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조기수,한선호,송병철,이창헌,하영경,송규석 한국원자력학회 2013 Nuclear Engineering and Technology Vol.45 No.3
A determination method for 237Np in spent nuclear fuel samples was developed using an isotope dilution method with 239Np as a spike. In this method, inductively coupled plasma mass spectrometry (ICP-MS) was taken for the 237Np instead of the previously used alpha spectrometry. 237Np and 239Np were measured by ICP-MS and gamma spectrometry, respectively. The recovery yield of 237Np in synthetic samples was 95.9±9.7% (1S, n=4). The 237Np contents in the spent fuel samples were 0.15,0.25, and 1.06 μg/mgU and these values were compared with those from ORIGEN-2 code. A fairly good agreement between the measurements (m) and calculations (c) was obtained, giving ratios (m/c) of 0.93, 1.12 and 1.25 for the three PWR spent fuel samples with burnups of 16.7, 19.0, and 55.9 GWd/MtU, respectively.
조기수,전윤식 의치학사 1991 치과임상 Vol.11 No.11
하악 전치결손이 동반된 교정치료 계획수립시 하악 전치발치가 치료기간 단축뿐만 아니라 훌륭한 치료 결과를 얻는 경우도 있다. 그러나 임상적으로 고려되어야 할 사항들은 다음과 같다. 1. 정중선의 변위와 불일치 2. 부적절한 overbite과 overjet 3. 기능 교합(functional occlusion) 4. 심미성(esthetics) 5. 하악 전치부의 stability Sometimes orthodontists find unusual malocclusions. One example is one incisor missing,upper or lower , due to congenital or pathologic conditions. In those cases we cannot establish the treatment plan easily because tooth number and size discrepancies interfere with excellent overbite, overjet and interdigitation. Therefore there are _many.options about unusual extraction, one side or both side premolar extraction or, upper or lower incisor extraction and so forth. If we choose one of the options we have to consider many `problems. Such clinical considerations are as follows ; 1. Denture midline shift and discrepancy 2. Inadequate overbite and overjet 3. Inadequate mutually protected occlusion 4. Esthetic problem . 5. Instability of lower incisor contact