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한국 연안 퇴적물에서 ^137Cs, ^90Sr 및 Pu 동위원소의 분포
최석원,진현국,김철수,노정환,김창규,노병환 대한방사선 방어학회 2002 방사선방어학회지 Vol.27 No.2
한국 주변 연안 15개 정점의 퇴적물(0∼20 cm)에서 ^137Cs, ^90Sr, ^239+240Pu 의 농도와 농도비를 조사했다. ^137Cs, ^90Sr, ^238Pu 및^239+240Pu의 평균 방사능 농도는 각각 2.24±0.79 Bq·kg^-1-dry, 0.20±0.04 Bq·kg^-1-dry, 0.009±0.005 Bq·kg^-1-dry 및 0.27±0.17 Bq·kg^-1-dry이다. ^137Cs/^90Sr, ^239+240Pu/^137Cs 및 ^238Pu/229+240Pu의 평균 농도 비와 ^239Pu/240의 평균 원자 비는 각각 11.2±2.9, 0.123±0.053, 0.033±0.01 및 0.218±0.036이다. 퇴적물에서 핵종의 농도 범위와 핵종간의 농도 비는 그 동안 주변국가의 퇴적물에서 조사한 값과 비슷하였다. 퇴적물에서 ^137Cs과 ^239+240Pu의 상관계수는 0.80이다. ^137Cs과 SOM, ^239+240Pu과 점토 함량과의 상관계수는 각각 0.69, 0.67 이다. The concentrations and activity ratios of ^137Cs, ^90Sr, ^238Pu and ^239+240Pu in sediment(0∼20 cm) at 15 coastal stations of Korea were determined. The mean concentrations of ^137Cs, ^90Sr, ^238Pu and ^239+240Pu are 2.24±0.79 Bq·kg^-1-dry, 0.20±0.04 Bq·kg^-1-dry, 0.009±0.005 Bq·kg^-1-dry and 0.27±0.17 Bq·kg^-1-dry, respectively. The mean activity ratios of ^137Cs/^90Sr, ^239+240Pu/^137Cs and ^238Pu/^229+240Pu and atomic ratio of ^240Pu/^239Pu are 11.2±2.9, 0.123±0.053 and 0.033±0.017 and 0.218±0.036, respectively. The concentrations and activity ratios in sediment samples are similar to those reported from neighbouring country in the northern hemisphere. The correlation coefficient of ^137Cs and ^239+240Pu is 0.80. The correlation coefficient of ^137Cs and soil organic matter(SOM), and ^239+240Pu and clay content are 0.69 and 0.67, respectively.
모 컴퓨터 회사 근로자 건강증진 사업 전개를 위한 수요조사
임현우,안병용,최환석,박정일,김경수,이강숙,김정아,구정완 가톨릭대학산업의학쎈타 산업의학연구소 1997 韓國의 産業醫學 Vol.36 No.4
Before conducting the health promotion program, we surveyed the health risk appraisal(HRA) of 210 workers (186 men and 24 women) in a computer company, for the need assessment, selection of target population, priority setting, and as a standard for comparision after performing the program. The smokers were 115(88.6%), and drinkers (over 1 bottle of Soju per week) were 91(44.8%) in men. Entire women and 148(78.0%) men never or irregularly exercise. Type A personality were 73(39.2%) in men, 8(33.3%) in women, and 26(14.0%) of men and 6(25.0%) of women were high stress risk group. 53(25.2%) of men and 2(8.3%) of women were obese (BMI ≥25kg/m²), and workers who consumed exess of total calory compared with recommendation were 142(76.3%) in men and 18(75%) of women. By the health risk appraisal, it was suggested that smoking cessation program, drinking counselling, exercise prescription, stress management, and weight control program should be conducted effectively for the high risk group.
Choi, Yong Seok,Lee, Young-Su,Choi, Dong-Jun,Chae, Keun Hwa,Oh, Kyu Hwan,Cho, Young Whan American Chemical Society 2017 The Journal of Physical Chemistry Part C Vol.121 No.47
<P>A new solid-state Li ion conductor composed of LiBH<SUB>4</SUB> and Al<SUB>2</SUB>O<SUB>3</SUB> was synthesized by a simple ball-milling process. The element distribution map obtained by transmission electron microscopy demonstrates that the LiBH<SUB>4</SUB> and Al<SUB>2</SUB>O<SUB>3</SUB> are well mixed and form a large interface after ball-milling. The ionic conductivity of the mixture reaches as high as 2 × 10<SUP>–4</SUP> S cm<SUP>–1</SUP> at room temperature when the volume fraction of Al<SUB>2</SUB>O<SUB>3</SUB> is approximately 44%. The ionic conductivity of the interface between LiBH<SUB>4</SUB> and Al<SUB>2</SUB>O<SUB>3</SUB> was extracted by using a continuum percolation model, which turns out to be about 10<SUP>–3</SUP> S cm<SUP>–1</SUP> at room temperature, being 10<SUP>5</SUP> times higher than that of pure LiBH<SUB>4</SUB>. This remarkable rise in conductivity is accompanied by the lowered activation energy for the Li ion conduction in the mixture, indicating that the interface layer facilitates Li ion conduction. Near-edge X-ray absorption fine structure analysis reveals the presence of B–O bondings in the mixture, which was not detected by X-ray diffraction. This disruption of the chemical bondings at the interface may allow an increase in carrier concentration and/or mobility thereby resulting in the pronounced enhancement in conductivity. This result provides a guideline for designing fast Li ion conductor through interface engineering.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2017/jpccck.2017.121.issue-47/acs.jpcc.7b08862/production/images/medium/jp-2017-08862v_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp7b08862'>ACS Electronic Supporting Info</A></P>
초정밀 위치 제어를 이한 이중 서보 시스템의 보상기 설계
최현석(Hyeun Seok Choi),송치우(Chi Woo Song),한창수(Chang Soo Han),최태훈(Tae Hoon Choi),이낙규(Nak Kyu Lee),나경환(Kyung Whan Na) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
The high precision positioning mechanism is used in various industrial fields. It is used in semiconductor<br/> manufacturing line, test instrument, Bioengineering, and MEMS and so on. This paper presents a positioning<br/> mechanism with dual servo system. Dual servo system consists of a coarse stage and a fine motion stage. The<br/> course stage is driven by VCM and the actuator of fine stage is the PZT. The purposes of dual servo system<br/> are stability, higher bandwidth, and robustness. Lead compensator is applied to this control system, and is<br/> designed by PQ method. Designed compensator can improve property of positioning mechanism.
최남용(Nam Yong Choi),정형국(Hyung Kook Cheong),고해석(Hae Seok Koh),한창환(Chang Whan Han),박성진(Sung Jin Park),한석구(Suk Ku Han),최우혁(Woo Hyuk Choi),송현석(Hyun Seok Song) 대한정형외과학회 2006 대한정형외과학회지 Vol.41 No.6
목적: 슬관절에 발생한 색소 융모 결절성 활액막염에서 후방-후방 도달법을 이용한 관절경적 치료 및 결과를 분석하여 그 유용성을 알아보고자 하였다. 대상 및 방법: 1997년 1월부터 2004년 5월까지 관절경적 활막절제술을 시행하여 병리조직 검사상 색소 융모 결절성 활액막염으로 확진된 21예를 대상으로 하였다. 술 후 추시 기간은 평균 35개월이었다. 관절경 수술 소견 및 MRI 검사상, 국소형이 6예, 미만형이 15예였다. 모든 예에서 슬관절의 전방 및 후방-후방 도달법을 이용하여 후방 구획의 관절경하 검사 및 활막절제술을 시행하였다. 수술 전후의 임상적 결과는 Lysholm score 및 관절운동 범위, 슬관절의 동통을 Visual Analogue Scale (최저 0-최고 10)로 측정하여 비교하였다. 결과: 미만형 3예(14%)에서 재발하여 2차 관절경적 활막절제술을 시행하였으며, 이 중 1예에서 다시 재발되어 방사선 치료를 시행하였다. Lysholm 점수는 술전 평균 62.5점에서 술 후 평균 87.3점으로 호전되었으며, 슬관절 동통은 VAS 5.9점에서 1.8점으로 향상되었다. 슬관절 운동 범위는 방사선 치료를 시행한 1예를 포함한 3예에서 경도의 슬관절 운동 제한이 있었으나, 나머지 18예에서는 완전 신전 및 굴곡이 가능하였다. 결론: 색소 융모 결절성 활액막염의 치료에 관절경적 활막절제술이 우수한 결과를 보였으며, 후방-후방 도달법을 이용하면 후외방 및 후내방 병소를 제거할 수 있어, 좋은 결과를 얻을 수 있을 것으로 생각한다. Purpose : To evaluate the efficacy of arthroscopic synovectomy through the direct posteriorposterior approach in pigmented villonodular synovitis (PVNS) of the knee. Materials and Methods : Between January 1997 and May 2004, twenty-one patients underwent an arthroscopic synovectomy for PVNS of knee. The mean follow-up period was 35 months. The arthroscopic and MRI findings revealed the localized form of PVNS in six patients and the diffuse form in fifteen patients. All patients underwent an arthroscopic examination and synovectomy through the direct posterior-posterior approach. The clinical results were evaluated by the range of motion, Lysholm knee score, and the knee pain score using the visual analogue scale (minimum 0-maximum 10). Results : Among the fifteen cases with the diffuse form, three cases (14%) recurred and had secondary arthroscopic total synovectomy. One cases recurred again. Therefore, radiation therapy was performed. The Lysholm knee score improved from 62.5 to 87.3, and the VAS score improved from 5.9 to 1.8. Three patients had a mild limitation in knee motion. However, the others had full range of motion of the knee at the last follow-up. Conclusion : Arthroscopic synovectomy through the direct posterior-posterior approach could be a useful method for the treatment of PVNS of the knee, and can be used as an effective therapeutic tool particularly in posteromedial or posterolateral lesions.