107 research outputs found
How We Express Ourselves Freely: Censorship, Self-censorship, and Anti-censorship on a Chinese Social Media
Censorship, anti-censorship, and self-censorship in an authoritarian regime
have been extensively studies, yet the relationship between these intertwined
factors is not well understood. In this paper, we report results of a
large-scale survey study (N = 526) with Sina Weibo users toward bridging this
research gap. Through descriptive statistics, correlation analysis, and
regression analysis, we uncover how users are being censored, how and why they
conduct self-censorship on different topics and in different scenarios (i.e.,
post, repost, and comment), and their various anti-censorship strategies. We
further identify the metrics of censorship and self-censorship, find the
influence factors, and construct a mediation model to measure their
relationship. Based on these findings, we discuss implications for democratic
social media design and future censorship research.Comment: iConference 2023 has accepte
Estimation of precipitable water from the thermal infrared hyperspectral data
Inst. Electr. Electron. Eng. Geosci.; Remote Sens. Soc. (IEEE GRSS)<span class="MedBlackText">Total precipitable water (TPW) is an important atmospheric parameter in many applications. A method was proposed to estimate TPW from thermal infrared hyperspectral data. First, 21 channel groups were selected to retrieve TPW. Then, two indices, namely, the difference- and the ratio-depth in each channel group, were used as the measurement of the water vapor absorption. By multivariate regression, the relationship between the TPW and the indices was established. Finally, this relationship was applied to the simulated thermal infrared hyperspectral data. Results showed that the root mean square error (RMSE) of the model is 0.102 g·cm<sup>-2</sup>, and the relative error is 8.1 %. The proposed method needs to be further refined in the future work, including the complete elimination of the Earth's emission in the retrieval. </span
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