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176 results on '"Tsai, Wei-Che"'

2. Compositionally Complex Perovskite Oxides as a New Class of Li-Ion Solid Electrolytes

Author

Ko, Shu-Ting, Lee, Tom, Qi, Ji, Zhang, Dawei, Peng, Wei-Tao, Wang, Xin, Tsai, Wei-Che, Sun, Shikai, Wang, Zhaokun, Bowman, William J., Ong, Shyue Ping, Pan, Xiaoqing, and Luo, Jian

Subjects
Condensed Matter - Materials Science
Abstract

Compositionally complex ceramics (CCCs), including high-entropy ceramics (HECs) as a subclass, offer new opportunities of materials discovery beyond the traditional methodology of searching new stoichiometric compounds. Herein, we establish new strategies of tailoring CCCs via a seamless combination of (1) non-equimolar compositional designs and (2) controlling microstructures and interfaces. Using oxide solid electrolytes for all-solid-state batteries as an exemplar, we validate these new strategies via discovering a new class of compositionally complex perovskite oxides (CCPOs) to show the possibility of improving ionic conductivities beyond the limit of conventional doping. As an example (amongst the 28 CCPOs examined), we demonstrate that the ionic conductivity can be improved by >60% in (Li0.375Sr0.4375)(Ta0.375Nb0.375Zr0.125Hf0.125)O3-{\delta}, in comparison with the state-of-art (Li0.375Sr0.4375)(Ta0.75Zr0.25)O3-{\delta} (LSTZ) baseline, via maintaining comparable electrochemical stability. Furthermore, the ionic conductivity can be improved by another >70% via grain boundary (GB) engineering, achieving >270% of the LSTZ baseline. This work suggests transformative new strategies for designing and tailoring HECs and CCCs, thereby opening a new window for discovering materials for energy storage and many other applications.

Published
2022

21. The Best Strategy for the Black Hole Phenomenon between Intravascular Ultrasound and Optical Coherence Tomography.

Author

Kan, Cheng-Cheng, Tsai, Wei-Che, Cheng, Cheng-Chung, and Jong, Gwo-Ping

Subjects
*INTRAVASCULAR ultrasonography, *OPTICAL coherence tomography, *BLACK holes
Abstract

The black hole (BH) phenomenon is an intraluminal restenotic lesion. It was identified by intravascular ultrasound (IVUS) and optical coherence tomography (OCT) after intracoronary brachytherapy and drug-eluting stent implantation. Despite the similarity in the mode of action of brachytherapy and drug-eluting stent implantation, the BH phenomenon appears to be uncommon after drug-eluting stent implantation. Specifically, the BH phenomenon is better identified by OCT than by IVUS. Herein, we present a case of in-stent restenosis with suspected BH phenomenon on IVUS and confirmed by OCT. [ABSTRACT FROM AUTHOR]

Published
2024
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39. US macroeconomic surprises and the emerging‐market sovereign CDS market.

Author

Chiu, Junmao, Tsai, Wei‐Che, and Yin, Chi

Subjects
CREDIT default swaps, EMERGING markets, FUTURES market
Abstract

Our primary aim is to examine whether US macroeconomic surprises affect the slope of the term structure of 'sovereign credit default swap' (SCDS) spreads in emerging markets. Our empirical results show that positive (negative) US macroeconomic surprises are likely to reduce (increase) the term structure slope of SCDS spreads in emerging countries. We find that the slope values in emerging markets are positively related to future market returns over 1‐ and 2‐day horizons. Our results provide general support for the future informational role played by SCDS spreads for the national stock market within emerging markets. [ABSTRACT FROM AUTHOR]

Published
2023
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42. Profiles of Hospitalized Patients with Angiographic Coronary Heart Disease in Taiwan during 2014-2016: Report of a Tertiary Hospital

Author

Lin, Wen-Yu, Hung, Yuan, Lin, Gen-Min, Lin, Chin-Sheng, Liou, Jun-Ting, Cheng, Cheng-Chung, Tsai, Tsung-Neng, Tsai, Wei-Che, Lin, Tzu-Chiao, Liu, Wen-Cheng, Liu, Pang-Yen, Wu, Keng-Yi, Hsu, Chih-Hsueng, Yu, Fang-Han, Cheng, Shu-Meng, Yang, Shih-Ping, Lin, Wei-Shiang, and Wu, Chun-Hsien

Subjects
Original Article, cardiovascular diseases
Abstract

BACKGROUND: The Taiwan Society of Cardiology (TSOC) has established multicenter registries for coronary artery disease (CAD) to investigate clinical characteristics, management and risks for mortality. However, the impacts of newly-emerged evidence-based therapies, including the use of drug-eluting stents (DESs), on patients with CAD in Taiwan remain unclear. METHODS: The Tri-Service General Hospital–Coronary Heart Disease (TSGH-CHD) registry is a single-center, prospective, longitudinal registry in Taiwan containing data from 2014-2016. Individuals who were admitted for coronary angiography were enrolled. Patient profiles, management and in-hospital outcome data were collected. RESULTS: We included 3352 patients: 2349 with stable angina and 1003 with acute coronary syndrome (ACS). In the stable angina group, both patients receiving stenting and those receiving medical treatment had a 0.7% mortality rate; DESs were used in 70.4% of the patients receiving stenting. In the ACS group, the patients receiving stenting and those receiving medical treatment had a 4.9% and 10.7% mortality rate, respectively; DESs were used in 63.1% of the patients receiving stenting. In the 2008-2010 Taiwan ACS registry, DESs were used in only 28% of all stenting procedures, and the estimated hospital mortality rate was 1.8%. Multivariate analysis indicated that older age, prior stroke, and cardiogenic shock on admission were associated with an increased risk of in-hospital mortality in the ACS group. CONCLUSIONS: Compared with the Taiwan ACS cohort, the TSGH-CHD registry revealed increased DES use and increased disease complexity and severity after 2010. Although unlikely to significantly improve survival, interventionists seemed to perform high-risk procedures for complex CAD more often in the new DES era.

Published
2021

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