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( Junyoung Yeo ),( Subeen Lee ),( Hyun Jung Lee ),( Yoon Hee Lee ),( Gun Oh Chong ),( Dae Gy Hong ),( Yoon Soon Lee ) 대한산부인과학회 2020 대한산부인과학회 학술대회 Vol.106 No.-
Objective: This study aimed to compare the surgical outcomes between laparoscopic single port myomectomy (LSPM) and conventional laparoscopic myomectomy (C-LM) by using of a propensity score matching analysis. Methods: Retrospective data of 415 patients who underwent C-LM and 223 patients who underwent LSPM were analyzed. A propensity score matching analysis was performed to control selection bias using age, gravida, parity, body mass index, previous history of pelvic surgery, preoperative hemoglobin level, size, number of myomas, type of myoma, and myoma weights. One hundred and ninety-three patients were selected for each group. Results: The patients characteristics were well balanced between the groups after propensity score matching. Surgical outcomes of the matched LSPM group demonstrated shorter hospital stay (3 d [range, 3-4 d] vs 4 d [range, 3-4 d]; P=.000), shorter operation time (64 min [range, 52-95 min] vs 83 min [range, 64-110 min]; P=.000), and less blood loss (20 ml [range, 10-30 ml] vs 50 ml [range, 25-100 ml]; P=.000). There were no significant changes in hemoglobin drop (1.2 g/dL [range, 0.7-2 g/dL] vs 1.3 g/dL [range, 0.7-2.1 g/dL]; P=.822) and complication rate (3% vs 6 %; P=.134) in the matched LSPM group. Conclusion: Although it was difficult to compare the exact difference owing to the heterogeneity of the disease, the current long-term study demonstrated clinical outcomes of LSPM and C-LM after PS matching analysis, revealing that LSPM had the advantage of shorter hospital stays, shorter operation time, and less blood loss.
Highly Enhanced Performance of Network Channel Polysilicon Thin-Film Transistors
Lee, Hojoon,Lee, Junyoung,Baek, Sangwon,Jeong, Woong Hee,Lee, Yongsu,Yang, Taehoon,Lee, Jeong-Soo IEEE 2017 IEEE electron device letters Vol.38 No.2
<P>This letter presents the electrical characteristics of newly proposed network-channel low-temperature polysilicon channel (LTPS) thin-film transistors (TFTs). Due to effective reduction of grain boundary traps and enhanced gate controllability, the network-channel TFTs show better subthreshold slope, lower threshold voltage, and higher ON-OFF current ratio, compared with conventional planar devices. The extracted grain boundary trap density and the interface trap density are significantly reduced in the network-channel devices. In addition, the network-channel devices show higher immunity to hot-carrier stressing, which are confirmed from the low-frequency noise characteristics with various stressing time. These results suggest that the network-channel devices are very promising for next-generation LTPS TFT applications.</P>
MinSoo Byun,Dahyun Yi,JunHo Lee,YoungMin Choe,BoKyung Sohn,JunYoung Lee,HyoJung Choi,Hyewon Baek,YuKyeong Kim,YunSang Lee,ChulHo Sohn,Inhee MookJung,Murim Choi,YuJin Lee,DongWoo Lee,SeungHo Ryu,ShinGy 대한신경정신의학회 2017 PSYCHIATRY INVESTIGATION Vol.14 No.6
Objective-The Korean Brain Aging Study for the Early Diagnosis and Prediction of Alzheimer’s disease (KBASE) aimed to recruit 650 individuals, aged from 20 to 90 years, to search for new biomarkers of Alzheimer’s disease (AD) and to investigate how multi-faceted lifetime experiences and bodily changes contribute to the brain changes or brain pathologies related to the AD process. Methods-All participants received comprehensive clinical and neuropsychological evaluations, multi-modal brain imaging, including magnetic resonance imaging, magnetic resonance angiography, [11C]Pittsburgh compound B-positron emission tomography (PET), and [18F]fluorodeoxyglucose-PET, blood and genetic marker analyses at baseline, and a subset of participants underwent actigraph monitoring and completed a sleep diary. Participants are to be followed annually with clinical and neuropsychological assessments, and biannually with the full KBASE assessment, including neuroimaging and laboratory tests. Results-As of March 2017, in total, 758 individuals had volunteered for this study. Among them, in total, 591 participants-291 cognitively normal (CN) old-aged individuals, 74 CN young- and middle-aged individuals, 139 individuals with mild cognitive impairment (MCI), and 87 individuals with AD dementia (ADD)-were enrolled at baseline, after excluding 162 individuals. A subset of participants (n=275) underwent actigraph monitoring. Conclusion-The KBASE cohort is a prospective, longitudinal cohort study that recruited participants with a wide age range and a wide distribution of cognitive status (CN, MCI, and ADD) and it has several strengths in its design and methodologies. Details of the recruitment, study methodology, and baseline sample characteristics are described in this paper.
Lee, Hyun Su,Kim, Jae Hyeon,Lee, Junyoung,Kim, Chan Hyeong Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.4
In the present study, a large-area hybrid gamma imaging system was designed by adopting coded aperture imaging on the basis of a large-area Compton camera to achieve high imaging performance throughout a broad energy range (100-2000 keV). The system consisting of a tungsten coded aperture mask and monolithic NaI(Tl) scintillation detectors was designed through a series of Geant4 Monte Carlo radiation transport simulations, in consideration of both imaging sensitivity and imaging resolution. Then, the performance of the system was predicted by Geant4 Monte Carlo simulations for point sources under various conditions. Our simulation results show that the system provides very high imaging sensitivity (i.e., low values for minimum detectable activity, MDA), thus allowing for imaging of low-activity sources at distances impossible with coded aperture imaging or Compton imaging alone. In addition, the imaging resolution of the system was found to be high (i.e., around 6°) over the broad energy range of 59.5-1330 keV.
Development and performance evaluation of large-area hybrid gamma imager (LAHGI)
Lee, Hyun Su,Kim, Jae Hyeon,Lee, Junyoung,Kim, Chan Hyeong Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.8
We report the development of a gamma-ray imaging device, named Large-Area Hybrid Gamma Imager (LAHGI), featuring high imaging sensitivity and good imaging resolution over a broad energy range. A hybrid collimation method, which combines mechanical and electronic collimation, is employed for a stable imaging performance based on large-area scintillation detectors for high imaging sensitivity. The system comprises two monolithic position-sensitive NaI(Tl) scintillation detectors with a crystal area of 27 × 27 cm<sup>2</sup> and a tungsten coded aperture mask with a modified uniformly redundant array (MURA) pattern. The performance of the system was evaluated under several source conditions. The system showed good imaging resolution (i.e., 6.0-8.9° FWHM) for the entire energy range of 59.5-1330 keV considered in the present study. It also showed very high imaging sensitivity, successfully imaging a 253 µCi <sup>137</sup>Cs source located 15 m away in 1 min; this performance is notable considering that the dose rate at the front surface of the system, due to the existence of the <sup>137</sup>Cs source, was only 0.003 µSv/h, which corresponds to ~3% of the background level.
Lee, Jongtaek,Lee, Junyoung,Yang, Jonghee,Park, Taehun,Ahn, Sang Jung,Yi, Whikun American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.8
<P>We synthesized three-dimensional (3-D) SWNT networks suspended on Si pillar architecture. The pillar arrays on Si substrate were formed by a standard photolithography technique using a patterned chrome mask and plasma etching in a SF6:C4F8 gas mixture. Successively, 3-D SWNT networks were synthesized between pillar arrays by a thermal chemical vapor deposition. We investigated the optical properties and formation of 3-D SWNT networks suspended on Si pillar arrays through controlling catalyst deposition methods between pillar arrays by using scanning electron microscopy and Raman spectroscopy. We confirmed that the bridging and connecting of SWNTs between Si pillars, suggesting the effective growth of the 3-D SWNT networks on Si pillar architecture for application to large scale and well-organized devices.</P>