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334 results on '"Chen, Chun-cheng"'

2. DyFormer: A Scalable Dynamic Graph Transformer with Provable Benefits on Generalization Ability

Author

Cong, Weilin, Wu, Yanhong, Tian, Yuandong, Gu, Mengting, Xia, Yinglong, Chen, Chun-cheng Jason, and Mahdavi, Mehrdad

Subjects
Computer Science - Machine Learning
Abstract

Transformers have achieved great success in several domains, including Natural Language Processing and Computer Vision. However, its application to real-world graphs is less explored, mainly due to its high computation cost and its poor generalizability caused by the lack of enough training data in the graph domain. To fill in this gap, we propose a scalable Transformer-like dynamic graph learning method named Dynamic Graph Transformer (DyFormer) with spatial-temporal encoding to effectively learn graph topology and capture implicit links. To achieve efficient and scalable training, we propose temporal-union graph structure and its associated subgraph-based node sampling strategy. To improve the generalization ability, we introduce two complementary self-supervised pre-training tasks and show that jointly optimizing the two pre-training tasks results in a smaller Bayesian error rate via an information-theoretic analysis. Extensive experiments on the real-world datasets illustrate that DyFormer achieves a consistent 1%-3% AUC gain (averaged over all time steps) compared with baselines on all benchmarks.

Published
2021

17. Boosting the Faradaic Efficiency of Br−‐Mediated Photoelectrochemical Epoxidation by Local Acidity on α‐Fe2O3.

Author

Duan, Meng‐Yu, Tang, Dao‐Jian, Yang, Jie, Yang, Si‐Peng, Deng, Chao‐Yuan, Zhao, Yu‐Kun, Li, Ji‐Kun, Zhang, Yu‐Chao, Chen, Chun‐Cheng, and Zhao, Jin‐Cai

Subjects
EPOXIDATION, STYRENE oxide, STYRENE derivatives, ACIDITY, OXIDATION of water, BRASSINOSTEROIDS, ELECTROLYTIC reduction
Abstract

The redox mediated photoelectrochemical (PEC) or electrochemical (EC) alkene oxidation process is a promising method to produce high value‐added epoxides. However, due to the competitive reaction of water oxidation and overoxidation of the mediator, the utilization of the electricity is far below the ideal value, where the loss of epoxidation's faradaic efficiency (FE) is ≈50%. In this study, a Br−/HOBr‐mediated method is developed to achieve a near‐quantitative selectivity and ≈100% FE of styrene oxide on α‐Fe2O3, in which low concentration of Br− as mediator and locally generated acidic micro‐environment work together to produce the higher active HOBr species. A variety of styrene derivatives are investigated with satisfied epoxidation performance. Based on the analysis of local pH‐dependent epoxidation FE and products distribution, the study further verified that HOBr serves as the true active mediator to generate the bromohydrin intermediate. It is believed that this strategy can greatly overcome the limitation of epoxidation FE to enable future industrial applications. [ABSTRACT FROM AUTHOR]

Published
2024
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18. Synergistic Effect of Polyethylene Glycol and Lactic Acid on Handling Properties and Antibacterial Efficacy of Premixed Calcium Silicate Cement.

Author

Huang, Yi-Huei, Wu, I-Ting, Chen, Chun-Cheng, and Ding, Shinn-Jyh

Subjects
LACTIC acid, ESCHERICHIA coli, POLYETHYLENE glycol, TREATMENT effectiveness, BONE cements
Abstract

Calcium silicate (CaSi) bone cement with antibacterial and osteogenic properties has attracted significant interest. However, there is a need to develop a variety of new premixed bone cement to meet the clinical requirements of fast setting time, ease of handling, and efficient antibacterial properties. In this study, different volume ratios of polyethylene glycol (PEG) and lactic acid liquids were added to calcium silicate, and the effects of varying liquid-to-powder ratios (L/P) were examined. This study assessed the physicochemical properties, cytotoxicity, and antibacterial activity against S. aureus and E. coli of this premixed cement. The results from the experiments indicated that lactic acid significantly reduced the setting time of the CaSi-based cement and enhanced its mechanical strength. Furthermore, the appropriate concentration of lactic acid and matching L/P ratio improved its washout resistance. The cell viability of all premixed cement was found to be over 80%. The premixed cement containing PEG and lactic acid exhibited superior antibacterial properties compared to the CaSi control. Based on its setting time, washout resistance, and antibacterial activity, a premixed cement with a liquid phase of 80% PEG and 20% lactic acid at an L/P ratio of 0.4 appeared promising for use in dental and orthopedic practice. [ABSTRACT FROM AUTHOR]

Published
2024
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21. Discussion on the Teaching and Learning Innovation of Higher-Order Thinking

Author

Chen, Chun-cheng, Wu, Ming-chang, Wu, Ting-ting, Hutchison, David, Series Editor, Kanade, Takeo, Series Editor, Kittler, Josef, Series Editor, Kleinberg, Jon M., Series Editor, Mattern, Friedemann, Series Editor, Mitchell, John C., Series Editor, Naor, Moni, Series Editor, Pandu Rangan, C., Series Editor, Steffen, Bernhard, Series Editor, Terzopoulos, Demetri, Series Editor, Tygar, Doug, Series Editor, Weikum, Gerhard, Series Editor, Wu, Ting-Ting, editor, Huang, Yueh-Min, editor, Shadiev, Rustam, editor, Lin, Lin, editor, and Starčič, Andreja Istenič, editor

Published
2018
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43. SARS-CoV-2 Continuous Genetic Divergence and Changes in Multiplex RT-PCR Detection Pattern on Positive Retesting Median 150 Days after Initial Infection

Author

Liu, Dakai, primary, Rodriguez, George D., additional, Zhou, Hang-Yu, additional, Cheng, Ye-Xiao, additional, Li, Xiaofeng, additional, Tang, Wenwen, additional, Prasad, Nishant, additional, Chen, Chun-Cheng, additional, Singh, Vishnu, additional, Konadu, Eric, additional, James, Keither K., additional, Bahamon, Maria F., additional, Chen, Yvonne, additional, Segal-Maurer, Sorana, additional, Wu, Aiping, additional, and Rodgers, William Harry, additional

Published
2022
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