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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>
( 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.
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, 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>
Dental imaging characterization of micropigs
Lee, Hyeyeon,Choi, Mihyun,Chang, Jinhwa,Jung, Joohyun,Kim, Mieun,Lee, Namsoon,Kim, Junyoung,Choi, Mincheol The Korean Society of Veterinary Science 2010 大韓獸醫學會誌 Vol.50 No.4
Recently the micropig has been developed as human disease model. The dental and orofacial region of micropig is similar to that of humans, so it has been used for testing implant materials and techniques. The purpose of this study is on dental image at each age using radiography and computed tomography. Total twenty-two male micropigs, two or three animals of each 1, 3, 5, 7, 9, 12, 18 and 24 months old, were given radiographic examinations. After general anesthesia, extra- and intra-oral radiographic technique and computed tomographic scans were performed to assess the dental characterization of micropigs. The total deciduous dental formula comprised 28 teeth and was depicted as Di 3/3, Dc 1/1, Dp 3/3. The total permanent dental formula comprised 44 teeth and was depicted as I 3/3, C 1/1, P 4/4, M 3/3. Hypodontia of the first premolars was common in the micropig. The permanent teeth erupted from 3 to 24 month after birth. The sequence of eruption of the permanent teeth was M1, P1, I3, C, M2, I1 + P3 + P4, P2, I2, M3. Dental imaging enables visualization of the unerupted teeth and gives more information about the development of the teeth. The growth pattern of the teeth obtained through radiographic and computed tomographic examination provides basic data in the micropig as animal model for dental research.