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외식환경, 호텔 조리부서의 6시그마기법, 및 업무몰입간의 관계
김현묵(Hyeon-Muk Kim),유영진(Young-Jin Yoo) 한국콘텐츠학회 2008 한국콘텐츠학회논문지 Vol.8 No.8
본 연구는 역동성, 우호성, 및 복잡성을 포함하는 외식환경이 고객지향성, '지속적인 개선', 및 팀웍으로 구성되는 호텔기업 조리부서의 6시그마 품질경영활동에 미치는 영향과, 이 6시그마 품질경영활동이 호텔기업 조리부서 종사원의 업무몰입에 미치는 영향을 연구하였다. 분석 결과, 첫째, 외식환경의 역동성, 우호성, 및 복잡성은 조리부서의 고객지향성, ‘지속적인 개선’, 및 팀웤의 6시그마 품질경영활동에 영향을 미쳤고, 둘째, 이 6시그마 품질경영활동 중 ‘지속적인 개선’과 팀웍은 호텔기업 조리부서 종사원의 업무몰입에 영향을 미쳤다. 이상과 같은 실증분석의 결과를 종합해 볼 때 6시그마는 호텔기업의 조리부서에 도입될 필요성이 있으며, 조리부서의 종사원의 업무몰입에 도움이 되는 것으로 판단된다. 따라서 조리 상품의 특성을 고려하여 사전에 충분한 준비과정을 거쳐서 6시그마기법을 조리부서 경영에 도입한다면 프로세스 개선, 결함제거, 종사원의 업무몰입이 실현되어 경영성과를 높이는 계기가 될 것이다. One recurrent theme within the literature on 6 sigma was the study of its effect on organizational performance. Nonetheless, most research were focused on analyzing the relationships between the implementation of different elements and several types of performance. This research incorporated the effect of organizational environment as a variable for explaining the impact of 6 sigma on business results. The model was tested using regression analyses, employing a survey of employees of hotels' cuisine departments involved in 6 sigma. The causal analysis results showed that dynamism, munificence and complexity influenced the degree of implementation of the main 6 sigma principles. Similarly, the dimensions of 6 sigma had an impact on employees' work commitment. The model could be used by hotels to assess their level of 6 sigma success depending on specific environmental characteristics.
Lee, Hyeon-Ji,Kim, Jung-Hwan,Won, Ji-Hye,Lim, Jun-Muk,Hong, Young Taik,Lee, Sang-Young American Chemical Society 2013 ACS APPLIED MATERIALS & INTERFACES Vol.5 No.11
<P>We demonstrate highly flexible, proton-conductive silicate glass electrolytes integrated with polyimide (PI) nonwoven fabrics (referred to as “b-SS glass electrolytes”) for potential use in medium-temperature/low-humidity proton exchange membrane fuel cells (PEMFCs). The b-SS glass electrolytes are fabricated via in situ sol–gel synthesis of 3-trihydroxysilyl-1-propanesulfonic acid (THPSA)/3-glycidyloxypropyl trimethoxysilane (GPTMS) mixtures inside PI nonwoven substrates that serve as a porous reinforcing framework. Owing to this structural uniqueness, the b-SS glass electrolytes provide noticeable improvements in mechanical bendability and membrane thickness, in comparison to typical bulk silicate glass electrolytes that are thick and easily fragile. Another salient feature of the b-SS glass electrolytes is the excellent proton conductivity at harsh measurement conditions of medium temperature/low humidity, which is highly important for PEMFC-powered electric vehicle applications. This beneficial performance is attributed to the presence of a highly interconnected, proton-conductive (THPSA/GPTMS-based) silicate glass matrix in the PI reinforcing framework. Notably, the b-SS glass electrolyte synthesized from THPSA/GPTMS = 9/1 (mol/mol) exhibits a higher proton conductivity than water-swollen sulfonated polymer electrolyte membranes (here, sulfonated poly(arylene ether sulfone) and Nafion are chosen as control samples). This intriguing behavior in the proton conductivity of the b-SS glass electrolytes is discussed in great detail by considering its structural novelty and Grotthuss mechanism-driven proton migration that is strongly affected by ion exchange capacity (IEC) values and also state of water.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2013/aamick.2013.5.issue-11/am400836h/production/images/medium/am-2013-00836h_0010.gif'></P>
Lee, Hyeon-Ji,Lim, Jun-Muk,Kim, Hyun-Woo,Jeong, Sang-Hwan,Eom, Seung-Wook,Hong, Young Taik,Lee, Sang-Young Elsevier 2016 Journal of membrane science Vol.499 No.-
<P><B>Abstract</B></P> <P>Despite the commercial success of primary Zinc (Zn)–air batteries, rechargeable Zn–air batteries are still far behind meaningful performance levels. Among numerous challenges facing rechargeable Zn–air batteries, from the material point of view, separator membranes should not be underestimated, along with other battery components such as anodes, cathodes and electrolytes. More particularly, crossover of soluble zincate Zn OH 4 2 - ions through separator membranes from Zn anode to air cathode, which significantly affects electrochemical performance of Zn–air cells, has hardly been addressed. Here, as a facile and scalable strategy to resolve the separator membrane-related issues, we demonstrate a new class of electrospun nanofiber mat-reinforced permselective composite membranes (referred to as ERC membranes) and explore their potential contribution to development of rechargeable Zn–air cells in terms of transport phenomena of hydroxyl (OH<SUP>−</SUP>) and Zn OH 4 2 - ions. The ERC membrane is fabricated by impregnating polyvinyl alcohol (PVA) into electrospun polyetherimide (PEI) nanofiber mat. The PEI nanofiber mat acts as a compliant framework to endow dimensional stability and mechanical strength. The PVA matrix, after being swelled with electrolyte solution, provides ion size (OH<SUP>−</SUP> vs. Zn OH 4 2 - )-dependent conductive pathways. This architecture/material uniqueness of the ERC membrane effectively suppresses permeation of bulky Zn OH 4 2 - ions without impairing OH<SUP>−</SUP> conduction, thereupon achieving exceptional cycle capacity retention of Zn–air cells far beyond those accessible with conventional microporus polyolefin separators. The ERC membrane featuring the ion size exclusion-based permselectivity opens a new membrane-driven opportunity that leads us closer toward rechargeable Zn–air batteries.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Membrane-driven opportunity to facilitate progress of rechargeable Zn-air cells. </LI> <LI> Electrospun PEI nanofiber mat-reinforced permselective PVA separator membrane. </LI> <LI> The new separator shows superior permselective transport of OH<SUP>−</SUP> and Zn OH 4 2 - ions. </LI> <LI> The exceptional permselectivity improves cycle capacity retention of Zn–air cells. </LI> <LI> Structural analysis of cathode surface after cycling verifies separator contribution. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
A Study of Effective Defense-In-Depth Strategy of Cyber Security on ICS
Seong-Muk Choi,Rae-Hyung Kim,Ga-Ye Kim,Hyeon-Kyung Lee,GwangYong Gim,Jong-Bae Kim 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.5
The system of SCADA(Supervisory Control and Data Acquisition Security) used in electricity, water, petroleum and gas, transportation as well as manufacturing, is to collect scattered data and to monitor assets related as a centralized suppression system. ICS system, including current SCADA, is not isolated from outside, being connected with IT solution, and can operate equipment through broadband network, instead of accessing physically. Accordingly, the security accident of suppressing system can occur in the fields of antagonistic nations, terrorists, foundational facility invaders, natural disasters and ill-will or accidental actions. The security control examined in this study provides a defense-in-depth strategy which is applicable to the effective cyber security strategy regarding ICS to protect the confidentiality of information, zero defect, availability through the classification of control, operational control and technological control.