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3rd International Conference on Civil Engineering and Transportation (ICCET 2013)

作者： Fang, Xiaoli Xiong, Dan Zhou, Zhao Wang, Jianbo He, Cao Chen, Lin Si Chuan Commun Vocat Technol Coll Sichuan Coll K Chengdu Peoples R China

ISBN: (纸本)9783038350064

In order to study the optimal network of feeder bus lines for rail stations, this paper established an optimization model with the objective of minimizing the consume time and operating costs of unit traveler, and proposed an iterative algorithm to solve the model and then used an example to describe the practicality of the model and the algorithm.

关键词： Feeder Bus Optimization Model Line Design iterative algorithm

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

Optimum Quantization Intervals by Chernoff Information and D...

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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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Automatic Localization of the Optic Disc Based on iterative Brightest Pixels Extraction

Automatic Localization of the Optic Disc Based on Iterative ...

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International Symposium on Computer, Consumer and Control (IS3C)

作者： Yu, Chun-Yuan Yu, Shyr-Shen Nan Kai Univ Technol Dept Digital Living Innovat Taichung Taiwan Natl Chung Hsing Univ Dept Comp Sci & Engn Taichung 40227 Taiwan

ISBN: (纸本)9781479952779

The identification of the optic disc (OD) is necessary for the computer aided diagnosis of retinal diseases, but most methods for the OD detection often fail in the existence of retinal lesions and imaging artifacts. This paper proposes a new method based on iterative brightest pixels extraction (IBPE) for OD localization, which is designed to overcome the presence of large exudates or bright artifacts. The iterative algorithm integrates brightest pixels extraction and discrimination of geometric features. At each iteration step, the brightest pixels are extracted and a binary candidate map is constructed. In order to distinguish the OD region from candidates, two geometric features of each candidate are employed. Then, a checking process is performed. The algorithm deletes the false positive OD region and re-gets the new brightest pixels, iteratively. Hence, the real OD region rises finally though it is not bright at the first. The proposed method is evaluated on STARE retinal database. The experimental results show that the performance achieves a success rate of 95%.

关键词： optic disc detection brightest region geometric feature iterative algorithm

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An iterative algorithm Used for Node Position Derivation in Wireless Sensor Networks

An Iterative Algorithm Used for Node Position Derivation in ...

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2010 IEEE International Conference on Intelligent Computing and Intelligent Systems(2010 IEEE 智能计算与智能系统国际会议 ICIS 2010)

作者： Qinqin Shi Jianping Zhang Jiujun Cheng Department of Computer Science and technology Tongji University ShanghaiChina CSG Smart Sci &Tech.co. Ltd Shanghai China Department of Computer Science and Technology Tongji University Shanghai China

A node position derivation algorithm called IR for WSNs is developed in this paper. IR is an iterative algorithm based on node-beacon distance information. It is assumed that each sensor node can connect with several beacons by one-hop or multihop and estimate the node-beacon distances, and then, the algorithm is executed in a distributed mode. Simulation is provided to compare our proposed algorithm with two representative position derivation algorithms, Min-max and Lateration, in terms of some evaluation parameters. The simulation shows that our proposed algorithm can be a utilitarian node position derivation algorithm for WSNs.

关键词： wireless sensor networks node position derivation iterative algorithm accuracy computation overhead

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Model-based X-ray CT Image and Light Field Reconstruction Using Variable Splitting Methods

Model-based X-ray CT Image and Light Field Reconstruction Us...

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作者： Nien, Hung University of Michigan

学位级别：doctor

Model-based image reconstruction (MBIR) is a powerful technique for solving ill-posed inverse problems. Compared with direct methods, it can provide better estimates from noisy measurements and from incomplete data, at the cost of much longer computation time. In this work, we focus on accelerating and applying MBIR for solving reconstruction problems, including X-ray computed tomography (CT) image reconstruction and light field reconstruction, using variable splitting based on the augmented Lagrangian (AL) methods. For X-ray CT image reconstruction, we combine the AL method and ordered subsets (OS), a well-known technique in the medical imaging literature for accelerating tomographic reconstruction, by considering a linearized variant of the AL method and propose a fast splitting-based ordered-subset algorithm, OS-LALM, for solving X-ray CT image reconstruction problems with penalized weighted least-squares (PWLS) criterion. Practical issues such as the non-trivial parameter selection of AL methods and remarkable memory overhead when considering the finite difference image variable splitting are carefully studied, and several variants of the proposed algorithm are investigated for solving practical model-based X-ray CT image reconstruction problems. Experimental results show that the proposed algorithm significantly accelerates the convergence of X-ray CT image reconstruction with negligible overhead and greatly reduces the noise-like OS artifacts in the reconstructed image when using many subsets for OS acceleration. For light field reconstruction, considering decomposing the camera imaging process into a linear convolution and a non-linear slicing operations for faster forward projection, we propose to reconstruct light field from a sequence of photos taken with different focus settings, i.e., a focal stack, using an alternating direction method of multipliers (ADMM). To improve the quality of the reconstructed light field, we also propose a signal-independent sp

关键词： Model-based X-ray CT Image Reconstruction Convex Optimization iterative algorithm Augmented Lagrangian Variable Splitting Electrical Engineering Engineering

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Channel estimation iterative algorithm for OFDM systems based on windowed fourth Discrete Cosine Transform

Channel estimation iterative algorithm for OFDM systems base...

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International Conference on Information Science and Engineering (ICISE)

作者： Chengchao Sun Fanxin Zeng Liang Guo Zhenyu Zhang Department of Information Engineering Chongqing Communication College Chongqing China

The Pilot-Symbol Assisted Modulation (PSAM) is an usual channel method for OFDM systems. On the basis of Windowed the fourth Discrete Cosine Transform (WDCT-IV), a new channel estimation iterative algorithm for OFDM systems is proposed. By exploiting the characteristics of iterative detection, the proposed algorithm inhibits the additive white Gaussian noise (AWGN) and inter-carrier interference (ICI) more effectively. Simulation result shows that the technique is effective and the system performance is better than one of Ref.[11] under the multipath fading channels.

关键词： OFDM Channel estimation Discrete cosine transforms Interference iterative methods iterative algorithm Mobile communication

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European Market Coupling algorithm incorporating clearing conditions of block and complex orders

European Market Coupling Algorithm incorporating clearing co...

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IEEE Eindhoven PowerTech Conference

作者： Grigoris A. Dourbois Pandelis N. Biskas Department of Electrical and Computer Engineering Aristotle University of Thessaloniki Greece

In this paper an algorithm for the solution of the European electricity market coupling is presented, considering all block and complex orders available in the European Power Exchanges. The model takes into account the clearing conditions of profile and regular block orders, linked block orders, exclusive group of block orders and flexible hourly orders, as well as the clearing conditions of Minimum Income Condition and Load Gradient orders, possibly under a scheduled stop condition. The model considers also hourly flow ramping constraints on single interconnections or group of interconnections, net position ramping constraints, interconnection losses and tariffs. The flow-based approach is implemented, using the zonal PTDF matrix. The algorithm eliminates possible paradoxically accepted block and MIC orders within an iterative process. The proposed algorithm is evaluated in a pan-European day-ahead electricity marketplace.

关键词： European electricity market Block and complex orders iterative algorithm Mixed integer linear programming

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Security-Constrained Nodal-Based Clearing of the European Day-Ahead Electricity Market Formulated as a MILP Model

Security-Constrained Nodal-Based Clearing of the European Da...

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IEEE Eindhoven PowerTech Conference

作者： Dimitris I. Chatzigiannis Pandelis N. Biskas Anastasios G. Bakirtzis Department of Electrical and Computer Engineering Aristotle University of Thessaloniki Thessaloniki GREECE

In this paper a nodal-based approach is evaluated for the clearing of the pan-European day-ahead electricity market. In the proposed mathematical formulation, the widely used in European Power Exchanges (PXs) profile block orders are explicitly modeled, whereas the full set of inter-zonal and intra-zonal normal and security (N-1) transmission constraints is incorporated. The proposed approach is evaluated using a real-world power system, the Balkan power system, and the economic and computational aspects of the proposed methodology are thoroughly discussed.

关键词： European electricity market Block orders N-1 security criterion iterative algorithm

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iterative algorithm for Optimal Fiducials Under Weak Perspective Projection

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INTERNATIONAL JOURNAL OF IMAGING SYSTEMS AND TECHNOLOGY 2009年第1期19卷 27-36页

作者： Bruckstein, Alfred M. Holt, Robert J. Netravali, Arun N. Technion Israel Inst Technol Dept Comp Sci IL-32000 Haifa Israel Lucent Technol Bell Labs Murray Hill NJ 07974 USA

In previous work, we designed space fiducials with the aim of making camera pose determination as noise-insensitive as possible. These fiducials turned out to be sets of points that formed concentric regular polyhedra. Here, we apply an idea of Dementhon and Davis and test and analyze an iterative linear algorithm in conjunction with our optimal fiducials to increase the accuracy of the computed camera pose. We also analyze under what circumstances this iterative algorithm is guaranteed to converge to the correct solution. Comprehensive computer simulations illustrate the behavior of the algorithm and the degree of improvement in pose determination in case of convergence. (C) 2009 Wiley Periodicals, Inc. Int J Imaging Syst Technol, 19, 27-36, 2009;Published online in Wiley InterScience (***). DOI 10.1002/ima.20175

关键词： iterative algorithm fiducials weak perspective computer vision

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The Design and Implementation of a Symmetric Encryption algorithm Based on DES

The Design and Implementation of a Symmetric Encryption Algo...

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5th IEEE International Conference on Software Engineering and Service Science (ICSESS)

作者： Zhou Yingbing Li Yongzhen Yanbian Univ Dept Comp Sci & Technol Yanji 133002 Peoples R China

ISBN: (纸本)9781479932795

In this age of explosive growth in information exchanges, there is indeed no time at which security does not matter. One of the symmetric encryption algorithms, DES, has kept its dominant position in the area of data encryption over the last few decades. However, with a rapid development in the field of computer hardware, DES has already been proved insecure. It takes a short time to translate the ciphertext to its corresponding plaintext using brute-force method at a reasonable cost. This is mainly due to the small key size DES employed. Given these issues, the objective of this article is to suggest an alternative on DES to obtain higher security and better execution efficiency by increasing the key size and updating the iteration technique. Comparisons were conducted with both DES and the advanced DES named triple DES (3DES). The results have demonstrated that the proposed algorithm outperforms both previous algorithms.

关键词： DES key expansion iterative algorithm

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