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저농도 만성적인 유기용제 폭로시 자각증상과 Flicker 검사치와의 연관성
손명호,손석준,최진수,Son, Myung-Ho,Sohn, Seok-Joon,Choi, Jin-Su 대한예방의학회 1994 예방의학회지 Vol.27 No.3
This study was conducted to examine the effect of chronic low dose organic solvent exposures in the industries towards then neurobehavioral functions of workers. Subjective symptoms on neurobehavioral function as well as a visual reaction time test (Flicker test) were administered to 94 exposed and 162 unexposed workers in a oil refinery and some other auto-repair shops. The results obtained were as follows : 1. Symptom complaints were higher and Flicker test values were lower in exposed workers than in unexposed workers. 2. Flicker valus were Inversely correlated with urinary Hippuric acid concentration in exposed workers(r=-0.26, p<0.05). 3. Flicker valus were inversely co..elated with Subjective symptom score(r=-0.15, p<0.05). Low Flicker value were also related with some subjetive symptoms such as 'Dimmed vision', 'Nightmare', 'Weakness on extrimity' in workers as a whole. While symptoms of 'Dimmed vision ', 'Nightmare' only observed among exposed workers.
일부 한국인 Debrisoquine 대사분포에 대한 연구
이명학,문화영,손명호,손석준,최진수,Lee, Myung-Hak,Moon, Hwa-Young,Son, Myung-Ho,Sohn, Seok-Joon,Choi, Jin-Su 대한예방의학회 1994 Journal of Preventive Medicine and Public Health Vol.27 No.3
The genetically determined ability to metabolize debrisoquine (DBR) is related to risk of lung cancer and DBR hydroxylation exhibits wide inter-individual variation. In this study, 100 korean adults were tested for their ability to metabolize DBR. The DBR metabolic phenotype were determined by metabolic ratio (MR, DBR / 4-HDBR) which is the percent dose excreted as unchanged DBR divided by the percent dose excreted as 4-hydroxyebrisoquine(4-HDBR) in a aliquot of an eight hour urine sample, after 10mg DBR test dose administration. Analysis was performed on a capillary gas chromatograph fitted with electron capture detector. The results were as follows; 1 Geometric mean of DBR MR was 0.32 in male,0.27 in female,0.30 in total and the distribution of log (MR) was seemed to follow normal distribution. 2. Metabolic ratio of DBR was higher in non-smoker and non-drinker than in smoker and drinker without any statistically significant difference. 3. None of personal factors was significantly related to DBR MR except age. 4. The DBR metabolic phenotype was extensive metabolizer(EM) 93, intermediate metabolizer(IM) 7 by traditional method and EM 98, IM 3 by Caporaso's method. The poor metabolizer (PM) phenotype was not found by either method. 5. Maximal expected PM phenotype was 0.36% by traditional method and 0.04% by Caporaso's method.
FLO-2D에서 댐붕괴 모형 매개변수의 침수 범위 민감도 분석
이길하 ( Khil Ha Lee ),손명호 ( Myung Ho Son ),김성욱 ( Sung Wook Kim ),유순영 ( Soon Young Yu ),조진우 ( Jin Woo Cho ),김진만 ( Jin Man Kim ),정규정 ( Jung Kyu Jung ) 대한지질공학회 2014 지질공학 Vol.24 No.1
댐붕괴로 인하여 빚어지는 홍수위험지도 작성에서 물리적 현상을 재현해내기 위하여 수치모형이 사용되는 것이 일반적이다. 이때 모형의 정확도는 저수지의 수량과 댐붕괴 형성 및 진행을 포함한 모형의 물리적 구조, 입력인자 및 매개변수의 신뢰도에 의하여 결정되기 마련이다. 특히 입력인자 및 매개변수는 모형을 이용하기 이전에 미리 결정하여 입력하게 되며 사용자의 판단과 주관에 의지하므로 주의가 요구된다. 이 연구에서는 댐붕괴 모형을 FLO-2D와 연동하여 홍수침수모의를 실시할 때에 댐붕괴 모형에서 세 개의 매개변수(붕괴각도 θ, 저수지 형상계수 P, 붕괴율 k가 FLO-2D의 침수모의(침수범위, 침수깊이 등)에 어떻게 영향을 미치는 가를 살펴보았다. 붕괴각도 θ는 FLO-2D의 침수모의에 있어 낮은 영향을 미치나 저수지 형상계수 P와 붕괴율 k는 중대한 영향을 미치는 것으로 나타났다. 이 연구는 향후 댐붕괴에의한 홍수 위험의 피해를 저감하는데 기여할 것이다. Numerical modeling is commonly used to reproduce the physical phenomena of dam-break and to compile resulting flood hazard maps. The accuracy of a dam-break model depends on the physical structure that describes the volume of storage, breach formation and progress, input variables, and model parameters. Model input and parameters are subjective in that they are prescribed; hence, caution is needed when interpreting the results. This study focuses on three parameters (breach degree θ, shape factor P, and collapse rate k) used when the dam-break model is coupled with FLO-2D (a two-dimensional flood simulation model) to estimate flood coverage and depth etc. The results show that the simulation is sensitive to the shape factor P and the collapse rate k but not to the breach degree θ. This study will contribute to reducing flood damage from dam-break disasters in the future.
손명호,장영일 대한치과교정학회 2004 대한치과교정학회지 Vol.34 No.5
본 연구의 목적은 Ⅲ급 부정교합의 치료 시에 하악 제3대구치의 존재가 하악 치열의 원심 치군 이동(distal en masse movement) 및 치료 기간에 미치는 영향을 평가하기 위한 것이다. 서울대학교병원 교정과에 내원하여 Ⅲ급 부정교합으로 진단을 받고, 이에 대한 교정 치료를 받은 36명(남자 9명, 여자 27명)을 선택하였다. 모든 환자는 제3대구치 이외의 다른 치아는 발거하지 않았다. 이를 하악 제 3대구치의 발거 시기에 따라 세 군으로 분류하였는데, 제1군은 하악 제 3대구치를 발거하지 않고 MEAW를 사용하여 치료를 종료한 12명이며, 제 2군은 MEAW 적용 후에 하악 제 3대구치를 발거한 8명, 제 3군은 MEAW를 적용하기 전에 하악 제3대구치를 발거한 16명이다. 각 환자들에 대하여. 전체 치료 기간 및 MEAW 적용 기간을 구하였으며, 치료 전 후의 측모 두부 계측 방사선 사진을 분석하였다. 각 군에 대한 치료 기간 및 치료 전 후의 변화를 ANOVA를 이용하여 통계 처리 하였으며. 다음과 같은 결론을 얻었다. 전체 치료 기간은 각 군 사에 유의성 있는 차이가 없었으나, MEAW를 적용한 기간은 제 2군(MEAW 적용 후에 하악 제3대구치를 발거한 군)에서 가장 길었다. 제3군(MEAW를 적용하기 전에 하악 제3대구치를 발거한 군)에서, 치료 후에 형성된 overjet이 가장 컸다. 제3군(MEAW를 적용하기 전에 하악 제3대구치를 발거한 군)의 경우 치료 후에 IMPA가 감소화였으나, 제1군(하악 제3대구치를 발거하지 않고 치료를 종료한 군)과 제 2군(MEAW 적용 후에 하악 제3대구치를 발거한 군)에서는 IMPA가 증가하였다. 제2대구치의 원심 치체 이동량은 세 군 사이에 유의성 있는 차이가 없었으나, 원심 경사 이동량은 세 군 사이에 통계적으로 유의한 차이가 있었으며, 제 2군, 제 3군, 제 1군의 순이었다. 따라서, MEAW를 적용하기 이전에 하악 제3대구치를 발거하는 것이 Ⅲ급 부정교합의 교정적 치료에 더 좋을 것으로 판단된다. 제 2군의 경우 하악골의 전방 회전 결과, 하악 평면각의 감소가 있었으며. 이러한 골격 변화가 치료 기간의 연장에 영향을 주었다고 판단된다. The purpose of this study was to evaluate the effect of the lower third molar on treatment time and distal en masse movement of the lower dentition in Class Ⅲmalocclusions. Thirty subjects (9 males and 27 females) were selected, all of whom were diagnosed as Class Ⅲ malocclusion and treated by fixed appliances without premolar and/or molar extraction. They were divided into three groups. Group 1 consisted of 12 subjects, whose lower third molars were not extracted during the whole orthodontic treatment. Group 2 consisted of 8 subjects, whose lower third molars were extracted after MEAW application and before removal of the orthodontic appliances. Group 3 consisted of 16 subjects, whose lower third molars were extracted before MEAW application. For each subject, overall treatment time and duration of MEAW application were determined. In addition, pre-treatment and post- treatment lateral cephalometric radiographs were analyzed. All data were processed statistically with ANOVA, and the conclusions were as follows: There was no significant difference among the groups in overall treatment time. However, duration of MEAW application was longer in Group 2 than in Group 1 or Group 3. The overjet that was established after orthodontic treatment was largest in Group 3, in which the lower third molars were extracted before MEAW application. After orthodontic treatment, IMPA decreased in Group 3, but increased in Group 1 and Group 2. There was no significant difference among the three groups in the translation of lower second molars. However, the tipping movement of lower second molars was significantly different, highest In Group 2 and lowest in Group 1. Therefore, it is thought to be better for the orthodontic treatment of Class Ⅲ malocclusions to extract the lower third molars before MEAW application. In Group 2, the mandibular plane angle was decreased as a result of forward rotation of the mandible. This skeletal change was thought to bring about the difficulty of treatment.