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检索条件"机构=Dep. Computer Technology Engineering"

共 351 条记录，以下是281-290 订阅

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Channel assignment and routing in multi-channel, multi-interface wireless mesh networks

Channel assignment and routing in multi-channel, multi-inter...

引用

2010 2nd International Conference on computer engineering and technology, ICCET 2010

作者： He, Pingshi Xu, Ziping Dep. of Computer Application Technology Institute of Command Automation PLAUST Nanjing China Dep. of Telecommunication Engineering Institute of Communication Engineering PLAUST Nanjing China

ISBN: (纸本)9781424463503

Each node equipped with multiple interfaces in multi-channel wireless mesh networks can increase the network throughput when applied to appropriate channel assignment and routing protocols. In this paper, we analyze the channel assignment and channel switching problems in WMN where the number of interfaces is smaller than the number of channels. Ripple effect caused by channel switching is presented. The method to restrict the distance of ripple effect and to balance the load among channels is given. We also advance the Weighted Expected Residual Transmission Rate (WERTR) - a load-aware routing metric - to select a best quality route which is suitable for use with our proposed channel assignment strategy. © 2010 IEEE.

关键词： MESH networking

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QoS-based unequal frame protection for video streaming

QoS-based unequal frame protection for video streaming

引用

2010 International computer Symposium, ICS 2010

作者： Chang, Ching-Lung Kang, Huan-Yao Dep. of Computer Science and Info. Engineering National Yunlin University of Science and Technology Taiwan

ISBN: (纸本)9781424476404

Following with the advancements in digitization technology and broadband communication technology, real-time video streaming service has become an essential one for next generation Internet. When transmitting compressed video across the Internet, however, one of the main challenges is packet error/loss. High coding dep.ndencies among video frames suffer from vulnerability to packet loss, which impacts the playback quality of video stream. Losing an important frame may cause a set of frames loss or damage as well. In this paper, we propose an effective important frame decision scheme in which the playback quality is considered. The results of this paper can be applied to the unequal frame protection scheme which targets to improve the video playback quality with minimal frame protection overhead. ©2010 IEEE.

关键词： Video streaming

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The decision scheme of frame importance factor for video streaming system

The decision scheme of frame importance factor for video str...

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International Conference on Broadband, Wireless Computing, Communication and Applications

作者： Kang, Huan-Yao Chang, Ching-Lung Dep. of Computer Science and Info. Engineering National Yunlin University of Science and Technology Taiwan

ISBN: (纸本)9780769542362

Following with the advancements in digitization technology and broadband communication technology, real-time video streaming service has become an essential one for next generation Internet. When transmitting compressed video across the Internet, however, one of the main challenges is packet error/loss. High coding dep.ndencies among video frames suffer from vulnerability to packet loss, which impacts the playback quality of video streaming. Losing an frame importance may cause a set of frames loss or damage as well. In this paper, we propose an effective important frame decision scheme in which the playback quality is considered. The results of this paper can be applied to the unequal frame protection scheme which targets to improve the video playback quality with minimal frame protection overhead. © 2010 IEEE.

关键词： Video streaming

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Path capacity of multi-channel multi-hop IEEE 802.11 wireless networks with channel switching

Path capacity of multi-channel multi-hop IEEE 802.11 wireles...

引用

2010 3rd IEEE International Conference on computer Science and Information technology, ICCSIT 2010

作者： He, Pingshi Xu, Ziping Qi, Wangdong Yang, Xia Dep. of Computer Application Technology Institute of Command Automation PLAUST Nanjing China Dep. of Telecommunication Engineering Institute of Communication Engineering PLAUST Nanjing China Institute of China Electronic System Engineering Company China

ISBN: (纸本)9781424455386

The capacity problem is one of the main issues in researching the multi-channel IEEE 802.11 wireless networks. In this paper, we analyze the path capacity of the multi-channel wireless networks by estimating the RTS, CTS and the packet loss rate of the wireless links and calculating the average service time of the packet sending. We also analyze the channel assignment and channel switching problems and present the Neighborhood Channel Concentration Degree (NCCD) mechanism which can distribute network load into the available channels and increase the total throughput of the network. We use ns-2 as the simulator to simulate the network throughput using our NCCD and compare with the throughput of the MCR mechanism. The results show that NCCD can significantly increase the network throughput. © 2010 IEEE.

关键词： Packet networks

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Generalized direct power control for grid connected multilevel converters

Generalized direct power control for grid connected multilev...

引用

IEEE-ICIT 2010 International Conference on Industrial technology, ICIT 2010

作者： Rivera, Sebastián Kouro, Samir Cortés, Patricio Alepuz, Salvador Malinowski, Mariusz Wu, Bin Rodríguez, José Dep. of Electronics Engineering Universidad Técnica Federico Santa María Valparaiso Chile Dep. of Electrical and Computer Engineering Ryerson University Toronto ON Canada Dep. of Electronics Engineering Technical University of Catalonia Barcelona Spain Institute of Control and Industrial Electronics Warsaw University of Technology Warsaw Poland

ISBN: (纸本)9781424456970

This paper presents a generalized direct power control (DPC) scheme for grid connected multilevel converters. The proposed method extends the original DPC operating principle by considering only for selection the closest vectors to the present switching state. This approach requires the power derivatives for feedback, which can present numerical implementation problems in real time. Therefore a grid virtual flux based observer is proposed to overcome this issue. The proposed method is applicable to any multilevel converter topology of any number of levels. In this paper simulations results are presented for a 9 level cascaded H-bridge converter. The proposed solution enables DPC for multilevel converters used in medium voltage applications while improving overall power quality and efficiency of the system. ©2010 IEEE.

关键词： Power converters

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Study on a novel DC/DC converter based on interleaved parallel

Study on a novel DC/DC converter based on interleaved parall...

引用

2nd International Workshop on Intelligent Systems and Applications, ISA2010

作者： Xin, Yibo Wu, Xin Fang, Huajing Dep.of Control Science and Engineering HuaZhong University of Science and Technology Wuhan China Dep. of Electrical Engineering and Automation Luoyang Institute of Science and Technology Luoyang 471023 China Dep.of Computer and Information Engineering Luoyang Institute of Science and Technology Luoyang China

ISBN: (纸本)9781424458745

This paper introduces the design of the parallel connection of DC/DC power supplies. The topology of system configuration and performed modeling were stated. The problems such as the ripple electric current sharing of parallel connected DC power modules, and the circuit and the working mode of the DC/DC modules, the configuration of the parallel connection and their solutions were discussed .The system control strategy were analyzed and simulated based on MATLAB/Pspice. The experimental results verify that the parallel connection of DC/DC power is suitable for the low-voltage high-current output DC-DC converter. ©2010 IEEE.

关键词： DC-DC converters

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Face detection based on feature analysis and edge detection against skin color-like backgrounds

Face detection based on feature analysis and edge detection ...

引用

International Conference on Genetic and Evolutionary Computing

作者： Huang, Deng-Yuan Lin, Ta-Wei Ho, Chun-Ying Hu, Wu-Chih Department of Electrical Engineering Dayeh University Changhua Taiwan Dep. of Computer Science and Information Engineering National Penghu University of Science and Technology Penghu Taiwan

ISBN: (纸本)9780769542812

In this paper, we propose a method of face detection based on feature analysis and edge detection against skin colorlike backgrounds. The proposed method consists of three phases including image preprocessing, skin color segmentation, and determination of face candidates. First, the objects in foreground are separated by image preprocessing. Second, the non-skin color objects are rejected by the method of skin color segmentation. Finally, both the elimination of skin color-like blobs in backgrounds and face detection are performed by the method of determination of face candidates. Experimental results show that the proposed method can effectively detect most of faces in skin color-like backgrounds. In addition, detection of face images with pose and expression variations or against dark backgrounds are also carried out. © 2010 IEEE.

关键词： Face recognition

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Using fuzzy modeling to describe power system QV curve

Using fuzzy modeling to describe power system QV curve

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作者： Wang, Shu-Chen Wu, Chi-Jui Department of Computer and Communication Engineering Taipei College of Maritime Technology Taipei Taiwan Dep. of Electrical Engineering National Taiwan University of Science and Technology Taipei Taiwan

ISBN: (纸本)9789604741748

This paper presents the fuzzy modeling approach to the description QV curve of power system for analysis of voltage stability. Voltage instability of power system comes from increasing load rapidly, and causes bus voltage to drop. When voltage is out of control and it can be voltage collapse. The QV curve can identify voltage stability limit, and it determine robustness of power system. The method of fuzzy modeling has been proven to be well-suited for modeling nonlinear industrial processes described by input-output data. In view of the nonlinear characteristic of the QV curve, the method of fuzzy modeling is employed for representing the curve. The fuzzy system model is basically a collection of fuzzy IF-THEN rules that are combined via fuzzy reasoning for describing the features of a system under study. Based on the Sugeno-type fuzzy model, various models with different numbers of modeling rules are used to describing the QV curve. It is found that such fuzzy model offers both quantitative and qualitative descriptions for the QV curve.

关键词： Electric power system stability

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Design of modal insensitivity for generator via Eigenstructure Assignment

Design of modal insensitivity for generator via Eigenstructu...

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ISBN: (纸本)9789604742332

This paper presents the design of modal insensitivity for the synchronous generator in a power system using Eigenstructure Assignment. In the proposed design procedure, modal insensitivity of generator is achieved by assigning system eigenstructure and only algebraic computations are involved. Model insensitivity means that the concerned system mode shape is insensitive to small variations in the system. From the simulation results of the study in a single-machine-infinite-bus system are certified. It is found that the system damping has been greatly improved. The proposed design has improved on the sensitivity.

关键词： Synchronous generators

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Analysis of extensive power factor by FPGA under power quality disturbance

Analysis of extensive power factor by FPGA under power quali...

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ISBN: (纸本)9789604741748

This paper used six formulas for power factor measurement, and they will be different according to the characteristics of load. The power quality is more and more serious, because a lot of information technology equipments and power electric converters were used in recent years. Harmonic and load unbalance can affect the measurement result of power factor of utility. The Fast Fourier Transform (FFT) is used to analyze the six formula of power factor. The simulation system was modeled in Hardware Description Language (VHDL) and some novel IP (intellectual property) cores, such as CORDIC core and FFT core by the way of Bottom-Up. The technology of semiconductor was more and more maturely. Design of SOC (System On a Chip) is a trend to achieve the strong and small volume in the future. The measurement data were employed to calculate active, reactive and apparent power. The average error rate of our design is about 0.05%.

关键词： Field programmable gate arrays (FPGA)

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