• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.2130-2131
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• 2011

Electric fire breaks out by various causes such as electric short, overload(over current), leakage current, poor contact, static electricity, insulation deterioration, partial disconnection and etc. In this paper, we studied analysis technique for scientific and systematic judgment for distinction of electricity fire existence and nonexistence, and described about electricity fire cause analysis process for collecting physical evidences. We handled external form analysis, Substance extension analysis, X-ray transmission analysis, cross-section analysis, thermal analysis, chemical structure analysis, surface structure analysis, component analysis, electrical properties analysis, and circuit analysis by analysis technique for electricity fire cause judgment. We expect that analysis technic elevation and correct cause of fire analysis of scene of a fire investigators and analysts through this paper which see help.

• 한국가스학회지
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• 제24권3호
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• pp.54-62
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• 2020

구미 휴브글로벌 AHF 누출사고를 보면서 화학 사고가 우리 사회에 미치는 영향이 얼마나 큰지 경험한 바 있다. 이후로 여러 분야에서 화학 사고에 관한 많은 연구가 수행되고 있다. 사용처에서는 공정 시스템에 대한 개선방안을 찾아 현장에 적용하고자 했고 안전분야에서는 피해 영향 분석을 통한 안전성 향상을 연구하여 비상대응에 적용하여 피해 영향을 줄이고자 하였다. 본 연구에서는 이충전 작업 시 일어나는 화학사고에 신속하게 대응할 수 있는 기계적 안전장치를 적용하여 AHF ISO Tank의 안전성을 높이고자 하였다. 연구의 수행으로는 우리나라에 연간 유통되는 AHF의 수입량의 규모와 운반의 수단으로 사용되는 ISO Tank의 운송 물량을 조사하고 AHF ISO Tank의 구조 및 Unloading 절차를 조사하였다. 많은 유형의 탱크로리를 조사하는 과정에서 AHF ISO Tank 구조와 작업 절차가 유사한 염소 탱크로리에 기계적 안전장치인 EFV(과류 방지 밸브)가 설치되어 있는 것을 확인하였다. EFV의 AHF ISO Tank에 적용성과 도입 시 안전기능인 긴급차단에 대한 성능을 휴브글로벌 사고와 2018년에 울산에서 발생한 염소 Tank lorry의 사고사례를 비교 조사하여 실제 사고에서 얻은 자료로 검정할 수 있었다. 사고사례와 적용성 등을 비교한 결과, AHF ISO Tank에 화학사고 피해를 감소시키고 사고를 조기에 수습할 할 수 있는 기계적 안전장치인 EFV를 도입할 것을 제안하며 휴브글로벌 사고와 같은 화학 사고에 도움이 되고자 한다.

• 한국전기전자재료학회논문지
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• 제36권2호
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• pp.158-163
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• 2023

Recently, the global demands for high voltage power semiconductors are increasing across various industrial fields. The use of electric cars with high safety and convenience is becoming practical, and IGBT modules of 3.3 kV and 1.2 kA or higher are used for electric locomotives. Delicate design and advanced process technology are required, and research on the optimization of high-voltage IGBT parts is urgently needed in the industry. In this study, we attempted to design a simulation process through TCAD (technology computer-aid design) software to optimize the process conditions of the fielding process among the core unit processes for an especial high yield voltage. As well, the prior circuit technology design and a ring pattern with a large number of ring formation structures outside the wafer similar to the chip structure of other companies were constructed for 3.3 kV NPT-IGBT through a unit process demonstration experiment. The ring pattern was designed with 21 rings and the width of the ring was 6.6 ㎛. By changing the spacing between patterns from 17.4 ㎛ to 35.4 ㎛, it was possible to optimize the spacing from 19.2 ㎛ to 18.4 ㎛.

• 방사성폐기물학회지
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• 제21권4호
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• pp.451-463
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• 2023

With South Korea increasingly focusing on nuclear energy, the management of spent nuclear fuel has attracted considerable attention in South Korea. This study established a novel procedure for selecting safety-relevant radionuclides for long-term safety assessments of a deep geological repository in South Korea. Statistical evaluations were performed to identify the design basis reference spent nuclear fuels and evaluate the source term for up to one million years. Safety-relevant radionuclides were determined based on the half-life criteria, the projected activities for the design basis reference spent nuclear fuel, and the annual limit of ingestion set by the Nuclear Safety and Security Commission Notification No. 2019-10 without considering their chemical and hydrogeological properties. The proposed process was used to select 56 radionuclides, comprising 27 fission and activation products and 29 actinide nuclides. This study explains first the determination of the design basis reference spent nuclear fuels, followed by a comprehensive discussion on the selection criteria and methodology for safety-relevant radionuclides.

• 한국산업보건학회지
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• 제33권1호
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• pp.3-5
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• 2023

Objective: This study introduces exposure concentrations of time-weighted average standard (TWA) evaluation and short-time exposure standard (STEL) evaluation for trichloroethylene in the cleaning process. Methods: Trichloroethylene measurement was conducted according to the KOSHA Guide (A-24-2019) method. It was carried out twice. Results: As a result of the first measurement, TWA concentration exceeded 4 times the exposure standard and STEL concentration exceeded 16 times, but the inaccuracy and breakthrough of the collection time could not be considered, so the second measurement was conducted. The second measurement result was lower than the first measurement result, but exceeded the exposure standards (TWA, STEL). Conclusions: We were able to confirm that the exposure level of workers in the cleaning process using trichloroethylene exceeded the exposure standard. And it is also considered necessary to grasp the approximate concentration using a detector tube in the preliminary survey.

• Korean Chemical Engineering Research
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• 제54권6호
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• pp.781-785
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• 2016

위험물인 염산을 취급하는 사업장에서 발생할 수 있는 사고를 알아내고 사고시 인근에 미치는 영향을 평가하여 어느 정도 위험이 있는지 알아보며 이에 대한 대비책을 적용하고자 하였다. 취급 화학물질 정보와 공정정보로부터 사고 시나리오를 선정하고 염산 누출시 사업장외로 영향을 미치는 사고 시나리오를 선정하여 환경부의 지침에 따라서 ALOHA를 활용하여서 평가하였다. 최악의 사고 시나리오를 비롯한 사고 시나리오를 평가하였으며 이들의 사고시 피해완화대책도 살펴보았다. 평가결과 염산생산시설은 현재의 안전조치가 충분하여서 추가의 개선대책이 필요하지 않은 것으로 판명되었다.

• 유통과학연구
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• 제15권10호
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• pp.29-39
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• 2017

Purpose - The purpose of this study is to promote sales of the renewable energy industry and to advance into the Southeast Asian market. Research design, data, and methodology - This study is to develop a highly efficient food waste treatment system for Southeast Asian renewable energy industry. The radiation treatment method was applied for this purpose. Results - To investigate effects of ionization on removal of non-degradable organic matter, the results from gamma irradiation and co-digestion process was compared to those from a co-digestion process. Based on the BMP test results, food wastes were oxidized by hydroxyl radicals, and the specific methane yield was 366 mL CH4/g VS. Methane composition was 82%. A WAS/food wastes co-digestion was developed for the treated of non-degradable organic matter in food wastes. The average efficiency of non-degradable organic matter were 92.2% using the food waste co-digestion. Conclusions - Performance of gamma irradiation and co-digestion process was superior to that of a co-digestion process (10-20%). This implies that food wastes can be high efficient co-digested by the gamma irradiation. It is believed that it will be possible to enter the Southeast Asian energy industry as a strategic technology in the overseas energy recovery industry.

• 한국가스학회지
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• 제17권1호
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• pp.56-66
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• 2013

가스제조 시설들은 불활성 가스공급을 통하여 제조업 시설의 안전한 운영 및 유지하는 역할을 하며, 폭발성, 가연성 및 독성가스를 공급하여 화학제품 제조에 필요한 기초 원료의 공급을 담당하는 역할을 한다. 또한 가스의 제조과정에서 고온, 고압, 초저온 및 촉매반응 등의 운전조건 하에서 시설이 운전되기 때문에 안전하고 신뢰성 있는 운영이 반드시 필요하다. 이러한 공장들은 공정관리가 복잡하며 제조물질의 누출로 인한 화재, 폭발 및 독성가스 누출로 인한 중대산업사고의 위험성이 있고, 불활성가스로 인한 질식재해, 고온 및 초저온으로 인한 화상 등 잠재적인 위험요소를 많이 가지고 있다. 본 연구는 신뢰성 있는 준 정량적 위험성평가 기법인 GRA(Generic Risk Analysis) 모델을 공기분리시설(ASU)에 적용하여 초기위험도(Initial Risk) 산정, 안전방벽(Safety Barriers) 적용, 잔여위험도(Residual Risk) 산정 및 중요안전요소(EIS, Elements Important for Safety)를 도출 하였으며, 위험성 평가 결과로 도출된 중요안전요소에 대한 효과적인 안전관리 및 시행절차의 구축을 제안하였다.

• 한국산업보건학회지
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• 제23권4호
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• pp.367-373
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• 2013

Objectives: Employee exposure record refers to a record containing information about environmental (workplace) monitoring or measuring of a toxic substance or harmful physical agent. The aims of this study were to examine problems related to exposure records and provide some amendments to the Korean Industrial Safety & Health Act for the effective management of chemical substances under the law. Methods: This study performed a literature search and review on legal provisions related to exposure records of a number of different countries, including Korea, the USA, Japan, EU, Germany, and the UK. They were compared and investigated and the amendment of articles was suggested. Results: The results of this study were provided as suggested amendments to the related act. There were a variety of ways of improvement, including a 30-year retention period and the introduction of new access methods, contents, transfer, and maintenance methods. All exposure data elements have to be standardized, including reference to a similar exposure group (SEG), sampling strategy, and circumstances of exposure (e.g., date, shift length, use of personal protective equipment, etc.). The SEGs are described by process, job, task, and environmental agent. Conclusions: This study is expected to provide for the amendment of the related act in order to ensure effective management of exposure records and is helpful for solving the cause and result of occupational disease by keeping exposure records according to the Industrial Safety & Health Act.

• 한국산업보건학회지
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• 제27권4호
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• pp.257-268
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• 2017

Objectives: This study was conducted to review the Toxic UseReduction Act of Massachusetts, USA, which has been evaluated as a successfulcase of a chemical reduction policy, and to search for ways to introduce it inKorea. Methods: We analyzed the implementation of the TURA by attending TUR Planning Course of the Toxic Use Reduction Institute in Massachusetts and researching the related literature. Results: As TURA took effect, the use of chemicals in Massachusetts was reduced, and cost savings were achieved in workplaces. The success factors for the legislation are considered to be support form the federal and state governments and the active participation of business and civic group. Domestic efforts to reduce toxic substances have already begun, so if the process of TURA is appropriately applied to domestic legislation of chemicals control, it would be expected to produce visible results. Therefore, we reviewed the 'Act on Chemicals Registration and Assessment', 'Act on Chemical Control' and 'Act on the Integrated Control of Pollutant-Discharging Facilities' and sought solution for applying TURA to each piece of legislation. For the first case, 'Toxic or Hazardous Substance List' and 'Establishment of Toxic Use Fee' is applicable. For the second case, 'Annual Toxic or Hazardous Substance Reports' is applicable. For the third case, 'Toxic Reduction Plans' and 'Toxics Use Reduction Institute and 'Toxic Use Reduction Planners' is applicable. Conclusions: The government should take notice appropriateness for the reduction of toxic chemicals and provide financial support. Businesses should invest in technologies that build trust with local communities, improve productivity, and reduce costs. Finally, civic group should cooperate with government and businesses.