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Polydimethylsiloxane 계 촉진수송 산소부화막의 제조 및 그 투과 특성
심정섭,김은영,강용수,김병기,홍재민 ( Jyong Sup Shim,Un Young Kim,Yong Soo Kang,Byung Gi Kim,Jae Min Hong ) 한국공업화학회 1990 공업화학 Vol.1 No.2
Polydimethylsiloxane(PDMS) containing [N, N`-bis (3- (salicylidene amino) propyl) amine Co(II)〕(Co(saldpt)) as a fixed oxygen carrier was synthesized. UV-visible spectra of the membrane demonstrated that Co(saldpt) binded molecular oxygen specificaaly and reversibly. From time lag method experiment, it was found that both oxygen permeability and diffusibity increase with decreasing upstream pressure, while solubility maintain nearly constant. The maximum oxygen permeability and oxygen selectivity over nitrogen obtained was 18.6 barrer and 4, respectively, at 25 mmHg and 40℃ from the PDMS membrane containing 1 wt% of Co(saldpt). Facilitation behavior was explained in terms of the dual sorption model.
In-Vitro, In-Vivo 동물모델에서 귀리 유래 수용성 베타-글루칸의 칼로리 제한 효과 작용기전 규명
강한나 ( Hanna Kang ),김세찬 ( Se-chan Kim ),강용수 ( Yong Soo Kang ),권영인 ( Young-in Kwon ) 한국식품영양학회 2017 韓國食品營養學會誌 Vol.30 No.6
In the current study, we investigated the inhibitory activity of water soluble β-glucan from oat (Avena sativa) against various digestive enzymes such as α-glucosidase, sucrase, maltase and glucoamylase. Inhibition of these enzymes involved in the absorption of disaccharide can significantly decrease the post-prandial increase of blood glucose level after a mixed carbohydrate diet. The β-glucan had the highest documented rate of small intestinal sucrase inhibitory activity (2.83 mg/mL, IC<sub>50</sub>) relevant for potentially managing post-prandial hyperglycemia. Furthermore, we evaluated the effects of β-glucan on the level of post-prandial blood glucose in animal model. The post-prandial blood glucose levels were tested two hours after sucrose/starch administration, with and without β- glucan (100, and 500 mg/kg-body weight). The maximum blood glucose levels (Cmax) of β-glucan administration group were decreased by about 23% (from 219.06±27.82 to 190.44±13.18, p<0.05) and 10% (from 182.44±13.77 to 165.64±10.59, p<0.01) in starch and sucrose loading test, respectively, when compared to control in pharmacodynamics study. The β -Glucan administration significantly lowered the mean, maximum, and minimum level of post-prandial blood glucose at 30 min after meal. In view of the foregoing, it is felt that our findings suggest that β-glucan from oat serves to reduce post-prandial blood glucose rise secondary to slower absorption of glucose in the small intestine, via carbohydrate hydrolyzing enzymes inhibition.
김선영(Kim, Sun-Young),전라선(Jeon, La-Sun),이용건(Lee, Yong-Gun),강용수(Kang, Yong-Soo) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.11
Supramolecules containing double hydrogen bonding sites at their both chain ends were self-polymerized to become solid state polymer and were utilized to improve the efficiency of solid state DSSCs. Hydrogen bonding sites were attached at the chain ends of PEG of Mw=2000, such as pyrimethamine and glutaric acid. The solar cell with the solid state supramolecular polymer electrolyte resulted in the overall energy conversion efficiency of 4.63 % with a short circuit current density (J_{sc}) of 10.41 mAcm^{-2}, an open circuit voltage V_{oc}, of 0.71 V and a fill factor (FF) of 0.62 at one sun condition ([oligomer]:[1-methyl-3-propyl imidazolium iodide (MPII)]:[I₂] = 20 : 1 : 0.19, active area = 0.16 cm², TiO₂ layer thickness = 10 {mu}m). The ionic conductivity of the sol id state electrolyte was 5.11{times}10^{-4} (S/cm). The cell performance was characterized by electrochemical impedance spectroscopy and ionic conductivity.
염료감응형 태양전지에서의 고분자 전해질 종류에 따른 이온전도도와의 상호관계
차시영(Cha, Si-Young),김수진(Kim, Su-Jin),이용건(Lee, Yong-Gun),강용수(Kang, Yong-Soo) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.11
Poly(ethylene glycol) dimethyl ether (PEGDME)/fumed silica/ 1-methyl -3-propylimidazolium iodide (MPII)/I₂ mixtures were used as polymer electrolytes in solid state dye-sensitized solar cells (DSSCs). The contents of MPII were changed and the concentration of I₂ was fixed at 0.1 mole% with respect to the MPII. The maximum ionic conductivity was obtained at [EG]:[MPII]:[I₂]=10:1.5:0.15. It was supposed that the maximum of ionic conductivities would match with that of cell efficiencies, if the ionic conductivity is a rate determining step in the sol id state DSSCs. However, the maximum composition did not show the maximum solar cell performance, indicating the mismatch between ionic conductivity and cell performance. This suggests that the ionic conductivity may not be the rate controlling step in determining the cell efficiency in these experimental conditions, whereas other parameters such as the electron recombination might play an important role. Thus, we tried to modify the surface of the TiO₂ particles by coating a thin metal oxide such as Al₂O₃ or Nb₂O<sub>5</sub> layer to prevent electron recombination. As a result, the maximum of the cell efficiency was shifted to that of the ionic conductivity. The peak shifts were also attempted to be explained by the diffusion coefficient and the lifetime of electrons in the TiO₂ layer.
연구논문 : 마카 열수추출물 첨가가 요구르트의 품질 및 항산화능에 미치는 영향
정해정 ( Hai Jung Chung ),추영란 ( Young Ran Chu ),박한나 ( Han Na Park ),전인숙 ( In Sook Jeon ),강용수 ( Yong Soo Kang ) 한국식생활문화학회 2010 韓國食生活文化學會誌 Vol.25 No.3
The objective of this study was to examine the quality characteristics and antioxidant activity of yogurt containing hot water extract from maca. Four different levels (0, 4, 8, 12%) of maca extract were added to milk followed by fermentation with lactic acid bacteria at 37℃ for 12 hrs, and then the physicochemical properties of the samples were investigated. During 7 days of storage at 4±1℃, the acid production (pH and titratable acidity) of the yogurt increased with the addition of maca extract. The Hunter L value (lightness) decreased, while the b value (yellowness) increased as the maca extract level in the yogurt increased. Viable cell counts were not significantly different among the samples. The results of consumer acceptance tests showed that no significant differences in overall acceptability were observed between the yogurts containing 4% and 8% of maca extract and a control yogurt. The yogurt containing maca extract exhibited higher DPPH radical and superoxide anion radical scavenging activities than the control yogurt over the storage period.
개발 강화제 처리 전후의 암석 표면에 나타나는 특성 변화 연구
김정진 ( Jeong Jin Kim ),장윤득 ( Yun Deuk Jang ),원종옥 ( Jong Ok Won ),강용수 ( Young Soo Kang ) 한국광물학회 2012 광물과 암석 (J.Miner.Soc.Korea) Vol.25 No.2
강화제는 손상된 석조문화재를 보존하기 위해 널리 사용되고 있다. 본 연구에서는 기 개발된표면 강화제를 화강암, 사암, 대리암에 적용시킨 후 암석 광물학적 특성변화를 연구하기 위하여 개발된 강화제를 화강암, 대리암, 사암에 적용하여 강화제의 효율에 대한 현장평가를 실시하였다. 강화제현장 적용 대상암석에 대하여 X-선회절분석, 쌍안실체현미경, 편광현미경, 주사전자현미경 관찰 등을 실시하였으며, 본 연구에 사용한 강화제는 개발한 2종 100%1T1G, 3%40nm/97%1T1G이다. 개발 강화제 처리 후 암석 표면변화에 대한 연구 결과에 의한 효과는 화강암의 경우 3%40nm/97%1T1G가 아주우수하고, 사암의 경우 3%40nm/97%1T1G 약간 우수하며, 대리암의 경우 3%40nm/97%1T1G와 100%1T1G는 유사하다. 강화제 처리 전후의 특성은 각 강화제에 따라 다르며 향후 손상된 석조문화재에 강화제를 처리할 경우 이 연구 결과를 적용할 수 있을 것으로 생각된다. The consolidants have been widely used for the consolidation of decaying heritage stone surfaces. In this study, X-ray diffraction analysis, polarized and stereo-microscope and scanning electron microscope were used to study the surface characterization of granite, sandstone and marble, and to assess the efficiency and the effects of the developed condolidants in the field. The developed consolidants used in this experiment are 100%1T1G and 3%40nm/97%1T1G. The effects of consolidants are 3%40nm/97%1T1G >>100%1T1G in granite, 3%40nm/97%1T1G>100%1T1G in sandstone, and 3%40nm/97% 1T1G=100%1T1G in marble. The characteristics of rock surface when treated with consolidants show different result according to consolidantes type. This result of treating with consolidant can be used for the conservation of an decaying heritage stone.