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Zhang J.,Sun Yat Sen University | Long Y.,SYSU CMU Shunde International Joint Research Institute
IEEE Transactions on Antennas and Propagation | Year: 2014

A novel dual-layer electrically small radio-frequency-identification (RFID) tag antenna is proposed for metallic object applications. With a proximity-coupled feed method, two rotationally symmetric loaded via-patches are fed through an embedded dual-element planar inverted-F antenna (PIFA) array. With this configuration, the antenna volume is reduced to 0.08 λ × 0.04 λ × 0.007 λ while the measured antenna gain is 0.08 dBi at the frequency of 923 MHz. Studies demonstrate that the proposed antenna is a good candidate for ultra-high-frequency RFID tags to be mounted on metallic surfaces, especially in size-constrained scenarios. Meanwhile, a figure of merit, namely, NBG, is presented, with which a comparison among electrically small tag antennas is carried out. Finally, several guidelines are given out to facilitate the miniaturization of RFID tag antennas for metallic object applications. © 2014 IEEE.

Zhang J.,Sun Yat Sen University | Long Y.,SYSU CMU Shunde International Joint Research Institute
IEEE Antennas and Wireless Propagation Letters | Year: 2013

In this letter, a dual-layer radio frequency identification (RFID) tag antenna is proposed. By embedding a slotted via-patch in the middle layer, the proposed antenna is miniaturized to a total volume of 28×14×3.2 mm3. At the same time, the loaded via-patch makes the antenna input impedance be flexibly tuned in a large scale. Moreover, an equivalent circuit model is given out to explicate how this via-patch functions. The measured read ranges with and without a metallic plate were 1.8 and 2 m, respectively, which implies the proposed antenna is a good candidate in metallic object applications, especially in size-constrained scenarios. © 2002-2011 IEEE.

Li M.,Sun Yat Sen University | Li M.,SYSU CMU Shunde International Joint Research Institute
ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings | Year: 2015

This paper presents a generalized i-vector representation framework using the mixture of Gaussian (MoG) factor analysis for speaker verification. Conventionally, a single standard factor analysis is adopted to generate a low rank total variability subspace where the mean supervector is assumed to be Gaussian distributed. The energy that can't be represented by the low rank space is modeled by a single multivariate Gaussian. However, due to the sparsity of the frame level posterior probability and the short duration characteristics, some dimensions of the first-order statistics may not be Gaussian distributed. Therefore, we replace the single Gaussian with a mixture of Gaussians to better represent the residual energy. Experimental results on the NIST SRE 2010 condition 5 female task and the RSR 2015 part 1 female task show that the MoG i-vector outperforms the i-vector baseline by more than 10% relatively for both text independent and text dependent speaker verification tasks, respectively. © 2015 IEEE.

Lin L.,Sun Yat Sen University | Lin L.,SYSU CMU Shunde International Joint Research Institute | Zhang R.,Sun Yat Sen University | Duan X.,Sun Yat Sen University
IEEE Transactions on Circuits and Systems for Video Technology | Year: 2015

This paper investigates a general framework to discover categories of unlabeled scene images according to their appearances (i.e., textures and structures). We jointly solve the two coupled tasks in an unsupervised manner: 1) classifying images without predetermining the number of categories and 2) pursuing generative model for each category. In our method, each image is represented by two types of image descriptors that are effective to capture image appearances from different aspects. By treating each image as a graph vertex, we build up a graph and pose the image categorization as a graph partition process. Specifically, a partitioned subgraph can be regarded as a category of scenes and we define the probabilistic model of graph partition by accumulating the generative models of all separated categories. For efficient inference with the graph, we employ a stochastic cluster sampling algorithm, which is designed based on the Metropolis-Hasting mechanism. During the iterations of inference, the model of each category is analytically updated by a generative learning algorithm. In the experiments, our approach is validated on several challenging databases, and it outperforms other popular state-of-the-art methods. The implementation details and empirical analysis are presented as well. © 1991-2012 IEEE.

Xu Y.,Sun Yat Sen University | Xu Y.,SYSU CMU Shunde International Joint Research Institute | Zhang W.,Harbin Institute of Technology | Hug G.,Carnegie Mellon University | And 2 more authors.
IEEE Transactions on Smart Grid | Year: 2015

Energy storage systems (ESSs) are often proposed to support the frequency control in microgrid systems. Due to the intermittency of the renewable generation and constantly changing load demand, the charging/discharging of various ESSs in an autonomous microgrid needs to be properly coordinated to ensure the supply-demand balance. Recent research has discovered that the charging/discharging efficiency of ESSs has remarkable dependence on the charging/discharging rate and state-of-charge of the ESS. This paper proposes a distributed cooperative control strategy for coordinating the ESSs to maintain the supply-demand balance and minimize the total power loss associated with charging/discharging inefficiency. The effectiveness of the proposed approach is validated by simulation results. © 2010-2012 IEEE.

Guo D.,Sun Yat Sen University | Guo D.,SYSU CMU Shunde International Joint Research Institute | Zhang Y.,Sun Yat Sen University | Zhang Y.,SYSU CMU Shunde International Joint Research Institute
Applied Soft Computing Journal | Year: 2014

This paper presents and investigates the application of Zhang neural network (ZNN) activated by Li function to kinematic control of redundant robot manipulators via time-varying Jacobian matrix pseudoinversion. That is, by using Li activation function and by computing the time-varying pseudoinverse of the Jacobian matrix (of the robot manipulator), the resultant ZNN model is applied to redundant-manipulator kinematic control. Note that there are nine novelties and differences of ZNN from the conventional gradient neural network in the research methodology. More importantly, such a Li-function activated ZNN (LFAZNN) model has the property of finite-time convergence (showing its feasibility to redundant-manipulator kinematic control). Simulation results based on a four-link planar robot manipulator and a PA10 robot manipulator further demonstrate the effectiveness of the presented LFAZNN model, as well as show the LFAZNN application prospect. © 2014 Elsevier B.V.

Andrenko A.S.,SYSU CMU Shunde International Joint Research Institute
IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) | Year: 2015

This paper presents the design of UHF RFID read/write (R/W) antenna for the variety of smart shelf retail applications. Antenna operation is based on the EM coupling between the open-ended or shorted MS feed line and periodic planar metal strips of certain layout. The proposed antenna can be easily customized for the required volume of smart shelf RFID interrogation. Several antenna prototypes have been designed, produced and measured. The antenna performance has been evaluated in UHF RFID system for the simultaneous detection of arbitrary oriented tagged apparel items placed on the antenna surface. The proposed antenna demonstrates excellent ability to provide strong and uniform E-field distribution at the distances up to 50 cm form the antenna surface. © 2015 IEEE.

Andrenko A.S.,SYSU CMU Shunde International Joint Research Institute
Proceedings of the 2015 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications, IEEE APWC 2015 | Year: 2015

This paper presents the EM analysis and design of a frequency reconfigurable antenna for the mobile handset and wireless terminal applications. The proposed antenna has a simple planar layout and utilizes RF switches to provide the multiband frequency reconfigurable capabilities. Two designs are presented and their multimode antenna performances within the 0.8 to 2.45 GHz band are analyzed in terms of current density distributions and radiation characteristics. © 2015 IEEE.

Andrenko A.S.,SYSU CMU Shunde International Joint Research Institute
Progress in Electromagnetics Research Symposium | Year: 2015

This paper presents the EM simulation and accurate analysis of quasi-circular polarization (CP) of the so-called smart shelf antenna designed for the UHF RFID retail and item-tagging applications. The design of the proposed antenna is based on the EM coupling between the open-ended or shorted-to-the ground meander microstrip (MS) line utilizing the standing wave current-voltage distribution and periodic metal strips printed on the top surface of a dielectric substrate. It has been confirmed by the series of full-wave EM simulations that the proposed antenna creates strong near field within the entire volume where multiple RFID tags are placed. The required quasi-CP near field has been numerically optimized by utilizing the three-section layout of the periodic metal strips and changing the angles of strip sections so that it results in both Ex- and Ey-components being produced. The prototypes with different layouts of the proposed antenna have been produced and their performance in the UHF RFID system has been verified.

Andrenko A.S.,SYSU CMU Shunde International Joint Research Institute
International Conference on Mathematical Methods in Electromagnetic Theory, MMET | Year: 2016

The concept of quasi-circular polarization (CP) of the EM field produced in the near field by a planar RFID antenna is discussed. Optimized CP near field performance is obtained by shaping the layout of periodic EM coupled strips forming the antenna aperture. It is shown that the specifically designed planar antenna can simultaneously produce the right-hand circular polarization (RHCP) and left-hand circular polarization (LHCP) in the spatially different areas of the near field zone. The results of EM simulation illustrate the mechanism of producing the quasi-CP radiation in the antenna near field zone at different distances from the antenna surface. © 2016 IEEE.

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