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최상범(S. B. Choi),조대환(D.H. Cho),봉태근(T.G. Bong) 한국마린엔지니어링학회 2009 한국마린엔지니어링학회 학술대회 논문집 Vol.2009 No.-
A flow field around submerged vertical plate is investigated experimentally. Vortices are generated at the tip of each side of the plate. The largest vortices at each side of the plate eventually grow to the size of the water depth. The vortex shedding process can be divided into three phases: the formation of a separated shear layer, the generation and shedding of vortices, the formation of a vortex, and the impingement onto the upper flow.
최상범(S.B. Choe),조대환(D.H. Cho),최주열(J. Y. Choi),이철희(C.H. Lee) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
The objectives of model ship(1:100) test are aimed to ensure the reducing effects of exhaust gas return phenomena through the ship structure converting and the flow visualization test of exhaust gases emitted from the stack. The influences of variations of ship speed and wind velocity are evaluated in the wind tunnel test. Plume gas flow patterns were visualized and investigated by using a paraffin smoke generator and laser beam in the large wind tunnel test center.
사무직 중년여성의 신체질량지수 차이에 따른 신체구성, 심폐기능 및 건강관련 체력의 비교분석
조상우 ( S. W. Cho ),김수경 ( S. K. Kim ),최상범 ( S. B. Choi ),심승용 ( S. Y. Shim ) 한국운동생리학회(구 한국운동과학회) 2011 운동과학 Vol.20 No.1
본 연구는 사무직 중년여성을 대상으로 신체질량지수 차이에 따른 신체구성, 심폐기능, 건강관련 체력을 비교분석하여 사무직 중년여성의 건강관리에 필요한 기초자료를 제공하는데 그 목적이 있다. 본 연구의 대상은 행정관리 업무에 종사하는 연령 40~49세의 사무직 중년여성공무원 119명 정상집단(18.5 kg~22.5 kg/㎡) 41명, 과체중집단(23~24.9 kg/㎡) 40명, 비만집단(25~29.9 kg/㎡) 38명으로 나누어 신체구성, 심폐기능, 건강관련체력 검사를 실시하였다. 본 연구의 자료처리는 각 집단 간의 신체구성, 심폐기능, 건강관련 체력요인의 비교를 위하여 일원변량분석(one way ANOVA)을 실시하였고, 상관검증은 피어슨의 상관계수(Pearson correlation coefficient)를 이용하였으며, 통계적 유의수준은 p<.05 수준으로 하였다. BMI 차이에 따라 신체구성에서 체중, 체지방률, WHR은 정상집단 과 매우 유의한 차이를 보이며 과체중집단(p<.001), 비만집단(p<.001) 순으로 높게 나타났으며, 과체중집단과 비만집단 간에도 비만집단이 유의한 차이를 보이며 높게 나타났다( p<.001). 심폐기능에서 FVC는 정상집단이 유의한 차이를 나타내며 과체중집단(p<.05), 비만집단( p<.01) 보다 높게 나타났다. 건강관련 체력에서 체중당 악력은 정상집단과 유의한 차이를 보이며 과체중집단(p<.01), 비만집단(p<.01) 순으로 높게 나타났다. VO2max는 정상집단이 유의한 차이를 나타내며 과체중집단(p<.05), 비만집단(p<.001) 보다 높게 나타났다. 앉아윗몸앞으로숙이기는 정상집단이 유의한 차이를 나타내며 과체중집단(p<.05), 비만집단( p<.01) 보다 높게 나타났다. BMI와 신체구성, 심폐기능, 건강관련 체력 과의 상관관계에서 체중(p<.001), 체지방률(p<.001), WHR(p<.001), DBP(p<.05), SBP( p<.05), 체중당 악력(p<.01)과 정적 상관관계가 있는 것으로 나타났고, FVC(p<.01), VO2max(p<.001), 앉아허리앞으로숙이기(p<.01)와는 부적 상관관계가 있는 것으로 나타났다. 이상의 결과에서 BMI가 높을수록 체중, WHR, 체지방률, 체중당 악력은 높고, FVC, VO2max, 앉아윗몸앞으로숙이기는 낮게 나타나 BMI의 차이가 신체 건강에 미치는 영향을 볼 수 있었으며, 이러한 관계는 지방과 관련된 신체구성 증가, 심폐기능 저하, 건강관련 체력의 기능 저하로 이어져 부정 적인 영향이 미친다는 것을 알 수 있다. 특히 장기간 동안 신체활동이 제한되어 생활하는 사무직 여성종사자들에게 미치는 영향은 더욱 클 것으로 생각되며, 이들에 대한 체계적인 건강관리가 필요할 것이다. The purpose of this study was to investigate the difference of body composition, cardiopulmonary function, and health related physical fitness on office worker of middle-age women. Subjects of this study were 119 females office workers who were 40-49 years old. They were separated normal(18.5~22.9 kg/㎡, n=41), overweight(23~24.9 kg/㎡, n=40), obesity group(25~29.9 kg/㎡, n=38) by BMI. They measured body weight, % body fat, WHR, FVC, SBP, DBP, rest heart rate, grip strength, sit-up, VO2max, and sit and reach test. The data was analyzed by using descriptive statistics, one-way ANOVA, and correlation analysis. First, Normal group was significant difference overweight(p<.001) and obesity group(p<.001), and overweight group was significant difference obesity group(p<.001) for body weight, WHR, and % body fat. Second, Normal group was significant difference overweight(p<.05) and obesity group(p<.01) for FVC. Third, Normal group was significant difference overweight(p<.01) and obesity group(p<.01) for grip strength/body weight. Normal group was significant difference overweight(p<.05) and obesity group(p<.001) for VO2max. Normal group was significant difference overweight(p<.05) and obesity group( p<.01) for sit and reach test. Fourth, BMI was positively associated with body weight(p<.001), % body fat(p<.001), WHR(p<.001), DBP(p<.05), SBP(p<.05), and grip strength/body weight(p<.001) and was negatively associated with FVC(p<.01), VO2max(p<.001), and sit and reach test(p<.01) in correlation analysis.
다양한 형태의 다공질 Calcium Polyphosphate의 생분해성에 관한 장기적인 연구
양승민,설양조,계승범,이인경,이철우,김석영,이용무,구영,한수부,정종평,최상묵,류인철,Yang, S.M.,Seol, Y.J.,Kye, S.B.,Lee, I.K.,Lee, C.W.,Kim, S.Y.,Lee, Yong-Mu,Ku, Y.,Han, S.B.,Chung, C.P.,Choi, S.M.,Rhyu, I.C. 대한치주과학회 2003 Journal of Periodontal & Implant Science Vol.33 No.2
The purpose of this study is to evaluate the biocompatibility and the biorsorbability of several types of calcium polyphosphate made through change of manufacturing process for 12 month. To solve limitation of calcium phosphate, we developed a new ceramic, Calcium Polyphosphate(CPP), and report the biologic response to CPP in extraction sites of beagle dog. Porous CPP blocks were prepared by condensation of anhydrous $Ca(H_2PO_4)_2$ to form non-crystalline $Ca(PO_3)_2$ and then milled to produce CPP powder. CPP powder, CPP block, and CPP granules added with $Na_2O$ were implanted in extraction sockets and histologic observation were performed at 12 months later. Like 3 months results, histologic observation at 12 months revealed that CPP matrix were mingled with and directly apposed to new bone without any adverse tissue reaction, CPP powder show direct bony contact, but new bone formation and fibrous tissue encapsulation showed in CPP block. 10% $Na_2O$ CPP granules show more inflammatory cells infiltration around graft materials compared at 3 month, but 15% $Na_2O$ CPP granules show less. This result revealed that regardless of addition of $Na_2O$, CPP had a high affinity for bone and had been resorbed slowly. From this results, it was suggested that CPP is promising ceramic as a bone substitute and addition of $Na_2O$ help biodegradation but optimal concentration of $Na_2O$ and other additive component to increase degradation rate should be determined in further study.