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检索条件"丛书名=电子工程与计算机科学系列"

共 178 条记录，以下是91-100 订阅

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J2EE-based Online Video Retrieving System Design and Implementation

J2EE-based Online Video Retrieving System Design and Impleme...

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： Haoran Yang Weiguo Lin College of Computer Science Communication University of China Beijing China

Most video contents on the Internet are regularly watched online, but it is also necessary for users to download them to local storage for further processing. Currently, many online video websites provide their own service for website specific video retrieving;it is difficult to build an integrated web retrieving system adapted for all online video website due to different protocols. This paper presents an online video address discovery and retrieving system which supports multiple online video protocols and formats, parallel retrieving task scheduling;vast amounts of unstructured data and video file storage management, it is suitable for integration in high load, large scale enterprise applications to provide video retrieving service.

关键词： Online video retrieving Address Discovery HTTP Proxy

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3D FEM Calculation for Electric Field of Aluminum Electrolysis Cell Based On Ansys

3D FEM Calculation for Electric Field of Aluminum Electrolys...

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： Zhengjie Lu Senkai Lu Department of Physics and Electronic Engineering Hechi University Yizhou China Institute of Materials Physics Guilin Normal College Guilin China

The mathematical models of electric field of the 300 kA aluminum electrolysis cells were calculated with ANSYS. The result revealed that the potential of the each part of the aluminum electrolysis cell was higher at the center and lower at the edge, decreasing from top to bottom. Molten aluminum was similar to equipotential areas, and the voltage drop of the electrolyte is largest. The current of the each parts of the aluminum electrolysis cell flowed from the middle to the both sides, from the top to the bottom. The X horizontal currents of the melt were anti-symmetric along the long axis (X axis), the Y horizontal currents of the melt were anti-symmetric along the short axis t (Y axis) . The voltage drop of the cell was measured and compared with the calculated results. The current efficiencies for the anode change patterns achieved in real cells were in excellent agreement with the model instability predictions. So the software ANSYS can well reflects actual status of the electric fields of the cells and can be used to design them.

关键词： aluminum electrolysis cell ANSYS electric field

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A Simplified Peak Cancellation Method for OFDM Signals

A Simplified Peak Cancellation Method for OFDM Signals

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： Yaqian Huang Zhibin Zeng Engineering Research Center of Digital Audio & Video Ministry of Education Communication University of China Beijing China

A main drawback of OFDM systems is the high peak-toaverage Power Ratio (PAPR) which can result in significant distortion when transmitted through power amplifiers. The conventional peak cancellation method (cPCM) is widely used in PAPR reduction, but for OFDM signals, the cPCM is of high complexity. In this paper, a simplified peak cancellation method (sPCM) is proposed for OFDM signals, which obtains a low computational complexity and equivalent performance in PAPR reduction.

关键词： PAPR Peak cancellation EVM

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Research on MPPT Technique in Photovoltaic Power Generation System

Research on MPPT Technique in Photovoltaic Power Generation ...

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： Qiang Fu Nan Tong College of Science and Technology Ningbo University Ningbo China

Maximum power point tracking CMPPT) is the core technique in photovoltaic power generaton system to improve energy utilization. Major research direciotns of MPPT are focused on model pattern and input-output paramerters pattern. This paper introduces the superiority and inferiority for MPPT in two kind of patterns. Morever, a new MPPT method in model pattern base on ant colony optimization algorithm(ACO) and an optimized fuzzy tracking method in input-output paramerters pattern are also proposed, which aer proved to tracking the maximum power point (MPP) effectively from experimental results. Finally, combined with advantages of the above tracking methods, a set of integral tracking strategy is put forward to accurately and timely track MPP under different conditions.

关键词： maximum power point tracking (MPPT) swarm intelligence fuzzy algorithm tracking strategy

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Explanation of Sha-3 Algorithm By the Third Round Activities

Explanation of Sha-3 Algorithm By the Third Round Activities

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： Fang Pang Lili Liu School of Computer Science and Technology China University of Mining and Technology CUMT Xuzhou China

On Dec. 10, 2010, the NIST declares the fore five algorithms for SHA-3 competition : Keccak, Skein, JH, Grostl, BLAKE. In this paper, we introduce the five candidates. The news extension. of BLAKE uses the Mode of LAKE. Grostl follows the design principles of *** uses the cycle structure of SPN. Keccak adopts the sealing sponge structure. SKEIN is a one-way function which is extended from the design of Threefish group password. After introducing and comparing the five candidates, we made a list of their respective characteristics.

关键词： SHA-3 Candidate algorithms comparison

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Adaptive Postfiltering for Quality Enhancement of AVS-M Coded Music

Adaptive Postfiltering for Quality Enhancement of AVS-M Code...

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： Kai Meng Jing Wang Zuo Wang Jingming Kuang School of Information and Electronics Beijing Institute of Technology Beijing China

An adaptive postfiltering algorithm for enhancing the quality of coded music is presented for the AVS-M decoder. The postfilter consists of a long-term postfilter in cascade with a short-term postfilter section and includes spectral tilt compensation and automatic gain control. The long-term module emphasizes periodic harmonics and attenuates the spectral valleys between periodic harmonics. We use the autocorrelations to indicate the degree of the harmonics and only when the harmonic degree beyond a given threshold the long-term module will be adopted. The short-term module, on the other hand, emphasizes music formats and attenuates the spectral valleys between formats. Unlike earlier postfilters which generally introduced a substantial amount of muffing to the output audio signal, our postfilter significantly reduces this effect by minimizing the spectral tilt in its frequency response. As a result, this postfilter achieves noticeable noise reduction while introducing only minimal distortion in the output music of AVS-M.

关键词： A VS-M postfilter short-term long-term

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Loading and Rendering XFile in DirectX

Loading and Rendering XFile in DirectX

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： Jianbing Xiahou Yang Mu Software School of Xiamen University Xiamen China

Using C++, we implement XFile loading based on DirectX, then generate three-dimensional mesh with the information of XFile and render it at last. And with further research on progressive mesh, we achieve controlli... 详细信息

关键词： DirectX XFile 3D Mesh

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A Crest Factor Reduction Method in Digital Predistortion for Improvement of Power Efficiency

A Crest Factor Reduction Method in Digital Predistortion for...

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： Zhibin Zeng Yaqian Huang Dian Xie Engineering Research Center of Digital Audio & Video Ministry of Education Communication University Engineering Research Center of Digital Audio & Video Ministry of Education Communication University

Digital predistortion, which is used to compensate for the nonlinearity introduced by power amplifiers, plays an important role in the linearization techniques. Saturation distortions caused by high peak-to-average ratio of input signal, however, cannot be compensated through digital predistortion. As a result, power amplifiers have to operate with back-off and result in relatively low efficiency. In this paper, a new pulse cancellation method of crest factor reduction technique is proposed which can considerably increase power efficiency without power back-off by reducing the high peak-to-average ratio. Simulation results show that using PCM method of CFR prior to DPD can achieve not only a desirable linearization performance, but also a significant increase in power level.

关键词： Power Amplifier, Digital Predistortion Crest Factor Reduction Pulse Cancellation Method

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Design and Implement of Attendance Management System Based on Contactless Smart IC Card

Design and Implement of Attendance Management System 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： Shouhao Geng Guangming Li Wei Liu School of Mechanical Electrical & Information Engineering Shandong University at Weihai Shandong Weihai China

An Attendance Management System (AMS) based on TCP/IP protocol is designed and realized. This paper expounds the principle of the RFID reader device in AMS, its hardware and software design. The reader device takes ARM LM3S9B90 as the core and Philips's MFRC531 as the transceiver chip of RFID reader. In application, the system works stable and has good real-time performance.

关键词： RFID TCP/IP protocol ARM Attendance Management System (AMS)

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A Decision-making Method Using Knowledge-based Machine Learning

A Decision-making Method Using Knowledge-based Machine Learn...

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： Qing Zhou Zhijian Huang The Software Institute Zhongshan University Guangzhou Guangdong 510275 P.R.China Information Center Shenzhen Huachengfeng Industrial Company Limited Shenzhen Guangdong 518057 P.R

This paper discusses how to use knowledge in machine learning, so that decision-making with knowledgebased machine learning can be obtained. Objectives, anti-objectives and it is support of decisions are formally defined;and the knowledge base, evidence base, sample base and qualified samples for decision problem are discussed in details. This paper discusses the uncertainty in the dicision problem with a method of how to use knowledge for measuring the supports of our objectives form knowledge in our hands. Three functions, namely: the initial evaluation function, sample evaluation function, making the evaluation function are proposed.

关键词： machine learning decision-making initial evaluation function sample evaluation function decision evaluation function

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