• 정보보호학회논문지
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• 제22권1호
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• pp.107-115
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• 2012

우리나라의 정보화 수준과 비교하여 정보보호 수준은 상대적으로 낮다. 정보보호 예산 수준 역시 전체 정보화 예산대비 5%대로 미미하며 기업들의 사후대응 중심의 정보보호 조치는 반복적인 피해비용을 야기한다. 정보보호 침해사고에 대한 대응은 사후대응 체계에서 예방과 사전탐지 중심으로 바뀌어야한다. 정보사회에서의 침해사고 대응은 개인의 책임보다는 국가와 기업이 공동으로 대처해야할 영역이라는 인식 전환이 필요하다. 2004년 정보보호조치 및 안전진단 관련 지침이 고시되면서 우리나라도 침해사고 예방을 위한 제도적 기반을 마련하였다. 하지만 제도적으로 시행되고 있는 관리적, 기술적, 물리적 보호조치가 실제 침해사고 대응에 완벽한 예방책이 되지는 못한다. 본 연구에서는 현행 제도적 보호조치의 예방 효과에 대해 살펴보고 제도적 한계와 개선점을 도출하여 기업들이 실질적인 목표 보안수준을 유지하기 위해 필요한 효과적인 침해 예방 대응책으로써의 선행위협 관리 모델을 제안한다.

• 한국화재소방학회논문지
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• 제23권3호
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• pp.23-30
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• 2009

건물의 소방설비시스템의 유지 관리 상태에 이상이 나타났다고 한다면, 특정 기능의 이상이 미치는 부분적 또는 전체적인 화재안전대응수준에 영향을 미친다. 따라서 효율적 소방성능을 유지하기 위해 설비기능의 가동상태를 나타 낼 수 있는 성능지수의 계산 체계가 필요하다. 이러한 성능지수의 체계는 정보수신자가 부분 이상으로 발생한 영향이 전체 기능의 상태에 얼마나 영향을 주는 것인지를 쉽게 인지할 수 있도록 하는 데에 기여할 수 있다. 따라서 건물의 화재안전수준을 나타내는 효율지표로 사용될 수 있을 뿐만 아니라, 광대역규모의 소방 관리에서도 활용성 높은 지수로 사용될 수 있다. 본 지수 산정체계는 U-건물 소방방화시설관리 운용시스템의 성능 효율지수 산정을 위한 시스템으로 개발되었다.

• 환경위생공학
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• 제3권2호
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• pp.43-60
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• 1988

This study was carried out to determine traffic noise level and analyze noise reduction effects of various sound protection facilities in the area of Seoul, Inch'on, Songchoo and Seoul- Busan Expressway from March to Octover, 1987. The results were as follows; 1. As compared with the environmental standards and the traffic noise level in heavy noise areas, traffic noise levels observed were shown in higher than environmental standards. The noise levels in Seoul were determined at 12.8-18.2 dB(A) in daytime and 19.0-26.9 dB (A) in nighttime. And incase of inch'on, it were 6.7-9.6 dB(A) in daytime, 7.9-18.9 dB(A) in nighttime, respectively. 2. The environmental noise level observed in the backside of protection facilities, such as apartment, soundproof barrier and houses, which were constructed in paralled to the road was lower about 3-5 dB(A) than perpendicular to theroad. Noise recuction effect of upper stairs in apartment was higher than lower stairs. 3. The predicted noise level obtained from the equation $({\triangle}L\;=\; -10\;log\;(^{I'1}/Ii)\;was\;\pm\;1dB$ (A) and the correlation coefficient (r) was 0.923. 4. The noise reduction effect in backside of apartment was measured at on sites and predicted by total noise loss equation. The predicted noise level was 60.9 dB(A) and the measured level was 60.6 dB(A), respectively. 5. The narrow width landscape less than 10m width was almost no effect for the protection of traffic noise. According to the synthesis of the above results, the noise level of the road was exceeding mostly the environmental standard in the heavy traffic areas. The counterplan should be set as well. The insulation of noise protection facilities were effective by the location with near distance from the road edge. The reduction effect of double window in apartment was represented so much. The prediction model could be applied to estimate the noise levels in the roadside as well as the effectiveness for the noise protection facilities.

• Journal of Radiation Protection and Research
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• 제1권1호
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• pp.37-41
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• 1976

The background, beginnings and course of development of the radiation protection profession are outlined. Emphasis is on developments in the Western world, particularly the USA. It is shown that this profession has played a major role in producing a level of safety that would have been unbelievable a few decades ago.

• Journal of Electrical Engineering and Technology
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• 제12권2호
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• pp.950-958
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• 2017

Viaduct increases the height of subway catenary, namely magnifies lightning attraction scope that lead to higher possibility of suffering lightning stroke. Therefore, it is necessary to analyze performance of lightning striking to catenary of subway in viaduct section and propose an improving lightning protection scheme. In this paper, using ATP-EMTP simulation software to establish an associated model to evaluate lightning withstand level of catenary with existing lightning protection schemes including arrester and grounding point, an improving lightning protection scheme is proposed - every pillar ground earth and arresters are installed with some installing spacing between 200m to 400m based on lightning damage degree and reliability requirements - according to analyzing results: while lightning withstand level is lowest for lightning striking to the neutral pillar, lightning withstand level is greatest for lightning striking to the both-ends pillar that arrester and grounding point are both installed; grounding point could obviously improve lightning withstand level for lightning striking to ground wire while arrester could obviously improve the lightning withstand level for lightning striking to catenary; every pillar ground earth could enhance the lowest lightning withstanding level up to 2.5 times than of that pillar ground earth across every 200m.

• 조명전기설비학회논문지
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• 제26권12호
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• pp.21-27
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• 2012

Korean Industrial Standards for lightning protection system complies with IEC standards. However, the standards are applicable only to buildings and structures more than 20 meters in high. Therefore, it is necessary to determine whether lightning protection system should be installed on structures lower than 20 meters high. This paper proposes an efficient method of assessing risk against lightning of structures lower than 20 meters high. The method suggests simplified lightning protection system and provides selecting an appropriate protection level. The suggested method assumes that structure under assessment has no lightning protection system and there is no person around the structure at the moment of lightning stroke. A simplified method of assessing the risk to human within the structure is developed by adopting the general assessment factor. The selection of a protection level is possible by comparing tolerable risk with physical damage risk caused by a direct lightning. Finally, this paper gives ways to establish surge protection measures when a structure with lightning risk is within a radius of 2km from the assessed structure even if this structure requires no lightning protection system.

• 한국화재소방학회:학술대회논문집
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• 한국화재소방학회 1997년도 International Symposium on Fire Science and Technology
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• pp.423-438
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• 1997

Today's building and fire prevention codes are mostly prescriptive. Prescriptive codes are based on major fires in earlier years that created a need for specific building provision. These codes provide a minimum level of safety. As the general and engineering uses of computers have increased over the years, so has use of computers in the fire protection engineering. This has allowed fire protection engineers to develop alternative approaches to solve today's fire protection problems or to evaluate the performance of a specific fire safety goal. A performance based approach to building and fire codes involves the following: 1) identifying specific goals, such as, safely getting out of the building in 10 minutes, 2) obtain conceptual approval from authorities, 3) define performance level, 4) develop design solutions and identify tools such as, fire tests, models, or methods, to demonstrate that a design will meet the fire protection objective 5) test solutions, 6) present test method and results to the authorities. Some people in the fire protection community consider this to be nothing more than an intellectual exercise, while the others view it as a way to reduce expenses on large project$^4$ Others in fire protection community view this as a way to refine the design process to design fire protection systems to better protect the fire hazards. This paper will focus on application of these tools, specifically computer fire models, to actual cases such as: design of a smoke control system heat transfer analysis and egress of building occupants during potential fires.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 하계종합학술대회 논문집 V
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• pp.2859-2862
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• 2003

본 논문에서는 과전류로부터 보호해야 할 트랜지스터의 정격전력을 고려해 protection level 을 결정하는 과 전류 보호회로를 제안하였다. 기존의 과전류 보호회로는 과부하시 출력 트랜지스터 양단 전압과는 무관하게 단순히 전류의 크기만을 감지해 보호회로를 동작시키기 때문에 출력 트랜지스터의 정격전력을 고려하지 않고 동작을 한다. 하지만 제안된 회로는 출력전압과 출력전류의 크기를 모두 감지해 protection 여부를 결정하기 때문에 protection 시 출력 트랜지스터에서의 소모전력이 거의 일정하도록 유지시켜준다. Protection level 설정에 있어서 기존 방식과 다른 점을 먼저 살펴보고, 실제 오디오 증폭기의 보호회로로 사용된 회로의 동작원리를 설명하겠다. 아울러 실험을 통해 검증된 과전류 보호회로의 동작 결과를 살펴보겠다.

• 조명전기설비학회논문지
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• 제27권2호
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• pp.29-35
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• 2013

For the purpose of designing and applying optimum surge protection, one of the essential points is to take into account the energy coordination between cascaded surge protective devices(SPDs) and it is important to obtain an acceptable sharing of the energy stress between two cascaded SPDs. In this paper, in case of two voltage-limiting SPDs connected in parallel, the amount of splitting impulse current and energy that flow through each SPDs is investigated as a function of the protective distance. As a result, the energetic coordination between cascaded SPDs is strongly dependent on the voltage protection level of SPDs and the protective distance. It was confirmed that the sharing of the energy between two cascaded SPDs and the limited voltage levels are appropriate when the voltage protection levels of both upstream and downstream SPDs are the same.

• 한국산학기술학회논문지
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• 제22권3호
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• pp.671-678
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• 2021

2020 국방기술통제목록 연구는 기술보호 등급분류 설정 시 전문가 의견을 수렴하여 조사항목 설정, 등급분류 기준 설정 방법으로 정성적 기준에 의존했다. 이를 보완하여 기술보호 등급분류 설정의 정량적 기준을 제시하고자 본 연구를 수행했고, 본 논문에서는 통계기법을 적용한 기술보호 등급분류 설정 방법론을 제시하였다. 연구절차는 3단계로 진행하여 조사항목 설정, 기술보호 등급분류의 당위성을 입증하고자 하였다. 첫째, 판단지표를 선정하기 위해 2020 국방기술통제목록 작성 시 조사되었던 6개 조사항목, 즉 요소기술의 상대기술수준, 체계구현관점중요도, 국가안보관점중요도, 난이도, 기술이전기피, 파급효과에 대한 통계적 분석, 신뢰도 검증을 수행하여 조사항목을 설정하였다. 둘째, 선정된 조사항목을 AHP기법으로 계층화하여 전문가 설문조사를 수행하고 의견을 점수화했다. 도출된 조사항목의 가중치를 이용하여 요소기술의 점수를 산출했다. 마지막으로 정규분포 산포도와 사분위수 산출 방식, 카플란마이어 추정치 비율을 연계하여 3단계 등급설정을 하고, 723개 요소기술 점수의 카플란마이어 추정치값에 적용하여 기술보호등급을 3단계 기준점수를 제시하였다. 본 연구를 통해 설정된 등급설정표를 이용하여 일관성 있는 객관적인 기준을 제시할 수 있을 것이라 판단된다.