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检索条件"丛书名=电子工程与计算机科学"

共 178 条记录，以下是151-160 订阅

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Simulation on multi-path fading in wireless channel

Simulation on multi-path fading in wireless channel

引用

2012 International Conference on Computer Science and Electronic Engineering(2012 IEEE计算机科学与电子工程国际会议 ICCSEE 2012)

作者： Ma DongLin Lai Fansheng Sun Jie Lanzhou University of Technology Lanzhou China

The wireless channel has characteristics of multipath fading effect and time-varying in the mobile communication. Among them the multi-path fading effect is quite large for the performance of the system. Because the transmission environment is very complex, we use digital signal process to analyze propagation characteristic in wireless channel through MATLAB. This paper is mainly discussed several typical fading which are simulated using frequency transform methods through the computer. The performance of the multi-path fading channel in the mobile communication is studied by comparing BER, constellation map and eye-diagram. According to the different power of the multi-path signals, the simulations of different fading types and depths have been conducted.

关键词： multi-path fading Matlab simulation

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The Quantitative Model of User Interests based on Web Log

The Quantitative Model of User Interests based on Web Log

引用

2012 International Conference on Computer Science and Electronic Engineering(2012 IEEE计算机科学与电子工程国际会议 ICCSEE 2012)

作者： Yongquan Qiu Guoyuan Lin School of Computer Science and Technology CUMT Xuzhou China

Based on user interests, the personalized service has become a popular research in academic and commercial *** paper analyzes the user interests in the domestic and foreign research *** come up with a way to obtain the User Interests data in Web log mining. What's more, in order to solve the dynamic updating user interests. This paper proposes a new quantitative model of user interests.

关键词： Web log mining user interests Quantitative model individuation

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Research of Analog Circuit Fault Diagnosis Based on Data Fusion Technology

Research of Analog Circuit Fault Diagnosis Based on Data Fus...

引用

2012 International Conference on Computer Science and Electronic Engineering(2012 IEEE计算机科学与电子工程国际会议 ICCSEE 2012)

作者： WU SU JIANG YANNI Department of Electronic Engineering Navy University of Engineering Wuhan China

For the solution of insufficient test data and single information can not represent all the fault state in the analog circuit fault diagnosis, a fault diagnosis model and .a fusion algorithm based on data fusion technology is formed. The fault diagnosis information is fused with two layers: For the feature layer, the voltage and current of testing nodes are processed by different neural network in order to acquire BPA ofvarious faults. For the decision layer, ultimate result is acquired by D-S evidence theory. The results of simulation show that: Comparing with the result from the network as single fusion layer, this method has a smaller error and higher diagnosis reliability.

关键词： fault diagnosis data fusion analog circuit neural network D-S evidence theory

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OpenMP Application in TM-based Parallel Program

OpenMP Application in TM-based Parallel Program

引用

2012 International Conference on Computer Science and Electronic Engineering(2012 IEEE计算机科学与电子工程国际会议 ICCSEE 2012)

作者： Ying Liu Fuxiang Gao College of Information Science and Engineering Northeastern University Shenyang China

To solve the synchronization problems in the parallel programming, such as dead lock, priority inversion and convoy, the concept of transactional memory(TM) had been introduced. In this paper, some basic concepts about TM are presented at first, and several key implementation technologies arc analyzed. Then some typical TM systems are introduced in detail. Finally, the examples using OpenTM or Intel C++ STM Compiler Prototype Edition which are the extensions of OpenMP are given.

关键词： transactional memory HTM STM OpenMP OpenTM

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The Grid Parallel Computing in Information Retrieval Research and Application

The Grid Parallel Computing in Information Retrieval Researc...

引用

2012 International Conference on Computer Science and Electronic Engineering(2012 IEEE计算机科学与电子工程国际会议 ICCSEE 2012)

作者： Dong-Wei Zhang-Jing Chen-Xu computer department Shijiazhuang university shijiazhuang china

this paper describes in detail construction of The Grid Parallel Computing of books and documents, system solves the problems and methods, as well as design to realization of MDS module. Scientific data grid software adopt SOA, through the standardization of metadata and metadata-based resource discovery to make users can be achieved uniform access to distributed heterogeneous data resources in two phases of query.

关键词： Grid Information Retrieval Metadata MDS

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Feature Label Extraction of Online Video

Feature Label Extraction of Online Video

引用

2012 International Conference on Computer Science and Electronic Engineering(2012 IEEE计算机科学与电子工程国际会议 ICCSEE 2012)

作者： Fudong Sun Minyong Shi Weiguo Lin Communication University of China Beijing China

This paper proposes online video feature label extraction method during the time when they were retrieved from the Internet This method is used in an online video retrieving system to extract feature labels of a video clip automatically. By collecting attributes of videos, basic features are produced, and then capture the key frames of video. Create label templates, analyze and extract other features by matching the image analysis result in the template library to decide the feature labels of the online video clips.

关键词： video attribute image analysis label template

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Performance evaluation of turbo product codes over the PPM-based satellite optical channel

Performance evaluation of turbo product codes over the PPM-b...

引用

2012 International Conference on Computer Science and Electronic Engineering(2012 IEEE计算机科学与电子工程国际会议 ICCSEE 2012)

作者： Huixi Liao Qingjun Zhang Liying Tan Zhonghua Yang China Academy of Space Technology Beijing China 100094 China Academy of Space Technology Beijing China 100094 National Key Laboratory of Tunable Laser Technology Harbin Institute of Technology Harbin China 150

Atmospheric turbulence produces fluctuations in the irradiance of the transmitted optical beam, which is known as atmospheric scintillation, severely degrading the link performance. Turbo product codes (TPC) has attracted much attention for its high coding rate and strong abilities of defeating long burst errors, which is a good choice for the highly correlated optical channel. In this paper, a scheme combining turbo product codes (TPC) and pulseposition modulation (PPM) has been analyzed for the temporally correlated satellite-to-ground optical channel with an avalanche photodiode (APD) receiver and Gaussian ther- mal noise. The results indicate that TPC is capable of defeating long burst errors and it can offer enough temporally diversity for the free-space optical communication (FSOC) system.

关键词： atmospheric turbo product codes satellite-to-ground optical communications

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Research on Fault Diagnosis of Mixed-signal Circuits Based on Genetic Algorithms

Research on Fault Diagnosis of Mixed-signal Circuits Based o...

引用

2012 International Conference on Computer Science and Electronic Engineering(2012 IEEE计算机科学与电子工程国际会议 ICCSEE 2012)

作者： Shangcong Feng Xiaofeng Wang School of Reliability & System Engineering Beijing University of Aeronautics and Astronautics Beijing China

As the fault modes of mixed-signal circuits growing, aiming at the features for its signal are both analog and digital amount, the paper analyzed that the fault diagnosis program of mixed-signal circuits with genetic algorithms by using SABER simulation method to inject faults and data collection based on a brief discussion of basic principles and operation of genetic algorithms, focused on consideration for the fitness functions of genetic algorithms, and then selected an optimization genetic algorithm to a specific airborne DC converter circuit's fault diagnosis, verifying the effectiveness of the method, provided a new diagnostic method for mixed-signal circuits.

关键词： mixed-signal circuits fault diagnosis genetic algorithms SABER simulation fitness function

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A Threshold-based Rate Optimization Algorithm for Image Transmission

A Threshold-based Rate Optimization Algorithm for Image Tran...

引用

2012 International Conference on Computer Science and Electronic Engineering(2012 IEEE计算机科学与电子工程国际会议 ICCSEE 2012)

作者： Yanrong Yuan Chundi Xiu Hualiang Zhu Department of Electronics and Information Engineering Beijing University of Aeronautics and Astronautics 100191 Beijing China

An optimal bit rate allocation algorithm for image compressed with SPIHT is proposed. A threshold-based transmission scheme of SPIHT bit streams and a rate optimization algorithm based on threshold after analyzing the characteristics of SPIHT bit stream are developed in this paper. Simulation results show that, the proposed technical solution is better than the traditional bit stream allocation schemes in terms of the packet number used to decode and PSNR of reconstructed image. Therefore, the scheme is more potential and practical for future efficient and reliable wireless multimedia communication systems.

关键词： Image transmission joint source-channel coding set partitioning in hierarchical trees (SPIHT) rate optimization

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A G-Octree Based Fast Collision Detection for Large-Scale Particle Systems

A G-Octree Based Fast Collision Detection for Large-Scale Pa...

引用

2012 International Conference on Computer Science and Electronic Engineering(2012 IEEE计算机科学与电子工程国际会议 ICCSEE 2012)

作者： Runtao Xu Lin Kang Hongcheng Tian Institute of Computing Technology Beijing Jiaotong University Beijing China Special police academy of China Beijing China Network Research Center Tsinghua University Beijing China

Particle system has long been a topic of research and has many applications. However, due to its complexity, the fast collision detection between particles and scene geometry is still a bottleneck for real-time or interactive applications. As a fuzzy system, visually correct is more important than physical accuracy at most time for particle system. In this paper, considering its simplicity, we propose to use a simplified version, which can be generated by any simplification method, to approximate the boundary of original scene mesh. We proposed a GOctree acceleration structure to subdivide the scene space, combining the advantages of both the uniform grid and octree. The resultant G-Octree based agent is uploaded onto GPU to implement a parallel particle system. An encoding scheme is introduced to pack the hierarchical G-Octree structure into a flat 2D texture to exploit the optimized performance of texture memory system on GPU context Compared with existing methods, the proposed method has potential to handle complex scene in practical applications. The experiments verify its effectiveness.

关键词： Particle systems GPU G-Octree Texture encod-ing

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