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정중기 대한전기학회 2002 전기의 세계 Vol.51 No.9
최근 일본에서 발표된 혼다의 ASIMO, 소니의 AIBO, SDR-3X, SDR-4X 등의 로봇에 힘입어 전 세계적으로 퍼스널 로봇의 연구개발이 활성화되고 있으며, 국내에서도 소규모 벤처 로봇 업체를 중심으로 이전의 산업용 로봇으로부터 퍼스널 로봇으로 개발방향을 선회하고 있는 실정이다. 이미 인터넷이나 신문매체를 통하여 접할 수 있는 구미의 실용적인 서비스 로봇기술과 함께, 마치 정말로 살아서 움직이는 듯한 동작을 표현하는 일본의 로봇기술은 개발하는 사람으로서도 절로 감탄을 자아내게 만든다. 이러한 로봇 및 제어기술에 대한 국내의 로봇 벤처기업의 반응은 이를 구현할 수 있는 일본의 산업인프라가 부럽다는 것이다. 즉 모터, 센서, 전지 등의 핵심부품만 받쳐준다면 해볼 만 하다는 것이다. 여기에는 여러 가지 메커니즘 및 핵심부품이 있으나 이 글에서는 산업자원부의 자금으로 수행하고 있는 퍼스널 로봇용 기반기술 과제를 중심으로 메커니즘 부분에는 모듈형 로봇 팔과 이동 메커니즘, 그리고 핵심부품부분에는 구동부품과 스테레오 시각센서에 관하여 소개하고자 한다.
정중기,권유진,이태승,박형섭,유영선,최금희,한소리,황지혜,이지열 대한혈관외과학회 2011 Vascular Specialist International Vol.27 No.3
Purpose: Lymphedema is a disease with a poorly understood pathogenesis and without definite ways of treatment, yet it can lead to serious complications. The purpose of this study was to establish a new lymphedema mouse model and to evaluate its usefulness for future studies. Methods: A lymphedema model was created by interrupting flow from the superficial lymphatic system (skin and subcutaneous tissue removal, electrocautery) and the deep lymphatic system (hindlimb muscle resection, dye injection, and inguinal lymph node dissection). The lymphedema group (n=10) was compared to a control group (n=10) by assessing the differences in hindlimb edema, through the use of a water displacement volumetry method. In addition, lymphoscintigraphy, immunohistochemistry, and reverse transcription-polymerase chain reaction (RT-PCR) were performed and compared between the 2 groups. Results: Volumetric analysis showed that the lymphedema group had a 2-fold increase in swelling compared to the control group at study day 3; this gradually decreased to normal levels after 8 weeks. Staining showed an increase in fibrosis in the lymphedema group, as well as an increase in vascular endothelial growth factor receptor-3, a receptor specific for lymphatic cells. RT-PCR showed that there was increased expression of the lymphatic cell specific markers, Prox-1 and podoplanin, in the distal portion of the hindlimb. Lymphoscintigraphy showed retention of lymphatic flow after 30 minutes, however, eventually all of the radioactive substance drained out from the hindlimb. Conclusion: Our method for creation of lymphedema in mice was effective in creating acute lymphedema. However it failed to retain its edematous properties for long periods of time. Further studies are needed to create a novel method of chronic lymphedema.
Epstein-Barr Virus, Beta-Catenin, and E-cadherin in Gastric Carcinomas
정중기,Young A Kim,Je Eun Kim,In Mok Jung,허승철,Young Joon Ahn,Ki-Tae Hwang,김병관,김철우,이국래,김우호,장미수 대한의학회 2007 Journal of Korean medical science Vol.22 No.5
Activated beta-catenin is suggested to inhibit NF-kappaB activation, and we previously demonstrated that NF-kappaB nuclear positivity was more frequent in Epstein- Barr virus (EBV)-infected gastric carcinomas. It is controversial that beta-catenin and E-cadherin are prognostic markers in gastric carcinomas. To define a relationship between beta-catenin and EBV, and the prognostic value of beta-catenin and E-cadherin, we analyzed in situ hybridization for EBV-encoded small RNAs, betacatenin, and E-cadherin immunohistochemistry, and clinicophatological features in 111 gastric carcinomas. EBV infection was detected in seven carcinomas (6.3%); none of seven showed beta-catenin nuclear accumulation, and five out of seven revealed beta-catenin membranous loss or cytoplamic expression. Eighty cases (72.1%) showed beta-catenin alteration; i.e., loss of membrane staining in 65 (58.6 %), cytoplasmic expression in 35 (31.5%), and nuclear accumulation in 15 (13.5%). E-cadherin alteration was observed in 34 cases (30.6%) and correlated with betacatenin alteration. On multivariate analysis, the combined immunoexpression group of beta-catenin nuclear accumulation/ E-cadherin alteration and the advanced TNM cancer stage group showed poor patient’s survival (p<0.05). In conclusion, betacatenin activation through nuclear accumulation hardly occurred in EBV-infected gastric carcinomas. The combined immunoexpression pattern of beta-catenin and E-cadherin can be used as a prognostic marker in gastric carcinomas.