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뇌정위적 방사선수술 시 콜리메이터 크기 변화에 따른 검출기 의존성 평가
배용기,방동완,박병문,강민영,김연래,Bae, Yong-Ki,Bang, Dong-Wan,Park, Byung-Moon,Kang, Min-Yeong,Kim, Yeon-Rye 대한방사선치료학회 2008 대한방사선치료학회지 Vol.20 No.2
Purpose: To evaluate the detector dependency in the various collimator size for Stereotactic Radiosugery (SRS). Materials and Methods: This study was performed with 6 MV photon beam (Varian 21EX, Varian, US) and the measurement detectors are used by ion chamber CC01, CC13 (Wellhofer, Germany) and stereotactic diode detector (SFD, Wellhofer, Germany). SRS collimator size was used by ${\varphi}$5, 10, 20, 30 mm (Brain Lab, Germany). Percentage depth dose (PDD) was measured at SSD 100 cm and field size 10×10 cm from individual detectors. Ouput factor was measured by using same setup of PDD and with maximum dose depth. Data was normalized at field size $10{\times}10\;cm$. Beam profile was measured at SSD 100 cm in SRS collimator ${\varphi}$10, 30 mm and field $10{\times}10\;cm$ and a comparison of FWHM (full width half maximum), penumbra width (20~80%). Results: The CC13 detector was overestimated 16% than other detectors from the PDD in the 5 mm collimator. Output factors were underestimated CC01 28%, CC13 72% in the 5 mm collimator and CC01 9.6%, CC13 25% in the 10 mm collimator than the SFD. Maximum difference was 3% at the FWHM of the dose profile in the 10 mm collimator and difference of the 30 mm collimator was 0% at the FWHM. Penumbra width was increased CC01 122%, CC13 194% in the 10 mm collimator and CC01 68%, CC13 185% in the 30 mm collimator than the SFD. Conclusion: It is very important for accurate dosimetry to select a detector in small field. The SFD was considered with the most accurate dosimeter for small collimator dosimetry in this study.
배용기,장준혁,양영훈,이주형 한국항해항만학회 2018 한국항해항만학회 학술대회논문집 Vol.2018 No.추계
IT 발전과 함께 디스플레이가 탑재된 제품들을 주변에서 쉽게 찾아볼 수 있다. 제품의 디스플레이는 현재 상태 및 위험도 등 다양한 정보를 시각적으로 사용자에게 제공하는 중요한 역할을 하고 있다. 이로 인하여 시각적으로 사용자에게 좀 더 직관적이고 효율적으로 정보를 제공하는 방법에 대하여 많은 연구들이 진행되고 있으며, GUI 분야의 관심도 높아지고 있다. 항해분야에서 디스플레이가 포함된 항해장 비는 RADAR, ECDIS, ODD 등 다양한 종류가 존재하며, 그 중에서 ECDIS가 가장 많은 시각적인 정보를 제공하고 있다. 이처럼 ECDIS는 항해사들에게 시각적으로 다양한 정보를 제공하는 중요한 장비로써 본 연구에서는 기존의 ECDIS의 요구사항을 조사하며, HCD를 고려하여 개선된 ECDIS 장비의 작업 수행도를 평가하였다.
자동차 전장품 위치 변화에 따른 전자파 내성시험 교정방법에 관한 연구
배민관(Mingwan Bae),우현구(Hyun-Gu Woo),신재곤(Jaekon Shin),김성범(Sungbum Kim),안재성(Jaesung An),용기중(Geejoong Yong) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
According to revolutionary developments in automobile technologies, a variety of advanced vehicles - hybrid vehicle, hydrogen fuel-cell vehicle, electric vehicle, etc. - emerges recently. The safety is getting more important for developing automobiles. The electro-magnetic compatibility has to be assured since those advanced vehicles are equipped with various new electronic systems. Electro-magnetic compatibility tests, in general, consist of EMI (electro-magnetic interference) test and EMS (electro-magnetic susceptibility) test. We investigate the EMS or the immunity test method suggested in KMVSS (Korean Motor Vehicle Safety Standard), and propose more effective test methods.