数字电视的条件接收系统

数字电视的兴起使人们能够欣赏到高质量的电视节目,伴随数字电视的成熟,条件接收系统(CAS)得到很好的发展。主要介绍数字电视条件接收系统相关技术的发展、基本功能、安全机制、工作原理及其安全性要求。     

基于ARM微处理器的故障记录系统

给出了在普通数据采集基础上的故障记录系统的设计方案,利用ARM微处理器实现了模拟信号较完整的故障波形记录和开关信号的事件顺序记录(SOE)。对LPC2106ARM系列处理器、ADS7871模/数转换器以及数据通信接口等内容进行了讨论,阐述了系统的工作原理、软件处理方式、系统通信。该设计方案电路简单,特别适用于电力系统。     

基于Linux的以太网数据包捕获方法

网络数据的捕获是入侵检测系统的基础,本文在分析了以太网工作模式的基础上,实现了基于Linux操作系统上的以太网数据包捕获,与传统的套接字方法进行比较,说明该方法具有高效率和良好的兼容性。     

适用于网页服务器的应用型入侵检测系统

网页服务器用来传递或处理各种信息,网络攻击手法日新月异,造成诸多攻击手法可以很容易地被实现,多数的入侵检测系统以入侵特征规则作为检测基础,仅能对已知的弱点做有效的检测;提出一个适用于网页服务器的应用型入侵检测模块,将检测模块直接嵌入于网页服务器中,以“异常行为检测”和“错误行为检测”的办法,确认攻击类型,有效地预防新型攻击行为与检测已知攻击事件,对提高系统的安全性有重要作用。     

TCP Performance in Optical Packet-switched Networks

Optical packet assembly is a key function to support inter-working between TCP/IP networks and optical packet-switched networks. It is characterized by the assembly delay and by the segment aggregation needed to form an optical packet. These counter-balancing aspects depend on several environment variables, such as the TCP parameters, the access link speed, the optical packet size whose effects are studied in this paper. Performance evaluations are obtained by extensive simulations in terms of send rate of TCP flows, fairness, efficiency, and assembly delay. Some guidelines in the design of optical packets that take into account the results presented are given.     

基于公用无线网的短信息分发系统设计与实现

介绍了以GSM系统为平台的数据信息分发系统的设计与实现,并基于TC35模块,完成了计算机管理系统与GSM网络的互连,实现了对信息的分发、确认功能。     

The Role of Test Protocols in Automated Test Generation for Embedded-Core-Based System ICs

Modular testing is an attractive approach to testing large system ICs, especially if they are built from pre-designed reusable embedded cores. This paper describes an automated modular test development approach. The basis of this approach is that a core or module test is dissected into a test protocol and a test pattern list. A test protocol describes in detail how to apply one test pattern to the core, while abstracting from the specific test pattern stimulus and response values. Subsequent automation tasks, such as the expansion from core-level tests to system-chip-level tests and test scheduling, all work on test protocols, thereby greatly reducing the amount of compute time and data involved. Finally, an SOC-level test is assembled from the expanded and scheduled test protocols and the (so far untouched) test patterns. This paper describes and formalizes the notion of test protocols and the algorithms for test protocol expansion and scheduling. A running example is featured throughout the paper. We also elaborate on the industrial usage of the concepts described.     

一种新颖的表面等离子谐振效应光波导水质传感技术

光学表面等离子谐振（ＳＰＲ）效应是一种很有效的水质检测技术，经过详细的理论推导，同了ＳＰＲ反射光强的普遍适用公式。在纯水与受污染水两种情况下，根据一些已知参数计算出结果。由计算结果数据一出的曲线比较表明，ＳＰＲ效应在两种情况下有明显差别，这也正是ＳＰＲ效应用于水质检测的理论根据。     

微米／纳米技术及其应用

介绍了当前国际上关于微米、纳米技术及其在微型机械、微型机械电子系统以及在专用集成型仪器等方面的应用。     

An M/G/1 Retrial Queueing System with Two-Phase Service and Preemptive Resume

An M/G/1 retrial queueing system with additional phase of service and possible preemptive resume service discipline is considered. For an arbitrarily distributed retrial time distribution, the necessary and sufficient condition for the system stability is obtained, assuming that only the customer at the head of the orbit has priority access to the server. The steady-state distributions of the server state and the number of customers in the orbit are obtained along with other performance measures. The effects of various parameters on the system performance are analysed numerically. A general decomposition law for this retrial queueing system is established.