• 한국환경보건학회지
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• 제41권5호
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• pp.277-288
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• 2015

Objectives: There are many hazardous agents at livestock farms. In particular, gases can be detrimental to both workers and animals. This study evaluated ammonia and hydrogen sulfide concentrations in broiler hen barns and beef cattle barns according to sampling location and height. Methods: Three broiler hen barns and three beef cattle barns were selected for gas monitoring in this study. Ammonia and hydrogen sulfide concentrations were measured using a direct-reading instrument which could measure the target gases simultaneously. Gas monitoring was conducted at human breathing height and animal breathing height at three points in each livestock farm. Results: Ammonia concentrations at the broiler hen barns ranged from 3.3 to 12.5 ppm by sampling location and height, but hydrogen sulfide was not detected. In the beef cattle barns, ammonia ranged from 3.1 to 16.3 ppm and low concentrations of hydrogen sulfide were detected at some animal breathing heights. The gas concentrations detected at each livestock farm were significantly higher in the animal breathing zones than in human breathing zones (p<0.0001). Conclusions: We found a difference in gas concentrations between human breathing zones and animal breathing zones. Gas monitoring should be conducted to improve the related environment considering both workers' and animals' health and safety.

• Safety and Health at Work
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• 제9권3호
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• pp.352-355
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• 2018

Hazardous work zones (i.e., hot, warm, and cold) are typically established by emergency response teams during hazardous materials (HAZMAT) calls but less consistently for fire responses to segment personnel and response activities in the immediate geographic area around the fire. Despite national guidelines, studies have documented the inconsistent use of respiratory protective equipment by firefighters at the fire scene. In this case-series report, we describe warm zone gas levels using multigas detectors across five independent fire incident responses all occurring in a large South Florida fire department. Multigas detector data collected at each fire response indicate the presence of sustained levels of volatile organic compounds in the "warm zone" of each fire event. These cases suggest that firefighters should not only implement strategies for multigas detector use within the warm zone but also include respiratory protection to provide adequate safety from toxic exposures in the warm zone.

• 한국환경보건학회지
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• 제44권3호
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• pp.283-292
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• 2018

Objectives: This study was conducted to identify hazardous factors that reflect the characteristics of the academy and to provide basic data of environmental safety standard. Methods: Heavy metals, volatile organic compounds, formaldehyde, pesticides and phthalates were measured in 20 academies, which were supplementary, music, art and physical education institutes. Results: In case of heavy metals, the 12 locations were detected for lead (Pb) over the standard value, and 15 locations were exceeded for the total heavy metal. In six locations, the concentrations of volatile organic compounds were exceeded the standard value of $400{\mu}g/m^3$, and two locations for formaldehyde were exceeded the standard value of $100{\mu}g/m^3$. The most commonly detected agents in the air dust were chlorpyrifos and diazinon. The concentrations of DEHP, DINP, and DBP were detected and exceeded in several academies, The risk assessment results showed that HCHO as carcinogen had a safety level of 10-7 to 10-6, and DEHP and DINP as non-carcinogens had a safety level as assessed to be under than 0.1. Conclusions: Through the investigation of long-term environmental and health effects related laws on academies, indoor air quality management might be needed because there were cases of exceeding standard.

• 한국정보통신학회논문지
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• 제25권9호
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• pp.1244-1253
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• 2021

본 논문에서는 보행자 경로 예측 기법을 이용하여 보행자들이 현재 시점 이후로 위험구역으로 진입하는지 사전에 예측하는 방법과 경로 예측 네트워크의 효율적인 간소화 방법을 제안한다. 그리고 임베디드 환경에서 실시간 운용을 위해 작은 네트워크에 대하여 KD(Knowledge Distillation)을 적용하는 방법을 제안한다. 예측된 미래 경로와 위험구역 간의 상관관계를 이용하여 진입 여부를 판단하였으며 작은 네트워크를 학습할 때 효율적인 KD를 적용하여 성능저하를 최소화하였다. 실험을 통하여, 제안하는 간소화 기법을 적용한 모델이 기존 모델과 비교하여 37.49%의 속도향상 대비 미미한 정확도 저하를 이끌어 내는 것을 보여 주었다. 또한, 91.43%의 정확도를 가진 작은 네트워크를 KD를 이용하여 학습한 결과 94.76%의 향상된 정확도를 보임을 확인하였다.

• 대한안전경영과학회지
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• 제14권4호
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• pp.169-175
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• 2012

Self-Inspection is being used in the workplace hazardous, dangerous machinery and equipment to build capacity for the voluntary safety risks due to use of machinery and prevention of industrial accidents that inspect facilities for safety issues, is to check. However, December 31, 2008 as part of Article 36 of the Occupational Safety and Health Act (safety inspection), the financial vanish as the self-test, Safety inspection program has been changed., In each individual workplace that creates its own standards and regulations to use the existing inspection system is in some cases. This study is located in the southeast industrial complex as a risk reducer manufacturer, machine-based target zones in S Corp owns most of the crane based on the results of the tests is to analyze the problem. Then check the results - to bring its measures and information you need to know for sure is to propose.

• 한국식품조리과학회지
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• 제27권4호
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• pp.17-26
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• 2011

본 연구는 지유 에탄올 추출물의 항균 및 항돌연변이 활성을 측정하여 새로운 기능성 소재로서의 기초자료를 얻고자 실시하였다. E. coli, E. coli O157:H7, P. aeruginosa, S. Typhimurium, L. monocytogenes, B. cereus, S. aureus의 7가지 주요 식품위해성 세균에 대한 항균활성을 검증하기 위해 paper disc diffusion assay 및 최소저해농도를 측정하였으며 24시간 동안 균의 생육억제도를 측정하였다. Paper disc assay 결과 E. coli와 E. coli O157:H7을 제외한 5가지 균에 대한 지유 에탄올 추출물의 뚜렷한 clear zone이 확인되었다. Micro-well dilution법으로 확인한 최소저해농도의 범위는 E. coli와 E. coli O157:H7을 제외한 5가지 균에 대해서 0.625~2.5 mg/mL로 나타났으며 생육억제도 실험결과도 최소 저해농도 결과와 일치하였다. Salmonella Typhimurium TA100을 이용한 Ames test 결과, 5 mg/plate의 농도에서 직접 돌연변이원인 sodium azide와 4-NQO에 대한 지유 에탄올 추출물의 항돌연변이 활성이 각각 72.42와 89.85%로 나타나 지유 에탄올 추출물의 우수한 항돌연변이 활성을 확인하였다. 본 연구를 통해 지유 에탄올 추출물이 주요 식품위해성 세균들에 대한 우수한 항균성과 직접돌연변이원에 대한 높은 항돌연변이 활성을 나타내어 천연물 유래 생리활성 소재로 이용될 수 있는 가능성을 보여주었다.

• 한국환경보건학회지
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• 제45권1호
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• pp.54-61
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• 2019

Objectives: In this study, we investigated an assessment for exposure levels of hazardous substances to kids cafes that unregulated by law. Methods: Heavy metals, volatile organic compounds, formaldehyde, pesticides and phthalate were measured at 20 kids cafes in Gyeonggi-do and Incheon. Samplings were conducted from April to July in 2018. Results: Heavy metals were detected over the standard mainly around the floor and walls in the 19 kids cafes. Pesticides were detected in 7 locations with chlorpyrifos, diazinon and cypermethrin, and showed the highest detection level of chlorpyrifos. The concentrations of DEHP in all kids cafes were exceeded with standard. The risk assessment results showed that HCHO as carcinogen had a safety level and DEHP as non-carcinogens had a safety level as assessed to be under than 0.1. Conclusions: Considering the exposure investigation results and the importance of child health protection, kids cafe should be included in the legal management list of children's activities zones.

• 지구물리와물리탐사
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• 제11권4호
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• pp.368-372
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• 2008

이 연구는 카르스트 지역에서 발생하는 연약층 또는 지하 석회암 공동의 영상화를 위한 지표 전기비저항 탐사의 유용성을 파악하고자 수행되었다. 연약층 또는 공동은 잠재적인 위험성을 가지고 있으며, 이들은 도로 및 건축물의 붕괴를 야기한다. 따라서 이 연구에서는 이미 지반침하가 있었음이 보고된 바 있는 전남 무안군 영월리에 있는 한 도로를 따라 2-3차원 전기비저항 탐사를 수행하여 지반 침하 현상을 조사하였다. 이 지역의 쌍극자배열 전기비저항 탐사 결과, 풍화된 표토층과 연약층 또는 공동 그리고 기반암이 뚜렷이 구분되어 나타났으며, 또한 여러 곳의 저비저항 이상대가 나타났는데 이는 점토로 충전된 공동으로 시추결과 확인되었다. 아울러 시추 결과와 전기비저항 탐사 결과는 매우 일치함을 알 수 있었다. 따라서 지반 침하를 평가하는 데 있어 전기비저항 탐사를 통한 지하영상화 작업이 매우 높은 분해능을 가짐을 알 수 있었으며 또한 지반 침하 지역을 조사하고 이를 평가함에 있어 $2{\sim}3$차원 전기비저항탐사가 매우 유용함을 확인할 수 있었다. 이러한 탐사 결과를 바탕으로 연구지역 주변의 재해 취약정도를 작성하였다.

• 한국안전학회지
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• 제33권5호
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• pp.51-59
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• 2018

It is difficult to determine the outdoor toxic level of hazardous chemicals that are leaked in the building, since there are no efficient ways to calculate how much percentage of the leaked chemicals is released into the outdoor atmosphere. In address to these problems, we propose a reasonable box model that can quantitatively evaluate the mass rate of the indoor chlorine leakage into the outside of the building. The proposed method assumes that the indoor chlorine leakage is fully mixed with the indoor air, and then the mixture of the chlorine and indoor air is exfiltrated into the outside of the building through effective leakage areas of the building. It is found that the exfiltration rate of the mixture of the chlorine and indoor air is strongly dependent on the temperature difference between inside and outside the building than the atmospheric wind speed. As compared with a conventional method that uses a vague mitigation factor, our method is more effective to evaluate the outdoor toxic threat zone of the chlorine that are leaked in the building, because it can consider the degree of airtight of the building in the evaluation of the threat zone.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2003년도 추계학술발표회
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• pp.368-371
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• 2003

Accidental release of petroleum products from underground storage tank(USTs) is one of the most common causes of groundwater contamination. BTEX is the major components of fuel oils, which are hazardous substances regulated by many nations. In addition to BTEX, other gasoline consituents such as MTBE(methyl-t-buthyl ether), anphthalene are also toxic to humans. Natual attenuation processes include physic, chemical, and biological trasformation. Aerobic and anaerobic biodegradation are believed to be the major processes that account for both containment of the petroleum-hydrocarbon plum and reduction of the contaminant concentrations. Aerobic bioremediation has been highly effective in the remediation of many fuel releases. However, Bioremediation of aromatic hydrocarbons in groundwater and sediments is ofen limited by the inability to provide sufficient oxygen to the contaminated zones due to the low water solubility of oxygen. Anaerobic processes refer to a variety of biodegradation mechanisms that use nitrate, ferric iron, sulfate, and carbon dioxide as terminal electron accepters. The objectives of this study was to conduct laboratory-scale microcosm studies in assessing enhanced bioremediation potential of BTEX and MTBE under various electron accepters(aerobic, nitrate, ferric iron, sulfate) in contaminated Soil. these results suggest that, presents evidence and a variety pattern of the biological removal of aromatic compounds under enhanced nitrate-, Fe(III)-, sulfate-reducing conditions.