• 시큐리티연구
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• 제38호
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• pp.83-107
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• 2014

학교 안전망 구축 사업의 일환으로 현재 실시되고 있는 서울시 학교보안관제도와 그 외 지역의 배움터 지킴이 사업이 점진적으로 개선되고 있다고는 하지만 지속적으로 발생하는 학교 내 및 주변의 범죄 문제는 쉽게 해결되지 않고 있음을 본 연구에서 알 수 있다. 따라서 학교안전망 구축 사업의 효과적인 개선방안으로는 다음과 같다. 첫째, 직업성 전문성 강화를 위한 제도적 뒷받침으로 학교 안전에 관한 전문인력 양성 및 교육을 위한 준교사급의 학교안전교사 제도를 시행해야 한다. 둘째, 범죄로부터 안전할 수 있는 환경조성을 위한 학교 안전 CPTED의 법적제정을 통해 학교 안전망 구축 사업을 실시할 것을 제시하고 있다. 따라서 본 연구는 학교 안전망의 실태 및 문제점을 알아보고 임시방편적인 학교안전대책이 아닌 체계적이고 계획적인 학교안전대책방안으로 학교안전교사제도와 CPTED의 법적 제정을 제시하고자 한다.

• ETRI Journal
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• 제45권6호
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• pp.1065-1078
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• 2023

In vehicular networks, diverse safety information can be shared among vehicles through internet connections. In vehicle-to-internet communications, vehicles on the road are wirelessly connected to different cloud networks, thereby accelerating safety information exchange. Onboard sensors acquire traffic-related information, and reliable intermediate nodes and network services, such as navigational facilities, allow to transmit safety information to distant target vehicles and stations. Using vehicle-to-network communications, we minimize delays and achieve high accuracy through consistent connectivity links. Our proposed approach uses intermediate nodes with two-hop separation to forward information. Target vehicle detection and routing of safety information are performed using machine learning algorithms. Compared with existing vehicle-to-internet solutions, our approach provides substantial improvements by reducing latency, packet drop, and overhead.

• 전기학회논문지
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• 제66권9호
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• pp.1373-1378
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• 2017

This paper presents a basic ECU(Electronic Control Unit) hardware development procedure for the functional safety of in-vehicle network systems. We consider complete hardware redundancy as a safety mechanism for in-vehicle communication network under the assumption of the wired network failure such as disconnection of a CAN bus. An ESC (Electronic Stability Control) system is selected as an item and the required ASIL(Automotive Safety Integrity Level) for this item is assigned by performing the HARA(Hazard Analysis and Risk Assessment). The basic hardware architecture of the ESC system is designed with a microcontroller, passive components, and communication transceivers. The required ASIL for ESC system is shown to be satisfied with the designed safety mechanism by calculation of hardware architecture metrics such as the SPFM(Single Point Fault Metric) and the LFM(Latent Fault Metric).

• 한국산학기술학회논문지
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• 제18권5호
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• pp.125-132
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• 2017

차량 안전 서비스는 무선 환경에서 차량 간 통신(Vehicle-to-Vehicle, V2V)을 통하여 운전 중 발생할 수 있는 위험을 사전에 감지하여 운전자에게 알려줌으로써 교통사고와 교통 체증을 줄이는 서비스이다. 차량 안전 서비스를 위해서 차량은 안전 메시지(Basic Safety Message, BSM)를 주기적으로 브로드캐스트 한다. 하지만, 차량 밀집 지역에서 이는 과도한 네트워크 트래픽의 원인이 되고 안전 메시지의 전송실패 확률과 지연을 급격하게 증가시켜 차량 안전 서비스의 안정성을 떨어뜨린다. 본 논문에서는 차량 안전 서비스를 수행하는 과정에서 발생하는 통신 혼잡 문제를 해결하기 위해 Channel Busy Ratio와 차량 수 간의 관계를 수식적으로 근사하고 이를 이용하여 전체 네트워크 혼잡도를 추정한다. 그리고 이를 기준으로 송신전력을 제어하는 새로운 상황인지 기반 송신전력제어 알고리즘을 제안한다. 제안하는 알고리즘은 네트워크 시뮬레이터인 Qualnet을 이용하여 성능평가를 하였고 그 결과, 전체 네트워크 혼잡도의 추정이 특정 시나리오에서 정확하게 근사 되었으며 송신전력제어를 통해 차량 안전 통신 간 패킷 에러율이 감소한 것을 확인할 수 있었다.

• 대한안전경영과학회지
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• 제11권3호
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• pp.63-71
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• 2009

Safety is totally established through not only legal regulations and system but the establishment of safety culture. As a foundation of safety culture, safety and health communication is the essential condition. Therefore, in the case of researching safety culture the communication network of a organization is a crucial factor. This study has analysed the structure of occupational safety and health communication between domestic and foreign corporations comparatively by the statistical analysis. The occupational safety and health communication is composed of four sub-dimensions: general communication in working site, using safety information communication, communication with the board of directors, and communication with labor union. The nationality of corporations influences the safety communication significantly except for communication with labor union. Consequently it is possible to infer that the nationality of corporations is a significant factor for safety communication network.

• 한국안전학회지
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• 제29권1호
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• pp.1-6
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• 2014

With increasing number of citizen using subway stations everyday, safety, health and comfort of passengers and occupants became an important social issue. Considering the fact that various physical variables and pollutants are related to indoor air quality (IAQ) which may cause health problem, IAQ need to be closely monitored and controlled in multiple locations in subway stations. This study is a continuation of the previous studies and delay induced in wireless-wired network is experimentally evaluated and the risk involved is assessed. In doing that, a key parameter is identified to be the network delay in different network media. Application of information-theoretic measure to assess the risk in network delay is then discussed. The idea is based on the general principles of engineering design and their applications to quantification of uncertainty in network delay. Experimental results show that more risk is involved in wireless data communication. Efficient and fast conversion of transmission data in both LonWorks/IP server and ZL converter is also noted.

• 전기학회논문지
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• 제61권6호
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• pp.859-864
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• 2012

The computer network plays an important role in modern digital controllers within a safety system of a nuclear power plant. For the reliable and realtime data communication between controllers, this paper proposes a modified high-reliable MVB(multi-function vehicle bus) as a main control network for a safety system of a nuclear power plant. The proposed network supports the state-based communication in order to ensure the deterministic communication latency, and very fast network recovery when the bus master fails compare to the standard MVB. This paper also shows the implementation results using a FPGA-based testbed.

• 정보통신설비학회논문지
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• 제9권3호
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• pp.102-106
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• 2010

Recently process industries from oil and gas procedures and mining companies to manufactures of chemicals, foods, and beverages has been exploring the USN (Ubiquitous Sensor Networks) technology to improve safety of production processes. However, to apply the USN technology in the large-scale plant industry, reliability and security issues are not fully addressed yet, and the absence of the industrial sensor networking standard causes a compatibility problem with legacy equipment and systems. Although this situation, process industry such as energy plants are looking for the secure wireless plant solution to provide detailed, accurate safety monitoring from previously hard-reach, unaccordable area. In this paper, SPSF (Smart Plant Safety Framework based on Reliable-Secure USN) is suggested to fulfill the requirements of high-risk industrial environments for highly secure, reliable data collection and plant monitoring that is resistant to interference. The SPSF consists of three main layers: 1) Smart Safety Sensing Layer, 2) Smart Safety Network Layers, 3) Plant Network System Layer.

• 대한안전경영과학회지
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• 제5권3호
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• pp.179-197
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• 2003

Since 1991, so many women's volunteer centers have established in local self governing body or several women's organizations. The aims are to promote and manage women's volunteer activities. For last 12 years, one of aims has been already attained. But the other one is beyond attainment, because there are few network system among women's volunteer centers. For more efficient management of volunteer activities, it is necessary to construct computer network system in every volunteer center. In this paper, we describe current network situation and suggest network construction method of women's volunteer centers.

• Safety and Health at Work
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• 제3권4호
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• pp.278-286
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• 2012

Objectives: Authors investigated the pattern of the rate of occupational injuries and illnesses (ROII) at the level of enterprises in order to build a network for exchange of experience and knowledge, which would contribute to workers' safety and health through safety climate of workplace. Methods: Occupational accidents were analyzed at the manufacturing work site unit. A two step clustering process for the past patterns regarding the ROII from 2001 to 2009 was investigated. The ROII patterns were categorized based on regression analysis and the patterns were further divided according to the subtle changes with Mahalanobis distance and Ward's linkage. Results: The first clustering of ROII through regression analysis showed 5 different functions; 29 work sites of the linear function, 50 sites of the quadratic function, 95 sites of the logarithm function, 62 sites of the exponential function, and 54 sites of the sine function. Fourteen clusters were created in the second clustering. There were 3 clusters in each function categorized in the first clustering except for sine function. Each cluster consisted of the work sites with similar ROII patterns, which had unique characteristics. Conclusion: The five different patterns of ROII suggest that tailored management activities should be applied to every work site. Based on these differences, the authors selected exemplary work sites and built a network to help the work sites to share information on safety climate and accident prevention measures. The causes of different patterns of ROII, building network and evaluation of this management model should be evaluated as future researches.