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RISS 인기검색어
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- 저자 : ( Yingxian Zhang ) (검색결과 3 건)
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A Secure MQAM Scheme Based on Signal Constellation Hopping
( Yingxian Zhang ),( Aijun Liu ),( Xiaofei Pan ),( Zhan Ye ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.7
In this paper, a secure multilevel quadrature amplitude modulation (MQAM) scheme is proposed for the physical layer security (PLS) of the wireless communications. In the proposed scheme, each transmitted symbol`s signal constellation (SC) is hopping with the control of two unique factors: amplitude distortion (AD) factor and phase hopping (PH) factor. With unknown the two factors, the eavesdropper cannot extract effective information from the received signal. We first introduce a security metric, referred to as secrecy gain, and drive a lower bound on the gain that the secrecy capacity can be improved. Then, we investigate the relationship among the secrecy gain, the signal to noise power ratios (SNRs) of the main and wiretap channels, and the secrecy capacity. Next, we analyze the security of the proposed scheme, and the results indicate that the secrecy capacity is improved by our scheme. Specifically, a positive secrecy capacity is always obtained, whether the quality of the main channel is better than that of the wiretap channel or not. Finally, the numerical results are provided to prove the analytical work, which further suggests the security of the proposed scheme..
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CAN bus based current sharing control of high-power switching converters
Ye, Qiujin,Zeng, Min,Zhang, Yingxian,Wu, Kaiyuan The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.3
A digital current sharing control method leveraging a CAN bus is developed to inhibit the fluctuating current distributions of parallel converters in high-output oxidation power systems. When compared to conventional current sharing strategies, the proposed design significantly reduces circuit complexity without resorting to an analog current sharing bus, and is extremely robust in maintaining system functionality against one or multiple module failures. The digital control design also features anti-interference among high-power switching converters. In addition to detailing the operation principles and mathematical deductions of the state-space average model, the design of a current sharing controller and a current sharing scheme based on a CAN bus are presented to analyze the steady-state operation of parallel converters and dynamic-state operation. Based on these observations, a proof-of-concept prototype was developed that offers a maximum output power of nearly 400 kW with a current sharing error (CSE) below 2.1%. In addition, this system features outstanding anti-interference capability in intense electromagnetic fields.
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A conditioning circuit with exponential enhancement of output energy for triboelectric nanogenerator
Ghaffarinejad, Ali,Hasani, Javad Yavand,Hinchet, Ronan,Lu, Yingxian,Zhang, Hemin,Karami, Armine,Galayko, Dimitri,Kim, Sang-Woo,Basset, Philippe Elsevier 2018 Nano energy Vol.51 No.-
<P><B>Abstract</B></P> <P>Triboelectric-electret nanogenerators (T-ENG) are characterized by their high output voltage and small current and therefore a relatively low output power, making them limited to small power consuming electronics. Here we report a self-enhancing conditioning circuit (CC) that exponentially amplifies the output electrical energy converted from the mechanical domain of a T-ENG, in orders of magnitude compared to traditional CC. The circuit, working on the principles of Bennet’s doubler device, is inductorless and uses only diodes as automatic switches to reconfigure the charge storing capacitors between series and parallel modes. We previously reported this circuit in saturation and stable mode for T-ENG and compared the performances with half-wave rectifier. Here we investigate the circuit performance in exponential and unstable mode in comparison with half-wave and full-wave rectifiers. Theoretical analysis is presented to study the operation of the circuit and to find out the required conditions for the Bennet’s doubler to work in exponential boosting mode. Output performance of half and full wave rectifiers are compared theoretically. Simulations and experiments are performed to verify the theoretical discussions and to present the effect of non-ideal circuit elements on the output performance of the T-ENG.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We report a conditioning circuit (CC) for triboelectric-electret nanogenerators (T-ENG’s) based on the Bennet’s charge doubler. </LI> <LI> The proposed CC for the T-ENG employs only capacitors and diodes as automatic switching elements. </LI> <LI> A theoretical analysis of the Bennet’s doubler and its application for T-ENG is presented. </LI> <LI> Theoretical and experimental results indicate highly superior capability of the Bennet’s doubler compared to classical diode bridges. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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