최소색소량에 관한 연구
고우석(Woo Seok Koh),정진호(Jin Ho Chung),윤재일(Jai Il Youn),신용우(Young Woo Shin) 대한피부과학회 1994 대한피부과학회지 Vol.32 No.2
Background : The erythemal response and delayed tanning of the skin to UV radiations which are used as diagnostic phototest and guideline of phototherapy are different according to the races and light sources. Objective : The MED and MMD induced by UVB radiation were measured in 130 normal young adult Koreans. Methods : In this study, a high pressure mercury are lamp(Burdick UV-800) and a sunlight fluorescent lamp(Waldmann UV 800) were used as UVB light sources. Multiple sites of the lower baek or buttock skin were irradiated with an increasing dose by a constant, anount. The minimal doses of erythema response and delayed tanning of the skin were assessed visaually at 24 hours and 7 days after irradiation, respectively. Results : MED and MMD of Burdick UV-800 are 18.0+9.8mJ/cm(mean+S.D.), 29.7+12.5mJ/cm, respectively. MED and MMD of Waldmann UV 800 are 70.8+28.5mJ/cm and 91.2+33.1mJ/cm, respecively. The most frequent MED by Burdick UV-800 is 10mJ/cm and those by Waldmann UV 800 are 50m J/cm and 60m J/cm. Conclusion : In this study MED and MMD of young adult Koreans by two kinds of UVB light sources were assessed. The results : how that MED is less than MMD and the levels of MED under which the photosensitivity is suggested are 5.6mJ/cm by Burdick UV-800 anr 32.4mJ/cm by Waldmann UV 800. (Kor J Dermatol 1994; 32(2): 253-257)
고우석(Woo Seok Koh),문상은(Sang Eun Moon),김방순(Bang Soon Kim),윤재일(Jai Il Youn) 대한피부과학회 1992 대한피부과학회지 Vol.30 No.3
Hydrochlorothiazide is a diuretic drug used in the treatement of edema and hypertension. We report a case of hydrochlorothiazide induced photosensitivity in a 54 year old woman who had taken hydrochlorothiazide for 3 years for hypertension. She complained of itching and burning sensation with erythematous papules and lichenified plaques on light-exposed areas. Fhototest showed marked decrease of the minimal erythema dose(MED) for UVA. The symptoms subsided after the use of topical steroid and the substitution atenolol for hydrochlorothiazide. (Kor J Dermatol 1992; 30(3): 373-376)