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1. Performance Evaluation of C-RAN with Timing Offset | |||
LI Zhicheng,NIU Kai | |||
Information Science and System Science 11 September 2014 | |||
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Abstract:The capacity demand for mobile network has been growing very fast in recent years, which makes the mobile network operators exploring new mobile network structure based on cloud infrastructure, i.e. C-RAN. The C-RAN system makes centralized processing and large-scale cooperative transmission possible, and it may bring remarkable improvement on system performance. In this paper, a mode of inter-RRH timing offset (TO) is proposed to evaluate the C-RAN with timing alignment error (TAE). Results show that although C-RAN has a great potential on improving system performance, it can only get nearly half of the gain under TAE. To suppress the effect of TAE, the phase compensation beamforming is performed at RRH side using feedback information of UE side. The beamforming can offset the effect of phase shift caused by TAE. It is observed that the algorithm performs well and the system only suffers about 5%~10% performance loss compared with nearly 50% loss with no phase compensation. | |||
TO cite this article:LI Zhicheng,NIU Kai. Performance Evaluation of C-RAN with Timing Offset[OL].[11 September 2014] http://en.paper.edu.cn/en_releasepaper/content/4609493 |
2. Person Re-identification with Data-Driven Features | |||
Xiang Li, Jinyu Gao, Xiaobin Chang, Yuting Mai, Wei-Shi Zheng | |||
Information Science and System Science 08 September 2014 | |||
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Abstract:Human-specified appearance features are widely used for person re-identification at present, such as color and texture histograms. Often, thesefeatures are limited by the subjective appearance of pedestrians. This paper presents a new representation to re-identification that incorporates data-driven features to improve the reliability and robustness in person matching. Firstly, we utilize a deep learning network, namely PCA Network, to learn data-driven features from person images. The features mine more discriminative cues from pedestrian data and compensate the drawback of human-specified features. Then the data-driven features and common human-specified features are combined to produce a final representation of each image. The so-obtained enriched Data-driven Representation (eDR) has been validated through experiments on two person re-identification datasets, demonstrating that the proposed representation is effective for person matching. That is, the data-driven features facilitatemore accurate re-identification when they are fused together with the human-specified features. | |||
TO cite this article:Xiang Li, Jinyu Gao, Xiaobin Chang, et al. Person Re-identification with Data-Driven Features[OL].[ 8 September 2014] http://en.paper.edu.cn/en_releasepaper/content/4607551 |
3. A Similar Interaction Model for Group Activity Recognition in Still Images | |||
Xiaobin Chang, Xiang Li, Yuting Mai, Wei-Shi Zheng | |||
Information Science and System Science 03 September 2014 | |||
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Abstract:This paper addresses the group activity recognition in the still image. We formulate an alternative discriminant contextual model on feature level. On the one hand, it mines the person-joint-context feature model, which describes the interaction of a focal person and its surrounding context. In the meanwhile, the surrounding context is featured with the relative pose, relative location and the scene background. On the other hand, a similar interaction model is formed to learn the interactive correlation between a focal person and its surrounding context. An optimization criterion is proposed to learn the similar interaction model. We show that the optimization problem can be optimized efficiently. Our experimental results show that the proposed model outperforms related works, even though temporal information is not available. | |||
TO cite this article:Xiaobin Chang, Xiang Li, Yuting Mai, et al. A Similar Interaction Model for Group Activity Recognition in Still Images[OL].[ 3 September 2014] http://en.paper.edu.cn/en_releasepaper/content/4607561 |
4. Real-Time Payoff-Maximization for Aggregator in Dynamic Aggregator-PHEVs System | |||
CHEN Jie,YANG Bo,GUO Zhuoyu,CHEN Cailian,GUAN Xinping | |||
Information Science and System Science 15 July 2014 | |||
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Abstract:In recent years, more and more plug-in hybrid electric vehicles (PHEVs) have been put to use in smart grid. In this paper, we consider a dynamic aggregator-PHEVs system, where the aggregator convinces the PHEVs to use electricity rather than gas by setting an appropriate charging price dynamically. We propose a payoff-maximizing algorithm for the aggregator to decide not only the charging price but also the electricity amount purchased from real-time power market based on Lyapunov optimization. Furthermore, we transform the power purchase problem into the energy allocation problem among all the PHEVs. The proposed algorithm operates in real time and does not require any prior knowledge of the statistical information of the system. Theoretically, we demonstrate the proposed algorithm can guarantee network stability and achieve a result that is away from the optimum by O(1/V), where V is a control parameter. The effectiveness and robustness of the algorithm is validated through simulation results. | |||
TO cite this article:CHEN Jie,YANG Bo,GUO Zhuoyu, et al. Real-Time Payoff-Maximization for Aggregator in Dynamic Aggregator-PHEVs System[OL].[15 July 2014] http://en.paper.edu.cn/en_releasepaper/content/4601808 |
5. ESO-based Adaptive Robust Control of Dual Motor Driving Servo System | |||
Ren Xue-Mei,Sun Guo-Fa, Li Dong-Wu,Zhao Wei | |||
Information Science and System Science 24 June 2014 | |||
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Abstract:Based on extended state observer (ESO), we propose adaptive robust control (ARC) for dual motor driving servo system, in which there exist nonlinearities affecting control performance. First, backlash and friction phenomenon are analyzed in detail and nonlinear model of the plant is derived. Then, for the obtained nonlinear model of dual motor drive servo system with perturbation and disturbance, ESO is designed to estimate the lumped uncertainty online before designing ARC. Considering the estimated lumped disturbance signal, Lyapunov approach is employed to design adaptive law, which guarantees closed-loop stability and boundedness of all signals. Furthermore, transient performance of tracking behavior is guaranteed by initialization in the sense of $L_infty$ norm. Finally, extensive experimental results on a practical test rig validate the effectiveness of our proposed method. | |||
TO cite this article:Ren Xue-Mei,Sun Guo-Fa, Li Dong-Wu, et al. ESO-based Adaptive Robust Control of Dual Motor Driving Servo System[OL].[24 June 2014] http://en.paper.edu.cn/en_releasepaper/content/4601212 |
6. Global adaptive output feedback control of nonlinear time-delaysystems | |||
LIN Yan, ZHANG Xu | |||
Information Science and System Science 15 May 2014 | |||
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Abstract:We consider the problem of global output feedbackstabilization for a class of nonlinear time-delay systems. Comparedwith the previous works, the class of nonlinear time-delay systemsis greatly enlarged. Based on a dynamic gain scaling technique, anadaptive output feedback controller independent of the time-delay isexplicitly constructed. By introducing a new scaled Lyapunovfunction and employing the Lyapunov-Krasovskii method, it is provedthat global stabilization of the nonlinear time-delay systems can beachieved by the proposed scheme. | |||
TO cite this article:LIN Yan, ZHANG Xu. Global adaptive output feedback control of nonlinear time-delaysystems[OL].[15 May 2014] http://en.paper.edu.cn/en_releasepaper/content/4597121 |
7. Global Practical Tracking by Output-Feedback forNonlinear Systems with Unknown Growth Rate and Time-delay | |||
Xuehua Yan, Xinmin Song | |||
Information Science and System Science 14 May 2014 | |||
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Abstract:This paperconsiders the global practical tracking problem by output-feedback fora class of uncertain nonlinear systems with not only unmeasured states dependent growthbut also time-varying time delay.Compared with the closely related works, the remarkableness of the paper is that thetime-varying time delay and unmeasurable states are permitted in the system nonlinear growth. Motivated by therelated tracking results, and flexibly using the ideas and techniques of universal control anddead zone, an adaptive output-feedbacktracking controller is explicitly designed with the help of a new Lyapunov-Krasoviskii functional, to makethe tracking error prescribed arbitrarily small after a finite time while keep all the closed-loopsignals bounded. | |||
TO cite this article:Xuehua Yan, Xinmin Song. Global Practical Tracking by Output-Feedback forNonlinear Systems with Unknown Growth Rate and Time-delay[OL].[14 May 2014] http://en.paper.edu.cn/en_releasepaper/content/4597352 |
8. Dynamics Analysis in a Delayed Two-Species Competition Model with Harvest Effort and Nonlinear Intraspecific Regulation | |||
LIU Chao, WANG Xiao-Min, Yue Wen-Quan | |||
Information Science and System Science 08 May 2014 | |||
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Abstract:In this paper, a mathematical model is established to investigate interaction and coexistence mechanism of two-species competition ecosystem with nonlinear intraspecific regulation. The combined dynamic effects of maturation delay and harvest effort on population dynamics are discussed. Conditions for existence of three nonnegative boundary equilibria and a unique interior equilibrium are investigated. Positivity and boundedness of solutions are analytically studied. By analyzing associated characteristic equation, local stability of the proposed model around nonnegative boundary equilibrium and interior equilibrium is discussed, respectively. Furthermore, global stability of the nonnegative boundary equilibrium is investigated based on an iterative technique. By constructing an appropriate Lyapunov functional, global stability of the unique interior equilibrium is also discussed. Numerical simulations are carried out to show consistency with theoretical analysis. | |||
TO cite this article:LIU Chao, WANG Xiao-Min, Yue Wen-Quan. Dynamics Analysis in a Delayed Two-Species Competition Model with Harvest Effort and Nonlinear Intraspecific Regulation[OL].[ 8 May 2014] http://en.paper.edu.cn/en_releasepaper/content/4594689 |
9. Global Stability Analysis of a Nonautonomous Stage Structured Competitive System with Toxic Effect and Double Maturation Delays | |||
LIU Chao, LI Yuan-Ke | |||
Information Science and System Science 04 May 2014 | |||
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Abstract:In this paper, a nonautonomous stage structured two-species competitive system with toxic effect and double time delays is investigated due to maturation for two species, where toxic effect of toxin liberating species on nontoxic species is considered and theinhibiting effect is zero in absence of either species. Positivity and boundedness of solutions are analytically studied. By utilizing some comparison arguments, an iterative technique is proposed to discuss permanence of the species within competitive system. Furthermore, existence of positive periodic solutions is investigated based on continuation theorem of coincidence degree theory. By constructing an appropriate Lyapunov functional, sufficient conditions for global stability of the unique positive periodic solution are analyzed. Numerical simulations are carried out to show consistency with theoretical analysis. | |||
TO cite this article:LIU Chao, LI Yuan-Ke. Global Stability Analysis of a Nonautonomous Stage Structured Competitive System with Toxic Effect and Double Maturation Delays[J]. |
10. Multi-Leader Multi-Follower Game Based Power Control for Downlink Heterogeneous Networks | |||
HAN Qiaoni,Yang Bo,CHEN Cailian,GUAN Xinping | |||
Information Science and System Science 01 April 2014 | |||
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Abstract:Heterogeneous networks (HetNets) are expected to be an integral component of expansion of 3G and emerging 4G network deployments. However, in order to achieve the QoS requirements of all the users, interference mitigation techniques need to be developed to manage the radio resources of macrocells and small cells. In this paper, we focus on the optimal power allocation for downlink HetNets. Specifically, we take into account the different deployment targets and service requirements of macrocell base stations (BSs) and small cells (corresponding to picocells and femtocells), and classify them into two categories according to their deployment, namely, operator deployed BSs (OBSs) and customer deployed BSs (CBSs). Then, the framework of Stackelberg game with multiple leaders and multiple followers is adopted to investigate the downlink power allocation problem. To obtain the Stackelberg equilibrium (SE) distributively, we develop the power updating rules for both OBSs and CBSs. Moreover, the implementations of the proposed game are discussed. At last, numerical results show the convergence of the proposed game and the uniqueness of the SE. | |||
TO cite this article:HAN Qiaoni,Yang Bo,CHEN Cailian, et al. Multi-Leader Multi-Follower Game Based Power Control for Downlink Heterogeneous Networks[OL].[ 1 April 2014] http://en.paper.edu.cn/en_releasepaper/content/4592002 |
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