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전기방사기법으로 제작된 인공지지체 내부의 확산현상 측정 및 시뮬레이션
이승열(SeungYoul Lee),이종완(Jongwan Lee),채상민(SangMin Chae),김성준(Seongjun Kim),정영훈(Young Hun Jeong),김중경(JungKyung Kim),진송완(Songwan Jin) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
In this study, we made line patterns of nanofiberous structures using electrospinning technique and alginate hydrogel and we measured local diffusion coefficient of 3 kDa FITC-dextran using the fluorescence recovery after photobleaching(FRAP) technique. As results of the FRAP measurements, we didn’t observe any significant differences in the diffusivity among the samples. Calculated diffusivity of the electrospun line patterns and alginate hydrogel based on the measured oxygen diffusivity appeared to be about 92?94% as compared with the oxygen diffusivity in water. We also conducted the simulation of oxygen diffusion phenomena within the 3D model scaffold which is consisted that oxygen permeable line structures scaffold and solid scaffold with various oxygen diffusivity.
실내 온열환경에 따른 재실자의 창개폐 환기시점에 관한 연구
한화택(Hwataik Han),이준용(Junyong Lee),신철용(Cheolyong Shin),장경진(Kyung-Jin Jang),김중경(JungKyung Kim),임시형(Si-Hyung Lim) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
Building ventilation is required to provide fresh outdoor air for occupant health and comfort. The ventilation airflow is often controlled rigidly to maintain constant temperature and concentrations, which may cause unnecessary ventilation. It is the objective of the present study to investigate the window open/close behavior and needs of ventilation by occupants depending on thermal environment in naturally ventilated space. Preliminary experiments have been conducted to correlate physical environmental quantities such as temperature and CO₂ concentration with respect to window use and number of occupants. Simple models for window operation are proposed based on experimental data. Energy efficient integrated ventilation control technologies can be developed based on the occupant behavior model in addition to physical environmental conditions.