기능성 의류소재 개발에 관한 연구 : 태권도복을 중심으로

학위논문(석사)--서울대학교 대학원 :의류학과,2002.Maste

Wearing comfort of caps according to textile properties

학위논문(박사)--서울대학교 대학원 :의류학과,2007.Docto

Self Q-switching effect of a CW mode-locked Nd:YLF laser by cavity length detuning

학위논문(박사) - 한국과학기술원 : 물리학과, 1993.2, [ iii, 106 p. ]한국과학기술원 : 물리학과

누출유 분석과 그 응용

학위논문(석사) - 한국과학기술원 : 화학공학과, 1978, [ iii, 60 p. ]During preliminary research for dynamic study, a leakage oil which was assumed to be Korean crude oil was analyzed to determine whether the oil is crude or waste, in which gas chromatographic and ASTM analyses, mixing tests, comparison with foreign crude oils, prediction of hydrogen content, and impurities tests were conducted. And a bridge from gas chromatogram of oil to ASTM curve was built for any size oil sample treatments. The batch tests demonstrated that the oil characteristics would change by selective adsorption and by selective solubility during the oil migration through the underground structures, and suggested the study in dynamic leakage oil characteristics for valid oil evaluations. Silica gel was used instead of clay or sand for adsorption experiments. The oil passing out through the silica gel and water, the UOP K factor varies as functions of the oil and water flow rate, the quantity of silica gel the oil passes through, and the history of the leaked oil under isothermal and isobaric conditions. And, it was found from adsorption experiment of oil on silica gel that a component in $C_{11}$ boiling range is most selectively adsorbed and was taken as a key component. The key component concentration varies also with the same parameter as the case of UOP K factor. The empirical equations were obtained for these two key variables, K and the key component, and could be used for evaluating the original location of the leakage oil source and the original characteristics of the leakage oil. In these studies the other two empirical equations were obtained i.e., the volume average boiling point and the UOP K factor can be predicted from volume average carbon number which can easily be calculated from the gas chromatogram of oil, by use of the two equations.한국과학기술원 : 화학공학과

액- 액추출계에 있어서의 액적수 평형 모델

학위논문(박사) - 한국과학기술원 : 화학공학과, 1984.2, [ xii, 160, [71] p. ]For calculation of mass transfer rate in a liquid-liquid extraction system the solution of the trivariate drop population balance model was obtained by computer simulation, in which probability density of the drop population was expressed in terms of drop volume, solute content in the drop, and drop age. The Coulalogou``s drop interaction model was employed for describing the drop phenomena, and a moving boundary diffusion model was used for mass transfer calculation. In the simulation the quiescence interval method, differentiation of the constant stirred tank contactor, and ten random number were introduced. The numerical solution of the moving boundary diffusion equation was obtained, and a modified solution which gave the same results as the numerical solution was also obtained by inserting a factor into the analytic solution of the fixed boundary diffusion model. The calculated results of the model are in good agreement with reported data and experimental data in this study. The effect of drop collision on the effective diffusivity was fully discussed, and concluded that the effective diffusivity was depended mainly on the dispersed phase hold-up in the region that the rigid body assumption was valid.한국과학기술원 : 화학공학과

Validity of a Simulated Practical Performance Test to Evaluate the Mobility and Physiological Burden of COVID-19 Healthcare Workers Wearing Personal Protective Equipment

This study evaluated the validity of a newly developed mobility protocol examining the comfort functions and requirements of personal protective equipment (PPE) for COVID-19 healthcare workers. Eight males (age: 24.7 ± 3.0 y, height: 173.4 ± 2.3 cm, and body weight 69.9 ± 3.7 kg) participated in the following three PPE conditions: (1) Plastic gown ensemble, (2) Level D ensemble, and (3) Powered air purifying respirator (PAPR) ensemble. The mobility protocol consisted of 10 different tasks in addition to donning and doffing. The 10 tasks were repeated twice at an air temperature of 25oC with 74% RH. The results showed significant differences among the three PPE conditions in mean skin tem- perature, local skin temperatures (the forehead, thigh, calf, and foot), clothing microclimate (the chest and back), thermal sensation, thermal comfort, and humidity sensation, while there were no significant differences in heart rate or total sweat rate. At rest, the subjects felt less warm and more comfortable in the PAPR than in the Level D condition (P<0.05). How- ever, subjective perceptions in the PAPR and Level D conditions became similar as the tasks progressed and mean skin and leg temperature became greater for the PAPR than the Level D condition (P<0.05). An interview was conducted just after completing the mobility test protocol, and suggestions for improving each PPE item were obtained. To sum up, the mobility test protocol was valid for evaluating the comfort functions of PPE for healthcare workers and obtaining require- ments for improving the mobility of each PPE item.N

METHOD FOR MEASURING THICKNESS OF SAMPLE USING TERAHERTZ SIGNAL

본 발명에서 제1 기준 신호는 수분과 같은 극성 분자가 존재하지 않는 기준 공기 중에서 단지 1회만 획득하면 충분하고, 제2 기준 신호 및 샘플 신호는 수분과 같은 극성 분자가 존재하는 일반 공기 중에서 획득되는 신호이며, 이와 같은 본 발명에 의하면 샘플의 두께 측정 시마다 반드시 건조 공기나 질소 공기를 조성해야만 하는 종래 방법에 비해 샘플의 두께 측정이 간편하고, 샘플 두께의 측정 시간 또한 크게 단축시킬 수 있는 이점이 있다