• 한국환경보건학회지
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• 제36권2호
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• pp.163-169
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• 2010

All forms of asbestos are proven human carcinogens. All forms of asbestos cause malignant mesothelioma, lung, laryngeal, and ovarian cancers, and may cause gastrointestinal and other cancers. No exposure to asbestos is without risk, and there is no safe threshold of exposure to asbestos. Asbestos cancer victims die painful lingering deaths. These deaths are almost entirely preventable. When evidence of the carcinogenicity of asbestos became incontrovertible, concerned parties, including the Collegium Ramazzini, called for a universal ban on the mining, manufacture and use of asbestos in all countries around the world. Asbestos is now banned in 52 countries, and safer products have replaced many materials that once were made with asbestos. Nonetheless, a large number of countries still use, import, and export asbestos and asbestos-containing products. And still today in many countries that have banned other forms of asbestos, the so-called "controlled use" of chrysotile asbestos continues to be permitted, an exemption that has no basis in medical science but rather reflects the political and economic influence of the asbestos mining and manufacturing industry. To protect the health of all people in the world, industrial workers, construction workers, women and children, now and in future generations - the Collegium Ramazzini calls again today on all countries of the world, as we have repeatedly in the past, to join in the international endeavor to ban all forms of asbestos. An international ban on asbestos is urgently needed.

• Child Health Nursing Research
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• 제25권2호
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• pp.175-183
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• 2019

Purpose: This study was conducted to analyze physical symptom-related and life-style factors affecting suicidal ideation of senior grade students in elementary school. Methods: Physical symptom-related and life-style factors were used to investigate suicidal ideation among 663 elementary school students. From February 11 to 15, 2018, data were collected using a structured questionnaire and analyzed using the $x^2$ test, Pearson correlation analysis, and logistic regression analysis in SPSS for Windows version 22.0. Results: The factors affecting suicidal ideation were gender, family structure, economic status, academic performance, exposure to school violence during the past year, physical symptoms, drinking experience, smoking experience, sleeping time, and ramen noodle consumption. The regression analysis showed that exposure to school violence during the past year (odds ratio [OR]: 102.99, 95% confidence interval [CI]: 51.19~207.19, p=.001), number of physical symptoms (OR: 1.25, 95% CI: 1.12~1.41, p=.001), drinking experience (OR: 3.17, 95% CI: 1.66~6.06, p=.001), and game and internet usage time (OR: 2.08, 95% CI: 1.08~4.01, p=.029) affected suicidal ideation. Conclusion: This study revealed that physical symptoms and life-style significantly influenced suicidal ideation. Therefore, interventions to reduce suicidal ideation in children must focus on improving children's physical symptoms and life-style.

• Corrosion Science and Technology
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• 제21권4호
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• pp.258-272
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• 2022

Steel structures exposed to the outdoors experienced several types of corrosion, which may reduce their thickness. Since atmospheric corrosion can induce economic losses, it is important to consider the atmospheric corrosion behavior of a variety of metals and alloys. This work performed outdoor exposure tests for 10 years at 14 areas in Korea and calculated the atmospheric corrosion rate of weathering steel. This paper discussed the atmospheric corrosion behavior of weathering steel based on various corrosion factors. The average corrosion rates in coastal, industrial, urban, and rural areas were found to range from (2.83 to 4.23) ㎛/y, (2.99 to 4.23) ㎛/y, (1.72 to 3.14) ㎛/y, and (1.57 to 2.85) ㎛/y respectively. It should be noted that the maximum corrosion rate was about 6.0 times greater than the average corrosion rate. Regardless of the exposure sites, the color differences were increased, but the glossiness was reduced and there was no relationship between the corrosion rate and environmental factors and the glossiness.

• 방사선산업학회지
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• 제17권1호
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• pp.111-118
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• 2023

The International Commission on Radiological Protection (ICRP) 103 recommends a cost-benefit analysis method as an auxiliary tool for scientific and rational decision-making for the principle of optimization of radiological protection. In order to conduct a cost-benefit analysis, the safety improvement of nuclear power by regulation must be measured and converted into monetary terms. The improvement of nuclear safety can be measured by reducing the radiation exposure dose of the people, and it is necessary to determine the coefficient to convert the radiation exposure dose into money. The monetary coefficient is calculated as the product of the statistical life value (VSL) and the nominal risk coefficient. In order to derive the monetary coefficient, the willingness to pay (WTP) can be estimated using the contingent valuation method (CVM), which quantifies the value of non-market goods by converting them into monetary units. WTP can be estimated based on the random utility model, which is the basic model for bivariate selection type conditional value measurement data. Statistical life value can be calculated using the estimated WTP and reduction in early mortality, and a monetary coefficient can be derived.

• 대한예방의학회:학술대회논문집
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• 대한예방의학회 1994년도 교수 연수회(환경)
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• pp.681-691
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• 1994

The American Conference of Governmental Industrial Hygienists (ACGIH) has proposed a threshold limit value (TLV) for benzene of 0.1 ppm. Individuals representing the American Petroleum Institute (API)and the Chemical Manufacturers Association (CMA) have argued that 1) the risk assessment by Rinsky .et al. which ACGIH partially relied upon for its proposed TLV overestimates the risk; however, at the exposures levels of interest - (e.g., 0.1 to 1.0 ppm) for establishing a benzene TLV, the Rinsky et al. assessment provides lower estimates of leukemia risk than most others; 2) ACGIH should not use the Dow study for direct observational evidence of leukemia risk associated with low-level benzene exposure because of confounding exposure; however, it is unlikely that confounding exposures played a role in the excess of leukemia demonstrated in the study, and the Dow cohort was exposed to an average benzene concentration of about 5.5 ppm benzene for 7.11 years (31:1.5 ppm-years), while some of the individuals in the study who died from leukemia were exposed to an average of only 1.0 ppm without the opportunity for highpeak exposures; 3) the Occupational Safety and Health Administration (OSHA) established an 8-hour time-weighted average (TWA) of 1.0 ppm in 1987, and there is no new evidence that would justify reducing the TWA below that level; however, the OSHA TWA of 1.0 ppm was based on economic feasibility and the level of excess risk remaining at 1.0 ppm, i.e., 10 excess leukemia deaths per 1000 workers over an occupational lifetime (45 years) according to OSHA's preferred estimate leaves behind I risk considered significant by OSHA. In addition, chromosomal studies among workers and in animals exposed to benzene indicate that low-level exposure, i.e., 1.0 ppm, is associated with elevated Cytogenetic damage. On the basis of adverse health effects data alone, in this author's opinion, it would be poor science and poor public health policy to establish a benzene TLV greater than 0.1 ppm.

• Journal of Radiation Protection and Research
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• 제27권2호
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• pp.77-80
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• 2002

원자력시설의 정상 운영시 일반인에 대한 단위 집단선량의 금전가 (피폭선량 금전가) 모델을 기본으로, 사고후 만성피폭에 대해 보다 적용 타당한 모델을 제안하였다. 아울러 우리나라 경제 환경자료를 사용하여 제안된 모델에 근거하여 평가한 피폭선량 금전가를 정상 운영시로부터 유도된 값을 수정없이 그대로 사고후 만성 피폭에 적용한 값과 비교, 분석하였다. 제안된 방법론에 근거할 경우 집단선량은 같다하더라도 피폭받은 집단내 개인선량의 불균일성 차이에 따라 피폭선량 금전가는 상당히 다르게 나타났다. 또한 할인율도 피폭선량 금전가 결정에 있어서 중요한 요소로 작용하였다.

• Toxicological Research
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• 제32권4호
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• pp.311-316
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• 2016

Effects of nanoparticles (NPs) on skin corrosion and irritation using three-dimensional human skin models were investigated based on the test guidelines of Organization for Economic Co-operation and Development (OECD TG431 and TG439). EpiDerm$^{TM}$ skin was incubated with NPs including those harboring iron (FeNPs), aluminum oxide (AlNPs), titanium oxide (TNPs), and silver (AgNPs) for a defined time according to the test guidelines. Cell viabilities of EpiDerm$^{TM}$ skins were measured by the 3-(4, 5-dimethylthiazol-2-yl)-2.5-diphenyltetrazolium bromide based method. FeNPs, AlNPs, TNPs, and AgNPs were non-corrosive because the viability was more than 50% after 3 min exposure and more than 15% after 60 min exposure, which are the non-corrosive criteria. All NPs were also non-irritants, based on viability exceeding 50% after 60 min exposure and 42 hr post-incubation. Release of interleukin 1-alpha and histopathological analysis supported the cell viability results. These findings suggest that FeNPs, AlNPs, TNPs, and AgNPs are 'non-corrosive' and 'non-irritant' to human skin by a globally harmonized classification system.

• 한국시스템다이내믹스연구
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• 제15권4호
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• pp.5-28
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• 2014

국제통상을 하는 기업은 위험 선호도에 따라 금융시장을 통해 외화자산 혹은 외화부채의 헷징(hedging)을 목적으로 파생금융상품을 쉽게 구매할 수 있다. 파생금융상품 시장은 투자와 헷지의 필요에 따라 급속도로 성장해왔다. 기업은 금융 파생금융상품을 통해 환위험 관리를 하면서 위험을 헷징한다. 기초자산을 헷징할 때는 환노출 완화전략으로 헷징이 효과적일 수 있다. 하지만 파생상품을 통한 이익에 대한 욕심과 예상치 못한 환율 변동이 발생할 때 기업에 상당한 위험을 초래할 수도 있다. 본 논문은 환위험을 다루는 파생상품에 내재된 구조적인 위험을 시스템다이내믹스 관점에서 분석하고 있다. 대표적인 파생금융상품인 KIKO는 구조적인 위험 요인 때문에 금융위기에 크나 큰 손실을 끼쳤다. 본 논문에서는 KIKO의 구조적 위험 요인을 모델링하고 실제 사례를 통해 검증하여 파생금융상품의 시스템 구조를 파악하고 내재되어 있는 구조적 위험을 밝혔다.

• 자원환경지질
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• 제38권5호
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• pp.535-545
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• 2005

본 연구에서는 폐금속광산 지역에서의 비소가 인체에 미치는 위해영향을 정량적으로 평가하기 위하여 동일, 옥동, 동정, 도곡 및 화천광산 주변 지역에서 광미, 토양, 농작물 및 지하수를 채취하여 화학분석을 실시하였다. 이들 폐금속광산 주변에 폐기된 광미내 비소 함량은 매우 높게 나타났으며, 이러한 광미가 바람이나 강우에 의해 광미댐 하부에 있는 농경지나 하천으로 유입되어 주변 환경을 오염시킬 가능성이 크므로 이들 토양, 농작물, 자연수 시료들에 대한 화학분석자료를 바탕으로 인체위해성평가 모델링을 실시하였다. 폐금속광산 지역에서의 인체노출경로는 농사활동을 통한 토양의 섭취, 지하수(식수)의 섭취, 쌀의 섭취, 농사활동에 의한 토양의 피부접촉, 목욕에 의한 지하수의 피부접촉 등 5가지로 파악할 수 있었다. 각 노출경로별 비발암성위해도 평가 결과, 모든 광산에서 지하수를 식수로 섭취하는 노출경로와 쌀의 섭취를 통해 비소의 독성위해도가 가장 높은 것으로 나타났다. 특히, 동일광산과 옥동광산에서는 HI지수가 7.0 이상으로, 화천광산의 경우는 5.0 이상으로 매우 높게 나타나 이들 지역 주민들의 비소의 독성위해성이 높았다. 비소에 대한 발암위해도 평가 결과, 동일광산, 옥동광산 및 화천광산 지역의 쌀 섭취의 노출경로를 통한 비소에 의해 암이 발생할 확률은 만명중의 5명에서 8명 정도로 높게 나타났다. 지하수를 식수로 섭취하는 경우, 비소의 발암위해도도 이들 광산지역에서 만명중의 1명보다 높게 나타났다. 이는 미국 EPA에서 제시한 초과발암위해도보다도 크므로 이들 지역 주민들이 비소에 의해 오염된 농작물(쌀)이나 지하수를 식수로 지속적으로 장기간 섭취하게 된다면 비소가 건강에 미치는 위해영향이 크다고 판단된다.warfarin 용량 조절에 유용할 것으로 생각된다.대한 치료 순응도가 높아졌다. 후 동율동 전환율이나 좌심방 수축능 회복에 좋은 결과를 보여주었다 그러나 향후 대상환자들에 대한 중장기적인 추적 관찰이 필요하리라 생각한다.pm1.6$일째에 관상동맥조영술을 시행하여 모든 도관의 개존율$(100\%=57/57)$을 확인하였다 수술 전 중재 술을 시행한 1개소에서는 중재술 부위의 재협착소견이 보여 수술 후 조영술시 재풍선확장술로 치료하였다. 수술 후 추적관찰(평균 $25\pm26$개월)동안 1예에서 심부전으로 사망하였다. 생존한 환자 24예에서 술 후 평균 $9.6\pm3$개월째에 관상동맥조영술을 시행하였고 이식도관이 string 징후를 보인 1예를 제외하고 모두 개존(56/57)되어 있었으며, 약물용출형 스탠트를 시행하기 이전의 12예의 중재술 중 2예에서 $50\%$ 이상의 스텐트 협착이 있었으나 흉통의 재발은 없었다. 결론: 하이브리드 관상동맥 우회 술은 수술위험도를 낮추기 위하여 최소절개 관상동맥우회술과 병합하여 시도될 수 있을 뿐 아니라, 선택적 환자들에서는 정중 흉골절개 관상동맥우회술과 병합하여 수술관련 유병률을 낮추고 심근의 완전 재관류화를 도모할 수 있었다.호도에서 가장 적절한 방법으로 사료된다.비위생 점수가 유의적으로 높은 점수를 나타내었다. 조리종사자의 위생지식 점수와 위생관리 수행수준의 상관관계를 조사한 결과, 위생지식의 기기설비위생은 위생관리 수행수준의 합계(p<0.01)에서 유의적인 상관관계(p<0.01)를 나타내었으며, 위생지식의 식중독 및 미생물은 위생관리 수행수준의 개인위생(p<0.01)과 유의적인

• 한국산업보건학회지
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• 제34권2호
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• pp.166-178
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• 2024

Objectives: The 12 occupational exposure limits(OELs) for chromium and its compounds in Korea were set by applying the American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Values (TLVs). However, this is significantly different from the TLVs after the existing TLVs were integrated and withdrawn in 2018, so it is necessary to review the revision. Methods: Various documents related to chromium OELs were reviewed, including the ACGIH TLV Documentations for chromium and its compounds. A field survey was conducted targeting workplaces handling chromium and its compounds. Based on this, a revised OELs were proposed and a socio-economic evaluation was conducted. Results: The OELs for chromium compounds in Korea was first enacted in 2002, and in 2007, the OELs for chromium (hexavalent) compounds (insoluble) was lowered from 0.05 mg/m³ to 0.01 mg/m³. In 2008, the OELs for strontium chromate was newly established as 0.0005 mg/m³, and in 2018, the OELs for calcium chromate was newly established as 0.001 mg/m³. Total chromium and hexavalent chromium were measured for each of 6 samples at 2 welding sites, 4 plating sites, and 2 spray coating sites. When omparing the average of the results measured by ICP, a total chromium analysis method, and the analysis results by IC, a hexavalent chromium analysis method, only workplace 4 was the same, and total chromium was evaluated more, and total chromium was evaluated at 0.0004 to 0.0027 mg/m³. And hexavalent chromium was evaluated as non-detection ~ 0.0014 mg/m³. Amendment ①: The exposure standard for hexavalent chromium is not divided into water soluble, insoluble, chromium ore processing, and other hexavalent chromium compounds, and is integrated into 0.01 mg/m³, which is the level of chromium (hexavalent) compound (insoluble)., OELs for chromium (metal) and chromium (trivalent) compounds are integrated into chromium (trivalent) compounds, and the exposure level is maintained. Amendment ②: As in the amendment ①, the OELs are integrated, but the level is lowered to 0.005 mg/m³, which is the OELs of OSHA, and there is a grace period of 4 years. Amendment ③: As in the amendment ①, the OELs are integrated, but the level is lowered to 0.0002 mg/m³, which is the exposure standard of ACGIH, and there is a grace period of 5 years. Conclusions: Amendment ①: The change in the OELs is insignificant, so the cost required is small, and the benefit/cost ratio is greater than 1, so there is no problem in applying the amendment. Amendment ②: In all scenarios except chromium 6(insoluble), the benefit/cost ratio is greater than 1, so it is thought that there will be no major problem in applying the amendment. Amendment ③: Since the benefit/cost ratio is less than 1 in all scenarios, it is thought that the total social benefit that can be obtained when applying the amendment is not large.