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Ni 촉매층의 두께가 탄소나노튜브의 성장 형태에 미치는 영향
김정태,박용섭,김형진,최은창,홍병유,Kim, Jung-Tae,Park, Yong-Seob,Kim, Hyung-Jin,Choi, Eun-Chang,Hong, Byung-You 한국진공학회 2007 Applied Science and Convergence Technology Vol.16 No.2
본 연구에서는 탄소나노튜브의 성장특성을 결정짓는 여러 요소 중 한가지인 촉매층 두께의 변화에 따라서 형성되어지는 탄소 나노튜브의 형태 변화를 관찰하였다. Ni 촉매층은 마그네트론 스퍼터링법을 이용하여 증착하였으며, Ni 촉매층의 두께는 $20{\sim}80\;nm$의 범위에서 설정하였다. 두께에 따른 Ni 촉매층 기판을 hot-filament 플라즈마 화학기상 증착(HF-PECVD) 장치를 이용하여 탄소나노튜브를 합성하였으며, 성장되어진 탄소나노튜브의 성분분석은 에너지 분산형 X-선 측정기(EDS)를 통해 분석하였고, 고배율 투과전자현미경(HRTEM) 분석과 전계방사 주사전자현미경(FESEM) 분석을 통해 성장된 탄소나노튜브 성장 형태를 관찰하였다. 그 결과로써, 고배율 투과전자현미경(TEM) 분석을 통해서는 탄소나노튜브는 내부가 비어있으며, 다중벽으로 구성되어 있는 것을 관찰하였고, 탄소나노튜브 상부에 니켈 금속이 포함된 것을 확인하였다. 이것은 분산형 X-선 측정을 통해 탄소나노튜브의 구성성분이 접착층인 Ti, 촉매층인 Ni 그리고 탄소(C)로 이루어졌음을 다시한번 확인하였으며. 성장형태에서도 알 수 있듯이 탄소나노튜브 성장 전에 행해여지는 전처리는 촉매층의 입자를 변화시키고 변화된 촉매층의 표면은 다른 형태의 탄소나노튜브를 성장시킴을 알 수 있었다. 결과적으로, 40 mn의 촉매층을 지니는 기판에서 가장 좋은 형태를 나타내는 탄소 탄소나노튜브가 성장되었음을 알 수 있다. In this study, we observed the shapes of CNTs formed with the thinckness of catalyst. Catalyst layer was grown by magnetron sputtering method and the thickness of Ni catalyst is the range from 20 to 80 nm. Also, the synthesis of CNT with Ni catalyst thickness was grown by hot-filament PECVD method. And, we investigated the composition of CNTs by using EDS measurement, also observed the shapes of CNTs by using HRTEM and FESEM measurements. In the result, through the TEM analysis, we observed the empty inside of CNTs and the multiwall CNTs, also confirmed the tip of CNT containing Ni. The composition of CNTs are consisted of an element of C, Ti, and Ni. As you shown the growth shapes of CNTs, the pretreatment of the catalyst before te growth of CNTs changed the particle size of the catalysts and grown the CNTs of the different shapes. Consequently, the best vertically alined and well-arranged CNTs exhibited from the substrate deposited at the catalyst thickness of 40 nm.
최은나,김정태,김유리아,유병원,최덕영,최재영,설준희,이승규,김동수,박영환,Choi, Eun Na,Kim, Jeoung Tae,Kim, Yuria,Yoo, Byung Won,Choi, Deok Young,Choi, Jae Young,Sul, Jun Hee,Lee, Sung Kye,Kim, Dong Soo,Park, Young Hwan The Korean Pediatric Society 2005 Clinical and Experimental Pediatrics (CEP) Vol.48 No.3
가와사끼병은 주로 소아연령에서 발생하는 급성 열성 혈관염으로 관상동맥의 확장이 치명적 합병증으로 나타날 수 있다. 저자들은 3개월된 영아에서 반복적인 정맥용 면역글로불린, 스테로이드, 경구용 methotrexate의 치료에도 불구하고 진행되는 관상동맥 병변으로 다발성 거대 관상류, 협착 및 관상동맥 내 혈전을 보이며 심전도상 심근 허혈 소견과 함께 심장 자기공명영상에서 좌심실의 확장과 전벽 및 중격의 심한 운동저하를 나타낸 증례를 보고한다. 환아는 보존적 요법에 반응하지 않는 관상동맥병변으로 내원 88일째 수술적으로 우측 거대관상동맥류를 절개하고 Gore-tex tube를 삽입하여 각각의 측부순환과 연결하였으며, 좌측 관상동맥 협착부위는 세로로 절개한 후 심장막 반(pericardial patch)을 삽입, 확장하였으나, 수술 후 심폐부전으로 사망하였다. Kawasaki disease is an acute systemic vasculitis of unknown origin. Giant coronary aneurysm is one of the most serious complications, although peripheral artery vasculitis can produce life-threatening events. Myocardial ischemia and infarction can be caused by coronary artery stenosis, aneurysm, and stagnation of blood flow in coronary arteries which triggers thromboembolism. Atypical presentation in young infants often interferes with prompt diagnosis and timely treatment, resulting in poor outcomes. We describe a 3-month-old infant with multiple giant coronary aneurysms with flow stagnation, stenosis and large mural thrombus due to Kawasaki disease. He presented with a prolonged course of severe coronary involvement in spite of all measures to reduce coronary complications. Finally, surgical intervention was tried because of the worsening coronary artery abnormalities. The patient died of acute cardiorespiratory failure shortly after weaning from cardiopulmonary bypass.
임산부 및 제대 혈중 그렐린 농도와 신생아 출생 체중과의 연관성
김정태 ( Jeong Tae Kim ),주종길 ( Jong Kil Joo ),이동형 ( Dong Hyung Lee ),김기형 ( Ki Hyung Kim ),나용진 ( Yong Jin Na ),최욱환 ( Ook Hwan Choi ) 대한산부인과학회 2009 Obstetrics & Gynecology Science Vol.52 No.2
Objective: Ghrelin is a newly isolated peptide from the stomach. Subsequent studies revealed that ghrelin is expressed in human placenta. Circulating ghrelin levels reflect acute and chronic energy balance in humans. However, it is not proven whether ghrelin plays a role during pregnancy. The purpose of this study was to compare relationship between ghrelin levels of maternal serum, umbilical vein and birth weight. Methods: We measured maternal ghrelin levels (N=41) in each trimester and postpartum whose fetus were appropriate-for-gestational age. Also we checked cord blood ghrelin levels at delivery in appropriate-for-gestational age group (N=20) and small-for-gestational age group (N=20). Results: Ghrelin was detected in all samples from maternal and cord blood. Maternal serum ghrelin levels showed a peak in the 2nd trimester (35.7±12.7 pg/mL) and decreased in the late 3rd trimester (26.5±10.3 pg/mL). An increase was observed again in postpartum, which was measured at one day after delivery. There was no significant correlation between maternal serum ghrelin level and birth weight (P>0.05), but there was statistically significant correlation between cord blood ghrelin level and birth weight (r=-0.411, P<0.05). Conclusion: Maternal serum ghrelin levels showed a peak around mid-gestation during pregnancy and then, decreased in the 3rd trimester, the time of increased maternal body weight. There was no association between maternal serum ghrelin level and birth weight. But small-for-gestational age neonates present with higher umbilical cord ghrelin level than that of appropriate-for-gestational age neonates. It is conceivable that ghrelin may play a physiologic role in fetal adaptation to intrauterine malnutritional state.
여러가지 방법을 이용한 전두부 함몰 변형에 대한 교정치험례
김정태 ( Jeong Tae Kim ),최희윤 ( Hee Youn Choi ) 대한외상학회 1990 大韓外傷學會誌 Vol.3 No.1
Since the frontal area is the most cosmetically obvious, a slight distortion of symmetry or deperssion renders gross changes in appearance and is a significant handicap for the pat-ients. Frontal depressions or bons defects afther trauma or operation are not only a cos-metically significance, but also aprotective role for brain. We have experienced 5cases of the reconstructions for frontal depressions with the ope-rations using autogenous bone grafts, dermofat grafts, methyl methacryate contouring or parascapular free flap.The results were satisfactory escept one, absorption of grafted bon-e. We also preferrde methyl methacrylate in the cases of no cranial bone defect or large cranial bone defect and autogenous bone grafts in small cranial bone defects.
솔비톨 및 Salicylic Acid 처리가 토마토 과실의 품질 및 기능성 물질 함량에 미치는 영향
김정태(Jung-Tae Kim),김윤하(Yoon-Ha Kim),최진석(Jin-Suck Choi),이인중(In-Jung Lee) 한국원예학회 2014 원예과학기술지 Vol.32 No.6
In this study, we aimed to understand the effect of sorbitol and salicylic acid (SA) on quality and functional food contents of tomato. Sole or combined application of sorbitol and SA in different concentrations (0.5 mM and 1.0 mM) greatly improved the characteristics of tomato, such as red color tone, soluble solid content, hardness and weight as well as increasing the functional food contents such as of lycopene, anthocyanins and vitamins in comparison with the control. The cyanidin content increased approximately 52-61% and delphinidin contents also increased 20-24% and 39-41% in tomato plants treated with SA alone and sorbitol with SA, respectively. Furthermore, the sole or combined application of sorbitol and SA also increased the vitamin B1 and C contents. In particular, vitamin C content was increased 1.2-fold by treatment with sorbitol alone and was increased 2-fold by SA treatment compared to the control. In the sorbitol with SA treatments, vitamin C content was approximately 4-fold increased relative to control plants.