• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 추계학술대회 논문집 전력기술부문
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• pp.381-383
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• 2002

This paper proposes a MATLAB program for solving security-constrained optimal power flow using linear programming. Security-constrained optimal power flow can find an optimal generation satisfying bus voltage limits, line flow limits, reactive generation limits, even if contingency occurs. Sensitivity matrixes are obtained based on power flow solutions with and without single line contingency. This program is tested for an IEEE 14bus system with 5 generators Results shows good ability of finding optimal solution in case of a single line contingency.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1987년도 정기총회 및 창립40주년기념 학술대회 학회본부
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• pp.122-124
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• 1987

This paper presents a new algorithm in formulating a performance index for contingency selection method considering voltage security. Security limits defined-in terms of real power line flows and voltage magnitudes are considered in normalized subspaces where in critical contingencies are identified by a filtering algorithm using the infinite norm. Two types of limits, warning limit and emergency limit, are introduced for voltage and line flow. Usually performance indices have been constructed for real power line flows and voltages with each different criterion. This paper, however, presents a method that constructs them with the same criterion in use of the norm properties, so that we can assess security considering both of them. Rapid contingency simulation is performed using one iteration of fast decoupled load flows with LMML(Inverse Matrix Modification Lemma).

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 춘계학술대회 논문집 전력기술부문
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• pp.245-247
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• 2001

This paper presents a series of simulation results of transient stability on SCOPF operated power system whose transmission capabilities are limited by voltage stability. Three steps of voltage security guidelines, 5[%], 7[%], 10[%] are introduced to increase power transfer from generation centers to load center and observed the effects of voltage guidelines to transient stability for three kinds of load level(peak, medium, off-peak). As a result, dynamic characteristics weren't affected by the voltage security limits in model system, but became worse for the off-peak level than peak case, and sustain oscillations are observed for the all load level. This gives us some intitutions for the development and applications of security limits to use SCOPF program in open electric market.

• 대한전기학회논문지:전력기술부문A
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• 제53권9호
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• pp.494-499
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• 2004

This paper presents to compute the power economic dispatch, an optimal power flow (OPF) computation algorithm, considering the load power factor limits constraint in developed. Efficient reactive power planning enhances economic operation as well as system security. Accordingly, an adequate level of power factor limits for the load busesshould be evaluated for economic operation. In this paper, the ranges of acceptable load power factors are portrayed as bandwidths of load power factor expressed as a function of load level. The load power factor limits are included and described into the OPF's objective function. The method Proposed is applied to IEEE 26 bus system.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 A
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• pp.98-100
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• 2003

This paper presents the method for computing the power economic dispatch with an optimal power flow (OPF) computation algorithm, considering the power factor limits constraint. Efficient reactive power planning enhances economic operation as well as system security. Accordingly, an adequate level of power factor limits for the load buses should be evaluated for economic operation. The power factor limits are included and described into the OPF's objective function. The proposed method is applied to IEEE 26 buses system.

• 한국재난관리표준학회지
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• 제3권1호
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• pp.61-66
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• 2010

최근 대두되고 있는 BIM 기술은 다양한 강점을 가지고 있다. 하지만 BIM을 단순히 3차원 모델로 생각하는 오해와, BIM 적용에 대한 체계적인 분석 및 시스템화의 부족으로 인해 BIM의 건설산업 도입은 어려움을 가지고 있다. 따라서 본 논문에서는 BIM 기반의 건설프로젝트에서의 리스크 관리를 목적으로 하여 그 적용 범위에 대한 체계적인 분석을 통하여 최적화된 BIM 기반의 프로젝트 단계별 리스크관리 모델을 제시하고자 한다.

• 시큐리티연구
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• 제26호
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• pp.59-87
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• 2011

경비업법의 주요 내용을 살펴보면, 경비업에 대한 규제적 측면에 치우쳐 있으며, 구체적인 권한 부여에 관한 규정이 명확히 제시되어 있지 않다. 이것은 경비업무을 실질적으로 수행하고 있는 경비원의 권한에 대한 근거 규정의 미비와 그러한 권한의 한계를 명확히 설정하지 못하는 문제를 야기하게 된다. 이에 따라 경비업법상 경비업 주체의 업무 수행의 한계를 부여함과 동시에 경비업무의 원활한 수행을 담보할 수 있는 권한 근거 규정을 도출할 수 있는 해석이 이루어져야 하며, 그러한 단서를 제공하는 것이 경비업법 제7조 제1항의 "관리권"이라 할 수 있다. 경비업법에 규정된 관리권의 범위에는 점유권에 기한 자력구제권을 근거로 하여 자력방위 및 자력탈환권이 포함되며, 사실적 지배행위로서 정지 및 질문권, 출입통제 및 퇴거요구권, 물품 검색 반입 보류 및 금지권 등이 인정된다고 할 것이다. 점유보조자의 지위에서 경비원은 관리권으로부터 도출될 수 있는 사전예방 활동을 할 수 있으며, 이러한 예방활동에도 불구하고 법익 침해가 예상되거나 이루어진 경우 관리권에 근거하여, 소극적 저항행위와 저항수단으로서의 유형력 범위 안에서 실력으로 침해를 저지 할 수 있다. 그리고 그러한 물리적 유형력을 행사하기 위해서는 형법상 위법성조각사유인 정당방위 긴급피난 정당행위의 요건을 구비하여야 한다.

• 한국사회복지학
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• 제59권4호
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• pp.111-136
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• 2007

우리나라 국민기초생활보장제도는 여전히 노동시장참여를 유인할 만한 체계가 불충분하여 취업을 통한 탈빈곤을 꾀하기에는 역부족이라는 문제가 지적되어 왔다. 반면 미국은 1996년 AFDC를 TANF로 대체하고, 근로의무나 수급기간제한 조항 등을 강화함으로써 대상자들의 탈빈곤을 달성할 것이라 인정받고 있다. 미국의 TANF가 우리제도에 대안적일 수 있는지에 대한 상반된 의견이 존재하는 가운데, 본 논문은 TANF가 과연 탈빈곤 효과가 있는지를 하부조항별로 분석하였다. 분석결과 TANF의 근로의무조항은 오히려 소득을 감소시키고 빈곤발생을 증가시키는 것으로 나타났다. 수급기간제한은 이와 반대의 결과가 발견되었으나 아직은 그것의 효과를 확신할 수 없는 단계이다. 이 분석 결과는 TANF도 탈빈곤이라는 목표를 달성하려면 대상자들을 무조건 노동시장으로 내모는 것으로는 불완전하고, 저임금 노동자를 둘러싼 근본 문제를 동시에 해결해야 함을 시사한다.

• 조명전기설비학회논문지
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• 제24권10호
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• pp.58-66
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• 2010

This paper shows an implementation and management result of wireless networks based security light control system, which performs a great role in protection of pedestrians and prevention of crime. Conventional security light units have severe limits in confirmation and inspection of security light unit failure, like wilful damage by someone or failure by influence of other equipment or failure by spontaneous heat-increase, and so on. In addition, local government offices are responsible for maintenance of security light units and as a matter of fact, most of civil complaints are about security light units. It is an obvious that the existing security light maintenance system reaches the limit and the security light maintenance problem is a difficulty of local government. Therefore, efficient security light control system is needed, which enables central control and intelligent maintenance. Moreover, the system has to be easy to control and has to be stable. In this study, wireless sensor network based security light control system is implemented, which is independent of programming language and platform, and which is simple to control and extend the system. The proven protocols, HTTP and SOAP, are utilized in order to improve the system reliability. This paper shows the excellence of our proposed system by implementing and operating it in real environment.

• 대한전기학회논문지:전력기술부문A
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• 제55권5호
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• pp.185-190
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• 2006

The security analysis relates to the ability of the electric systems to survive sudden disturbances such as electric short circuits or unanticipated loss of system elements. It is composed of both steady state and dynamic security analyses, which are not two separate issues but should be considered together. In steady state security analysis including voltage security analysis, the analysis checks that the system is operated within security limits by OPF (optimal power flow) after the transition of a new operating point. On the other hand, dynamic security analysis deals that the transition will lead to an acceptable operating condition. Transient stability, which is the ability of power systems to maintain synchronism when subjected to a large disturbance, is a principal component in dynamic security analysis. Usually any loss of synchronism will cause additional outages. They make the present steady state analysis of the post-contingency condition inadequate for unstable cases. This is the reason of the need for dynamics of systems. Probabilistic criterion can be used to recognize the probabilistic nature of system components and shows the possibility of system security. A comprehensive conceptual framework for probabilistic static and dynamic assessment is presented in this paper. The simulation results of the Western System Coordinating Council (WSCC) system compare an analytical method with Monte-Carlo simulation (MCS). Also, a case study of the extended IEEE Reliability Test System (RTS) shows the efficiency of this approach.