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148 results on '"Zhang, Meiqing"'

5. Social Bots and Social Media Manipulation in 2020: The Year in Review

Author

Chang, Ho-Chun Herbert, Chen, Emily, Zhang, Meiqing, Muric, Goran, and Ferrara, Emilio

Subjects
Computer Science - Social and Information Networks, Computer Science - Computers and Society
Abstract

The year 2020 will be remembered for two events of global significance: the COVID-19 pandemic and 2020 U.S. Presidential Election. In this chapter, we summarize recent studies using large public Twitter data sets on these issues. We have three primary objectives. First, we delineate epistemological and practical considerations when combining the traditions of computational research and social science research. A sensible balance should be struck when the stakes are high between advancing social theory and concrete, timely reporting of ongoing events. We additionally comment on the computational challenges of gleaning insight from large amounts of social media data. Second, we characterize the role of social bots in social media manipulation around the discourse on the COVID-19 pandemic and 2020 U.S. Presidential Election. Third, we compare results from 2020 to prior years to note that, although bot accounts still contribute to the emergence of echo-chambers, there is a transition from state-sponsored campaigns to domestically emergent sources of distortion. Furthermore, issues of public health can be confounded by political orientation, especially from localized communities of actors who spread misinformation. We conclude that automation and social media manipulation pose issues to a healthy and democratic discourse, precisely because they distort representation of pluralism within the public sphere., Comment: Book Chapter submitted for the Handbook of Computational Social Science

Published
2021

8. Automated Analysis of Doppler Echocardiographic Videos as a Screening Tool for Valvular Heart Diseases

Author

Yang, Feifei, Chen, Xiaotian, Lin, Xixiang, Chen, Xu, Wang, Wenjun, Liu, Bohan, Li, Yao, Pu, Haitao, Zhang, Liwei, Huang, Dangsheng, Zhang, Meiqing, Li, Xin, Wang, Hui, Wang, Yueheng, Guo, Huayuan, Deng, Yujiao, Zhang, Lu, Zhong, Qin, Li, Zongren, Yu, Liheng, Duan, Yongjie, Zhang, Peifang, Wu, Zhenzhou, Burkhoff, Daniel, Wang, Qiushuang, and He, Kunlun

Published
2022
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18. Asymmetric ideological segregation in exposure to political news on Facebook

Author

González-Bailón, Sandra, primary, Lazer, David, additional, Barberá, Pablo, additional, Zhang, Meiqing, additional, Allcott, Hunt, additional, Brown, Taylor, additional, Crespo-Tenorio, Adriana, additional, Freelon, Deen, additional, Gentzkow, Matthew, additional, Guess, Andrew M., additional, Iyengar, Shanto, additional, Kim, Young Mie, additional, Malhotra, Neil, additional, Moehler, Devra, additional, Nyhan, Brendan, additional, Pan, Jennifer, additional, Rivera, Carlos Velasco, additional, Settle, Jaime, additional, Thorson, Emily, additional, Tromble, Rebekah, additional, Wilkins, Arjun, additional, Wojcieszak, Magdalena, additional, de Jonge, Chad Kiewiet, additional, Franco, Annie, additional, Mason, Winter, additional, Stroud, Natalie Jomini, additional, and Tucker, Joshua A., additional

Published
2023
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21. A Patch Aware Multiple Dictionary Framework for Demosaicing

Author

Zhang, Meiqing, Tao, Linmi, 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, Cremers, Daniel, editor, Reid, Ian, editor, Saito, Hideo, editor, and Yang, Ming-Hsuan, editor

Published
2015
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24. Dual Optimization of Bulk and Interface via the Synergistic Effect of Ligand Anchoring and Hole Transport Dopant Enables 23.28% Efficiency Inverted Perovskite Solar Cells

Author

Zhou, Xianyong, primary, Luan, Xiangfeng, additional, Zhang, Luozheng, additional, Hu, Hang, additional, Jiang, Zhengyan, additional, Li, Yaru, additional, Wu, Jiawen, additional, Liu, Yanliang, additional, Chen, Jiabang, additional, Wang, Deng, additional, Liu, Chang, additional, Chen, Shi, additional, Zhang, Yong, additional, Zhang, Meiqing, additional, Peng, Yuanjun, additional, Troshin, Pavel A., additional, Wang, Xingzhu, additional, Mai, Yiyong, additional, and Xu, Baomin, additional

Published
2023
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29. Integrated Ideal‐Bandgap Perovskite/Bulk‐Heterojunction Solar Cells with Efficiencies > 24%

Author

Zhou, Xianyong, primary, Zhang, Luozheng, additional, Yu, Jianwei, additional, Wang, Dong, additional, Liu, Chang, additional, Chen, Shi, additional, Li, Yaru, additional, Li, Yan, additional, Zhang, Meiqing, additional, Peng, Yuanjun, additional, Tian, Yanqing, additional, Huang, Jinsong, additional, Wang, Xingzhu, additional, Guo, Xugang, additional, and Xu, Baomin, additional

Published
2022
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47. Hydrophobic edible composite packaging membrane based on low-methoxyl pectin/chitosan: Effects of lotus leaf cutin

Author

Fei Peng, Jie Li, Shiyu Zheng, Fansen Zeng, Ye Yanqi, and Zhang Meiqing

Subjects
0106 biological sciences, Microbiology (medical), Absorption of water, food.ingredient, Polymers and Plastics, Pectin, Chemistry, 04 agricultural and veterinary sciences, Cutin, 040401 food science, 01 natural sciences, Biomaterials, Contact angle, Chitosan, chemistry.chemical_compound, 0404 agricultural biotechnology, Membrane, food, Chemical engineering, 010608 biotechnology, Thermal stability, Lotus effect, Safety, Risk, Reliability and Quality, Food Science
Abstract

In this study, cutin extracted from lotus leaf was incorporated with low-methoxy pectin and chitosan to prepare hydrophobic edible composite membranes. Results showed that the formation and microstructure of the membranes were affected by the addition of lotus leaf cutin, which filled the gap between chitosan and low-methoxyl pectin. This addition results in obvious changes in the composite packaging membranes and weakens crystal peaks. According to the contact angle measurement, the hydrophobicity of composite packaging membranes was enhanced by the addition of lotus leaf cutin increasing the contact angle from 61.8° to 90.3°. With the increased cutin addition from 0 g to 3 g, water absorption was significantly decreased from 48.83 % to 41.64 %, whilst water vapour permeability increased from 12.91 g/cm2·d to 16.18 g/cm2·d. Simultaneously, the tensile strength and fracture elongation were improved from 5.43 MPa and 95.6 % to 5.96 MPa and 128 %. The thermal stability of composite packaging membranes was also enhanced by the incorporation of lotus leaf cutin.

Published
2020

48. A general methodology for modeling loss given default

Author

Siddiqi, Nadeem A. and Zhang, Meiqing

Subjects
Default (Finance) -- Accounting and auditing, Default (Finance) -- Laws, regulations and rules, Government regulation, Banking, finance and accounting industries, Business
Abstract

Here's an LGD 'how to'--a step-by-step methodology for developing a reliable econometric model for Basel-compliant loss given default. Each step--defining LGD, converting raw data for use in standard regression techniques, [...]

Published
2004

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