基于DSTM的IPv6网络性能测试系统的研究

针对目前IPv6网络性能测试软件的缺乏,首先分析了IPv6网络性能测试的性能指标、测试方法及测试结构,然后在此基础上依据DSTM的主要原理机制,研究了在Windows平台下的一个IPv6网络性能测试系统Test6,该系统主要由往返时延测试器、丢包率测试器和吞吐量测试器构成,各个测试器均由其基本算法实现;通过该系统的使用,可以对测量结果的统计分析和数学建模,总结出各项性能参数和规律,为IPv6网络的端到端接入控制、镜像服务器选择、路由优化、拥塞控制、以及流媒体应用等提供客观、可靠的定量依据。     

IPv6协议一致性测试系统的研究与实现

通过分析IPv6协议测试需求,提出了一种适合IPv6的测试描述法,实现了测试数据描述、复杂计算、测试传输等方法,可以在一台物理测试器上支持多测试组件并发测试,采用静态描述和动态调整相结合的方式实现测试数据描述、测试描述法和测试系统互动的方式实现计算功能,网络接口和通信实体相结合的方式实现测试传输.并通过测试实践验证了这种测试框架的有效性.     

IPv6中Neighbor Discovery协议及其测试

IPv6协议是下一代互联网协议,NeighborDiscovery(邻居发现)协议是IPv6协议的一个重要组成部分,RFC2461是邻居发现协议的标准文本。为了检查各个生产厂家的实现是否与标准文本相一致,文章提出了一种协议一致性测试的方法,并开发了一个进行IPv6一致性测试的系统。该文提出了逻辑测试结构和虚拟测试器的概念,并在这个测试系统中应用了这两种测试结构和概念,还给出了一个邻居发现协议的测试实例。最后,给出了笔者对一种UNIX系统上实现的邻居发现协议进行一致性测试得到的结果,并对其与标准文本不一致的部分进行了分析说明。     

IPv6与IPv4间的SIP通信安全

SIP是一种在IP网络中建立、修改和终止多媒体会话的应用层控制协议,是下一代网络的一个重要信令协议。当前的因特网主要是基于IPv4的,IPv6被设计来代替IPv4,但是在相当长一段时间内,两者将共存。IPv4与IPv6终端间的互通显得尤为重要。本文介绍了IPv4与IPv6终端间的SIP会话,同时对其会话的安全性做了讨论,并针对其安全性提出了一种解决方案。     

IPv6协议一致性测试例的设计

文中给出了协议一致性测试的测试例的基本框架结构和测试例设计的一般步骤，针对IPv6协议的特点提出了IPv6协议一致性测试的测试例设计方案，应用这个方案设计了PMTU发现协议一致性测试的测试试例，对几种不同的IPv6协议实现进行了测试，并给出了测试结果。     

OSPFv3协议一致性测试集的设计和实现

设计改进了OSPFv3一致性测试例,使它能在IPv6上顺利运行,采用改进的穿越测试法,通过虚拟测试,利用测试序列包中的地址字段和其它特征字段,采用改进了的TSS语言,仅用一台测试器就搭建了一种逻辑测试结构,实现了多台虚拟测试器的测试拓扑。介绍了测试集的形式化,并对一基于Linux平台的OSPFv3实现的测试结果进行了分析。     

基于TTCN的IPv6协议测试

基于标准的协议测试描述语言TTCN，设计了一种针对于IPv6协议簇的软件接口，搭建了具体的网络测试环境，能够在谊测试环境中进行IPv6协议的一致性测试。最后，作为例子，对WIN2000的ICMPv6协议实现进行了测试。     

IPv6实验网的组建和测试分析

主要介绍设计、搭建IPv6实验网，并在此基础上捕获数据包，测试协议性能。通过分析数据包的结构，验证了IPv6网络的特点：地址匹配的方便性、数据报头的简洁性。通过设计和组建IPv6／IPv4双协议栈路由器，介绍了一种通过IPv4网络转发IPv6数据包的双协议栈隧道技术。     

IPv6过渡机制协议测试的方法与实现

IPv6协议是因特网的新一代通信协议，如何实现从IPv4到IPv6的过渡是IPv6发展急需解决的关键问题。IPv6过渡机制协议定义了一系列从IPv4到IPv6的过渡机制，为了保证各种IPv6过渡机制协议实现版本与IPv6过渡机制协议标准的一致性以及不同IPv6过渡机制协议实现之间的互操作性，以确保IPv4到IPv6的顺利过渡，需要对各IPv6过渡机制协议实现进行协议的一致性测试。本文给出了对IPv6过渡机制协议实现进行协议一致性测试的方法，用这种方法对现有的几种不同的IPv6过渡机制协议实现进行了测试并给出了测试结果。     

红沿河一期全范围模拟机的设计和开发

模拟机作为核电站操纵员进行培训的必备工具是电站生产准备期间的关键路径。红沿河核电站模拟机作为国内首个采用自主化DCS(数字控制系统)建设的设备,其设计有着自身的特点,其开发经验对于后续同类电站的模拟机建设有着一定的参考意义。就模拟机供货商的设计和开发流程进行了阐述,并就模拟机测试取得的经验进行了介绍。为从事模拟机制造、测试和管理工作的人员提供参考。     

Development of simulator for invoked reality environmental design

Invoked Reality (IR) research uses a variety of sensors and projection equipment for Natural User Interface (NUI) interaction. Such equipment requires an appropriate action region, which needs to be considered when implementing an IR environment. Accordingly, the implementation of an IR environment is problematic because of the arrangement of this equipment. The research presented in this paper overcomes this difficulty by proposing the “IR Simulator.” This simulator facilitates the design of and experimentation within the IR environment in a virtual environment. IR Simulator comprises an “experimental space editor” and “simulation manager.” IR Simulator enables design in diverse kinds of IR environments using its GUI-based experimental space editor. It also provides interaction with external IR libraries through the external IR library-interworking interface. Moreover, it enables simulation on the library connected on the basis of the virtual sensor data generated by the implementation of the proposed simulator. In accordance with experiments using the proposed simulator, a variety of IR environments could be generated and an arm motion recognition library could be simulated. Furthermore, the same environment generated by the simulator was easily implemented in the actual environment on the basis of the design results from the simulator. The experiment on the arm motion recognition library used in the simulator in the real environment was similar to the results obtained by the simulation.     

ARMv4指令集模拟器设计及优化技术

指令集模拟器是处理器、编译器以及嵌入式系统设计中的重要工具之一．首先讨论指令集模拟器的分类及特点，然后阐述作者采用解释技术开发的ARMv4指令集模拟器的实现方法，为了提高模拟效率，还讨论几种性能优化技术．     

多机仿真器SimDSM的设计及实现

仿真器是进行计算机体系结构研究的有力工具。本文以多机仿真器ＳｉｍＤＳＭ为实例,讨论了设计仿真器的一般原理和评价仿真器的标准,ＳｉｍＤＳＭ是为了分析研究分布式共享存储系统而设计的。它基于ＣＩＳＣ结构的Ｉｎｔｅｌ的体系结构,由于采用执行驱动和自定义的线程的实现方法,使得仿真可以高效准确进行。实验的结果表明,该仿真器具有较高的实用性和有效性。     

VLIW体系CPU仿真器MCS的设计与实现

仿真器是进行硬件设计评估,系统软件设计开发和计算机体系结构研究的有力工具。文章以一款VLIW(超长指令字)结构的CPU仿真器———MCS为实例,讨论了指令集仿真器设计的一般原理和关键技术。在对目标CPU进行仿真的基础上,通过模拟部分操作系统功能,MCS可以导入并且运行经过目标机编译器编译的目标可执行代码,进行可配置的数据收集和数据分析,从而达到评估CPU设计,分析指令效率,支持编译系统调试的目的。     

The design and testing of a force feedback dental simulator

The Iowa Dental Surgical Simulator is a haptic simulator to train dental students in the haptic skills of dentistry. The initial design emphasizes the detection of carious lesions. This work describes the software and implementation of the prototype system, the design tradeoffs' and the technical issues associated with haptic and graphics subsystems. The work also describes the current system performance, including a formal evaluation by practicing dentists and performance measures. A discussion of the limitations of the current system is followed by an analysis of opportunities to improve the quality of the simulator. The results should be of interest to designers of medical haptic simulation systems and other simulation designers.     

Robot simulator in TIPS/Geometric Simulator

With the growth of factory automation, the need for off-line robot programming is increasing rapidly. Off-line programming requires a robot simulator. This is the reason for the development of a TIPS/GS (Geometric Simulator), accompanied by a robot simulator. TIPS/GS has been developed as a project in the TIPS Research Association. The goal of this project is to extend the functions and applications of the solid modeler TIPS-1. Four simulators (i.e. the assembly simulator, engineering, NC simulator and robot simulator) have been developed for these extended applications.

The robot simulator described in this paper has the following special features:

• • When a robot motion is prescribed by the VAL-G language, the result can be seen on a CRT display in several patterns.

• • High-speed dynamic display which can almost keep up with real-time movements.

• • A shaded as well as wire-frame picture is used for the high-speed display entioned above.

• • Supported by the solid modeler, any robot and environment can be used with this system.

• • The preparation of a precise interference checker based on an analytical methods.

This paper is a report on the development of the robot simulator.     

小功率太阳能电池模拟装置的设计

阐述了一种小功率太阳能电池模拟装置。该模拟装置由AC-DC变换器与DC-DC变换器组成,AC-DC变换器将交流输入转换成直流电,DC-DC变换器将该直流电转换成具有太阳能电池输出特性的直流电。采用数字信号处理器MO-TOROLA56f801来控制.控制方法采用单极性SPWM法,模拟太阳能电池特性曲线采用三次样条插值算法。该控制方案已经在实验室得到验证,实际效果令人满意。     

Simulation and graphical animation of advanced manufacturing systems

Automated production systems, known as Flexible Manufacturing Systems (FMS), offer a promising solution for the low productivity of mid-volume, mid-variety batch production. These systems consist of integrated machine modules and material handling equipment under computer control.This paper describes a general purpose discrete-event Flexible Manufacturing Systems Simulator (FMSSIM). The package is programmed in FORTRAN and is capable of simulating different configurations, material handling systems, and topologies including bidirectional tracks. The simulator checks blockage of routes due to interference of carts and simulates random failures and repairs of the various components in the system. The simulator provides the user with a wide range of priority rules to select from, and enables the user to define his own rules if required. The simulator produces reports on various vital system performance statistics and also displays the movement of parts through the system on a refreshed CRT. This simulator is a modular, user-oriented package which allows the designer to evaluate a wide range of systems with varied design parameters and select an efficient flexible manufacturing system. Some general trends in the behaviour of the flexible manufacturing systems are identified and guidelines for their design and operation are suggested.     

GloMoSim中DSR协议实现分析

仿真是目前研究Ad hoc网协议和算法的廉价、有效手段。分析目前流行的网络仿真软件Glo-Mosim的控制流程,并且详细分析移动自组网路由协议DSR在GloMoSim中的设计与实现,重点分析DSR的路由请求处理、路由回复处理、路由错误处理、丢包处理、路由处理等必要操作。