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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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algorithm for Time-Domain Steady-State Analysis of Electrical Machines Accounting for Saturation

Algorithm for Time-Domain Steady-State Analysis of Electrica...

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International Symposium on Electrical Machines (SME)

作者： Radzik, Michal Sobczyk, Tadeusz J. State Higher Vocat Sch Tech Inst Nowy Sacz Poland Cracow Univ Technol Inst Electromech Energy Convers Krakow Poland

ISBN: (纸本)9781538603598

Taking into account saturation of electrical machine's magnetic circuit is still a problem when circuit models are used. Steady-states are usually determined in such cases by numerical integration of the machine dynamic equations in time long enough. The paper presents a method which allows finding steady-state solutions directly in time domain. The method is presented along with computational example for a simple electromechanical converter.

关键词： AC machines periodic steady-state analysis discrete differential operator time domain analysis iterative algorithm

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Usage of Inductive algorithms for Building a Search Results Ranking Model Based on Visitor Rating Evaluations 13

Usage of Inductive Algorithms for Building a Search Results ...

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13th IEEE International Scientific and Technical Conference on Computer Sciences and Information Technologies (CSIT)

作者： Zosimov, Viacheslav Bulgakova, Oleksandra VO Sukhomlynsky Mykolaiv Natl Univ Dept Appl Math & Informat Comp Technol Mykolaiv Ukraine

ISBN: (纸本)9781538664636

The article describes the building of the search results ranking model based on the user evaluation of web resource quality and usability. Such ranking models are subjective for each user. This is achieved due to the fact that the main influence on the model has the user's trust rank for the expert's evaluation on which basis it is built. To determine the trust rank, the generalized iterative algorithm of the group method of data handling was applied, which has already showed high accuracy in the experiments on building Google ranking model.

关键词： Inductive modeling GMDH iterative algorithm search results ranking

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algorithm for improved iterative image reconstruction

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Dianzi Yu Xinxi Xuebao/Journal of Electronics and Information Technology 2004年第10期26卷 1626-1630页

作者： Zhang, Zhao-Tian Zhang, Peng Institute of Automation Chinese Academy of Sciences Beijing 100080 China Capital Normal University Beijing 100037 China

An Improved iterative Reprojection Reconstruction (IIRR) from a view of integral equation for incomplete image reconstruction is presented. IIRR is convergence under L2 norm. The convergent velocity and the error of the reconstructed image depend on the relaxed parameter, the detected data and some prior information on image. The reconstructed image can be expressed in term of a series of image reconstructed by the detected data. Numerical simulation also shows that IIRR is effective to image reconstruction.

关键词： Image reconstruction Incomplete data iterative algorithm

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A Method to Compute the Sparse Graphs for Traveling Salesman Problem Based on Frequency Quadrilaterals 12th

A Method to Compute the Sparse Graphs for Traveling Salesman...

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12th International Frontiers of algorithmics Workshop (FAW)

作者： Wang, Yong Remmel, Jeffrey North China Elect Power Univ Beijing 102206 Peoples R China Univ Calif San Diego San Diego CA 92093 USA

ISBN: (纸本)9783319784557;9783319784540

In this paper, an iterative algorithm is designed to compute the sparse graphs for traveling salesman problem (TSP) according to the frequency quadrilaterals so that the computation time of the algorithms for TSP will be lowered. At each computation cycle, the algorithm first computes the average frequency (f) over bar (e) of an edge e with N frequency quadrilaterals containing e in the input graph G(V, E). Then the 1/3 vertical bar E vertical bar edges with low frequency are eliminated to generate the output graph with a smaller number of edges. The algorithm can be iterated several times and the original optimal Hamiltonian cycle is preserved with a high probability. The experiments demonstrate the algorithm computes the sparse graphs with the O(nlog(2)n) edges containing the original optimal Hamiltonian cycle for most of the TSP instances in the TSPLIB. The computation time of the iterative algorithm is O(Nn(2)).

关键词： Traveling salesman problem Probability model Frequency quadrilateral iterative algorithm Sparse graph

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Error reduction of amplitude digital Fourier transform holograms by use of a pre-iterative process

Error reduction of amplitude digital Fourier transform holog...

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International Conference on Optical Engineering for Sensing and Nanotechnology (ICOSN 2001)

作者： Shimomura, T Chhetri, BB Yang, S Kyushu Inst Technol Tobata Ku Kitakyushu Fukuoka 8048550 Japan

ISBN: (纸本)081944121X

It is well known that the iterative stepwise quantization algorithm is very powerful for the optimization of amplitude digital Fourier transform holograms. We suggest a pre-iterative process to uniform the histogram distribution of the Fourier transform of the input image in order to reduce the reconstruction error of amplitude digital Fourier transform holograms. Simulation results show that the reconstruction error can be reduced much when our pre-iterative process is used in the iterative stepwise quantization algorithm.

关键词： digital holography iterative algorithm stepwise quantization pre-iterative process

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Research on Service Scanning Supervision Technology Based on Improved Association algorithm 3

Research on Service Scanning Supervision Technology Based on...

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3rd IEEE International Conference on Electrical Engineering, Big Data and algorithms, EEBDA 2024

作者： Shang, Qingqing Liu, Chao Li, Jiwei Ren, Liwei Zhang, Xinyi Jia, Zhen Jiang, Yuchen Liu, Haitao State Grid Information & Telecommunication Branch Beijing China State Grid Zhejiang Electric Power Co. Ltd. Lishui Power Supply Company Zhejiang Lishui China

ISBN: (纸本)9798350380989

The scale of data in the Internet environment is becoming increasingly large and complex. Its heterogeneous, dynamic and distributed information characteristics have caused the existing business scanning and monitoring models to be unable to meet its application needs. This project proposes an improved iterative algorithm based on multiple servers. By introducing the idea of local operation of memory nodes, a service scanning and monitoring model that can support concurrency is constructed. A cluster analysis method based on genetic algorithm based on cluster analysis is proposed. It is then synthesized to correlate the largest set of recurring items to achieve data association, extend the iterative service scanning supervision algorithm, and obtain user-interested implicit patterns from server logs. At the same time, personalized service purposes are achieved by recommending implicit interest collections to users. Simulation results show that this method can effectively improve the performance of business search monitoring, and has the characteristics of enhancement as the data size increases. © 2024 IEEE.

关键词： iterative algorithm local computing parallel algorithm Web data association

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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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Phase-Controlled Beam-Scanning with Near-Field and DRR Reduction for Arbitrary Antenna Arrays

Phase-Controlled Beam-Scanning with Near-Field and DRR Reduc...

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2010 IEEE International Symposium Antennas and Propagation/CNC-USNC/URSI Radio Science Meeting

作者： Buttazzoni, G. Vescovo, R. Univ Trieste Dipartimento Elettrotecn Elettron & Informat I-34127 Trieste Italy

ISBN: (纸本)9781424449682

The authors proposed an iterative algorithm for the phase-controlled power synthesis of beam scanning arrays of arbitrary geometry, with simultaneous reduction of the maximum electric field amplitude in a near field region of interest and of the dynamic range ratio of the excitations. The presented example demonstrates the effectiveness of the proposed algorithm.

关键词： antenna arrays antenna arrays dynamic range ratio reduction electric fields iterative algorithm iterative methods maximum electric field amplitude reduction near field reduction phase controlled beam scanning phase controlled power synthesis

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Spectrum Allocation Scheme Based on Stackelberg Game in Two-tier HetNet 13

Spectrum Allocation Scheme Based on Stackelberg Game in Two-...

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13th IEEE International Conference on Signal Processing (ICSP)

作者： Dai, Jing Lv, Wei Ye, Fang Harbin Engn Univ Coll Informat & Commun Engn Harbin Heilongjiang Peoples R China China United Network Commun Ltd Heilongjiang Branch Harbin Heilongjiang Peoples R China

ISBN: (纸本)9781509013456

As the explosive growth of wireless date requirements, heterogeneous network (HetNet) has become an effective solution for improving the system performance such as the throughput. The femtocells are always arranged to share the spectrum with the macro base stations (MBSs). Thus, the co-channel interference leads to the degradation of the HetNet throughput. In this paper, we discuss the program of spectrum reuse in the two-tier HetNet, and the problem is defined as a Stackelberg game approach. The MBS is play as a leader and it releases a part of spectrum resource for femtocells to avoid intertier interference. And the femtocells provide services to fractional macro users (MUEs) in return. Therefore, the throughput can be improved by the reduction of the inter-tier interference. Compared with the former works, the prominent characteristic of the method in the paper is that the benefit relation between the leader and followers is not measured by the real money. Furthermore, considering the system throughput specifically, we define the utility of the femto base stations (FBSs) by the average throughput as same as the utility of the MBS, which is used to improve the overall throughput of the system. Moreover, the gradient descent algorithm is also applied to compute the Nash equilibrium as the range of variables become continuous. The simulation results indicate that the proposed algorithm can observably reduce the interference and enhance the throughput of the network.

关键词： Stackelberg Game HetNet spectrum reuse iterative algorithm

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