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检索条件"主题词=detection algorithms"

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Detecting communities in networks by merging cliques

Detecting communities in networks by merging cliques

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IEEE International Conference on Intelligent Computing and Intelligent Systems (ICIS)

作者： Bowen Yan Steve Gregory Department of Computer Science University of Bristol Bristol UK

ISBN: (纸本)9781424447374;9781424447541

Many algorithms have been proposed for detecting disjoint communities (relatively densely connected subgraphs) in networks. One popular technique is to optimize modularity, a measure of the quality of a partition in terms of the number of intracommunity and intercommunity edges. Greedy approximate algorithms for maximizing modularity can be very fast and effective. We propose a new algorithm that starts by detecting disjoint cliques and then merges these to optimize modularity. We show that this performs better than other similar algorithms in terms of both modularity and execution speed.

关键词： Merging Partitioning algorithms detection algorithms Computer science Data mining Data analysis Social network services Neural networks Communication networks Availability

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On the achievable improvement by the linear minimum mean square error detector

On the achievable improvement by the linear minimum mean squ...

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International Symposium on Communications and Information Technologies (ISCIT)

作者： Manar Mohaisen KyungHi Chang The Graduate School of IT and T Inha University Incheon South Korea

ISBN: (纸本)9781424445219

Linear minimum mean square error (MMSE) detector has been shown to alleviate the noise amplification problem, resulting in the conventional zero-forcing (ZF) detector. In this paper, we analyze the performance improvement by the MMSE detector in terms of the condition number of its filtering matrix, and in terms of the post-precessing signal to noise ratio (SNR) improvement. To this end, we derive explicit formulas for the condition numbers of the filtering matrices and the post-processing SNRs. Analytical and simulation results demonstrate that the improvement achieved by the MMSE detector over the ZF detector is not only dependent on the noise variance and the condition number of the channel matrix, but also on how close the smallest singular values are to the noise variance.

关键词： Mean square error methods Detectors Filtering Signal to noise ratio MIMO detection algorithms Vectors Analytical models Channel capacity Computational complexity

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Automated initial setup method for two-fingered micro hand system

Automated initial setup method for two-fingered micro hand s...

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2009 IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： Izumi Hatta Kenichi Ohara Tatsuo Arai Yasushi Mae Tomohito Takubo Department of Systems Innovation Graduate School of Engineering Science Osaka University Toyonaka Osaka Japan

A two-fingered micro hand has been available for use for years and allows dexterous manipulation of a single cell: grabbing, positioning, rotating and releasing. The end-effector of this micro hand consists of two glass needles; however, the glass tips must be finely adjusted and the micro hand must be calibrated prior to use. Because these initial procedures require highly skilled human operators and a great deal of time, a fine adjustment module (FAM) has been developed for assisting with the fine adjustment work and was successfully shown to make the initial setup easier. However, problems with the calibration process and with the dependence on a user of the FAM control are still present. One means of improving the system for users is to automate the initial setup. The detection of the glass tips in a wide range of Z directions from a microscopic image having a small depth of focus requires robust calibration and must be possible using an automated FAM control. From this perspective, the tip position detection algorithm using the evaluation function, Image Quality Measurement (IQM), is proposed in this paper. Based on this algorithm, the automated initial setup method is explained and its effectiveness is experimentally evaluated.

关键词： Glass Calibration Automatic control Needles Humans Microscopy Focusing Robust control detection algorithms Image quality

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Dealing with Multi Security Policies in Communication Networks

Dealing with Multi Security Policies in Communication Networ...

引用

International Conference on Networking and Services (ICNS)

作者： Ryma Abassi Sihem Guemara El Fatmi Sup' COM School of Communication Engineering Tunis Tunisia

In any organization, there are generally several applications in place and usually, each application has its own security policy. In fact, the ability to define multiple security policies is needed in several cases. Moreover, heterogeneous security mechanisms can be used to achieve security objectives. However, implementing a unified security policy for all theses mechanisms becomes then unfeasible. Hence, a formal representation of security policies is needed. Furthermore, since theses policies are generally written by different people, they may have conflicts. The main contribution of this paper concerns then, the formalization of security policies conflicts as well as their detection and resolution.

关键词： Communication networks Information security Electronic mail Communication system security Protection Humans detection algorithms

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Metrological characterization of algorithms adopted for voltage dip measurement

Metrological characterization of algorithms adopted for volt...

引用

IEEE Instrumentation and Measurement Technology Conference

作者： Daniele Gallo Carmine Landi Mario Luiso Dipartimento di ingegneria dell informazione Seconda Università di Napoli Campania Italy

ISBN: (纸本)9781424433520

This paper analyzes accuracy of algorithms commonly adopted in instrument devoted to the detection and the characterization of voltage dips (also called sags). This analysis is particularly interesting because the results of dip measurements are utilized for calculation of severity levels and the site index assessment that are parameters adopted in determination of quality level of power supply but also in developing planning and design criteria of new electrical power grid or for selecting equipment with proper intrinsic immunity. Anyway there is a certain degree of freedom is left to instrument manufacturers (f.i. the choice of dip detection algorithm) and it can be found that, different instruments significantly disagree in some actual measurements. The paper analyzes most diffused dip detection algorithms presenting the introduced systematic deviations in event characterization. The obtained results are aimed to be taken into account and applied to performance verification of a commercial dip monitoring instrument.

关键词： Voltage fluctuations Voltage measurement Instruments Algorithm design and analysis detection algorithms Power measurement Electric variables measurement Particle measurements Power supplies Power grids

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Identifying Useless States in Non-FIFO Distributed Computations by Using Pseudo Timestamps

Identifying Useless States in Non-FIFO Distributed Computati...

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International Symposium on Parallel Architectures, algorithms and Networks (ISPAN)

作者： Lung-Pin Chen Meng-Yuan Ho Jhen-You Hong Department of Computer Science and Information Engineering Tunghai University Taichung Taiwan

In a distributed system, a monitor process collects the execution states and invokes a detection procedure to test and debug the program. This paper investigates the global state analyzing problems for the non-FIFO distributed environments. In this paper, the states unknown to the monitor process are represented by using the pseudo states. Based on this technique, this paper develops an algorithm capable of identifying the maximum number of useless states for the programs run in an non-FIFO distributed environment.

关键词： Distributed computing System testing Debugging Computer networks Pervasive computing Computer science Computerized monitoring detection algorithms Acceleration Logic testing

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Bounding-Volume Hierarchies Technique for Detecting Object Interference in Urban Environment Simulation

Bounding-Volume Hierarchies Technique for Detecting Object I...

引用

International Conference on Environmental and Computer Science (ICECS)

作者： Hamzah Asyrani Sulaiman Abdullah Bade Norhaida Mohd Suaib Universiti Teknikal Malaysia Melaka Tunggal Malacca Malaysia Universiti Teknologi Malaysia Skudai Johor Malaysia

Performing and detecting object interference or collision detection in urban environment simulation is always challenging problem for researchers to come out with fast and efficient collision detection algorithm. Most of previous method seems trying to tackle the problems of involving specific geometric models colliding pairs with restricted rules and guidelines. For example, convex hull bounding-volume tends to solve the collision detection problems by make the collision more accurate. However, its limitation of performing fast collision detection method must be left behind. Hence, in this paper we introduce new traversal algorithm using bounding-volume hierarchies (BVH) for collision detection in urban environment simulation. By using hierarchical approach, the efficiency of detecting object interference in urban simulation is increase. We believe that BVH method can be useful in urban simulation for collision detection between static rigid models and dynamic rigid models. Thus it should be able to overcome the equipment of urban environment simulation. Our result shows that bounding-volume hierarchies achieve favorable frame-rates in real time simulation using top-down binary tree. In practice, the construction of bounding-volume hierarchies in urban environment simulation are not just useful for collision detection but they also useful for others detecting object interference technique such culling and raytracing.

关键词： Object detection Interference Computational modeling Testing Computer science Computer simulation detection algorithms Solid modeling Computational efficiency Performance evaluation

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Corner Detector Algorithm for Colour Image with Highlights and Shadows

Corner Detector Algorithm for Colour Image with Highlights a...

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International Conference on Information Science and Engineering (ICISE)

作者： Shi-Guo Huang Ming-Quan Zhou Guo-Hua Geng Xiaolin Li Comput. & Inf. Coll. Fujian Agric. & Forestry Univ. Fuzhou China Coll. of Inf. Sci. & Technol. Beijing Normal Univ. Beijing China Visualization Technol. Inst. Northwest Univ. Xi'an China

Traditional curvature scale space (CSS) corner detection algorithms did not differentiate various physical causes of image differential structure, therefore these algorithms could not detect corners correctly in color image with shadows and highlights. According to the problem above mentioned, dichromatic reflection model was applied to differentiate image differential structure and multi scale localization and multi scale detection algorithm was improved. Finally new dichromatic reflection model based CSS algorithm was proposed. Experimental results showed that the new algorithm could detect the corner of the objects in image with highlights and shadows correctly, while traditional algorithm obtained many false corners. The new algorithm is better than the traditional algorithms in performance.

关键词： Detectors Optical reflection detection algorithms Color Cascading style sheets Information science Educational institutions Space technology Object detection Reflectivity

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Outlier elimination for robust ellipse and ellipsoid fitting

Outlier elimination for robust ellipse and ellipsoid fitting

引用

IEEE International Workshop on Computational Advances in Multi-Sensor Adaptive Processing (CAMSAP)

作者： Jieqi Yu Haipeng Zheng Sanjeev R. Kulkarni H. Vincent Poor Department of Electrical Engineering Princeton University Princeton NJ USA

ISBN: (纸本)9781424451791;9781424451807

In this paper, an outlier elimination algorithm for ellipse/ellipsoid fitting is proposed. This two-stage algorithm employs a proximity-based outlier detection algorithm (using the graph Laplacian), followed by a model-based outlier detection algorithm similar to random sample consensus (RANSAC). These two stages compensate for each other so that outliers of various types can be eliminated with reasonable computation. The outlier elimination algorithm considerably improves the robustness of ellipse/ellipsoid fitting as demonstrated by simulations.

关键词： Robustness Ellipsoids detection algorithms Laplace equations Conferences Computational modeling Statistics Neural networks Machine learning Counting circuits

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SB-RAWVec - A Semi-Blind Watermarking Method for Vector Maps

SB-RAWVec - A Semi-Blind Watermarking Method for Vector Maps

引用

IEEE International Conference on Communications (ICC)

作者： K. Magalhaes R. Dahab Instituto de Computer ção State University of Campinas-UNICAMP Sao Paulo Brazil

RAWVec is a private watermarking method for vector maps that uses a raster image as watermark. Visually recognizable watermarks can add extra information like integrity and authentication, while blind watermarks do not need the original data to be published for the detection. This work presents a semi-blind version of RAWVec, i.e. a method that uses the original vector map during the detection without revealing it, but maintains the watermark as a raster image.

关键词： Watermarking Testing detection algorithms Peer to peer computing Geographic Information Systems Communications Society Authentication Videos Performance evaluation Data mining

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