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피하조직 삭제술과 CO2 레이저를 이용한 액취증 수술의 임상적 고찰
김상백 ( Sang Baik Kim ),김일환 ( Il Hwan Kim ) 대한피부과학회 2002 大韓皮膚科學會誌 Vol.40 No.12
N/A Background : Axillary osmidrosis is a distressing problem characterized by and unpleasant odor, profuse sweating, and occasionally staining of clothes that may handicap those affected socially, psychologically and in the work place. Various types of surgical procedures have been developed for the treatment of axillary osmidrosis. However, it is still not clear whether which type of surgery can provide the best long-term results. Objective : We evaluated the long-term(more than 2 years) follow-up resole of subcutaneous tissue remover and Carbon Dioxide(CO_2) laser for surgical treatment(Kim`s operative method) of axillary osmidrosis retrospectively. Methods : The number of patients who had been surgically operated wase 132 and among them, 62 patients were interviewed by telephone. The degree of recurrence, scar, satisfaction, the causes of dissatisfaction, and recommendation were evaluated. Results : Thirty-eight of tile 62 patients(61.3%) had no recurrence, Twenty-one patients(33.9%) of the 62 patients had rarely scar, Forty-five patients(72.6%) had a feeling of satisfaction. Conclusion : This combined method has the advantages of a high success rate, low complication rate and Ina scarring for the treatment of axillary osmidrosis baaed on the long-term evaluation. (Korean J Dermatol 2002;40(12) : 1474-1480)
김상백 ( Sang Baik Kim ),유동수 ( Dong Soo Yoo ),송해준 ( Hae Jun Song ),김일환 ( Il Hwan Kim ) 대한피부과학회 2002 대한피부과학회지 Vol.40 No.11
Pilonidal sinus is a chronic inflammatory disease that is associated with hair; a midline hairy patch or pit in the sacral region with a sinus orifice in the bottom, or a cyst beneath it, in which hair is growing. Also, it is considered to belong in the category of follicular occlusion tetrad. It sometimes becomes inflamed, resulting in a subcutaneous abscess with recurrent infection. It becomes symptomatic during adolescence and presents as a foreign body abscess, with hair as the offender. Histological findings show follicular hyperkeratosis of the infundibulum with plugging and dilatation of follicle. Infiltration of hair occurs in one half of the specimens. Also, inflammatory cells are gathering to meet the challenge. The recommended treatment has been surgical excision of the lesion.
우상혁 ( Sang Hyuk Woo ),황을상 ( Eul Sang Hwang ),김상백 ( Sang Baik Kim ),유동수 ( Dong Soo Yu ),김일환 ( Il Hwan Kim ) 대한피부과학회 2003 대한피부과학회지 Vol.41 No.3
A bolster, simply defined, is any device used to support or cushion. In surgery, bolsters have been used under sutures to reduce skin and subcutaneous tension. Bolsters function to reduce the potential for necrosis and laceration by distributing the wound
원자력발전소 격실에서의 수소화염 가속에 대한 수치해석 연구
김종태(Jongtae Kim),김상백(Sang-Baik Kim),김후중(Hoo-Joong Kim) 한국전산유체공학회 2010 한국전산유체공학회지 Vol.15 No.4
Hydrogen safety is one of important issues for future public usage of hydrogen. When hydrogen is released in a compartment, the occurrence of detonation must be prohibited In order to evaluate the possibility of DDT (Deflagration to Detonation Transition) in the compartment with the hydrogen release, sigma-lambda criteria which were developed from experimental data are commonly used But they give a little conservative results because they do not consider the detailed geometrical effect of the compartment. This is the main reason of the need to mechanistic combustion model for evaluation of hydrogen flame propagation and acceleration. In this study, sigma-lambda criteria and combustion model were systematically applied to evaluate a possibility of DDT in a IRWST compartment of APRI400 nuclear power plant during a hypothetical accident. A combustion model in an open source CFD code Open FOAM has been applied for analyses of hydrogen flame propagation. The model was validated by evaluating the flame acceleration tests conducted in FLAME facility. And it was applied to evaluate the characteristics of a hydrogen flame propagation in the IRWST compartment of APR1400.
상온에서 $1100^{\circ}C$까지 온도변화에 따른 콘크리트의 열물성 측정치
신기열,정모,김상백,김종철,Shin, Ki-Yeol,Chung, Mo,Kim, Sang-Baik,Kim, Jong-Chul 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.5
Thermophysical properties and the compressive strength of concrete used in nuclear power plants in Korea were measured. The chemical composition of the concrete was also analyzed. The measured thermophysical properties include the density, the thermal conductivity, the thermal diffusivity and the specific heat for a wide temperature range of 20.deg. C to 1100.deg. C. The chemical composition of Korean concrete is similar to that of US basaltic concrete and the thermophysical properties are strongly temperature dependent. The density, the conductivity and the diffusivity decrease with an increase in temperature, and particularly the conductivity and the diffusivity are a 50-perdent decrease at 900.deg. C as compared with these values at room temperature. The specific heat increases until 500.deg. C, decreases from 700.deg. C to 900 .deg. C, and then increases again when temperature is above 900.deg. C. The measurement beyond 1100.deg. C is not acceptably accurate because the concrete decomposes to a liquid phase from a solid phase at that temperature. The results of this study can be applied, for example, to an analysis of the molten core-concrete interaction (MCCI) phenomenon of concrete structures at high temperature will also require those property data, especially for high temperature ranges.
용융 금속의 고화층 증가가 자연대류 열전달에 미치는 영향
박래준,최상민,김상백,김희동,Park, Rae-Joon,Choi, Sang-Min,Kim, Sang-Baik,Kim, Hee-Dong 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.2
An experimental study has been performed on natural convection heat transfer with a rapid crust formation in the molten metal pool of a low Prandtl number fluid. Two types of steady state tests, a low and high geometric aspect ratio cases in the molten metal pool, were performed. The crust thickness by solidification was measured 88 a function of boundary surface temperatures. The experimental results on the relationship between the Nusselt number and Rayleigh number In the molten metal pool with a crust formation were compared with existing correlations. The experimental study has shown that the bottom surface temperature of the molten metal layer, in all experiments. is the major influential parameter in the crust formation, duo to the natural convection flow. The Nusselt number of the case without a crust formation in the molten metal pool is greater than that of the case with the crust formation at the same Rayleigh number. The present experimental results on the relationship between the Nusselt number and Rayleigh number In the molten metal pool match well with Globe and Dropkin's correlation. From the experimental results, a now correlation between the Nusslet number and Rayleigh number in the molten metal pool with the crust formation was developed as $Nu=0.0923(Ra)^{0.302}$ ($2{\times}10^4< Ra<2{\times}10^7$).
비압축성 열유동 해석을 위한 비엇갈림 격자법에 대한 연구
김종태(Jongtae Kim),김상백(Sang-Baik Kim),김희동(Hee-Dong Kim) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.9
The non-staggered(colocated) approach for which all the solution variables are located at the centers of control volumes are very popular in finite volume methods. Rhie and Chow’s paper is the first in using non-staggered method for incompressible SIMPLE algorithm. They used pressure weighted interpolation to prevent decoupling of pressure and velocity. During the authers’ recent research it was found that Rhie-Chow’s interpolation to define face velocity contaminates velocity fields near walls especially for natural convection problems. The reason to unwanted solution is from overspecified third derivative of pressure in interpolated face velocity. The pressure damping term in face velocity is limited to prevent physically unreasonable solutions. The wall pressure extrapolation which is necessary for cell-centered FVM is another source of numerical diffusion. Some methods are applied in a unstructured FV solver and analyzed in view of numerical accuracy.
김종태(Jongtae Kim),박래준(Rae-Joon Park),김환열(Hwan-Yeol Kim),홍성완(Seong-Wan Hong),송진호(Jin Ho Song),김상백(Sang-Baik Kim) 한국전산유체공학회 2011 한국전산유체공학회지 Vol.16 No.3
A fluid in an enclosure can be heated by electric heating, chemical reaction, or fission heat. In order to remove the volumetric heat of the fluid, the walls surrounding the enclosure must be cooled. In this case, a natural convection occurs in the pool of the fluid, and it has a dominant role in heat transfer to the surrounding walls. It can augment the heat transfer rates tens to hundreds times larger than conductive heat transfer. The heat transfer by a natural convection in a regular shape such as a square cavity or semi-circular pool has been studied experimentally and numerically for many years. A pool of cm inverted triangular shape with 10 degree inclined bottom walls has a good cooling performance because of enhanced boiling critical heat flux (CHF) compared to horizontal downward surface. The coolability of the pool is determined by comparing the thermal load from the pool and the maximum heat flux removable by cooling mechanism such as radiative or boiling heat transfer on the pool boundaries. In order to evaluate the pool coolability, it is important to correctly expect the thermal load by a natural convection heat transfer of the pool. In this study, turbulence models with modifications for buoyancy effect were validated for unsteady natural convections by volumetric heating. And natural convection in the triangular pool was evaluated by using the models.