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박현상,이혁진,김헌 明知大學校 産業技術硏究所 2000 産業技術硏究所論文集 Vol.19 No.-
This study presents the analysis for a greenhouse using Runge-Kutta methods. The energy balance equations are formulated, considering the effects of evaporation from the plant, conduction through the ground, ventilation, etc. It is observed that there is significant reductions of plant and room air temperature due to an increase in number of air change, the heat capacity of plants and the movable insulation.
Park, Su Hyung,Lee, Yun Jung,Lim, Min Jin,Kim, Eun Jung,Lee, Jang Hern,Han, Ho Jae Wiley Subscription Services, Inc., A Wiley Company 2004 Journal of cellular physiology Vol.200 No.3
<P>The precise signal that regulates fructose transport in renal proximal tubule cells (PTCs) under high glucose conditions is not yet known although fructose has been recommended as a substitute for glucose in the diets of diabetic people. Thus, we investigated that effect of high glucose on fructose uptake and its signaling pathways in primary cultured rabbit renal PTCs. Glucose inhibited the fructose uptake in a time- and dose-dependent manner. A maximal inhibitory effect of glucose on fructose uptake was observed at 25 mM glucose after 48 h, while 25 mM mannitol and l-glucose did not affect fructose uptake. Indeed, 25 mM glucose for 48 h decreased GLUT5 protein level. Thus, the treatment of 25 mM glucose for 48 h was used for this study. Glucose-induced (25 mM) inhibition of fructose uptake was blocked by pertussis toxin (PTX), SQ-22536 (an adenylate cyclase inhibitor), and myristoylated amide 14–22 (a protein kinase A inhibitor). Indeed, 25 mM glucose increased the intracellular cAMP content. Furthermore, 25 mM glucose-induced inhibition of fructose uptake was prevented by neomycin or U-73122 (phospholipase C inhibitors) and staurosporine or bisindolylmaleimide I (protein kinase C inhibitors). In fact, 25 mM glucose increased the total PKC activity and translocation of PKC from the cytosolic to membrane fraction. In addition, PD 98059 (a p44/42 mitogen-activated protein kinase (MAPK) inhibitor) but not SB 203580 (a p38 MAPK inhibitor) and mepacrine or AACOCF<SUB>3</SUB> (phospholipase A<SUB>2</SUB> inhibitors) blocked 25 mM glucose-induced inhibition of fructose uptake. Results of Western blotting using the p44/42 MAPK and GLUT5 antibodies were consistent with the results of uptake experiments. In conclusion, high glucose inhibits the fructose uptake through cAMP, PLC/PKC, p44/42 MAPK, and cytosolic phospholipase A<SUB>2</SUB> (cPLA<SUB>2</SUB>) pathways in the PTCs. © 2004 Wiley-Liss, Inc.</P>
전선이중피복용 동심압출 die 내의 고분자 물질의 이동현상에 관한 유변학적 해석
박헌진,이기준,박용민 한국화학공학회 1990 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.28 No.6
LDPE와 PS를 피복물질로 사용하는 전선이중피복 공정에서 동심압출 전선피복 die내에서의 고분자 물질의 유동현상을 Newtonian fluid model과 Carreau modes을 사용하여 유한요소법으로 수치해석하였다. 피복물질의 상대적 위치의 바뀜과 조업조건의 변화가 유동장에 미치는 효과를 조사하였으며 고분자 물질의 점성분산에 의한 온도상승을 고려하기 위해서 비등온 해석을 수행하였다. 계면의 위치는 점도가 작은 LDPE가 외층 피복물질로 쓰였을 경우에 die의 외벽 쪽으로 더 접근함을 알 수 있었으며, die내의 전체 압력강하는 점도가 큰 PS가 외층을 이룰 때가 LDPE가 외층을 이루는 경우보다 2배 정도 컸으며 각각 전선속도의 0.40, 0.45승에 비례하여 증가하였다. Die내에서의 최고온도 상승은 충격점 부근의 전선표 면에서 생겼으며 이는 전선속도가 증가할수록, 점도가 큰 물질이 전선과 접촉하고 있을수록 더 큰 값을 보였다. This study is to analyze the flow behavior of Newtonian and Carreau model fluids in a coextrusion wire coating die by finite element method. The effects of the change of the relative position of the coating materials and the operating conditions on the flow fields and investigated. A nonisothermal analysis is also carried out to take into account the temperature rise due to viscous dissipation. The interface is positioned closer to the outer die wall when the lower viscous component forms the outer layer. The total pressure drop for the PS/LDPE system is nearly twice as laege as that of the LDPE/PS system at the same wire velocity. The wall shear stress increases as the wire velocity increases and the PS/LDPE system has the larger value than the LDPE/PS system for both isothermal and nonisothermal conditions. The maximum temperature and the die exit temperature increase as the wire velocity increases. And the temperature rise due to viscous dissipation of molten polymer is higher when the higher viscous component forms the inner layer.
스테로이드 투여받는 흰쥐에서 Chromium 의 인슐린 감수성 개선 작용
박일규,김동선,안유헌,신현진,강주섭,최호순,이창범,박용수,김태화 대한당뇨병학회 2001 Diabetes and Metabolism Journal Vol.25 No.3
Background: Chromium (Cr) has been known to be essential for the regulation of insulin action. Recently it has been reported that corticosteroid increases urinary loss of Cr, and that Cr supplementation recovers steroid induced diabetes mellitus. Methods: Rats were daily treated with dexamethasone (0.2 mg/kg, ip) for first. 7 days and were further treated daily with dexamethasone plus either chromium picolinate (30 mg/kg) or a placebo for a period of 14 days. Results: At the end of experiment (Day 21), the control rats treated only with dexamethasone weighed 320 gram (80% of initial weight) in average, but the Cr treated rats weighed 364 gram (91 % of initial weight. p$lt;0.05). An insulin sensitivity test (subcutaneous injection of insulin (5 U/kg) plus intraperitoneal injection of glucose (30 minutes after insulin injection)) were conducted. During the insulin sensitivity tests, the area under curves (AUC_(0→120 mm min)) of the time-glucose concentrations curves in the Cr-treated group were decreased compared to those in the control group (5250 vs 15883 mg-min/dL, p$lt;0.01). Fasting serum insulin levels in the Cr-treated rats were clearly decreased by 46.9% compared to those in the control group (2.98 vs 5.60 ng/mL, p$lt;0.05). Conclusions: We conclude that chromium supplementation reverse a catabolic state, and increase insulin sensitivity in dexamethasone treated rats.
FRP-콘크리트 합성 압축재의 거동평가 및 예측에 관한 실험적 연구
박주경(Park, Ju-Kyung),곽경헌(Kwak, Kyung Hern),정태영(Chung, Tae-Young),김진수(Kim, Jin Soo) 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.2
In this thesis it is attempted to predict the compressive strength and the stress-strain relation of CFFT by using uniaxial compression tests. Before the test, physical, chemical, and mechanical properties of FRP are measured or determined by experiment and the existing documents relating to the study of CFFT has been collected and reviewed. From the research, prediction model for the strength and stress-strain relation of CFFT compression member is suggested. So, it is expected that the results could be used for the preliminary design of such structures or as a basic data for the future research.