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광도파 원리의 평면형 태양광 집광기 설계를 위한 광학해석
한종호(Jong Ho Han),김종선(Jong Sun Kim),황철진(Chul Jin Hwang),윤경환(Kyung Hwan Yoon),강정진(JeongJin Kang) 대한기계학회 2012 大韓機械學會論文集A Vol.36 No.1
최근 태양광발전 시스템에서 태양광을 집광하는 광학기술이 접목된 집광기가 대두되고 있다. 본 연구에서는 광도파로 원리를 기반으로 한, 간단하면서 생산이 용이한 새로운 개념의 평면형 집광기를 제안하였다. 해당 집광기에서는 태양광 집광을 위하여 빛의 전반사와 굴절의 법칙에 의해 빛을 유도하는 마이크로 단위의 광학 패턴이 적용되었다. 본 집광기의 주요 설계변수로는 광도파 집광기의 기하집 광비 Rc와 마이크로 패턴의 두 각도 θ1, θ2를 선정하였다. 광학해석을 위한 시뮬레이션은 SPEOS로 수행되었으며 주요 설계변수의 변화에 따른 집광기의 광학효율을 예측하였다. 기하집광비 4, 5, 6에 대해서 광학효율 최대치가 각각 65.60%, 54.78%, 46.78%로 예측되었다. 집광기의 마이크로 패턴의 두 각도 θ1, θ2 및 태양광 입사각에 따른 광학효율도 예측하였다. Recently, an optics-based concentrator for solar concentration has been a key issue in development of photovoltaic systems. In the present study, a new, simple, easily producible planar concentrator based on a light guide system is proposed. In this device, solar light is concentrated by microprism optical patterns guiding the light, mainly through total reflection and refraction. The main design variables of the concentrator are the geometric concentration ratio (Rc) and the θ1 and θ2 of the microprism pattern. Ray tracing was simulated using commercial software, SPEOS, and the optical efficiencies of the light guide solar concentrator were predicted in each case. The predicted maximum optical efficiencies are 65.60%, 54.78%, and 46.78%, respectively, for Rc values of 4, 5, and 6. The variation of the optical efficiencies according to θ1, θ2, and the incline angle of the incident light were predicted.
유정선 ( Jung Sun Yoo ),황진경 ( Jin Kyung Hwang ),오치혁 ( Chi Hyuk Oh ),김승민 ( Seung Min Kim ),신재령 ( Jae Ryung Shin ),이태인 ( Tae In Lee ),윤경환 ( Kyung Han Yoon ),이철현 ( Cheol Hyun Lee ),김진배 ( Jin Bae Kim ) 전북대학교 의과학연구소 2013 全北醫大論文集 Vol.37 No.1
A 24-year-old man was admitted to our institution with implantable cardioverter-defibrillator (ICD) pocket infection. The ICD (single chamber, dual coils) was implanted for aborted sudden cardiac death due to hypertropic cardiomyopathy presenting as ventricular fibrillation. He complained of the redness, pain, skin abrasion at ICD pocket site for 7days. With the impression of pocket infection, ICD lead extraction was performed. The ICD lead was completely removed by percutaneous femoral approach with baseket snare.
폴리머코어 게이트 크기 변화가 두께 방향 수축률에 미치는 영향에 대한 연구
최한솔,정의철,박준수,김미애,채보혜,김상윤,김용대,윤경환,이성희,Choi, Han-Sol,Jeong, Eui-Chul,Park, Jun-Soo,Kim, Mi-Ae,Chae, Bo-Hye,Kim, Sang-Yun,Kim, Yong-Dae,Yoon, Kyung-Hwan,Lee, Sung-Hee 한국금형공학회 2020 한국금형공학회지 Vol.14 No.1
In this study, the variation of the shrinkage in the thickness direction of the molded parts according to the gate size of the polymer core fabricated through the 3D printer using the SLS method was studied. The polymer cores are laser sintered and the powder material is nylon base PA2200. The polymer cores have lower heat transfer rate and rigidity than the metal core due to the characteristics of the material. Therefore, the injection molding test conditions are set to minimize the deformation of the core during the injection process. The resin used in the injection molding test is a PP material. The packing condition was set to 80, 90 and 100% of the maximum injection pressure for each gate size. The runner diameter used was ∅3mm, and the gates were fabricated in semicircle shapes with cross sections 1, 2, and 3 ㎟, respectively. Thickness measurement was performed for 10 points at 2.5 mm intervals from the point 2.5 mm away from the gate, and the shrinkage to thickness was measured for each point. The shrinkage rate according to the gate size tends to decrease as the cross-sectional area decreases as the maximum injection pressure increases. The average thickness shrinkage rate was close to 0% when the packing pressure was 90% for the gate area of 1mm2. When the holding pressure was set to 100%, the shrinkage was found to decrease by 3% from the standard dimension due to the over-packing phenomenon. Therefore, the smaller the gate, the more closely the molded dimensions can be molded due to the high pressure generation. It was confirmed that precise packing process control is necessary because over-packing phenomenon may occur.