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전철구 ( Cheol-ku Jeon ),장상환 ( Sang-hwan Jang ),윤경진 ( Kyung-jin Yoon ),정철희 ( Cheol-hui Jeong ) 국군의무사령부 2012 대한군진의학학술지 Vol.43 No.1
Objective : The Asbestos has been widely used in various occasions because of its superior physical properties with small expenses. But it has been associated with malignant mesothelioma or lung cancer with relatively long latency period. Use of asbestos was banned worldwide since 1980s. In Korea, the products with asbestos contents exceeding 1 % of total weight should be treated with caution by the authorized specialists. Because there are increasing concerns about the health risks associated asbestos dispersion during the renewal or dismantlement, we tried to elucidate the potential hazard of the military facilities in the ROK army. Method : The solid samples were analyzed by PLM(Polarized Light Microscope) and the airborne samples were analyzed by PCM(Phase Contrast Microscope). Results : Asbestos were found in 307(82.7%) out of total 371 samples. The 307 samples were chrysotile. A result of airborne asbestos was 0.521ea/㎤ of the 9 samples at a warehouse, which exceeds the exposure level(0.1ea/㎤). Conclusion : The exposure to the asbestos is rarely occurred during the ordinary activities. But the possibility of asbestos exposure increases during renewal or dismantlement or damage of the facilities. Therefore, to protect the health of the soldiers from the asbestos exposure, we should concentrate our efforts to find the hazardous places and to control the risks.
전철구 ( Jeon Cheol Koo ),윤경진 ( Yun Kyeong Jin ),이광진 ( Lee Gwang Jin ) 국군의무사령부 2013 대한군진의학학술지 Vol.44 No.1
Objective : IAQ(Indoor Air Quality) was measured during normal and training periods in military bunkers. This study was done to protect the health of workers and to improve indoor air quality. Method : We tested CO2, PM10, Total air borne microbes, Temperature and relative humidity during normal and training times. They were easily affected by human activity. We checked to see concentrations varied by time. Results : Training periods were statistically significant higher than normal(p<0.05). The highest concentrations were between 2∼4 p.m. Conclusion : Bunkers were highly contaminated by CO2 during military training. That means these was deficient ventilation. Therefore, highly contaminated locations and times is needed purification of IAQ. The IAQ measurement law is needed for some military facilities and bunkers.
전철구 ( Jeon Cheol Koo ),윤경진 ( Yun Kyeong Jin ),이광진 ( Gwang Jin Lee ) 국군의무사령부 2013 대한군진의학학술지 Vol.44 No.1
Objective : The purpose of this study was to protect the health of workers from radon hazards in military facilities Method : We chose 5 units and measured radon concentration in military bunkers from August, 2012 to November, 2012. The α-track was used to measure radon concentration. Results : The highest concentration of mean was 7.16±3.09 pCi/ℓ and the highest concentration was 18.12 pCi/ℓ(p<0.01). The exceed rate of radon was 5.9~89.4% by comparison recommended level. The mean of respective sites were 4.18±3.10 pCi/ℓ at basement facilities, 2.33±1.03 pCi/ℓ at 1st floor, 1.86±0.71 pCi/ℓ at 2nd floor(p<0.01). Conclusion : We should measure the radon concentration broadly in military facilities for other units. To protect workers health, we must make an effort to reduce radon concentration by ventilation and construction work in military bunkers.
알코올 의존 환자에서 사진자극과 문자자극에 대한 암묵적 연상검사 결과 비교
전철인(Cheol-In Jeon),이영렬(Young-Ryeol Lee),이 은(Eun Lee),이재원(Jaewon Lee),이수정(Soo Jung Lee),안석균(Suk Kyooun An),박진영(Jin-Young Park) 한국중독정신의학회 2010 중독정신의학 Vol.14 No.2
Objectives:The Implicit Association Test (IAT) is a paradigm designed to assess individual difference in implicit cognition. This study investigated the difference of IAT effect of alcohol related pictures and words in alcohol dependent patients, heavy drinkers and control subjects. Methods:23 alcohol dependence patients, 23 heavy drinkers and 22 controls were included. All subjects per-formed two IAT, one of which was composed of alcohol related pictures and the other was made of words. Results:Repeated measurement ANOVA showed significant main effect of ‘Type of stimuli’ [F(1,65)=29.38, p<0.001], and IAT effect was more prominent by words than pictures. But there was no significant interaction of ‘Type of stimuli’ and ‘Group’ [F(1,65)=1.466, p= 0.238]. In between group analysis, there was the significant main effect of ‘Gorup’ [F(2,65)=4.007, p=0.023], and control group had significantly negative implicit cognition to alcohol than heavy drinker group. Conclusion:IAT effect was marked in alcohol related word than picture. But IAT effect pattern of each group was not changed by stimulus. Overall alcohol related word and picture show difference in IAT effect power but both alcohol related picture and word IAT was useful for estimate alcohol related implicit cognition.
탄소-수소 결합 활성을 이용한 1,5-헥사디엔의 하이드로아실화반응 연구
전철호,한종수,김선일,Jeon, Cheol Ho,Han, Jong Su,Kim, Seon Il 대한화학회 1994 대한화학회지 Vol.38 No.11
8-Quinolinecarboxaldehyde (1)와 1,5-hexadiene (2)을 월킨슨 촉매(3)와 $AgBF_4(8)$의 혼합 촉매에서 반응시키면 8-quinolinyl 5-hexenyl ketone(4)와 8-quinolinyl 5-hexen-2-yl ketone (9)이 높은 수율로 반응초기에 생성된다. 가지달린 alkenyl 케톤인 9가 생성되는 이유는 월킨슨 촉매와 $AgBF_4(8)$의 반응에서 촉매에 빈 배위공간이 만들어져 1,5-hexadiene의 하이드로메탈레이션반응에서 $AgBF_4(8)$를 넣지 않았을 때보다는 입체장애가 적은 5.5각형의 중간체를 만들 수 있기 때문으로 설명된다. $AgBF_4(8)$의 사용량이 많으면 많을수록 9가 4보다 많은 비율로 생성되며, 장시간과 고온에서는 생성된 9와 4의 혼합물이 10과 5의 내부올레핀을 함유한 alkenyl 케톤으로 이성질화반응이 진행됨을 관찰할 수 있었다. 특히 고온으로 반응을 진행시킬수록 8-quinolinyl cyclopentylmethyl ketone (11)의 생성이 눈에 띄게 높아짐을 알 수 있었다. 8-Quinolinecarboxaldehyde (1) reacted with 1,5-hexadiene (2) in THF under Wilkinson's catalyst(3) and $AgBF_4(8)$ to give a mixture of 8-quinolinyl 5-hexenyl ketone (4) and 8-quinolinyl 5-hexen-2-yl ketone (9) at initial reaction stage. The reason for the formation of the branched alkenyl ketone 9 is supposed to be that the vacant coordination site, generated from Wilkinson's catalyst and $AgBF_4(8)$, makes it possible to form the 5.5 membered ring metallacycle intermediate. The higher the concentration of $AgBF_4(8)$ was used, the greater the ratio of 9 to 4 was observed. Longer reaction time and high temperature induced isomerization of 9 and 4 to 10 and 5. Especially the high reaction temperature increased the possibility of cyclization of the 5-hexenyl metal intermediate to give 8-quinolinyl cyclopentylmethyl ketone (11).