• 한국철도학회:학술대회논문집
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• 한국철도학회 2000년도 춘계학술대회 논문집
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• pp.202-209
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• 2000

This paper introduces the main function and protection method of IGBT gate driver that designed by KOROS. Recently, the applications of insulated gate bipolar transistors(IGBTs) have expanded widely, particularly in the area of railway converters. This driver is suitable for railway traction applications, so they are designed for circumstance of railway vehicle such as vibration. The input control power for this driver is supplied from battery charger of railway. it is no necessary an isolated power supply board or auxiliary power supply, with substantial savings in cost and space in railway applications. This gate driver can be used wide range of input voltage. So, performance of the driver has no relation with the battery voltage(70V∼110V). The protection methods of IGBT gate driver have many kind of ways, but this gate driver it designed to apply to converter for railway system, so this gate driver includes protection for arm short current and low control power voltage, etc. And the process of protection method and protection reference value are optimized by means of sufficient test with our own facilities.

• Journal of Radiation Protection and Research
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• 제34권1호
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• pp.1-7
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• 2009

It is expected that a substantial amount of spent fuels will be transported from the four nuclear power plant (NPP) sites in Korea to a hypothetical centralized interim storage facility or a final repository in the near future. The cost for the transportation is proportional to the amount of spent fuels. In this paper, a cost estimation program is developed based on the conceptual design of a transportation system and a logistics analysis. Using the developed computer program, named as CASK, the minimum capacity of a centralized interim storage facility (CISF) and the transportation cost for PWR spent fuels are calculated. The PWR spent fuels are transported from 4 NPP sites to a final repository (FR) via the CISF. Since NPP sites and the CISF are located along the coast, a sea-transportation is considered and a road-transportation is considered between the CISF and the FR. The result shows that the minimum capacity of the interim storage facility is 15,000 MTU.

• 자원환경지질
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• 제44권6호
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• pp.533-539
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• 2011

미국에서는 재난으로 인한 기반시설물의 피해를 줄이기 위해 국가기반시설 리질리언스 확보가 국가기반시설보호계획에 활용되고 있다. 여기서 "리질리언스"는 재난으로 인한 시스템의 영향을 효율적으로 줄일 수 있는 기반시설 시스템의 능력으로, 리질리언스 비용으로 정량화가 시도되었다. 리질리언스 비용은 시스템 영향과 복구노력을 합한 것으로, 리질리언스 평가 사례는 리질리언스 평가시 복구노력을 고려할 필요가 있음을 보여주고 있다. 본 논문은 리질리언스 비용을 설명하고, 연구 사례를 통해 리질리언스 비용의 평가 방법을 보여주고자 한다.

• 한국중재학회지:중재연구
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• 제12권1호
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• pp.207-239
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• 2002

The redemption system for consumer's claim is intended to deal with the conflicts between consumers and firms in their transaction of goods and service ensuring consumer's basic right. In general, the redemption system for consumer's claim requires promptness of redemption, free charge of claim procedure for consumers and constructive response of firms. However, the current redemption system in Korea has some limitations in its authority in the sense that it has only the right for mediation of consultation and agreement and thus the involved consumer should forfeit his/her claim or should go to legal suit which requires high cost and time when the mediation work is failed between two parties. As it is shown in result of survey on empirical cases produced by the Consumer Dispute Mediation Committee in Consumer Protection Board of Korea in 2001, the 20.3％ of total claims have failed to reach final mediation, while the BBB case in the U. S. has recorded 19％ of arbitration success after its failure in mediation. Therefore, it is strongly recommended for Korea to augment current. arbitration system toward assuring firm's cost liability, the principle of quick procedure through agreement on arbitration upon consumer's request. It is thus prerequisite for firms to be armed with the concrete entrepreneurship of responsibility on cost liability. In conclusion, we suggest restructuring of currently existing institution, rather than establishing new one through substantial augmenting the role of Consumer Dispute Mediation Committee In Consumer Protection Board of Korea and enlarging its business criteria of The Korean Commercial Arbitration Board by progressive development of the consumer protection program through amendment of current law for consumer protection.

• 자연과 농업
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• 통권265호
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• pp.22-25
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• 2011

대부분의 오염이나 환경문제, 문명 과학발달로 생겨 편익(benefit)과 비용(cost)의 균형 취하는 일 매우 중요.

• Journal of Radiation Protection and Research
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• 제14권2호
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• pp.1-9
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• 1989

방사선 방어를 위한 방안을 결정하는데 도움을 주기 위해서는 각종 방사선 방어 최적화 방안들 사이에 정량적인 비교를 할 수 있는 해석적 방법이 필요하다. 본 논문에서는 발전소에서 행해지고 있는 검사, 시험 및 보수가 방사선 방어에 미치는 영향을 평가할 수 있는 동적 마코프 모델의 개념을 도입하였다. 마코프 모델의 응용을 다루기 위해 예로 든 증기발생기 전열관 파열에서는 고리 2호기와 외국의 자료에 기초해 비용과 피폭 선량을 줄이기 위한 증기발생기의 최적 검사주기를 산출하였으며 그 결과 피폭 선량은 비용에 비해 그 기여도가 매우 낮은 것으로 나타났다. 예제 계산이 이용된 마코프 모델은 자료를 좀 더 보강함으로써 국내 발전소에도 쉽게 적용할 수 있으며 방사선 방어의 최적화를 위한 여러 가지 대안의 비교 우위를 평가하는 데에도 이용할 수 있다.

• 정보처리학회논문지C
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• 제12C권1호
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• pp.77-82
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• 2005

광 네트워크에서의 효율성과 안정성을 위해 보호 복구가 요구되면서 기존의 여러 보호 복구 방법들이 제안되고 있으며, 많은 연구가 진행되고 있다. 기존 연구 중에서 네트워크 토폴로지를 하나의 사이클로 구성하여 어느 한 링크가 손상되더라도 복구가 가능한 방법들이 제시되고 있다. 본 논문에서는 해밀턴 사이클(Hamiltonian cycle)을 이용하여 네트워크 토폴로지를 하나의 사이클이 아닌 몇 개의 다중 도메인으로 분리하여 장애 발생 시 해당 도메인 내에서 복구경로 설정이 가능한 알고리즘을 제안한다. 제안된 알고리즘을 시뮬레이션을 통해 분석한 결과 복구경로길이가 단일 사이클의 경우에 비해 $57{\%}$ 이상 감소함을 볼 수 있다. 즉, 다중 도메인으로 분리, 보호복구를 수행 할 경우 복구 용량의 증가는 크지 않으면서 고속 복구가 가능함을 확인할 수 있다.

• Corrosion Science and Technology
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• 제21권1호
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• pp.1-8
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• 2022

The use of cathodic protection for metals can be achieved by sacrificial anode CP or impressed current CP, or a combination of both. Cathodic protection is a highly effective anti-corrosion technique for submerged metals or metals in soil. But because the non-immersion atmospheric automobile environment is a high resistance environment, it is limited by fundamental cathodic protection. However, the application of cathodic protection to automobiles is attractive because of the possibility of maintaining corrosion resistance while using lower-cost materials. A commercially available product for automobiles that uses both sacrificial anode CP and impressed current CP was tested in a periodic salt spray environment to investigate the performance of the devices. Experimental results show that the metal to be protected has different anti-corrosion effects depending on the distance from the anode of the device, but it is effective for the entire 120 cm long specimen exposed with one anode. The cathodic protection is effective because the conductive tape attached to the anode of the structure to be protected acts as a constant electrolyte in wet and dry conditions. The results show that the entire standard passenger car can be protected by cathodic protection with 4 anodes.

• 품질경영학회지
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• 제39권3호
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• pp.432-443
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• 2011

The purpose of this research is to understand users' information protection behavior on personal information security from health psychology theory perspectives. Empirical results indicate that users' information protection behavior on personal information is predicted by perceived threat and perceived responsiveness. Perceived threat is determined by perceived susceptibility and perceived severity. Perceived responsiveness is determined by response efficacy and self-efficacy, but response cost is not significant. These findings provide an enriched understanding about users' information protection behavior on personal information security.

• 전기학회논문지
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• 제58권8호
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• pp.1538-1543
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• 2009

The electric ballast for ceramic metal halide lamp needs a protection circuit to prevent from over voltage and over current in the case that the lamp or the electric ballast are in faults. In this paper, cost-effective and high performance protection circuit is proposed for the electric ballast. The proposed protection circuit is adapted to the electric ballast with $LC_SC_P$ resonance type half bridge inverter. The experimental results demonstrate that the proposed circuit can protect effectively under open and short fault conditions.