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계혈등(鷄血藤)이 Rat의 말초신경 재생에 미치는 효과
임승민,안정조,조현경,유호룡,김윤식,설인찬,Lim, Seung-Min,Ahn, Jung-Jo,Jo, Hyun-Kyung,Yoo, Ho-Ryong,Kim, Yoon-Sik,Seol, In-Chan 대한한방내과학회 2009 大韓韓方內科學會誌 Vol.30 No.2
Objective : Gyehyuldeung (GHD) has been widely used in oriental medicine for the treatments of cardiovascular and neurological disorders. Thus, its potential facilitatory activity on axonal regeneration was investigated in the rats. Methods: Sprague-Dawley rats were given crush injury at the sciatic nerve and the changes of axon growth after nerve injury on each nerve injury model were investigated with anti-NF-200 antibody, DiI, GAP-43 protein and Cdc2 protein Results : GHD-mediated enhancement of axonal regeneration after crush injury was measured in both qualitative and quantitative ways by immunofluorescence staining with anti-NF-200 antibody and retrograde tracing of fluorescence dye DiI. GAP-43 protein levels were elevated by GHD treatments in the distal injured sciatic nerve and DRG sensory neurons. The neurite outgrowth of DRG sensory neurons was facilitated by GHD treatment when co-cultured with Schwann cells and astrocytes prepared from injured sciatic nerves and injured spinal cord tissues, respectively. It was observed that Cdc2 protein was up-regulated in co-cultured Schwann cells or astrocytes and Cdc2 protein signals were co-localized to a certain extent with those of phospho-vimentin protein. Conclusions : These results suggest that GHD may play a facilitatory role in axonal regeneration by acting on the injured axons and adjacent non-neuronal cells. The current findings may be useful for the development of therapeutic targets through more specific explorations on molecular interactions between herbal components and endogenous factors.
확률론적 방법을 통한 태양광 발전의 불확실성을 고려한 마이크로그리드 내 경제급전에 관한 연구
임승민(Seung-Min Lim),송진솔(Jin-Sol Song),박우근(Woo-Geun Park),김철환(Chul-Hwan Kim) 대한전기학회 2021 전기학회논문지 Vol.70 No.8
From the Kyoto Protocol until Paris Climate Change Accord, the interest in the eco-friendly energy topic has been gradually emerging. According to this trend, renewable energy resources accounted for 33% of the world"s power generation utilities, and the cumulative size is 2,378 [GW]. As a result of this trend, the domestic Renewable Energy (RE) market is also sustainable growth along with the government’s 2050 Carbon Neutralization strategy. This change in the system requests for an Economic Load Dispatch (ELD) in a state where both demand and supply change from the conventional ELD, which is used to control power generation as demand changes. In this paper, we propose an ELD that considers the intermittency and uncertainty of the Photovoltaic (PV) system. To verify the efficiency of the proposed ELD method, we calculate the expected results through one of the probabilistic methods, using Monte Carlo (MC) simulation and the Probability distribution model. Finally, by determining the optimal generation through Particle Swarm Optimization (PSO) algorithms that are used to consider the input and output characteristics of generators in ELD, we calculate the economic operating profit based on the expected results.
임승민(Seung Min Lim) 대한기계학회 2015 大韓機械學會論文集B Vol.39 No.7
본 연구에서는 나노유체의 유동학 특성을 반영한 히트파이프 열적특성을 연구하였다. Al₂O₃와 CuO 나노입자를 적용한 나노유체를 작동유체로 하여 나노입자 부피비와 응집도에 대한 히트파이프 성능을 확인하였다. 나노입자의 부피비와 응집도가 증가할수록 점성과 열전도도는 증가하는 것으로 나타났으며 두 인자는 히트파이프 성능에 영향을 주었다. 나노입자응집이 없는 경우에는 나노입자의 부피비 증가가 모세관압력한계 성능을 향상시켰지만 응집도가 증가하면 입자부피비가 증가해도 모세관압력한계가 감소했다. 그리고 나노입자의 열전도도, 부피비, 응집도에 대한 히트파이프 열저항을 분석하였다. 히트파이프의 투과율이 높을수록 최대열수송량은 입자부피비에 미치는 영향이 컸으며 3차원 그래프를 통해 윅 특성에 대한 최적화된 나노입자부피비를 확인하였다. In this study, we theoretically investigate the thermal performances of heat pipes that have different nano-fluid properties. Two different types of nano-particles have been used: Al₂O₃ and CuO. The thermal performances of the heat pipes are observed for varying nano-particle aggregations and volume fractions. Both the viscosity and the conductivity increase as the volume fraction and the aggregation increase, respectively. Increasing the volume fraction helps increase the capillary limit in the well-dispersed condition. Whereas, the capillary limit is decreased under the aggregate condition, when the volume fraction increases. The dependence of the heat pipe thermal resistance on the volume fraction, aggregation, and conductivity of the nano-particles is analyzed. The maximum thermal transfer of the heat pipe is highly dependent on the volume fraction because of the high permeability of the heat pipe . For the proposed heat pipe, the optimum volume fraction of the nano-particle can be seen through 3D graphics.
수화반응 모델에 기초한 고성능 시멘트 페이스트의 자기수축 예측에 관한 이론적 연구
임승민 ( Lim Seung-min ),이한승 ( Lee Han-seung ),왕소용 ( Wang Xiaoyong ),이재삼 ( Lee Jae-sam ),노현승 ( No Hyun-seung ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.1
Addition of blended components to cement, especially such as fly ash or silica fume, for the high-performance concrete will lead to a densification of the microstructure. The autogenous shrinkage deformation will increase and the following autogenous shrinkage crack will do harm to durability of concrete structure. In this paper, numerical simulation is suggested to predict autogenous shrinkage of high performance cement paste. The simulation is originated from a multi-component hydration model. The numerical program considers the influence of water to cement ratio, curing temperature, particle size distribution, cement mineral components on hydration process and autogenous shrinkage. The predicted results agrees well with a conventional experimental results.
식물성 플랑크톤의 관유동 내 횡방향 이동현상에 대한 홀로그래픽 실험 연구
임승민(Seung Min Lim),이상준(Sang-Joon Lee) 한국가시화정보학회 2012 한국가시화정보학회지 Vol.10 No.3
Inertial migration phenomena of phytoplankton in pipe flows were investigated using a digital holography technique. As the Reynolds number increases, the microorganisms suspended in a pipe flow are focused at a certain radial position which is called equilibrium position or pinch point. In this study, the effects of the size of microorganism and Reynolds number in the range of 1 < Re < 78 on the inertial migration were investigated and the results are compared with those for solid particles under similar experimental conditions. As a result, the equilibrium position for the elastic microorganisms is not so distinct, compared to the solid particles. This results from deformation of elastic body shape caused by shear-gradient of surrounding flow.