• Smart Structures and Systems
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• 제24권1호
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• pp.67-81
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• 2019

Rows of closely adjacent buildings with similar dynamic characteristics are common building arrangements in residential areas. In this paper, we present a vibration control strategy for the seismic protection of this kind of multibuilding systems. The proposed approach uses an advanced Linear Matrix Inequality (LMI) computational procedure to carry out the integrated design of distributed multiactuation schemes that combine interbuilding linking devices with interstory actuators implemented at different levels of the buildings. The controller designs are formulated as static output-feedback H-infinity control problems that include the interstory drifts, interbuilding approachings and control efforts as controlled-output variables. The advantages of the LMI computational procedure are also exploited to design a fully-decentralized velocity-feedback controller, which can define a passive control system with high-performance characteristics. The main ideas are presented by means of a system of three adjacent five-story identical buildings, and a proper set of numerical simulations are conducted to demonstrate the behavior of the different control configurations. The obtained results indicate that interstory-interbuilding multiactuation schemes can be used to design effective vibration control systems for adjacent buildings with similar dynamic characteristics. Specifically, this kind of control systems is able to mitigate the vibrational response of the individual buildings while maintaining reduced levels of pounding risk.

• 전기학회논문지P
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• 제62권3호
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• pp.133-138
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• 2013

A large generator is an important role in transferring an electric power to power system. The IEDs of large generator often use microprocessor technology to obtain a digital relay system with a wide range of measuring, protection, control, monitoring, and communication functions. However, all generator protection and control systems in Korea imported from abroad and are being operated. In order to reduce the large expense and improve the reliable operation, development of generator protection and control system by domestic technology is required. This paper deals with the design of the IED of generator protection panel for development of generator protection and control system. The major emphasis of the paper will be on the description of hardware and signal processing test results and measurement accuracy of the prototype IED. By developing of generator IED based on DSP and microprocessor, replacement of the generator protection panel imports are expected to be effective.

• 한국통신학회논문지
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• 제37C권12호
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• pp.1211-1221
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• 2012

본 논문은 30 MHz 이하에서 동작하는 유도성 시스템과 전파통신 서비스의 공존을 위해서, 유도성 시스템의 간섭으로부터 전파통신 서비스를 보호하기 위한 보호 거리에 관한 것이다. 보호 거리 산출을 위해 유도성 시스템과 전파통신 서비스 간의 간섭 시나리오 모델을 제시하고 이를 기반으로 유도성 시스템의 방사 전력과 희생원의 허용 가능한 전계 강도를 비교하여 적용된 전파 모델에 따른 보호 거리를 산출하는 방법을 제안하였으며 이 방법을 적용한 RFID(Radio Frequency IDentification), PDP(Plasma Display Panel) TV의 간섭 분석을 통해, 30 MHz 이하의 전파통신 서비스 보호를 위한 보호 거리를 도출하였다. 제안한 방법은 2012년 6월 SG(Study Group) 1 회의에서 ISM 기기에 대한 결의 63과 관련된 ITU-R 권고서로 채택되어 유도성 시스템뿐만 아니라 무선전력 전송 및 전력선 통신 등에 의한 간섭 영향 분석에 활용될 전망이다.

• 한국초전도학회:학술대회논문집
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• 한국초전도학회 2008년도 High Temperature Superconductivity Vol.XVIII
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• pp.92-92
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• 2008

• 한국화재소방학회논문지
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• 제15권3호
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• pp.70-76
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• 2001

현 사회는 안락과 안전을 중요시하고 있다. 그 중, 가장 중요한 부분의 한 부분이 각 건축물에 설치되어 있는 소방시설의 관리와 방화훈련이 얼마나 잘 관리되고 평소 훈련이 되어있는가에 따라서 화재시에 인명과 재산상의 피해를 극소화 할 수 있다. 따라서, 본 연구에서는 공동주택, 상가건축물 및 사무소건축물 등의 소방시설의 점검실태를 설문 조사하였으며, 화재시에 대피훈련을 얼마나 숙지하고 있는가를 조사. 분석함으로써 화재시 손실을 최소화 할 수 있는 방법과, 실질적인 점검 및 훈련방법을 제시한다.

• 전기학회논문지
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• 제65권1호
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• pp.232-238
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• 2016

This paper presents protection techniques against electric shock in low voltage DC(direct current) grounding systems depending on the analysis of earth fault current paths. Firstly, the comparison between alternating current and direct current on human was conducted, and current threshold values for each current path and for long duration were analyzed. Secondly, the analyses of the earth fault current flows were performed depending on the grounding types and earth fault conditions. Lastly, based on these analyses, adequate protection measures of electric shock depending on low voltage DC grounding types were provided.

• Corrosion Science and Technology
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• 제7권6호
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• pp.328-331
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• 2008

Corrosion behaviour of water intake gate steel structures with different protective measures was investigated. Five material alternatives were taken for investigation, including: imported and recycled stainless steel, carbon steel with hot zinc spraying, painting and composite coatings. Results of corrosion rate for carbon steel, SUS 304, hot zinc spray coats in three water systems of Mekong river basin (saline, blackish and fresh) were also presented. Corrosion rate of carbon steel decreased with decreasing salinity in the investigated water environments. Meanwhile, these values for zinc coated steel, behaved by another way. Environmental data for these systems were filed and discussed in relation with corrosion characteristics. Method of Life Cycle Assessment (LCA) was applied in materials selection for water intake gate construction. From point of Life Cycle Cost (LCA) the following ranking was obtained: Zinc sprayed steel < Recycled stainless steel < Composite coated steel < Painting steel < SUS 304 From investigated results, hot zinc spray coating has been applied as protective measure for steel structures of water intake systems in Mekong river basin.

• 방재기술
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• 통권12호
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• pp.21-30
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• 1992

This fire fighting systems engineering specification includes the design and installation requirements which normally adopted for petroleum refineries and petrochemical industries. Also, this shall be applied the Korean Fire Safety Law, in addition to the Korean Industry Safety & Health Law and NFPA Code.

• 대한전기학회논문지:전력기술부문A
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• 제55권8호
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• pp.313-321
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• 2006

This paper describes the overvoltage obtained by surge behavior analysis in testing underground distribution systems. Model systems consist of overhead distribution line and underground cable. Such model system considered various characteristics of actual distribution systems will be soon constructed at testing yard. Simulation is carried out under various states such as cable kinds, cable length, lightning wave and time, and branch circuits. Model is established by EMTP/ATPDraw. Line Constants are calculated by ATP_LCC. When the direct lightning surge strikes on conductor of overhead line, the overvoltage is calculated using EMTP/ATPDraw in many cases. Simulation results will be compared with real testing results at testing yard in the near future. The compared results will be used to establish protection methods in actual underground distribution systems.

• 한국통신학회논문지
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• 제38A권6호
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• pp.471-478
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• 2013

미래의 고품질 통신 시스템을 위해서는 더욱 강력한 오류제어기법과 메시지 심볼 당 비트수의 증가가 요구되고 있다. 멀티미디어 데이터에서 메시지 비트들은 서로 다른 중요도를 가질 수 있다. 그러므로 이 경우, EEP(equal error protection) 보다는 UEP(unequal error protection)를 사용하는 것이 더 효과적일 수 있다. 그리고 LDPC(low-density parity check) 부호는 Shannon 한계에 근접하는 우수한 성능을 보인다. 따라서 본 논문에서는 고품질 메시지 데이터에 대한 LDPC 부호의 UEP 효과를 분석한다. MSE(mean square error)와 BER(bit error rate)과 심볼당 비트수의 관계를 이론적으로 분석하고 모의실험을 통하여 증명한다. 이를 위하여 전체 메시지비트를 중요도에 따라 두 그룹으로 나눈 후 전체 부호율과 부호어 길이를 고정시키고 각 그룹의 메시지 비트수를 변화시켜가며 모의실험을 통하여 UEP 성능을 나타내었다. 이 결과를 통하여 심볼당 비트수, 전체 메시지비트에서 각 그룹의 비율, 그리고 각 그룹의 보호정도에 따른 LDPC 부호의 UEP 성능을 분석하였다.