• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2007년도 추계학술대회 논문집
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• pp.63-66
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• 2007

Reformers which produce hydrogen from natural gas are essential for the operation of residential PEM fuel cells. For this purpose, steam-methane reforming reactions with Ni catalysts is primarily utilized. Commercial Ni catalysts are generally made to have porous pellet shapes in which Ni catalyst particles are uniformly dispersed over Alumina support structures. This study numerically investigates the reduction of catalyst effectiveness due to the mass transport resistances posed by porous structures of spherical catalyst pellets. The multi-component diffusion through porous media and the accurate kinetics of reforming reaction is fully considered in the numerical model. The preliminary results on the variation of the effectiveness factor according to different operation conditions are presented, which is planned to be used to develop correlations in future studies.

• 전기학회논문지
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• 제64권6호
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• pp.857-863
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• 2015

OF cable with excellent reliability and economic efficiency, has been used as the main cable of underground transmission in Korea. However, as XLPE cable is excellent in view points such as reduction of loss, convenience on the construction/operation, and manufacturing technology, it has been replaced as instead of OF cable. Also, when the aging occurs in some sections of OF cable, the section is replaced as XLPE cable without changing of whole cable line. However, there are some differences like electrical constants between both types of cables. Therefore if underground transmission system will be operated as combined connection composited of both cables, it should be proved that overvoltage is stable in steady and transient state. This paper describes the effectiveness of connection operation in combined OF and XLPE cable. For the evaluation of effectiveness, some important analysis such as sheath component voltage, lightning and switching overvoltage, single line-to-ground fault are carried out in steady and transient state. EMTP/ATPDraw is used for modeling and analysis of system.

• 한국도로학회논문집
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• 제16권3호
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• pp.75-84
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• 2014

PURPOSES : Traffic congestions which occur in the intersections of arterials lead to mobility and environment problem, and then traffic agencies and engineers have been struggling for mitigating congestions with greenhouse gas emissions. As an alternative of solving theses problems, this study is to introduce a low-cost and high-effectiveness countermeasure as unconventional intersections which are successfully in operation in U.S.. The main feature of unconventional intersections is to reroute turning movement on an approach to other approach, which consequently more green time is available for the progression of through traffic. Due to improved progression, this unique geometric design contributes to reduce delays with greenhouse gas emission and provides a viable alternative to interchanges. This study is to evaluate the potential operation and environment benefits of unconventional intersections. METHODS : This study used the VISSIM model with Synchro and EnViVer. Synchro is to optimize signal phases and EnViVer model to estimate the amount of greenhouse gas emissions by each condition. RESULTS : The result shows that unconventional intersections lead to increase the capacity and to reduce greenhouse gas emissions, compared to existing intersections. CONCLUSIONS : Unconventional intersections have the ability to positively impact operations and environments as a low-cost and high-effectiveness countermeasure.

• 정보처리학회논문지:컴퓨터 및 통신 시스템
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• 제11권2호
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• pp.59-66
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• 2022

합동 해안경계시스템은 해상경계시스템과 해안대침투경계시스템으로 구성되며 주로 해군이 해상경계를, 육군이 해안대침투경계를 책임지고 있는 시스템이다. 육군 및 해군의 다양한 무기체계가 복합적으로 운용되는 합동 해안경계시스템이 소형표적을 대상으로 어느 정도의 성공적인 작전수행이 가능한지에 대한 작전효과를 분석하였다. 작전효과 분석은 작전형태별 작전효과 정의, METT-T 요소를 활용한 모의환경 구성과 모의 시나리오 가정 수립, 모의실시 및 기상상태별 모의결과 분석으로 진행되었고 시뮬레이션 도구는 NORAM(해군작전 및 자원소요분석모델)과 EADSIM(통합방공작전분석모델)을 사용하였다. 작전효과 분석결과, 현재 운용중인 합동 해안경계시스템은 표적의 크기와 기상상태에 따라 작전성공에 상당한 차이를 보였다. 연구결과는 효과적인 합동 해안경계시스템을 구축하고 체계적인 경계작전을 수행하는데 유용한 자료로 활용될 수 있다.

• International Journal of Advanced Culture Technology
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• 제10권1호
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• pp.180-186
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• 2022

This study is a pilot study to confirm the effectiveness of training after applying emergency simulation training for inactive nurses and to present a new model of simulation training operation method. In this study, the control group is a group that directly participates in the simulation activity, and the experimental group is the group that observes the control group's simulation activity. Experimental group and control group were matched 1:1 to experience all the roles of the resuscitation team. The study participants were 5 inactive nurses in the experimental group and 5 inactive nurses in the control group, and the total training time was 5 hours. The emergency simulation operation composition consists of theory education, skill education, and simulation. The interview was conducted. The educational satisfaction of the participants was 4.65 points for theory education and 4.70 points for practical education based on 5 points. Participants' performance confidence improved from 3.60 points before operation to 7.20 points after operation. Emergency simulation operation consisted of pre-test, theory education, skill education, simulation implementation, debriefing, and post-test. Participants expressed that the choice of group greatly reduced the burden and anxiety about performing the role of the resuscitation team. However, difficulties and inexperience in the operation of the defibrillator were reported in the experimental group. The control group reported that the simulation activity of the experimental group was not significantly different from theirs. Through the results of this study, it was confirmed that emergency simulation education not only reduced the burden and anxiety of inactive nurses, but also had an effect of education. Based on the research results, it is proposed to expand the participants and verify the effectiveness of education through specific variables such as learning commitment, learner confidence, simulation satisfaction, and team effectiveness.

• 한국국방경영분석학회지
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• 제36권3호
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• pp.95-111
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• 2010

NCO(Network Centric Operation) 효과분석과 관련된 요소 및 이들 간 관계는 PCO(Platform Centric Operation)의 그것과 비교하여 복잡하다. 그러나 기존 효과분석모델은 단위 효과요소관점의 효과분석방법을 제시하여, 복잡한 NCO의 효과분석을 위해서는 엔터프라이즈 관점의 통합된 효과분석과 공통언어로 활용 가능한 효과분석모델 개발이 시급한 상태다. EA(Enterprise Architecture)는 공통언어 가능의 참조모델과 이에 순응하는 적용모델 개념을 도입하여 엔터프라이즈의 변화와 복잡도를 관리한다. 본 연구는 EA의 특성인 참조 및 적용모델 개념을 도입한 '참조모델기반 NCO 효과분석모델 개발방법'을 제시한다. 이를 위해 첫째 참조 및 적용모델 개념을 가진 EA를 연구하며, 둘째, NCO 및 C2 효과분석 절차 몇 모델 분석과 모델 구성요소 식별과 관계설정을 위한 방법을 연구하며, 셋째, 연구된 내용을 바탕으로 참조모델기반 NCO 효과분석모델 개발방법을 제시하고, 마지막으로 제시된 방법에 따라 사례를 개발하여 제시한 방법의 효과성을 입증한다.

• 한국건설관리학회논문집
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• 제9권2호
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• pp.81-89
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• 2008

본 연구는 프로세스 경영에 의한 건설업의 경영효과 분석을 목적으로 수행되었다. 즉 건설업 분야에서의 프로세스 경영에 대한 필요성과 지속적인 경영관리의 효율성 향상을 위해 수행되었다. 다음으로 본 연구의 수행을 위한 과정을 설명하면 다음과 같다. 첫째 프로세스경영에 대한 이론적인 개념을 정리하고, 둘째, 유사산업분야에서 기 개발된 프로세스경영 성숙도 모델을 건설업에 적용할 수 있도록 건설업 프로세스경영 성숙도 모델을 제시하였다. 셋째, 프로세스경영이 영향효과를 검토하기 위해 가설을 세우고, 설문조사 통하여 검증하였다. 상기와 같은 과정에 따라 도출한 결론을 요약하면 다음과 같다. 프로세스 IT 연계기술전략 실행에서는 유의적으로 분석되었으며, 자원관리체계에서는 비유의적으로 분석되었다.

• 한국컴퓨터정보학회논문지
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• 제21권7호
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• pp.93-100
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• 2016

This paper shows what kind of influence the learning motivation factors have on the effectiveness of Flipped Learning Model through the case of operating a JAVA programming subject. The Flipped Learning Approach consisting of Before Class, Before or At Start of Class, and In Class provides the students with learning motivation as well as satisfies Keller's ARCS(Attention, Relevance, Confidence, Satisfaction) to keep them studying steadily. This research conducts the operation of Flipped Learning and gets Exploratory Factor Analysis and Reliability Analysis from the result of the course experience questionnaire at the end of the class. Given this survey result, Flipped Learning approach improves the learners' satisfaction in class and the effectiveness in the fields of understanding learning context more than does the previous lecture-based learning approach by pacing learning procedure and conducting self-directed learning.

• 한국국방경영분석학회지
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• 제29권1호
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• pp.8-27
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• 2003

This paper develops a methodology that can be used to quantify the assesment of power improvement effectiveness of corps level C4I system applied to integrated fire operation by adapting Schuzer's C2 theory. This paper first describes how C4I systers can enhance the battle outcome in three way. : (1) Enhanced unit probability of survival; (2) Enhanced unit's individual effectiveness; improved exchange ratios; (3) Improved task force allocations : increased percentage of assets that can be assigned to a given engagement These enhancements are then show to result from improved probability of detection through information sharing; improved survivability and lethality through battle force coordination; and enhanced force allocation and prepositioning through improved timeliness of information(more advanced warning). It demonstrates that well-designed C4I systems can be shown to represent a significant force multiplier on the outcome of the battle.

• 시스템엔지니어링학술지
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• 제17권1호
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• pp.107-113
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• 2021

Plant Configuration Management(CM) is an activity to maintain consistency of design requirements, physical configuration, facility configuration information throughout the life cycle of the plant by systematically managing changes that occur during the plant design and operation process. Conformity between information must be ensured not only in the design stage, but also in the case of design changes in the operation and maintenance stages, and thus a computer system capable of efficiently managing them is required. In particular, in consideration of an application to small and medium-sized domestic plants, a computer system that can support configuration management at a low cost is needed. Accordingly, in this study, a configuration management system has been developed to support the management of plant design information and change procedures in the operation stage of small and medium-sized plants. Here, a case for quantitatively evaluating the effectiveness of the developed system is described.