藥水에 서 分離한 大陽園群의 一部重金屬및 抗生齊l 耐性에 關한 硏究

鄭止淵(Jee Yeon Jeong),鄭文植(Moon Shik Zong) 한국환경보건학회 1989 한국환경보건학회지 Vol.15 No.1

The purposes of this study were to find out the heavy metal and antibiotic resistant coliform bacteria from mineral water and the resistant factors. For the experiment, mineral water samples were taken from A area and B area during the period from march to July, 1988. The results of the experiment were as follows; 1. From mineral water, eleven resistant coliforms and one susceptible coliform were isolated. 2. All resistant isolates harbored diverse plasmids of ranged ca. 14-54kb. 3. Susceptible coliform harbored a on1y plasmid of ca. 2.8 kb. 4. All resistant isolates harbored common size of plasmid of ca. 14kb. 5. As a result of the transformation and agarose gel electrophoresis experiments, resistant factor was R-plasmid. In conc1usion, It is suggested that heavy metal contamination of mineral water is the selective pressure for the plasmid encoding the tolerance. Heavy metal resistance, in some case , is present with antibiotic resistance. Therefore, heavy metal contamination of minera1 water induces antibiotic resistant bacteria.

대체용매를 이용한 금속가공유 측정방법 타당성 평가

정지연 ( Jee Yeon Jeong ),백남원 ( Nam Won Paik ) 한국산업위생학회 2006 한국산업보건학회지 Vol.16 No.2

The purpose of this study was to validate alternative method by using non-carcinogenic, and less toxic solvents than NIOSH analytical method 5524 for measuring the airborne MWFs in workplaces. In laboratory tests, the ETM solvents(mixture of same volume for ethyl ether, toluene, and ethanol) were selected. The alternative method of analyzing MWFs, referred to as the ETM solvent extraction method, showed 0.04 mg/sample as LOD, and 0.15 mg/sample as LOQ. The analytical precision (pooled CV, coefficient of variation) of the ETM solvent extraction method for analyzing the straight, soluble, semisynthetic, and synthetic metalworking fluid was 1.5%, 2.0%, 2.6%, 1.6%, respectively, which was similar to the precision (2.6%) of NIOSH analytical method (NIOSH 0500) for total dust. The analytical accuracy by recovery test, spiked mass calculated as extractable mass, was almost 100%. As the result of storage stability test, metalworking fluid samples should be stored in refrigerated condition, and be analyzed in two weeks after sampling. The 95% confidence limit of the estimated total standard error for the ETM solvent extraction method for analyzing the straight, soluble, semisynthetic, and synthetic metalworking fluid was ±12.6%, ±12.5%, ±14.0%, and ±13.6%, respectively, which satisfied the OSHA sampling and analytical criteria.

국내 농업의 선진화를 위한 LOK(Linked Open Knowledge) 구축 방안 연구

정지연(Jee-Yeon Jeong),정성훈(Seong-Hun Jeong),이새봄(Sae-Bom Lee),정재진(Jae-Jin Jung) 한국콘텐츠학회 2014 한국콘텐츠학회논문지 Vol.14 No.9

농업과 ICT(Information & Communication Technology)의 융합기술은 미래농업의 주요 요인으로 지목되고 있는 가운데 식량부족 및 식품 안전성 문제의 대안 책으로 주목받고 있다. 최근 들어, 국내 및 국제농업분야에서는 농작물 생육환경에 대해 ICT기술 중 빅데이터를 이용하여, 농업분야 환경을 개선하고자한다. 그러나 아직까지 국내 농업분야에서는 빅데이터 활용도가 낮으며, 농가별로 폐쇄적으로 운영하여 생육환경 데이터가 공유되지 않고 있다. 따라서 세계 10대 유망상업 중 하나로 꼽히는 빅데이터 활용과 더불어 개방형 지식 서비스화 할 수 있는 LOK(Linked Open Knowledge) 시스템이 필요하다. 본 연구는 국내외 생육환경과 빅데이터의 연구현황을 분석하고 국내 농업의 선진화 방안으로 농업 내의 빅데이터 구축 및 활용을 통한 농작물에 대한 LOK의 필요성을 알아보고, 제언하고자 한다. The convergence technology of ICT(Information & Communication Technology) in agriculture is the main key of the future agricultural industry. Recently, many that by using big data it can improve crop growth-circumstance and agricultural Industry. However, the data of crop growth-circumstance has been not shared and operated separately by individual farm. Therefore, it is necessary to build the LOK(Linked Open Knowledge) system for Quality of Farming & Farm product. We research previous studies for big data and development of the corp growth-circumstance using big data system case. Also, we suggest to build LOK system for improving the domestic agricultural industry.

섬오갈피나무 엽의 성분 연구

정지연(Jee-Yeon Jeong),한덕룡(Dug-Ryong Hahn) 한국생약학회 1991 생약학회지 Vol.22 No.1

증례보고 : 갑상선 전적출술 후 회복실에서 발견된 호흡곤란

정지연 ( Jee Yeon Jeong ),이소영 ( So Young Lee ),이현도 ( Hyun Do Lee ),석은하 ( Eun Ha Suk ),이수남 ( Su Nam Lee ),박동호 ( Dong Ho Park ) 대한마취과학회 2003 Korean Journal of Anesthesiology Vol.45 No.4

업무용 빌딩 소재 사무실의 실내환기 평가

정지연 ( Jee Yeon Jeong ),이광용 ( Gawng Yong Lee ),이병규 ( Byung Kyu Lee ) 한국산업위생학회 2008 한국산업보건학회지 Vol.18 No.2

In winter season, the survey was performed in three commercial office buildings in the metropolitan Seoul, Pusan, and Gwangju city. The purpose of the survey was to evaluate the effectiveness of ventilation for offices in commercial buildings. The data were compared to standard of applicable to the indoor ventilation in office. The results indicated that the most commercial office buildings used the air handing unit and fan coil unit as HVAC system, and the intake amount of fresh outdoor air were very inadequate to compared to the ASHRAE standard value of 0.57 ㎥/min/person. Also the surveyed all commercial office building used the HVAC system as a meas of controlling temperature for office indoor air. Ultimately, these results presented that there were possibility of evoking indoor air quality problems by the insufficient ventilation.

폭약 및 폭탄 제조시 발생하는 시클로나이트의 작업자 노출수준 평가

정지연 ( Jee Yeon Jeong ),이지현 ( Jee Hyeon Lee ),김은영 ( Eun Young Kim ),이승훈 ( Seung Hoon Lee ) 한국산업위생학회 2011 한국산업보건학회지 Vol.21 No.1

Cyclonite is a white powder and is very explosive. It can cause seizures (a problem of the nervous system) in human and animals when large amounts are inhaled or eaten. Research papers for workers exposure assesment of the cyclonite are very a few in the world. A field study was conducted at explosive compounds and bomb manufacturing companies to evaluate workers exposure to cyclonite. The airborne average concentration of cyclonite in explosive compounds manufacturing company was 4.10 ㎍/㎥(range: ND - 59.92 ㎍/ ㎥), and that of cyclonite in bomb manufacturing company was 31.49 ㎍/㎥(range: ND - 291.41 ㎍/㎥). Package process and assembly process in both companies were considered the high potential of exposure to cyclonite. Even though all airborne concentrations of cyclonite were lower than occupational exposure standard (MOEL: 500 ㎍/㎥), exposure to cyclonite can also occur through dermal contact during manufacture, handling, and clean-up of cyclonite. So control measures for protecting skin absorption of cyclonite were needed for preventing adverse health effect by cyclonite exposure.

우레탄 폼 제조방식에 따른 작업자의 디이소시아네이트 노출수준 평가

정지연 ( Jee Yeon Jeong ),박성욱 ( Sung Wook Park ),이지은 ( Jee Eun Lee ),이광용 ( Gwang Yong Lee ) 한국산업위생학회 2012 한국산업보건학회지 Vol.22 No.3

Objectives: Polyurethanes are usually formed by the reactions of liquid diisocyanate components with liquid polyol resin components. Although polyurethanes have advantageous properties, such as their versatility, the manufacturing process generates diisocyanates, which can cause asthma and respiratory irritation in exposed workers. This study compared the differences in diisocyante concentrations between two different (molded foam and slabstock foam) polyurethane foamanufacturing methods. Materials and Methods:: Active samples and direct reading samples of diisocyanates (MDI, TDI) were collected in five polyurethane foam manufacturing companies. Results:: Workers` exposure concentrations of diisocyanate (GM: 4.078 ppb, range: 1.190~23.770 ppb) in a slabstock foam manufacturing company were much higher than those (GM: 0.011 ppb, range: 0.001~0.055 ppb) in molded foam manufacturing companies. The results of the direct reading samples of diisocyanate indicated that the rapid reaction zone of the slabstock foam processes emitted large amounts of diisocyanates. Conclusions: The exposure levels of diisocyanates for all molded foam workers were much lower than the occupational exposure standard (5 ppb); however, exposure levels for many slabstock foam workers exceeded the standard.

수출입식물 훈증 작업자의 브롬화메틸 노출수준 평가

정지연 ( Jee Yeon Jeong ),이광용 ( Gwang-yong Yi ),조숙자 ( Sook-ja Cho ),박승현 ( Seung-hyeon Park ) 한국산업보건학회 (구 한국산업위생학회) 2020 한국산업보건학회지 Vol.30 No.1

Objectives: Methyl bromide is a highly toxic substance that can cause systemic poisoning, neurotoxicity, pulmonary edema. Methyl bromide is a widespread fumigation agent used for import and export quarantine, but there is little data on exposure assessment of workers participating in such fumigation. Therefore, this study aims to investigate the exposure level of methyl bromide among workers and the concentration distribution of methyl bromide in the workplace during fumigation. Methods: For this study, one wood tent and one container fumigation area in Pusan, and one wood tent fumigation area in Incheon were investigated over three months from June 2001. Results: Methyl bromide exposure levels for container fumigation workers were from undetected to 1.86 ppm and from undetected to 2.28 ppm for tent fumigation workers as an 8 hr TWA. After opening the container door, the methyl bromide concentration in the container decreased rapidly over time, but the concentration remained over 1 ppm even after about one hour. The concentrations around the tent during its removal were highly affected by wind, but were detected in a range from undetected to 11.97 ppm. Conclusions: This study confirmed that both container and tent fumigation caused workers to exceed the exposure limit of 1 ppm as an 8 hour TWA. In particular, it could be confirmed that a situation exists in which the worker may be exposed to high concentrations of methyl bromide when opening the container or removing the tent due to the nature of the work. Therefore, it is very important to improve working methods and to wear appropriate personal protective equipment.

우레탄 폼 제조 사업장 작업자의 디이소시아네이트 피부노출 평가

정지연 ( Jee Yeon Jeong ) 한국산업위생학회 2013 한국산업보건학회지 Vol.23 No.2

Objectives: Skin exposure to diisocyanates may be an important risk factor for respiratory sensitization to leading asthma. However little is known about the extent of worker’s diisocyanates skin exposure and the effectiveness of personal protective equipments in polyurethane foam manufacturing companies. This study provides data on diisocyanates skin exposure, surface diisiocyantes contamination of foams and the effectiveness of personal protective gloves in five polyurethane foam manufacturing companies. Materials and methods Colorimetric SWYPE pads are used for the determination of diisocyanates on surfaces of workers skin and polyurethanes foams. Results: The forearms, necks and faces of workers in polyurethane foam manufacturing companies were found to be contaminated with diisocyanates. Heavy contamination with uncured diisocyanates at large block foams surfaces were found. Personal gloves of workers for skin protection showed significant penetrations by diisocyanates. Conclusions: We found that all workers in polyurethane foam manufacturing companies could be exposed to diisocyanates by skin exposure. Also further researches which would better quantify skin exposure are needed.