• Title/Summary/Keyword: Serious industrial accidents

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Effects of Current Modulation Conditions on the Chromaticity of Phosphor Converted (PC) White LEDs

  • Kim, Seungtaek;Kim, Jongseok;Kim, Hyungtae;Kim, Yong-Kweon
    • Journal of the Optical Society of Korea
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    • v.16 no.4
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    • pp.449-456
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    • 2012
  • For two well-known modulation methods, stepwise current modulation (SCM) and pulse width modulation (PWM), the effects of driving current modulation conditions on chromaticity were experimentally investigated in a white LED lighting system. For the experimental implementation of both SCM and PWM, a white LED lighting was fabricated using phosphor converted (PC) white light emitting diodes (LEDs) and a driving circuit module was developed. By using them, the variations of illuminance, color coordinates, and spectrum were evaluated under various forward current conditions. Through the analysis in color coordinates, yellow shift in SCM and blue shift in PWM were observed on chromaticity diagrams with increasing average driving current. In addition, in order to analyze color deviation quantitatively, color distance before and after current increase, and the correlated color temperature (CCT) were calculated. As a result, for the white LED lighting in both modulation conditions, the maximum difference in the calculated CCT was obtained close to 1000 K. It means that careful consideration is required to be taken in the design of illumination systems to avoid serious problems such industrial accidents.

Effects of the Safety and Health Management System on Safety and Health Management Level and Accident Indicators in Construction Industry (건설업의 안전보건경영시스템 인증이 안전보건관리수준과 사고지표에 미치는 영향)

  • Kim, Panki;Lee, Sudong;Jung, Kihyo
    • Journal of the Korea Safety Management & Science
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    • v.24 no.3
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    • pp.15-21
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    • 2022
  • This study examined the certification effects of safety and health management system (SHMS) on the establishment level of SHMS and accident statistics in construction industry. This study obtained the establishment level of SHMS for 106 construction companies surveyed from our previous study. In addition, three major accident statistics (mortality rate, accidental mortality rate, and injury rate) for the companies were collected from the database in Korean Occupational Safety and Health Agency. The statistical analysis results revealed that the establishment level for SHMS certified companies was significantly higher than those for uncertified or certification preparing companies. Furthermore, SHMS certified companies showed significantly smaller accident statistics compared to uncertified or certification preparing companies. The results of this study support the positive effects of SHMS on reducing major industrial accidents in construction companies.

A Case Study on the Human Error Analysis for the Prevention of Converter Furnace Accidents (전로사고 예방을 위한 인적오류 분석)

  • Shin, Woonchul;Kwon, Jun Hyuk;Park, Jae Hee
    • Journal of the Korea Safety Management & Science
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    • v.16 no.3
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    • pp.195-200
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    • 2014
  • Occupational fatal injury rate per 10,000 population of Korea is still higher among the OECD member countries. To prevent fatal injuries, the causes of accidents including human error should be analyzed and then appropriate countermeasures should be established. There was an severe converter furnace accident resulting in five people death by chocking in 2013. Although the accident type of the furnace accident was suffocation, many safety problems were included before reaching the death of suffocation. If the safety problems are reviewed throughly, the alternative measures based on the review would be very useful in preventing similar accidents. In this study, we investigated the converter furnace accident by using human error analysis and accident scenario analysis. As a result, it was found that the accident was caused by some human errors, inappropriate task sequence and lack of control in coordinating work by several subordinating companies. From the review of this case, the followings are suggested: First, systematic human error analysis should be included in the investigation of fatal injury accidents. Second, multi man-machine accident scenario analyis is useful in most of coordinating work. Third, the more provision of information on system state will lessen human errors. Fourth, the coordinating control in safety should be performed in the work conducting by several different companies.

A Consequence Analysis of the Mitigation Impact on Emergency Shut-off Valves for Accidents of Underground Pipelines (사고영향평가를 이용한 지하 매설 배관 사고 시 긴급차단밸브에 의한 피해 범위 감소에 관한 연구)

  • Park, Sang Bae;Lee, Chang Jun
    • Journal of the Korean Institute of Gas
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    • v.23 no.2
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    • pp.28-34
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    • 2019
  • A large number of underground pipelines in the Ulsan National Industrial Complex has been constructed to improve the productivity of chemical products and tackle transportation problems. Now, the total of 1,293km of underground pipelines around 62 companies has been installed and operated. Many of underground pipelines have been installed outside of factories. For a past three years, five gas leakage accidents have occurred and the emergency response took up to 8 hours or more. Due to these delay in accidents, second serious accidents might occur and lead to occur damages to adjacent residents. In this study, it is assumed that emergency valve systems are installed under a ground and the efficacy of these is verified. Consequence analysis program was employed to evaluate the mitigation impact of emergency valve systems. The results show that these valve systems are economical and their performances for a mitigation are excellent. The results indicate that the installation of emergency valve systems for underground pipelines should be urgently legislated and performed.

The Relationship between Workers' Safety Behaviors and Safety Climate in Chemical Industry (화학산업 작업자의 안전행동과 안전분위기의 상관관계)

  • Baek, Jong-bae;Uhm, Minyong;Kim, Ji-sun
    • Journal of the Korean Society of Safety
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    • v.30 no.5
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    • pp.100-107
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    • 2015
  • Korea government has established and enforced countermeasures about the various policy of industrial accident prevention. Recent chemical accidents included hazardous materials. Exposure to these chemicals can cause serious environmental poisoning and various health problems. The key factor causing these major accidents may be associated with the mistake in workers' safety behaviors. Some researchers noted workers' safety behaviors may be related to workers' safety climate. In this research, a survey was conducted to explore workers' safety behaviors and safety climate in a large petrochemical company in Korea. The company processes major petrochemical materials and any spills can be hazardous and cause chemical disasters. In this study, we explored one petrochemical company to investigate three hypotheses. 593 workers were surveyed for this study. We checked association between workers' safety behavior and safety climate. The survey result shows the people who have safety climate do safe behavior.

New Safety Issues in the Machine Tool Industry due to the 4th Industry (4차산업으로 인한 공작기계산업의 새로운 안전문제)

  • Park, Young Suk
    • Journal of the Korean Society of Safety
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    • v.37 no.4
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    • pp.1-10
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    • 2022
  • The purposes of this study were to suggest 1) a future direction for Korea's machine tool industry and 2) how to secure the safety and reliability of emerging intelligent or automated machine tooling. The study concludes that, overseas, the machine tool industry is growing again while promoting innovation by converging with ICT. Accordingly, Korea also promotes ICT innovation to advance the machine tool industry, which is at the core of the national economy. As a result, unlike in the past, the frequency of serious injuries like entrapment accidents has recently decreased, while the proportion of collision accidents has increased. In addition, a new type of accident has become possible. Since ICT is network-based, the distinction between work and rest can become ambiguous; there is a risk of hacking, working hours and places are flexible and there are risk factors for diseases like chronic fatigue due to overload of specific personnel. As robots and automation are introduced, there is also a high probability of problems caused by physical and psychological burdens on system operators and resulting fatigue.

A Study on The Countermeasure by The Types through Case Analysis of Industrial Secret Leakage Accident (산업기밀 유출사고 사례분석을 통한 유형별 대응방안 연구)

  • Chang, Hangbae
    • Convergence Security Journal
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    • v.15 no.7
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    • pp.39-45
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    • 2015
  • Industrial secrets that companies own recently protected by various act related industrial security such as Trade Secret Act, Act on Prevention of Divulgence and Protection of Industrial Technology, etc. However, despite such protection infringement and leakage accidents of industrial secrets is increasing every year. According to a survey conducted by KAITS(Korean Association for Industrial Technology Security) annual average of estimated damage by industrial secrets leakage is estimated to be "50 trillion won." This is equivalent to the amount of annual revenue of small businesses more than 4,700 units. Following this, industrial secrets leakage causes serious damages to competitiveness of nation and companies and economic. However investment and effort to the industrial secrets leakage crime is lack of level compared to the scale of damage. Actually, most companies except some major companies are lack of response action about industrial secrets leakage because of shortage of separate organization, workforce, budget for industrial secrets leakage security. This paper aims to understand the overall flow of the industrial secrets leakage crime through various taxonomy such as cause of occurrence and leakage pathway and grasp the condition of damage from industrial secrets leakage through analyzation of internal and external industrial secrets leakage crime. This is expected to be the basis for related research.

A Consideration of Perception on Enforcement of Serious Accident Punishment Act(SAPA) among the Workers in the Nuclear Medicine Department (중대재해처벌법 시행에 따른 핵의학 종사자의 인식 고찰)

  • Lee, Joo-Young
    • Journal of the Korean Society of Radiology
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    • v.16 no.4
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    • pp.477-490
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    • 2022
  • Serious Accident Punishment Act(SAPA) went into effect as of Jan. 27, 2022. The subject of study was the worker of the nuclear medicine department and the investigation was aimed at identifying the present situation of their understanding on the issue in the here and now, which can be utilized as basic research for further study. The survey was conducted on 51 people of the worker in the nuclear medicine department. The general factors were classified by their gender, the scale of the hospitals, the period of career, and the detailed occupational categories. The conclusion was drawn, including 1 missing data in gender and 2 in the type of occupation. The targeted hospitals were tertiary hospital, university hospital, and general hospital which have nuclear medicine department in. The period of subjects' career was categorized by less than 3 years, 3 to 5 years, 5 to 10 years, and more than 10 years. The specific occupation was classified by in-vivo radiological technologist, radiation safety manager and others. The amount of pressure that the job entails was highest in the category of general hospital, the period of 3 to 5 years of job experience, and radiation safety manager each. The system of the code was well constructed in the category of general hospital, the period of less than 3-year career, and radiation safety manager, as they responded. The blood transmissible disease had the largest number of outbreak of accidents related to the serious industrial accident. In addition, the radiopharmaceutical dosing error had the highest number of outbreak of accidents related to the serious civil accident. Therefore, we need to improve SAPA, facility inspection, security of budget, security of professional manpower. It will help the stable use of radiation and ensure patient safety.

The Analysis about Generating Harmonic by Load Variations during Electric Railway Train Operation (전기철도 운행 중 차량 부하 변화에 따른 고조파 발생에 관한 분석)

  • Kang, Chul;Lim, Jae-Chan;Huh, Jae-Sun;Kim, Jae-Chul;Lee, Su-Gil;Han, Seoung-Ho;Lee, Eun-Kyu
    • Proceedings of the KIEE Conference
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    • 2009.07a
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    • pp.12_13
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    • 2009
  • Recently, TTX(Tilting Train eXpress) has operated test. Electric railways, including the TTX, have electric problems(harmonic etc) that could bring about serious accidents.. Thus, TTX's electrical problems also need leading studies because the new Korean TTX will operate earnestly in 2012. In this paper, electrical signals in TTX operation were detected to analyze electrical harmonic. The electrical harmonics considered operation modes triparted(coasting, acceleration, braking) were analysed and evaluated.

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Reduction Plan for nip accidents by a Roller Machine (산업용 로울러기의 협착재해 감소방안)

  • 박재범;강동규;김두현
    • Journal of the Korean Society of Safety
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    • v.18 no.2
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    • pp.22-27
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    • 2003
  • The roller machines installed in the industrial field are operated under hazardous conditions due to no safety devices available, human error during operation, defective safety devices, and inadequate regulation even in case that safety devices are provided. Up to now, most roller machines installed in domestic field are provides with band breaking system as a safety device. In this study, the emergency stop distance is measured within the limit of domestic regulation but violates a foreign regulation(EN1417). Consequently, it is concluded that the roller machines with a band breaking system have high possibility of death or serious injury of the operator and the system should be improved with the introduction of additional safety devices. This thesis suggests the safety measures suitable for the roller machines with different drive systems based on the experiment results. The use of the newly developed safety system has been tested on many cases.