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관을 흐르는 균일입자 - 모래 - 물 슬러리의 최소수송속도
김홍태,이철수,한균석,박찬교 한국화학공학회 1984 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.22 No.3
비구형 입자인 모래와 물의 슬러리계에서 최소 수송 속도를 구하기 위해 입자의 크기를 측정치 않는 침강 속도의 함수로 관련식을 제시하였다. 고체 농도가 약 1-20% 범위의 실험에서 농도가 15%까지는 농도에 따라 최소 수송 속도가 증가한 반면, 그 이상의 농도에서는 고체 입자의 농도에 무관하였다. The minimum transport velocity of sand-water slurry system in the concentration range of 1-20 volume % has been correlated in terms of particle settling velocity. Minimum transport velocity of slurries increased with the concentration of sand until the value reaches 15%. Thereafter, the minimum transport velocity is independent of slurry concentration.
Carbon Tetrachloride로 유발된 Rat의 간장과 신장 손상시 헛개나무 추출액의 치료효과
김홍태,김대동,구세광,김주완,임미경,오태호,이근우 한국임상수의학회 2011 한국임상수의학회지 Vol.28 No.1
Hovenia dulcis Thunb (HDT) has been known folk medicine and has been used as therapeutic drug in the treatment of liver disease. Also it has been used as a detoxifying agents for alcoholic poisoning and promoting diuresis. However, there has not been any study on therapeutic effect of Hovenia dulcis extract on CCl4 induced liver and kidney damage in rats. In this study, we report on therapeutic effects of Hovenia dulcis extract on CCl4 induced liver and kidney damage in rats. Rats were divided into four groups of eighteen animals. Control group (DW) was administrated with distilled water 2.5 mL/kg per peritonial administration and then CCl4 group (CCl) was administrated CCl4 2.5 mL/kg per peritonial administration, CCl4+ HDT extract group (CCl4+ HDT) was administrated HDT extrat (100 mg/kg) after CCl4 2.5 mL/kg administration, CCl4+ Silymarin group (CCl4+ Sily) was administrated Silymarin (50 mg/kg) after CCl4 2.5 mL/kg administration. The complete blood cell (CBC) count of RBC, WBC, PCV, Hb, MCH,MCV, MCHC and blood chemistry profile of AST, ALT, GGT, ALP, Total choloesterol, Tryglyceride, Total bilirubin,Amylase, Glucose, BUN, Creatinine, Lipase and pathologic changes were observed for 7 days after administration of D.W., CCl4, CCl4+ HDT extract, CCl4+ Silymarin. The results are as follows : 1. RBC and PCV were significantly (p < 0.01) increased in all groups compared to D.W. but hemoglobin, MCH, MCV and MCHC were not showed significant difference during experimental periods. 2. AST, ALT, T-cholesterol, T-bilirubin, TG were significantly (p < 0.05) increased in all groups on day 3 compared to D.W. and were normal on day 7. 3. ALP was significantly (p < 0.05) decreased in CCl4+ HDT group on day 3 but Amylase was not showed significant difference during experimental periods. 4. BUN was significantly (p < 0.05) increased in CCl4 group on day 7, but CCl4+ HDT group and CCl4+ Sily group were normal. Creatninie was significantly (p < 0.05) increased in CCl4 group on day 3 and normal on day 7 but CCl4+ HDT group and CCl4+ Sily group were not showed significant difference during experimental periods.
On Conditions to Satisfy White-Box Cryptography
김홍태 보안공학연구지원센터 2014 보안공학연구논문지 Vol.11 No.2
Though there have been a few trials to give the white-box cryptography, there is no secure system with that property. In this paper, we deal with the conditions to get the white-box cryptography.
해상교통 안전성 평가를 위한 인간공학 실험평가 기초연구
김홍태,황태현,심우성,장준혁,하욱현 해양환경안전학회 2012 해양환경안전학회 학술발표대회 논문집 Vol.2012 No.04
해양운송분야에서 인적 오류의 비중 및 피해가 막대하지만, 선박운항자 관점에서의 안전성 평가를 위한 구체적인 수단이나 기술의 개발은 미흡하며, 해양사고의 예방을 위한 인간공학적 시험평가 기법 및 항해장비와의 인터페이스 설계를 위한 관련 연구가 미흡하다. 즉, 해상교통 안전성 평가를 위한 선박운항 시뮬레이터의 활용도와 신뢰성을 높이기 위한 정량적 지표의 개발이 시급히 요구되고 있다. 본 논문에서는 해상교통 안전성 평가를 위한 인간공학적 실험평가 기
김홍태,신동석,김용석,Kim, Hong Tae,Shin, Dong Seok,Kim, Yong Seok 한국농공학회 2014 한국농공학회논문집 Vol.56 No.6
Vulnerable areas by non-point source pollution and prioritizing control areas were researched using hydrological and geomorphological data, non-point source loads, and water quality data. Using overlay analysis, vulnerable areas were graded with various scenarios. Vulnerable areas were selected near the metro city with impermeable landuse because non-point source loads and water quality data had influence on overlay analysis to rank vulnerable area. Analysis scenarios and weighted values can be changed under regional characteristics and given conditions.