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유방암 환자의 3D-CRT, TOMO 방법에 따른 선량 분포 평가
김대웅,김종원,최윤경,김정수,황재웅,정경식,최계숙,Kim, Dae-Woong,Kim, Jong-Won,Choi, Yun-Kyeong,Kim, Jung-Soo,Hwang, Jae-Woong,Jeong, Kyeong-Sik,Choi, Gye-Suk 대한방사선치료학회 2008 대한방사선치료학회지 Vol.20 No.1
Purpose: The goal of radiation treatment is to deliver a prescribed radiation dose to the target volume accurately while minimizing dose to normal tissues. In this paper, we comparing the dose distribution between three dimensional conformal radiation radiotherapy (3D-CRT) and helical tomotherapy (TOMO) plan for partial breast cancer. Materials and Methods: Twenty patients were included in the study, and plans for two techniques were developed for each patient (left breast:10 patients, right breast:10 patients). For each patient 3D-CRT planning was using pinnacle planning system, inverse plan was made using Tomotherapy Hi-Art system and using the same targets and optimization goals. We comparing the Homogeneity index (HI), Conformity index (CI) and sparing of the organs at risk for dose-volume histogram. Results: Whereas the HI, CI of TOMO was significantly better than the other, 3D-CRT was observed to have significantly poorer HI, CI. The percentage ipsilateral non-PTV breast volume that was delivered 50% of the prescribed dose was 3D-CRT (mean: 40.4%), TOMO (mean: 18.3%). The average ipsilateral lung volume percentage receiving 20% of the PD was 3D-CRT (mean: 4.8%), TOMO (mean: 14.2), concerning the average heart volume receiving 20% and 10% of the PD during treatment of left breast cancer 3D-CRT (mean: 1.6%, 3.0%), TOMO (mean: 9.7%, 26.3%) Conclusion: In summary, 3D-CRT and TOMO techniques were found to have acceptable PTV coverage in our study. However, in TOMO, high conformity to the PTV and effective breast tissue sparing was achieved at the expense of considerable dose exposure to the lung and heart.
김대웅,백용혁,Kim, Dae-Woong,Baik, Yong-Hyuck 한국세라믹학회 2001 한국세라믹학회지 Vol.38 No.9
Bayer process는 보오크사이트로부터 수산화알루미늄을 추출시키는 가장 일반적인 방법으로 공정 조건에 따라 수산화알루미늄의 1차 입자경, 입도분포도 및 생산효율 등이 달라지게 된다. 본 실험에서는 앞선 석출실험 결과를 기준으로 화학제품용 및 금속제련용 수산화알루미늄 제조조건을 설정하여 석출제품의 특성을 검토하였다. 그 결과 석출율은 화학제품용 원료 제조조건이 높게 나타났으며 입자크기는 화학제품용은 42∼44${\mu}$m, 금속제련용은 74∼77${\mu}$m로 금속제련용 원료 제조조건이 입자크기가 크게 나타났다. 산용해 실험결과는 화학제품용 원료가 금속제련용 원료보다 용해성이 좋게 나타났으며, 금속제련용 제품의 마모도는 상업용 금속제련용 제품에 비해 다소 떨어지는데 이러한 이유는 타사 제품에 비해 1차입자가 작가 때문인 것으로 판단된다. Bayer process is based on the extraction of aluminium trihydroxide from bauxite. The process is operated with the several criteria such as primary crystal size, particle size distribution and yield etc.. In this study basing on the previous results, an investigation on the effect of chemical grade and smelting grade aluminium trihydroxide precipitation condition were undertaken. As a result, particle size was 42∼44${\mu}$m form chemical grade product and 74∼77${\mu}$m for smelting grade product. The yield and solubility by acid of chemical grade product was higher than smelting grade product. The attrition index of smelting grade product was lower than that of other commercial product because primary crystal size of the smelting grade product was small.
대형영상에서 관심영역의 효율적인 추출을 위한 계층적 Snake 알고리즘
김대웅(Dae-Woong Kim),한광수(Kwang-soo Hahn),한영준(Young-Joon Han),한헌수(Hern-Soo Hahn) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
시각적인 효과를 높이기 위해 대형 영상이 다양한 분야에 사용됨으로써 대형 영상(large image)에서 관심 영역의 추출에 관한 연구가 활발히 진행되고 있다. 본 논문은 카메라로부터 획득된 다수개의 영상으로부터 대형 영상으로 재구성하고, 제안하는 계층적 스네이크 알고리즘을 이용하여 관심 영역의 분할을 개선하였으며 수행 시간을 크게 줄였다. 제안하는 알고리즘의 성능은 1280*960 해상도를 갖는 다양한 영상들을 사용하는 실험을 통해 입증하였다.