• The Journal of the Korea institute of electronic communication sciences
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• v.10 no.10
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• pp.1079-1086
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• 2015

This paper introduces the architecture of OUTPUT module that is suitable using in safety related system having SIL4 and proposes the quantitative target that is required for OUTPUT module. Especially, only output type that is made up Relay output signal and analog signal among various output ways is applied in output module that is a part of safety related system. The FMEA(Failure Modes and Effect Analysis), FTA(Fault Tree Analysis) are used as analysis method. As a result, it proposes to the architecture and failure frequency of the Output module that is used in SIL4 safety related system.

• Journal of the Ergonomics Society of Korea
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• v.29 no.4
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• pp.479-486
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• 2010

Automobile-related industries have been a few of leading ones among domestic industries reporting high rates of musculoskeletal disorders (WMSD's). In this paper, major ergonomic aspects of automobile-related works were reviewed with reference to WMSD's. According to the result, high repeatability of works with as short as 1 minute or less, awkward postures required, excessive forces, and vibrations due to power tools were drawn out as major physical factors. To eliminate or mitigate those factors - at least in automobile-related industries - ergonomic approach has tried for more than a decade. With all, however, ergonomists still seem to confront with several problems to be solved such as development of appropriate assessment tools, enhancement of work improvement activities, system establishment for continuous prevention and management of WMSD's. As lots of previous researches declared, it was concluded that ergonomic approach would collaborate with other approaches such as ndustrial medicine considering physical factors as well as psychosocial factors, and that the necessity of an integrated Occupational Safety and Health Management System(OHSMS) was mentioned.

• Journal of the Korean Society of Safety
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• v.18 no.3
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• pp.149-153
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• 2003

Recently, work-related musculoskeletal disorders(WMSDs) are one of major issues in occupational safety and health in Korea. Main risk factors of WMSDs include manual handling of heavy weight loads, awkward posture, repetitive tasks, Prolonged static muscle contraction, and so on. The number of injured workers has rapidly increased and the related regulation was amended to improve the work conditions and environments. And demands for workers' compensation and improvement of work conditions and environment to prevent WMSDs have increasingly been raised. This study focused on managerial system to prevent WMSDs. Literal survey and questionnaire survey were accomplished to propose a management system in Korea for preventing WMSDs.

• Journal of the Korean Society of Safety
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• v.38 no.1
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• pp.70-77
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• 2023

Gas has replaced coal or petroleum as primary fuel because of its convenience. However, gas has risk of fire, explosion, or poisoning. To reduce gas-related accidents, many strategic projects have been being carried based on 'Gas Safety Management Basic Plans' on a domestic scale. In spite of those projects, the gas-related accident rate did not decrease over past decades. Thus, this study was conducted to analyze the effectiveness of ongoing projects, and to find out ways to make improvements. Conventional statistical analyses on accident data published by gas-related institutions were not useful to determine meaningful attributes to predict future. Whereas, accident case analyses adopted in the present study discovered differences in the type of people and their unsafe acts for each gas type. Meanwhile, the overall average priority of projects was not high in the aspect of System Safety Precedence. If the current trend is maintained, with sigmoid functions, it can be estimated that mean annual accident rate will decrease by only 2.0% in the next two decades. To improve the current trend, the present study made conclusions as followings: (1) safety projects should be designed with careful consideration of accident traits including gas type, unsafe acts, and persons involved and (2) alternative strategies should include system considerations such as minimum hazard design and safety devices prior to mere education or training. To summarize briefly, the present state related with gas accidents highlights the necessity of a system-based multidisciplinary approach.

• Journal of Aerospace System Engineering
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• v.7 no.2
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• pp.29-34
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• 2013

Safety requirements for aircraft and system functions include minimum performance constraints for both availability and integrity of the function. These safety requirements should be determined by conducting a safety assessment. The depths and contents of aircraft system safety assessment vary depending on factors such as the complexity of the system, how critical the system is to flight safety, what volume of experience is available on the type of system and the novelty and complexity of the technologies being used. Requirements that are defined to prevent failure conditions or to provide safety related functions should be uniquely identified and traceable through the levels of development. This will ensure visibility of the safety requirements at the software and electronic hardware design level. This paper has prepared to study on promoting the efficiency of establishing hierarchical safety requirements from aircraft level function to item level through system safety processes.

• Proceedings of the KSR Conference
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• 2005.11a
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• pp.575-580
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• 2005

In this study, safety requirement & criteria for high-speed rail system were developed for safety verification as a national rules and regulations. Safety criteria were presented through analysis of high-speed rail development specification, survey of related regulations for safety requirements. and review of operation compatibility with domestic rail system. Finally, safety rule consist of system safety requirements and safety criteria for technical parts.

• Proceedings of the KIEE Conference
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• 1998.07c
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• pp.1170-1172
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• 1998

The electrical power of nuclear power plant consists of Safety related power systems and Non-Safety related power systems. The safety related power systems are designed to have sufficient capacity to safely shut down the unit and to mitigate the effects of an accident assuming loss of off-site power. This paper presents the operation scheme of the safety related power system for several plant conditions in Korean Next Generation Reactor and reviews the diversity of power supply to the safety related bus.

• Journal of the Korea Safety Management & Science
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• v.19 no.2
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• pp.41-50
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• 2017

Disaster and safety budget can be characterized as a large-scale public asset on which the government has a significant role. It is of a crucial importance to properly allocate the limited national budget to various areas as necessary. Higher investment efficiency of the budget related to disaster and safety management requires distribution criteria based on relevance and efficiency. Currently, the budget related to disaster and safety management is orchestrated through the prior consultation system. However, there is still no clear framework for reviewing the investment direction and setting the priority investment areas by prior consultation. This study analyzes the status and characteristics of disaster and safety management projects by damage type and proposes a structured system for prioritization. This framework can be useful in selecting the areas that need priority investments by damage type of disaster and safety management projects, thereby contributing to improving investment efficiency.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.63 no.12
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• pp.1637-1639
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• 2014

In the past, the analog protection relays have been widely used for the safety-related systems in the nuclear power plants due to their stability and reliability. Meanwhile, as the high performance digital system has been developed, the digital systems have been adopted in the non-safety systems. However, since the digital systems currently used in the non-safety systems were not developed according to Q-class standard, Commercial Grade Item Dedication (CGID) procedure should be performed in order to apply them to the safety-related system. The purpose of this paper is to describe the CGID procedure including the analysis of the hardware architecture as well as the software embedded in protective relay to apply to the emergency diesel generator in the nuclear power plant. The entire CGID procedure was performed strictly according to the international standard and regulations.

• Proceedings of the KSR Conference
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• 2011.10a
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• pp.2517-2526
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• 2011

As technologies are developed and systems are complicated, hazards embedded in the system are also increasing. proving safety and managing the safety is more scientific and organizational domain so that safety management system is pursuing to be active formation detecting the factors of hazard and managing them beyond passive-way. In the future, in order to establish and manage national safety management system, it is important to have effective system and manage it and also more important that all the people related to target system has to change their recognition and to play roles in it.