계면처리와 스타칭이 복합적층판의 파괴거동에 미치는 영향 연구

홍순영,황운봉,박현철,한경섭,Hong, S.Y,Hwang, W,Park, H.C,Han, K.S 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.3

The interlaminar fracture behavior of woven laminates under static and cyclic loadings has been studied using DCB(double cantilever beam) specimens. The effects of surface treatment and stiching on the fracture behavior of composite laminates are investigated experimentally. Fracture toughness has been improved by surface treatment because the surface treatment can change the fracture mechanism of laminates. SCB(stitched cantilever beam) model has been proposed to quantify the effect of through-thickness resinforcement(stiching) in improving the delamination crack growth resistance. Distributed loads which are transfered to through-thickness fibers can be calculated by the SCB model. And fracture energy increase due to the distributed load can be predicted by a power function of the distributed load. A new parameter agreed well proposed predict fatigue crack growth rate. The predictions using this parameter agreed well with the experimental data.

양배추 시들음병균 Fusarium oxysporum f. sp. conglutinans의 특성과 품종별 저항성 검정

고순보(S. B. Ko),김기택(G. T. Kim),김성배(S. B. Kim),홍순영(S. Y. Hong),박용봉(Y. B. Park) 한국원예학회 1999 원예과학기술지 Vol.17 No.2

저에너지 세척 및 건조 시스템 기술 개발

박균명(G. M. Park),범민욱(M. W. Beom),홍순영(S. Y. Hong),최근영(K. Y. Choi),고종원(J. W. Go),최강영(K. Y. Choi) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4

Washing and drying system uses high pressure and temperature of the water and steam and it is inevitable energy losses that occur during operation due to the reduced efficiency of the system. The losses arising from parts discarded after use, resulting in a waste exhaust energy, the energy re-circulation system technology was developed. Energy saving / energy guard unit improves the efficiency of the heat.

사과의 감압저장법의 개발

손태화,윤형식,홍순영,서정훈,김광수,박용태,이갑랑,권태종 慶北大學校 生産技術硏究所 1970 生産技術 Vol.4 No.-

Rolls, Janathan, and American Summer Pearmain were used in this experiment. This experiment was conducted under 0˚ and 20℃ at subatmospheric pressure, respectively. we found to examine physiological changes of apple under storage and the rate of respiration of apple in order to decide the time of harvesting. The summary results were as follows. A. Physiological Changes of Apples Stored Under Reduced Atmospheric Pressure. 1. Rate of Respiration (1) Lower rates of respiration were observed under reduced atmospheric pressure than under normal atmospheric pressure other storage conditions being equal. (2) American Summer Pearmain apples showed the biggest rate of respiration, followed by Jonathan apples. Rolls apples showed the smallest rate of respiration among three varieties. (3) The rate of respiration of apples stored under reduced atmospheric pressure changed less remarkably than that of apples stored under normal atmospheric pressure when these apples were taken out of the storage rooms, and their surrounding temperature and atmospheric pressure were changed. (4) change of the rate of respiration was more marked in an O^2-chamber than in an air-chamber. A serious physiological breakdown was observed in a N_2-chamber and in a CO_2-chamber. 2. Production of Ethylene (1) The action of ethylene as a ripening hormone for apples was supressed by reducing the atmospheric pressure of the storage chamber. (2) The order of amount of ethylene production was American summer Pearmain, Jonathan, and Rolls. The ethylene production was larger under reduced atmospheric pressure than under normal atmospheric pressure without respect to the variety of apples. (3) Ethylene production of apples was reduced by lowering the temperature of the storage chamber (4) The rate of ethylene formation increased markedly when apples were stored in a cold chamber and than the temperature and atmospheric pressure were changed. This phenomenon, however, was less marked for the apples stored in the reduced atmospheric pressure chamber than for those in the normal atmospheric pressure chamber. (5) The ethylene production in the O_2-storage chamber was about 80 times as large as that in air-storage chamber at 20℃. The rate of ethylene production reached a maximum in 12 days in the O_2-chamber, but the ethylene production increased continuously in the air-chamber. In the N_2-chamber and the CO_2-chamber ethylene production was small. Generally the ethylene concentration in the atmosphere of the storage chamber was smaller under reduced atmospheric pressure than under normal atmospheric pressure. 3. Acidity Acidity was lowered from 0.68% to 0.36%, 0.50%, or 0.56% when Jonathans were stored in an uncontrolled atmospheric chamber, a cold and uncontrolled atmospheric pressure chamber, and a cold and reduced atmospheric pressure chamber respectively. 4. Change of Weight Decrease in weight under the same conditions as the above 3, was 6.2%, 3.6% and 2.8% when stored in an uncontrolled chamber, in a cold and uncontrolled atmospheric pressure, chamber, and in a cold and reduced atmospheric pressure chamber respectively. 5. Decaying Decaying ratio showed also the same order as 4, and was 18.5%, 7.4%, and 3.6% in an uncontrolled chamber, in a cold and uncontrolled atmospheric pressure chamber, and in a cold and reduced atmospheric pressure chamber respectively. 6. Enzyme Activity (1) Catecholase activity of apples decreased with storage duration. (2) The order of catecholase activity was Rolls, American summer Pearmain and Jonathan. (3) Catecholase activity was higher in apples stored under reduced atmospheric pressure than in those stored under normal atmospheric pressure regardless of the variety. B. Preliminary Investigations for Practical Uses 1. It is possible to calculate the concentration of carbon dioxide in a storage chamber atmosphers since the rate of carbon dioxide production was almost constant according to the storage conditions. Therefore the storage chamber was successfully maintained at 5% carbon dioxide by controlling ventilation. 2. With a simple automatic controller, the storage chamber atmosphere was maintained at an appropriate reduced pressure. 3. Poly ethylene film, which is most permeable for gases among several common plastic films, was found to be adoptable as an apple wrapper for reduced atmospheric pressure storage. C. Investigation of the Time of Harvest Observations of the rate of respiration of apple during growing made in possible to predict the optimal time of harvest. The optimal times of harvest are around September 23 and October 26 for Jonathan and Rolls apples respectively.

과실의 감압저장법에 관한 연구(Ⅱ) : 감압도에 따른 저장성 비교(홍옥) Preservation of Jonathan under Various Pressures of Storage Chamber

김광수,홍순영,손태화,이갑랑 한국농화학회 1969 Applied Biological Chemistry (Appl Biol Chem) Vol.11 No.1

In order to determine an optimum pressure condition of the storage chamber of apples, several reduced pressure were examined for the Jonathan. The results obtained checking various storage conditions are as follows. 1. The optimum pressure of chamber atmosphere for apple storage was 10 ㎝Hg. 2. Under the pressure of 10 ㎝Hg, the normal (room) temperature storage was better than the cold storage. 3. Under reduced pressure. poly-ethylene film wrapping of apple showed a good result in a short-term (less than one and half month) experiment. 4. No noticeable effect was observed by O.E.D (Oxy-ethylene doxanole) or sodium dehydro acetate treatment. 5. Change of the components (total sugar, reduced sugar, acid and vitamin C) of apples according to the storage methods showed similar results to our previous report, Studies on The Reduced Pressure Storage of Fruits (I).