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International Conference on Semantics, Knowledge and Grid (SKG)

作者： Zhixiang Li Liang He Yanjie Chu National Key Laboratory of Science and Technology on Blind Signal Processing Chengdu China

Multiobjective evolutionary algorithms based on decomposition (MOEA/D) decomposes a multiobjective optimization problem (MOP) into a number of scalar optimization subproblems, and solves each subproblem in a collaborative manner. For a MOP, different subproblems often have different difficulty to be approximated, especially when the MOP is extremely complex or has a discontinuous optimal front. This paper proposes a weight vector adaptation strategy for this issue, which changes the weight vectors and optimizes their computational resource allocation to fit the MOP. The experimental results on a variety of MOP test instances show that the proposed algorithm is competitive in comparison with three state-of-the-art decomposition multiobjective evolutionary algorithms.

关键词： Sociology Statistics Optimization Evolutionary computation Algorithm design and analysis Resource management signal processing algorithms

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Research on Improvement of Code Phase Synchronization Accuracy in GPS Spoofing

Research on Improvement of Code Phase Synchronization Accura...

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IEEE Information technology and Mechatronics Engineering Conference (ITOEC)

作者： Shuming Yi Xian Li Ling You National Key Laboratory of Science and Technology on Blind Signal Processing Chengdu China

ISBN: (数字)9781728143231

ISBN: (纸本)9781728143248

GPS (global positioning system) signals are direct-sequence spread-spectrum signals. The receiver relies on locally reproduced pseudo-random codes to keep tracking and dispreading the navigation signals. Due to the correlation characteristics of pseudo-random codes, scholars generally believe that only two identical signals that are separated by half a chip error have correlation, which brings high time synchronization accuracy requirements to GPS spoofing technology. In this paper, the research and analysis of the principle of the GPS receiver are carried out. It is found that the GPS spoofing technology can achieve a signal time synchronization error of 1.5 chips and proposed that the correlation peak loss due to chip error can be compensated by the transmit power in the meantime. The detailed theoretical derivation proof is given in the article. Finally, simulation experiments are performed to obtain the minimum spoofing power. The results show that under this error condition, GPS spoofing can be effectively implemented.

关键词： Correlation Tracking loops Receivers Global Positioning System Synchronization Low pass filters Generators

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A Tor Anonymity Attack Experiment Platform Driven by Raspberry Pi

A Tor Anonymity Attack Experiment Platform Driven by Raspber...

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Prognostics and System Health Management (PHM-Jinan), International Conference on

作者： Qi Wang Weiquan Cao National Key Laboratory of Science and Technology on Blind Signal Processing Chengdu China

ISBN: (数字)9781728151816

ISBN: (纸本)9781728151823

Private Tor network is essential for analyzing security issues both for Tor project as well as for numerous researchers. However, current research work mainly focus on improving scalability and efficiency by simulating traffic discretely with single node and restoration level by deploying a complete private network with high cost. In this paper, we propose a novel methodology constructing real private tor network by editing and controlling Raspberry Pis, called Tor anonymity attack experiment platform. Compared with other platforms of the same type, the platform has the advantages of low cost, easy to scale, high quality of real-time data transmission, high degree of network protocol restoration as well as convenient configuration. In order to demonstrate the platform can be used as a private and complete Tor anonymous network experiment environment, we conduct a source tracing attack as a study case. Experimental results and theoretical analysis both show that the platform can support researchers to carry out numerous Tor network security research with high degree of restoration efficiently and cheaply.

关键词： Servers Economic indicators Protocols Software Emulation Operating systems Virtual machining

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Reconstruct LDPC codes in a noisy environment

Reconstruct LDPC codes in a noisy environment

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IEEE International Conference on Progress in Informatics and Computing (PIC)

作者： Xin Bao Yuanling Huang Guiliang Wang National Key Laboratory of Science and Technology on Blind Signal Processing Chengdu China

Focus on the problem of reconstructing LDPC codes in a noisy environment, an algorithm based on Column Elimination Operation, Parity-Check Vector Judgment Criterion and Gradual Row Transformation is proposed, which is used to blind recognize LDPC codes. This algorithm first gets enough dual vectors of the receive codes, then selects real parity-check vectors of the dual-space of LDPC codes, and then, detectives and deletes the error code words. The above steps are iteratively carried out until the original problem is reduced to an easier problem, i.e., blind recognition LDPC codes in an error-free context, and finally obtain the sparse parity-check matrix by using Gradual Row Transformation. The simulation and experiment results show that, this algorithm fits most of LDPC standards, including 802.16e, 802.11n, DVB-S2, GJB7296, GB20600, etc., and it is an effective solution for LDPC codes blind recognition in a noisy environment.

关键词： Complexity theory Cryptography IEEE 1394 Standard Presses Microwave communication Microwave FET integrated circuits

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Reconstruct LDPC codes in an error-free environment

Reconstruct LDPC codes in an error-free environment

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International Conference on Computer science and Network technology (ICCSNT)

作者： Xin Bao Yuanling Huang WenYa Gan Ling You National Key Laboratory of Science and Technology on Blind Signal Processing Chengdu China

This paper presents two algorithms to recover LDPC codes in an error-free environment. Both algorithms reconstruct the sparse parity-check matrices of LDPC codes based on elementary row transformation, and are equivalent to recognize LDPC codes. The first one is appropriate to the LDPC codes whose parity-check matrices have the double-diagonal structure; the second one is a general algorithm that ensures the second-best solution for every type of LDPC codes. Simulation results show that, these algorithms work well with most of LDPC standards and protocols, including 802.16e, 802.11n, DVB-S2 GJB7296 and GB20600.

关键词： Sparse matrices Parity check codes signal processing algorithms Block codes Algorithm design and analysis Hamming weight Standards

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Tissue P systems with cell separation: attacking the partition problem

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science China(Information sciences) 2011年第2期54卷 293-304页

作者： ZHANG XingYi1, WANG Shuo2, NIU YunYun2 & PAN LinQiang2 1Key Lab of Intelligent Computing and signal processing of Ministry of Education, School of Computer science and technology, Anhui University, Hefei 230039, China 2Image processing and Intelligent Control Key laboratory of Education Ministry of China, Department of Control science and Engineering, Huazhong University of science and technology, Wuhan 430074, China 1. Key Lab of Intelligent Computing and Signal Processing of Ministry of Education School of Computer Science and Technology Anhui University Hefei 230039 China2. Image Processing and Intelligent Control Key Laboratory of Education Ministry of China Department of Control Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China

Tissue P systems are distributed parallel and non-deterministic computing models in the framework of membrane computing, which are inspired by intercellular communication and cooperation between neurons. Recently, cell separation is introduced into tissue P systems, which enables systems to generate an exponential workspace in a polynomial time. In this work, the computational power of tissue P systems with cell separation is investigated. Specifically, a uniform family of tissue P systems with cell separation is constructed for effciently solving a well-known NP-complete problem, the partition problem.

关键词： membrane computing tissue P system cell separation partition problem

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Integral Backstepping Based Computed Torque Control for A 6 DOF Arm Robot 29

Integral Backstepping Based Computed Torque Control for A 6 ...

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第29届中国控制与决策会议

作者： Shuaishuai HAN Haoping WANG Yang TIAN Automation School Sino-French International Joint Laboratory of Automatic Control and Signal ProcessingNanjing University of Science and Technology

ISBN: (纸本)9781509046584

The focus of this survey is the modeling and control of a 6 DOF arm robot. Based on Lagrangian dynamics, a 6 DOF(degree of freedom) arm robot model is built. The computed torque control(CTC) is applied to the position tracking control and a planned trajectory is given. Furthermore, to improve the tracking speed and achieve the velocity tracking, a nonlinear integral backstepping(NIB) technique is combined with CTC. The final control scheme is proposed, in the name of CTC-NIB. Simulation results show the effectiveness of the proposed control method. Compared with traditional CTC, the CTC-NIB absolutely improve the tracking performance.

关键词： 6 DOF arm robot integral backstepping technique(IB) computed torque control(CTC) trajectory planning position tracking

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Model Free Control Based Nonlinear Integral-backstepping Control for Blood Glucose Regulation 6

Model Free Control Based Nonlinear Integral-backstepping Con...

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2017 IEEE 6th Data Driven Control and Learning Systems Conference (DDCLS’17)

作者： Qi Wu Haoping Wang Yang Tian Sino-French International Joint Laboratory of Automatic Control and Signal Processing School of Automation Nanjing University of Science ＆ Technology

ISBN: (纸本)9781509054626

In this paper, a Model Free Control based Nonlinear Integral Backstepping Control（MFC-NIB） strategy is developed and applied to blood glucose regulation systems, which is a typical biological system with parameter variations, uncertainties and external disturbances. Firstly, an Intelligent Proportional controller（iP）, which is based on model-free theory and whose algebraic estimation technique is replaced by a Time-Delay Estimation（TDE） method is developed. Secondly, to improve the control convergence, the MFC-NIB is studied based on the proposed iP. Finally, to demonstrate the performance and effectiveness of the proposed method MFC-NIB, the simulations with comparisons with iP have been implemented on the referred glycemia regulation systems.

关键词： Glycemia regulation Model-free control Time-delay estimation Model-free control based nonlinear integral backstepping control

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Efficient connection management solution in high-speed networks

Efficient connection management solution in high-speed netwo...

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International Conference on Electronics Information and Emergency Communication

作者： Rongji Liu Yunzhao Li Qiang Wei National Key Laboratory of Science and Technology on Blind Signal Processing Chengdu China

Poor data locality in high-speed networks leads to more memory accesses of connection management, which limits the throughput performance. In view of the above problem, this paper analyzed the process of connection management and access in detail, and put forward the efficient connection management solution to improve throughput on FPGA platform. This solution takes full advantage of the structural characteristics of SDRAM. By controlling access requests, it can make adjacent access requests access different banks, which can reduce hardware resource conflicts, shorten the time interval between access requests and improve throughput. In order to reduce the complexity of control, we selected multiple slots hash table as the data structure for connection management. Simulation results show that this solution shorten the time interval by about 71.4%.

关键词： Field programmable gate arrays Memory management Internet High-speed networks Throughput Random access memory Clocks

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Improving breakdown voltage performance of SOI power device with folded drift region

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Chinese Physics B 2016年第7期25卷 367-372页

作者：李琦李海鸥黄平奖肖功利杨年炯 Guangxi Key Laboratory of Precision Navigation Technology and Application Guilin University of Electronic Technology Guilin 541004 China Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing Guilin University of Electronic Technology Guilin 541004 China Guangxi Experiment Center of Information Science Guilin 541004 China Guangxi Key Laboratory of Automobile Components and Vehicle Technology Guangxi University of Science and Technology Liuzhou 545006 China

A novel silicon-on-insulator（SOI） high breakdown voltage（BV） power device with interlaced dielectric trenches（IDT） and N/P pillars is proposed. In the studied structure, the drift region is folded by IDT embedded in the active layer,which results in an increase of length of ionization integral remarkably. The crowding phenomenon of electric field in the corner of IDT is relieved by the N/P pillars. Both traits improve two key factors of BV, the ionization integral length and electric field magnitude, and thus BV is significantly enhanced. The electric field in the dielectric layer is enhanced and a major portion of bias is borne by the oxide layer due to the accumulation of inverse charges（holes） at the corner of *** average value of the lateral electric field of the proposed device reaches 60 V/μm with a 10 μm drift length, which increases by 200% in comparison to the conventional SOI LDMOS, resulting in a breakdown voltage of 607 V.

关键词： interlaced dielectric trenches folded drift region breakdown voltage N/P pillars

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