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김혜숙(Kim, Hey-Suk),도주연(Do, Ju-Yeon) 한국인체미용예술학회 2010 한국인체미용예술학회지 Vol.11 No.4
This study was conducted to examine the effect of naturopathy on the preventing hair loss and improving hair growth. eight men were selected as the subjects of this study. after they took herb medicine and spread with aroma oil and cleaned with herb soap and took scalp meridian massage, the change of hair and scalp condition, the numbers of hairs, and thickness of hairs was examined. It appeared that the amount of hair loss decreased gradually and new thin hairs were generated after receiving the treatment. first, the changes in scalp of both groups shown in the scope after the treatments reveal that the experiment group has viable results in the number and thickness of hair than the comparison group. second, before the treatment, the average number of hairs in 0.20㎠ was approximately 10.13±1.55, which was below one third of that of normal people who had 27 hairs in the 0.20㎠. after hair treatment for three months, the average of hairs increased to 25.00±2.56(P<0.0001). the thickness of hair also increased from 0.0210± 0.0042mm to 0.0430±0.0072mm.(p<0.001) third, the changes in the hair condition of the comparison group after hair treatment indicated that the hair counts increased from 11.00± 1.20 to 16.00±1.51 the thickness hair increased from 0.0200±0.0037mm to 0.0310±0.0020mm. in result, a comparison between the two groups after the hair treatment identified that the naturopathy could be effective for the hair loss treatment. this study presents basic date for applying the naturopathy in hair loss treatment and thereby effectively address hair loss with more natural substance.
김혜숙(Hey Suk Kim),신미수(Mi Soo Shin),장동순(Dong Soon Jang),이대근(Dae Geun Lee) 大韓環境工學會 2007 대한환경공학회지 Vol.29 No.6
본 연구의 목적은 기존의 산업용 보일러에서 이산화탄소 배출저감을 위하여 연소가스 재순환에 의한 고온 순산소 연소기술을 개발하는데 있다. 이를 위해 실험실 규모의 LNG 연소기에서 연소 화염특성을 평가하기 위한 조직적인 수치해석 연구가 일차적으로 수행되었다. 특히 본 연구에서 고려한 중요한 변수는 산소부화환경에서 계산된 연소가스의 재순환 정도이다. 배기가스 재순환이 없는 100% 순산소 연소환경에서 화염은 고온의 길고 가는 층류형상의 화염을 보였다. 이는 산화제 중에서 질소성분이 감소함으로써 약화된 난류혼합효과와 N2 가스에 의한 현열손실의 감소에 기인하는 것으로 판단하였으며 문헌에 발표된 실험과 일치된 결과를 보였다. O₂/CO₂ 혼합가스에서 CO₂ 가스의 재순환율이 증가될수록 산화제의 유량 증가에 따른 강화된 난류혼합으로 인해 최고 화염온도가 버너 근처로 이동한 반면 전반적인 연소가스 온도는 N2에 비해 CO₂의 높은 비열로 인해 낮아지는 현상을 보였다. 결국 80% 이상 CO₂ 가스를 재순환한 경우 연소가스의 온도가 급격하게 떨어지는 화염소멸 현상을 보여주었다. 그러나 30% O₂/70% CO₂의 혼합 연소조건에서는 기존의 공기연소와 유사한 가스온도를 나타내었다. 이외에도 공기연소와 동일한 유량조건에서 난류강도와 열수지 측면에서 화염특성 변화를 평가하기 위한 면밀한 연구가 수행되었다. The ultimate objective of this study is to develop a reliable oxygen-enriched combustion techniques especially for the case of the flue gas recycling in order to reduce the CO₂ emissions from practical industrial boilers. To this end a systematic numerical investigation has been performed, as a first step, for the resolution of the combusting flame characteristics of lab-scale LNG combustor. One of the important parameters considered in this study is the level of flue gas recycling calculated in oxygen enriched environment. As a summary of flame characteristics, for the condition of 100% pure O₂ as oxidizer without any flue gas recycling, the flame appears as long and thin laminar-like shape with relatively high flame temperature. The feature of high peak of flame temperature is explained by the absence of dilution and heat loss effects due to the presence of N2 inert gas. The same reasoning is also applicable to the laminarized thin flame one, which is attributed to the decrease of the turbulent mixing. These results are physically acceptable and consistent and further generally in good agreement with experimental results appeared in open literature. As the level of CO₂ recycling increases in the mixture of O₂/CO₂, the peak flame temperature moves near the burner region due to the enhanced turbulent mixing by the increased amount of flow rate of oxidizer stream. However, as might be expected, the flue gas temperature decreases due to presence of CO₂ gas together with the inherent feature of large specific heat of this gas. If the recycling ratio more than 80%, gas temperatures drop so significantly that a steady combustion flame can no longer sustain within the furnace. However, combustion in the condition of 30% O₂/70% CO₂ can produce similar gas temperature profiles to those of conventional combustion in air oxidizer. An indepth analyses have been made for the change of flame characteristics in the aspect of turbulent intensity and heat balance.
김혜숙(Hey-Suk Kim),신미수(Mi-Soo Shin),장동순(Dong-Soon Jang),박병수(Byung-Soo Park),엄태인(Tae-In Um) 한국전산유체공학회 2002 한국전산유체공학회 학술대회논문집 Vol.2002 No.-
A 3-D axisymmetric computer program is developed to predict the NO behavior in SNCR system for the stoker incinerator with the waste treatment capacity, 200ton/day. To this end a turbulent reacting flow field calculation is made using proper assumption and empiricism. The stoker bed is assumed to be a homogeneous waste-volatilized gaseous state. The initial composition or reactants are assumed based on the data of the ultimate analysis. Turbulent is resolved by k-£ model and turbulent reaction is handled by eddy-breakup model harmonized with empirical chemistry data for gaseous combustion, NO and urea reaction. The liquid droplet is traced by Lagrangian method incorporated by aerodynamic drag, Coriolis and centrifugal forces. Radiation is treated by sensible heat loss model. Calculation results are in good agreement with experimental data at the outlet of post combustion chamber in Daejon 4th industrial complex. The flue gas shows the temperature range of 900~1000℃, velocity of 5m/s and NO concentration of 140ppm at the exit while the measured temperature, flue gas velocity and NO concentration are 967℃, 3~4m/s and 100~200ppm respectively. Using the developed computer program a parametric study has been made with the variation of heat content of waste, castable length and SNCR variables for the determination of proper injector location. In general, the calculated results are consistent and physically acceptable.