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857 results on '"Liu, Xiaozhen"'

4. How the experience of California wildfires shape Twitter climate change framings

Author

Ko, Jessie WY, Ni, Shengquan, Taylor, Alexander, Chen, Xiusi, Huang, Yicong, Kumar, Avinash, Alsudais, Sadeem, Wang, Zuozhi, Liu, Xiaozhen, Wang, Wei, Li, Chen, and Hopfer, Suellen

Subjects
Communication and Media Studies, Environmental Sciences, Language, Communication and Culture, Climate Action, Climate change, Climate change communication, Wildfire, Extreme weather events, Framing, Twitter, Engagement, Meteorology & Atmospheric Sciences
Abstract

Climate communication scientists search for effective message strategies to engage the ambivalent public in support of climate advocacy. The personal experience of wildfire is expected to render climate change impacts more concretely, pointing to a potential message strategy to engage the public. This study examined Twitter discourse related to climate change during the onset of 20 wildfires in California between the years 2017 and 2021. In this mixed method study, we analyzed tweets geographically and temporally proximal to the occurrence of wildfires to discover framings and examined how frequencies in climate framings changed before and after fires. Results identified three predominant climate framings: linking wildfire to climate change, suggesting climate actions, and attributing climate change to adversities besides wildfires. Mean tweet frequencies linking wildfire to climate change and attributing adversities increased significantly after the onset of fire. While suggesting climate action tweets also increased, the increase was not statistically significant. Temporal analysis of tweet frequencies for the three themes of tweets showed that discussion increased after the onset of a fire but persisted typically no more than 2 weeks. For fires that burned for longer periods of more than a month, external events triggered climate discussions. Our findings contribute to identifying how the personal experience of wildfire shapes Twitter discussion related to climate change, and how these framings change over time during wildfire events, leading to insights into critical time points after wildfire for implementing message strategies to increase public engagement on climate change impacts and policy.

Published
2024

15. How the Experience of California Wildfires Shapes Twitter Climate Change Framings

Author

Ko, Jessie WY, Ni, Shengquan, Taylor, Alexander K, Chen, Xiusi, Huang, Yicong, Kumar, Avinash, Alsudais, Sadeem, Wang, Zuozhi, Liu, Xiaozhen, Wang, Wei, Li, Chen, and Hopfer, Suellen

Subjects
Communication and Media Studies, Environmental Sciences, Language, Communication and Culture, Climate Action
Abstract

Abstract: Climate communication scientists search for effective message strategies to engage the ambivalent public in support of climate advocacy. The personal experience of wildfire is expected to render climate change impacts more concretely, pointing to a potential message strategy to engage the public. This study examined Twitter discourse related to climate change during the onset of 20 wildfires in California between years 2017-2021. We content analyzed tweets geographically and temporally proximal to the occurrence of wildfires to discover framings and examined how mean frequencies in climate framings changed before and after fires. Results identified three predominant climate framings: making explicit links between wildfire and climate change, suggesting climate actions, and attributing climate change to adversities besides wildfires. Mean tweet frequencies linking wildfire with climate change and attributing adversities increased significantly after the onset of fire while urging climate action tweets did not. Temporal analysis of tweet frequencies of tweets linking wildfires to climate change showed that discussion increased after the onset of a fire but persisted typically no more than one to two weeks. External real-world events happening simultaneously during wildfires also triggered climate discussions. Our findings contribute to identifying how the personal experience of wildfire shapes Twitter discussion related to climate change, and how these narratives change over time before and after wildfires, leading to insights into critical time points after wildfire for implementing message strategies to increase public engagement on climate change impacts and policy.

Published
2023

28. Improved Receivers for Optical Wireless OFDM: An Information Theoretic Perspective

Author

Liu, Xiaozhen, Zhou, Jing, Huang, Nuo, and Zhang, Wenyi

Subjects
Computer Science - Information Theory
Abstract

We consider performance enhancement of asymmetrically-clipped optical orthogonal frequency division multiplexing (ACO-OFDM) and related optical OFDM schemes, which are variations of OFDM in intensity-modulated optical wireless communications. Unlike most existing studies on specific designs of improved receivers, this paper investigates information theoretic limits of all possible receivers. For independent and identically distributed complex Gaussian inputs, we obtain an exact characterization of information rate of ACO-OFDM with improved receivers for all SNRs. It is proved that the high-SNR gain of improved receivers asymptotically achieve 1/4 bits per channel use, which is equivalent to 3 dB in electrical SNR or 1.5 dB in optical SNR; as the SNR decreases, the maximum achievable SNR gain of improved receivers decreases monotonically to a non-zero low-SNR limit, corresponding to an information rate gain of 36.3%. For practically used constellations, we derive an upper bound on the gain of improved receivers. Numerical results demonstrate that the upper bound can be approached to within 1 dB in optical SNR by combining existing improved receivers and coded modulation. We also show that our information theoretic analyses can be extended to Flip-OFDM and PAM-DMT. Our results imply that, for the considered schemes, improved receivers may reduce the gap to channel capacity significantly at low-to-moderate SNR., Comment: 15 pages, 17 figures.To appear in IEEE Transactions on Communications

Published
2022

45. All-trans retinoic acid enhances the cytotoxic effect of decitabine on myelodysplastic syndromes and acute myeloid leukaemia by activating the RARα-Nrf2 complex

Author

Wang, Lu, Zhang, Qi, Ye, Li, Ye, Xingnong, Yang, Wenli, Zhang, Hua, Zhou, Xinping, Ren, Yanling, Ma, Liya, Zhang, Xiang, Mei, Chen, Xu, Gaixiang, Li, Kongfei, Luo, Yingwan, Jiang, Lingxu, Lin, Peipei, Zhu, Shuanghong, Lang, Wei, Wang, Yuxia, Shen, Chuying, Han, Yueyuan, Liu, Xiaozhen, Yang, Haiyang, Lu, Chenxi, Sun, Jie, Jin, Jie, and Tong, Hongyan

Published
2023
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