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Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2016年 9712 LNCS卷 645-652页

作者： Zheng, Xiaohui Ning, Yi Chen, Xianjun Zhan, Yongsong Guangxi Colleges and Universities Key Laboratory of Intelligent Processing of Computer Image and Graphics Guilin University of Electronic Technology GuilinGuangxi541004 China Guangxi Experiment Center of Information Science Guilin University of Electronic Technology GuilinGuangxi541004 China Guangxi Colleges and Universities Key Laboratory of Cloud Computing and Complex Systems Guilin University of Electronic Technology GuilinGuangxi541004 China Guangxi Key Laboratory of Trusted Software Guilin University of Electronic Technology GuilinGuangxi541004 China

ISBN: (纸本)9783319409993

Surveillance video is characterized by large amount of data and redundancy, which makes the suspicious face detection to be a problem. To solve the problem above we proposed suspicious face detection based on key frame. Surveillance video has the type of fixed background, so this paper used the frame difference method with low computational complexity and small computation to extract the key frame. We proposed a new method combined DPM with skin color detection to detect the suspicious face in the key frames. To solve the speed bottleneck of the traditional DPM, we proposed to use the fast HOG LUT feature extraction and the near optimal cost sensitive decision making improving the traditional method. Meanwhile we used YCrCb + otsu skin color segmentation. Since the otsu is easily affected by the illumination, we proposed an improved skin color detection. Experiment results show that the proposed algorithms are robust and accurate for real-time. © Springer International Publishing Switzerland 2016.

关键词： Face recognition

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Multi-criteria Collaborative Filtering Based on Matrix Filling

Multi-criteria Collaborative Filtering Based on Matrix Filli...

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International Conference on Computer and Communications (ICCC)

作者： Li Ye Chunming Wu Baohua Qiang Wu Xie College of Computer & Information Science Southwest University Chongqing China Guangxi Key Laboratory of Cryptography and Information Security Guilin University of Electronic Technology Guilin China Guangxi Colleges and Universities Key Laboratory of Cloud Computing and Complex System Guilin University of Electronic Technology Guilin China

ISBN: (纸本)9781538683408

In multi-criteria collaborative filtering, the data sparsity is a critical factor affecting the effectiveness of the algorithm. Existing solutions generally remove low-efficiency data through dimensionality reduction, decomposition, etc. While at lower data dimension, they also lose original data information, which impacts the accuracy of predicted ratings. This paper adopts a new processing strategy and proposes to use the matrix filling method to handle the missing data. Firstly, an improved similarity algorithm combined with the Jaccard Similarity Coefficient is used to calculate the predicted rating. Secondly, the Reliable Factor is introduced to prevent the error of filling data. Finally, multiple linear regression is employed for aggregating the ratings of the criteria to eventually yield preferred predicted ratings. A series of experiments show that the proposed method can precisely reflect the user's similarity and achieve better results in predicted ratings, in contrast to traditional methods.

关键词： Filling Collaboration Filtering Reliability Prediction algorithms Linear regression Dimensionality reduction

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Generalized Anticipation Effect Models for Traffic Flow

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Journal of Applied Mathematics and Physics 2020年第3期8卷 367-374页

作者： Liuhua Zhu School of Physics and Telecommunication Engineering Yulin Normal University Yulin China Guangxi Colleges and Universities Key Laboratory of Complex System Optimization and Big Data Processing Yulin China

Taking into account the startup behaviour of following vehicles in the waiting area of urban traffic signal, we propose an extended Nagel-Schreckenberg model for single-lane traffic flow, in which the dynamic behavior of each vehicle depends on not only its own headway but also the headway of the immediately preceding one. The numerical simulation of the present model reproduces some complicated nonlinear phenomena observed in real traffic such as free flow, ghostly blockage, synchronized flow and so on. For specific parameter combinations the flow-density relation of this model shows two meta-stable branches near the transition density from free flow to wide moving traffic jam. Finally, the analytical results of the model under some specific parameters are given by using the mean field theory.

关键词： Traffic Flow Cellular Automaton Discrete Model Anticipation Effect Meta-Stable State

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Synchronization Dynamics in the Sakaguchi-Kuramoto Oscillator Network with Frequency Mismatch Rules

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Journal of Applied Mathematics and Physics 2020年第2期8卷 259-269页

The Sakaguchi-Kuramoto model is a modification of the well-known Kuramoto model, in which a frustration factor is added to the coupling term of each phase oscillator. The added frustration factor destroys the gradient structure, but the modified model is more widely used in practice. In this paper, we study how frustration factors influence the synchronization transition of coupled oscillators in the Sakaguchi-Kuramoto model with frequency mismatch rules. The results show that in the system of coupled oscillators, the frustration factor manifests a disorder field, which restrains the explosive synchronization and weakens the synchronization ability of the whole network. In addition, it is found that the frequency synchronization can not be detected by the common phase order parameter, so a new index is introduced to characterize the degree of frequency synchronization. As an example, at the end of the paper, we theoretically analyze the synchronization dynamics of two-oscillator system, and indirectly verify the correctness of simulations for the multi-body system.

关键词： Sakaguchi-Kuramoto Model Frustration Factors

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Criterion for the Emergence of Meta-Stable States in Traffic systems

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Journal of Applied Mathematics and Physics 2020年第6期8卷 976-982页

The measurements on actual traffic have revealed the existence of meta-stable states with high flow. Such nonlinear phenomena have not been observed in the classic Nagel-Schreckenberg traffic flow model. Here we just add a constraint to the classic model by introducing a velocity-dependent randomization. Two typical randomization strategies are adopted in this paper. It is shown that the Matthew effect is a necessary condition to induce traffic meta-stable states, thus shedding a light on the prerequisites for the emergence of hysteresis loop in the fundamental diagrams.

关键词： Traffic Flow Cellular Automaton Matthew Effect Hysteresis Loop Meta-Stable State

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Portrait image segmentation based on improved grabcut algorithm 6th

Portrait image segmentation based on improved grabcut algori...

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6th International Conference on Swarm Intelligence, ICSI 2015 held in conjunction with the 2nd BRICS Congress on Computational Intelligence, CCI 2015

作者： Li, Shuai Zheng, Xiaohui Chen, Xianjun Zhan, Yongsong Key Laboratory of Cloud Computing and Complex System Guilin University of Electronic Technology Guilin Guangxi541004 China Guangxi Experiment Center of Information Science Guilin University of Electronic Technology Guilin Guangxi541004 China Key Laboratory of Intelligent Processing of Computer Image and Graphics Guilin University of Electronic Technology Guilin Guangxi541004 China Guangxi Key Laboratory of Trusted Software Guilin University of Electronic Technology Guilin Guangxi541004 China Information Engineering School Haikou College of Economics Haikou Hainan571127

ISBN: (纸本)9783319204680

Traditional computer portrait caricature system mainly take the method that exaggerate and deform real images directly, that lead the facial image background also been deformed when exaggerate facial image. If in pretreatment stage, we segmented the characters and background of the input image, and then do the subsequent processing, the problem may be solved. But for better portrait caricature effects, we need an excellent segmentation algorithm. So, we propose an improved Grabcut image segmentation algorithm and use it to extract the prospect character image for exaggeration and deformation. In practical application, we separate deform and exaggerate the foreground characters image with TPS method, then fuse it with the original or new background picture, get the final image. Application proves, the method solves the background deformation problem well, and improves the quality and rate of image segmentation, caricature synthesis effect reality and natural. © Springer International Publishing Switzerland 2015.

关键词： Image segmentation

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A Spectral Efficient Hybrid Precoding Algorithm for MmWave MIMO systems

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Procedia Computer Science 2020年 174卷 584-590页

作者： Tingting Li Feng Zhao Key Laboratory of Cognitive Radio and Information Processing Guilin University of Electronic Technology Guilin 541004 China Guangxi Colleges and Universities Key Laboratory of Complex System Optimization and Big Data Processing Yulin Normal University Yulin China

Millimeter-wave MIMO will use hybrid precoding to improve the spectral efficiency. In this paper, we propose a spectral efficient hybrid precoding algorithm. In order to maximize the projection of hybrid precoding matrix on the optimal precoding matrix, we design the analog precoding matrix by selecting an optimal combination from the candidate matrix. Then, we regard the channel matrix and the obtained analog precoding matrix as an equivalent channel matrix, and use regularized zero-forcing to acquire the digital precoding matrix. Finally, we present simulation results of the proposed hybrid precoding algorithm and show that the algorithm approaches the optimal precoding.

关键词： Millimeter wave MIMO spectral efficiency hybrid precoding candidate matrix equivalent channel matrix

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Multicast routing with uncertain sources in software-defined network

Multicast routing with uncertain sources in software-defined...

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International Workshop on Quality of Service

作者： Zhiyao Hu Deke Guo Junjie Xie Bangbang Ren Science and Technology on Information Systems Engineering Laboratory National University of Defense Technology Changsha Hunan China Guangxi Colleges and Universities Key Laboratory of cloud computing and complex systems Guilin University of Electronic Technology Guilin China

Multicast is designed to jointly deliver content from a single source to a set of destinations. It can efficiently save the bandwidth consumption and reduce the load on the source. The appearance of SDN provides opportunities to deploy flexible protocols, including multicast and its variants. However, in many important applications, it is not necessary that the source of a multicast transfer has to be in specific location as long as certain constraints are satisfied. Such facts bring a novel multicast with uncertain sources, abbreviated as uncertain multicast. It brings new opportunities and challenges to reduce the bandwidth consumption. In this paper, we focus on the uncertain multicast and construct a forest with the minimum cost (MCF), to enable that each destination reaches to one and only one source. Prior approaches, relying on traditional multicast, remain inapplicable to the MCF problem. Therefore, we propose two (2+ε)-approximation methods, named P-MCF and E-MCF, which can be deployed in SDN controllers. We conduct experiments on our SDN testbed together with large-scale simulations under the random SDN network. All manifest that our MCF approach always occupies less network links and incurs less network cost for an uncertain multicast than the traditional Steiner minimum tree (SMT) of any related multicast, irrespective of the used network topology and the setting of multicast transmissions.

关键词： Bandwidth Vegetation Routing Approximation algorithms Algorithm design and analysis Network topology Technological innovation

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The parallelity of complex fuzzy sets and parallelity preserving operators

The parallelity of complex fuzzy sets and parallelity preser...

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作者： Bi, Lvqing Hu, Bo Li, Sizhao Dai, Songsong School of Electronics and Communication Engineering Guangxi Colleges and Universities Key Laboratory of Complex System Optimization and Big Data Processing Yulin Normal University Yulin China School of Information Science and Engineering Xiamen University Xiamen361005 China School of Mechanical and Electrical Engineering Guizhou Normal University Guiyang China

complex fuzzy sets have been successfully applied to many domains. In some applications, complex fuzzy operators play an vital role, especially those results depend on the particular choice of the conjunction, disjunction and complement operators. This paper introduces an equivalence relation on complex fuzzy sets, called parallelity. Then we provide a criterion that operators should satisfy the property of parallelity preserving, for the choices of complex fuzzy operators. Finally, several parallelity preserving inference methods are discussed for complex fuzzy reasoning. © 2018 - IOS Press and the authors. All rights reserved.

关键词： Fuzzy inference

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Broadband tri-polarization reconfigurable filtering antenna based on metasurface

Broadband tri-polarization reconfigurable filtering antenna ...

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IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP)

作者： Long Li Zhao Wu Jiajun Liang Guangxi Colleges and Universities Key Laboratory of Complex System Optimization and Big Data Processing Yulin Normal University Yulin P. R. China

A wideband tri-polarization reconfigurable metasurface (MTS) antenna with a filtering function is presented in this article. The proposed antenna consists of two layers, which are the coupled aperture layer and MTS layer. The antenna is excited by a microstrip printed on the bottom of the aperture layer, and the ground plane is fabricated on the top. A reconfigured coupled aperture achieved polarization diversity is etched on the ground plane. Additionally, the complementary split ring resonator (CSRR) is loaded on the ground plane and introduced a low-frequency radiated null. Six sets of PIN diodes are inserted on the microstrip and the reconfigured coupled aperture. By controlling the PIN diodes, polarization diversity is obtained, including linear polarization (LP), right-hand circular polarization (RHCP), and left-hand circular polarization (LHCP) modes. Besides, the MTS is manufactured on the top of the MTS layer. A high-frequency radiated null is realized by the non-uniform MTS. Thus, a polarization diversity with filtering performance antenna based on non-uniform is proposed. The simulated results show the antenna has a wide impedance bandwidth (IMBW) of 41.4% and 45.6% for LP and CP modes, respectively. While the antenna is operated in CP modes, an overlapped 3-dB axial ratio (AR) bandwidth reaches 16.2% for both CP modes. Meanwhile, the out-of-band radiation suppression level is more than 14.6 dB and 17 dB for LP and CP modes.

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