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Norfloxacin의 Polyvinylpyrrolidone, Polyethyleneglycol 및 Acrylic 중합체로 된 공침물의 용출특성
구영삼,최영욱,김종갑 중앙대학교 약학연구소 1991 약학 논총 Vol.5 No.-
This investigation was carried out to develop new proparation of antibacterial agent with controlled release properties. An antibacterial agent, norfloxacin, was coprecipitated with polyvinylpyrrolidone, polyethyleneglycol, and cationic or anionic acrylic copolymer, and the dissolution rates of them were examined in powder and disk state. The coprecipitates showed different dissolution rates according to dissolution medium. The coprecipitates produced with polyvinylpyrrolidone, and cationic or anionic acrylic copolymer showed decreased dissolution rates compare to free drug in artificial gastric juice, but the coprecipitate with polyethyleneglycol showed decreased or increased dissolution rates depending on the ratio. In artificial intestinal juice, the coprecipitates with polyvinylpyrrolidone showed decreased or increased dissolution rates depending on the ratio, and the coprecipitate with polythyleneglycol showed increasing aspect. However, dissolution rate of the coprecipitates with cationic acrylic copolymer was higher than that of the coprecipitate with anionic acrylic copolymer.
이성훈(Sunghoon Lee),구영삼(Youngsam Gu),신보성(Bosung Shin),최수길(Sukil Choi),이재용(Jeawong Yi),김광환(Kwanghwan Kim) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
This paper describes Kappa 1.0L 3-cylinder gasoline engine that Hyundai has developed for small cars lately. This engine has been installed in small passenger cars named “i10”, “All new morning” etc. since November 2010. These cars are sold in global market including Korea, Europe, etc. Newly developed Kappa 3-cylinder engine is achieved not only the best-in-class performance but also highly improved fuel economy at practical driving condition compared with existing engine for satisfying the customer’s need. It is developed for various fuels, such as LPi-Bi-Fuel and FFV. It copes with emission control regulations in many countries and achieves the best-in-class fuel economy, NVH performance and lightweight. Kappa that is an in-line 3 cylinder DOHC 12 valves engine with D-CVVT technology is new developed engine, differentiated from existing engine. Major items for technical highlights are as follows -Dual CVVT and VIS for improving performance -Dual CVVT, offset crankshaft, ISG and reduced number of cylinder from 4 to 3 for improving fuel economy -Applying a ladder frame for reinforcing the tightening stiffness between an engine and a transmission and mounting accessory parts on the engine directly for improving its stiffness. -Optimized catalyst jewelry loading and valve timing for coping with the strict emission control regulations -Timing chain for improving durability