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창상 환경에 따른 돼지 복합피부조직이식의 생착에 관한 연구
원동철,손대구,한기환,박관규 대한성형외과학회 2003 Archives of Plastic Surgery Vol.30 No.6
Composite grafts have served as a versatile tool in plastic surgery, but their usefulness has been limited by unpredictable survival in the case of larger defects. We compared composite grafts take rates in a wet environment, known to be ideal for wound healing, a moist environment with mild compression, and a dry environment in an established porcine model. The subjects of this study were 7 female Yorkshire pigs with 54 composite grafts. These 3×3cm sized composite grafts, composed of skin and subcutaneous fat, were harvested as samples on the back of the subjects to be reimplanted based on random patterns. Group I was introduced to a wet environment with sufficient antibiotic ointment and semi-occlusive polyurethane film(Opsite??) coverage, while group II was introduced to a moist environment and mild compression with hydrocellular foam dressing(Allevyn??) and Opsite?? coverage. Meanwhile, group III was applied simply with dry. Two weeks after the grafting, the survival rates of groups I(89%) and II(83%) were significantly higher than those of group III(31%)(p<0.05). The degrees of inflammation and fibrosis in groups I and II were less than in group III. Epithelial connections between the grafts and the recipients were the fastest in group II.According to the results of this study, maintaining a wet environment and mild compression may not only increase the composite graft take rate but also increase the size of grafts that could be transferred successfully.
Cryptococcus neoformans 감염 환자의 임상적 특징 및 진단 방법의 평가
원동일,김현숙,이경원,정윤섭 대한감염학회 1998 감염 Vol.30 No.1
목 적 : Cryptococcus neoformans는 면역부전인 환자에서 중요성이 증대되는 진균이다. 본 연구에서는 크립토코쿠스증 환자들의 임상양상과 미생물학적 검사소견의 특징을 조사하였다. 방 법 : 1983년부터 1995년 사이에 세브란스병원에 내원한 크립토코쿠스증 환자의 의무기록과 검사 기록을 후향 분석하였다. 결 과 : 세브란스병원에서 진료한 크립코코쿠스증 환자수는 1983년 이후 13년간에 45명이었다. 크립토코쿠스증 환자 중 선행질환이 있었던 환자는 26명이었고, AIDS 환자도 2명 있었다. 중추신경계 감염 환자는 43명 중 41명(95%)이었고 중추신경계 이외 감염은 적었다. 크립토코쿠스증 환자에서 크립토코쿠스 항원 검사, 배양, 묵즙표본 검사, 그람염색의 양성률은 각각 100%, 87%, 60%, 51%이었다 회복된 환자에서 크립토코쿠스 항원 검사, 묵즙표본 검사, 배양의 평균 양성지속 기간은 각각 69일, 26일, 12일이었다. 결 론 : 세브란스병원의 크립토코쿠스증 환자수는 증가 추세인데, 이는 면역부전 등의 선행질환을 가진 환자가 증가함에 따른 것으로 생각되며, 지단을 위해서는 빠르고 예민도가 매우 높은 선별검사인 크립토코쿠스 항원 검사를 추가하여 시행하는 것이 바람직할 것으로 판단되었다. Background : Cryptococcus neoformans is an increasingly important pathogen in the immunosuppressed hosts. The aim of this study was to determine any change of the clinical features and to evaluate the laboratory diagnosis in cryptococcosis patients. Methods : The clinical features of cryptococcsis patients who were diagnosed in Severance Hospital during the 1983∼1995 were reviewed retrospectively and various diagnostic laboratory tests, especially latex cryptococcal antigen test were evaluated. Results : The number of crytococcosis patients increased over the years. Twenty-six patients had various underlying diseases including two AIDS patients. Of the 43 patients, 41(95%) had CNS infections, while the patients with non-CNS infections were 10(23%). Latex antigen test, culture, India ink preparation, and Gram stain were positive in 100%, 87 %, 60% and 51%, respectively. Positively of latex antigen test, India ink preparation, and culture persisted in average 69 days, 26 days, and 23 days, respectively in recovered patients. Conclusion : The number of cryptococcosis patients is an increasing trend in the Severance Hospital probably due to the increase of immunocompromised patients, and latex antigen test is a highly sensitive and reliable screening test for the laboratory diagnosis.
원동재,김선영,장철호,이진실,고정아,박현진 한국식품과학회 2018 Food Science and Biotechnology Vol.27 No.2
The aim of this study was to investigate the optimal conditions to process vitamin D2-fortified shiitake mushrooms through UV irradiation for industrial processing. Response surface methodology was used to identify the optimum conditions of the following highly influential factors on vitamin D2 synthesis: temperature, UV dosage, and moisture content. The optimal conditions of those variables were 40.56 C, 36.27 kJ/m2, and 80.46%, respectively, and UV dosage was the most effective variable. The amount of vitamin D2 obtained under the optimal conditions was 29.87 ± 1.38 lg/g (dry mass: DM) which was well matched with the predicted value of 32.33 lg/g DM. The effects on the texture and color of shiitake mushrooms were also evaluated after the fortification process under the optimal conditions, and no adverse effects were observed compared to those of fresh shiitake mushrooms.
원동일,송규섭,서장수,이원길 대한진단검사의학회 2005 Annals of Laboratory Medicine Vol.25 No.3
Background : Cytokine response changes with ageing. CD26 is known as an operational marker for Th1 pathway. In this study we investigated the possibility of CD26 as a practical marker for mmunosenescence, Th1 or Th2 polarization. Methods : We studied 99 subjects from 4 groups divided by age (thirties and sixties) and by hepatitis B. CD26 expression in T cells in peripheral blood was investigated by 3 color flow cytometry. Especially, CD26 expression in activated (HLA-DR+) T cells was compared among each group. Results : CD26 expression in total T cells had the trend toward a decrease with ageing and decreased significantly especially in Ts cells (from 45.9±11.3% to 37.5±12.4%, P<0.05). Regardless of hepatitis B, CD26 expression in activated Th cells was not significantly different between the two age groups. HLA-DR expression in total T cells had the trend toward an increase in the elderly or hepatitis B and the dominant T cell subset responsible for this increase was Ts cell subset in the elderly and was Th cell subset in hepatitis B. Conclusions : We could not find the possibility of CD26 as a practical marker for immunosenescence reflecting Th1 polarization in activated Th cells. But CD26 or HLA-DR expression in total T cells had the trend to change with ageing and the change in Ts cells was more dominant than in Th cells. 서론 : 노화에 따른 cytokine 반응의 변화가 보고되고 있고, Th1대리 표지자로 CD26이 알려져 있다. 본 연구에서는 면역노화 중하나인 Th1 혹은 Th2 편향에 대하여 CD26이 실용적인 표지자가될 수 있는지 조사하였다.방법 : 연령(30대와 60대)과 B형간염 유무에 따른 4군, 총 9명을 대상으로, 3색염색 유세포분석법으로 말초혈액 T 세포에서CD26의 표현을 조사하였다. 특히, 각 군에서 활성화(HLA-DR+)Th 세포에서 CD26의 표현을 비교하였다.결과 : 노화에 따라 총 T 세포에서 CD26 표현이 감소하는 경향이 있었고, 특히 Ts 세포에서 감소가 유의하였다(45.9± 11.3%에서 37.5± 12.4%로, P<0.05). B형간염에 상관없이 두 연령군간활성화 Th 세포에서 CD26 표현에 유의한 차이는 없었다. 총 T세포에서 HLA-DR의 표현은 노인군이나 B형간염에서 증가하는경향이 있었고, 이 증가를 초래한 T 세포의 주 아형은 노인군에서 Ts 세포에서, B형간염에서 Th 세포이었다. 결론 : 활성화 Th 세포에서 Th1 편향을 반영하는, CD26의 면역노화에 대한 실용적 표지자로서의 가능성은 발견할 수 없었으나, 노화에 따라 총 T 세포에서의 CD26 혹은 HLA-DR 표현이 변화하는 경향이 있었으며 그 변화는 Th 세포보다 Ts 세포에서 우세하였다.
원동조(Dong-Jo Won),이주혁(Joo-Hyuk Lee),김재형(Jae-Hyung Kim),원충연(Chung-Yuen Won),정용채(Yong-Chae Jung) 한국조명·전기설비학회 2008 한국조명·전기설비학회 학술대회논문집 Vol.2008 No.5월
In this paper, we propose the battery charging device for electric bicycle using photovoltaic power. DC voltage from the solar cells is low, it needs to be step-up by the power conversion device. The power conversion device applied to this paper is phase-shift full-bridge converter. This converter steps-up from 12~22[Vdc] to 36[Vdc] for charging the. battery of electric bicycle. Phase-shift full-bridge converter(PSFB) can obtain twice as much DC voltage compared with half-bridge converter, thus it has lower current stress less than half-bridge converter. It is simulated and tested the battery charging device using photovoltaic power.