• 한국화재소방학회:학술대회논문집
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• 한국화재소방학회 1996년도 학술발표회
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• pp.76-79
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• 1996

This paper provides an overview or an introduction covering the nature of explosions, explosion protection techniques and explosion protection systems(EPS), It is not intended to be a result for the design or research of protection including explosion suppression, venting, isolation, and an explanation to the mechanical system.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 B
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• pp.807-809
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• 1998

Plant Protection Systems(PPS) are those systems that initiate safety actions to mitigate the consequences of design basis events by sending signals to Reactor Trip Switch Gear System(RTSS) and Engineered Safety Features-Component Control Systems(ESF-CCS). This paper illustrates distinctive features and improved design concepts of Korea Next Generation Reactor(KNGR) based on the experience obtained through prototyping of PPS.

• 한국정보통신학회논문지
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• 제22권5호
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• pp.818-828
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• 2018

현재 네트워크 정보보호를 위하여 다양한 보안 시스템들이 개발되어 활용되고 있다. 보안 솔루션을 도입하는 것만으로 보안상의 위험을 상당수 방지할 수 있지만, 보안 솔루션은 그 목적과 기능에 따라 적절한 형태로 사용되어야 충분한 가치가 발휘될 수 있다. 정보보호시스템에 많이 사용되는 보안 솔루션으로는 방화벽, IDS, IPS 등이 있다. 그러나 다양한 정보보호시스템을 도입하고 있더라도 이를 우회하여 공격하는 기법은 항상 존재한다. 본 논문에서는 정보보호시스템에서 우회공격 기법에 대한 대응 방안과 우회 공격 기법을 훈련에 적용할 수 있는 효과적인 훈련 시나리오를 제안한다. 제안한 대응 훈련 시나리오의 유효성을 검증하기 위해 GNS3 네트워크 시뮬레이터를 사용하였으며, VirtualBox를 이용하여 가상 운영체제를 구축하였다. 제안하는 네트워크 정보보호시스템을 우회하는 공격에 대한 대응훈련 시나리오는 실제 공격에 대응하는데 매우 효과적으로 활용될 수 있다.

• Corrosion Science and Technology
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• 제2권4호
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• pp.202-206
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• 2003

Fusion Bonded Epoxy(FBE) systems have been widely used to protect pipelines for over 30 years. Numerous attempts have so far been made to improve the properties of FBE coatings such as chemical resistance, adhesion, water resistance, cathodic disbondment resistance, impact resistance, and flexibility to protect pipelines at a wet and a high temperature condition. But these attempts have not been successful in reducing some weakness, for instance, in pipeline operating at high temperature due to poor hot water resistance and cathodic protection. The purpose here is to build a basis for getting better corrosion resistance of FBE systems. Cresol-novolac epoxy coating systems were studied compared to bisphenol A type epoxy systems. After the immersion of the film in water at a high temperature for a long period, good adhesion to metal substrate and excellent cathodic disbond resistance were observed in the cresol-novolac epoxy resin systems. It is well known that the adhesion of organic coatings to metal substrate might be decreased due to the disruption of a chemical bond across the film and metal interface induced by water molecules. A high crosslinking density might decrease water permeability and improve cathodic disbonding protection in the coatings. Other factors are studied to understand anti-corrosion mechanism of Cresol-novolac epoxy coatings. In addition, the water absorption rate and the effect of cure temperature on the adhesion and cathodic disbonding resistance ofthe films were studied in different epoxy coatings and the effect of substrate was evaluated. The results of field application are proved that the Cresol-novolac epoxy coating system developed recently is one of the most suitable coatings for protection of pipelines.

• 한국산학기술학회논문지
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• 제10권9호
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• pp.2253-2260
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• 2009

본 논문에서는 태양광과 풍력, 연료전지 등의 신 에너지전원(또는 분산전원)이 연계된 배전계통에 있어서 발생 가능한 보호협조의 문제점을 해결하기 위한 통합 보호기기의 알고리즘을 제시한다. 신 에너지전원을 배전계통에 연계함으로써 에너지 효율을 높일 수 있으며, 송배전 선로 건설비용의 절감, 전력 손실 감소, 전압 보상 및 전력 공급의 신뢰도 향상과 같은 많은 장점을 얻을 수 있다. 이러한 많은 장점에도 불구하고 신 에너지전원을 배전 계통에 연계하였을 경우, 전압변동, 고조파, 전력 품질 저하, 단락 용량 증대와 같은 많은 문제점도 발생하여, 이러한 문제점을 해결하기 위한 계통연계 장치 및 보호기기의 필요성이 증대하고 있는 실정이다. 즉, 현재의 배전계통 보호 방식은 단방향 조류방식으로 구성되어 있으나 분산전원의 도입으로 보호 기기가 설치되어 있는 계통에 정상상태임에도 불구하고 역방향의 전력조류가 발생될 수 있다. 따라서 본 논문에서는 이에 대한 새로운 배전 보호 알고리즘을 탑재한 보호기기의 알고리즘을 제시한다.

• Journal of Information Processing Systems
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• 제2권2호
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• pp.95-100
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• 2006

While conventional business administration-based information technology management methods are applied to the risk analysis of information systems, no security risk analysis techniques have been used in relation to information protection. In particular, given the rapid diffusion of information systems and the demand for information protection, it is vital to develop security risk analysis techniques. Therefore, this paper will suggest an ideal risk analysis process for information systems. To prove the usefulness of this security risk analysis process, this paper will show the results of managed, physical and technical security risk analysis that are derived from investigating and analyzing the conventional information protection items of an information system.

• 전기학회논문지P
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• 제59권2호
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• pp.158-162
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• 2010

PSD is automatically opened and closed when subway train arrive on the station. This system was designed to control electric automatic system. These doors will provide passenger safety, energy saving and a good environment in subway. The monitoring and control systems of PSD are configured so that they can be operated in automatic mode in connection with ATO through the composite control panel in the station control room. The objective of this paper is to obtain high reliability that is essential for monitoring and control systems of PSD. The power supply is based on protection circuit using DC power bridge from two UPS. Also, stable communication system consists of CAN communication line redundancy and RF cross protection algorithm. Monitoring state display results show the validity of the proposed high reliability monitoring and control systems of PSD.

• 한국해양공학회지
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• 제30권2호
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• pp.134-140
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• 2016

An envelope protection system is a control system that allows a submarine to operate freely using its own operational envelope without exceeding the structural limit, dynamic limit, and control input limit. In this paper, an envelope protection system for the pitch angle of a submarine is designed using a dynamic trim algorithm. A linear quadratic regulator and artificial neural network are used for the true dynamics approximation. A submarine maneuvering simulation program developed using experimental data is used to validate the designed envelope protection system. Simulation results show the effectiveness of the designed envelope protection system.

• Corrosion Science and Technology
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• 제10권3호
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• pp.95-100
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• 2011

Protective coatings play an important role in the protection of metallic structures against corrosive environment. The main function of anticorrosive coating is to prevent the materials from corrosive agents, such as water, oxygen and ions. In the study, the corrosion protection properties of urethane and epoxy coating systems were evaluated using EIS methods exposed to the corrosion acceleration test such as Norsok M501, Prohesion and hygrothermal cyclic test. AFM analysis of the coating systems was carried out to monitor the change of roughness of coatings. Urethane coating system was more stable than the epoxy coating under given cyclic conditions. Water uptake into the urethane coatings was less than that into the epoxy coating. The urethane coating system showed better corrosion protection than epoxy coating system based on the changes of the impedance modulus at low frequency region with exposure time. Consequently, the corrosion protection properties of the epoxy and urethane coatings was well correspond with their surface roughness changes and water uptakes.

• Journal of Electrical Engineering and Technology
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• 제12권6호
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• pp.2089-2098
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• 2017

Microgrid is a convenient, reliable, and eco-friendly approach for the integration of Distributed Generation (DG) sources into the utility power systems. To date, AC microgrids have been the most common architecture, but DC microgrids are gaining an increasing interest owing to the provision of numerous benefits in comparison with AC ones. These benefits encompass higher reliability, power quality and transmission capacity, non-complex control as well as direct connection to some DG sources, loads and Energy Storage Systems (ESSs). In this paper, main challenges and available approaches for the protection of AC and DC microgrids are discussed. After description, analysis and classification of the existing schemes, some research directions including coordination between AC and DC protective devices as well as development of combined control and protection schemes for the realization of future hybrid AC/DC microgrids are pointed out.