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호흡동조 정위체부방사선치료에서 Gated Cone-beam CT의 유용성 평가
홍성윤,이충환,박제완,송흥권,윤인하,Hong sung yun,Lee chung hwan,Park je wan,Song heung kwon,Yoon in ha 대한방사선치료학회 2022 대한방사선치료학회지 Vol.34 No.-
Purpose: Conventional CBCT(Cone-beam Computed-tomography) caused an error in the target volume due to organ movement in the area affected by respiratory movement. The purpose of this paper is to evaluate the usefulness of accuracy and time spent using the Gated CBCT function, which reduces errors when performing RGRT(respiratory gated radiation therapy), and to examine the appropriateness of phase. Materials and methods: To evaluate the usefulness of Gated CBCT, the QUASAR<sup>TM</sup> respiratory motion phantom was used in the Truebeam STx<sup>TM</sup>. Using lead marker inserts, Gated CBCT was scaned 5 times for every 20~80% phase, 30~70% phase, and 40~60% phase to measure the blurring length of the lead marker, and the distance the lead marker moves from the top phase to the end of the phase was measured 5 times. Using Cedar Solid Tumor Inserts, 4DCT was scanned for every phase, 20-80%, 30-70%, and 40-60%, and the target volume was contoured and the length was measured five times in the axial direction (S-I direction). Result: In Gated CBCT scaned using lead marker inserts, the axial moving distance of the lead marker on average was measured to be 4.46cm in the full phase, 3.11cm in the 20-80% phase, 1.94cm in the 30-70% phase, 0.90cm in the 40-60% phase. In Fluoroscopy, the axial moving distance of the lead marker on average was 4.38cm and the distance on average from the top phase to the beam off phase was 3.342cm in the 20-80% phase, 3.342cm in the 30-70% phase, and 0.84cm in the 40-60% phase. Comparing the results, the difference in the full phase was 0.08cm, the 20~80% phase was 0.23cm, the 30~70% phase was 0.10cm, and the 40~60% phase was 0.07cm. The axial lengths of ITV(Internal Target Volume) and PTV(Planning Target Volume) contoured by 4DCT taken using cedar solid tumor inserts were measured to be 6.40cm and 7.40cm in the full phase, 4.96cm and 5.96cm in the 20~80% phase, 4.42cm and 5.42cm in the 30~70% phase, and 2.95cm and 3.95cm in the 40~60% phase. In the Gated CBCT, the axial lengths on average was measured to be 6.35 cm in the full phase, 5.25 cm in the 20-80% phase, 4.04 cm in the 30-70% phase, and 3.08 cm in the 40-60% phase. Comparing the results, it was confirmed that the error was within ±8.5% of ITV Conclusion: Conventional CBCT had a problem that errors occurred due to organ movement in areas affected by respiratory movement, but through this study, obtained an image similar to the target volume of the setting phase using Gated CBCT and verified its usefulness. However, as the setting phase decreases, the scan time was increases. Therefore, considering the scan time and the error in setting phase, It is recommended to apply it to patients with respiratory coordinated stereotactic radiation therapy using a wide phase of 30-70% or more.
검도지도자의 커뮤니케이션 스타일과 라포 및 수련만족도 간의 구조적 관계
홍성윤(Hong, Sung-Yoon),신승호(Shin, Seung-Ho) 한국체육과학회 2020 한국체육과학회지 Vol.29 No.1
The purpose of this study was to determine the structural relationships among the Kumdo instructors’ communication style, rapport and training satisfaction. Furthermore, it was to suggest methods to manage the Kumdo club and to ensure competitiveness by providing information for the Kumdo instructor’s effective teaching method and also the human resource management. In order to achieve the purpose of this study, subjects were collected from 250 Kumdo learners of 10 Kumdo clubs in metropolitan area by using convenience sampling method. Among the 250 questionnaires of Kumdo learners, 248(99.2%) of them were used for the final analysis. By using Windows for SPSS 21.0 and AMOS 21.0, methods such as descriptive statistics, reliability analysis, correlation analysis, confirmatory factor analysis, and structural equation model were conducted for data analysis. Consequently, the result of this study was as follows. First, among the communication styles of Kumdo instructors, trust, cooperative and professional type of communication styles had a significant impact on rapport-building between Kumdo instructors and learners. Second, trust and cooperative type of communication styles had a significant impact on the training satisfaction of Kumdo learners. Third, the rapport between Kumdo instructors and the learners had a significant impact on training satisfaction.
HOOO-(H<sub>2</sub>O)<sub>n</sub> (n=1~5) 클러스터의 구조와 에너지에 대한 이론적 연구
김종민,홍성윤,김승준,Kim, Jong-Min,Hong, Sung-Yoon,Kim, Seung-Joon 대한화학회 2015 대한화학회지 Vol.59 No.5
HOOO-(H<sub>2</sub>O)<sub>n</sub> (n=1~5) 클러스터에 대해서 다양한 기저집합과 밀도 범함수 이론(DFT) 및 순 이론(ab initio) 방법을 사용하여 가능한 여러 구조를 최적화하고 결합에너지와 조화진동수를 계산하였다. HOOO 단량체의 경우에는 CCSD(T) 이론 수준에서 trans 구조가 cis 구조보다 열역학적으로 더 안정한 것으로 계산되었다. HOOO-(H<sub>2</sub>O)<sub>n</sub> 클러스터에 대해서는 B3LYP/aug-cc-pVTZ와 CAM-B3LYP/aug-cc-pVTZ 이론 수준에서 분자 구조를 최적화하고 열역학적으로 가장 안정한 분자구조를 예측하였다. HOOO-H<sub>2</sub>O 클러스터의 결합에너지는 MP2//CAM-B3LYP 한 점 에너지 계산에서 영점 진동에너지(ZPVE)와 바탕 집합 중첩에러(BSSE)까지 모두 보정한 후 6.05 kcal/mol로 계산되었으며, n=2-5의 경우에는 물 분자의 수가 증가 할수록 물분자 1개 당 평균 결합에너지는 증가하여 약 7.2 kcal/mol의 값으로 수렴하였다. The DFT and ab initio calculations have been performed to elucidate hydrogen interaction of HOOO-(H<sub>2</sub>O)<sub>n</sub> (n=1~5) clusters. The optimized geometries, harmonic vibrational frequencies, and binding energies are predicted at various levels of theory. The trans conformer of HOOO monomer is predicted to be thermodynamically more stable than cis form at the CCSD(T) level of theory. For HOOO-(H<sub>2</sub>O)<sub>n</sub> clusters, the geometries are optimized at B3LYP/aug-cc-pVTZ and CAM-B3LYP/aug-cc-pVTZ levels of theory. The binding energy of HOOO-H<sub>2</sub>O cluster is predicted to be 6.05 kcal/mol at the MP2//CAM-B3LYP/ aug-cc-pVTZ level of theory after zero-point vibrational energy (ZPVE) and basis set superposition error (BSSE) correction. The average binding energy per H<sub>2</sub>O is increased according to adding a H<sub>2</sub>O moiety in HOOO-(H<sub>2</sub>O)<sub>n</sub> clusters up to 7.2 kcal/mol for n=5.
Alcaligenes Fecalis 로 인한 Bacteremic Shock 1 예
우옥규 ( Ok Kyu Woo ),홍성윤 ( Sung Yoon Hong ),한진석 ( Jin Suk Han ) 대한내과학회 1969 대한내과학회지 Vol.12 No.10
It has been increasing importance that the shock associated with bacteremia due to gram negative enteric bacilli in the world. Reviewing some of literatures, this paper presented a case of bacteremic shock due to alcaligenes fecalis which was not reported
2회선 지중송전선로의 부하량에 따른 최적 상배치 해석 연구
오치수(Chi-Su Oh),안호성(Ho-Sung An),이승우(Seung-Woo Lee),김상범(Sang-Beom Kim),홍성윤(Sung-Yoon Hong),임윤석(Yun-Seog Lim) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
본 논문에서는 2회선 지중송전선로(관로)의 회선별 부하량에 따른 최적의 상배치 도출을 위한 수치해석을 진행하였다. 수치해석을 위해 선로의 매설 심도, 상간 거리는 고정하였고, 케이블 시스 및 접지는 고려하지 않은 상태에서 2회선의 부하 크기를 각각 변화시켰을 때 계산되는 자계값 저감이 가장 큰 상배치를 도출하였다. 계산 결과 전류의 크기와 상관없이 2회선이 ㄴ-ㄱ구조로 배열될 경우 CBA-ABC의 역상배열이 ABC-ABC의 기본 배열 대비 약 83%의 저감을 보였다. 향후 2회선 이상의 다회선에 대한 최적 상배치, 조류 방향, 회선별 전류값이 상이할 경우 등에 대한 추가적인 해석이 필요하다.