확산포집기로 공기중 ppb 농도수준의 휘발성유기물질 포집시 확산길이와 기류변화가 시료포집속도에 미치는 영향

변상훈,톰 스톡,마리아 모란디,아프샤,제이 크로스 한국산업위생학회 2001 한국산업보건학회지 Vol.11 No.1

Passive samplers have been used for personal, indoor, and outdoor air monitoring of VOCs at ppb concentrations in community and office environments. The path length of modified passive sampler was shortened, so it was intended to increase an uptake rate. The performance of the modified 3M 3500 organic vapor monitor(OVM) as a tool for assessing exposures to toxic air pollutants in nonoccupational community environments was evaluated using combined controlled test atmospheres of six selected target volatile organic compounds(VOCs): benzene, methyl tert-butyl ether(MTBE), chloroform, 1,4-dichloro-benzene, tetrachloroethylene, and toluene. The experiments were conducted by exposing the dosimeters to concen-trations of 50∼100 ㎍/㎥ on six velocity(0.00, 0.02, 0.06, 0.12, 0.20. 0.30 m/sec) for 24 hours. IF the uptake rate was increased, that means that we could use the passive sampler more effectively. The uptake rates were increased linearly according to reduce the path length. Although the diffusion path length was shortened, the change of uptake rate was with ±25% of theoretical value, in-dicating that the modified passive sampler(TM) can be effectively used over the range of concentrations and enviro-nmental conditions tested with a 24-h sampling period if the face velocities were over 0.12㎧ for 6 components of VOCs. But when the face velocities were less than 0.12㎧, uptake rates were reduced more than expected values. So, the passive sampler with the shortened path length should be used at indoor or outdoor environment where the face velocity should be over about 0.10 ㎧. If the path length was shortened more, the uptake rate was more effected by starvation.

실내·외 공기 중 휘발성 유기용제 포집을 위한 확산형 시료포집기의 성능변수에 대하여

변상훈 高麗大學校 倂設 保健大學 保健科學硏究所 1999 保健科學論集 Vol.25 No.1

Charcoal-based diffusive organic vapor monitors(OVMs) originally designed for sampling occupational exposures are increasingly being utilized to measure outdoor, indoor, and personal air concentrations of volatile organic compounds(VOCs). There has been very limited evaluation of the performance parameters of OVMs for use in nonoccupational environments where, typically, concentrations of VOCs are more than one order of magnitude lower than those found in usual industrial settings. The results of an extensive laboratory and field evaluation of the 3500 OVM(3M Company, St. Paul, MN, USA) indicate that OVMs can be used in community environments with 48-hour exposure durations with extensive modification of the extraction and analysis procedures. The OVM performance parameters for this type of application are presented, including analytical and method detection limits(MDLs), extraction efficiencies at ㎍-level loading, and optimum sampling times for indoor, outdoor and personal air monitoring in community environments.

국산 확산포집기를 이용한 기중 포름알데히드 농도 측정 및 평가

변상훈,임채현,손종렬 高麗大學校 倂設 保健大學 保健科學硏究所 2002 保健科學論集 Vol.28 No.1

The purpose of this study is to investigate if some formaldehyde exists in DONG DAE MOON cloth or dry goods markets, and also to alalyze the function of sampler on the hypothesis that are some formaldehyde in those places. More importantly we did not use the existing method by active sampler but we used the new diffusive sampler that we made. 1. The result of this study showed that some formaldehyde existed in DONG DAE MOON cloth and dry goods markets. Average concentration of formaldehyde was 0.136ppm 2. On the basis that the ministry of labor in Korea recommended the Permissible Exposure Limit(PEL) as 0.1ppm, the value of 0.136ppm exceed the PEL. In conclusion, more many stydies about how formaldehyde effects on human body and what diseases that material cause in the body should be proceeded in addition more stydies using diffusive sampler will be needed in the future

일부 반면형 호흡기보호구 착용시 안면 크기 및 성별에 따른 밀착도 변화

변상훈,문경환,손종렬,김영환,배은상 高麗大學校 倂設 保健大學 保健科學硏究所 2000 保健科學論集 Vol.26 No.1

The fit of a respirator to the Face of an individual can be determined by a qualitative fit test((QLFT) or a quantitative fit test (QNFT). A quantitative fit test, was performed to evaluate leak values with Mask Fitting Tester. Two brands of half face respirators(M,S) were tested on 110 wearers on time. This study was investigated how the fit factors resulting from a quantiative fit test (QNFT) depend on the movements in the six test exersize regimes. Fit factor were low when face lengthes were higher or lower than average values. In this research we studies the koean's face length and compared the result with one of the American and the Japanese after wearing the Half-Mask Respirators, some changes in their leak were found and the results were as follows. 1. Although most testee were young, the Korean's face length were similar to the American while the male face length were similar to the Japanese. 2. For men, thier face length has been longer about by 1㎝ but mouth's length shorter about by 0.3㎝ than 10 years ago. 3. If the face length were not normality (such as higher or lower) leak degree was too high to be appropriate for the Respirator. 4. Both M and S company their respirators showed that the male leak degree was two times lower than female. Therefore, the resporators in the current market were believed to forcus it's target for male consumers. 5. The result of QLFT in a male showed that pass% of M was 20% higher than S. 6. In the result of QLFT, pass% of S was 25% highr than M in a female 7. These results(5&6) showed that S were more suitable in a female and M were more suitable in a male

아파트 실내에서 시간 경과에 따른 포름알데히드의 농도 조사

변상훈,김영환,손종렬,문경환 高麗大學校 倂設 保健大學 保健科學硏究所 2002 保健科學論集 Vol.28 No.1

Our communities have been exposed to polluted air. Polluted air could cause the serious injury such as respirational impediment, disease and so on, and the air pollution could be most serious problem in our life. Unfortunately, we didn't have consider these problems seriously, and we had make no solutions for these problems. The new apartment was shown higher concentrations for formaldehyde than the old apartment, that indicated the new apartment environment was more polluted.

법랑아세포종의 임상병리학적 연구

성일용,류성호,신상훈,김욱규,김종렬,정인교,변기정 大韓顎顔面成形再建外科學會 2003 Maxillofacial Plastic Reconstructive Surgery Vol.25 No.1

The authors analyzed retrospectively the 60 patients with ameloblastoma who were treated at Department of Oral and Maxillofacial Surgery, Pusan National University Hospital from MArch, 1990 to December, 1995. The results obtained were as follows: There were 26 males (43.3%) and 34 females (56.7%). The peak age of patients was the third decade (41.7%). The majority of cases occurred in the mandible 93.3%, especially in the angle region (91.1%). Eighteen of 60 patients (30.0%) were associated with an impacted tooth, by impacted 3rd molar teeth (16.6%), molar (10.0%), and premolar and canine (3.4%) in order., Fifteen of 60 patients (25%) were associated with an odontogenic cyst, by dentigenous cyst(13.3%), odontogenic keratocyst(8.4%), and radicular cyst(3.3%) in order. Radiographically, there were 32 unilocular types(54.2%) with average age of 24.9±10.8 years, 14 multilocular types(23.7%) with average age of 35.7±17.7 and 13 mixed types(22.0%) with average age of 41.4±15.8. Histopathologically, there were 42 follicular types(70.0%) with average age of 33.7±15.1 years and 18 plexiform types(30.0%) with average age of 26±14.6. Conservertive treatment was performed in the 33 patients(55.0%) and their average age was 25.2±13.9 years and radical treatment in the 27 patients(45.0%) and their average age was 39.3±41.8. Overall recurrence rate was 10%. A consistent correlation between the age of the patient and the radiographic or histologic type of mandibular ameloblastoma was observed. There was a tendency for ameloblastomas of the follicular type to show a multilocular or mixed appearance and for those of the plexiform type to show a unilocular appearance.

신체활동이 지체장애인의 자아정체감에 미치는 영향

유건성(Geon Sung Yoo),변재훈(Jae Hoon Byeon) 한국체육교육학회 2009 한국체육교육학회지 Vol.14 No.1

The purpose of this study was self-identity of individuals with physical disabilities participating in physical activity. Subjects included 198(male: 143 female: 58) with individuals with physical disabilities. The questionnaire that was developed by Park Ah-Chung(1996) was used self-identity scale of Korean. It was revised by Lee Sung-Guk(1999) which consisted of 6 factors, 48 items. Construct validity of the instrument was checked by Factor analysis. Reliability of questions was confirmed by Cronbach`s α value(.783). The data analysis were Independent t-test, one-way ANOVA, and multiple regression analysis. The results were as follows; First, job and incomes had significant effects on self-identity of individuals with physical disabilities. Second, physical instructors, mass media, and friends had significant effects on self-identity of individuals with physical disabilities. Third, physical activity period, group exercise, and athletes with disabilities had significant effects on self-identity of individuals with physical disabilities. Fourth, high understanding of disability traits significant difference than low understanding of disabilities traits on self-identity of individuals with physical disabilities. These results implied that individuals with physical disabilities participation in physical activity had significant effects on their self-identity according to socio-demographic variables, significant other, type of physical activity, participation type of physical activity, and understanding of disability traits.

THI에 의한 서울시 지하철 역사 근로자의 신체 및 심리적 증상에 관한 연구

손종렬,김선철,변상훈,문경환,김영환 한국산업위생학회 2003 한국산업보건학회지 Vol.13 No.2

This paper reports an investigaion for the health status of subway workers in the 67 subway stations in the Seoul area during from September 15th to Nobimber 15th, 2002 . Prevalence of subuective complaints was surveyed of 400 subway workers applied by a general health questionnaire-the Todai Health index(THI). The basic tool employed in this present study was the THI which is modified Comell Medical Index(CMI) and was developed by Tokyo University Research Team in Japan, and had been used to evaluate manufacturing workers, iron workers and other workers by Kim(1979), Chung(1982), Lym(1987), Lee(1996) in Korea. The results were summarized as follows; 1. The physical and psychological complaints were much higher in the 20~29 age group than other age groups. 2. The physical and psychological complaints showed a high tendency of increased incidence in all items as length of service decreased, and the 3~5 years group was higher than less 1 year group with regard to the symptoms of Digestive(C), Aggressiveness(F), Nervousness(E). 3. The physical and psychological complaints showed much higher tendency in the station staff(S?S) group than other groups. 4. The physical and psychological complaints showed much higher tendency in the under station(Un.S) and upper station (Un.S) groups than other groups. 5. The responses of physical and psychological complaints by monthly pay showed much higher tendency in he income of 10.1~1.50 millions won group than other groups. 6. The responses of physical and psychological complaints by smoker or non-smoker showed much higher tendency in the smoker group than non-smoker group. Therefore, it can be concluded that the worker of subway studied was perceived as acceptable the importance of health status, and suggested that the goverment of related subway need to be effort to control the health of subway workers in environment of indoor.

일부 서울지역 실내.외 공기중 휘발성 유기화합물질(VOCs)의 농도조사

정제면,손종렬,유인성,변상훈 高麗大學校 倂設 保健大學 保健科學硏究所 2001 保健科學論集 Vol.27 No.1

Our communities have been exposed to polluted air. Polluted air could cause the serious injury such as respirational impediment, disease and so on, and the air pollution could be most serious problem in our life. Unfortunately, we didn't have consider these problems seriously, and we had make no solutions for these problems. Although the concentration of indoor and outdoor didn't show the high values, VOCs existed in indoor and outdoor environment. The indoor concentration was more higher concentration than the outdoor concentration, that indicated the indoor environment was more polluted. This study showed that the investigation of a continuous environment polluted were needed.

시중에 판매되고 있는 아이스크림의 일반세균 및 대장균군 오염 실태

정다운,김영환,손종렬,변상훈 高麗大學校 倂設 保健大學 保健科學硏究所 2003 保健科學論集 Vol.29 No.1

Ice cream is a vastly consumed food enjoyed by a wide range of people. Therefore, it is easily accessible and amounts to hundreds of its kind. Ice cream is a ready-made food which could be served without undergoing cooking process and thus putting weight on its hygienic condition. And so we set out to conduct some research on the number of E-coli bactria contained in commercially sold ice creams. We applied Lactose broth method along with Desoxycholate agar method which enables us to verify the existence of E-coli bacteria and how much is contained. We focused our research on soft ice creams and aimed to seek out the degree to which they were contaminated by E-coli bacteria. 4 major distributors of soft ice cream out of 5 didn't meet the maximum allowance of E coli bacteria to be found. The number of general bacteria observed per 1 ㎖ of specimen must be held at less than 100,000, and this wasn't violated by any of the companies' samples. Yet on E-coli testing, all of K, L, B and M companies' samples respectively exceeded the permitted limits of bacteria to be detected.