重庆东环传输网的规划与建设

基于重庆东环传输网的规划及建设过程介绍，着重对设备选型和网络结构优化进行了论述。     

DAWL: A Delayed-ACK Scheme for MAC-Level Performance Enhancement of Wireless LANs

The IEEE 802.11 MAC protocol provides a reliable link layer using Stop & Wait ARQ. The cost for high reliability is the overhead due to acknowledgement packets in the direction opposite to the actual data flow. In this paper, the design of a new protocol as an enhancement of IEEE 802.11 is proposed, with the aim of reducing supplementary traffic overhead and increasing the bandwidth available for actual data transmission. The performance of the proposed protocol is evaluated through comparison with IEEE 802.11 as well as with a SSCOP-based protocol. Results underline significant advantages of the proposed protocol against existing ones, thus confirming the value and potentiality of the approach.Dzmitry Kliazovich received his Masters degree in telecommunication science from Belarusian State University of Informatics and Radioelectronics in 2002. He is currently working towards the Ph.D. degree in University of Trento, Italy. His main research interest lies in wireless networking field with a focus on performance optimization and cross-layer design.Fabrizio Granelli was born in Genoa in 1972. He received the “Laurea” (M.Sc.) degree in Electronic Engineering from the University of Genoa, Italy, in 1997, with a thesis on video coding, awarded with the TELECOM Italy prize, and the Ph.D. degree in Electronic Engineering and Computer Science from the same university in 2001. Since 2000 he is carrying on his teaching activity as Assistant Professor at the Dept. of Information and Communication Technologies (DIT) of the University of Trento (Italy) within the B.Sc. and M.Sc. Degrees in Telecommunications Engineering.The research interests of Dr. Granelli are mainly focused on networking, with particular attention to network modeling and performance evaluation, wireless networks, access control, and next-generation telecommunication networks.He is author of more than 30 refereed papers, published in several international journals and conferences.Dr. Granelli is member of the IEEE Committee on “Communication Systems Integration and Modeling” (CSIM) and of the Technical Programme Committee of the “QoS and Performance Evaluation Symposium” of the International Conference on Communications (ICC 2003 and ICC 2004).     

高效能接入网络助电信运营商从互联网价值链获益

面对成为互联网流量管道供应商的尴尬,运营商需要构建一张具有以下特征的高能效接入网：高带宽（每用户达到50M甚至更高）、低延时、成本最优化的全IP宽带接入;采用可以同时满足家庭宽带用户、商业用户和移动基站回程等应用的统一融合的接入网平台;具有用户/业务/应用智能感知功能来保障正确的流量处理。高效能接入网将帮助运营商成为急速增长的高附加值互联网内容产业链的一部分。     

求解Job shop的一种快速混合算法

结合车间调度问题本身的特点,采用关键路径块邻域结构,混合禁忌搜索算法和粒子群优化算法,设计了一种快速混合调度算法.该算法对预选择的块邻域解的性能进行快速估计,对不可行解尽早舍去,大大减小了邻域解的搜索空间.仿真结果表明,该算法在求解平均时间和性能方面均具备明显优势.     

优化EPON对本地P2P业务承载能力的研究

P2P流量已成为网络中的主要流量,但现有EPON系统不能很好的承载本地P2P业务.文中从MPCP协议的角度对逻辑链路标签及其过滤规则进行扩展,使本地P2P数据包不需经OLT端二层交换即可实现下行转发,从而大大改善了P2P业务的QoS.并以此方案为基础,提出改进EPON的DBA算法,设置专门的P2P时隙,实现P2P业务的全光域转发.两种方案的建模仿真结果表明,两者均能明显改善EPON对本地P2P业务的承载能力.     

Robust common visual pattern discovery using graph matching

Discovering common visual patterns (CVPs) between two images is a difficult and time-consuming task, due to the photometric and geometric transformations. The state-of-the-art methods for CVPs discovery are either computationally expensive or have complicated constraints. In this paper, we formulate CVPs discovery as a graph matching problem, depending on pairwise geometric compatibility between feature correspondences. To efficiently find all CVPs, we propose a novel framework which consists of three components: Preliminary Initialization Optimization (PIO), Guided Expansion (GE) and Post Agglomerative Combination (PAC). PIO gets the initial CVPs and reduces the search space of CVPs discovery, based on the internal homogeneity of CVPs. Then, GE anchors on the initializations and gradually explores them, to find more and more correct correspondences. Finally, to reduce false and miss detection, PAC refines the discovery result in an agglomerative way. Experiments and applications conducted on benchmark datasets demonstrate the effectiveness and efficiency of our method.     

叶茂水电站施工组织设计的优化

论述在优化叶茂水电站施工组织设计中：简化临建设施、缩短施工准备期的措施；对过水围堰及其防洪标准的选择；场内外交通及供风、供水、供电方式；砂石系统优化和混凝土拌和系统布局；弃碴场利用等。并提出施工期取水及环境保护应计入概预算中。     

Design of high-speed two-stage cascode-compensated operational amplifiers based on settling time and open-loop parameters

Settling behavior of operational amplifiers is of great importance in many applications. In this paper, an efficient methodology for the design of high-speed two-stage operational amplifiers based on settling time is proposed. Concerning the application of the operational amplifier, it specifies proper open-loop circuit parameters to obtain the desired settling time and closed-loop stability. As the effect of transfer function zeros has been taken into account, the proposed methodology becomes more accurate in achieving the desired specifications. Simulation results are presented to show the effectiveness of the methodology.     

基于H.264的视频传输系统的设计与实现

针对H.264协议在视频通信中的应用,对基于H.264协议的视频传输系统的结构和功能构成进行了说明,对H.264编解码器的设计实现方法和优化策略进行了阐述,重点说明了该设计实现中H.264编码器的算法级优化和代码级优化的优化策略,以及H.264编解码算法中图像分片的优化控制方法。通过多组标准化测试序列测试结果的比较,分析了优化算法的编码速度和视频压缩质量。     

A Typology for Multi-Technology, Multi-Service Broadband Network Synthesis

Current technological possibilities for implementing multi-service networks include both single technology ATM or IP networks and multi-technology networks such as SONET-based or flat networks. However, regardless of the technology employed, the synthesis problem – to optimally route traffic and divide the network's transmission resources between its virtual links – remains of prime importance.In this paper, we review, compare, and classify the extensive recent literature concerning multi-service network synthesis methods. In order to do this, we propose a typology based on switching and control strategies and a general notation that reflects the layered nature of the network. Technology independent mathematical models describe the various, essentially different, approaches presently found in the literature.