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您的检索式：作者名="Xingtong Zhang"
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| 1 | How do“gatekeepers”affect credit risk?显示文摘This study investigates the relationship between auditor tenure and credit default swap(CDS)spreads of U.S.firms based on quantile regression.After allowing for common determinants of CDS spreads,auditor tenure exerts both statistically and economically significant additional impacts on the CDS market.Furthermore,there are differential effects of common CDS spread determinants and auditor tenure.While common determinants of CDS spreads(e.g.,leverage,volatility,risk free rate,credit ratings,and earnings)have monotonically increasing impacts when CDS spreads(and their changes)are increasingly higher,auditor tenure primarily has the impact when CDS spreads are of low or median levels for less risky firms. | Xu Li Xingtong Zhang Yinggang Zhou | 2021 | Journal of Management Science and Engineering2021，6，3： | 1 |
| 2 | Security Analysis of Stochastic Routing Scheme in Grid-Shaped Partially-Trusted Relay Quantum Key Distribution Network显示文摘Quantum key distribution(QKD) technology provides proved unconditional security in pointto-point key transmissions based on quantum mechanics. However, several limitations, most prominently range,make it complex to construct large QKD network. The trusted relay QKD network is the most practical scene,and stochastic routing scheme was proposed to solve the fatal problem that some relay nodes may be controlled by adversary. But most results in stochastic routing scheme hinge on an adversary model without consideration of attacker's prior-knowledge and attack strategy. To reveal the security problem, we propose a new adversary model and apply it in grid-shaped partially-trusted relay QKD network. Then we analyze the best attack strategy and the impact on security under various situations respectively.Analysis and simulation results show that in some cases the security of stochastic routing scheme will be compromised, and a generalized upper bound for the overall safe probability is obtained. We also discuss how to alleviate the security problem, making the network more robust to attacks. | LIU Xingtong WANG Jian LI Ruilin ZHANG Chen | 2018 | Chinese Journal of Electronics2018，27，2： | 0 |
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