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检索条件"主题词=Software Algorithms"

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Optimization of Iterative Physical Optics Method through CPU-GPU Heterogeneous Technology

Optimization of Iterative Physical Optics Method through CPU...

引用

International Applied Computational Electromagnetics Society Symposium (ACES)

作者： Qian Cao Yuanguo Zhou Qiang Ren Minxuan Li College of Communication and Information Engineering Xi’an University of Science and Technology Xi’an China School of Electronic and Information Engineering Beihang University Beijing China China Electronic Product Reliability and Environmental Testing Institute Guangzhou China

ISBN: (数字)9798350355581

ISBN: (纸本)9798350355598

With the rapid advancement of radar technology, electromagnetic simulation has found widespread applications across various fields. When solving for the Radar Cross Section (RCS) of electrically large scattering bodies using the Iterative Physical Optics Method (IPO), the number of unknowns is significant, leading to substantial memory usage and computation time. To address this issue, this paper constructs an IPO method based on parameter space for computing the RCS of electrically large radar targets and introduces CUDA parallel computing (Compute Unified Device Architecture) technology to achieve parallel computation on heterogeneous CPU-GPU platforms. Compared with commercial software, a speedup of 137.79× is achieved on an NVIDIA GeForce RTX 3050 GPU. The exemplary results demonstrate the feasibility and efficiency of the CPU-GPU heterogeneous parallel IPO algorithm, enabling the resolution of scattering problems for electrically large targets that previously could only be tackled on high-performance computers or computer clusters.

关键词： Computers Radar cross-sections Spaceborne radar software algorithms Physical optics Graphics processing units Clustering algorithms Parallel processing software Radar applications

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News Recommendation Based on Content Fusion of User Behavior

News Recommendation Based on Content Fusion of User Behavior

引用

International Symposium on Computational Intelligence and Design, ISCID

作者： Lin Li Li Wang School of Computer Software University of Science and Technology Liaoning Anshan China

ISBN: (数字)9781728184463

ISBN: (纸本)9781728184470

To address the problem that content-based recommendation algorithm lacks diversified user interests, a news recommendation algorithm based on content fusion user behavior is proposed. Firstly, the content-based algorithm is used to improve the computation of user interest weights by considering the effect of time on user interest and to discover users' own preferences. Secondly, considering the time utility and the correlation between the popularity of the news and users' interests, finding users' nearest neighbors using content- based and improved behavior-based mixed similarity to discover their potential preferences. Finally, the user's own preferences are fused with potential preferences to generate a recommended list. The experimental result shows that compared to the traditional recommendation algorithm, the improved algorithm has a maximum increase of 9. 80% in recommendation accuracy, a maximum increase of 10. 12% in recall, and a maximum increase of 6. 23% in diversity. The experimental result shows that the improved recommendation algorithm effectively improves the quality of recommendation, enrichs diversity, and has good recommendation effect.

关键词： Collaborative filtering Heuristic algorithms software algorithms Time factors Systems architecture Recommender systems Training

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Servo Drive with PWM Controller Simulation

Servo Drive with PWM Controller Simulation

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Annual Siberian Russian Workshop on Electron Devices and Materials (EDM)

作者： Vladislav D. Popov Yuriy V. Shornikov Dmitry N. Dostovalov Department of Automated Control Systems Novosibirsk State Technical University Novosibirsk Russia Department of Automated Control Systems Novosibirsk State Technical University Institute of Automation and Electrometry of the Siberian Branch of the Russian Academy of Sciences Novosibirsk Russia

ISBN: (数字)9798350389234

ISBN: (纸本)9798350353051

The simulating of a servo drive with symmetrical pulse width controlling is implemented by the ISMA platform. This task is classified as an event-continuous or hybrid system. Since the dynamic processes can be event-driven, the finite-state machine notation by D. Harel (statechart as formalism) is applied to build a mathematical model for the problem. The statechart with three states complying the Cauchy problem is designed, predicates for directed transitions, as well as states equations are defined. The original LISMA language, combining both block and textual coding, which allows to form compact models that correspond bijectively to statechart formalism used for event-driven continuous systems, is applied. A fragment of the LISMA language grammar for determining the states and transitions of hybrid systems is presented. The designed ISMA software is resolved by original explicit and semi-explicit numerical methods with the asymptotic algorithm for event detection, included to the ISMA library. Computer experiments demonstrate good results with sufficient accuracy.

关键词： Analytical models Computational modeling software algorithms Pulse width modulation Mathematical models software Libraries

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Intelligent Automatic Layout of One-line Diagrams for District Electrical Distribution Network

Intelligent Automatic Layout of One-line Diagrams for Distri...

引用

IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)

作者： Ruixing Lin Jialei Xing Honggeng Yang Wenbo Chen School of Electrical Engineering and Information Sichuan University Chengdu China Substation Operation Work Area Ningbo Electric Power Bureau Ningbo China

A novel method of intelligent automatic layout of one-line diagrams for district electrical distribution network is proposed in this paper. Initially, a set of aesthetic criteria ("distributing of substation diagrams evenly in the frame\minimum line\limited crossings") have been introduced. Further, a modified particle swarm optimization algorithm is presented to search the best layout of one-line diagrams, which is based on simple substation wiring diagrams as placement modules and good layout frame design and practical wiring method. In this algorithm, a series of improvements are applied to maintain the population diversity in the earlier search, and gradually transfer to the later local search. The global performance is clearly improved. Diagrams generated with this method are aesthetically 'pleasing' and 'readable' and 'understandably'. The method has been programmed and applied to automatic voltage control (AVC) system in some district electrical distribution network.

关键词： Intelligent networks Substations Wiring Layout Graphical user interfaces software algorithms Particle swarm optimization Automatic voltage control Routing Electronic mail

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Efficient search and mode prediction algorithms for motion estimation in H.264/AVC

Efficient search and mode prediction algorithms for motion e...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Gwo-Long Li Mei-Juan Chen Hung-Ju Li Ching-Ting Hsu Department of Electrical Engineering National Dong Hwa University Hualien Taiwan

ISBN: (纸本)0780388348

The H.264 video coding standard adopts different coding schemes like variable block sizes and multiple reference frames for motion estimation. Hence, H.264/AVC provides gains in compression efficiency of up to 50% over a wide range of bit rates and video resolutions compared to previous standards. However, these features incur a considerable increase in encoder complexity, mainly with regards to motion estimation and mode decision. In this paper, efficient methods aimed at speed up of motion estimation and mode decision are proposed. Experimental results show that our proposed algorithms can save a coding time of about 88% compared with the reference software JM80 while keeping the video quality.

关键词： Prediction algorithms Motion estimation Automatic voltage control Video compression Image coding Video coding Bit rate software algorithms software quality Image quality

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algorithms and algorithm analysis of logical difference operation of variable precision upper approximation operator and grade lower approximation operator

Algorithms and algorithm analysis of logical difference oper...

引用

International Conference on Networking and Digital Society, ICNDS

作者： Xianyong Zhang Coll. of Math. & Software Sci. Sichuan Normal Univ. Chengdu China

ISBN: (纸本)9781424451623;9781424451616

The aim of this contribution is to construct new operation of approximation operators, and explore its calculation. It proposes logical difference operation of variable precision upper approximation operator and grade lower approximation operator. Then regular algorithm and structural algorithm are proposed and analyzed, and furthermore it obtains an important conclusion that structural algorithm has advantages in space complexity. Finally the new operation and its algorithms are illustrated by a medical example.

关键词： Approximation algorithms Algorithm design and analysis Quantization software algorithms Set theory Probabilistic logic Educational institutions Mathematics Technological innovation Humans

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A robust NLMS algorithm with a novel noise modeling based on stationary/nonstationary noise decomposition

A robust NLMS algorithm with a novel noise modeling based on...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Akihiko Sugiyama NEC Common Platform Software Research Laboratories Kawasaki Japan

ISBN: (纸本)9781424423538

This paper proposes a robust NLMS algorithm with a novel noise modeling based on stationary/nonstationary noise decomposition. The ambient noise including the near-end signal is modeled as a weighted sum of the stationary and the nonstationary components. These components are independently estimated with an appropriate time constant for better accuracy. The estimates are weighted by the stationary/ nonstationary likelihood before summation. The integrated noise estimate controls the coefficient adaptation stepsize such that it is an upward convex function of the reference input with a noise offset for robustness. Evaluations in a fullband and a subband echo cancellation scenarios show that ERLE has been improved by as much as 40 dB over the algorithm with a conventional noise model in both single- and double-talk sections with no double-talk detection.

关键词： Noise robustness Adaptive filters Noise cancellation Echo cancellers software algorithms Robust control Microphone arrays System identification National electric code Laboratories

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Verifying compositional designs for scenario-based timing specifications

Verifying compositional designs for scenario-based timing sp...

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International Symposium on Object-Oriented Real-Time Distributed Computing

作者： Li Xuandong Zhao Jianhua Gong Jiayu Shi Yaoxin Zheng Guoliang State Key Laboratory of Novel Software Technology Department of Computer Science and Technology Nanjing University Nanjing Jiangsu China

In this paper, we use networks of UML statechart diagrams to model compositional designs for real-time systems, and present an algorithm for checking networks of statechart diagrams for the scenario-based specifications expressed by UML sequence diagrams with timing constraints. The algorithm is based on investigating the reachability graph of the integer state space of a network of statechart diagrams

关键词： Timing Unified modeling language Real time systems Laboratories Computer science Algorithm design and analysis software algorithms State-space methods Labeling

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Battery power optimized encryption

Battery power optimized encryption

引用

IEEE International Conference on Communications (ICC)

作者： S. Bapatla R. Chandramouli Multimedia System Networking and Communications (MSyNC) Laboratory Department of Electrical and Computer Engineering Stevens Institute of Technology USA

Computational power optimization is crucial in the battery power limited secure wireless mobile networks. Therefore, in this paper, we (a) introduce a hardware/software set-up to measure and model the battery power consumption of different encryption algorithms through real-life experimentation and (b) compute optimal power (number of rounds) allocation for encrypting packets such that the constraints on power and security are met. We present the results for three block ciphers: DES, IDEA, and COST though the same analysis can be extended to the other ciphers such as AES, RC4, etc. A new measure called "vulnerability" that quantifies the success of linear cryptanalysis attack is proposed and its relationship with the power consumption is explored. Two mathematical optimization problems are then posed: (a) compute the optimal power allocation to encrypt each packet such that the vulnerability is minimized subject to a total power constraint and (b) to compute the optimal number of encryption rounds for each packet such that a total power constraint is met. The differences in these two formulations are presented. A closed form solution to the first problem is derived while the second optimization formulation is posed as an integer program and is solved numerically. Several numerical results are also provided.

关键词： Cryptography Power measurement Energy consumption Computer networks Communication system security Mobile computing Hardware Battery charge measurement software measurement software algorithms

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Application of Mode Filtering in Near-Field Measurements

Application of Mode Filtering in Near-Field Measurements

引用

International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Zhipeng Zhang Mingwei Hu Bing Wei School of Physics Xidian University Xi'an China

ISBN: (数字)9798350353129

ISBN: (纸本)9798350353136

This paper briefly introduces the theory of planar near-field measurement and applies cylindrical mode filtering to correct errors in planar near-field measurements. This method decomposes the far-field pattern obtained from planar near-field measurements into cylindrical wave modes. By exploiting the spatial constraint relationship between the cylindrical wave spectrum and the tested antenna, scattering components are filtered out. Finally, the processed far-field pattern is obtained through cylindrical wave spectrum to far-field transformation. By measuring a horn antenna, the algorithmically processed directional pattern is compared with the pattern from simulation software. The results indicate that the algorithm effectively reduces the impact of scattering errors on the far-field pattern.

关键词： Antenna measurements Antenna theory Horn antennas Measurement uncertainty software algorithms Scattering Transforms software Filtering theory software measurement

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