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International Conference on Computer and Information Technology (CIT)

作者： Zilei Wang Hongsheng Xi Guo Wei Key Laboratory of Network Communication System and Control Chinese Academy of Sciences University of Science and Technology Hefei Anhui China Department of Electronic Engineering and Information Science USTC Hefei Anhui China

Constant rate transmission and transport (CRTT) is an effective bandwidth smoothing scheme resulting in one fixed rate during the whole duration of variable bit-rate video, which, however, needs a large client buffer size. The minimum buffer requirement (MBR) of CRTT, besides benefiting the design of some piecewise transmission scheme, can examine whether we can transmit the requested video with a constant rate for a given buffer size. In this paper, we formulate off-line bandwidth smoothing into a binary classification problem of the underflow and overflow points. Then we propose a novel algorithm based on support vector machine because of its equal margin, which,we have proven, is able to minimize the required buffer size of CRTT. Our algorithm, therefore, can exactly calculate MBR together with the CRTT transmission rate without exhaustively searching buffer sizes and startup delay. The simulation results using some real MPEG4 and H.264 video show the philosophy and effectiveness of our algorithm.

关键词： Support vector machines Smoothing methods Bandwidth Support vector machine classification Streaming media Video compression Computer networks Delay MPEG 4 Standard Buffer storage

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Fuzzy approximation adaptive control of quadruped robots with kinematics and dynamics uncertainties

Fuzzy approximation adaptive control of quadruped robots wit...

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IEEE International Conference on Fuzzy systems (FUZZ-IEEE)

作者： Zhijun Li Shengtao Xiao Shuzhi Sam Ge The Key Lab of Autonomous System and Network Control South China University of Technology Guangzhou China Electrical & Computer Engineering Department National University of Singapore Singapore

This paper investigates optimal feet forces distribution and control of quadruped robots with uncertainties in both kinematics and dynamics. First, a constrained dynamics of quadruped robots is established. The distribution of required forces and moments on the supporting legs of a quadruped robot can be formulated as a problem for minimizing an objective function subject to form-closure constraints and balance constraints of external force. The dynamics of recurrent neural network for realtime force optimization are proposed. For the obtained optimized tip-point force and the motion of legs, we propose the hybrid motion/force control based on adaptive fuzzy system to compensate for the external perturbation and the task-space tracking errors in the environment. The proposed control can confront the uncertainties including approximation task space error and external perturbation. The verification of the proposed control is conducted using the extensive simulations.

关键词： Force Legged locomotion Dynamics Vectors Friction Jacobian matrices

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Implementation and test of human-operated and human-like adaptive impedance controls on Baxter robot

Implementation and test of human-operated and human-like ada...

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15th Annual Conference on Advances in Autonomous Robotics systems, TAROS 2014

作者： Liang, Peidong Yang, Chenguang Wang, Ning Li, Zhijun Li, Ruifeng Burdet, Etienne Centre for Robotics and Neural Systems School of Computing and Mathematics Plymouth University United Kingdom MOE Key Lab. of Autonomous System and Network Control College of Automation Science and Engineering South China University of Technology China State Key Laboratory of Robotics and System Harbin Institute of Technology China Department of Computer Science and Engineering Chinese University of Hong Kong Hong Kong Department of Bioengineering Imperial College of Science Technology and Medicine London United Kingdom

ISBN: (纸本)9783319104003

This paper presents an improved method to teleoperate impedance of a robot based on surface electromyography (EMG) and test it experimentally. Based on a linear mapping between EMG amplitude and stiffness, an incremental stiffness extraction method is developed, which uses instantaneous amplitude identified from EMG in a high frequency band, compensating for non-linear residual error in the linear mapping and preventing muscle fatigue from affecting the control. Experiments on one joint of the Baxter robot are carried out to test the approach in a disturbance attenuation task, and to compare it with automatic human-like impedance adaptation. The experimental results demonstrate that the new human operated impedance method is successful at attenuating disturbance, and results similarly to as automatic disturbance attenuation, thus demonstrating its efficiency. © 2014 Springer International Publishing.

关键词： Stiffness

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Resource Mobility Aware Hybrid Task Planning in Space Information networks

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Journal of communications and Information networks 2019年第4期4卷 107-116页

作者： Runzi Liu Yiting Zhu Yan Zhang Weihua Wu Di Zhou Kai Chi School of Information and Control Engineering Xi’an University of Architecture and TechnologyXi’anShaanxi 710055China The State Key Lab of ISN Xidian UniversityXi’anShaanxi 710071China Science and Technology on Communication Networks Laboratory CETC the 54th research instituteShijiazhuangHebei 050081China Electric Information Network Laboratory CETC the 20th research instituteXi’anShaanxi 710068China

In this paper,a resource mobility aware two-stage hybrid task planning algorithm is proposed to reduce the resource conflict between emergency tasks and the common tasks,so as to improve the overall performance of space information ***,in the common task planning stage,a resource fragment avoidance task planning algorithm is proposed,which reduces the contention between emergency tasks and the planned common tasks in the next stage by avoiding the generation of resource *** emergency tasks,we design a metric to quantify the revenue of the candidate resource combination of emergency tasks,which considers both the priority of the tasks and the impact on the planned common *** on this,a resource mobility aware emergency task planning algorithm is proposed,which strikes a good balance between improving the sum priority and avoiding disturbing the planned common ***,simulation results show that the proposed algorithm is superior to the existing algorithms in both the sum task priority and the task completion rate.

关键词： space information network task planning resource mobility

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An approach on a balance for a small humanoid robot by using movable mass 6th

An approach on a balance for a small humanoid robot by using...

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6th International Conference on Advanced Engineering Theory and Applications, AETA 2019

作者： Nguyen, Xuan Tien Nguyen, Huy Hung Nguyen, Trong Hai Nguyen, Tan Tien Nguyen, Thanh Phuong Faculty of Electric and Electronic Communication Engineering Sai Gon University Ho Chi Minh City Viet Nam Key Lab of Digital Control and System Engineering University of Technology VNU-HCM Ho Chi Minh City Viet Nam Faculty of Mechanical and Electrical Electronic HUTECH Ho Chi Minh City Viet Nam

ISBN: (纸本)9783030530204

In this paper, an approach on a balance for a small humanoid robot by using movable mass. A standard humanoid robot can stand stably when its center of mass (CoM) is in a zero moment point (ZMP) zone. However, CoM’s robot can go out the ZMP zone when the robot moves. To overcome this issues, a movable mass is added in the robot at the abdomen to balance. By controlling position of the movable mass, CoM’s robot can be kept in the ZMP zone when it moves. Simulation results show effectiveness of the proposed method. © Springer Nature Switzerland AG 2021.

关键词： Anthropomorphic robots

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A parallel HEVC encoder scheme based on Multi-core platform

A parallel HEVC encoder scheme based on Multi-core platform

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2015 4th National Conference on Electrical,Electronics and Computer Engineering(NCEECE 2015)

作者： Shu Jun Hu Dong Education Ministry’s Key Lab of Broadband Wireless Communication and Sensor Network Technology Education Ministry’s Engineering Research Center of Ubiquitous Network and Health Service System Jiangsu Province’s Key Lab of Image Procession and Image Communications Nanjing University of Post and Telecommunications

ISBN: (纸本)9781510819085

In this paper, we propose a parallel HEVC encoder scheme based on multi-core platform, which provides maximized parallel scalability by exploiting two-level parallelism, namely, the frame level parallelism and the CTB level parallelism. Inspired by the intra-CTB row level parallelism of WPP in HEVC, we investigate the inter-frame CTB prediction dependency to its reference CTBs, and find the inter-CTB correlation. Using this inter-correlation, we divide a frame into CTB units and create CTB-row level coding threads when their corresponding reference CTBs are available. Each thread is bonded to a processing core, therefore, both intra- and inter-CTB rows can be encoded in parallel. Moreover, we introduce a priority scheduling mechanism to control the coding threads. Experiments on Tilera-Gx36 multi-core platform show that, compared with serial execution, the proposed method achieves 3.6 and 4.3 times speedup for 1080 P and 720 P video sequences, respectively.

关键词： HEVC multi-core platform parallel processing frame-level CTB-level

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A Fast Sparsity Adaptive Matching Pursuit Algorithm for Compressed Sensing

A Fast Sparsity Adaptive Matching Pursuit Algorithm for Comp...

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The 2011 International Conference on Automation and Robotics(ICAR 2011)

作者： Chun-hui Ma Chun-yun Xu Lei Shen Shi-lian Zheng Telecommunication School Hangzhou Dianzi University State Key Lab of Information Control Technology in Communication System of No.36 Research Institute China Electronic Technology Corporation

Sparsity adaptive matching pursuit algorithm(SAMP) is a compressed sensing signal reconstruction algorithm with good performance. However, as the support set expands one time, the backward pursuit should be processed for many times, in which redundant update calculations are included. To solve the problem, this paper presents a fast sparsity adaptive matching pursuit algorithm(FSAMP). During the operation of the FSAMP, the backward pursuit is performed only once when the support set expands. After the support set is fixed, the backward pursuit shall be executed for multi times to guarantee the reconstruction precision. Simulation results for signal reconstruction show that the FSAMP has the slight higher reconstruction precision and the much faster reconstruction speed compared with the SAMP.

关键词： compressed sensing subspace pursuit sparsity adaptive matching pursuit image processing

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A novel method based on order statistics for extracting fingerprint of narrow band emitter

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Dianzi Yu Xinxi Xuebao/Journal of Electronics and Information Technology 2011年第5期33卷 1224-1228页

作者： Tang, Zhi-Ling Yang, Xiao-Niu Li, Jian-Dong School of Communication Engineering Xidian University Xi'an 710071 China School of Electronic Engineering and Automation Guilin University of Electronic Technology Guilin 541004 China National Key Lab of Information Control Technology for Communications System Jiaxing 314001 China

The static nonlinear feature of narrow band Radio Frequency Power Amplifier (RF PA) is made as the fingerprint of wireless communication emitter. RF PA with unknown input can be looked as a static nonlinear Hammerstein model. The process of feature extraction from this model is split into two steps. The first step is signal samples whitening and the second is the estimation of Taylor series' coefficients. The order statistics of the whitening signal samples is monotone. Then the features are estimated through linear regression using least square method. Comparing feature vectors of 4 RF power amplifiers results in that the proposed algorithm is effectively to identification different type of RF power amplifiers.

关键词： Power amplifiers

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Software Defined Multi-OLT Passive Optical network For Flexible Traffic Allocation

Software Defined Multi-OLT Passive Optical Network For Flexi...

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International Symposium on Optoelectronic Technology and Application 2016(OTA 2016)——Conf.15 Optical communication and Optical network

作者： SHIZONG Zhang RENTAO Gu YUEFENG Ji JIAWEI Zhang HUI Li Beijing Key Laboratory of Network System Architecture and Convergence School of Information and Communication EngineeringBeijing University of Posts and Telecommunications State Key Lab of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications

With the rapid growth of 4G mobile network and vehicular network services,mobile terminal users have increasing demand on data sharing among different radio remote units(RRUs) and roadside units(RSUs)

ISBN: (纸本)9781510607743

关键词： Passive optical network Software defined networking Bandwidth optimization Passive optical networks access network wavelengths Traffic core network control surfaces Building construction ARCHITECTURE bandwidth on demand Bandwidth

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Research on two-dimensional feature fusion algorithm of multi-sensors in wireless sensor networks

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Journal of Information and Computational Science 2011年第15期8卷 3647-3657页

作者： Bao, Bisai Wu, Jianrong Lou, Xiaojun Liu, Haitao Key Lab. of Wireless Sensor Network and Communication Shanghai Institute of Micro-System and Information Technology Chinese Academy of Science Shanghai 200050 China Wuxi SensingNet Industrialization Research Institute Wuxi 214135 China

Information fusion is an effective way to solve the problem of the limited of energy and bandwidth for wireless sensor networks, a novel strategy of two-dimensional feature fusion is proposed in this paper. The feature vectors of multi-sensors are first combined into a two-dimensional feature vector matrix. Then Two-Dimensional Principal Component Analysis is generalized for feature extraction from two-dimensional feature vector matrix to achieve multi-sensors feature fusion. The experimental results on the real signals of ground targets indicate that the dimension of fusion features is effectively reduced and the classification accuracy is increased significantly under two-dimensional feature fusion. They also demonstrate that two-dimensional feature fusion is more effective than the traditional feature fusion. © 2009 by Binary Information Press.

关键词： Wireless sensor networks

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