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Switch Scale Evaluation for Optical Cross-Connects Considering Add/Drop Ratio Restriction

Switch Scale Evaluation for Optical Cross-Connects Consideri...

引用

Asia Communications and Photonics Conference and Exhibition(2010亚洲光纤通信与光弹博览会及研讨会 ACP 2010)

作者： Ryosuke Hirako Kiyo Ishii Hiroshi Hasegawa Ken-ichi Sato Dept.Of Electrical Engineering and Computer Science Nagoya University Furo-cho Chikusa-ku Nagoya 464-8603 Japan

ISBN: (纸本)9780819485564

We evaluate switch scales for several single-layer and hierarchical optical cross-connects. With introducing practical waveband add/drop ratio bounds that can be derived through recently developed network design algorithms, switch scale is shown to be significantly reduced. We identify the most cost-effective switch architectures by applying practical parameter values.

关键词： Algorithms Fiber to the home Optical networks

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A New MAC Scheme in Cognitive Network for Different Priority of Secondary Users

A New MAC Scheme in Cognitive Network for Different Priority...

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2010 The IET 3rd International Conference on Wireless,Mobile & Multimedia Networks(第三届IET无线移动及多媒体网络国际会议 ICWMMN 2010)

作者： Lei Wang Xiao Zhou Yang Xiao Shaohai Hu Guangzhi Qu Kiseon Kim Institute of Information Science Beijing Jiaotong University Beijing China Dept.of Engineering and Computer Science Oakland University Rochester MI48309 USA Dept.of Information and Communications Gwangju Institute of Science and Technology Gwangju 500-712

ISBN: (纸本)9781617822629

The cognitive networks need the flexible utilization of the spectrum and bandwidths, without impacting the licensed Users(also called Primary Users, PU). While the cognitive radio network Media Access Control (MAC) layer is required not only to provide traditional services but also to perform an entirely new function for effective using the available bandwidths for the unlicensed users called Secondary Users (SU). To solve the problem, this paper develops a new MAC scheme that allows unlicensed users adaptively select spectrum, and it supports the QoS of high priority unlicensed users. The proposed MAC protocol offers differentiated access through the SUs' parameters setting AIFS[AC], CWmin[AC], CWmax[AC]. Each AC is equipped with a transmitting queue. Simulations verify the proposed MAC scheme for cognitive networks.

关键词： Cognitive Radio IEEE 802.22 MAC PU SU throughput rate delay

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Performance Analysis of Explicit Control Protocol (XCP)

Performance Analysis of Explicit Control Protocol (XCP)

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2010 The IET 3rd International Conference on Wireless,Mobile & Multimedia Networks(第三届IET无线移动及多媒体网络国际会议 ICWMMN 2010)

作者： Shaohai Hu Yang Xiao Lili Song Pengxuan Mao Guangzhi Qu Kiseon Kim Institute of Information Science Beijing Jiaotong University Beijing China Dept.of Engineering and Computer Science Oakland University Rochester MI48309 USA Dept.of Information and Communications Gwangju Institute of Science and Technology Gwangju 500-712

ISBN: (纸本)9781617822629

Mathematical analysis of current congestion control algorithms [1, 2] reveals that, as the delay-bandwidth product (BDP) increases, TCP becomes more oscillatory and prone to instability, regardless of the queuing scheme. To address this problem, a novel approach to Internet congestion control is developed recently. This new eXplicit Control Protocol (XCP) delivers the highest possible application performance over a broad range of network infrastructure, including extremely high speed and very high delay links that are not well served by TCP. We analyze the performance of XCP and make comparation with TCP. Extensive simulations show that XCP achieves fair bandwidth allocation, high utilization, small standing queue size, and near-zero packet drops, with both steady and highly varying traffic. In this paper, we investigate the XCP in deep sight;also present a simple network in which XCP is locally stable but globally unstable in the presence of latency. The simulation results verify that XCP remains fairness, high utilization for future high bandwidth-delay product network.

关键词： XCP TCP congestion control delay-bandwidth product

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Spatial Multiplexing Algorithms of Cognitive Base-Stations

Spatial Multiplexing Algorithms of Cognitive Base-Stations

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2010 The IET 3rd International Conference on Wireless,Mobile & Multimedia Networks(第三届IET无线移动及多媒体网络国际会议 ICWMMN 2010)

作者： Yang Xiao Ying-kang Zhang Guangzhi Qu Kiseon Kim Institute of Information Science Beijing Jiaotong University Beijing China Dept.of Engineering and Computer Science Oakland University Rochester MI48309 USA Dept.of Information and Communications Gwangju Institute of Science and Technology Gwangju 500-712

ISBN: (纸本)9781617822629

The existing cognitive network can not provide the spatial sectors for a cell, since the base-station (BS) has one omnidirectional antenna. Thus it is impossible for a base-band channel to be shared by several mobile stations(MSs) with one omni-directional antenna. To solve the problem, this paper proposes the spatial multiplexing algorithms for transmitter and receiver of cognitive BS. In the proposed scheme, the cognitive BS has a uniform circular array (UCA) with 8 elements, it can provide five nearly orthogonal sectors for MSs, and a base-band channel can be shared by 5 sectors, but the MS has one omni-directional antenna only, and simple transmitter and receiver. The experimental results verify that the proposed algorithms are able to increase the cellular capacity to nearly 5 times with low co-channel interference, and the co-channel interference also can be canceled by LDPC codec.

关键词： Index Terms— UCA Cognitive Network Cell sectorization SDMA

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CSMA/CA-based MAC Protocol in Cognitive Radio Network

CSMA/CA-based MAC Protocol in Cognitive Radio Network

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2010 The IET 3rd International Conference on Wireless,Mobile & Multimedia Networks(第三届IET无线移动及多媒体网络国际会议 ICWMMN 2010)

作者： Shaohai Hu Xiaoli Liu Yang Xiao Yanchang Liu Guangzhi Qu Kiseon Kim Institute of Information Science Beijing Jiaotong University Beijing China Dept.of Engineering and Computer Science Oakland University Rochester MI48309 USA Dept.of Information and Communications Gwangju Institute of Science and Technology Gwangju 500-712

ISBN: (纸本)9781617822629

Different from the MAC of IEEE 802.11, the application of IEEE 802.22 suffers the uncertain spectrum and frequency width, which can not ensure the access of mobile users to be valid. To solve the problem, in this paper, we modify the CSMA/CA mechanism in order to make it suit the Cognitive Radio environments, in which the spectrum can be effectively used. We validate the modification by numerical analysis.

关键词： Cognitive Radio IEEE 802.22 MAC CSMA/CA throughput rate

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Adaptive Initial Quantization Parameter Selection for H.264/SVC Rate Control

Adaptive Initial Quantization Parameter Selection for H.264/...

引用

2010 IEEE International Conference on Intelligent Computing and Intelligent Systems(2010 IEEE 智能计算与智能系统国际会议 ICIS 2010)

作者： Jin Yang Shixin Sun Yu Sun Christopher S.Kline School of Computer Science and Engineering University of Electronic Science and Technology of China Dept.of Computer Science Uni.of Central Arkansas 201 Donaghey Ave. Conway AR 72034 USA

Initial quantization parameter (QP) selection is critical for the overall performance of video rate control. In this paper, we propose an adaptive initial QP selection algorithm for H.264/AVC Scalable Extension (SVC) rate control. The proposed algorithm introduces a number of efficient methods, including a coding complexity measure for intraframes, and a rate~complexity-quantization (R-C-Q) model to accurately determine initial QPs for H.264/SVC rate control. Our experimental results demonstrate that, the proposed initial QP selection algorithm outperforms the one of JVT-W043 rate control scheme, adopted in the H.264/SVC reference software, by providing more accurate initial QP prediction, reducing buffer overflow/undertow, depressing quality fluctuations, and finally, improves the overall coding quality by up to 0.48dB.

关键词： Rate control Scalable video coding H.264/SVC

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A Study of Power Saving LED Back Light Module

A Study of Power Saving LED Back Light Module

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2010亚洲光电子会议LED和显示技术分会场

作者： Yi-Chin Fang Jyh-Cheng Yu Cheng-Mu Tsai Cheng-Hsien Huang Advanced Optical Design and Manufacture Center Institute of Electro-Optical EngineeringNational Kaohsiung First University of Science and Technology Dept.of Mechanical and Automation Engineering National Kaohsiung First University of Science and Technology Dept.of Computer and Communication Kun Shan University

LED play the role at such the kind of modern display light source thanks to its power consumption and the most important,outstanding colour *** displays are required to be much thinner and thinner with best colour *** have manipulated the pattern distribution of the micro features to obtain the required optical characteristics.A light guide plate(LGP) of 3.5 inch dimension using an LED light source is used as an example for the study of integrated *** research designs a piece of light guide film(LGF) at the back of *** may induct the exterior light,and enables the backlight module to achieve the energy *** addition,the special-designed light pipe and freeform optics will induce external light,which will contribute 15% power savings.

关键词： backlight module,light guide plate,LED,uniformity,Taguchi method,Principal component analysis

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A 3D Topology model for Multiple Topological Representations based on Combinatorial Maps

A 3D Topology model for Multiple Topological Representations...

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The 18th International Conference on Geoinformatics(第18届国际地理信息科学与技术大会 Geoinformatics 2010)

作者： Mingguang WU Yongning WEN TaiSheng CHEN Jingwei SHEN Bai Guimei Key Laboratory of Virtual Geographic Environment (Ministry of Education) Nanjing Normal UniversityN Dept.of Computer Science and Information Engineering Luoyang Institute of Science and Technology Luo

ISBN: (纸本)9781424473014

The formal representation of topological relations plays a very important role in process of spatial query, spatial analysis and spatial reasoning. Most current models support a single representation of geometry and topology at a fixed resolution. While it often happens that different applications take into consideration spatial data/topological relationship, with the same 3D scene date, under different viewpoints, in different geometric forms and/or with different resolutions. In this case, a topology model for multiple topological representations is needed. In this paper, we propose a new approach based on combinatorial maps, which focus on both multiple topological representations under the situation of LOD and Feature semantic/spatial aggregation and the consistency of topology.

关键词： Topology Data model:Multiple topological representation:3D Combinatorial Maps

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Steeper Action Potential Duration Restitution Slope Increases Risk of Ventricular Fibrillation:A Simulation Study

Steeper Action Potential Duration Restitution Slope Increase...

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The 4th International Conference on Bioinformatics and Biomedical engineering(第四届IEEE生物信息与生物医学工程国际会议 iCBBE 2010)

作者： Yi Zheng Daming Wei Zuxiang Fang Dept.of Electronic Engineering Fudan University Shanghai People’s Republic of China Graduate Scho Graduate School of Computer Science and Engineering University of Aizu Aizu-Wakamatsu Fukushima 9 Dept.of Electronic Engineering Fudan University Shanghai People’s Republic of China

Action potential duration restitution(APDR) is thought to be relevant to the stability of cardiac electrophysiology. Ventricular fibrillation (VF) was simulated using the Wei-Harumi model by taking into account piecewise linear action potential duration restitution based on clinical findings. We found, in the simulation, that heart model with steeper slope of APDR required less ectopic stimuli to trigger VF. This result suggested that the APDR may affect cardiac vulnerability to VF.

关键词： Fibrillation Computational modeling Piecewise linear techniques Stability computer simulation computer science Heart rate variability Cardiovascular diseases Industrial accidents Cancer

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DCT Kernel Based Finite Discrete Gabor Expansion and Transform Implemented by Filterbanks

DCT Kernel Based Finite Discrete Gabor Expansion and Transfo...

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The 2010 International Conference on computer Application and System Modeling(2010计算机应用与系统建模国际会议 ICCASM 2010)

作者： Juan-juan Gu Liang Tao Jun Zhang Dept.of Electronic Information & Electrical Engineering Hefei University Hefei Anhui 230022 China School of Computer Science and Technology Anhui University Hefei Anhui 230039 China

ISBN: (纸本)9781424472352

DCT kernel based finite discrete Gabor expansion (DGE) and discrete Gabor transform (DGT) implemented by filterbanks are presented. An analysis filterbank is designed for the finite DGT and a synthesis filterbank is designed for the finite DGE. The parallel channel in each of the two filterbanks has a unified structure and can apply the fast DCT (discrete cosine transform) algorithm to reduce its computational load. The computational complexity of each parallel channel is very low and is independent of the oversampling rate of the DGT. The computational complexity of the proposed parallel method is analyzed and compared with that of the existing major parallel algorithms for the finite DGT and DGE. The results show that the proposed parallel implementation of the DCT kernel based finite DGE and DGT is attractive for real time signal processing.

关键词： finite discrete gabor expansion finite discrete gabor transform filterbank oversapling rate DCT kernel

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