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진공건조기 내부 압력 변화에 따른 수분 이동에 관한 연구
최순열(S. Y. Choe) 군산대학교 수산과학연구소 2004 군산대학교 수산과학연구소 연구논문집 Vol.4 No.-
The method of drying agricultural, marine, and forest products is different according to the kinds of dried products, but can be classified into hot air drying, vacuum drying, freezing drying and electro-magnetic wave drying. The present vacuum drying keeps pressure within the body in state of high vacuum pressure, eventually it lowers the saturation temperature and dries products in 20-30℃, which is the same as natural drying temperature, in the state that oxygen is shut-off. Vacuum drying technique, whose drying time and quantity of exhausting energy is about 1/ 3-1/4 of hot air drying, is very excellent in the drying efficiency. As the results. it took about 20 hours for material to reach about 18% of the final moisture content in order to store products for a long time, from about 45% of the early moisture content at the beginning of drying, and maximum drying rate comes to about O.30kg/m²hr at about 350% of the moisture content.
최순열(S. Y. Choe) 군산대학교 수산과학연구소 2004 군산대학교 수산과학연구소 연구논문집 Vol.5 No.-
Accelerated industry development and urbanization during the last three decades have led serious water pollution problems in many parts of the nation. Especially, in region of west and south coast have low fresh water in the dry season of spring and summer. In the place isolated from land, it is important to secure the fresh water for drinking and general service. This study is concerned on the development to low-pressure evaporation type fresh water generator of capacity Hon/day by non-operating boiler in the season of summer. The results obtained from this study are as follows. The maximum production quantity was 1.1ton/day at pressure 40mmHg abs. and temperature 80℃. The water quality showed good coincidence with the calculated values.
진공건조기 내부 압력 변화에따른 수분 이도에 관한 연구
최순열(S.Y.Choe) 군산대학교 수산과학연구소 2000 水産科學硏究 Vol.- No.16
The method of drying agricultural, marine, and forest products is different according to the kinds of dried products, but can be classified into hot air drying, vacuum drying, freezingdrying and eletro-magnetic wave drying.The present vacuum drying keeps Dessure within the body in state of high vacuumpressure, eventualIy it lowers the saturation temperature and dries products in 20∼30℃,which is the same as natural drying temperature, in the state that oxygen is shut-off.Vacuum drying technique, whose drying time and quantity of exhausting energy is about 1/3∼l/4 of hot air drying, is very excellent In the drying efficiency.As the results, it took about 20 hours for material to reach about 18% of the final moisturecontent in order to store products for a long time, from about 450% of the early moisturecontent at the beginning of drying, and maximum drying rate comes to about 0.30kg/㎡hr at about 350% of the moisture content.
알루미늄 합금재의 미소원공결함이 피로크랙 전파거동에 미치는 영향
김건호(G.H.KIM),임재근(J.K.LIM),최순열(S.Y.CHOE),이호연(H.Y.LEE) 한국항해항만학회 2008 한국항해항만학회 학술대회논문집 Vol.2008 No.공동학술
We carried out with materials of aluminum alloy(7075-T6, 2024-T4) by rotary bending fatigue tester. We investigated fatigue limit, fatigue crack initiation, fatigue crack propagation behavior and possibility of fatigue life prediction to the different small circular hole defect. The summarized result are as follows ; Fatigue limit of the smooth specimens were related tensile strength and yield strength. In case of more large applied stress and small circular hole crack defect, the fatigue crack was grown rapidly. The fatigue crack propagation behavior proceed at according to inclusion. Fatigue crack propagation ration appeared instability and retardation phenomenon in the first half of fatigue life but appeared stability and replied in the latter half. We are think on account of size of the small circular hole defect. On other hand, this experimental data of the materials are appeared fatigue life predictability.