基于高速外设模块的多核DSP与FPGA通信系统设计

详细介绍了TI公司TMS320C6678多核DSP高速外设模块EMIF16(外部存储器接口)的功能及特性,利用EMIF模块扩展存储空间大、通信速度快、硬件接口电路简单、性能稳定等特点,设计并实现了一种基于EMIF模块的DSP与FPGA异步通信接口,重点描述了接口通信系统架构设计和具体软件实现。测试验证表明基于该接口可进行DSP与FPGA之间多种格式数据传输,接口运行稳定可靠,扩展了TMS320C6678多核DSP处理芯片与外部器件通信系统接口的设计方式。     

软件无线电平台可重配置接口的实现

实现了一种用于上位机和FPGA处理板之间通信的可重配置接口,详细介绍了该接口的包格式设计和FPGA逻辑设计。仿真结果表明,该可重配置接口能根据信令,实现准实时在线参数配置,满足多种主流通信体制的不同速率要求。     

风力分级系统监控软件的设计与实现

文章以接口选择、软件结构和通信实现为出发点,介绍了煤炭风力分级系统中监控软件的设计与实现过程。变频器是该系统中的主要部件,可以利用VB本身的通信控件MSComm开发的通信软件建立变频器与计算机之间的串行通信,通过计算机的可视化监控软件调节变频器的相关参数,最终实现计算机对风力分级系统中风速的调控。该控制系统是一种简单、实用的监控系统。     

协同虚拟环境中分层智能化身控制模型的研究

为了增强协同虚拟环境中化身行为控制的智能性和模块独立性,基于VRML和智能代理技术设计和实现了一种分层智能化身控制模型.该模型中化身模拟智能实体的形体和简单行为,代理模拟智能实体的高级行为控制,化身代理和化身之间通过统一的调用接口进行控制和通信,使得模型各层之间有很好的模块独立性,并采用了基于规则的推理和分层有限自动机实现智能行为.最后的实例分析表明了该控制模型的可行性.     

计算机与CAN通信的一种方法

为了实现计算机与ＣＡＮ之间的通信,设计了一种具有ＲＳ－２３２和ＣＡＮ两种接口的通信模块,该模块应用单片机技术实现了两者之间的“透明”双向通信并可同时上不同的ＣＡＮ网络。文中详细阐述了模块的软硬件设计。     

基于XML的IP核通信接口建模技术

提出了一种通用的接口模型，在SoC设计的接口综合中对IP核的通信接口进行了建模。基于可扩展标记语言(XML)，提出了接口描述文件(IDF-XML)的概念，利用XML的优势对该模型进行描述，并提出了一种转换机制，将IDF-XML中的通信接口信息转换为接口综合中的对象模型。该文以一个简单数码相机的设计为实例，使用建模技术对其中的DCT模块进行接口建模。接口综合算法生成的接口电路将DCT模块与整个系统相连，实现了模块间的平滑通信。     

基于CPLD的两主机间的双向通信接口

本文提出了一种基于CPLD的双向并行通信接口，这种接口设计简单明了．可以解决两主机之间传输速率不一致问题．实现了可靠实时的数据传输。文中以实现MC51单片机与ISA总线接口的双向并行通信为例．具体阐述了这种双向通信接口的设计原理。     

VLIW多处理机接口部件的设计

URPR-1机器是一台采用多处理单元的VLIW体系结构单片机。它面向数字信号处理和图象处理,具有极高的运算速度和良好的性能价格比,接口部件位于主机和URPR-1机器之间。负责主机与URPR-1之间的通信,本文描述了接口部件的硬件组成,体系结构设计上的考虑和接口部件上软件的设计思想。     

多媒体数据会议底层通信机制的实现模型研究

参照ITU的T．120、T．123、T．122／T．125和T．124协议,设计了一个完全符合ITU系列协议标准的MRCS(Multi-point Real-time Conversation System)应用模型,并对该模型的各个层次之间的编程接口进行定义,初步实现多媒体数据会议的底层通信机制。     

嵌入式HFC透明网桥实现技术研究

在不同物理结构的网络之间互联，实现各种综合业务是网络和通信应用面对的重要课题，本文设计了一种可在HFC接入网的头端与用户端之间实现双向数字业务的嵌入式透明网桥，该桥基于DOCSIS协议的MAC层设计，有效实现通信的MAC地址动态获取、MAC帧过滤以及DOCSISMAC层数据与以太网MAC层数据的双向转发等功能．本设计已经成功用于自主开发的物理层和MAC层芯片组成的HDTV双向系统平台上，通过实际网络环境验证，本设计在HDTV双向点播、VOIP、Internet网通信等应用上表现出较高的网络适应性、稳定性和传输盾量．     

基于扩展接口语义的Web服务匹配模型研究

分析了Web服务组合的类型以及其中的接口匹配关系，通过对WSDL标准接口描述语言进行语义扩展，提出了一种轻量级的Web服务语义描述模型。该模型从服务接口的消息参数层、消息层和操作层分别扩展语义描述，将服务接口的描述从语法层提升到语义层，从而能够全方位地描述Web服务的功能、行为约束等属性。在此基础上，从这三个层次计算Web服务接口的语义匹配度，提出了多层次Web服务接口语义匹配模型。     

轻量级高性能网络通信组件的研究及应用

针对当前联网软件开发过程复杂、网络框架程序庞大、开发成本大等问题,在Windows 开发平台中Socket 通信 基础上,提出了一种轻量级的高性能网络通信组件Isocket。采用了IOCP 作为开发服务端,EventSelect 作为开发客户端,简化 了原有网络框架结构,设计了Agent 组件,提供了客户端与服务端的接口服务,并基于Eventselect 模型,设计API 接口,增加了 程序整合的适用性,实现了网络框架底层通信的完整封装,为增加软件开发通用性,减少开发人员学习成本与开发难度提供了 新的简化方法。     

E-Learning Courseware Usability: Building a Theoretical Model

Based on a stream of research, this study identified four components of the e-learning courseware usability: fundamental, appearance, information presentation, and communication. The communication component was considered an expanded component of the e-learning courseware usability. A theoretical model was built and three hypotheses were developed to examine whether the communication component as an expanded component of the e-learning courseware usability significantly and positively contributed to the three components of the e-learning courseware usability (fundamental, appearance, and information presentation). An instrument was developed and administered to subjects taking various e-learning courses. The collected data were analyzed using a variance-based Structural Equation Modeling (SEM) package that uses Partial Least Square (PLS). Analyses of the results indicated a strong validated model supporting all stated hypotheses.     

基于混合通信模式的消息中间件设计与实现

将发布／订阅和点对点两种消息通信模式相结合，提出并设计了一种基于混合通信模式的消息中间件系统，并针对系统实现中的关键问题提出了相应的解决策略。测试结果表明，该系统综合了两种通信模式的优点，在保证灵活性和可靠性的同时，消息传输效率也得到了有效提高。     

基于构件设计的正确性验证

本文研究基于构件设计的正确性问题,我们首先建立一个构件描述的模型：（１）接口：通过对ＣＯＲＢＡ的ＩＤＬ进行扩展,使其能够在构件的接口中同时描述构件的语法和语义信息,（２）实现,通过引入一个简单的程序模型,阐述如何利用子构造一个新的构件,然后我们考虑如何将构件的接口和实现联系起来,利用Ｈｏａｒｅ逻辑,验证一个构件的实现是否满足其接口中所给出的语义要求。     

A web-based distributed problem-solving environment for engineering applications

In this study, a prototype of web-based distributed problem-solving environment (W-DPSE) is presented to facilitate computer aided engineering (CAE) technologies. This system provides an effective approach to distributed modeling and simulation, and in addition, to support networked collaboration such that scientists around the world could interactively, visually and experimentally explore their daily design work through the proposed system. The W-DPSE system is constructed as a three-tiered architecture, consisting of three major layers: a web client presentation interface (WCPI), computing solver servers (CSS), and a system management server (SMS). All the components within this architecture are implemented with an object-oriented approach—Java while transparent communication across these three layers is attained through the remote method invocation (RMI) technology. To generalize the applicability of the system so as to accommodate interdisciplinary and diversified applications, a novel and efficient interface is developed for wrapping legacy computation codes, including C and FORTRAN etc., as a Java component. Note that in the interface, the communication mechanisms between Java objects and legacy codes are implemented by way of java native interface (JNI) and Unix inter-process communication (IPC) provided by OS. At last, the applicability of the W-DPSE system is extensively confirmed through the practices of two engineering applications: topology optimization of structures and pollutant transport simulations of coastal waters.     

硬件密码组件及其安全性研究

本文首先介绍了硬件密码组件的概念,简述了其与软件密码组件的区别然后提出了HCM的数学模型、系统结构和典型硬件组成,最后详细分析了HCM面临的安全威胁,设计了个相应的解决机制。     

一种基于Agent自适应RBAC包装器

基于角色的访问控制方法(Role-BasedAccessControl,简称RBAC)实现用户与访问权限的逻辑分离和构造角色之间的层次关系,从而方便了数据的安全管理。为实现RBAC在复杂环境中的应用,文章提出了一种基于Agent的自适应RBAC包装器。按照Agent设计方法研究了包装器的体系结构,设计了知识库、RBAC实现部件、底层通讯部件、顶层通讯部件和外部世界感知部件,构造了RBAC、R-D、R-M和R-X四种知识模型。     

COM-based software architecture for multisensor fusion system

In this paper a framework for constructing flexible, robust and efficient software applications for multisensor fusion system (MFS) is described. Three-tier architecture is exploited so that the whole software system can be divided into three parts: man/machine interface, logic part and database. Design of logic part according to requirements of MFS is emphasized in this paper by using component object model (COM). The result is a COM-based software architecture, which consists of four levels from bottom to top: sensor driver level (SDL), logical sensor level (LSL), fusion unit level (FUL) and task unit level (TUL). Each level is composed of some components with different functions. An intelligent robot system has been designed and developed in our lab based on the idea of the software frame presented above, and explicit advantages are shown extensively.     

CAD-integrated engineering-data-management system for spring design

In an iterative design process, a large amount of engineering data needs to be processed. Owing to the limitations of traditional software, the engineering data cannot be handled simultaneously and are usually divided into geometric and non-geometric data in order to be managed by separate systems. In the spring industry, which requires repeated definition of complicated shapes, design engineers need special interfaces for efficient product design and drafting. In this paper, the CAD-integrated engineering-data-management system is developed and implemented for spring design, in order to simplify the drafting and data-management processes. This research focuses on three main issues that can be also applied to other applications, particularly for component designs. These issues include: (1) product model definition, (2) CAD-database communication, and (3) human-machine interface development. With the definition of product model, the system identifies which data should be accessed from data files to generate the proper drawings, and which database structure should be constructed for the application domain. By the use of CAD-database communication, when engineers modify the geometric or non-geometric parameters of a product design, these parametric values can be simultaneously updated in the database. Furthermore, the support of human-machine interface enhances the efficiency in routine manipulation of support engineering data management and design/redesign processes.