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송범호(Bum Ho Song),송성진(Seung Jin Song) 한국유체기계학회 2000 유체기계 연구개발 발표회 논문집 Vol.- No.-
Secondary flows in gas turbines, especially those associated tip clearance and labyrinth seals, have become a focus of interest for engine manufacturers. In the past, many analytical and experimental studies, which focused solely on the flows in either tip clearances or seals, have been conducted. This paper presents an analytical model that describes the flow response in a single stage turbine induced by a finite sealing gap at the turbine rotor. The flow is assumed to be axisymmetric and the analysis is done in the meridional plane. Upon going through the stage, the radially uniform upstream flow is assumed to split into two streams one associated with the seal and the other which has gone through the blades. The former is referred to as the leakage flow, and the latter is referred to as the passage flow. The passage flow is assumed to be inviscid and incompressible while the flow in the seal can be modeled as either inviscid or viscous. Thus, the model is capable of predicting the kinematic effects of labyrinth seals on the turbine flow field.
학령전 아동의 성장에 영향을 미치는 환경요인 연구 : 신장-체중 지표에 의한 분석 Analysis with Weight-Length Index
문현경,송범호,정해랑 대한보건협회 1992 대한보건연구 Vol.18 No.1
To identify important environmental factors affecting growth of children in Korea, 906 children between 4 and 6 years old were studied in Seoul and Chunsunggun. Anthropometric measurements and interview were done by trained interviewers between May and June, 1988. Heights and weights were converted to WLI(Weight-Length Index). With WLI, 11.7% of surveyed children was underweight, 65.4%, was normal. 15.8% was overweight and 7.1% was obese. Each factor was compared by WLI groups by the analysis of variance. Mean of father's weight and mother's weight were significantly different among WLI groups(P<0.01). Mean of father's height and mother's height showed no differences among WLI groups(P>0.05). Proportions of children from urban area were higher in overweight and obese group than that from rural area(P<0.05). Mean of father's schooling showed no difference, but mother's schooling were increasing by increasing WLI(P<0.05). Mean of family incomes and housing index were increasing by increasing WLI(P<0.01). There were no significant differences in eight nutrient intakes among WLI groups. Generally, normal and overweight group has higher nutrient intake than underweight and obese group. For the growth of preschool aged children, socio-economic factors seems to be important determinants in Korea.
레토르트 파우치 포장재의 사용조건에 따른 이행물질의 조사
이만술,송범호,박선오,이부영,이영자,윤혜경,엄미옥,성준형,전대훈 한국포장학회 2007 한국포장학회지 Vol.13 No.3·4
The effect of microwave heat to retort pouches and microwavable packages was examined. 186 products were collected, but packages were consisted of five package materials such as PET, Aluminum foil, Nylon, EVOH, and polypropylene. The results showed that all packages did not exceed the limits of current packaging regulation on consumption weight of KMnO4, TDI(Toluene diisocyanate), and Caprolactam. Safety control on heat resistant packages considered satisfactory, but investigation on new substances should be continued for preventing any possible migration problems of packaged foods.
한국인의 상용 식품중 무기질함량과 분석방법 비교연구 : 1. 나트륨 1. Sodium
문현경,정해랑,송범호,이주돈,김희재,황성희 한국식품위생안전성학회 1991 한국식품위생안전성학회지 Vol.6 No.3
In order to observe the Na contents, Korean common foods, especially processed foods were analyzed by Atomic Absorption Spectrophotometer. 1. The Na contents of instant noodle (ramen) was 400-900 mg/100 g and Na contents of their soup powder was 10000-16000 mg/100 g. 2. The Na contents of corns snd beans was very low but their processed foods, corn flake and soybean milk, had relatively high Ns contents. 3. The Na contents of meats was 40-60 mg/100 g but the Na contents of meats products was 700-900 mg/ 100 g. 4. The Na contents of flavoring salt was 12000-38000 mg/100 g, those of soybean products was 3000-6000 mg/100 g, and that of seasoning MSG was 8000-17000 mg/100 g. 5. There was no statistical difference between the results of wet ash method and dry ash method in the Na contents of all food groups.