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- 저자 : 이진휘(Jin-Hui Lee) (검색결과 44 건)
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솔-젤법에 의한 다공성 실리카 세라믹스의 제조-$H_2O/TEOS$ 몰비의 영향-
이진휘,김화중,이준,Lee, Jin-Hui,Kim, Wha-Jung,Lee, Joon 한국세라믹학회 1997 한국세라믹학회지 Vol.34 No.2
TEOS와 에탄올의 양을 고정하고 H2O/TEOS의 몰비가 2.6-59.0이 되는 범위에서 염산촉매를 사용하여 다공성 실리카 세라믹을 제조하였다. 서로 다른 조성의 솔 9종을 만든 후 젤화시간 측정, TG/DTA에 의한 건조시료의 열분석 및 FT-IR과 X-ray diffractometer에 의한 중간생성물의 특성분석을 수행하였고 50$0^{\circ}C$까지 열처리한 시료의 FT-IR에 의한 SiO2폴리머 분석, N2-adsorption isotherm을 이용한 비표면적과 기공크기분포 조사 및 TEM에 의한 SiO2폴리머의 형태와 기공의 변화를 조사하였다. 적용된 조성 및 촉매의 농도에서 최소 젤화반응시간은 TEOS1몰달 물의 양이 약 11몰에서, 가장 높은 중합도는 약 8-18몰에서, 그리고 가장 큰 비표면적값은 약 11몰에서 보였다. 이것은 물의 양이 약 11몰일 때 중합반응이 가장 빠르게 진행하였음을 의미한다. 결론적으로, 물의 양이 증가함에 따라서 약 11몰까지는 반응이 빠르게 진행되나 그 이상의 물이 사용될 경우 과잉의 물이 반응저해요인으로 작용하여 젤화시간의 지연 및 비표면적의 감소를 보인다. Porous silica ceramics were prepared(with HCI catalyst) using H2O/TEOS molar ratios of 2.6~59.0, with the EtOH/TEOS ratio fixed. After preparing 9 kinds of sol, the followings were investigated; measurement of the gelation time, thermal analyses by TG/DTA, property analyses of the intermediates by FT-IR and X-ray diffractometry with dried samples, analyses of SiO2 polymer by FT-IR, the investigation of specific sur-face area and pore size distribution by N2-adsorption isotherm, and structural change of SiO2 polymer and pore morphology by TEM observation, with samples heat-treated to 50$0^{\circ}C$. In the concentrations of in-vestigated compositions and catalyst, gelation time showed a minimum at ca. 11 moles of water per one mole of TEOS, the highest degree of polymerization at ca. 8-18 moles, and the largest specific surface area at ca. 11 moles, which means that the polymerization proceeded fastest at ca. 11 moles of water. In con-clusion, the more water used, the faster the polymerization reaction up to ca. 11 moles, but more than ca. 11 moles of water caused retardation of gelation and resultant reduction of specific surface area.
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이진휘 ( Jin Hui Lee ),이일우 ( Il Woo Lee ) 한국유화학회 2011 한국응용과학기술학회지 Vol.28 No.3
The studied results of the gasohol, which is the mixture of gasoline and ethanol, were investigated for the promotion of applications on commercially by gasoline vehicle referring to octane number, minimum water contents be involved, and separation inhibitors for protecting phase separation etc. especially for the E10 and E20. The results showed that octane number will be revised by higher value as the ethanol is added more, and it`s more effect in case of be added as a mixture than individually when inhibition agents is added for the inhibition of separation. and it`s reasonable for the water contents of less than 1% by comparing with experimental results and in view of regulations of various countries.
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이진휘 ( Jin Hui Lee ),정석재 ( Suk Jae Jeong ),한재현 ( Jae Hyun Han ) 한국로지스틱스학회 2012 로지스틱스연구 Vol.20 No.3
기업의 다국적 활동이 증가하면서 공급 사슬이 직면한 다양한 이슈들이 보다 글로벌 관점으로 확장되고 있지만, 공급 사슬 의사결정 문제와 기업의 재무적 성과를 통합하여 접근한 의사결정 모형을 제시한 연구는 충분하지 않다. 이에 본 연구에서는 글로벌 공급 사슬 의사결정 모형을 다룬 연구들을 대상으로 다음의 크게 세 가지 기준, (1) 글로벌 공급 사슬의 의사결정 유형 (2) 성과지표 유형 (3) 글로벌 재무 변수에 근거하여 분류하고 정리하였다. 고찰결과, 분석된 문헌들 중 대부분이 성과지표를 설정함에 있어 전통적인 공급 사슬에서 활용되는 비용최소화나 이익을 최대화하는 관점에 머물러 있으며, 또한, 글로벌관점에서 고려해야 할 요소들이 의사결정모형에서 단순히 매개변수로만 고려되고 있는 공통된 한계점을 가지고 있었다. 이에 본 연구에서는 향후 글로벌 의사결정 과정에 있어 장기적 관점에서 재무적 성과를 통합적으로 고려할 수 있는 연구 방향을 제시하고자 한다. As the multi-national activities of the firm has been increased, the diverse issues in supply chain management(SCM) have been expanded into a global perspective. But, there are not enough researches which have focused on integration between the supply chain decision making and financial performance of firm under global environments. With this goal in mind, this paper classify and summarize the studies addressing the global supply chain models on the basis of the following three criteria; 1) the characteristics of decision making in global SCM, 2) the characteristics of performance metrics, and 3) the factors considered in a global perspective. After review, we indicate that most of the papers have only considered the cost minimization or profit maximization which has been utilized in traditional SCM model as performance indicators. It has common drawbacks that global factors have only been expressed as simple parameters of models. In order to overcome that, we suggest the importance on the integration of financial values in designing the global SCM models.
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재무적 가치 기반의 공급사슬 통합 모형에 대한 연구 고찰
이진휘(Jin hui Lee),한재현(Jae hyun Han),정석재(Suk jae Jeong) 한국SCM학회 2012 한국SCM학회지 Vol.12 No.2
Though there has been lots of supply chain (SC) decision models which link between supply chain activities and financial performances, there are only few papers systematically surveying the various financial aspects in SC models. This paper reviews papers published during 1996-2011 in terms of relationship between SC model and financial performances. The classification scheme is based on ongoing and emerging issues in financial aspects resulted from a variety of supply chain activities. The classification includes following three dimensions of (1) decision making levels in SC, (2) Financial performance metrics in SC, and (3) solving methods in SC. Although we find that most models provide some solutions of SC activities and financial performances, only few models address the enterprise-wise SC decision models considering the strategic and tactical levels of SC activities, and finance simultaneously. Based on these papers, we recommend the future research direction on both forward-looking and realistic enough to apply to the corporation with multiple business divisions.
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공공분야 융합 서비스 개발 Framework에 대한 연구
이진휘(Jin-Hui Lee),이석규(Suke-Kyu Lee) 한국IT서비스학회 2013 한국IT서비스학회지 Vol.12 No.2
Due to the development of information technology, Convergence and Creative Economy became hot issues. For exa mple, products become more intelligent and services are likely to be connected and integrated around core services or provided as bundle solution. Meanwhile products and services are integrated in the context of mutual supplementation, which leads to Servitization of Products and Productization of Services in many industries. Previous studies have addressed Convergence with different terms and definitions such as Convergent, MulticategoryㆍMultifunctionalㆍProduct. Clouding Service, Bundle and so on from one perspective such as consumers, suppliers or technology according to a wide range of academic approaches. Thus, this study attempted to suggest the most typical convergence products released in the convergence environment and categorize those products. Furthermore. this study has pointed out the problems in the New Product Development Framework discussed in the studies on marketing by taking the situation of the public sector into account and then suggested "New Service Development Framework in the Public Sector" that are different from traditional e-Gov. approach basically and will enable the government to create public information service and provide them to enterprises or citizens. It also emphasized the importance of Business Conceptualization Stage in the framework ; argued that there is a necessity of an integrative study from the perspective of technology on the basis of the approach from the perspective of marketing and Policy such as a study of consumer behaviors, design and marketing channel and Policy Integration for the development and dissipation; and furthermore suggested the cases-the development/Diffusion of Transportation Card Service in Seoul and CFC (Call for Collaboration) in Singapore-in order to verify the framework. There is a need to supplement New Service Development Framework so it is able to reflect the distinct characteristics of the public sector from the academic perspective and be used as practical guidelines for SI (System Integration) business to shift into IT Service business. Last but not the least. this study has suggested the limitations and the directions for the future studies.
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이진휘 ( Jin Hui Lee ),김재곤 ( Jae Kon Kim ),임의순 ( Eui Soon Yim ),정충섭 ( Choong Sub Chung ),임화준 ( Hwa Jun Rheem ) 한국유화학회 2012 한국응용과학기술학회지 Vol.29 No.4
본 연구는 바이오매스에 기인한 에너지와 관련하여, 첨부된 문헌에 의하여 작성되었으며, 바이오에탄올, 바이오디젤 및 바이오가스에 대하여 본 논문을 작성하게 된 배경, 제조공정, 각국의 생산량, 시장현황, 규격 및 정책을 다루었다. 이 논문은 바이오 에너지와 관련하여 전반적인 지식과 장차 바람직한 방향을 모색하는 데에 도움을 줄 것이다. 바이오에너지는 신재생에너지로서 유용한 에너지이며, 다각도로 활용 방안을 모색하여야 한다. 결론에 현재의 상황을 고려하여 몇가지 방향을 제시하였다. This study is written by the methods of investigation of references be attached, and includes the background introduced, manufacturing processes, original properties, standards, amounts produced, market situation, ways of applied currently, and policies as a fuel manufactured by biomass on individual countries through the scope of worldwide, especially focused on bioethanol, biodiesel and biogas. It is prepared over multiple angles for the references, who want to getting information and searching desired ways in the future regarding to bioenergy. It is concluded that bioenergy is one of the useful renewable energy, and must to take a step forward by the approaching of multiple points, and finally showed some directions by the way of comparing of the situations and references nowaday.
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