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Poly(D-lactic acid-b-L-lactic acid)의 결정화거동 및 열적 특성
이경우,박흥수,김영호,Lee, Kyoung-Woo,Park, Heung-Su,Kim, Young-Ho 한국섬유공학회 2010 한국섬유공학회지 Vol.47 No.6
A stereocomplex of poly(lactic acid) (PLA) from the opposite enantiomeric configurations of the L and D forms has higher thermal resistance and mechanical properties than poly(L-lactic acid) (PLLA), which may overcome the problems with the low melting temperature of PLLA when used as a commercial fiber. In this study, the crystallization behavior and thermal properties of poly(D-lactic acid-b-L-lactic acid) (PDLLA) block copolymer (50:50, w/w) were characterized by differential scanning calorimetry (DSC), dynamic mechanical analysis, and wide angle X-ray diffraction (WAXD) analysis. DSC showed that the melting temperature of the stereocomplex crystal was approximately $215^{\circ}C$, which was much higher than that of homo PLLA (${\sim}168^{\circ}C$). The equilibrium melting temperature and stability parameter of PDLLA obtained from the Hoffman-Weeks plot was $230^{\circ}C$ and 0.44, respectively. Compared to the WAXD peaks of the ${\alpha}$-form crystal of PLLA, additional peaks were observed for PDLLA at $11.9^{\circ}$, $20.8^{\circ}$, and $23.6^{\circ}$ $2{\theta}$ arising from the D,L-stereocomplex crystal of PLA. The crystallization behaviors of PDLLA and PLLA during the heating and cooling processes from the melt-quenched state and from the molten state, respectively, were compared using the WAXD curves obtained from a synchrotron X-ray source. The effects of annealing of both PLLA and PDLLA films at different temperatures on the crystal formation were also examined.
펄스전착법과 첨가제를 사용하여 전착된 ULSI배선용 구리박막의 특성
이경우,양성훈,이석형,신창희,박종완,Lee Kyoung-Woo,Yang Sung-Hoon,Lee Seoghyeong,Shin Chang-Hee,Park Jong-Wan 한국전기화학회 1999 한국전기화학회지 Vol.2 No.4
펄스전착법에 의한 구리박막의 특성과 via hole 충진 특성을 연구하였다. 특히 구리박막의 특성에 미치는 첨가제의 영향을 중점적으로 다루었다. 펄스 전류와 첨가제를 사용하여 전착한 구리박막은 83.4 MPa이하의 낮은 인장응력을 가졌으며 높은 Cu (111) 우선 배향성을 나타냈다. Superfilling에 의해 최고 $0.25{\mu}m, 6: 1$ 정도의 고 종횡비를 가지는 via hole에 결함 없이 성공적으로 충진할 수 있었으며 미세 구조를 관찰한 결과 쌍정에 의한 변형이 일어났음을 알 수 있었다. $500^{\circ}C$에서 1시간 동안 진공열처리를 했을 경우 두께의 $1\~2$배에 달하는 결정립을 가지는 bamboo구조를 나타냈으며 이때 전기비저항은 $1.8\~2.0{\mu}{\Omega}{\cdot}cm$을 나타냈다. The characteristics of copper thin films and via hole filling capability were investigated by pulsed electrodeposition method. Especially, the effects of additives on the properties of copper thin films were studied. Copper films, which were deposited by pulsed electrodeposition using commercial additives, had low tensile stress value under 83.4 MPa and high preferred Cu (111) texture. Via holes with $0.25{\mu}m$ in diameter and 6 : 1 aspect ratio were successfully filled without any defects by superfilling. It was observed that copper microstructure deformed by twining. After heat treatment at $500^{\circ}C$ for 1 k in vacuum furnace, grain size was 1 or 2 times as large as film thickness and the bamboo structure was formed. Heat treated copper films showed good resistivities of $1.8\~2.0{\mu}{\Omega}{\cdot}cm$.
이경우(Kyoung Woo Lee),류성민(Sungmin Ryu) 한국경영학회 2014 Korea Business Review Vol.18 No.4
본 논문은 SPC의 공유가치 창출(Creating Shared Value, CSV)사례 분석을 통해 기업과 사회의 상생을 기반으로 한 동반성장 확산에 시사점을 제공하고자 한다. 사회적 책임(Corporate Social Responsibility, CSR)과의 개념적 차이를 바탕으로 프랜차이즈 산업의 공유가치 창출방법과 사회적 영향력 분석을 통해 SPC 사례를 살펴보았다. SPC는 산학협력을 통한 제품 개발, 생산농가와의 상생, 소외계층 자립 지원을 통한 CSV활동을 활발하게 진행 중에 있는 것으로 나타났다. 이와 함께 사례 일부에서는 지속적인 사회적 가치창출과 기업의 경쟁력 강화, 소비자 역할의 중요성 인지 확대, 그리고 프랜차이즈 관계에서 현재의 CSV활동을 개선할 여지가 있는 것으로 나타났다. 본 연구 결과는 기업의 가치 창출 기능의 올바른 이해와 기업과 사회가 협력하여 함께 발전하는 공유가치창출 문화의 형성 및 확산에 공헌할 것으로 기대된다. This article aims to provide implications for encouragement of accompanied growth based on coexistence of firms and society by analyzing SPC’s Creating Shared Value(CSV) case. We evaluate SPC case through ways of creating shared value in franchise industry, based on distinct conceptual difference with Corporate Social Responsibility(CSR), and Social Impact Analysis. The findings revealed three types of CSV cases: new product development through university-business cooperation, accompanied growth with local farms, and support independent living for disadvantaged people. They also suggested that there still exists areas for improvement in four ways: sustainable social value creation, reinforcement of corporate competitiveness, interaction with consumer, franchise relationship. This study contribute to proper understanding of business in terms of creating value, and encouraging CSV in our society.
이경우(Kyoung-woo Lee),송영수(Young-Soo Song),원종범(Jong-bum Won),류경부(Kyoung-Boo Ryu) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
The combined high expansion foam fire extinguishing system (hereinafter combined system) is newly develiped high expansion foam system and the combined system will be replaced carbon-dioxide fire extinguishing system rapidly in future. The approval standards for the combined system is developing in IMO FP Sub-committee and the developing work would be completed in FP 54 held on April of 2010. In this paper, some discussion point of proposed approval standards for the combined system.
이경우(Kyoung-Woo Lee),김만용(Mann-Eung Kim),김유택(You-Taek Kim),이영호(Young-Ho Lee) 한국마린엔지니어링학회 2004 한국마린엔지니어링학회 학술대회 논문집 Vol.2004 No.-
The fire extinguishing capability of water-based fire extinguishing system largely depends on the pressure at nozzles. Hence, the pressure at nozzles is the most importance element to consider in the design work. Since it is difficult to perform the discharge test to confirm the pressure at nozzles, the hydraulic calculation is used to verify the pressure. To perform acceptable hydraulic calculation, there is a need to provide accurate hydraulic calculation standard. Such standard is the NFPA Code 750. In the Code, two flow energy loss calculation methods Darcy-Weisbach equation and Hazen-Williams equation - are prescribed. In this paper, the correlation of two calculation methods are reviewed and the hydraulic calculation standard for water mist extinguishing system is proposed.
이경우(Kyoung-woo Lee),김성윤(Seong-Yoon Kim),김정환(Jeong-hwan Kim),김만응(Mann-Eung Kim) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
This paper provides some information and results of experimental study for fire extinguishing capability of water based local application fire fighting system with single row arrangement. The results of this study had been submitted to IMO FP Sub-Committee as FP 54/24/1 and FP 54/INF.3.