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R290/R32, R290/DME 적용 소프트 아이스크림 제조기
박태균(Park T-K),한성필(Han S-P),함정호(Ham J-H),김내현(Kim N-H),박형채(Park H-C) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.6
Drop-in tests were conducted using R290/R32 (31:69) or R290/DME (65:35) mixture in a ice-cream maker for possible replacement of R-502 and R-404A. At the standard room temperature (20℃), the time required for initial ice-cream making was 4’ 7” for R290/32, 4’ 39” for R404A and 4’ 59” for R290/DME. The electric energy consumed was 436 kJ for R290/32, 425 kJ for R404A and 439 kJ for R290/DME. The mass flow rate as well as the temperature and pressure data are also provided.
한성필(S.-P. Han),박태균(T.-K. Park),김내현(N.-H. Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Thermal performance analysis was conducted for the cross-flow enthalpy heat exchanger. Appropriate heat transfer coefficient and friction factor equations for laminar channel flow were selected, and the heat exchanger was analyzed using the unmixed cross-flow ε-NTU relationship. It is shown that the simple approach reasonably predict the available heat transfer and the pressure drop data. Additional issues on the entrance length, fin efficiency, mass transfer through the membrane paper are discussed.
이응렬(E.-R. Lee),박태균(T.-K. Park),신태룡(T.-R. Shin),김내현(N.-H. Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
The effect of oil on the flow boiling of R-123 in enhanced tube bundles was experimentally investigated. Three different tube bundles having different pore diameters were tested. The effect of mass flux, quality and heat flux were also investigated. It is shown that even a small amount of oil significantly reduced the heat transfer coefficient. The effect of heat flux on the reduction of heat transfer coefficient was significant. The reduction increased as the heat flux decreased. The effect of pore diameter was significant at a high heat flux. Largest reduction was observed for the tube where the heat transfer coefficient was the largest. The data are compared with the pool boiling counterpart.
정경희(G. Jeong),이혜준(H. J. Lee),최승희(S. H. Choi),박태균(T. Park),차민경(M. Cha),박상수(S. Park) 한국재활복지공학회 2017 한국재활복지공학회 학술대회논문집 Vol.2017 No.4
We investigated and analyzed medical device advertisements via mobile phone. Mobile phone apps in Google playstore, searched with 7 keywords: medical device, medical device shopping, hearing aids, contact lens, sphygmomanometer, glucose meter, and positive airway pressure unit. The apps were investigated as to whether they abide by the legal regulations related to medical device advertisement by MFDS. Many cases of false or exaggerated advertisement in mobile phone apps were identified. It is warranted that medical device advertising regulations needs to be expanded to cover the advertisement via mobile phone apps.
우 난포란의 (卵胞卵) 체외성숙에 관한 연구 Ⅰ. 난포란의 회수 및 체외배양
윤산현(S . H . Yoon),고대환(D . H . Ko),박세필(S . P . Park),박태균(T . G . Park),정길생(K . S . Chung) 한국축산학회 1989 한국축산학회지 Vol.31 No.4
These experiments were carried out to develop the effective recovering method of ovarian follicular oocytes and to investigate the optimum culture conditions for in vitro maturation of recovered follicular oocytes. Bovine follicular oocytes with various configurations of cumulus cell mass were collected by aspirating follicular fluid from the ovarian follicles of various size, and then cultured in various media for 28h in a incubator with 5% C0₂ in air at 38℃. The results obtained in these experiments were summarized as follow: 1. The average number of the follicular oocytes recovered from a cow was 46.4 and the highest recovery rate was obtained from middle size follicles, 3-5㎜ in diameter. 2. The majority of the follicular oocytes with compacted cumulus cells existed in GV stage While those with dispersed cumulus cells or without cumulus cells existed between GVBD and MⅡ stage. 3. The extrusion rate of Ist polar body of the follicular oocytes cultured in Ham`s F-10, m-KRB and BMOC-3 containing hormones was not higher than those of oocytes cultured in those media without hormones. However, in case of m-TALP medium, the highest extrusion rate of Ist polar body, 77.7% was obtained by adding hormones such as FSH, HCG and Estradiol. 4. The maturation rate of the follicular oocytes cultured in basic medium without or with matured cumulus cell was 40% or 51.1%, respectively, with significant difference(p$lt;0.05).