• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 A
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• pp.299-301
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• 2003

In this paper, a protection system using Multi-Agent concept for power distribution network is proposed. Multi agent system consist of Feeder agent, OCR(Over Current Relay) agent, Recloser agent and Switch agent. An agent calculates and corrects its parameter by itself through communication with neighboring agents and its own intelligence algorithm. Simulations in a simple distribution network show the effectiveness of the suggested protection system. Multi-Agent System, protection of distribution network, Communication.

• 조명전기설비학회논문지
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• 제27권12호
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• pp.74-80
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• 2013

Generator faults does not happen more often than the transmission and substation facility faults. However, impacts on the power system by generator faults are very large. In order to minimize the impact of generator faults, generator protection and control system with high reliability is required. Most of the generator relay in generator protection and control system of large power plant of Korea is operated by imports from abroad. Accordingly, in order to accumulate source technology and increase the import substitution effect, localization of multi-function generator protection IED is being developed. This paper deals with the implementation of a multi-function prototype IED H/W, which can be command and data exchange through communication for measuring, monitoring, protection and control. And the IED specification, various relay elements, measurement elements, communication functions, module function, and test system for the prototype IED H/W are described.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 추계학술대회 논문집
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• pp.308-327
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• 2004

As use of tunnels and subways increase there also are accidents proportionate to it. Daegu Subway Station fire, Hongjimoon tunnel fire led people to be conscious of disaster protection and as a result, there is a trend to adopt standards for fire protection. Accordingly, this thesis is focused on investigating various fire and water protection related issues for subaqueous tunnel under Ran river. The thesis developed evacuation and disaster prevention plan as fire level increases and have identified the suitability of disaster prevention through evacuation and fire simulation, countermeasure of a water leakage during construction and operation considering the subaqueous tunnel. And we selected EPB shield TBM equipment considering the ground condition and effect of boring hole, and accomplished reasonable water protection design through setting goals using event-tree method, as well as examining model test of boring hole and flooding in heavy rain. Also included structured total system consist of water leakage sensing system, water protection gate, pumping system and fire protection system to respond systematically in emergency.

• 대한안전경영과학회지
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• 제13권1호
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• pp.41-49
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• 2011

The automatic fire detection system is an important facility installed with focusing on minimizing the damage from a fire. This paper presents in the followings as the methods to reduce the false alarm of the automatic fire detection system; first, to prepare for legal standard so that revised legal standard can be applied to the fire fighting property prior to revision; second, to introduce the performance based fire detection protection design in the law based fire protection design; third, to maintain the wiring of worn-out detector; forth, to introduce an evaluation system to the education for the fire warden; fifth, to extend the standard of MTBF(meantime between failure) of the detector; sixth, to extend of installing the analog type detector; seventh, to improve the structure of reset switch.

• Journal of Power Electronics
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• 제10권6호
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• pp.777-783
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• 2010

In order to drive gas discharge lamps, DC-AC converters with a LCC resonant tank, whose output voltage is adjusted by a variable frequency control are frequently used. However, when they are activated by varying the operating frequency, converters are frequently damaged by unstable operation, due to the rising and falling of the operating frequency near the resonant frequency. To solve this problem, a simple protection circuit for the power supply of a gas discharge lamp is proposed in this paper. This circuit senses the primary current of the main transformer. Using this protection circuit, the operating frequency of the lamp driving inverter system is kept close to and on the right side of the resonant frequency and the inverter is always operated in the ZVS condition. The resulting stable variable frequency operation allows various gas discharge lamps to be tested without the risk of damaging the main switches, because the protection circuit can protect the power MOSFETs of bridge converters from abnormal conditions. The validity and effectiveness of the proposed protection circuit are verified through the experimental results.

• 한국컴퓨터정보학회논문지
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• 제23권11호
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• pp.185-191
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• 2018

The purpose of this study is to present effective basic data for business management through analysis of importance and performance of personal information protection of the elderly welfare center workers. For this purpose, the questionnaire on the protection of personal information was reconstructed based on the diagnostic level of the personal information security management level of the public institution and the questionnaire was conducted on 105 employees of the elderly welfare center in Chungbuk area. Based on the responses to the importance and the degree of performance of the personal information protection of the elderly welfare center employees, technical statistics and corresponding sample T-tests were conducted and the importance-performance analysis (IPA) was used. Followings are the results of this study: First, there is a statistically significant difference between the importance and the implementation of the management system for the protection of personal information of the workers in the elderly welfare center, establishment and implementation of protection measures, establishment and implementation of infringement measures. Second, IPA analysis on the protection of personal information of the workers in the elderly welfare center shows that the establishment and implementation of protection measures are the areas to maintain good performance. Third, in IPA analysis of the sub-factors of the personal information protection of the workers in the welfare center of the elderly, in the construction and management of the management system, in performing the role of the personal information protection officer and establishing and implementing protection measures, The factors of prevention of information disclosure and exposure and the safe use and management of personal information processing system were analyzed as areas requiring intensive improvement. This study is meaningful as a basic research that can raise the awareness of the personal information protection of the workers in the elderly welfare center and induce the improvement of the related work.

• 문화기술의 융합
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• 제8권6호
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• pp.515-522
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• 2022

본 연구는 독일의 아동학대 대응체계를 예방적 관점에서 분석하고, 우리나라에 적용가능한 함의점을 찾아보고자 하였다. 연구방법으로는 법적차원, 정책적 차원, 전문성 차원에서 분석틀을 제시하고 시사점을 도출하였다. 연구결과는 다음과 같다. 첫째, 독일 아동청소년지원법은 국가의 개입 이전에 가정의 역기능을 회복할 수 있도록 예방적 지원체계를 규정하였다. 둘째, 민법에 따라 가정법원이 조기개입이 가능하도록 규정하였다. 셋째, 연방아동보호법을 통해 아동학대 대응체계를 위한 지역사회 협력을 규정하였다. 넷째, 아동학대 대응체계의 책임기구인 청소년청은 예방적 지원과 개입이 동시에 가능하도록 하였다. 다섯째, 인력의 전문성을 위해 아동청소년지원법에 자격기준을 명시하고, 3년 이상 전담공무원에게 아동보호전문인력 자격을 부여한다. 시사점은 다음과 같다. 첫째, 아동학대 신고체계로 작동하는 아동학대 대응체계를 예방적 지원체계로 확대해야 한다. 둘째, 학대받은 아동을 위한 보호조치뿐만 아니라 잠재적 위험아동에 대한 지원체계를 확립하기 위하여 네트워크 간 조기경보체계를 시스템으로 구축하여 모니터링을 확대해야한다. 셋째, 아동과 부모가 가정의 어려움으로 인해 발생하는 역기능을 지방자치단체가 유연하고 포괄적으로 지원해야 한다. 넷째, 네트워크 협력체계를 위해 아동보호협력법의 제정이 필요하다.

• Journal of electromagnetic engineering and science
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• 제6권2호
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• pp.103-109
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• 2006

This paper suggests an efficient and comprehensive algorithm of the protection ratio derivation and illustrates some calculated results applicable to the initial planning of frequency coordination in the fixed wireless access networks. The net filter discrimination associated with Tx spectrum mask and overall Rx filter characteristic has been also examined to show the effect of the adjacent channel interference. The calculations for co-channel and adjacent channel protection ratios are performed for the current microwave frequency band of 6.7 GHz including Tx spectrum mask and Rx filter response. According to results, fade margin and co-channel protection ratio reveal 41.4 and 75.2 dB, respectively, for 64-QAM and 60 km at BER $10^{-6}$. It is shown that the net filter discrimination with 40 MHz channel bandwidth provides 28.9 dB at the first adjacent channel, which yields 46.3 dB of adjacent channel protection ratio. In addition, the protection ratio of 38 GHz radio relay system is also reviewed for millimeter wave band applications. The proposed method gives some advantages of an easy and systematic extension for protection ratio calculation and is also applied to frequency coordination in fixed millimeter wave networks.

• 한국통신학회논문지
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• 제15권7호
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• pp.545-552
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• 1990

본 논문은 화일전송 시스템에서 데이터 보호방법에 대하여 연구 하였다. 기존의 화일전송 시스템에서는 보호기법으로 시스템 사용 권한통제(password) 및 파일 접근통제방법(ACL)이 사용되고 있지만 데이터 자체 보호는 하지 못하고 다만 허가되지 않은자의 접근을 통제하여 준다. 이러한 보호기법을 컴퓨터 침입자로 하여금 많은 위협을 받고 있다. 제안된 시스템 구성은 높은 수준의 비밀유지보호(데이터 자체보호, 송신자 인증 등)를 위하여 화일전송에서 공개키 방법 중 RSA 암호방식을 사용하여 최상의 비밀유지를 이룩할 수 있고 또한 이방법을 데이타 베이스에서 처럼 여러가지 문서취급에 쉽게 적용할 수 있는 새로운 대체 시스템에 대하여 연구 하였다.

• 대한공간정보학회지
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• 제19권1호
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• pp.45-52
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• 2011

이 연구는 U-City기반시설보호를 위한 관련 법제도의 정비 방향을 제시하는데 목적이 있다. 이를 위해 해외 기반 시설보호체계와 국내의 U-City법을 비롯한 관련 법제도에 대해 분석하고, 산 학 연 전문가를 대상으로 설문조사를 수행하여 U-City기반시설보호와 관련된 문제점을 도출하였다. 이를 바탕으로 U-City기반시설보호를 위한 관련 지침 제정, U-City기반시설보호 의무화, U-City기반시설보호를 위한 전담조직 구성, 지능화된 시설 보호를 위한 관련 법제도 개정 및 U-City기반시설보호 보호시스템 구축 등의 U-City기반시설보호를 위한 법제도 정비방향을 제시하였다.