• Safety and Health at Work
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• 제7권3호
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• pp.237-243
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• 2016

Background: This study examined the relationship between interhandle distances and upper limb exertion during simply pushing and pulling of a cart with four swivel wheels, defined by a roll box pallet (RBP) in a Japanese industrial standard. Methods: Six healthy young male participants were asked to push and pull an RBP at a distance of 5.2 m under six conditions corresponding to different interhandle distances (40 cm, 60 cm, and 80 cm) and weights (130 kg and 250 kg). The upper limb exertion was studied by shoulder abduction and flexion, and elbow flexion, as well as surface electromyogram (EMG) in shoulder extensor, and elbow flexor and extensor. Participants were required to provide subjective evaluations on operability after each trial. Results: Subjective operability indicated that a narrower interhandle distance had a better operability for pushing. Interhandle distance was also related to upper limb exertion especially for pushing. A narrow interhandle distance caused smaller shoulder adduction but larger elbow flexion. The normalized EMG data revealed that muscular activity became smaller with a narrow interhandle distance in shoulder extensor. During the pulling task, elbow flexion was smaller at a narrow interhandle distance, although subjective operability and normalized EMG were not significantly varied. Conclusion: A wider interhandle distance, such as 80 cm, was not suitable in the forwardbackward movement of the RBP. Therefore, this study concluded that an interhandle distance of 40 cm would be suitable for pushing and pulling an RBP to protect the workers' hands against the risk of injury by installing inner handles.

• 한국안전학회지
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• 제31권3호
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• pp.162-167
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• 2016

As the simple empirical and phenomenological model applied to the analysis of leakage and explosion of chemical substances does not regard numerous variables, such as positional density of installations and equipment, turbulence, atmospheric conditions, obstacles, and wind effects, there is a significant gap between actual accident consequence and computation. Therefore, the risk management of a chemical plant based on such a computation surely has low reliability. Since a process plant is required to have outcomes more similar to the actual outcomes to secure highly reliable safety, this study was designed to apply the CFD (computational fluid dynamics) simulation technique to analyze a virtual prediction under numerous variables of leakages and explosions very similarly to reality, in order to review the computation technique of the practical safety distance at a process plant.

• 한국건축시공학회지
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• 제20권3호
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• pp.253-260
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• 2020

지하형 탄약고에 대한 관심이 증가하면서, 관련된 설계 결과가 다수 도출되고 있다. 그러나 터널 민간 전문가들뿐만 아니라 탄약관련 군 실무자들도 안전거리 기준을 완벽하게 숙지하지 못하여 안전거리 기준을 모두 준수한 신뢰성 있는 설계 결과는 도출되고 있지 않고 있는 실정이다. 또한 안전거리를 과하게 적용하여 부지를 비효율적으로 활용하거나 시공불가판정을 받는 사례도 보고되고 있다. 본 연구에서는 지하형 탄약고에 대한 안전거리 기준을 정리하고 이를 준수하면서 효율적으로 설계할 수 있는 방안에 대해 연구하였다. 또한 여러 방법 중 안전거리를 획기적으로 저감시킬 수 있는 방법을 도출하여 향후 지하형 탄약고 설계 및 시공 시에 적용할 수 있도록 데이터를 마련하였다.

• 해양환경안전학회:학술대회논문집
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• 해양환경안전학회 2018년도 공동국제학술발표회
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• pp.43-43
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• 2018

• 한국산학기술학회논문지
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• 제7권4호
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• pp.721-726
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• 2006

본 논문은 가스 저장탱크 안전거리의 지적결정 시스템에 관한 것으로, 현장에서는 저장탱크의 파열로 인한 위해를 예방하기 위해 법에서 설정한 안전거리를 유지하고 있다. 하지만 이는 비전문가에게는 저장탱크의 크기, 형상, 그리고 위치를 고려한 적절한 안전거리를 결정하기란 결코 쉽지 않다. 따라서 본 논문에서는 비전문가라도 가스 3법 및 저장탱크의 크기, 형상, 그리고 위치를 지적결정에 의하여 선택하도록 하는 사용자 친화적 지적결정 시스템을 개발하였다. 이를 통하여 얻어진 자료의 활용으로 현장에서 안전관리에 만전을 기할 수 있도록 하였다. 또한 본 논문에서는 저장탱크의 파열로 인한 과압의 피해영향 거리를 Hopkinson의 삼승근법을 이용하여 계산하여 법에서 규정한 거리와 비교 평가할 수 있는 자료를 생성토록 하였으며, 또한 이를 PHAST 모델에 적용하면 그래픽으로 출력이 되어 보다 쉽게 안전범위를 파악할 수 있도록 하였다.

• 한국안전학회지
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• 제29권4호
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• pp.91-96
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• 2014

This research deals with the combustion experiment of pine trees, which are the most representative species in Korea. Experimental data are compared with theoretical ones using Fire Simulation Program(FDS). It is considered that horizontal/vertical temperature distribution and radiant heat influence on adjacent areas in fire scenes. The linear function for separation distance to temperature was drawn by applying Stefan-Boltzmann's law; $y=112.13133{\times}({\sigma}T^4)^{-0.52916}$ for calculating the separation distance. In combustion experiment, the radiant heat came to $1.4{\sim}1.5kW/m^2$ in case of the separation distance by one meter. The numerical values mean that human body show the critical level of pain after one minute without a protective equipment.

• 한국군사과학기술학회지
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• 제18권4호
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• pp.409-414
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• 2015

M125 booster is one of the reliable S&A device(safety and arming device) to determine the arming distance of fuze for gun ammunitions from 90 mm to 8 inch in diameter. And it is also well known that the arming distance of M125 booster is determined by the multiplication value of the gun tube property(traveled distance per turn of projectile) and the S&A device property(number of turns to arm), not by the projectile muzzle velocity. We have tried and succeeded in executing a proper analysis on M125 booster to figure out its characteristic constant of arming distance by considering only the gun tube properties and the S&A device properties. More detailed arming distance will be analyzed in the future by considering dynamic characteristics on all elements in the S&A device with vector analysis.

• 자동차안전학회지
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• 제12권3호
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• pp.43-51
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• 2020

Currently, the second level of the six stages of self-driving technology, as defined by SAE, is commercialized, and the third level is preparing for commercialization. The purpose of ACC is to be evaluated as a system useful for preventing and preventing accidents by minimizing driver fatigue through longitudinal speed control and relative distance control of the vehicle. In this regard, for the study of safety assessment methods in the practical environment of ACC. Distance measurement method using monocular camera and data acquisition equipment such as DGPS are utilized. Based on the evaluation scenario considering the domestic road environment proposed by the preceding study, the relative distance obtained from equipment such as DPGS and the relative distance using a monocular camera in the actual test is verified by comparing and analyzing the safety assessment. The comparison by scenario results showed a minimum error rate of 3.83% in Scenario 1 and a maximum of 14.61% in Scenario 6. The cause of the maximum error is that the lane recognition is not accurate in the camera image and irregular operation conditions such as rushing in or exiting the surrounding area from the walkway. It is expected that safety evaluation using a monocular camera will be possible for other ADAS systems in the future.

• 농업과학연구
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• 제44권2호
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• pp.188-195
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• 2017

Biotech crops can only be commercialized after they receive safety approvals, which require thorough risk assessments of their release to the environment. Environmental release experiments are indispensable for environmental risk assessments, and each country has been preparing its own regulations for the safety management of experiments on the environmental release of biotech crops in confined fields. In this study, we compared and analyzed the safety management regulations of the environmental release of biotech crops in Korea, USA, Japan, European Union, and China. Each country had safety management regulations for the environmental release of biotech crops, and these regulations were generally not much different from the Korean regulations. However, there was a difference amongst the USA, Japan, and China in regulations for isolation distances to prevent gene diffusion through pollen-flow during environmental release experiments of biotech crops. In order to establish the isolation distance regulation suitable for the Korean environment, relevant data were collected and presented. For setting the isolation distance for environment release of biotech crops, it is suggested to refer to the isolation distance information provided in the Guidance of Seed Management in Korea. The results of this study are expected to help establish the safety management of biotech crops in Korea.

• 해양환경안전학회:학술대회논문집
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• 해양환경안전학회 2017년도 공동학술발표회
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• pp.247-247
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• 2017