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检索条件"主题词=detection algorithms"

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RRE: A game-theoretic intrusion Response and Recovery Engine for process control applications

RRE: A game-theoretic intrusion Response and Recovery Engine...

引用

International Conference on Critical Infrastructures, CRIS

作者： William H. Sanders Coordinated Science Laboratory Information Trust Institute University of Illinois Urbana-Champaign Champaign USA

Preserving the availability and integrity of process control systems in the face of fast-spreading intrusions requires advances not only in detection algorithms, but also in automated response techniques. In this presentation, we propose a new approach to automated response called the response and recovery engine (RRE). Our engine employs a game-theoretic response strategy against adversaries modeled as opponents in a two-player Stackelberg stochastic game. RRE applies attack-response trees to analyze undesired security events and their countermeasures using Boolean logic to combine lower-level attack consequences. In addition, RRE accounts for uncertainties in intrusion detection alert notications. RRE then chooses optimal response actions by solving a partially observable competitive Markov decision process that is automatically derived from attack-response trees. Experimental results show that RRE, using Snort's alerts, can protect large networks for which attack-response trees have more than 500 nodes.

关键词： Engines Process control Face detection detection algorithms Stochastic processes Security Boolean functions Uncertainty Intrusion detection Protection

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Active islanding of a current-controlled converter-interfaced DG

Active islanding of a current-controlled converter-interface...

引用

Power Tech Conference

作者： Fainan Hassan Math Bollen AREVA T and D Technology Centre UK Sweden and Luleå University of Technology STRI AB Skelleftea Sweden

Islanding of a voltage source converter (VSC) equipped DG unit is considered in this paper. Some internal controller signals are implemented in the islanding detection method in order to provide a robust operation. Particularly, the estimated frequency of the grid voltage along with a point of common coupling (PCC) voltage regulator and a dynamic reference-current limiter are proposed for islanding detection algorithm. Using a PCC-voltage regulator adds the active, or dynamic, property for the detection algorithm and increases its reliability. Moreover, implementing a dynamic current limiter, a robust operation is achieved. Through the proper design of the current limiter, the DG unit can have the ability to ride-through voltage dips with magnitudes above a certain limit, which can be set according to the grid codes, and detect islanding if the voltage decreases beyond that limit. The algorithm has also been verified for the case of island motor loads, which is considered as the worst case since dynamic loads affect the grid states in the case of islanding.

关键词： Voltage Frequency estimation Regulators detection algorithms Current limiters Converters Power conversion Robust control Robustness Power system stability

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A Novel Fault Observer Design and Application in Flight Control System

A Novel Fault Observer Design and Application in Flight Cont...

引用

International Conference on Natural Computation (ICNC)

作者： Yongqi Chen Zhiguang Zhong Intelligence Science and Electromechanical Systems Laboratory College of Science and Technology Ningbo University Ningbo China

ISBN: (纸本)9781424445424

For estimating the fault signals of the discrete flight control system with unknown senor faults and actuator faults simultaneously, a discrete proportional integral observer (PIO) is presented. The proposed PIO uses the augment states to estimate the sensor faults of the flight control system. Moreover, this observer uses an additionally introduced integral term of the output error to obtain the estimation of actuator faults. The convergence of the PIO is proved. The proposed fault observer is applied in flight control system. Simulation results are given to demonstrate the effectiveness of the proposed fault observer.

关键词： Aerospace control detection algorithms Object detection Testing Geometry Solid modeling Mortar Tree data structures Application software Orbital robotics

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A Novel Method for Boundary Condition Computation in Soft Tissue Deformation

A Novel Method for Boundary Condition Computation in Soft Ti...

引用

Computer Science and Information Engineering, CSIE, WRI World Congress on FLAGGED

作者： Shengzheng Wang Jie Yang Kai Xie Merchant Marine College Shanghai Maritime University Shanghai China Institute of Image Processing & Pattern Recognition Shanghai Jiaotong University Shanghai China The Methodist Hospital Research Institute Cornell university Houston TX USA

Simulating the soft tissue deformation based on bone-related planning is one of the most difficult issues in generating realistic motion of soft tissues. The difficulty of this problem arises from unclear boundary conditions. In facial soft tissue deformation, the boundary conditions of the finite element modeling are related to the bone movements. In order to better map the bone movements to the soft tissue model, a fast and robust computational strategy for boundary conditions is presented in this paper. First, a collision detection algorithm is employed to query contact position after repositioning of bones. Then, an improved 3D discrete distance field algorithm is proposed to perform imposed displacement computation of contact vertices. Finally, boundary conditions are calculated in terms of the imposed displacements. This approach can automatically handle boundary conditions of the complex geometrical modeling without prior assumption or knowledge about the position of contacts. The effectiveness of our method is demonstrated on complex soft tissue deformation.

关键词： Boundary conditions Biological tissues Deformable models Computational modeling Finite element methods Bones Surgery detection algorithms Solid modeling Skull

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A Stack algorithm with limited tree-search

A Stack algorithm with limited tree-search

引用

International Conference on Signals, Circuits and Systems, SCS

作者： Rym Ouertani Ghaya Rekaya Ben-Othman TELECOM ParisTech Paris France

ISBN: (纸本)9781424443970;9781424443987

Due to the capacity achievable, Multiple-Input Multiple-Output (MIMO) systems witnessed more interest in recent years. Several data detection algorithms are available for MIMO systems, especially the tree-search ones which offer lower complexity comparing to the ML receiver. In this paper, we are interested in one of tree-search algorithms, which is the Stack decoder. Nevertheless, the stack decoder is only proposed to decode MIMO systems employing finite constellations, as the QAM (Quadrature Amplitude Modulation). In this work, we introduce a new Stack decoder capable of decoding lattice and we call it the M-Stack decoder. The principle idea behind it is to generate M nodes at each tree-level and so to reduce the infinite alphabet of the lattice to only M components at each step. Then, we propose to adapt it to decode QAM constellations. This one is compared to the known QRD-Stack algorithm. While both visit the same number of nodes, the proposed M-Stack algorithm offers lower computational complexity and it is much faster than the QRD-Stack one.

关键词： Decoding Lattices MIMO Quadrature amplitude modulation Receiving antennas Constellation diagram Circuits and systems Telecommunications detection algorithms Computational complexity

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A modified 2-D logarithmic search technique for video coding with reduced search points

A modified 2-D logarithmic search technique for video coding...

引用

International Conference on Computer and Information Technology (ICCIT)

作者： Tahmina Akhtar Rahima Akter Chhalma Sultana Chhaya Ashfaqur Rahman Department of CSE Military Institute of Science and Technology Dhaka Bangladesh Centre of Intelligent and Networked Systems Central Queensland University QLD Australia

Video coding is a process for representing video sequences in a compact manner. A significant step in video coding is searching for similar segments in previous frames and use only the difference information for reconstruction thus reducing space requirement. Different search techniques including full search and 2-D logarithmic search etc. are used in the current literature. Full search restricts its application because of its computational load. 2D logarithmic search is computationally less expensive although there are some spaces for improvement. In this paper we propose a new search technique by modifying the 2-D logarithmic search that requires less search points with insignificant loss in visual quality. Experimental results demonstrate the effectiveness of the proposed technique.

关键词： Video coding Data mining detection algorithms Cleaning Sorting Databases Information technology Computer science Data engineering

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Failure Control in Multipath Route Tracing

Failure Control in Multipath Route Tracing

引用

IEEE Annual Joint Conference: INFOCOM, IEEE Computer and Communications Societies

作者： D. Veitch B. Augustin R. Teixeira T. Friedman ARC Special Centre of Ultra-Broadband Information Networks (CUBIN) an affiliated program of National ICT Australia (NICTA) University of Melbourne Australia LIP6 Laboratory University of Pierre and Marie Curie-Paris VI CNRS Paris France

ISBN: (纸本)9781424435128

Traceroute is widely used to report the path packets take between two Internet hosts, but the widespread deployment of load balancing routers breaks a basic assumption - that there is only a single such path. We specify an adaptive, stochastic probing algorithm, the multipath detection algorithm (MDA), to report all paths that probes can follow between a source and a destination. We establish the foundations of, and show how to calculate, rigorous statistical guarantees for the discovery of the entire multipath route. We explore algorithm cost/guarantee tradeoffs in real experiments and show the inadequacy of the classic practice of sending three probes per hop.

关键词： Probes Load management IP networks Stochastic processes detection algorithms Communications Society Communication system control Laboratories Costs Assembly

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Study on soft phase locked method to solving the synchronization problem of active power filter in stand-alone power grid

Study on soft phase locked method to solving the synchroniza...

引用

International Conference on Power Electronics and Motion Control (IPEMC)

作者： Fang Zhuo Longhui Wu Zhe Chen Xianwei Wang Zhaoan Wang Sch. of Electr. Eng. Xi'an Jiaotong Univ. Xi'an China Aalborg Universitet

Traditional LC filters can't work stably in small rating stand-alone power grid. So active power filter (APF) is becoming an important tool to solve the power quality problem in small rating stand-alone power grid. In most current detection algorithm of APF, it needs a synchronizing signal. Firstly, the influence of the synchronizing signal error on current detection of APF is analyzed in this paper. Voltage distortion, voltage unbalance and frequency fluctuation are frequent and severe in small rating stand-alone power grids, so traditional synchronizing signal obtaining method--phase locking based on zero-cross detection can't work effectively in small rating stand-alone power grid. Then a soft phase locked loop with additional filter is proposed. It can lock the phase angle on to the positive sequence of fundamental voltage accurately and rapidly. It ensures the performance of APF applied in the small rating stand-alone power grid. Moreover, the soft phase locked loop is easy to be implemented in a Digital Signal Processor (DSP). Simulation and experimental results validate that the soft phase locked loop has satisfactory performance.

关键词： Active filters Power grids Frequency synchronization Voltage Phase locked loops Power quality detection algorithms Signal analysis Distortion Fluctuations

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Research on Traffic Flow Fuzzy Time Series Forecasting Algorithm of Single Intersection

Research on Traffic Flow Fuzzy Time Series Forecasting Algor...

引用

International Conference on Innovative Computing, Information and Control (ICICIC)

作者： Wen-ge Ma Yan Yan Liaoning University of Technology Jinzhou Liaoning CN Department of Automation Liaoning Petrochemical Vocational and technology College Jinzhou China

Because of the highly nonlinear of the Traffic flow prediction, it is very difficult to build its model. In this paper an algorithm which is based on fuzzy time series forecasting, is used to overcome the difficulty. And we use Coil-based virtual video detectors detect the traffic flow as a input of fuzzy time series prediction, this can make the historical data collection faster and more accurate. The simulation proved it is better than others.

关键词： Traffic control Communication system traffic control Coils Signal processing algorithms detection algorithms Fuzzy control Vehicle detection Predictive models Image sequences Educational institutions

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Distributed Sphere Decoding

Distributed Sphere Decoding

引用

International Conference on Telecommunications (ICT)

作者： Charlotte Dumard Erwin Riegler Forschungszentrum Telekommunikation Wien Vienna Austria

Based on a simple gossip algorithm, which computes the sum of values known by several nodes, we investigate the research challenge of distributed sphere decoding. We provide distributed algorithms to perform both the QR decomposition as well as the tree search. Compared to the case where one declares one node as a centralized unit, this approach is much more robust against node and link failures. This is due to the fact that the target nodes for the gossip algorithm are chosen uniformly at random in each iteration. Numerical simulations show that even for a very small number of iterations the results coincide with the traditional centralized sphere decoder.

关键词： Distributed algorithms Robustness Iterative decoding Distributed computing Convergence Numerical simulation Batteries Transmitters detection algorithms Message passing

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