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졸음운전 방지를 위한 각성도 측정 및 분석시스템(Ⅱ)-눈깜박임 속도의 검출-
이완규(W.K.Lee),고한우(H.W.Ko),김창호(C.H.Kim) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_1
본 연구에서는 자동차 운전시의 운전자의 눈의 움직임을 영상처리를 이용하여 자동으로 검출하고 운전자의 각성도를 인식하는 시스템의 개발을 검토하였다. CCD카메라로 촬영한 얼굴의 동영상으로부터 영상처리에 의해 눈깜박임의 횟수, 속도를 인식하는 방법을 개발하였다 . 이 시스템을 이용하여 여러가지 상황에서의 눈깜박임에 대한 실험을 행한 결과 실용화에 대한 가능성을 확인하였다 .<br/>
이축 하중이 작용하는 구멍 주위에서 피로 균열 발생에 대한 위상차의 영향
허용학(Y.H. Huh),박휘립(P.Park),김동진(D.J. Kim),이완규(W.K. Lee) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
Effect of phase difference on fatigue crack initiation around a hole subjected to biaxial fatigue loads was investigated. Axial and torsional biaxial fatigue loads with different phase differences and biaxiality of 1/√3 were applied to thin-walled tubular specimens. Five phase differences of 0. 45, 90, 145 and 180 degrees were selected. Direction of the fatigue crack initiation around the hole was found to approach to the circumferential direction of the specimen with increment of the phase difference for<br/> fatigue tests with phase difference less than 90˚. Whereas the direction for tests with phase<br/> difference greater than 90˚ was symmetric to that for tests with phase difference less than 90˚. Furthermore, it was shown that the fatigue initiation life decreased with increment of phase difference but it increased for tests with phase difference greater than 90˚ . The crack initiation direction can be successfully explained by using the direction of the maximum tangential stress range obtained around the hole and at far-field.
구조물 신뢰성 설계 및 평가를 위한 재료 물성 데이터베이스 시스템
이완규,허용학,백운봉,박휘립,정인현,안병욱 한밭대학교 생산기반기술연구소 2002 생산기반기술연구소 논문집 Vol.2 No.1
Information on material property may be considerably important in design and evaluation based on reliability in structures including industrial facilities and civil structures. In this study, a database system including the information on properties of the structural materials was developed. The material property constructed in this system includes physical properties, tensile properties, impact properties, hardness properties, fatigue properties, creep properties, fracture properties, and corrosion properties. This system contains 145,000 numeric data of materials property for 600 kinds of metals. In this system designed as user-friendly system, the data can be retrieved through internet and shown in both numeric and graphical forms.
사람의 장관에서 분리한 유산균이 고콜레스테롤 식이를 급여한 흰쥐의 체내 콜레스테롤 함량 및 Lipoprotein Lipase(LPL) 활성에 미치는 영향
정정수,이재준,김진걸,이완규,오창영,이상명 한국축산학회 1999 한국축산학회지 Vol.41 No.6
The current study was undertaken to determine the effects of lactic acid bacteria isolated from human intestine on serum and liver cholesterol concentrations and lipoprotein lipase(LPL) activity of adipose tissue in male Sprague-Dawley rats fed high-cholesterol and high-fat diets. The experiment was conducted for 4 weeks with 48 rats(divided into six groups) fed diets containing 0.5% cholesterol and 10% beef tallow except negative control group. The lactic acid bacteria groups(Lactobacillus CYL-5, Streptococcus CYS-8, Bifidobacterium CYB-11 and 3 Strains Mixed) were orally administered with 0.2㎖ lactic acid bacterial culture(10^8-10^9 cfu/㎖) per day. The positive control group received the same diets as the lactic acid bacteria administered groups, but with no lactic acid administration. The regular commercial diet was supplied for the negative control group. Serum total cholesterol and LDL-cholesterol concentrations were significantly(p$lt; 0.05) reduced by administration of Lactobacillus CYL-5 and 3 Strains Mixed. However, there were no significant differences in serum triglyceride and HDL-cholesterol concentrations among the groups. Administering lactic acid bacteria to the rats significantly(p$lt;0.05) also reduced their liver total cholesterol wncentration compared to the positive control rats. Liver triglyceride concentration in Streptococcus CYS-8, Bifidobacterium CYB-11 and 3 Strains Mixed groups were significantly(p$lt; 0.05) lower than that of positive control group. The total lipid concentration in liver was significantly(p$lt; 0.05) lower in 3 Strains Mixed group than in positive control group. LPL activities of epididymal fat pads and mesenteric fat pads in lactic acid bacteria administered groups were lower than that of the control(p $lt; 0.05). LPL activity of mesenteric fat pads were lower than the activity of epididymal fat pads(p$lt;0.05). These results suggest that lactic acid bacteria isolated from human intestine acts as a hypocholesterolemic agent in rats.
임순재,이주광,이완규,최만용 한국산업안전학회 1997 한국안전학회지 Vol.12 No.1
Precision electronic equipments for outdoor use are composed of sophisticated microcircuits that are extremely vulnerable to lightning-caused voltage spike. This transient voltage spike may cause upset, latent failure or interference on electronic equipments. In order to develop efficient lightning protection measures on AC power lines of a road traffic controller as a electronic equipment: for outdoor use, experimental surge immunity tests were conducted according to IEC standard 801-5. The combination of gas tube arrester and metal-oxide varistor was installed at the input of AC power lines and the silicon avalanche suppressor installed at the output of DC power supply for the lightning protection measures.