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Magnetic Resonance Imaging: Historical Overview, Technical Developments, and Clinical Applications
Jahng, Geon-Ho,Park, Soonchan,Ryu, Chang-Woo,Cho, Zang-Hee Korean Society of Medical Physics 2020 의학물리 Vol.31 No.3
The authors congratulate the cerebrations for the 30 years of the Korean Society of Medical Physics (http://www.ksmp.or.kr/). The paper is published to recognize the anniversary. Geon-Ho Jahng invited Professor Z. H. Cho to join to submit this manuscript because he has been one of the leaders in the field of magnetic resonance imaging (MRI) during the last 40 years. In this review, we describe the development and clinical histories of MRI internationally and domestically. We also discuss diffusion and perfusion MRI, molecular imaging using MRI and MR spectroscopy (MRS), and the hybrid systems, such as positron emission tomography-MRI (PET-MRI), MR-guided focused ultrasound surgery (MRgFUS), and MRI-guided linear accelerators (MRI-LINACs). In each part, we discuss the historical evolution of the developments, technical developments, and clinical applications.
Jahng, Yurng-Dong,Kim, Jin-Il The Pharmaceutical Society of Korea 1994 Archives of Pharmacal Research Vol.17 No.2
trans-Ethyl 1, 2, 3, 4a, 5, 6, 8a-cotahydro-2-benzyl-4-hydroxy-6-methyl-5-isoquinoline-carboxylate was prepared by intramolecular Diels-Alder reaction as a precusor of newly designed aza-analogue of mevinolin.
Jahng, Yurngdong,Kim, Jin-Il 영남대학교 약품개발연구소 1994 영남대학교 약품개발연구소 연구업적집 Vol.4 No.-
trans-Ethyl 1, 2, 3, 4a, 5, 6, 8a-octahydro-2-benzyl-4-hydroxy-6-methyl-5-isoquinoline-carboxylate was prepared by intramolecular Diels-Alder reaction as a precursor of newly designed aza-analogue of mevinolin.
Visualizing surface plasmon polaritons by their gradient force.
Jahng, Junghoon,Ladani, Faezeh Tork,Khan, Ryan Muhammad,Li, Xiaowei,Lee, Eun Seong,Potma, Eric Olaf Optical Society of America 2015 Optics letters Vol.40 No.21
<P>A new method is presented for visualizing the electric field distributions associated with propagating surface-plasmon-polariton (SPP) modes directly in the near-field. The method is based on detecting the photo-induced gradient force exerted by the evanescent field onto a sharp and polarizable tip. Using a photo-induced force microscope (PiFM), images of propagating SPPs are obtained on flat gold surfaces.</P>
The reaction of (E)-2, 4-pentadienoic acid with aqueous bromine re-evaluation of the product
Jahng, Yurng-Dong,Kim, Jin-Il The Pharmaceutical Society of Korea 1989 Archives of Pharmacal Research Vol.12 No.3
The reaction of (E)-2, 4-pentadienoic acid with aqueous bromine was reinvestigated to affirm the formation of (E)-5-bromo-4-hydroxy-2-pentenoic acid, whose structure was confirmed by the spectroscopic methods as well as the chemical modification.
Jahng, G. H.,Lee, D. K.,Lee, J. M.,Rhee, H. Y.,Ryu, C. W. SPRINGER SCIENCE AND BUSINESS MEDIA 2016 BRAIN IMAGING AND BEHAVIOR Vol.10 No.4
<P>Our goal was to investigate whether three-dimensional (3D) double inversion recovery (DIR) images can show alterations of gray matter volume (GMV) between Alzheimer's disease (AD) patients and nondemented controls and to compare alterations of GMV between groups using DIR images and those using 3D T1-weighted (T1W) images. We included 25 subjects with mild or probable AD, 25 subjects with amnestic mild cognitive impairment (MCI), and 25 elderly cognitively normal (CN) subjects. Group differences in GMV among CN, MCI, and AD patients were tested by voxel-wise, one-way ANOVA. Additional region-of-interest-based comparisons of GMV differences among the three groups for DIR and T1WI were performed using ANCOVA. Finally, ROC curve analysis was performed. In the AD group compared with the CN and MCI groups, GMV was decreased in both DIR and T1W images. However, the areas showing GMV loss were larger in DIR images compared to those in T1W images. Amygdala had the highest area under curve value for both DIR and T1W images. DIR images were sensitive for identifying GMV loss in patients with AD compared with MCI and CN subjects and areas showing GMV loss identified with DIR were extended to more brain areas than those identified with T1W. With DIR, amygdala GMV is the most sensitive in differentiating between subject groups.</P>