数字存储示波器特性与应用

带宽和采样速率是数字存储示波器的两个重要技术指标,通过对其特性的分析,说明了它们在实际工程应用中的作用以及应注意的问题。     

基于HTTP协议的大规模软件发布技术

软件发布技术是企业管理软件的核心技术,而大规模软件发布技术的核心在于合理的体系结构和有效的带宽控制技术。通过Web Service体系、断点续传和带宽控制技术的综合应用,实现了易于部署,可以实现动态带宽控制的大规模软件发布系统。     

Application of a new explicit‐rate ABR traffic controller

In broadband integrated communication systems, the classical method of max–min fair‐rate allocation for traffic control does not support the weighted‐rate guarantee. The weighted‐rate guarantee is necessary for available‐bit rate (ABR) service models. This fact motivates that the weighted max–min (WMM) fair‐rate allocation for the ABR traffic is widely studied. However, the combination of close‐loop feedback control with WMM algorithm has not appeared in the previous research. In this paper, a practical WMM fair‐rate allocation model is proposed. This scheduling scheme combines and integrates the congestion avoidance using proportional control (CAPC) and the weighted max–min fair‐rate allocation. This model is designed to achieve higher utilization and also bounded delay for ABR traffic flow control. In the system under analysis, the performance of this new weighted traffic scheduler is evaluated. The system presented in this paper is also compared with WMM and CAPC methods. Copyright © 2001 John Wiley & Sons, Ltd.     

基于单模光纤的可调谐声光滤波器

从模式转换效率、带宽和波长调谐范围等角度分析了普通单模光纤中声光模式转换的性质 ,并在实验上实现了插入损耗小于 0 1dB ,带宽小于 1nm ,调谐范围大于 30nm的光纤声光滤波器。     

一种基于星上处理的卫星ATM网络动态带宽分配策略

本文提出了一种基于星上处理的卫星ATM网络的动态带宽分配方案,它通过对流量的估计动态申请带宽,卫星作为控制中心根据链路利用情况来分配带宽,仿真结果表明,相对于现有的的方法,它可以保持链路效率,提高业务的服务质量,同时这种方法对星上资源要求不高,易于实现。     

一种新颖的WDM网波长转换器

本文首次提出了利用周期性热及电场诱导的D型光纤的波长转换器.推导了转换效率η和转换带宽Δλ的表达式,该式与数值计算一致.结果表明,η与二次非线性系数和泵浦光功率成对数关系,但它们对Δλ的影响不大.适当增加D型光纤的长度能有效提高η,但却降低了Δλ.一般情况下,η＞-15dB,Δλ＞100nm.模拟了WDM网中8个信道信号光的波长转换.     

关于算术级数中Lehmer D H数的整除性

探讨了算术级数中Lehemr DH数的整除性问题,并给出了相应的渐近公式。     

Unitary matrix modulation with splitting over the coherence bandwidth for OFDM in a single antenna system

Recently, unitary matrix modulation (UMM) has been investigated in multiple antenna systems which is called unitary space‐time modulation (USTM). In an OFDM, different channel delay profiles and path strengths bring different frequency selective patterns. Therefore, OFDM system can potentially provide a diversity at the frequency selective fading due to the different channel delay profiles. When we consider only the diagonal components of UMM with splitting over the coherence bandwidth, the system can obtain a frequency diversity in a single antenna, since the channel response of the diagonal components of UMM that split over the coherence bandwidth shows to be totally different. In this paper, we propose the diagonal components of UMM/OFDM with splitting over the coherence bandwidth (UMM‐S/OFDM) in a single antenna. The proposed system can obtain the frequency diversity with splitting the diagonal components of UMM/OFDM over the coherence bandwidth. Therefore, the proposed system with a single antenna can obtain good BER performance like the USTM/OFDM with two antennas. Copyright © 2006 John Wiley & Sons, Ltd.     

基于RSVP的一种QoS智能路由算法

定义了路径的带宽碎片函数和网络效益两个优化函数,并根据业务连接的时延、带宽特性,将其分为窄带连接和宽带连接两类.提出一种基于Hopfield神经网络的公平接入QoS路由算法,此算法具有并行性、实时性和鲁棒性,并用性能仿真结果表明本算法的公平性和有效性.     

安徽建筑工业学院校园网建设规划

安徽建筑工业学院校园网作为学院的基础设施 ,应遵循网络的设计原则。网络布线采用结构化布线 ,主干网选择快速以太网 ,网络系统应易于扩充、升级、管理和使用 ,满足现代教育技术的发展