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Parametrized Phase Shift Model Analysis for 350 MeV 7Li Elastic Scattering on 12C and 28Si
김용주 한국물리학회 2020 New Physics: Sae Mulli Vol.70 No.1
The elastic scattering cross sections of 350 MeV 7Li incident on 12C and 28Si target nuclei were analyzed using the parametrized phase shift model. The calculated results reproduced satisfactorily the structures of the angular distribution, and a comparison with experiment gave excellent agreement over the entire angular range. The diffractive oscillatory structures observed in the angular distributions can be understood in terms of the strong interferences between the near-side and the far-side scattering amplitudes while the scattering behavior of a structureless decreasing pattern at large angles is entirely determined by the far-side scattering. The parametrized phase shift was employed to evaluate the optical potential by using the inversion method. The calculated inversion potentials were compared to the Woods-Saxon potentials obtained from an optical model analysis.
고속액체 크로마토그라프법을 이용한 제제중 Aclatonium Napadisilate 의 정량 및 함량균일성에 관한 연구
김용주,허재두,김면종,박세호,노회숙 한국약제학회 1986 Journal of Pharmaceutical Investigation Vol.16 No.2
A convenient high performance liquid chromatographic method was established for the quantitative determination and content uniformity test of aclatonium napadisilate preparation. This method was more simple to make the sample solution for injection, and easy to determine the content in the preparation. Aclatonium napadisilate was chromatographed using a Lichrosorb-NH₂ column (4㎜ × 25 ㎝, and acetonitrile-water mixture (83:17) as an eluent at a flow rate of 1.8 ㎖/min. RI-detector response was linear over a range of 0.5∼2.0% aclatonium napadisilate under above conditions. Reproducibility studies gave relative standard deviation of 1.29%.
척추 전이의 진단: 확산강조 자기공명영상 추가의 유용성
김용주,이준우,이영준,박찬규,강유선,AHN JOONG MO,강흥식 대한영상의학회 2019 대한영상의학회지 Vol.80 No.6
Purpose To determine the usefulness of diffusion weighted-MRI (DW-MRI) in the evaluation of spinal metastasis. Materials and Methods From July to August 2017, 48 whole-spine DW-MRI to detect metastasis in patients with extra-spinal tumors were retrospectively evaluated by three radiologists. The usefulness of DW-MRI was evaluated in four groups based on the change in confidence rating between two sessions: 1 (T1- and T2-weighted and contrast-enhanced images) and 2 (additional DW-MRI). The associations of the usefulness with age, sex, primary cancer, bone type with metastasis, number of probable metastatic segments in session 1, and anatomic locations were assessed in vertebral body and posterior element cases. Results According to the readers 1, 2, and 3, there were 18, 19, and 16 vertebral body cases, respectively, and 12, 13, and 9 posterior element cases, respectively. In the group with no excepted metastasis, DW-MRI was useful in 52–59% of vertebral body cases and 39–67% of posterior element cases. There were no significant differences in the usefulness with respect to the number of probable metastatic segments in session 1, age, sex, primary cancer, bone type with metastasis, or anatomic location. Conclusion DW-MRI could be used to evaluate spinal metastasis. However, there were no differences in the usefulness with respect to the anatomic location. 목적 척추 전이의 평가에 있어 확산강조 자기공명영상의 유용성을 확인하고자 한다. 대상과 방법 2017년 7월과 8월 사이에 얻어진, 척추 외 원발암이 있는 환자들 중 척추 전이 평가를 위한 확산강조 자기공명영상 48건을 영상의학과 의사 3명이 후향적으로 평가하였다. 척추 전이 평가에 대한 확산강조영상의 유용성을 2세션 사이의 신뢰등급 변화를 기반으로 4그룹으로 평가하였다: 세션 1 (T1 및 T2 강조 영상과 조영 증강 영상), 세션 2 (확산강조영상을추가). 임상 정보(나이, 성별, 원발 종양, 전이의 유형), 세션 1의 probably metastasis 분절 수, 해부학적 위치(척추뼈몸통, 척추뒤고리)와 유용성 간의 상관관계를 분석하였다. 결과 척추뼈몸통 기준으로 definitely useful 그룹은 reader 1, 2, 3에서 각각 18, 19, 16명, 척추뒤고리 기준으로 12, 13, 9명이었다. 척추 전이가 없는 그룹을 제외하면, 확산강조영상은척추뼈몸통 기준 52~59%, 척추뒤고리 기준 39~67%에서 유용하였다. 나이, 성별, 원발 종양, 전이의 유형, 해부학적 위치에 따른 유용성에 유의한 차이는 없었다. 결론 확산강조 자기공명영상은 척추 전이의 평가에 유용하였지만, 해부학적 위치에 따른 유용성에 차이는 없었다.
Scalable Application Mapping for SIMD Reconfigurable Architecture
김용주,이종은,이진용,백윤흥 대한전자공학회 2015 Journal of semiconductor technology and science Vol.15 No.6
Coarse-Grained Reconfigurable Architec- ture (CGRA) is a very promising platform that provides fast turn-around-time as well as very high energy efficiency for multimedia applications. One of the problems with CGRAs, however, is application mapping, which currently does not scale well with geometrically increasing numbers of cores. To mitigate the scalability problem, this paper discusses how to use the SIMD (Single Instruction Multiple Data) paradigm for CGRAs. While the idea of SIMD is not new, SIMD can complicate the mapping problem by adding an additional dimension of iteration mapping to the already complex problem of operation and data mapping, which are all inter-dependent, and can thus significantly affect performance through memory bank conflicts. In this paper, based on a new architecture called SIMD reconfigurable architecture, which allows SIMD execution at multiple levels of granularity, we present how to minimize bank conflicts considering all three related sub-problems, for various RA organizations. We also present data tiling and evaluate a conflict-free scheduling algorithm as a way to eliminate bank conflicts for a certain class of mapping problem.