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농산물(農産物) 건조(乾燥)를 위(爲)한 태양열(太陽熱) 집열기(集熱機)의 제작(製作) 및 이용(利用)에 관(關)한 연구(硏究)
고학균,금동혁,Koh, Hak Kyun,Kum, Dong Hyeug 한국농업기계학회 1982 바이오시스템공학 Vol.6 No.2
In order to improve the quality of traditionally sun-dried red peppers and to increase the efficiency of drying performance, three types of solar dryers were designed and built, and drying performance of the solar dryers was compared to traditional sun drying. Results obtained from the experiment are summarized as fallows: 1. The air temperature and relative humidity profiles over a 8-hour period measured at the specified locations in the drying chamber of solar dryers appeared to have large variation in each dryer. The rate of drying increased with the temperature rise in the drying chamber of the solar dryer. 2. In general. drying with solar dryers proceeded faster than traditional sun drying. With A'-type of solar dryer developed in the second experiment it was possible to dry red peppers in seven days from an initial moisture content of 80% to safe storage conditions. The drying time with the A'-type solar drier was 50% shorter compared to traditional sun drying. 3. Red peppers appeared to have an increasing or constant-rate drying period until the weight of the product was reduced to about one half the initial weight, followed by a falling-rate drying period. When the dried red peppers were exposed to the atmospere during the night, the moisture content increased as much as 6%, which is much higher than for the grains. 4. It was suggested from the experiment that either a heat storage system or a supplemental heating system in the solar dryer was desirable for more efficient drying operation. 5. It was shown that the solar dryer developed in this study may be suitable for drying other vegetables and fishes, and also offered additional advantages of saving in drying time, maintaining sanitation and minimizing contamination by dust, insects and unfavorable weather condition.
고학균 한국농공학회 1972 한국농공학회논문집 Vol.14 No.3
Controlling insects and diseases is an important factor for increasing yields of agricultural products. Power sprayer is widely used in cooperative controlling of insects and diseases for the production of rice and fruits. However, farmers need a long hose to use the power sprayer and that presently most of the farmers have hose made abroad. This study was designed to test the change of outside diameter and unit Iength, and to measure the pressure Ioss for three different kinds of hoses made domestically and one made in Japan. The resulte are as follows; 1. The three kinds of Korean-made hoses showed an increase in the length and a decrease in the outside diameter as the spraying pressure increase. The rate of change of the length ranged from 3.5% to 1.6% and the rate of change of the outside diameter from 3.5% to 1.4% respectively. 2. As the length of hose increases, the pressure loss was $3kg/cm^2$ at the end of a 100m of the hose made in Japan, while it was $7-10kg/cm^2$ for Korean-made hoses. 3. The Korean-made hoses were not broken under $27-28kg/cm^2$ of spraying pressure. 4. As a conclusion, the Korean-made hoses can safely be used under continuous rated pressure of the power sprayer, but they can not properly be used for the case of cooperative controlling system where a long hose is reguired because of the heaviness of the hoses and the narrowness of the inside diametar. Hence, it is highly recommended to improve the Korean-made hoses to be used for such a situation.
농작물(農作物)의 운송(運送)시스템 분석(分析)을 위한 슬램II 시뮬레이션 모델링(I) -운송시스템 모델 개발-
고학균,정종훈,Koh, H.K.,Chung, J.H. 한국농업기계학회 1991 바이오시스템공학 Vol.16 No.2
A simulation model was developed for analyzing a crop transport system using SLAMSYSTEM. The developed model could predict total delivered amount and delivery rate of a crop under various conditions of transport and analyze the effects of work factors on the efficiency of the crop transport system. A simulation model was also developed to analyze a rice transport system based on the generalized model of the crop transport system.
고학균 서울대학교 농업생명과학대학 농업개발연구소 1998 농업생명과학연구 Vol.2 No.-
This study was peformed to analyze the drying performance, quality, and cost of tunnel dryer which may be used in red-pepper powder plants near the main producer across the country. The results showed that after seven or eight hours of drying, the moisture content of red pepper was reduced to 14%(w.b.) which is suitable for processing and long-term storage. As quaility index of drying red peppers, values of L*, a*, b* of tunnel dryer were better than that of conventional batch type dryer. The quantity of capsasin indicating degree of pungency of red pepper powder did not change much during the drying process. Drying cost of tunnel dryer which required to remove one kg of water from red pepper was 21~26% lower than that of conventional batch type dryer.