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Silent Discharge와 TiO₂광촉매 산화반응을 이용한 VOCs 처리
박석출,정창훈,서정민,최금찬 동아대학교 환경문제연구소 1999 硏究報告 Vol.22 No.2
This study has been carried out for evaluation of VOCs treatment let out at the industrial field using a silent discharge process through process approvement and TiO₂ photocatalytic oxidation. And it was presented experimental results on the silent discharge plasma and TiO₂ photocatalytic oxidation processes at atmospheric pressure gas streams containing diluted concentrations of benzene, toluene, and xylene out of VOCs. It has shown that each concentration, background gas, flowrate, and applied power have effected on three materials decomposition and byproduct distribution. Analyses of benzene, toluene, xylene and byproduct concentration was carried out by GC-FID.
Alloy 600 합금의 내부식성 향상을 위한 레이저 표면 합금화
김정수,서정훈,강석중,신진국,국일현 한국레이저가공학회 1999 한국레이저가공학회지 Vol.2 No.1
The surface of Alloy 600 was alloyed using a continuous wave CO₂ laser beam in order to improve its corrosion resistance. Laser surface alloying (LSA) was done by melting the surface electroplated with Cr of the alloy. The Cr concentration of the alloyed surface was 28∼30 at.%, which is similar to that of Alloy 690. Alloying elements in the alloyed layer was observed to be distributed very homogeneously all over the alloyed region. According to the electrochemical and modified Huey tests, the corrosion resistance, in particular the grain boundary corrosion resistance, of the LSA specimens was significantly improved, compared with that of the as-received(AR) specimen. This improved corrosion resistance of the alloyed specimen might be attributed to the high Cr content, which could make possible formation of more stable and dense passive film onto its surface.
Expression of Alzheimer's amyloid precursor protein in human lymphocyte
Suh, Yoo-Hun,Choi, Woong,Kim, Seong-Hun,Kim, Jong-Suk,Rhi, Bou-Yong,Chong, Young Hae,Woo, Jong Inn,Kwang-Woo 이화여자대학교 생명과학연구소 1996 생명과학연구논문집 Vol.7 No.-
β-Amyloid precursor protein(βAPP)has been shown to be involved in cell growth regulation. In spleen, the majority of cells showing βAPP like immunoreactivity was found in the T cell-dependent zone. In Northern blot, the expression of βAPP was increased to reach the peak at 72 h after the treatment of phytohemagglutinin(PHA). But in cytofluorometry, almost all CD4^+ T helper/inducer cells and the majority of CD8^+ T suppressor/cytotoxic cells show βAPP immunoreactivity which remained constant during the stimulation with PHA. These results suggest that βAPP is a surface molecule of T lymphocyte and the turnover or release of APP might be increased with the treatment of T cell mitogen.
Suh,Tae-Suk,Suh,Doug-Young,Park,Sung-Hun,Jang,Hong-Seok,Choe,Bo-Young,Yoon,Sei-Chul,Shinn,Kyung-Sub,Bahk,Yong-Whee,Kim,Il-Hwan,Kang,Wee-Sang,Ha,Sung-Whan,Park,Charn-Il 대한방사선 방어학회 1995 방사선방어학회지 Vol.20 No.1
본 연구는 방사선 수술시 필수적으로 이용되는 환자의 정위적 데이터 및 방사선 측정 데이터를 효율적으로 처리하여 종래의 시행착오적 방식을 통한 수술 계획상의 오류 및 부정확성을 지양하고 능률적이고 효율적인 수술이 될 수 있도록 하는데 목적이 있다. 정위시스템 개발을 위하여 Fisher 프레임이 사용되었으며, 뇌혈관 촬영 및 CT의 정위적 방법에 의하여 병변의 위치를 3 차원적으로 정확히 얻을 수 있는 알고리듬을 개발하였다. 정위시스템 과정은 컴퓨터에 의해 쉽게 운열될 수 있도록 프로그램화하였으며, 환자 영상을 컴퓨터에 입력하는 과정, 입력된 영상으로부터 병소 및 위치측정 보조기구 (localizer)에 대한 정보를 추출하는 과정, 입력된 영상의 위치 정보로부터 병소의 3 차원적 정위좌표로 변환하는 과정 등으로 나누었다. 좌표 변환 계산은 실시산에 구해졌으며, CT 및 혈관촬영술의 정위적 방법에 의하여 얻어진 병소의 3차원 좌표를 서로 비교한 결과 오차는 통상적으로 인정되는 2 mm 이내였다. NEC 6 MVX 선형 가속기를 사용하여 소조사면 선량을 측정하였다. 사용된 측정기로는 전리함(ion chamber), 필름, 다이오드 등이며, 측정된 값은 출력 계수, 깊이선량률 (PDD), 최대조직선량비(TMR), 축선량비 (OAR) 등이다. 측정기의 종류에 따라, 측정치가 조금씩 상이했으나, 전반적으로 같은 경향을 보여 줌으로 써 측정치의 신뢰도를 확인할 수 있었다. 제작된 구형 물팬톰과 필름을 이용하여 표준 방사선 치료시 예측했던 선량 분포가 실제 나오는가를 실험을 통하여 확인하였으며, 예측한 선량 값을 얻을 수 있었다. 본 연구를 통하여 개인용컴퓨터에 의해 병소의 정위좌표를 정확히 얻을 수 있는 프로그램이 개발되었고, 소조사면을 간단하고 편리하게 잴 수 있는 방법을 개발함으로써 방사선 수술에 많은 도움이 될 것으로 사료된다. The purpose of this research is to develop stereotactic localization and radiation measurement system for the efficient and precise radiosurgery. The algorithm to obtain a 3-D stereotactic coordinates of the target has been developed using a Fisher CT or angio localization. The procedure of stereotactic localization was programmed with PC computer, and consists of three steps: (1) transferring patient images into PC; (2) marking the position of target and reference points of the localizaer from the patient image; (3) computing the stereotactic 3-D coordinates of target associated with position information of localizer. Coordinate transformation was quickly done on a real time base. The difference of coordinates computed from between Angio and CT localization method was within 2 mm, which could be generally accepted for the reliability of the localization system developed. We measured dose distribution in small fields of NEC 6 MVX linear accelerator using various detector; ion chamber, film, diode. Specific quantities measured include output factor, percent depth dose (PDD), tissue maximum ratio (TMR), off-axis ratio (OAR). There was small variation of measured data according to the different kinds of detectors used. The overall trends of measured beam data were similar enough to rely on our measurement. The measurement was performed with the use of hand-made spherical water phantom and film for standard arc set-up. We obtained the dose distribution as we expected. In conclusion, PC-based 3-D stereotactic localization system was developed to determine the stereotactic coordinate of the target. A convenient technique for the small field measurement was demonstrated. Those methods will be much helpful for the stereotactic radiosurgery.
IBM Personal Computer를 이용한 3차원적 뇌정위 방사선 수술계획 시스템의 개발
서태석(Tae-Suk Suh),서덕영(Doug-Young Suh),박찬일(Charn Il Park),하성환(Sung Whan Ha),강위생(Wee Saing Kang),박승훈(Sung Hun Park),윤세철(Sei Chul Yoon) 대한방사선종양학회 1993 Radiation Oncology Journal Vol.11 No.1
Recently, stereotactic radiosurgery plan is required with the information of 3-D image and dose distribution, A project has been doing in developing LINAC based stereotactic radiosurgery since April 1991. The purpose of this research is to develop 3-D radiosurgery planning system using personal computer. The procedure of this research is based on two steps. The first step is to develop 3-D localization system, which input the image information of the patient, coordinate transformation, the position and shape of target, and patient contour into computer system using CT image and stereotactic frame. The second step isto develop 3-D dose planning system, which compute dose distribution on image plane, display on high resolution monitor both isodose distribution and patient image simultaneously and develop menu-driven planning system. This prototype of radiosurgery planning system was applied recently for several clinical cases. It was shown that our planning system is fast, accurate and efficient while making it possible to handle various kinds of image modalities such as angiography, CT and MRI. It makes it possible to develop general 3-d planning system using beam's eye view or CT simulation in radiation therapy in future.
A New Early Maturing, Leaf Spot Resistant and High Quality Peanut Cultivar, Jakwang
Suk Bok Pae,Young Keun Cheong,Jung Tae Kim,Ki Hun Park,Duk Yong Suh 한국육종학회 2004 한국육종학회지 Vol.36 No.5
A new peanut (Arachis hypogaea L.) variety “Jakwang” was developed from the cross between HYQ(CG)S-10 and Suwon 101 by the Yongnam Agricultural Research Institute(YARI) and Honam Agricultural Research Institute(HARI) in 2003. This variety has Shinpung typ