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Yin C.,Hefei Electronic Engineering Institute | Hu M.,Branch Team 91
International Journal of Antennas and Propagation | Year: 2012

Firstly, a domain-division solution is provided in this paper, which can solve Hankel function's singular problem of Sommerfeld integral in calculating the spatial domain Green function for cylindrically stratified media and realize the computation for all elements of Z-matrix in the method of moment. Then, the arbitrary shape cylindrical conformal microstrip antenna (CCMA) fed by microstripline is theoretically analysed using the RWG basis function. Numerical results are presented in the form of mutual coupling between two current modes and electromagnetic characteristics of a CCMA fed by microstripline. The results show that, comparing with the planar counterpart microstrip antenna, the reflection coefficient of the CCMA increases, the current on the microstripline varies sharply, and the backward radiation field appears. However, the frontward radiation field of the CCMA is similar to the planar case. © 2012 Chengyou Yin and Mengzhong Hu.


Ouyang X.,Hefei Electronic Engineering Institute | Zeng F.,Hefei Electronic Engineering Institute
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2016

In high dynamic circumstances, the acquisition of BDS (BeiDou Navigation Satellite System) signal would be affected by the pseudo-code Doppler. The pseudo-code frequency shift is more prominent and complex when BOC modulation has been adopted by BDS-II, but is not yet involved in current compensation algorithm. In addition, the most frequently used code Doppler compensation algorithm is modifying the sampling rate or local bit rate, which not only increases the complexity of the acquisition and tracking, but also is barely realizable for the hardware receiver to modify the local frequency. Therefore, this paper proposes a code Doppler compensation method based on double estimator receiver, which simultaneously controls NCO delay of code tracking loop and subcarrier tracking loop to compensate for pseudo-code frequency shift. The simulation and test are implemented with BDS-II BOC signal. The test results demonstrate that the proposed algorithm can effectively compensate for pseudo-code Doppler of BOC signal and has detection probability 3dB higher than the uncompensated situation when the false alarm rate is under 0.01 and the coherent integration time is 1ms. © 2016 SPIE.


Wang S.-D.,Hefei Electronic Engineering Institute | Wang S.-D.,Hefei University of Technology | Zhou Y.-W.,South China University of Technology
Computers and Industrial Engineering | Year: 2010

This paper discusses production and order as well as advertising coordination issues in a single-manufacturer single-buyer supply chain, where the manufacturer sells a newsvendor-type product through the buyer who faces a random demand depending on advertising expenditure. Before the start of the selling period, the buyer needs to determine how much she should invest in advertising and how many units of products she should order from the manufacturer. By the end of the season, if the revealed demand exceeds stock on hand, the buyer has an opportunity to place a second order from manufacturer to meet part of the unfilled demand. The ordered items are produced by the manufacturer in two production modes for different requirements. Under such a setting, the centralized and decentralized decision models are developed respectively, and the closed form solution to each model is provided as well. An improved revenue-sharing contract is proposed to achieve the supply chain coordination. © 2010 Elsevier Ltd. All rights reserved.


Wang S.-D.,Hefei Electronic Engineering Institute | Wang S.-D.,Hefei University of Technology | Zhou Y.-W.,South China University of Technology | Wang J.-P.,Hefei University of Technology
International Journal of Systems Science | Year: 2010

This article discusses production and order as well as advertising coordination issues in a single-manufacturer single-buyer supply chain, where the manufacturer sells a newsvendor-type product through the buyer who faces a random demand depending on advertising expenditure and selling price. The buyer has two ordering opportunities: the one happens before the beginning of the season, and the other takes place at the end of the season. The ordered items are produced by the manufacturer in two production modes for different requirements. The first production mode is relatively cheap but requires a long lead-time, whereas the second is expensive but offers quick response. Under such a setting, the centralised and decentralised decision models are developed, respectively, and the closed form solution to each model is provided as well. Moreover, we point out that the traditional revenue-sharing contract fails to coordinate the supply chain. We thus propose an improved revenue-sharing contract that requests the manufacturer not only shares the buyer's revenue but also bears a portion of the buyer's operating costs. Such a contract can achieve perfect coordination of the supply chain and arbitrarily allocate its profit between two parties. © 2010 Taylor & Francis.


Huang Y.,Hefei Electronic Engineering Institute
Hejubian Yu Dengliziti Wuli/Nuclear Fusion and Plasma Physics | Year: 2015

The physical model of the plasma antenna with plasma-insulating tube-vacuum is established. Then the new dispersion relation is derived. Through the geometric interpretation, a new algorithm with high precision and fast convergence is presented. Simulation results verify the correctness and effectiveness of the conclusion. The dispersion relation of cylindrical plasma antenna is studied when the electron density decreases according to the linear law. And the radiation pattern is given. The results have important reference value in analysis and design of the plasma antenna. ©, 2015, The Editorial Board of Nuclear Fusion and Plasma Physics. All right reserved.


Wang S.-D.,Hefei University of Technology | Wang S.-D.,Hefei Electronic Engineering Institute | Zhou Y.-W.,South China University of Technology | Min J.,Anhui Institute of Architecture and Industry | Zhong Y.-G.,South China University of Technology
Computers and Industrial Engineering | Year: 2011

This paper considers cooperative advertising issues of a monopolistic manufacturer with competing duopolistic retailers. Four possible game structures (or power configurations), i.e., Stackelberg-Cournot, Stackelberg-Collusion, Nash-Cournot and Nash-Collusion, are discussed. Under each of four game structures, we develop a decision model for the three partners to design the optimal cooperative advertising policies. Through a comparison among the four models, we reveal how cooperative advertising policies and profits of all participants are affected by various competitive behaviors, and then determine whether the partners have any incentives to transit to a different structure. Also presented in the paper are a centralized decision model and a proposed cost-sharing contract, which is able to achieve perfect coordination of the considered channel, where the utility of risk preference is used to determine the fraction of local advertising costs shared by the manufacturer. © 2011 Elsevier Ltd. All rights reserved.


Yan X.,Hefei Electronic Engineering Institute | Lu Y.,Hefei Electronic Engineering Institute
Journal of Real-Time Image Processing | Year: 2016

In (k, n) visual secret sharing (VSS), a secret image is generated into n shadow images printed onto transparencies and distributed to n associated participants. The secret image can be recovered by stacking any k or more shadow images and human visual system without cryptographic computation. The previous VSS schemes neglected participants increasing. However, in some applications, some new shadow images need to be generated because some new participants join the secret sharing. In this paper, we consider the new participants increasing issue as well as propose a participants increasing method only from the n original shadow images generated by previous existed (k, n) threshold random grids-based visual secret sharing (RGVSS). Without knowing the original generation algorithm and the original secret image, q new shadow images can be obtained from the original n shadow images without reprinting the original ones, as a result (Formula presented.) threshold RGVSS will be gained. Theoretical analysis and experiments are conducted to evaluate the security and efficiency of the proposed scheme. © 2016 Springer-Verlag Berlin Heidelberg


Wu W.,Hefei Electronic Engineering Institute
Applied Mechanics and Materials | Year: 2012

The index system of communication EW equipment's Reliability can be qualitative and quantitative and multi-hierarchic.The method is used to evaluate communication EW equipment's Reliability, which combines EAHP and fuzzy synthetic evaluation. Examples indicate that the method is feasible. © (2012) Trans Tech Publications, Switzerland.


Chen X.,Hefei Electronic Engineering Institute | Xie M.,Hefei Electronic Engineering Institute
Lecture Notes in Electrical Engineering | Year: 2016

Cooperative communication is a promising technology to obtain diversity gain at terminals. According to the traditional amplify-and-forward (AF) scheme, relay node helps transmit source node’s information with fixed transmission power all the time. It is not optimal in view of power efficiency, especially when the channel state is good. This paper introduces the adaptive AF scheme based on the minus exponential effective-SNR mapping (EESM) model. The optimal power to relay is predicted accurately. The reliability requirement is satisfied, and the power is saved for transmitting new information. Theoretical analysis and simulation results indicate that the adaptive AF scheme improves the power efficiency significantly. © Springer India 2016.


Wang S.-D.,Hefei Electronic Engineering Institute | Wang S.-D.,Hefei University of Technology | Zhou Y.-W.,South China University of Technology | Wang J.-P.,Hefei University of Technology
International Journal of Production Economics | Year: 2010

This paper discusses production and order as well as advertising coordination issues for a single-manufacturer single-buyer supply chain. In the two-echelon system, the manufacturer sells a newsvendor-type product through the buyer who faces a random demand depending on advertising expenditure and selling price. Before the start of the selling period, the buyer needs to determine how much she should invest in advertising, how many units of products she should order from the manufacturer and at what price she should sell the ordered products. At the end of the selling period, when the revealed demand exceeds stock on hand, all the superfluous demand is met by a second order from the manufacturer, if unfilled customers are offered a discount in selling price. Based on the buyer's first order, the manufacturer needs to select his initial production quantity under a relatively cheap but long lead-time production mode, and responds to the buyer's second order with an expensive but quick-response production mode (if necessary). Under both the centralized and decentralized setting, we formulate mathematical models of how two members make their decisions, respectively, and provide the closed-form solution to each model. In order to achieve perfect coordination of the supply chain, we propose an improved sales rebate contract, which can arbitrarily allocate the profit between two parties. Finally, we implement a numerical study to illustrate the models. © 2010 Elsevier B.V. All rights reserved.

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