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Improved H.264 GOP-level bit allocation by incremental PID algorithm

Improved H.264 GOP-level bit allocation by incremental PID a...

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2007 IET Conference on Wireless, Mobile and Sensor Networks (CCWMSN07)

作者： Liquan Shen Zhaoyang Zhang Ying Li Zhi Liu Key Lab. of Advanced Display and System Application Ministry of Education Shanghai Univ. 200072 China School of Computer Engineering and Science Shanghai University Shanghai China

Since the current rate control schemes in H.264 do not present the capability of efficient GOP-level bit allocation, the video quality varies greatly for sequences with the scene change or the scene complexity varying from one GOP to another. To overcome the limitation, we propose a novel rate control scheme based on incremental PID algorithm. The incremental PID algorithm is introduced to minimize video quality variations in GOP-level bit allocation. Extensive simulation results show that the proposed rate control scheme, without expensive computational complexity added, decreases the average video quality variations by 15.07%.

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Design of intelligent capabilities in SDN

Design of intelligent capabilities in SDN

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International Conference on Wireless Communication, Vehicular Technology, Information Theory and Aerospace and Electronic systems Technology (Wireless VITAE)

作者： Hongyan Cui Yabo Zhu Yuan Yao Li Yufeng Yunjie Liu State Key Lab. of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing P. R. China Beijing Key Lab. of Network System Architecture and Convergence Information Engineering University of the People's Liberation Army Zhenzhou P. R. China

Software-Defined Networking (SDN) is an innovative and programmable networking architecture, representing the direction of the future network evolution. In this paper, we propose an architecture to introduce traffic classification techniques into the OpenFlow-based SDN network, which enables the network to be application-aware, so the network could distinguish various applications flows and know the requirements of different flows. Our new architecture also take advantage of the new intelligence to make the network forward traffic flows based flows' demands on bandwidth and delay, which could improve Quality of Service (QoS) of applications and optimize resource allocation all over the network.

关键词： Switches Quality of service Ports (computers) Protocols Bandwidth computer architecture

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Chaos characteristics analysis of transient signals for phase-locked synthesizer based FHC system

Chaos characteristics analysis of transient signals for phas...

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International Symposium on Communications and Information Technologies (ISCIT)

作者： Li Ping Wang Guohong Xiaopeng Yan Gong Peng Wenbo Shi Song Chunyun Beijing Institute of Technology National Key Lab. of Mechatronic Engineering and Control Beijing China Northeastern University School of Computer and Communication Engineering Qinhuangdao China National Lab. of Information Control Technology for Communication System Jiaxing Zhejiang China

ISBN: (纸本)9781479944156

Frequency synthesizer plays an important role in frequency hopping communication system. In this paper, we derivate the conditions for a system to become the chaotic based on the phase model of phase-locked synthesizer. We found that the system parameter changing during the frequency switching is able to make the system to be chaotic. Based on the Cao's method [5], we find that the fractal dimension of the transient signals should be equal to or less than 4, which also provides the maximal positive Lyapunov exponent. In addition, the unique double-ring attractor of them is also reproduced through the phase reconstruction, which also implies that the frequency switching will result in a chaotic for Frequency-Hopping Communication system.

关键词： Chaotic communication Switches Fractals Estimation Variable speed drives

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Efficient Parallelization of a Protein Sequence Comparison Algorithm on Manycore architecture

Efficient Parallelization of a Protein Sequence Comparison A...

引用

IEEE International Conference on Parallel and Distributed Computing, Applications and Technologies (PDCAT)

作者： Xiaochun Ye Van Hoa Nguyen Dominique Lavenier Dongrui Fan Chinese Academy of Sciences Beijing China Key Lab of Computer System and Architecture Institute of Computing Technology Chinese Academy and Sciences Beijing China CNRS IRISA/INRIA Rennes France

This paper introduces the Godson-T manycore architecture and demonstrates the efficiency of its synchronization mechanism through a computation intensive bioinformatics application: the comparison of protein banks. The parallel part of the protein sequence comparison algorithm can nearly get a linear speed-up thanks to a fine tuning of the synchronization mechanism provided by the Godson-T chip.

关键词： Protein sequence Bioinformatics computer architecture Genomics Databases Tiles computer displays Scanning probe microscopy Distributed computing Application software

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WiFi band-stop FSS for increased privacy protection in smart building

WiFi band-stop FSS for increased privacy protection in smart...

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International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications (MAPE)

作者： Xiong Xiong Weijun Hong Zhentao Zhao Li Deng Shufang Li College of Electronic and Information Engineering South China University of Technology Guangzhou China Beijing Key Lab. of Network System Architecture and Convergence Beijing Univ. of Posts and Telecommunications Beijing China

ISBN: (纸本)9781467374422

This paper proposes a periodic double ring strip frequency selective surface (FSS) with dual-band stop behavior. The FSS elements are designed to be etched on the transparent coating of glass substrate in smart buildings, which acts as a dual-band notch filter on 2.45GHz and 5.4GHz to avoid the leakage of WiFi signal outside the building. All the simulation parts are simulated by using High Frequency Structure Simulator (HFSS). The proposed FSS possesses 450MHz and 960MHz bandwidth with insertion loss more than -10dB around the two central operating frequencies 2.45GHz and 5.45GHz, respectively. Furthermore, the unit-cell structure provides a stable performance for both TE and TM polarizations with incident angles 0°-60°. A prototype of the proposed FSS is fabricated and measured. Good agreement between the simulated and measured results is obtained.

关键词： Frequency selective surfaces Convergence Communication system security Wireless communication Prototypes

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Robust Beamforming Based on Covariance Matrix Reconstruction and ADMM

Robust Beamforming Based on Covariance Matrix Reconstruction...

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2021 CIE International Conference on Radar, Radar 2021

作者： Gong, Pengcheng Wang, Zhaobin Xu, Kaiyan School of Information and Communication Engineering University of Electronic Science and Technology of China Chengdu611731 China School of Computer Science and Engineering Wuhan Institute of Technology Wuhan430205 China Hubei University of Technology Hubei Key Lab. for High-efficiency Utiliz. of Solar Ener. and Oper. Control of Energy Storage System Wuhan430068 China

ISBN: (纸本)9781665498142

Considering at the issue that the performance of the traditional beamforming algorithm will decrease sharply when the disturbance occurs at the disturbed position and the steering vector mismatch occurs, a new robust beamforming method based on covariance matrix reconstruction and Alternating Direction Method of Multipliers (ADMM) is proposed. Firstly, based on the maximum output power criterion of beamformers, an optimization model is designed to solve the optimal steering vector. Then, the covariance matrix is reconstructed by using the defined interference range to widen the nullity and enhance the anti-motion interference ability of the system. Then, for the quadratic inequality constraint problem of the steering vector, this paper uses ADMM to solve the model iteratively, and obtains the specific solution of the steering vector in each iteration. In addition, the complexity of the algorithm is also analyzed. The experimental results show that, compared with the existing beamforming algorithms, the proposed method Widen the width of zero notch in the interference area, improves the anti-interference performance of the beam, and can well correct the mismatched steering vector. © 2021 IEEE.

关键词： Alternating Direction Method of Multipliers Beamforming Covariance matrix reconstruction Null widening Quadratic constraint

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Unleashing the performance potential of CPU-GPU platforms for the 3D atmospheric Euler solver

Unleashing the performance potential of CPU-GPU platforms fo...

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International Conference on Application Specific systems (ASAP), architectures and Processors

作者： Haohuan Fu Jingheng Xu Lin Gan Chao Yang Wei Xue Wenlai Zhao Wen Shi Xinliang Wang Guangwen Yang National Supercomputing Center in Wuxi Ministry of Education Key Lab. for Earth System Modeling Center for Earth System Science Tsinghua University Department of Computer Science & Technology Tsinghua University Institute of Software and State Key Laboratory of Computer Science Chinese Academy of Sciences Tsinghua University Beijing Beijing CN

ISBN: (纸本)9781509015047

As a traditional application on various supercomputers, atmospheric modeling has long been suffering from the low performance efficiency. In this paper, we pick the 3D Euler equation solver (the most essential dynamic component for a non-hydrostatic atmospheric model) as the target application, and explore the maximum performance efficiency that can be achieved on CPU-GPU hybrid architectures. Besides presenting the suitable hybrid domain decomposition methodology and taking proper usage of tuning techniques for both the CPU and GPU parts, we further propose a novel GPU tuning technique, namely the customizable data caching mechanism with thread warp rescheduling scheme, which is specifically designed for the Euler solver. Combining all the optimizing approaches together, remarkable performance boost has been achieved on mainstream GPU architectures including Tesla Fermi C2050, K20×, K40 and K80. Especially, on the latest Tesla K80, we demonstrate a 31.64× speedup over the performance of 12-core E5-2697 CPU. In addition, based on a hybrid CPU-GPU node with two 12-core E5-2697 CPUs and two Tesla K80 GPUs, a sustained double-precision performance of 1.04 Tflops (16% of the peak) is achieved, which is remarkably higher than the efficiency of similar optimizing tasks based on heterogeneous platforms (strictly less than 10%, as demonstrated in the related work). In addition, a nearly linear weak scaling efficiency is achieved which demonstrate the effectiveness of our domain decomposition method.

关键词： Atmospheric modeling Graphics processing units Mathematical model Computational modeling computer architecture Tuning Three-dimensional displays

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NiuEM: A Nested-iterative Unsupervised Learning Model for Single-particle Cryo-EM Image Processing

NiuEM: A Nested-iterative Unsupervised Learning Model for Si...

引用

2020 IEEE International Conference on Bioinformatics and Biomedicine, BIBM 2020

作者： Hu, Rui Cai, Jiaming Zheng, Wangjie Yang, Yang Shen, Hong-Bin Shanghai Jiao Tong University Key Lab. of Shanghai Education Commission for Intelligent Interaction and Cognitive Engineering Department of Computer Science and Engineering Shanghai200240 China Institute of Image Processing and Pattern Recognition Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai200240 China Shanghai Jiao Tong University Department of Bioinformatics and Biostatistics Shanghai200240 China

ISBN: (纸本)9781728162157

Cryo-electron microscopy (cryo-EM) has become a mainstream technology for solving spatial structures of biomacromolecules, while the processing of cryo-EM images is a very challenging task. One of the great challenges is the high noise in the images. A common method is to cluster the images with close projecting angles to get mean images, which are used for 3D reconstruction. However, due to the extremely low signal-to-noise-ratio, common clustering methods often fail to obtain high-quality mean images, leading to poorly reconstructed structures. In this study, we present a new unsupervised learning framework, called NiuEM, to discriminate images captured from different angles and yield cluster-mean images. NiuEM first generates pseudo-lab.ls and then exploits both contrastive loss and cross-entropy loss for training convolutional layers to learn feature representations. Moreover, the pseudo-lab.ls are updated iteratively to enhance the reliability of lab.ls. We assess the performance of NiuEM on four data sets via both visualized and quantitative experiments. Especially, two kinds of metrics are adopted to measure the performance, regarding the clustering quality and the resolution of reconstructed 3D models, respectively. The experimental results show that NiuEM achieves very competitive clustering accuracy in the comparison with the state-of-the-art image clustering methods. Moreover, the cluster mean images yielded by NiuEM lead to better initial 3D models compared with the mainstream reconstruction tools. © 2020 IEEE.

关键词： Image reconstruction

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Optimal ramped-gate soft programming of over-erased flash EEPROM cells at given current

Optimal ramped-gate soft programming of over-erased flash EE...

引用

2004 7th International Conference on Solid-State and Integrated Circuits Technology Proceedings, ICSICT 2004

作者： Quan, Wu-Yun Baek, Chang-Ki Kim, Dae M. Gang, Ruan Huang, Yiping ASIC and System State-Key Research Lab. Department of Microelectronics Fudan University 220 Handan-road 200433 Shanghai China School of Electrical Engineering and Computer Science ISRC Seoul National University Kwanak P.O. Box 34 Seoul 151-744 Korea Republic of Korea Institute for Advanced Study 207-43 Cheongryangri Seoul Korea Republic of

Presented herein is an efficient simulation technique enabling systematic investigation of the soft programming over-erased flash EEPROM cells. The simulation provides a method by which to find the optimal soft programming technique for given current. The method requires only the cell performance data and allows investigation of the soft programming under various bias conditions. In principle, the methodology can also be used to investigate the programming and erase operations. © 2004 IEEE.

关键词： Flash memory

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Performance optimization of Jacobi stencil algorithms based on POWER8 architecture

Performance optimization of Jacobi stencil algorithms based ...

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International Conference on Application Specific systems (ASAP), architectures and Processors

作者： Jingheng Xu Haohuan Fu Lin Gan Yu Song Hongbo Peng Wen Shi Guangwen Yang Department of Computer Science & Technology Tsinghua University National Supercomputer Center at Wuxi Ministry of Education Key Lab. for Earth System Modeling Tsinghua University IBM China Systems and Technology Laboratory

In this paper we choose the widely used Jacobi stencil algorithm as our target program to evaluate the effectiveness of tuning techniques based on the latest POWER8 processor, thus to provide optimization guidelines t... 详细信息

ISBN: (纸本)9781509015047

关键词： Optimization Jacobian matrices Hardware Instruction sets Tuning computer architecture Software performance

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