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조동우,Cho, D.W. 대한설비공학회 1999 설비공학 논문집 Vol.11 No.1
In this study, three different supply diffuser types(desktop, floor and ceiling) are compared in view of their ability to distribute supply air to the workstation breathing zone. The measurements on the age of air and the air change effectiveness using the tracer gas method are carried out to analyze the ventilation performance for provision of fresh air between the diffusers. The desktop diffuser type could deliver air directly to the occupants breathing zone with a high degree of effectiveness. The measured local air change effectiveness of the desktop diffuser in the breathing zone was usually 1.13 to 1.23 times greater than that of ceiling and floor diffusers. When the minimum outside air change rate as specified using ASHRAE Standard 62R is supplied with a desktop diffuser type, the volume of outside air can be reduced 13 to 23%, resulting in a commensurate in ventilation energy use.
J. S. Kong(공정식),K. Min(민경현),J. Kim(김종민),J. Kim(김지수),G. Gao(가오그),H. Park(박효신),H. H. Han(한현호),D.-W. Cho(조동우) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
To treat peripheral nerve deficits, a variety of synthetic and decellularized materials with anisotropic architectures are developed due to the advantages proposed by aligned structures with respect to cell activity, migration, and directionality. Additionally, narrowing microscale topological cue has advantages on alignment and migration of cells. However, up to date, fabricating 3D hydrogel constructs composed of thin microfibers under 50 μm using mechanically weak hydrogel like low concentrated dECM bioink is challenge, unlike synthetic polymer-based fabrication. In this study, we created a microgel printing bath solution to three-dimensionally print a dECM bioink, derived from porcine nerve, as a thin microfiber. A 30 μm filament resolution of low viscosity dECM hydrogel with a neutral pH was achieved using an alginate microgel supplemented printing bath. To treat the sciatic nerve defect model of rats, 3D printed cylindrical constructs retaining bundle of dECM microfibers were used as a filler of the polycaprolacton (PCL) conduit. The total number of regenerated axons and relative gastrocnemius muscle weight ratio were comparable to those of the autologous nerve graft group. Meanwhile, the results were superior to those of the porcine decellularized nerve tissue group or the 3D printed filler only group.