• Journal of Electrical Engineering and Technology
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• v.13 no.2
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• pp.568-579
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• 2018

Virtual power plants can be regarded as systems that have entered the network after restructure of power systems. In fact, these plants are a set of consumers capable of consuming and generating power. In response to widespread implementation of plug-in hybrid electric vehicles, further investigation of energy management in this type of power plants seems to be of great value. In effect, these vehicles are able to receive and inject power from/into the network. Hence, study of the effects of these vehicles on management of virtual power plants seems to be illuminative. In this paper, management of power consumption/generation in virtual power plants has been investigated in the presence of hybrid electric vehicles. The objective function of virtual power plants problem management is to minimize the overall costs including not only the costs of energy production in power generation units, fuels, and degradation of batteries of vehicles, but also the costs of purchasing electricity from the network. Furthermore, the constraints on the operational of plants, loads and hybrid vehicles, level of penalty for greenhouse gas emissions ($CO_2$ and $NO_x$) produced by power plants and vehicles, and demand response to the immediate price of market have all been attended to in the present study. GAMS/Cplex software system and sample power system have been employed to pursue computer implementation and simulation.

• The Korean Journal of Emergency Medical Services
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• v.26 no.1
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• pp.21-36
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• 2022

Purpose: This descriptive research study aimed to investigate the knowledge and perception of the natural disaster medical system by relevant disaster medical response teams in Jeonnam region, and provide baseline data for a disaster education program based on analysis of priorities of educational demand. Methods: Online questionnaires were distributed to 200 research participants including paramedics from five fire stations in J province, 22 public health centers, two disaster base hospitals, ERU (Emergency Response Units), and DMAT (Disaster Medical Assistance Team). The questionnaires elicited basic information about respondents, their knowledge and perception on disaster preparation and response, cooperation system, and educational and training needs. Results: The top priority items selected were: other disasters for paramedics, first aid for the rapid response team, and command system for DMAT. Conclusion: Customized education and training programs must be developed to suit each organizational need. Detailed operational guidelines must be established and with them a unified educational curriculum should be put into practice.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.83-84
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• 2011

최근 전 세계적으로 여러 국가들과 기업들이 효율을 극대화시키는 에너지관리에 관심을 갖고, 그에 따른 연구와 개발을 진행하고 있다. 본 논문에서는 에너지 효율을 극대화하고 전력수요 측의 역할을 증대시키는 수요반응(Demand Response)에 대한 국내외 수요반응 현황을 조사하여 분석하였다. 그리고 해외에서 실행되고 있는 수요반응 프로그램 중에 우리나라 수요반응 운영 프로세스에 적용할 수 있는 여러 가지 프로그램을 분석하여 우리나라 실정에 맞는 형태로 개발하여 적용할 수 있는 방법을 제시하였다.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.533_534
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• 2009

본 논문에서는 수요반응(Demand Response) 프로그램 적용 시 각 소비자의 부하패턴 변화에 따른 계통운영자(Independent System Operator : ISO)의 총 발전비용 변화량을 Shapley Value를 이용하여 각 소비자가 총 발전비용 감소에 기여한 정도를 파악할 것이다. 또한 사례연구를 통하여 수요반응 프로그램에서의 각 부하패턴 변화 유형에 따른 총 발전비용 감소에 대한 기여도 및 Shapley Value 적용 전후의 결과를 비교 분석하였다.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.213-214
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• 2015

국내에 수요자원 거래시장은 개설이 되었지만 아직까지 여러 목적에 맞는 최적 입찰전략에 대해서는 논의된 바가 많지 않다. 본 논문에서는 수요자원 중에서도 특히 산업용 수용가 ESS(Energy Storage System)에 대해서 경제성 DR(Demand Response) 시장에 참여 할 때 최대의 이익의 얻을 수 있는 입찰전략을 제시하였다. 그리고 이익 뿐만 아니라 유찰 위험까지 고려할 수 있는 현대 포트폴리오 이론을 적용한 입찰전략을 제시하였다.

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.54 no.10
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• pp.475-479
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• 2005

Nowadays large-scale blackout was occurred in many developed countries. The do-regulation and competition in power industry might have an effort on the disaster. The demand response algorithm for protecting it is needed, and developed introducing the concept of transient stability by nonlinear transition matrix. Two case studies are carried out.

• Proceedings of the Earthquake Engineering Society of Korea Conference
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• 2003.03a
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• pp.69-76
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• 2003

Near-field ground motions exhibit special characteristics that are different from ordinary far-field ground motions. This paper first briefly examines the characteristics of near-field ground motions associated with fault directivity and fling-step effects. Then evaluation of near-field ground motions by inelatstic response spectrum analysis is performed and analyzed. As a result, ductility demand in near-field ground motions is larger in hanging wall than in foot wall in long period regions. Also in long period regions ductility demand in soil site is larger than that in rock site.

• Proceedings of the KIEE Conference
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• summer
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• pp.150-152
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• 2004

Nowadays large-scale blackout was occurred in many developed countries. The dereguration and competition in power industry might have an effort on the disaster The demand response algorithm for protecting it is needed. and developed introducing the concept of transient stability by nonlinear transition matrix Two case studies are carried out.

• Journal of the Korean School Mathematics Society
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• v.16 no.4
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• pp.899-925
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• 2013

The purpose of this study was to examine how constructive-response questions in regular test was in aligned with the nature and goals of 2007 Curriculum Amendment. For this purpose, data were collected and analysed by using the framework for mathematical task and the cognitive demand of tasks suggested by Smith & Stein(1998) and mathematical proficiency suggested by National Research Council(2001). In particular, it aimed to reveal the overall picture of the level of cognitive demand and the proportion of mathematical proficiency of constructed-response items created by secondary mathematics teachers. The findings from the analysis showed that 70 percent of the constructed-response items were at low-level and the rest at high-level in terms of cognitive demand. Also, the constructed-response assessment focused on conputing (89%), understanding(45%), applying(30%) and least reasoning(17%). Most of the constructed-response items included computing and were algorithmic.

• Industrial Engineering and Management Systems
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• v.13 no.3
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• pp.297-303
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• 2014

Stock pre-positioning is one of the most important decisions for preparing the stage of emergency logistics planning. In this paper, a mixed integer model for stock pre-positioning is derived to support an emergency disaster relief response against the event of earthquake. A maximum response time limit, budget availability, multiple item types, and capacity restrictions are considered. In the model, the decision of the distribution centers to cover a disaster area and the amount of supplies to be stocked in each distribution center are simultaneously determined to maximize the total expected relief demand of the disaster areas covered by the existing distribution centers. The proposed model is applied to a real case with 33 disaster areas and 16 distribution centers in Indonesia. Several sensitivity analyses are conducted to estimate the fluctuation on the emergency stock pre-positioning planning by changing the maximum response time and budgets.