• Journal of Advanced Marine Engineering and Technology
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• 제40권4호
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• pp.325-329
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• 2016

본 연구에서는 Indium-Tin-Oxide 인쇄 박막의 원격 검출이 가능한 해양오염 방제용 센서로서의 응용 가능성에 대해 연구하였다. 우선 양질의 박막제작을 위한 바인더 비율, Indium-Tin-Oxide 중 주석 농도, 열처리 온도 등의 Indium-Tin-Oxide 인쇄박막 제작 조건을 최적화시켰다. 이를 이용하여 전기저항형 액체 센서를 제작하였고, 센서 동작을 확인하기 위하여 대기 중과 해수 중에서 저항 변화를 확인하였다. 이때 저항 변화의 원인은 전해질 속에서 표면에서 일어나는 환원반응에 의한 것으로 해석하였다. 또한 제작된 센서를 Arduino를 사용하여 작동시키고 취득한 데이터의 원격 검출이 가능함을 확인하였다.

• 환경분석과 독성보건
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• 제21권4호
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• pp.209-219
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• 2018

In the areas of RoHS, WEEE, ELV and REACH, reinforcement of environmental regulations against harmful substances is a global trend not only in EC but also in all over the world. In the fields of Korea's major export products such as material parts, electrical and electronic products and automobile parts, we are responding to these regulations consistently. To develop reference material for analyzing lead and cadmium in paints, the candidate materials were produced through the screening process which separated shapes and sizes. To secure the traceability of the candidate materials produced, the characteristics and uncertainties are estimated by ICP-AES analysis using the primary reference material. The short-term and long-term stabilities also are evaluated in parallel. In order to calculate the final certification value of the candidate material, the verification were carried out by the performance evaluation through the comparison among the KOLAS (Korea Laboratory Accreditation Scheme) laboratories, and the CRM was produced in accordance with ISO Guide 35. The certified values and uncertainties of Pb and Cd of the final paint standard, determined according to the joint analysis among laboratories, are Pb [($191.4{\pm}3.1$) mg/kg, ($944.1{\pm}5.6$) mg/kg] and Cd [($45.0{\pm}2.6$) mg/kg, ($225.5{\pm}3.5$) mg/kg]. These standard materials were developed to enhance the reliability of measurement analysis, including the validity and traceability of measurement results. Also it is expected that the CRM will be used as QCM (quality control material) for the product design and the process monitoring, so that regulation and management of hazardous heavy metals can be systematically implemented.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1989년도 춘계학술대회 논문집
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• pp.35-36
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• 1989

A streaming current in liquid generated by flow electrification in a pipe is very hazardous and has to be reduced before the liquid is put into a storage tank, it was measured in pipe (${\Phi}$: 0.5mm, 0.8mm length: 1.5-11cm), it was increased as increasing pressure of Ar gas and appeared a peak value at 5cm of pipe length in 4m/sec of flow velocity.

• 한국화재소방학회:학술대회논문집
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• 한국화재소방학회 2007년도 춘계학술논문발표회 논문집
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• pp.175-181
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• 2007

• Environmental Engineering Research
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• 제20권4호
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• pp.342-346
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• 2015

Haloacetonitriles (HANs) are nitrogenous disinfection by-products (DBPs) that have been reported to have a higher toxicity than the other groups of DBPs. The adsorption process is mostly used to remove HANs in aqueous solutions. Functionalized composite materials tend to be effective adsorbents due to their hydrophobicity and specific adsorptive mechanism. In this study, the removal of dichloroacetonitrile (DCAN) from tap water by adsorption on thiol-functionalized mesoporous composites made from natural rubber (NR) and hexagonal mesoporous silica (HMS-SH) was investigated. Fourier-transform infrared spectroscopy (FTIR) results revealed that the thiol group of NR/HMS was covered with NR molecules. X-ray diffraction (XRD) analysis indicated an expansion of the hexagonal unit cell. Adsorption kinetic and isotherm models were used to determine the adsorption mechanisms and the experiments revealed that NR/HMS-SH had a higher DCAN adsorption capacity than powered activated carbon (PAC). NR/HMS-SH adsorption reached equilibrium after 12 hours and its adsorption kinetics fit well with a pseudo-second-order model. A linear model was found to fit well with the DCAN adsorption isotherm at a low concentration level.

• 한국안전학회지
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• 제31권1호
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• pp.111-117
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• 2016

Natural disasters can cause major accidents in chemical facilities where they can lead to the release of hazardous materials which in turn can result in fires, explosions or toxic dispersion. Technological disasters triggered by natural disasters are referred to as NaTech(Natural Disaster Triggered Technological Disaster). These trends increase the probability of catastrophic future disasters and the potential for mass human exposure to hazardous materials released during disasters. In the present study, we proposed some methods for effective disaster management by conducting case study of major NaTech. First, establishing information sharing system of chemical accident for stakeholders and improving disaster manuals and standards of central and local government and co-operation support system. Second, activating information service of emergency planning and community right to know. Third, improving the integrated chemical accident database including NaTech accidents.

• 대한안전경영과학회지
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• 제16권2호
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• pp.81-90
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• 2014

Flexible production system has been expanded to all sectors of economy with the change of labor market and diversification of employment. The unstable employment with irregular work has replaced stable employment with regular work. This study has investigate the impact pathway of the type of employment on health status especially ill-health symptoms experiences. Among the first Korean Working Conditions Survey data, the employee's response data was used to analyze the path way with multiple regression analysis. The result has shown the direct effect of the type of employment on ill-health symptoms experience. Indirect effect of the type of employment was found the pathway via the exposure to noise, high temperature, low temperature, dust, skin contact to chemicals, painful posture, heavy material handling, standing position, repetitive movement of hands. However the exposure to the other hazardous factors such as organic solvent, wholebody vibration, radiation, lifting people, infectious materials were not influenced by the type of employment.

• 한국산업보건학회지
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• 제32권4호
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• pp.371-380
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• 2022

Objectives: To ensure that employers handling petroleum compounds understand whether petroleum-based UVCB (unknown or variable composition, complex reaction products, or biological materials) substances contain hazardous substances and comply with the Occupational Safety and Health Act, petroleum-based UVCB substances were analyzed and the results from samples were compared with MSDS (Material Safety Data Sheet) contents. Methods: Twenty-one petroleum samples were analyzed using GC-MS (Gas Chromatography-Mass Spectrometry), targeting ten volatile organic compounds regulated by the Occupational Safety and Health Act. Results: The target chemicals were detected in 13 out of 21 samples. All 13 samples were in the naphtha (low boiling point naphthas (gasolines)) group. There were also naphtha group samples containing 2% benzene. Some naphtha samples used as solvents contained about 1% benzene. Conclusions: This study shows that naphtha group petroleum substances contain hazardous chemicals in many cases. In particular, if benzene, n-hexane, and toluene with low occupational exposure limits are contained above the limit concentration. Such information should be delivered in the article on MSDS legal regulations.

• Advances in nano research
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• 제12권4호
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• pp.375-386
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• 2022

Synthesis of acrylate-based dispersion resins involves many parameters including temperature, ingredients concentrations, and rate of adding ingredients. Proper controlling of these parameters results in a uniform nano-size chain of polymer on one side and elimination of hazardous residual monomer on the other side. In this study, we aim to screen the process parameters via Internet of Things (IoT) to ensure that, first, the nano-size polymeric chains are in an acceptable range to acquire high adhesion property and second, the remaining hazardous substance concentration is under the minimum value for safety of public and personnel health. In this regard, a set of experiments is conducted to observe the influences of the process parameters on the size and dispersity of polymer chain and residual monomer concentration. The obtained dataset is further used to train an Adaptive Neural network Fuzzy Inference System (ANFIS) to achieve a model that predicts these two output parameters based on the input parameters. Finally, the ANFIS will return values to the automation system for further decisions on parameter adjustment or halting the process to preserve the health of the personnel and final product consumers as well.

• 한국화재소방학회논문지
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• 제34권4호
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• pp.96-100
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• 2020

산업단지내 위험물 저장탱크 기초의 결함으로 인한 위험물질의 유출사고는 인근 지역의 대형 인명사고 및 대형화재를 일으킬 수 있으므로 기초의 설계 및 시공단계에서 세심한 주의를 기울여야 한다. 본 연구에서는 기존 위험물탱크 단지가 건설된 대표지반을 선정하여 3차원 모델링에 의한 유한요소 수치해석을 수행하였으며, 위험물 저장탱크 기초의 안정성 평가를 위하여, 대표적인 탱크 기초 유형을 4종류로 분류하고 각 유형에 대한 해석을 수행하였다. 결과적으로, 탱크기초의 응력 및 침하량 크기와 분포 특성은 링월기초의 경우 옆판 직하부분이 탱크 중심부에 비해 40배 이상의 응력이 집중되는 경향을 보였으며, 침하영향범위는 수평방향으로 탱크 반경만큼, 수직방향으로 탱크 직경만큼으로 나타났다. 본 분석결과를 활용하여 각 기초 유형별로 위험물 저장탱크의 설계 및 품질관리 가이드라인을 제시하였다.