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사이클론-백 하이브리드형 집진장치에서 유동연결부 설계조건에 따른 유동균일성 전산해석
구성모,오원철,장혁상,Koo, Seongmo,Oh, Wonchul,Chang, Hyuksang 한국입자에어로졸학회 2016 Particle and Aerosol Research Vol.12 No.4
Numerical analysis was done to evaluate the movement of the particles and the fluid inside of the cyclone-bag hybrid dust collector. Flow discharged from the cyclone in the hybrid particle collector has swirl pattern, and it results in the biased flow to the bag filters and deteriorates the collection performance of the bag filter. The current study is to evaluate the effect of the duct lengths and the baffle arrays in the connection duct by the computational methods. Main concerns of the analysis are how to improve the uniformity of the internal flow between the cyclone and the bag filter. Numerical analysis was done to check the particle removal efficiencies of the system with respect to the flow characteristics which is expressed in RMS values of the upward flow inside of the connection duct. The flow pattern inside of the connection duct is evaluated under different the duct lengths and the baffle arrays. In case of the reference geometry the RMS value of inside flow was 56.7%, and the value was decreased to 30.1% by controlling the lengths of duct. The effects of baffle was also evaluated, the RMS value of flow could be decreased 55.2% and so on. But the pressure drop across the baffles becomes high and the system efficiency becomes lower.
對金飮子가 알코올 투여로 유발된 흰쥐의 간 지방 병증과 면역억제의 예방에 미치는 영향
김정자(Jeongja Kim),서부일(Buil Seo),최홍식(Hongsik Choi),김승모(Seongmo Kim),우창훈(Changhoon Woo),구진숙(Jinsuk Koo),박규열(Gyuryeol Park) 한국한의학연구원 2010 한국한의학연구원논문집 Vol.16 No.2
Objective : The present study has been undertaken to investigate the preventive effects of Daekumeumja on fatty degeneration of liver and immunosuppression induced by alcohol in rats. Method : Except for the normal group, we fed rat on 25% alcohol for 55 days. And Daekumeumja(DK) extract was administrated for the same period. We measured the serum component in rat's blood, weight of internal organs, liver triglyceride contents, histomorphometry and histopathological observation of internal organs. Results : 1. In the change measurement of serum components, DK group(50 ㎎/㎏, 200 ㎎/㎏) showed significant decrease of AST, ALT, albumin, ALP and triglyceride in comparison with those of the alcohol control group. 2. In the change measurement of internal organ's weight, DK group(50 ㎎/㎏, 200 ㎎/㎏) showed significant increase of relative body weights of liver, thymus and spleen in comparison with those of the alcohol control group. 3. DK group(50 ㎎/㎏, 200 ㎎/㎏) showed significant decrease of hepatic triglyceride contents in comparison with those of the alcohol control group. 4. In histomorphometrical changes of liver, DK group(50 ㎎/㎏, 200 ㎎/㎏) showed significant decrease of numbers of hepatocytes occupied by over 10 % lipid droplets, percentages of regions occupied by lipid droplets and mean diameters of hepatocytes in comparison with those of the alcohol control group. In histomorphometrical changes of thymus, DK group(50 ㎎/㎏, 200 ㎎/㎏) showed significant increase of lobular thickness and cortex thickness in comparison with those of the alcohol control group. In histomorphometrical changes of spleen, DK group(50 ㎎/㎏, 200 ㎎/㎏) showed significant increase of splenic thicknesses, numbers of white pulps and mean diameters of white pulps in comparison with those of the alcohol control group. 5. In histopathological changes of liver, DK group(50 ㎎/㎏, 200 ㎎/㎏) showed effective inhibition of severe fatty changes in comparison with those of the alcohol control group. In histopathological changes of thymus and spleen, DK group(50 ㎎/㎏, 200 ㎎/㎏) showed effective inhibition of atrophic changes in comparison with those of the alcohol control group. Conclusions : Reviewing these experimental results, it appears that Daekumeumja have pharmaceutical preventive efficacy on fatty degeneration of liver and immunosuppression induced by alcohol in rats.