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상추種子 活力의 生化學的 評價硏究 : Ⅰ. Ethylene生成 Ⅰ. Ethylene Evolution
禹永澮,朴大榮,李政明 경희대학교 부설 식량자원개발연구소 1992 硏究論文集 Vol.13 No.-
Studies were conducted to find out relationship between the vigor of lettuce and the production of ethylene from germinating seeds of i5 cultivars and lines at 3 different temperatures. The effect of red light illumination and the effect of ACC (1-aminocyclopropane-1-carboxylic acid) and red light on seed germination and ethylene production were also investigated. major results can be summarized a s follows. 1. The lettuce seeds with greater ability of producing ethylene germinated better at high temperatures (25 and 30℃). Highly significant, positive correlations were found between the ethylene evolution and the germination rate at both tested temperatures. 2. Red light treatment significantly increased ethylene evolution and the seed germination rate at 25℃. Treatment of ACC in addition to the red light illumination further increased the germination rate as compared to the red light treatment alone. 3. Red light treatment a t high temperatures was found to be effective in releasing the thermodormancy induced by high temperatures, but the effectiveness varied considerably depending upon the cultivars.
국소 전기자극이 백서의 임의형 피부판 생존에 미치는 영향
유병표,김영우,허우회,박병림 大韓成形外科學會 1991 Archives of Plastic Surgery Vol.18 No.1
Many experimental studies have demonstrated beneficial effect of electrical field application to various hard and soft tissues. The present study was undertaken to determine if application if application of exogenous electric fields could improve survival rate of random pattern skin flap in rats. 32 Spraque-Dawley rats were divided into 4 groups and caudally based random pattern flaps of 2x8cm in size were elevated in all experimental animals. Silver electrodes were implanted into the fascia to apply the electrical stimulation(-5V, 0.2ms, 20hz) to the skin flap. Electrical stimulation was applied 3 times for 1 hour daily and it was continued to the 5th day. It is concluded that exogenous electrical stimulation shows a possibility of the enhancement of flap survival rates by increasing the rates to 3.2%(P<0.01).
조백현,김영길,허우회,최석현 大韓成形外科學會 1983 Archives of Plastic Surgery Vol.10 No.2
The purpose of this study was to investigate the sequential changes of enzyme activities in severely burned skin of rat at intervals of 2 hours, 8 hours, 1 day and 3 days by histochemical methods. The results obtained were as follows. 1. Acid phosphatase activity was found to be transient increase in dermis and mild decrease in epidermis, hair follicle and sebaceous gland at 2 hour after burning. The activity was not seen in skin after 8 hours. 2. Alkaline phosphatase was found to be decreased in blood vessel and dermal papillae of hair follicle at 2 hour after burning and then was progressively decreased after 8 hours. 3.α-naphtyl acetate esterase activity was found to be decreased in epidermis, dermis and hair follicle at 2 hours after burning and was not seen in skin after 8 hours. There was no significant changes in sebaceous gland after burning.
좌골신경손상 흰쥐의 가자미근과 내측비복근 위축에 대한 전기자극 효과
박병림,허우회,유병표,김영우,김대영 대한성형외과학회 1992 Archives of Plastic Surgery Vol.19 No.3
This experimental study includes the effect of intermittent electrical stimulation of the muscle on the atrophic response of peripherally denervated muscles. Rats(Sprague -Dawley, 240-260gm) were subjected to a severance of the sciatic nerve and mechanical properties of contraction including contraction time, half relaxation time and maximum twitch tension, maximum tetanic tension and fatigue index were observed on the slow(soleus m.) and fast(medial gastrocnemius m.) muscles 10days after serverance of the sciatic nerve. Experimental groups were divided into three groups : control group(CONT) immediately after severance of sciatic nerve, denervation group(DN) 10days after severance of sciatic nerve, and denervation plus eletrical stimulation group : (DN-ES) denervation combined with intermittent eletrical stimulation of muscles directly. Optimal frequency of electrical stimulation was 20㎐ for soleus muscle and 40㎐ for medial gastrocnemius muscle under 0.5ms of pulse width and supramaximal intensity. In DN group, muscle weight and mechanincal properties of contraction were significantly decreased compared with the control group. In DN-ES group, however, muscle weight and mechanincal properties were significantly increased compared with the denervation group. These data indicate that intermittent electrical stimulation of muscles may be useful in decreasing the muscle atrophy in peripherally denervated muscles.
이제준(Je-Jun Lee),이영신(Young-Shin Lee),김재훈(Jae-Hoon Kim),변성우(Seong-Woo Byun),김현수(Hyun-Soo Kim),구송회(Song-hoe Koo),문순일(Soon-Il Moon) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
The combustor, diffuser and nozzle are main components of the ramjet engine. The objective of this study is thermo structure analysis of the combustor. The combustor is composed of 17-4 PH stainless steel housing and Inconel 718 liner. Temperature conditions of housing and liner are quite different. The combustor liner is rapidly heated up to 700℃, so that is reached plastic zone locally. The temperature of combustor housing rises to 400℃. The thermal stress of liner is large than housing stress. The nonlinear thermal analysis with mechanical properties of both housing steel and liner inconel such as Young’s modulus, thermal expansion coefficient and thermal conductivity is conducted. The analysis of the transient temperature and thermal stress of combustor is carried out the finite element method with code Nastran. The structural assessment of combustor is evaluated.