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  • MDPI AG  (2)
  • 1
    In: Sustainability, MDPI AG, Vol. 13, No. 22 ( 2021-11-13), p. 12557-
    Abstract: The literature on the link between corporate social responsibility (CSR) disclosure and stock price crash risk suggests that it is far more complicated than a plain one-to-one relationship. In this study, we examine how CSR disclosure affects the stock price crash risk and whether firm performance acts as a mediating variable in this relationship. The CSR disclosure index is built using the content analysis technique and the GRI criteria. We choose 225 businesses in Vietnam, comprising 159 firms listed on HOSE and 66 firms listed on HNX. Using the techniques of OLS, LOGIT, GMM, and the Sobel test and replacing different measures of dependent and mediator variable to enhance the robustness of our findings, we reach two important results. To begin with, CSR disclosure has a negative influence on the stock price crash risk of Vietnam’s listed firms. Second, in the aforementioned relationship, firm performance serves as an intermediate. Our results imply that listed firms should engage in CSR practices and disclosure in order to raise the firm’s performance and lower the stock price crash risk.
    Type of Medium: Online Resource
    ISSN: 2071-1050
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
    detail.hit.zdb_id: 2518383-7
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  • 2
    In: Entropy, MDPI AG, Vol. 21, No. 10 ( 2019-10-09), p. 982-
    Abstract: In this paper, we propose and evaluate the performance of fountain codes (FCs) based secure transmission protocols in multiple-input-multiple-output (MIMO) wireless systems, in presence of a passive eavesdropper. In the proposed protocols, a source selects its best antenna to transmit fountain encoded packets to a destination that employs selection combining (SC) or maximal ratio combing (MRC) to enhance reliability of the decoding. The transmission is terminated when the destination has a required number of the encoded packets to reconstruct the original data of the source. Similarly, the eavesdropper also has the ability to recover the source data if it can intercept a sufficient number of the encoded packets. To reduce the number of time slots used, the source can employ non-orthogonal multiple access (NOMA) to send two encoded packets to the destination at each time slot. For performance analysis, exact formulas of average number of time slots (TS) and intercept probability (IP) over Rayleigh fading channel are derived and then verified by Monte-Carlo simulations. The results presented that the protocol using NOMA not only reduces TS but also obtains lower IP at medium and high transmit signal-to-noise ratios (SNRs), as compared with the corresponding protocol without using NOMA.
    Type of Medium: Online Resource
    ISSN: 1099-4300
    Language: English
    Publisher: MDPI AG
    Publication Date: 2019
    detail.hit.zdb_id: 2014734-X
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