• The Transactions of the Korean Institute of Electrical Engineers P
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• v.58 no.2
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• pp.95-100
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• 2009

Recent advances in computer technology have brought more dependence on software to railway systems. Hence, the safety assurance of the vital software running on the railway system is very critical task and yet, not many works have been done. While much efforts have been reported to improve electronic hardware's safety, not so much systematic approaches to evaluate software's safety. In this paper, we suggested an automated analysis tool for S/W change impact in railway system, and presented its result of implementation. The analysis items in the implemented tool had referred to the international standards in relation to the software for railway system, such as IEC 61508 and IEC 62279. In these international standards, 'change impact analysis' for railway system S/W has to be required mandatorily. The proposed tool can be utilized at the assessment stage and also the software development stage.

• Journal of the Korea Safety Management & Science
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• v.23 no.4
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• pp.23-29
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• 2021

The purpose of this study is to reduce the probability of occurrence of electric fires as a preemptive preventive measure, and to strengthen the capability of preventing electric fires by strengthening the cooperative function between electric fire-related departments and establishing a cooperative system. In this study, the general aspects of electric fires were identified by reviewing the literature such as ignition mechanisms of electric fires. And the major electrical fires that occurred in the last 10 years were classified into ignition factors (short circuit, overload/overcurrent, and earth leakage/ground fault) and ignition sources (wiring/wiring appliances, electrical equipment/household appliances). And the 4M technique was used to analyze the potential causes of ignition at the fire site and to suggest preventive measures. In the case In this study, out of 48 electrical fires in the past 10 years, 16 short-circuit fires, 3 overload/overcurrent fires, 3 short-circuit and earth fault fires, 16 fires in wiring/wiring appliances, and 10 fires in electrical equipment/home appliances classified as cases. And prevention measures were presented in terms of human, machine, media, and management by using the 4M technique. For the preemptive prevention of electric fires, strengthening the compulsory electrical safety inspection and making it mandatory to report when new or expanding electric facilities, charging a fee for electric safety inspection for detached houses and granting benefits subject to inspection completion, improvement of the electric safety voluntary inspection table and safety indications; It was suggested as a policy to organize and operate electrical safety inspection personnel in a two-person team (mixed), establish a close work cooperation system with related organizations, and strengthen electrical safety education and publicity.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.2170_2171
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• 2009

비상용 예비전원설비는 정전이 되었을 경우 건축물의 기능 유지나 영업을 위해 최소한의 방재와 비상전력을 확보하기 위한 설비이다. 그러나 최근 부하운전시험으로 발전기 가동시 부하단의 콘덴서, 고조파, UPS와 같은 SCR 부하의 영향으로 발전기 전원측에서 이상전압이 발생하여 과전압이 부하에 공급되어 기기가 소손되는 사고가 빈번히 발생하고 있다. 본 논문에서는 국내의 국내 예비발전설비의 운용 현황과 발전기 보호시설 유무에 대한 실태조사를 하였고, 최근 10년간 발전기 관련 사고 사례를 조사하여 사고의 원인을 분석하였다. 또한 발전기의 부하운전시 발전전원측의 전원품질을 측정하여 향후 사고해석 SW를 이용하여 시뮬레이션 및 사고재연 실증시험을 통해 보다 정확한 사고원인 및 사고발생 대책을 제시하는데 자료로 이용 될 것이다.

• Proceedings of the KIPE Conference
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• 2008.06a
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• pp.583-585
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• 2008

전기설비에서 전기안전을 확보하기 위해 전기설비의 전압, 전류, 절연저항, 누설전류 등을 직접 측정하고 관리하려면 시간과 비용이 많이 소요된다. 최근 전력 IT기술들의 발전과 활용이 증가하고 있는데 이러한 기술들을 전기설비 전기안전 관리에 적용할 경우 운영 및 유지보수의 효율성과 전기안전을 확보할 수 있다. 따라서 전기설비의 효율적인 관리와 전기안전을 확보하기 위한 전력 IT 기반 전기안전감시시스템을 설계하여 활용하고자 한다.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.2078-2079
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• 2007

국내 및 국외에서도 마찬가지로 전기설비 안전점검에 대한 부분이 발전된 정보통신 기술(IT : Information Technology)에 접목 시켜 실시간으로 서비스를 제공하는 추세에 있다. 따라서 전기설비와 관련 된 전기안전 부가서비스의 활성화를 위한 방향과 새로운 고부가 비즈니스 사업 창출을 위해서 어떤 부분에서 개선 및 추가 되어야 할 부분인지에 대하여 본 논문에서 제시 하고자한다. 따라서 전력 부가 서비스의 활성화 방향에 대하여 실시간 원격 점검의 필요성, 사용자 및 전기안전 관리자의 인센티브, 전력 부가서비스로 제공할 수 있는 범위에 관하여 조사 분석 하였다.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.65 no.5
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• pp.895-901
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• 2016

Nowadays, the axle counter has been developed to the wide range of the track circuit blocks as well as the wheel detection device. The axle counter, as becoming an important device for the high speed railway, must be guaranteed in accordance with the safety. With considering the safety and the high speed, performance evaluation a wheel detection sensor is described in this paper. To increase the safety, digital proximity sensor instead of analog is employed in the wheel detection sensor. Therefor the wheel detection sensor can minimize noisy signals caused by the harsh railway environments. And, to meet the high speed railway requirements, the performance of the wheel detection sensor is also successfully verified using the speed simulator at the velocity 500Km/h.

• Proceedings of the KIEE Conference
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• 2009.04a
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• pp.211-212
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• 2009

This Paper present about loop impedance measuring method by a comparison & analysis of the earthing systems in IEC60364. And comparing analysis about only considering a resistance and considering resistance & inductance. Result, For measuring of loop impedance than must measured resistance and reactance. And TT earthing system was lower fault current then TN systems, but an electric shock was higher then TN systems.

• Journal of Electrical Engineering and Technology
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• v.12 no.2
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• pp.959-968
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• 2017

Electrical safety monitoring System (ESMS) is a critical component in modern power systems, which is characterized by large-scale access points, massive users and versatile requirements. For convenience of the information integration and analysis, the software development, maintenance, and application in the system, the cloud platform based ESMS is established and assessed in this paper. Firstly the framework of the system is proposed, and then the assessment scheme with a set of evaluation indices are presented, by which the appropriate cloud product can be chosen to meet the requirements of a specific application. Moreover, to calculate the weights of the evaluation indices under uncertainty, an improved interval AHP method is adopted to take into consideration of the fuzziness of expert scoring, the qualitative consistency test, and the two normalizations in the process of eigenvectors. Case studies have been made to verify the feasibility of the assessment approach for ESMS.

• Product Safety
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• no.10 s.154
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• pp.48-49
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• 2006

"설립 후 계속적으로 쌓아온 독자적인 노하우를 기반으로 21세기 편리하고 안전한 Home Network System사업에 주력하고 미국, 중국, 일본 등 세계 여러 나라에 수출하는 글로벌 마케팅 강화에 핵심역량을 모으고 있습니다. 디지털 첨단 기술 개발을 위해 적극적인 연구개발 및 투자를 아끼지 않는 기업, 코콤의 제품들은 곧 품질보증이라는 사명감으로 고객만족에 정성을 다하는 기업, 성장 잠재력이 크고, 경쟁력 있는 건강한 기업이 되도록 최선의 노력을 하겠습니다."

• Journal of Korea Multimedia Society
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• v.23 no.2
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• pp.351-360
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• 2020

If various unreasonable safety standards are preemptively and effectively readjusted, the risk of accidents can be reduced. In this paper, we proposed a machine reading comprehension-based safety standard Q&A system to secure supporting technology for effective search and analysis of safety standards for integrated and systematic management of safety standards. The proposed model finds documents related to safety standard questions in the various laws and regulations, and then divides these documents into provisions. Only those provisions that are likely to contain the answer to the question are selected, and then the BERT-based machine reading comprehension model is used to find answers to questions related to safety standards. When the proposed safety standard Q&A system is applied to KorQuAD dataset, the performance of EM 40.42% and F1 55.34% are shown.