http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
손달호,사공혜숙,임준식 한국의사결정학회 1998 경영과학연구 Vol.7 No.-
This study is carried out as the efforts to analyze the critical factors in the design of the electronic payment system From the stand point of the users and merchants, not only the critical factors of an electronic payment system that is convenient and reliable to more efficient and secure design, but also the barrier factors involved such as the level of the transaction, product, information and technology has not been proved empirically. The purpose of this study is to present a model and test factors that influence the design of an electronic payment system. In the case of the actual purchase through the internet, the security issue must be resolved in the design of a payment system. The users are not confident about dealing with the transaction on the web. The main contribution of this study is to present a model for design of an electronic payment system and to offer the critical success factors in the design of the electronic payment system.
자동차차체 및 부품제조업 산업장의 작업환경실태에 관한 조사 연구
서준호,문덕환,김정호,이채관,황용식,손병철,김대환,이창희,김휘동,이채언 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.5
Objectives: For the purpose of preparing the fundamental data and control the working environment and assessing the status of working environmental in manufacturing industry of bodies for motor car and of parts. Methods and Materials: Accessories for motor car and its engines the auther measured the noise level, concentration of dust, heavymetals, organic solvents, chemicals to 99 industries(24 working processes) form Feb. 2000 to Oec. 2000. Results: The results were as follows : 1. Mean noise level cutting, grinding, pressing, foundries and shot-blast was exceeded to threshold limit value(TLV) of noise. 2. Mean concentration of total dust was not exceeded to TLV. 3. Mean concentration of Mn in welding process and Pb in drying, welding, fabricating, rolling was exceeded to TLV. 4. Mean concentration for chemicals and organic solvents were not exceeded to TLV. 5. Mean concentration of dust and heavymetals were statistical significant difference between with local ventilation system and without local ventilation system. Conclusion: Above results, author suggest to prepare more passively control to working environment where exceeded the TLV.
고속방사에 의해 제조된 PEN 필라멘트의 특성 : 방사속도에 따른 영향 Effects of Take-up Velocities
지동선,손준식 단국대학교 2001 산업기술연구 Vol.2 No.-
Polyethylene 2,6-naphthalate(PEN) filament by high-speed melt spinning was prepared at the take-up velocities of 1∼7 ㎞/min. The changes of the structure and physical properties caused by various take-up velocities were studied by measuring density, birefringence, x-ray diffraction, DSC, and tensile behavior. The PEN filament at high take-up velocities were show very different structure formation and properties. The orientation, especially in crystalline phase, was developed with the increase of take-up velocity. The physical properties(i.e. density, crystallinity, birefringence melting temperature, heat of fusion, tensile strength, tensile modulus)of the PEN filaments were increased with increasing of take-up velocities. These increasing tendencies were markedly appeared at the take-up velocities of 4∼7 ㎞/min by conditions due to suddenly orientation of shin molecules. The existence of extended non-crystalline molecules in the PEN filaments was appeared at take-up velocity about 4∼7 ㎞/min. It was found that they formed crystal at take-up velocity 7 ㎞/min, and their crystal
Son, Jun-Sik,Kim, Su-Gwan,Jin, Seung-Chan,Piao, Zheng-Gang,Lee, Sook-Young,Oh, Ji-Su,Kim, Chun-Sung,Kim, Byung-Hoon,Jeong, Mi-Ae Kluwer Academic Publishers 2012 Biotechnology letters. Vol.34 No.4
<P>A novel barrier membrane composed of poly(lactic-co-glycolic acid) particles loaded with dexamethasone (DEX) as a bioactive molecule was produced via a modified nanoprecipitation method without any mixing. The particle membranes had a bilayer structure: one side was smooth and had a compact surface that was connected to larger particles, while the opposite side was rough, porous and connected to smaller particles. Additionally, a cross-section of the particle membrane had a porous structure with nano and micro sized irregular pores. Process optimization revealed that NaCl concentration in the water phase, with acetone as solvent and water as a non-solvent, played critical roles in determining the properties of the particle membranes, such as DEX encapsulation efficiency, thickness and surface morphologies of the particle membranes. A novel barrier membrane containing DEX using polymer particle drug capture technology has been successfully developed.</P>
Synthesis and Hydrophilicities of Poly(ethylene 2,6-naphthalate)/ Poly(ethylene glycol) Copolymers
Son, Jun-Sik,Ji, Dong-Sun The Korean Fiber Society 2003 Fibers and polymers Vol.4 No.4
Poly(ethylene 2,6-naphthalate) (PEN)/Poly(ethylene glycol) (PEG) copolymers were synthesized by two step reaction during the melt copolymerization process. The first step was the esterification reaction of dimethyl-2,6-naphthalenedicarbox-ylate (2,6-NDC) and ethylene glycol (EG). The second step was the condensation polymerization of bishydroxyethylnaphthalate (BHEN) and PEG. The copolymers contained 10 mol% of PEG units with different molecular weights. Structures and thermal properties of the copolymers were studied by using $^1{H-NMR}$, DSC, TGA, etc. Especially, while the intrinsic viscosities of PEN/PEG copolymers increased with increasing molecular weights of PEG, but the glass transition temperature, the cold crystallization temperature, and the weight loss temperature of the copolymers decreased with increasing molecular weights of PEG. Consequently, the hydrophilicities by means of contact angle measurement and moisture content of the copolymer films were found to be significantly improved with increasing molecular weights of PEG.
Effects of chemical and physical defects on the humidity sensitivity of graphene surface
Son, Young Jun,Chun, Kyoung-Yong,Kim, Jun-Sik,Lee, Jong-Heun,Han, Chang-Soo North Holland 2017 Chemical physics letters Vol.689 No.-
<P>We investigate the effect of the chemical and physical defects on the humidity sensitivity of graphene. For this we apply reactive ion etching for physical defects and the poly(methyl methacrylate) (PMMA) coating for chemical defects to the CVD graphene. The tendency of humidity sensing is hardly found by the physical defects while the distinct changes are observed with chemical defects by control of the thickness and the coverage area of the PMMA on the graphene surface. The graphenes covered with thinner or smaller area of PMMA show an enhanced humidity sensitivity, indicating the possibility of H2O sensing. (C) 2017 Elsevier B.V. All rights reserved.</P>
Son, Jun Sik,Kwon, Tae-yub,Kim, Kyo-han American Scientific Publishers 2015 Journal of Nanoscience and Nanotechnology Vol.15 No.1
<P>Novel porous biphasic calcium phosphate (BCP) granules incorporated with drug-releasing poly(lactic-co-glycolic acid) (PLGA) nanoparticles were developed as a drug delivery platform for bone regeneration. The charge interaction between the BCP and PLGA nanoparticle surfaces was manipulated to create this combination system. Spherical BCP granules with open micro-channels and PLGA nanoparticles loaded with dexamethasone (DEX) as a model drug were fabricated using a liquid nitrogen method and standard emulsion method, respectively. Polyethyleneimine was coated on the DEX-loaded PLGA nanoparticle surfaces, resulting in a net positively charged surface. Such modified nanoparticles were immobilized physically on the negatively charged BCP granule surfaces. An in vitro evaluation of MG 63 cells cultured for 1 and 2 weeks on the BCP granules containing DEX-loaded PLGA nanoparticles showed greater cell proliferation, differentiation, and a more extensively connected-tissue network than those cultured on the BCP granules alone. This innovative platform for bioactive molecule delivery more potently induced osteogenesis in vitro, which might be exploited in implantable bioceramic bone graft materials for stem cell therapy or improved in vivo performance.</P>