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PTT 섬유의 염색성 (2)- 용제 처리한 PTT 섬유의 염색성 및 물성 -
이두환,정동석,김호정,이문철 한국염색가공학회 2003 韓國染色加工學會誌 Vol.15 No.4
Poly(trimethylene terephthalate)(PTT) fiber was pretreated with organic solvent/water solutions of various compositions. The organic solvents used in this experiment were benzyl alcohol, n-buthanol, and N,N-dimethylformamide(DMF). Density of the fibers were investigated as a measure of crystallite region. The dye uptake increased in the order of pretreatment with hot water < untreated < 5% benzyl alcohol < 100% benzyl alcohol < 90% benzyl alcohol; hot water < untreated ≒ 5% butanol < 100% butanol < 90% butanol; hot water ≒ 5% DMF < untreated < 90% DMF < 100% DMF. The dye uptake increases with increase of crystallinity. It seems likely that the recrystallization process during the pretreatment with organic solvent/water solutions leads to an increase in the microvoid and then a large increase in the dye uptake. Also the dyeing rate increased and the dyeing transition temperature decreased with the pretreatments. The results obtained are corresponds with the plasticization of the fiber structure formed during the pretreatment.
Enhanced Gene Delivery by Palmitic Acid-Conjugated Low Molecular Weight Polyethylenimine
이두환,김원종,Kaushik Singha,박주희,조성봉 한국고분자학회 2012 Macromolecular Research Vol.20 No.3
Palmitic acid-conjugated low molecular weight polyethylenimine (PEI-g-PEG-PA) was successfully synthesized to develop an efficient non-viral gene carrier. The judicious integration of hydrophobic palmitic acid and polyethylenimine via hydrophilic polyethylene glycol (PEG) facilitated the formation of nano-sized complex (nanoplex) with plasmid DNA (pDNA) which provided the protection of pDNA against the serumic enzymatic degradation. Furthermore, the delivery system demonstrated enhanced gene transfection efficiency in comparison to unmodified low molecular weight PEI without inducing any significant cytotoxicity.
이두환 동의대학교 경제경영전략연구소 2010 經濟經營硏究 Vol.5 No.2
This study analyzes the German family business and derives its implications for Korea. The major findings can be summarized as follows. The German family business has contributed to the national economic growth as an important economic agent, but faces significant challenges such as global management and using the technology fusion in business. The policy development for the improvement of the German family business is putting its emphasis on the restructuring the partnership and encouraging the Entrepreneurship. The German cases imply the strengthening the partnership between Prime and Subcontractors in Korean small business to develop the innovation activities. For this purpose the policy for small business could be formulated and implemented from the point of national strategies. In addition, by experiencing professional skills and jobs, education should connect all the more the classroom to the professional milieu. Finally vitalizing regional policies are definitely important for small business to shore up the local economy.