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检索条件"主题词=iterative algorithm"

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A Low Complexity and High Speed Gradient Descent Based Secure Localization in Wireless Sensor Networks

A Low Complexity and High Speed Gradient Descent Based Secur...

引用

3rd International Conference on Computer and Knowledge Engineering (ICCKE)

作者： Mofarreh-Bonab, Mostafa Ghorashi, Seyed Ali ShahidBeheshti Univ GC Fac Elect & Comp Engn Dept Elect Engn Cognit Telecommun Res Grp Tehran *** Iran

ISBN: (纸本)9781479920938

In many applications of Wireless Sensor Networks (WSNs) such as monitoring applications or routing, localization is one of the important issues that affect directly the network quality of operation. Secure localization in WSNs needs to detect malicious nodes and exclude them in order to avoid deception by attackers. Accurate and appropriate methods that are usually iterative algorithms such as gradient descent, least median square (LMdS) and voting based secure localization have been introduced in the recent literature. Gradient descent based secure localization has better performance in terms of convergence speed and accuracy while have the minimum complexity compared to the other methods, however, still more convergence speed is needed for real-time applications. In this paper, a new gradient based method has been introduced which has higher convergence speed among all existing algorithms and the probability of fault for this algorithm is less than other algorithms. The other advantage of the proposed method is its low complexity in comparison to the other methods and its capability to be implemented in hardware. Simulation results show that the introduced algorithm's convergence speed is about 10 times more than the gradient descent algorithm with same localization error.

关键词： component secure localization iterative algorithm gradient based localization

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A Simple and Effective Testing Method for the Implementation of Turbo Decoders

A Simple and Effective Testing Method for the Implementation...

引用

6th International Conference on Wireless Communications, Networking and Mobile Computing (WICOM)

作者： Ma, Zheng Fan, Pingzhi Mow, Wai Ho Southwest Jiaotong Univ Prinvential Key Lab Informat Coding & Transmiss Chengdu 610031 Sichuan Peoples R China Hong Kong Univ Sci & Technol Dept EEE Hong Kong Hong Kong Peoples R China

ISBN: (纸本)9781424437092

It is well-known that Turbo codes are very useful in digital communications. However, due to the existence of interleaver/deinterleaver, there is no effective way available to test the correctness of the 'turbo' algorithms in practical use such as FPGA/DSP implementation, especially in very low bit error rate. In this paper, based on the extractable theoretical bounds for interleaver by-passed systems, a simple but effective testing method is proposed by separating the turbo coder into interleaver/deinterleaver part and soft-in soft-out (SISO)-iterative decoding part. Our analysis and simulation results for turbo code shows that the proposed method brings no extra cost in implementation and is proved to be practical and effective. In principle, the proposed method can be generalized to almost all turbo or turbo-like systems, in which the theoretical bounds can be extracted in the absence of interleaver/de-interleaver.

关键词： Turbo system Interleaver iterative algorithm testing technology FPGA/DSP

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An iterative method for quasi-variational-like inclusions with fuzzy mappings

An iterative method for quasi-variational-like inclusions wi...

引用

1st International Conference on Rough Sets and Knowledge Technology (RSKT 2006)

作者： Zou, Yunzhi Huang, Nanjing Sichuan Univ Math Coll Chengdu 610064 Sichuan Peoples R China

ISBN: (纸本)3540362975

This paper presents an iterative method for solving a class of generalized quasi-variational-like inclusions with fuzzy mappings. The method employs step size controls that enable applications to problems where certain set-valued mappings do not always map to empty set. The algorithm also adopts the recently introduced (H, eta)-monotone concept which unifies many known monotonicities. Thus generalized many existing results.

关键词： generalized quasi-variational-like inclusion iterative algorithm fuzzy mapping resolvent operator

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An iterative Approach for Searching an Equilibrium in Piecewise Linear Exchange Model 9th

An Iterative Approach for Searching an Equilibrium in Piecew...

引用

9th International Conference on Discrete Optimization and Operations Research (DOOR)

作者： Shmyrev, Vadim I. Sobolev Inst Math Novosibirsk Russia

ISBN: (纸本)9783319449142;9783319449135

The exchange model with piecewise linear separable concave utility functions is considered. This consideration extends the author's original approach to the equilibrium problem in a linear exchange model and its variations. The conceptual base of this approach is the scheme of polyhedral complementarity. It has no analogs and made it possible to obtain the finite algorithms for some variations of the exchange model. Especially simple algorithms arise for linear exchange model with fixed budgets (Fisher's model). This is due to monotonicity property inherent in the models and potentiality of arising mappings. The algorithms can be considered as a procedure similar to the simplex-method of linear programming. It is natural to study applicability of the approach for more general models. The considered piecewise linear version of the model reduces to a special exchange model with upper bounds on variables and the modified conditions of the goods' balances. For such a model the monotonicity property is violated. But it remains, if upper bounds are substituted by financial limits on purchases. This is the idea of proposed iterative algorithm for initial problem. It is a generalization of an analogue for linear exchange model.

关键词： Exchange model Economic equilibrium Fixed point Linear programming Polyhedral complementarity Monotonicity iterative algorithm

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Reflectance model for color halftone prints

Reflectance model for color halftone prints

引用

Conference on Color Imaging XIII

作者： Zhang, Yixin Ge, Jinghuan Zang, Dongjuan Jiangnan Univ Sch Sci Wuxi Peoples R China Jiangnan Univ Sch Informat Technol Wuxi Peoples R China

ISBN: (纸本)9780819469793

The scattering of light within paper and the ink penetration in the substrate are the key factors which affect the color reproduction. A reflectance model for color halftone prints is introduced in this paper which considers these factors. The model is obtained by the extended Murray-Davies model and iterative algorithm. The model described in this paper contains two parameters, n and v. The n factor equals to the sum of w and v. The w factor relates to the optical spread function of paper relative to the spatial frequency of the halftone dots. The v factor relates to the distribution of colorant within the dots. The value of n and v are obtained by simulation according to the experimental data. For offset lithographic halftone data at 1501pi, the value of n and V are 1.578 and 0.02, thermal wax transfer halftone (n=2.292, v=0.0209) and stochastic halftone (n=1.1853, v=-0.006).

关键词： reflectance color prediction light scattering halftone image iterative algorithm

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Numerical and Experimental correlation on Electro-Hydro Dynamic system for Small Aircraft propulsion

Numerical and Experimental correlation on Electro-Hydro Dyna...

引用

AIAA Propulsion and Energy Forum / IEEE Electric Aircraft Technologies Symposium (EATS)

作者： Loehrmann, Antoine Rivenc, Jean Peres, Gilles Dufour, Guillaume Rogier, Francois Kourtzanidis, Konstantinos Airbus SAS Cent Res & Technol Div 18 Rue Marius Terce FR-31025 Toulouse France Off Natl Etud & Rech Aerosp French Aerosp Lab F-31000 Toulouse France Ctr Res & Technol Hellas Chem Proc & Energy Resources Inst Thessaloniki Greece Airbus Cent R&T Toulouse France

ISBN: (数字)9781624106118

ISBN: (纸本)9781624106118

In this study, we explored numerical and experimental tools, in order to study phenomena linked toEHD (Electro Hydro Dynamics), for the purpose of thrust applications for MAV (Micro Air Vehicles). A canonical case was considered, namely a wire of 50µm radius with a DC positive voltage, in front of a NACA 2412 profile at ground *** numerical approach consisted of self-consistently solving the ionization and drift phases, by combining a Poisson solver, for the electric field computation, and a plasma-fluid solver in an iterative process, until steady state was reached. The code COPAIER, developed by ONERA, was used for this *** discharge current was computed for several voltages between the electrodes, and the EHD force was injected into a CFD solver, in order to retrieve the ionic wind characteristics. An experimental study was also performed, by measuring the current-voltage characteristics. The latter was compared to numerical results. A deviation of less than 20% was obtained, as long as the discharge remained in the corona regime. Given the complexity of the studied phenomena, this result was better than our expectation. The corona to streamer transition was not studied, but could be taken into account by COPAIER. At last, the effect of pressure was experimentally studied, in the range between atmospheric pressure and 700mbars. The derating factor was evaluated between these two conditions: in our case, it was necessary, either to reduce the voltage by 10%, or to increase the electrodes gap by 30%.

关键词： Micro Air Vehicle NACA 2412 Aircraft Propulsion Electro Hydro Dynamics Numerical Modeling Poisson's Equation Finite Element Formulation Velocity Profiles Dielectric Barrier Discharge iterative algorithm

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Self-calibrating phase shifting shadow moire technique 10

Self-calibrating phase shifting shadow moire technique

引用

10th International Symposium on Precision Engineering Measurements and Instrumentation (ISPEMI)

作者： Du, Hubing Yu, Jianhong Zhang, Shaofeng Xian Technol Univ Sch Mechatron Engn Xian 710032 Shaanxi Peoples R China

ISBN: (数字)9781510627826

ISBN: (纸本)9781510627826

The phase shifting shadow moire is an efficient technique for 3-D shape measurement. Our recent research focuses on improving its measurement accuracy without addition the complication of the experimental set-up. Considering that the existing measurement process of shifting shadow moire technique is complex, we had been looking for ways to make it easier. In this paper we propose some effective techniques to fulfil the aim. In the proposed method, the binocular stereovision technique is used to calibrate the geometric parameters of our setup. Then a method is developed to determine the grating translation difference. After that an iterative self-tuning algorithm is use to retrieve the accurate phase. The proposed method is fast and can be implemented easily in many applications. Optical experiments are implemented to verify the feasibility of this method.

关键词： iterative algorithm shadow moire phase-shifting

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Weighted Sum Rate Maximization in the Underlay Cognitive MISO Interference Channel

Weighted Sum Rate Maximization in the Underlay Cognitive MIS...

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22nd IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Gallo, Laurent Negro, Francesco Ghauri, Irfan Slock, Dirk T. M. Politecn Torino 24 Corso Duca Abruzzi I-10129 Turin Italy GAIA Intel Mobile Commun F-06560 Sophia Antipolis France EURECOM Mobile Commun Dept F-06904 Sophia Antipolis France

ISBN: (纸本)9781457713484

In this paper we address the problem of Weighted Sum Rate (WSR) maximization for a K-user Multiple-Input Single-Output (MISO) cognitive Interference Channel (IFC) with linear transmit beamforming (BF) vectors in an underlay cognitive radio setting. We consider a set of L single-antenna Primary receivers to which the cognitive system can causes a limited amount of interference. We thus propose an iterative algorithm to determine the BF vectors for the secondary transmission. The optimization of the Lagrange multipliers involved in the optimization problem is based on the subgradient method. The expression of the BF vector can be interpreted as dual Uplink (UL) MMSE receiver that takes into account the interference caused by a fictitious link between the primary user and secondary base station. Finally Deterministic Annealing is applied to make the convergence of the algorithm easier.

关键词： BF vector Convergence Interference K-user multiple-input single-output L single-antenna primary receiver Lagrange multiplier MISO cognitive interference channel MMSE receiver Noise Optimization Receivers Strontium Vectors WSR maximization antennas array signal processing cognitive radio cognitive radio cognitive system deterministic annealing iterative algorithm iterative methods linear transmit beamforming mean square error methods primary user radio receivers radiofrequency interference secondary base station underlay cognitive MISO interference channel uplink weighted sum rate maximization wireless channels

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Optimum Quantization Intervals by Chernoff Information and Deflection Criterion in Distributed Sensing

Optimum Quantization Intervals by Chernoff Information and D...

引用

IEEE Wireless Communications and Networking Conference (WCNC)

作者： Altay, Can Delic, Hakan Bogazici Univ Dept Elect & Elect Engn Wireless Commun Lab TR-34342 Istanbul Turkey

ISBN: (纸本)9781479930838

A distributed system which comprises independent sensors and a fusion center is considered. Optimum quantization of sensor observations by Chernoff Information (CI) and deflection criterion (DC) for detection purpose is studied. Chernoff information of overall system is derived, and locally optimum quantization of sensor observations is proved to achieve global optimality. A relationship between DC and CI of quantized observations is established. A novel iterative algorithm which works similar to Lloyd-Max algorithm is proposed to find optimum quantization intervals. Results indicate that optimum 2-bit quantization gives detection performance that is close to what is achievable by collecting soft reports from sensors.

关键词： distributed sensors iterative methods quantisation (signal) sensor fusion signal detection Chernoff Information Lloyd-Max algorithm deflection criterion distributed system fusion center independent sensors iterative algorithm optimum 2-bit quantization optimum quantization sensor observations Distributed databases Optimization Quantization (signal) Sensor fusion Sensor systems Upper bound

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Research of thermal processes in goffered heat sink

Research of thermal processes in goffered heat sink

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9th International Conference on the Experience of Designing and Application of CAD Systems in Microelectronics

作者： Gaponenko, Nikolay Ogrenich, Eugeny Zaporozhye Natl Tech Univ UA-69063 Zaporozhe Ukraine

Heat transfer processes in goffered heat sink are investigated. Dependences of heat transfer factors from an angle of goffering are received. The optimization opportunities of weight and sizes are shown.

ISBN: (纸本)9789665335870

关键词： thermal mode goffered radiator heat transfer factor optimization of a design iterative algorithm

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