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Electrical Measurements of an AlGaN/GaN High-electron-mobility Transistor Structure Grown on Si
Zhi-Yao Zhang,Shun-Tsung Lo,Li-Hung Lin,Kuang Yao Chen,J. Z. Huang,Zhi-Hao Sun,C.-T. Liang,N. C. Chen,Chin-An Chang,P. H. Chang 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.9
We report on magnetotransport results for an Al<sub>0.15</sub>Ga<sub>0.85</sub>N/GaN high-electron-mobility-transistor structure grown on a p-type Si (111) substrate. Our results show that there exists an approximately temperature (<i>T</i>)-independent point, which could be ascribed to a direct transition from a weak insulator to a high Landau level filling factor quantum Hall state, exists in the longitudinal resistivity ρ<sub>xx</sub>. The Hall resistivity decreases with increasing <i>T</i>, compelling experimental evidence for electron-electron interaction effects in a weakly-disordered two-dimensional (2D) system. We find that electron-electron interaction effects can be estimated and eliminated, giving rise to a corrected nominally temperature-independent Hall slope. By fitting the low-field magnetotransport data to conventional 2D weak localization theory, we find that the dephasing rate 1/τ<sub>φ</sub> is proportional to <i>T</i>. Moreover, 1/τ<sub>φ</sub> is finite as <i>T</i> → 0, evidence for zero-temperature dephasing in our system.
Wei-Tsung Chuang,Rong-Hao Guo,Che-Min Chou,Chun-Chieh Wang,Ming-Jay Deng,Jhih-Min Lin,Chun-Yu Chen,Yao-Chang Lee 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
To meet future demands for cutting-edge wearable electronics, flexible supercapacitors must possess many features, such as eco-friendly processing, aesthetic appeal and no health hazards, in addition to have lightweight, robust and excellent cycling stability. We proposed a biomimetic and scalable method to fabricate an all-solid-state flexible supercapacitor (assFSC) using bioinspired clay/polymer nanocomposites as electrode materials and a gel electrolyte. Experimental results from X-ray techniques (tomography, scattering and diffraction) showed that the electrode’s structure features a 3D ant-nest-like framework composed of 2D nacre-like clay nanosheets, i.e. hierarchical layers-within-networks structure. Accordingly, the structural electrodes exhibit high tensile strength of 62 MPa, Young’s modulus of 4.4 GPa, and torsional strength of 165 MPa. Under a large operating potential of 4.0 V, the assFSC exhibited ultrahigh energy density (233.3 W h kg<SUP>-1</SUP> at 2 kW kg<SUP>-1</SUP>), ultrahigh power density (125 kW kg<SUP>-1</SUP> at 55.5 W h kg<SUP>-1</SUP>), and outstanding static cyclability (less than 10% loss after 5,000 cycles). We also performed a cycle-life test under dynamic deformation and demonstrated that the assFSC had charging and discharging abilities during motion, according to particle applications of wearable electronics. Thus stable and superior electrochemical performance can be attributed to the biomimetic layers-within-networks structure, which not only provided robust framework but also induced 3D conducting networks with increasing ion channels and shortening charge transports. The shapeable electrodes made by a molding process could, therefore, be used to meet the demands for fashionable, wearable electronics.
On The Way of Becoming Expert-SSU Student Journalist`s Self-Directed Learning
( Jie Yao Ma ),( Tsung Jen Shih ) 한국체육학회 2015 국제스포츠과학 학술대회 Vol.2015 No.1
Purpose: It is important to equip our students with the requisite skills they need to become professional. However, currently there is a discrepancy between what journalism education provides and what the industry needs. The crux of this problem lies in the missing of strategic procedural knowledge in journalism education. Upon realizing this hiatus in journalism education, the researcher develops this study, to examining the Self-Directed Leaning (SDL) mechanism adopted by the Student Sports Union (SSU). From the result of this study, the researcher gather already graduated SSU journalists` SDL experience, and to convert these tacit knowledge into documentation for future generations of young journalism graduates to refer to. Method: To discover extra knowledge regarding to SSU journalists` learning experience, and to understand their SDL process comprehensively, the researcher employed semi-structured in-depth interview in this study. The selection of interviewees focus on gradated SSUs` actual performance while they were in the organization, and their career performance after they graduated. Result: Through constantly accessing authentic sports events, SSU student journalists are better able to combine theory and practice together. The SDL journey allows students to proceduralize their knowledge from "knowing what" (declarative knowledge) to "knowing how" (procedural knowledge), and move towards the path of becoming expert. According to the result of the study, SSU`s SDL matches with Spear`s interactive model. This means (1). Opportunities people find in their own environments. (2). Past or new knowledge. And (3). Chance occurrences are three important elements for SSU journalists to form their SDL. Conclusion: To survive in the dynamic environment of journalism, it is important to provide students more practical trainings for them to bridge the gap between theory and practice. In this case, SDL is a useful method for students to gain the knowledge, skill and experience they need to become professional.
Yu-Lin Hsieh,Hsien-Tsung Yao,Ron-Shan Cheng,Meng-Tsan Chiang 한국식품영양과학회 2012 Journal of medicinal food Vol.15 No.5
Chitosan is a natural product derived from chitin. To investigate the hypoglycemic and anti-obesity effects of chitosan, male Sprague–Dawley rats were divided into four groups: normal control, diabetic, and diabetic fed 5% or 7%chitosan. Diabetes was induced in rats by injecting streptozotocin/nicotinamide. After 10 weeks of feeding, the elevated plasma glucose, tumor necrosis factor-a, and interleukin-6 and lower adiponetin levels caused by diabetes were effectively reversed by chitosan treatment. In addition, 7% chitosan feeding also elevated plasma glucagon-like peptide-1 levels and lowered the insulin resistance index (homeostasis model assessment) in diabetic rats. Lower adipocyte granular intensities and higher lipolysis rates in adipose tissues were noted in the 7% chitosan group. Moreover, chitosan feeding reduced hepatic triglyceride and cholesterol contents and increased hepatic peroxisomal proliferator-activated receptor a expression in diabetic rats. Our results indicate that long-term administration of chitosan may reduce insulin resistance through suppression of lipid accumulation in liver and adipose tissues and amelioration of chronic inflammation in diabetic rats.
Wang Li-Kai,Lin Yao-Tsung,Chen Jui-Tai,Lan Winnie,Hung Kuo-Chuan,Chen Jen-Yin,Liu Kuei-Jung,Yen Yu-Chun,Chou Yun-Yun,Cherng Yih-Giun,Tam Ka-Wai 대한마취통증의학회 2023 Korean Journal of Anesthesiology Vol.76 No.4
Background: Shared decision making using patient decision aids (PtDAs) was established over a decade ago, but few studies have evaluated its efficacy in Asian countries. We therefore evaluated the application of PtDAs in a decision conflict between two muscle relaxant reversal agents, neostigmine and sugammadex, and sequentially analyzed the regional differences and operating room turnover rates.Methods: This multicenter, outcome-assessor-blind, randomized controlled trial included 3,132 surgical patients from two medical centers admitted between March 2020 and August 2020. The patients were randomly divided into the classical and PtDA groups for pre-anesthesia consultations. Their clinicodemographic characteristics were analyzed to identify variables influencing the choice of reversal agent. On the day of the pre-anesthesia consultation, the patients completed the four SURE scale (sure of myself, understand information, risk-benefit ratio, encouragement) screening items. The operating turnover rates were also evaluated using anesthesia records. Results: Compared with the classical group, the PtDA group felt more confident about receiving sufficient medical information (P < 0.001), felt better informed about the advantages and disadvantages of the medications (P < 0.001), exhibited a superior understanding of the benefits and risks of their options (P < 0.001), and felt surer about their choice (P < 0.001). Moreover, the PtDA group had a significantly greater tendency to choose sugammadex over neostigmine (P < 0.001). Conclusions: PtDA interventions in pre-anesthesia consultations provided surgical patients with clear knowledge and better support. PtDAs should be made available in other medical fields to enhance shared clinical decision-making.
( Man Chin Hua ),( Hsun Chin Chao ),( Tsung Chieh Yao ),( Ming Wei Lai ),( Jing Long Huang ),( The Patch Study Group ) 대한소화기학회 2013 Gut and Liver Vol.7 No.4
Background/Aims: The aim of this study was to investigate whether genetic variations at positions -1082, -819, and 592 in the interleukin (IL)-10 promoter affect IL-10 production in children with irritable bowel syndrome (IBS). Methods: Ninety-four children with IBS and 102 children as healthy controls (HCs) were enrolled. Genomic DNA was extracted, and IL-10 -1082, -819, and -592 polymorphisms were detected by direct sequencing from all participants. Peripheral blood mononuclear cells (PBMCs) from 46 IBS children and 38 HCs were isolated and cultured with and without 5 ng/mL Escherichia coli lipopolysaccharide (LPS). IL-10 levels in the culture supernatants were measured by enzyme-linked immunosorbent assay. Results: There were no significant differences in the distribution of IL-10 -1082, -819, and -592 polymorphisms or in the allele and haplotype frequencies between IBS children and HCs. PBMCs from children with IBS had significantly lower IL-10 levels after LPS stimulation than PBMCs from HCs (p=0.011); however, LPS-induced IL-10 levels in PBMCs with different genotypes of -819 and 592 polymorphisms were not significantly different between IBS patients and HCs. Conclusions: Although significantly lower LPS-induced IL-10 production by PBMCs was noted, it is unlikely that IL-10 production was fully genetically determined in our IBS children. ClinicalTrials.gov identifier: NCT01131442. (Gut Liver 2013; 7:430-436)
Low Gate Leakage Current HFET Structure Fabricated by Using a Step-free Airbridge Gate Process
Feng-Tso Chien,Chien-Liang Chan,Chi-Ling Wang,Chien-Nan Liao,Yao-Tsung Tsai,Hsien-Chin Chiu 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.3
Conventional heterostructure field-effect transistors (HFETs) have a high gate leakage current due to the gate electrode being in contact with the exposed channel layer and with the carrier-providing layer on the mesa sidewall. In this study, we use a new step-free (SF) air-bridge gate structure to reduce the gate leakage and improve the breakdown voltage. The proposed structure does not increase any MASKs as compared with the conventional process. In addition, this new structure promises a gate-source capacitance smaller than those of conventional heterostructure FET devices. Consequently, the high-frequency performance of the HFETs using the proposed structure can be improved.