http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 김학선 ( Kim Hak Sun ) (검색결과 167 건)
- 무료
- 기관 내 무료
- 유료
-
김학선,이승수,남광현,김용달,홍창문,심규철,김응철,Kim. Hak-Sun,Lee. Sung-Su,Nam. Kwang-Hyun,Kim. Yong-Dal,Hong. Chang-Moon,Shim. Kyu-Cheoul,Kim. Eung-Chul 한국방재학회 2007 한국방재학회 학술발표대회논문집 Vol.2007 No.1
Damages induced typhoons have been increased and super-typhoons have occurred frequently. In our study, we propose a storm risk assessment technique based on CFD for the industrial structures and equipment located in the coastal regions. Inflow wind speeds are obtained through the information of geography and meteorology in considering regions before pressures of wind-environment and structures corresponding to different winds are calculated with wind speed multiplier and pressure coefficient. The results are applicable to evaluate a warning wind speed or regions vulnerable to debris in a considering region and to examine the safety of structures and their exteriors.
-
골담초근의 생리활성 -고지질, 고혈당 및 간손상에 미치는 영향-
김학선,김일혁,Kim, Hak-Sun,Kim, Il-Hyuk 한국생약학회 1992 생약학회지 Vol.23 No.2
The studies were attempted to evaluated the therapeutic effects of various fractions(ether, methanol, butanol) of Caragana chamlagu roots on the hyperlipemia induced by feeding the diet containing 1%, cholesterol and 0.5%, cholic acid in rats, and on the hyperglycemia induced by streptozotocin in rats. Also the preventive effects of these fractions were studies on the liver damage in $CCl_4-intoxicated$ rats. The followings were obtained as the results: 1.The butanol fraction was significantly shown to down the serum lipid level in 1%, cholesterol and 0.5%, cholic acid diet-feeding rats and streptozotocin-induced hyperglycemic rats. Cholesterol level in $CCl_4-intoxicated$ rats was reduced in the case of all pre-treated groups. 2.The serum glucose level of streptozotocin-induced hyperglycemic rats was significantly decreased by the administration of various fractions of C. chamlagu roots, and the lipid-peroxidation of pancreas was significantly decreased in the case of administration of these fractions. 3.The activates of s-GOT and s-GPT were decreased by the administration of various fractions, especially in butanol fraction, of C. chamlagu roots in the $CCl_4-intoxicated$ rats. The liver lipid-peroxidation was decreased by administration of 200mg/kg of these fractions in the $CCl_4-intoxicated$ rats. In histological observation, hepatic cellular necrosis and fatty acid deposit were increased remarkably by $CCl_4-intoxication$, but the pretreatment of various fractions of C. chamlagu roots improved the pathological change of parenchymatous cell necrosis and fatty change around centrilobular area of the control.
-
마이크로파 중합에 의한 의치상 레진의 물리적 성질에 관한 연구
김학선,김광남,장익태,Kim, Hak Sun,Kim, Kwang Nam,Chang, Ik Tae 대한치과보철학회 1990 대한치과보철학회지 Vol.28 No.2
The purpose of this study was to investigate the physical propertise and determine whether three were any differences in the amount of porosity of the denture base resins cured by microwave irradiation and conventional water bath heating. The resins used in this study were K-33 resin and Acron MC resin. The properties selected were transverse strength, Knoop hardness, and density. A ten-power eyepiece and scanning electron microscope(Magnification of ${\times}$ 30and ${\times}$150)were used to examine the specimens for porosity. Through analyses of the data from this study, the following conclusions were obtained. 1. Microwave energy can be effectively use dtopolymerize poly(methylmethacrylate) denture base resins. 2. In the transverse strength, K-33 resin cured by microwave irradiation was the first highest, water bath cured K-33 resin the second, microwave cured Acron MC resin the third, water bath cured Acron MC resin the fourth. 3. In the Knoop hardness, K-33 resin cured by microwave irradiation was the first hardest, water bath cured K-33 resin the second, water bath cured Acron MC resin the third, microwave cured Acron MC resin the the fourth. 4. No significant difference was found between the density of resin denture bases polymerized by either method. 5. K-33 resin showed the most porosity for the microwave curing. But there was no significant difference in the Acron MC resin and other curing method.
-
국소의치용 티나늄의 피로도 및 물리적 성질에 관한 연구
김학선,김광남,장익태,Kim Hak-Sun,Kim Kwang-Nam,Chang Ik-Tae 대한치과보철학회 1994 대한치과보철학회지 Vol.32 No.2
The purpose of this study was to compare the fatigue, physical properties, flexibility and surface roughness of titanium used in removable partial dentures with those of a type IV and alloy and a cobalt- chromium alloy. Fatigue testing subjected the test specimen to rapid cycling at a given stress until failure occurred by using a small-sized, electrodynamic type bending fatigue testing machine. The S-N curves for the framework materials were generated. For tensile testing, a tensile bar as described in the ADA Specification No.14 was subjected to tensile loading until failure occurred. Load-displacement curves were generated for 18 gauge round specimen and tapered half round specimen. Then the flexibilities were calculated. The surface roughnesses were compared by analyzer. Through analyses of the data, the following conclusions were obtained. 1. The fatigue property of titanium was higher than that of a type IV gold alloy$(p\leq0.05)$, but there was no significant difference between titanium and a cobalt-chromium alloy $(p\geq0.05)$. 2. The yield strength, the ultimate tensile strength and Victors hardness of titanium were higher than those of a type IV gold alloy but lower than those of a coalt-chromium alloy$(p\leq0.05)$. 3. The percentage of elongation and reduction of area of titanium were the highest $(p\leq0.05)$. 4. The surface roughness of titanium was the greatest$(p\leq0.05)$. 5. The flexibility of titanium was lower than that of a type IV gold alloy but higher than that of a cobalt-chromium alloy$(p\leq0.05)$.
-
-
-
-
-
감차수국의 채엽시기와 추출조건에 따른 이화확적 특성에 관한 연구
김학선 ( Hak Sun Kim ),박상일 ( Sang Ill Park ),최형일 ( Hyung Il Choi ) 조선대학교 공학기술연구원 2009 공학기술논문지 Vol.2 No.1
In this study, it results to effect of Nitrogen, amino acids, antioxidant activity by picking time of Hydrangea macrophylla var.thunbergii and compare to phyllodulcin`s content by extraction condition. There was not different in the moisture content 9.08 ~ 9.11 % by Hydrangea macrophylla var.thunbergii picking time. Total nitrogen content of SP-I(July), SP-II(August) and SP-III(September) was each 4.33 ± 0.76, 3.82 ± 0.43 and 3.98 ± 0.34%. SP-I which was the earliest high picking time. The content of minerals depend on early of picking time had many K, Na, Fe, Cu, Ni and late of picking time had many Ca, Al, Mn, Zn. It is desirable to pick it up earlier for the high quality. Because the content of vitamin C was increased by progressing maturity, but the main soluable component as amino acids, caffeine, the total nitrogen was decreased. The content of amino acids was high when picking time was earliest. The antioxidant activity of SP-I 3.09, SP-II 3.70, SP-III 4.73% was lowest when picking time was latest. This results the studying to Hydrangea macrophylla var.thunbergii by extraction condition. The phylloducin`s content of water extraction and 5% ethanol extraction were highest at 60℃.
-
ScienceON연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
