城域传输网络结构与发展分析

根据目前城域传输网络的业务特点与结构特点,分析了扁平型、分层型和特大型等三大类特点鲜明的城域传输网络,针对各类网络架构的特点、适用情况、存在问题,进行了针对性分析,对于网络优化思路和网络演进进行了探讨。     

TD-SCDMA网络规划方法的探讨

本文首先介绍了TD-SCDMA的技术特点,结合技术特点分析了TD-SCDMA的规划特点、网络演进策略,并与WCDMA进行了对比.最后提到TD-SCDMA规划相关的一些问题,如站址选取、规划工具现状等.     

FA光纤定位技术之流派浅析

目前业界有几种FA(fiber Array)定位技术流派。本文从制作光纤阵列中各种用于光纤定位的结构特点出发,着重探讨了U型槽和V型槽两种主流光纤定位方法的特点,具体包括两种定位槽的加工特点、定位结构特点、精度比较、制作光纤阵列的可靠性特点分析等,提出了基于光纤阵列器件可靠性观点的认知。     

FA光纤定位技术之流派浅析

目前业界有几种FA（fiber Array）定位技术流派。本文从制作光纤阵列中各种用于光纤定位的结构特点出发,着重探讨了U型槽和V型槽两种主流光纤定位方法的特点,具体包括两种定位槽的加工特点、定位结构特点、精度比较、制作光纤阵列的可靠性特点分析等,提出了基于光纤阵列器件可靠性观点的认知。     

SIP协议介绍及应用前景分析

SIP是一种源于互联网的IP语音会话控制协议,具有灵活、易于实现、便于扩展等特点。文章介绍了SIP协议的发展历史、网络组成,通过与传统的电信网络协议对比分析了SIP协议的特点,结合SIP协议特点及现状对其应用前景进行了分析。     

ISO9000系列讲座(九) 质量体系审核总论

论述了质量体系审核的分类、目的、特点及步骤,简要介绍了内部质量体系审核的概念、目的、范围、特点及其与外部质量审核的区别。     

声学脉冲波识别触摸屏技术

分析了传统的电阻、电容、红外及声表方式触摸屏的特点和不足.介绍了声学脉冲波识别触摸屏结构、工作原理和特点.     

和谐之光--2006年中央电视台春节联欢晚会灯光设计方案

2006年中央电视台春节联欢晚会灯光设计的创作主题是“和谐之光”,结合该主题,本文介绍了春晚灯光设计思路、舞美设计特点与灯光效果的结合、节目设计特点与灯光效果之间的关系以及灯光设计特点,并对晚会灯光设计采用的新技术、新思路进行了分析.     

半水基清洗剂的性能与应用

文章阐述了半水基清洗剂的组成特点、类型、优缺点等基本概念,并对它的清洗工艺特点及应用情况做了介绍.     

MRO电子采购平台设计研究

文章通过分析了电子采购平台及MRO采购特点,分析了目前MRO具有的困难和特点。针对这些MRO采购特点,提出了MRO电子采购平台应具有的模块及各模块特点、功能。利用系统设计的思想对MR0电子采购平台进行了设计。为MRO电子采购平台的研究提供了一定的理论支持。     

The semiology of documents

The author describes: (1) how desktop publishing requires documents to be designed; (2) how elements in documents communicate identity, unity, sequence, hierarchy, similarities and differences, and conventional meaning through visual characteristics like surrounding white space, size of font or element, value, placement, and orientation; (3) how information processing, graphic characteristics, and reading styles interact during reading to produce a visual hierarchy of document elements, and (4) how to use this information with desktop publishing to design efficient documents     

New Design Technique for Stable Wide-Band Tunnel-Diode Amplifier (Correspondence)

It is verified experimentally and theoretically that highly reflective out-of-band characteristics are inherent in the usual stripline circulator, and follow a certain regularity. It is then described how a small-sized additional network to the circulator can improve its out-of-band characteristics. Using the improved circulator with this network, it is shown how to design a small-size wide-band TDA.     

电磁散射特征提取与成像识别算法综述

合成孔径雷达(SAR)图像的自动化解译是合成孔径雷达技术应用的重要发展方向之一。电磁散射特征与目标结构具有稳健的关联性,是SAR图像解译的关键支撑。近年来,如何准确地实现电磁特征提取以及利用电磁特征反演目标特性受到了广泛的重视。该文讨论了电磁特征提取和基于电磁散射特征识别方法的研究成果,总结归纳了其中的关键要素和主要思路,详述了电磁散射机理在成像和识别领域的扩展应用,展望了未来电磁散射特征提取与应用的研究发展趋势。      

Effects of carrier transport on the L-I characteristics of QWlasers in the presence of spatial hole burning

In this paper, we study the effects of carrier transport and carrier capture on the linearity of the light-current characteristics of a semiconductor laser using an analytically solvable model. We include various physical processes within the model and study how they affect laser linearity. The technique used shows how to integrate the photon and electron transport within a single model, and the conclusions reveal some interesting aspects of semiconductor laser characteristics     

服务器虚拟化技术及其校园应用探析

先阐述了服务器虚拟化技术的特点和优势,分析了华三的虚拟化产品特点,再论述了服务器虚拟化技术如何应用于校园数字化建设,以期达到降低运行成本、提升使用效率的目的。     

Parametric Characteristic Analysis for Generalized Frequency Response Functions of Nonlinear Systems

In order to explicitly reveal the relationship between system frequency response functions and model parameters which define system nonlinearities, and consequently unveil a direct connection from model parameters to system frequency response characteristics, a parametric characteristic analysis approach is proposed for Volterra systems described by a nonlinear differential equation (NDE). The parametric characteristics of the generalized frequency response functions (GFRFs) for the NDE model are established, and some important properties are discussed, which can explicitly reveal what model parameters contribute and how these parameters affect the GFRFs. Based on the parametric characteristic analysis, it is demonstrated how the system frequency domain characteristics are related to the system time domain model parameters and how the output frequency response function can now be determined explicitly with a detailed polynomial structure. These new results provide a significant and novel insight into the analysis and design of nonlinear systems in the frequency domain. Several examples are included to illustrate the results.     

New concept for determining the orders of SAC and PC

The autocorrelation of a Boolean function possesses the capability to reflect such characteristics as linear structure, Strict Avalanche Criterion(SAC) and Propagation Criterion(PC) of degree k. But it can do nothing in determining the order of SAC or PC. A calculating table for the autocorrelation is constructed in this paper so as to show what is beyond the autocorrelation and how the three cryptographic characteristics are exhibited. A deeper study on the calculating table in a similar way has helped us to develop a new concept, named as the general autocorrelation, to address efficiently the problem how to determine the orders of SAC and PC. The application on the Advanced Encryption Standard(AES) shows the SAC and PC characteristicsof Boolean functions of AES S-box.     

Floquet's theorem in three dimensions and its application to the dispersion characteristics of circular waveguides with screw periodicity for use with gyrotron backward-wave oscillators

Floquet's theorem for three dimensions is proved for each of the two mathematical conditions of periodicity: the differential equation and the boundary condition. The theorem applied to circular waveguides with screw periodicity provides the dispersion characteristics of the uncoupled modes. These characteristics are compared to those of a normal circular waveguide to show how screw periodic RF structures shift in phase the waveguide cutoff point and how such a shift is advantageous to gyrotron backward-wave oscillators.

     

A traffic measurement method and its application for cell lossprobability estimation in ATM networks

Focuses on how to determine a set of parameters describing cell arrival stream characteristics and how to evaluate the accuracy of these measurements. Since a cell arrival stream is both correlated and bursty, the autocorrelation characteristics between the number of arriving cells in two adjacent intervals are analyzed, and then the time interval is determined for which the autocorrelation may be neglected. It is also shown that this set of parameters can represent the first and approximately second moment statistics during any interval. A method of estimating cell loss probability through the use of a queuing model that has an input process is presented. The input process is determined from the set of parameters that describe the characteristics of the source. In order to verify the accuracy, a brief simulation study is carried out     

基于SINC函数靶标雷达电磁辐射特性的实现

介绍了靶标雷达如何模拟雷达工作,详细讨论了如何使用现场可编程门阵列(FPGA)查表方式实现SINC函数拟合雷达副瓣波形,叙述了通过配置参数实现不同型号雷达副瓣特性的模拟方法,并给出了计算公式和实现,最后,对量化误差进行了分析.通过误差分析可知,该方法可以逼真地模拟雷达天线副瓣电磁辐射特性,同时极大地降低了靶标雷达的研制、使用、维护成本,加快了研制周期.