• Title/Summary/Keyword: Protection of Safety Accidents

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A Study on an Optimal Design of Electric Snow Melting Mat for Vulnerable Walk Zone (제설기반 취약지역 보행자의 전기안전발판(융설용) 최적설계에 관한 연구)

  • Kwon, Jin Wook;Jang, Chul;Hwang, Myung Whan
    • Journal of the Korean Society of Safety
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    • v.31 no.6
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    • pp.12-18
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    • 2016
  • This paper describes an optimal design of electric snow melting mat on vulnerable walk zone. In order to design an optimal electric power of snow melting mat and protect pedestrians with a nonslip mat, with considering protection of environmental pollution from abusing of the de-icing salts added calcium chloride. We analyzed nine snow melting mats through verification experiment in the condition of $-5^{\circ}C$, depending on three different kinds of heating material, electric heating cable, carbon heating film and carbon textile film. As a consequence, the $150W/m^2$ carbon textile film mat for snow melting was identified as an optimal power input and functional performance for pedestrians' safety on vulnerable walk zone. It is expected that the $150W/m^2$ carbon textile film mat would be useful to reduce slip down accidents by human error.

Design of Safety Education Courseware for protection Elementary School Students from Safety accidents (초등학생들의 안전사고 예방을 위한 안전교육 코스웨어의 설계)

  • Choi, Nak-Whan;Moon, Wae-Shik
    • 한국정보교육학회:학술대회논문집
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    • 2004.01a
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    • pp.260-267
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    • 2004
  • 언론보도에 따르면 우리나라 어린이들의 사망률이 인구 10만명당 25.6명으로 OECD회원국 가운데 가장 높은 것으로 나타나고 있다. 모든 위험상황으로부터 최우선적으로 보호되어야 할 대상인 어린이들이 우리 사회에서는 상당한 위험에 노출되어 있는 것이 현실이다. 지난 30년간의 급속한 산업화로 인해 물질의 풍요는 누렸지만 그 이면에 나타난 각종 안전사고는 점차 증가 추세이며 더욱 늘어날 것으로 예상되고 있다. 어린이의 귀중한 생명과 재산을 보호하기 위해서는 무엇보다도 어릴적부터 철저한 안전교육을 통한 안전 습관화와 함께 범 국가적인 차원의 안전대책이 마련되어야 할 것이다. 이에 우리나라도 올해를 어린이 안전 원년의 해로 정하여 각종 안전대책을 마련하고 있으며 학교안전 교육의 중요성이 부각되면서 안전교육을 위한 프로그램의 개발 보급이 요구되고 있다. 이전의 안전교육용 프로그램이 한국산업안전공단, 교통안전공단 둥 주로 외부기관에 의해 제작되어 초등학교 현장에 직접 투입하기에는 적절치 않아 초등학생들의 발달단계와 교육과정 분석을 통해 초등학교 학생들의 수준에 알맞은 내용으로 재구성하여 본 프로그램을 설계하게 되었다.

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Study on the Safety Standard Establishment of Halogen Clean Extinguishing Agents (할로겐화합물청정소화약제 안전기준 설정에 관한 연구)

  • Cho, Jung-Rae;Lee, Jong-Ho
    • Fire Science and Engineering
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    • v.32 no.5
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    • pp.22-33
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    • 2018
  • The amount of halogen clean fire extinguishing agents has been increased by the excellent features of extinguishing, adaptability and no residue. On the other hand in situations without a hazard assessment and safety standard of agents, chemical accidents by the agents occurs frequently. This study was performed to propose the halogen clean agents' regulatory exposure limit and safety standard including the quantitative ventilation system with gas leak monitoring, hazard recognition and optimal personal protection selection through a literature review and experimental research.

A Study on the Icing Certification of Rotorcraft (회전익 항공기의 결빙 인증에 대한 연구)

  • Lee, Hae-Sun;Park, Jong-Hyuk
    • Aerospace Engineering and Technology
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    • v.7 no.2
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    • pp.196-204
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    • 2008
  • Modem rotorcraft is required to have the capability to operate in all-weather conditions. Also icing condition is important issue to aircraft safety and certification. And rotorcraft icing research has come a long way during the past few decades. The aircraft icing is the most difficult to handle. So, icing-related accidents, incidents and operating problems still occur regularly in service, despite improvements in design and test techniques. By reviewing icing certification requirement of FAR(Federal Aviation Regulations) and KAS(Korean Airworthiness Standard), this paper describes methods how to demonstrate safety in the flight and consideration of icing when rotorcraft is required TC(Type Certification).

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Role of Police for Enhancement of Elderly Safety (노인안전 강화를 위한 경찰의 역할)

  • Cha, Min-Kyu;Kwack, Dae-Gyung
    • Korean Security Journal
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    • no.41
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    • pp.387-408
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    • 2014
  • South Korea already became an aging society, and is now in the process of becoming an aged society. With increasing elderly population, elderly safety issues such as traffic accidents and elderly suicides are becoming important problems. Elderly victimization are increasing, and elderly safety accident is also becoming an imporotant social problem. The police is doing various activities for elderly safety. The police is conducting programs for the elderly, such as a prevention program for fraud against elderly, and safety checks and traffic safety education for preventing elderly traffic accidents. Also, there's a program of providing regular visits for a lone elderly, expansion of CCTV network and fingerprint registration to prevent elderlies with Alzheimer's disease going missing. However, these programs are not done on a national scale, but rather limited to local police stations. The purpose of this study is to seek police roles for enhancing elderly safety, due to lack of police activity in this area. Recommendation for police roles in enhancing elderly safety is to first conduct routine crackdowns on fraud against elderly and also conduct education programs for preventing fraud. Also, crimes such as elderly abuse is lead by elderly protection agencies, but considering elderly abuse is a crime, the police should take a leading role. Also, to prevent elderly suicide, meticulous management of elderlies with high suicide risk is necessary, and elderly protection areas should be designated to prevent traffic accidents. Also, elderlies should be induced to turn in their driver's license. To conduct these matters of elderly safety, an organization exclusively charged with elderly safety is necessary. Elderly safety is a broad concept, and since police alone cannot handle the task of ensuring elderly safety, the police should take on a leading role in cooperative efforts with various institutions of the government, non-profit organizations and the community to establish a social saftey net for elderly safety.

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Risk Analysis of Ammonia Leak in the Refrigeration Manufacturing Facilities (냉동제조 시설의 암모니아 누출사고 위험 분석)

  • Kang, Su-Jin;Lee, Ik-Mo;Moon, Jin-Young;Chon, Young-Woo
    • Journal of the Korean Institute of Gas
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    • v.21 no.1
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    • pp.43-51
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    • 2017
  • Recently, ammonia leak occurred frequently in the domestic refrigeration manufacturing facilities. Ammonia caused great damage to the environment and human health in the event of an accident as combustible gases and toxic gases. After considering the types of ammonia accidents of domestic refrigeration manufacturing facilities and selected accident scenarios and to analyze the risk analysis through Impact range estimates and frequency analysis and there was a need to establish measures to minimize accident damage. In this study, depending on the method of analysis quantitative risk assessment we analyzed the risk of the receiver tank of ammonia system. Scenario analysis conditions were set according to the 'Technical guidelines for the selection of accident scenario' under the chemicals control act and 'Guidelines for chemical process quantitative risk analysis' of center for chemical process safety. The risk estimates were utilized for consequence analysis and frequency analysis by SAFETI program of DNV, event tree analysis methodology and part count methodology. The individual risk of ammonia system was derived as 7.71E-04 / yr, social risk were derived as 1.17E-03 / yr. The derived risk was confirmed to apply as low as reasonably practicable of the national fire protection association and through risk calculation, it can be used as a way to minimize accidents ammonia leakage accident damage.

Development of Vehicle Evaluation System for Pedestrian Protection (보행자 보호를 위한 차량평가시스템 개발)

  • Yong, Boo-Joong;Cho, Hyun-Deog;Lee, Jae-Wan
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.5 no.4
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    • pp.53-58
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    • 2006
  • IHRA Pedestrian Working Group has investigated and analyzed the current status of pedestrian-vehicle accidents in IHRA member countries. According to the results, European countries and Japan are working on new regulations to improve passive pedestrian protection on passenger cars significantly. Although IHRA proposed pedestrian test procedures, which may provide a basis of technical regulations in the future, further research and development are necessary to refine the procedures. In order to prepare and satisfy the pedestrian protection requirements, domestic passenger vehicles also should be tested. Among various safety-related studies based on accident data analysis, dealing with pedestrian head injury would be considered one of the keen interests. In this study, the pedestrian headform impact test system is developed. The developed system will be useful to carry out validation study of the test procedures through actual tests using sample vehicles, and to explore the car feasibility level prior to the use of the test methods in legislation.

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A Numerical Study to Analyze Safety of Pressure Leakage Monitoring System of Gas Extinguishing Agent (가스소화약제 압력누기감시장치의 안전성 분석을 위한 수치적 연구)

  • Go, A-Ra;Lim, Dong-Oh;Son, Bong-Sei
    • Fire Science and Engineering
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    • v.30 no.4
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    • pp.103-110
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    • 2016
  • While the demand for the gas system fire extinguishers increases every year, there are insufficient safety measures for assessing the extinguishing performance, such as system safety and reliability in the preparation of increasing demand, which has emerged as a social problem. One of the most critical causes of accidents occurring with the gas extinguishing system is pressure leakage from the extinguishing agent storage container. This is considered to be one of the critical factors on which the success of fire suppression depends. In this study, its safety measure was studied, Because it was deemed urgently necessary. The newly developed pressure leakage monitoring system is a system monitoring storage condition, pressure, leakage and discharge of the storage container related to agent concentration, which is one of the critical factors for fire suppression. This was developed to be applicable to the $CO_2$ and HFC-23 systems. Therefore, for structural safety analysis, the safety performance was verified by the fluid structure coupling analysis of the safety problems that may occur when the pressure leakage monitoring system is applied to the gas fire extinguisher. For analysis programs, the FloEFD program from Mentor Graphics was used for computational fluid dynamics analysis and ABAQUS from Dassault Systems was used for structural analysis. From the result of numerical analysis, the structure of $CO_2$ did not develop plastic deformation and its safety was verified. However, plastic deformation and deviation issue occurred with the HFC-23 monitoring system and therefore verified the structural safety of pressure leakage monitoring system by data obtained from redesigning and adjusting the condition of numerical interpretation three times.

Fatigue Safety Evaluation of the Half-Depth Precast Deck with RC Rib Panel (리브 형상을 갖는 반단면 프리캐스트 바닥판의 피로 안전성 평가)

  • Hwang, Hoon Hee
    • Journal of the Korean Society of Safety
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    • v.34 no.5
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    • pp.103-110
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    • 2019
  • In order to reduce the accidents occurring at construction sites, it is necessary to approach with harmonious measures considering various aspects such as systems, training, facilities, and protection equipments. Suggestion of safe construction method can be a good alternative. In the previous study, the half-depth precast deck with RC rib panel was proposed as an alternative method for safe bridge deck construction, and the performance required by the design code was verified through a four-point bending test. But the actual bridge deck is subjected to the repetitive action of the wheel load rather than the bending condition due to the four-point load. In this study, fatigue test was performed by repeating the wheel load $2{\times}10^6$ cycles to verify the safety of the half-depth precast deck with RC rib panel under actual conditions. As a result, fatigue effect due to repetition of wheel load was not significant in terms of serviceability such as crack width and deflection. In the residual strength test conducted after the fatigue test, the half-depth precast deck with RC rib panel failed by punching shear which is typical failure mode of bridge decks and the residual strength was similar to the punching strength of the RC and PSC bridge decks in spite of the fatigue effects.

The Effectiveness Analysis of the Resistive Leakage Current Monitoring by Analyzing the Phase of the Body Current (인체 통전전류 위상 분석을 통한 저항성 누설전류 감시의 유효성 분석)

  • Kim, Jae-Hyun;Lim, Young-Bea;Lee, Sang-Ick;Kim, Dong-Woo
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.27 no.9
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    • pp.90-99
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    • 2013
  • To analyze the effectiveness of the resistive leakage current monitoring as a technology preventing electrical accidents, in this paper, we have estimated the phase of the body impedance by using the body impedance model and the body impedance data from IEC. We also have analyzed the phase of the electric body current in the case of 60Hz/220V. From these results, we concluded that deliberate researches about the phase of the electrical body current and related regulations must be carried out before the resistive leakage current monitoring unit is used to protect electric shock. And we concluded that the resistive leakage current monitoring unit can be utilized to prevent electrical fires caused by electric leakage current without unwanted circuit break due to capacitive leakage current flowing from line filter capacitors to the earth.