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어린이 모야모야병에서 휴식 / 아세타졸아미드 Tc-99m-HMPAO SPECT 를 이용한 수술결과 평가
이동수,현인영,왕규창,조병규,정준기,이명철 ( D. S. Lee,I. Y. Hyun,K. C. Wang,B. K. Cho,J. K. Chung,M. C. Lee ) 대한핵의학회 1998 핵의학 분자영상 Vol.32 No.4
Purpose: This study was performed to evaluate the outcome of encephalo-duro-arterio- synangiosis (EDAS) surgery with rest/acetazolamide Tc-99m HMPAO SPECT in moyamoya disease. Materials and Methods: Rest/acetazolamide subtraction SPECT with consecutive acquisition were done before and 2 months after 21 EDAS surgeries in 18 patients. Perfusion decrease was graded visually for 14 areas of each hemisphere as 0 (normal) to 3 (defectj using 4 point scoring system. Postoperative rest perfusion or perfusion reserve was compared with preoperative ones. Results: Among 294 areas of 21 hemispheres, rest perfusion abnormality was found in 97 areas of 15 hemispheres. Decrease of perfusion reserve was found in 146 areas of 18 hemispheres. Six hemispheres having normal rest perfusion and 12 of 15 hemispheres having rest perfusion abnormality showed reserve decrease. Three having rest perfusion defect did not change after acetazolamide in preoperative SPECT. After operation, 16 patients (89%) demonstrated clinical improvement. Fifteen among 18 hemispheres (83%) with decreased reserve improved. Rest perfusion abnormality improved in 6 among the 1.' hemispheres (40%). The areas having rest perfusion and/or reserve decrease improved in 8 : among 146 areas (60%). Decrease of reserve improved in 85% (68/80). However, areas without reserve decrease also improved in 29%(19/#66). The better was peoperative resi perfusion in involved areas or the more decreased vascular reserve, the rnore improved perfusion and reserve after operation. Conclusion: We conclude that assessment of perfusion and perfusion reserve using rest/acetazolamide brain perfusion SPECT predict the surgical outcome in patients with moyamoya disease. (Korean J Nucl Med 1998;32:314-24)
중탄소 고망간강의 합금원소와 열처리 조건이 미세조직과 기계적 특성에 미치는 영향
이동수 ( D. S. Lee ),박현균 ( H. G. Park ) 한국열처리공학회 2010 熱處理工學會誌 Vol.23 No.6
Mechanical properties and microstructures of medium carbon high manganese steels were investigated in terms of alloying elements such as Mn, C contents, and heat treatment condition. Austenite volume fraction was increased with increasing Mn content, leading to hardness decrease in the range of Mn content of above 10% after quenching and tempering. Such results are also supported by microstructural analysis and X-ray diffraction in that the increase in mangaese content results in the increase in austenite fraction. Studies on tempering condition indicated that not only hardness and tensile strength but also charpy impact values were reduced as tempering temperature were raised in the range of 250℃ to 600℃. It was also observed that fracture mode was changed from dimple to intergranular fracture. Such results are thought to be due to very fine carbide precipitation or impurity segreagation at grain boundaries as tempering temperature goes up. Heat treatment of Fe-5Mn-2Si-1Al-0.4C can be optimized by austenitizing at 850℃, air cooling and tempering at 250℃, resulting in 1950 MPa in Tensile strength, 17% in elongation and 23.3 J/cm2 in charpy impact energy with high work hardening characteristics.
이종진,허준영,강세경,이준기,이정찬,이동수,Lee, J.J.,Huh, J.Y.,Kang, S.K.,Lee, J.K.,Lee, J.C.,Lee, D.S. 한국전자통신연구원 2015 전자통신동향분석 Vol.30 No.1
스마트폰의 보급에 따른 대용량 멀디미디어 서비스의 폭발적인 수요 증가에 따라데이터센터의 100Gb/s 광트랜시버에 대한 수요는 2017년을 기점으로 10Gb/s를 추월하여 2018년 데이터콤 전체 시장의 50% 이상을 차지할 전망이다. 한편, 데이터센터의 소비전력 및 시스템 집적도 증가를 위해 광트랜시버의 Form-factor는 CFP(40G/100G Form-factor Pluggable)에서 QSFP28($4{\times}28G$ Quad Small Form-factor Pluggable)로 약 1/14배 소형화될 전망이며, 이에 따른 광트랜시버 구성 부품의 집적도는 높아지고 소비전력은 현재 대비 1/9로 낮아져야 한다. 본고에서는 소형화 및 저전력화를 위한 광트랜시버의 표준화 및 기술동향과 국내외 시장동향에 대해 기술한다.
휴식 / 부하 심근 Rubidium - 82 양전자단층촬영과 부하 / 휴식 심근 Tc - 99m - MIBI 단일광자단층촬영의 비교
이동수(D . S . Lee),정준기(J . K . Chung),이명철(M . C . Lee),고창순(C . S . Koh),이경한(K . H . Lee),강건욱(K . W . Kang),정재민(J . M . Jeong),곽철은(C . Kwark),서정돈(J . D . Seo) 대한핵의학회 1995 핵의학 분자영상 Vol.29 No.1
N/A We compared stress/rest myocardial Tc-99m-MIBI tomographic image findings with rest/stress rubidium-82 tomographic images. In 23 patients with coronary artery disease (12 of them received bypass grafts before) and 6 normal subjects, rest rubidium PET study was performed, rubidium-82 and Tc-99m-MrBI were injected simultaneously to each patient after dipyridamole stress for rubidium PET and MIBI SPECT; and rest MIBI SPECT was performed 4 hours thereafter. We scored segmental decrease of rubidium, or MIBI uptakes into 5 grades for 29 segments from 3 short-axis, vertical and horizontal slices. Scores were summed for each major arterial territory. When more score than two grade-2's or one grade-3 was considered as the cue for significant stenosis for major arterial territories, 67% of 46 stenosed arteries were found with MIBI studies and 78% of them by rubidium studies. Fourteen among 28 grafted arterial territories of 12 post-CABG patients were found normal with both rubidium and MIBI. Segmental scores were concordant between rubidium and MIBI in 72% of 709-stress segments and in 80% of 825 rest segments. Stress rubidium segmental scores were less than stress MIBI scores in 9%, so were rest rubidium scores. Stress rubidium scores were more than stress MIBI scores in 20% of segments, and rest rubidium segmental scores were more than rest MIBI scores in 11%. Rank correlations (Spearman's rho's more than 0.7(stress) and 0.5(rest), slopes (MIBI/rubidium) around 0.7(stress) and 0.9(rest) suggested deeper and wider defects in stress with rubidium. Slope over 1 (MIBI/rubidium) with LAD segemental scores at rest and 7 territories which had much larger score with MIBI revealed exaggeration of rest defects with rest MIBI in same-day stress/rest study. Difference scores (stress-rest for each territory) suggesting ischemia were larger with rubidium (slope of MIBI/rubidium around 0.45). As has been implied by animal or separate-day- human studies, these segmental analyses with simultaneous examination in patients told that rubi
게이트 99mTc - MIBI 심근 SPECT의 심근 분절 운동 평가능력
이동수(D . S . Lee),정준기(J . K . Chung),이명철(M . C . Lee),김선욱(S . W . Kim),김상현(S . H . Kim),현인영(I . Y . Hyun),이명묵(M . M . Lee),고창순(C . S. Koh) 대한핵의학회 1995 핵의학 분자영상 Vol.29 No.4
N/A Information about regional wall motion obtained with gated Tc-99m-MIBI SPECT was compared in 23 subjects(4 normals) to echocardiography or contrast left ventriculography. Gated SPECT study using 20-30 mCi Tc-99m-MIBI were aquired for 8 frames/RR interval (aqusition time=40min.) and processed with Cine Mode computer protocol. Regional wall motion was assessed by visual analysis. The concordance with echocardiography was 88% and with contrast ventriculography was 78%. We conclude that gated Tc-99m-MIBI SPECT was effective in assessing the regional wall motion with the information of regional perfusion in one study.
뇌동맥류파열에 의한 지주막하출혈 환자에서 99mTc - HMPAO SPECT 검사의 유용성
이동수(D . S . Lee),정준기(J . K . Chung),이명철(M . C . Lee),고창순(C . S . Koh),최창운(C . W . Choi),이경한(K . H . Lee),김종호(J . H . Kim),곽철은(C . E . Kwark),한대희(D . H . Han) 대한핵의학회 1993 핵의학 분자영상 Vol.27 No.2
N/A We evaluated the usefulness of Tc-99m-HMPAO SPECT in 21 Patients with subarachnoid hemorrhage due to ruptured intracranial aneurysm and in 3 patients with unruptured intracranial aneurysm. SPECT study could detect the bilaterally hypoperfused cases in 10 patients(48%), but CT/MRI showed the bilateral abnormalities in only 3 patients(14%). The number of abnormal lesions were 56 in SPECT and 25 in CT/MRI. The lesions found in SPECT were well correlated with the neurological signs of the patients such as aphasia or hemiplegia. SPECT study during Matas test was helpful in evaluating the risk for carotid artery occlusion therapy. We thought that Tc-99m-HMPAO brain SPECT is helpful in evaluating the functional changes in patients with subarachnoid hemorrhage.