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신경행동학적 증상 설문지의 타당도 및 신뢰도에 관한 연구
권호장,조수헌,임현술 大韓産業醫學會 1995 대한직업환경의학회지 Vol.7 No.1
유기용제 폭로에 의한 신경행동학적 장애를 선별 검사 할 수 있도록 고안된 설문지의 타당도와 신뢰도를 검정할 목적으로 유기용제를 사용하는 페인트 제조공장과 유기용제를 전혀 사용하지 않는 코일제조 공장의 근로자를 대상으로 2차에 걸쳐 설문조사를 실시하여 다음과 같은 결과를 얻었다. 1. 유기용제 폭로 근로자들이 비폭로 근로자들에 비해 증상총점의 평균이 통계적으로 유의하게 높았으며 이 결과는 나이, 근무기간, 교육연한, 음주, 흡연 등의 교란 요인을 통제하고도 유지되었다. 2. 신뢰도를 보기 위하여 페인트제조공장 근로자를 대상으로 2개월 간격으로 시행한 검사-재검사에서 문항별 kappa값은 0.15-0.69의 범위안에 있었으며 0,4이상으로 비교적 일치도가 높은 문항은 31문항 중 16문항이었다. 3. 검사문항간에 내적 일치도를 보기 위하여 Cronbach Alpha계수를 구한 결과 분포를 표준화하기 이전에는 0.85, 분포를 표준화한 이후에는 0.86의 값을 보였다. 이상의 결과를 볼 때 본 연구에 사용된 설문지는 유기용제 폭로로 인한 신경행동학적 장애를 비교적 잘 반영하고 있으며 신뢰도도 비교적 높은 것으로 판단되었다. There are many studies on the neurobehavioral symptoms due to organic solvent exposure using questionnaire. However there is little published evidence on validity and reliability of the questionnaire on the neurobehavioral symptoms. In present study, the authors tested the validity and reliability of our questionnaire, which was designed for screening neurobehavioral disturbance in organic solvent exposer. Questionnaire was administered to the workers of one paint manufacturing plant and one coil manufacturing plant. In order to evaluate validity of the questionnaire, the average questionnaire scores of two plants were compared. The average score of paint manufacturing plant were higher than that of coil manufacturing plant and the difference was statistically significant. After adjustment of age, duration of employment, education, smoking history and alcohol consumption, significance was maintained. Test-retest reliability was evaluated by kappa statistics. More than 50% of question items showed values of kappa above 0.4. Cronbach coefficient alpha which reflects internal consistency of the questionnaire was 0.86. Overall the data showed that validity and reliability of the questionnaire were generally acceptable.
혼합기의 점화특성에 미치는 SPARK PLUG 전극형상의 영향에 대한 연구
金良述,송호준 홍익대학교 산업기술연구소 2001 産業技術 Vol.11 No.-
To clarify effects of spark electrode configuration on spark ignition characteristics of combustible mixtures, ignition capability of the following spark plugs was studied ; a conventional spark plug(C plug), a V-grooved plug(V plug), a platininum plug, and a tapered platininum plug (T-Pt plug), and a tapered platinium plug (T-Pt plug). Moreover, numerical simulation was made to estimate the amount of heat loss from flame kernels to spark electrodes. The experimental results show that the T-Pt plug, Pt plug, V plug are put in order of ignition capability. This order is wall explained by the calculated result.
이호영,이은설,신승철 大韓神經精神醫學會 1990 신경정신의학 Vol.29 No.4
Recognizing the problem of under-reporting of suicide on death certificates, this study analyzes suicide data from police investigation records for the last twenty years. About two times more suicide deaths are reported to the police than in the vital registration system. Although one may expect to see a rise in suicide mortality due to improved reporting during the period of economic development, the police statistics clearly show a steady decline since 1975. The trends are examined based on directly standardized suicide mortality rates. The rate fluctuated at a high level(30 per 100,000 ; 40 for males and 18 for females) during early period of economic development(1965-1975) and declined steadily to 15 per 100,000 in 1988(20 for males and 9 for females). The decline is more dramatic in the standardized rates than in the crude rates, indicating that the declining birth rate is masking falling suicide rate. The decline is evident in all ages with a marked drop in ages 20-50. The gender differences in suicide mortality seem consistent over time but the lethal means of committing suicide are changing. Although the use of firearms is rare, poisoning by medical substance or chemicals accounts for about 50 percent of suicide deaths. However, the role of poisoning is waning as lethal chemicals are less readily accessible to the public, whereas strangulation and suicide by domestic gases are increasing. Although methodological problems are inherent in using police records, our analyses suggest that the suicide mortality rate had declined in Korea in recent years. This will provide an opportunity to study factors influencing the change. Further analyses of police statistics by geographic characteristics and an examination of relationship between suicide and homicide and accidents would be helpful in unraveling important psychiatric and public health implications.
MgB₄O7 熱螢光體의 특성과 低에너지 X線의 線量測定
김영국,손인호,설정식,채건식,노경석 慶南大學校 附設 基礎科學硏究所 1997 硏究論文集 Vol.11 No.-
To develope the thermoluminescent radiation sensors and low energy X-ray of dosimetry. The TL phosphors of MgB₄O7 are prepared and their physical characteristics are investigated. MgB₄O7 : Tb. Tm. Dy. La. Ho. and Nd phosphors have been prepared by sintering around 580℃ for 2 hours followed by flowing Ar gas. Ar gas. Activation energy and kinetic order of main peak of glow curve were studied by two methods peak shape method and initial rise method. By these methods, the estimated activation energies were 0.76±0.02eV(Tb doped). 0.94±0.03(Tm doped). 0.72±0.02 (Dy doped). respectively. The activation energy frequency factor and kinetic order of thermoluminescent process for each TL phosphors are measured by analyzing the glow curve by initial rise. peak shape. different heating rate. isothermal decay method. And The emission spectra of TL phosphors are also measured. The TL phosphors prepared in this work may be utilized to radiation sensor elements becaue of their high sensitivity to low energy X-ray.
DNA damage in T- and B-lymphocytes of rats exposed to benzene
Sul, Dong-Geun,Lee, Do-Young,Jo, Gyu-Chan,Im, Ho-Sub,Hong, Hyun-Ho,Jo, Duk-Jin,Kim, Chan-Wha,Kim, Hae-Joon,Lee, Eun-Il Korean Environmental Mutagen Society 2002 한국환경성돌연변이·발암원학회지 Vol.22 No.4
Single cell gel electrophoresis assay was carried out to evaluate DNA damage in T-and B-lymphocytes from rats exposed to benzene and the correlation between DNA damage and the level of t,t-muconic acids, which are urinary benzene metabolites, was investigated. In control rats, the mean values of Olive tail moments in T-and B-lymphocytes were 1.507$\pm$0.187 and 1.579$\pm$0.206 respectively. DNA damages of T-lymphocytes in rats exposed for 4 weeks showed the highest Olive tail moments at each benzene concentration examined (2.72-4.351). However this DNA damage was decreased after 6 weeks of exposure (1.74-2.09). DNA damages of B-lymphocytes did not show such differences with exposure time or benzene concentration (1.49-2.07) except at 200 ppm at 4 weeks. T-lymphocytes show significantly more damages than B-lymphocyte upon acute exposure to benzene.