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알파분광분석법에 의한 $^{237}Np$ 정량 및 사용후핵연료 시료에의 적용
조기수,김정석,한선호,박영재,김원호,Joe Kih-Soo,Kim Jung-Suck,Han Sun-Ho,Park Yeong-Jai,Kim Won-Ho 한국방사성폐기물학회 2006 방사성폐기물학회지 Vol.4 No.2
Alpha spectrometry was studied for the determination of $^{237}Np$ in spent nuclear fuel samples. The optimum condition for the electrodeposition of $^{237}Np$ was obtained as follows : for $1{\sim}1.5$ hour of deposition time, at the current intensity of $1.2{\sim}1.5$ A and at sodium sulfate electrolyte without organic additive. The deposition yield and its reproducibility on $^{237}Np$ was decreased as the amount of $^{237}Np$ decreased from 4.16 Bq down to 0.0264 Bq(1ng). The recovery yield of $^{237}Np$ determined by alpha spectrometry after separation in synthetic solution was $98.8{\pm}5.1%$(n=4). The contents of $^{237}Np$ in spent nuclear fuel samples were determined and the result showed an agreement within 10% of a difference between the measurement and the calculation.
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
"Elastic tie back"을 이용한 발치공간 폐쇄에 관한 임상적 고려
조기수,전윤식 대한치과교정학회 1993 대한치과교정학회지 Vol.23 No.2
Preadjusted appliance, following the original concept of the Andrews Straight-Wire appliance, became increasingly common in the 1980s. In six phases of treatment, anchorage control, leveling and aligning, overbite control, overjet reduction, space closure, and finishing are very effective with using the preadjusted appliances. Space closure is th phase of treatment in which the difference between standard edgewise and preadjusted mechanics is most noticeable. Orthodontists have been able to reduce the use of closing loops and, because of the level slot lineup, enjoy the advantages of sliding mechanics. In 1990, Dr. John C. Bennett and Richard P. McLaughlin introduced the new space closure system, namely, elastic "tiebacks'. They found an .019"×.025" working archwire most effective in an .022"slot system. Hooks of .024" stainless steel or .028" brass wire are soldered to the upper and lower archwires. The force required for space closure is delivered by elastic "tiebacks". An elastic module stretched by 23mm(to twice its normal length) usually delivers 0.51.5mm of space closure per month. Group movement and sliding mechanics are combined for gentle, controlled space closure, so that about 0.5mm of incisor retraction and 0.5mm of mesial molar movement can be seen each month. The tiebacks are replaced every four to six weeks. By using the elastic "tiebacks", the next two cases were treated during space closure. Even though we found some clinical problems of this mechanics, long treatment time, hard to control of vertical dimension and anchorage, the application method of this system is so simple that orthodontists can manage many patients during short chair time. But we must apply this mechanics after perfect understanding of the biomechanics in tooth movement.
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.