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파라계 아라미드 섬유의 열처리에 따른 구조, 물성 상관관계
최진욱,지민호,이민호,이진수,백두현,Choi, Jin-Uk,Jee, Min-Ho,Lee, Min-Ho,Lee, Jin-Soo,Baik, Doo-Hyun 한국섬유공학회 2010 한국섬유공학회지 Vol.47 No.1
The structure-property relation of para-aramid fibers heat-treated under various conditions was investigated. The effect of heat-treatment on the mechanical properties of the fibers was also studied. Tensile strength and strain at break decreased and tensile modulus increased with increasing heat-treatment temperature. Tensile modulus also increased with increasing draw ratio. Structural characterization was carried out by using wide angle X-ray scattering (WAXS) method. Both the apparent crystal sizes (ACS) measured from the broadening of reflection peaks of (004), (110) and (200) planes and the orientation angle obtained from azimuthal scan along the (200) direction were found to increase with increasing heat-treatment temperature and draw ratio.
임플랜트 지대주 나사의 텅스텐 카바이드/탄소 코팅이 전하중에 미치는 영향에 관한 연구
최진욱,정창모,전영찬,임장섭,정희찬,엄태관,Choi Jin-Uk,Jeong Chang-Mo,Jeon Young-Chan,Lim Jang-Seop,Jeong Hee-Chan,Eom Tae-Gwan 대한치과보철학회 2006 대한치과보철학회지 Vol.44 No.2
Statement of problem: In order to increase preload with reducing the friction coefficient, abutment screws coated with pure gold and Teflon as dry lubricant coatings have been introduced. But the reported data indicate that if screw repeated tightening and loosening cycle, an efficiency of increasing preload was decreased by screw surface wearing off. Purpose: This study was to evaluate the influence of tungsten carbide/carbon coating, which has superior hardness and frictional wear resistance, on the preload of abutment screws and the stability of coating surface after repeated closures. Material and method: The rotational values of abutment screws and the compressive forces between abutment and fixture were measured in implant systems with three different joint connections, one external butt joint and two internal cones. Moreover the stability and the alteration of coating surface were examined by comparison of the compressive force and the removable torque values during 10 consecutive trials, observation with scanning electron microscope and analyzed the elemental composition with energy dispersive x-ray spectroscopy Results and conclusion: 1. Application of coating resulted in significant increase of compressive force in all implant systems(P<.05). The increasing rate of compressive force by coating in external butt joint was gloater than those in internal cones (P<.05). 2. Coated screw showed the significant additional rotation compared to non-coated screw in all implant systems (P<.05). There were no significant differences in the increasing rate of rotation among implant systems (P>.05). 3. Removable torque values were greater with non-coated screw than that with coated screw (P<.05). 4. Coated screw showed insignificant variations in the compressive forces during 10 consecutive trials(P>.05) 5. After repeated trials, the surface layer of coated screw was maintained relatively well. However surface wearing and irregular titanium fragments were found in non-coated screw.
폴리에틸렌글리콜의 분자량이 공중합 폴리에스터의 열적 특성 및 알칼리 가수분해에 미치는 영향
김영준,지민호,이은희,최진욱,노동현,노환권,백두현,Kim, Young-June,Jee, Min-Ho,Lee, Eun-Hee,Choi, Jin-Uk,Noh, Dong-Hyun,Rho, Hwan-Kwon,Baik, Doo-Hyun 한국섬유공학회 2012 한국섬유공학회지 Vol.49 No.1
Copolyesters containing sodium sulfonate group and poly(ethylene glycol) (PEG) were synthesized with various molecular weight of PEG. The selected molecular weights of PEG were 1000, 2000, 4000, 6000, and 16000. The thermal properties and the crystallization behaviors of the copolyesters were investigated by using differential scanning calorimeter (DSC). Alkaline hydrolysis of the copolyesters was studied as a function of the treatment time. The melting temperatures and the heats of fusion of the copolyesters increased with an increase in the PEG molecular weight, while the weight reduction rate of copolyesters in an alkaline solution decreased with an increase in the PEG molecular weight. At the same PEG content in copolyesters, hard segment length increases with the PEG molecular weight, which was thought to be the most important factor that determines the thermal properties and the alkaline hydrolysis behavior.
이경환(Kyung Hwan Lee),최진욱(Jin Uk Choi),김창은(Chang Eun Kim) 한국경영과학회 2010 한국경영과학회 학술대회논문집 Vol.2010 No.6
In an industrial Era, OJT(On the Job Training) has been accepted as the field learning. But in a breaking up era, traditional field training needs to change and make an evolutionary model. Also, we need to make evolutionary model for various changing ways and means and need means to maximize the transformation of learning by operation learning organization. In knowledge based society, as people work and learn new knowledge in order to pass the experience knowledge and capabilities, they are not the traditional relationship between trainer and trainee but maximize work and learning, development and performance through several different ways. so, the study about new learning model is needed because the learning is creating the value and makes low cost and high efficiency about the elements of cost and time. We study the evolutionary model, OJF(On the Job Facilitating) - new learning methodology ? through operating learning organization in S Electronics and its application practices
이경환(Kyung Hwan Lee),최진욱(Jin Uk Choi),김창은(Chang Eun Kim) 대한산업공학회 2010 대한산업공학회 춘계학술대회논문집 Vol.2010 No.6
In an industrial Era, OJT(On the Job Training) has been accepted as the field learning. But in a breaking up era, traditional field training needs to change and make an evolutionary model. Also, we need to make evolutionary model for various changing ways and means and need means to maximize the transformation of learning by operation learning organization. In knowledge based society, as people work and learn new knowledge in order to pass the experience knowledge and capabilities, they are not the traditional relationship between trainer and trainee but maximize work and learning, development and performance through several different ways. so, the study about new learning model is needed because the learning is creating the value and makes low cost and high efficiency about the elements of cost and time. We study the evolutionary model, OJF(On the Job Facilitating) - new learning methodology ? through operating learning organization in S Electronics and its application practices