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Zhengzhou, China

Cheng Z.,Zheng Zhou University | Jiao L.,Zheng Zhou University
Lecture Notes in Electrical Engineering | Year: 2012

Based on the brief introduction of the port-controlled Hamiltonian (PCH) system, the PCH system model of non-salient permanent magnet linear synchronous motor is established. The control laws are presented in load known conditions. Simulation results show that the method of port-controlled Hamiltonian is easy to be realized to control permanent magnet linear synchronous motor (PMLSM) and the physical meaning is clear and the effect is ideal. © 2012 Springer-Verlag London Limited. Source


Wang K.-F.,Zheng Zhou University | Zhang Z.-H.,Zheng Zhou University
2010 International Conference on Future Information Technology and Management Engineering, FITME 2010 | Year: 2010

This paper introduces the design and implementation of a safe Public Key Infrastructure based on Transport Layer Security. Through the establishment of safe connection between each part of the PKI system, it can effectively resist the attack from the internal department. But the use of safe connection increases burden to inquiring certificate. To improve the efficiency of the certificate inquiring, we use OpenLdap server as the certificate distribution system in the premise of not reducing safety performance. © 2010 IEEE. Source


Song B.,Zheng Zhou University | Zhang Z.-H.,Zheng Zhou University
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

It is easy to be detected by X2 and RS steganalysis with high accuracy that using LSB algorithm to hide information in digital image. We started by selecting information embedded location and modifying the information embedded method, combined with sub-affine transformation and matrix coding method, improved the LSB algorithm and a new LSB algorithm was proposed. Experimental results show that the improved one can resist the X2 and RS steganalysis effectively. © 2013 SPIE. Source


Niu L.,Zheng Zhou University | Zhou J.-J.,Zheng Zhou University
Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics | Year: 2015

Considering the conjugate heat transfer, we optimized the operating parameters of louver fin heat exchanger with the 3-D numerical analysis software. Finally we got the optimal operating parameters, with higher Nu number and lower f coefficient, which are the entrance velocity of 3.5 m/s, the inlet temperature of 303.12 K and the flat tube temperature of 336.14 K. At the point, the resistance factor f is 0.61353, Nu number is 46.46. Comparing with the original working condition, the resistance factor f reduces 17.73% and Nu number increases 31.05%. © 2015, Science Press. All right reserved. Source


Chen E.,Zheng Zhou University | Chu C.,Zheng Zhou University
Eurasip Journal on Wireless Communications and Networking | Year: 2014

Single-carrier frequency domain equalization (SC-FDE) has been shown to be an attractive transmission scheme for broadband wireless channels. However, its performance would degrade a lot if the channel is fast time-varying. In this paper, we analyzed the single-carrier fractional Fourier domain equalization (SC-FrFDE) system and applied it to the fast timevarying channel. It can solve the time-varying problem by selecting the optimal fractional Fourier transform order. To this SC-FrFDE system, its transmitter uses chirp-periodic circular prefix to eliminate ISI and this has an evident disadvantage that the receiver need to feedback the optimal fractional Fourier transform order to the transmitter through a feedback channel. To simplify the system, we propose to use zero padding (ZP) at the transmitter. There is already the overlap-add method as ZP in SC-FDE system. But the overlap-add method cannot be used in fast time-varying channels. Thus, we propose a new method as ZP. Simulation results show that our proposed method can significantly improve the system performance. © 2014 Chen and Chu. Source

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