动态连接技术应用于传输设备软件升级的改进

VXWORKS的动态加载器实质运用了动态连接技木,本文针对动态连接技术在传输设备软件升级应用中的不足, 提出了改进方法OURTA。该方法通过一定的简化,有效地解决了在线升级的代码添加、状态处理、时间性能问题。     

IDSSRJ的多库动态交互集成模型

多库集成技术是当前开发智能决策支持系(IDSS)的关键技术之一。在智能雷达干扰决策支持系统(IDSSRJ)中,提出了一种应用动态数据交换(DDE)和动态连接库(DLL)技术来构建动态数据通讯通道,建立多库动态交互集成模型的方法,并详细介绍了这种多库动态交互集成技术。     

工作流模型动态修改的研究与实现

本文分析了现有工作流技术的优缺点,并介绍了工作流、工作流参考模型和工作流模型建模方式等相关知识。通过目前工作流模型的局限性,得出动态修改的需求,对动态修改技术,结合办公自动化实例,对流程进行动态修改,包括增加活动、删除活动和调整活动间的连接。     

音频局域网的动态连接

建立在电话网上的基于音频的局域网，可减少投资，便于与其他网络连接，用阻塞性交换机建立的局域网的连接阻塞问题一直是局域网的重要课题之一，本文给出一种新方法－动态连接法－解决该问题。文中讨论了动态连接法的原理，状态转换图及结构下的原理。     

间断连接无线互联网络中路由问题的动态规划方法

在间断连接无线互联网络中，由于自然干扰或人为因素影响，节点之间无线链路通常在时间上具有间断特性，这就为间断连接无线互联网络的选路问题提出了新的挑战。丈章在链路统计特性的基础上，重点分析了运用动态规划方法求解该问题的基本思路。并且给出了该方法的基本方程，从理论上分析了该方法的正确性和有效性。     

动态对称密钥加密算法下终端升级文件安全传输

为了提高终端升级文件的安全传输能力,需要进行文件加密设计,提出基于动态对称密钥设计的终端升级文件加密安全传输方法。采用无代理密钥发布协议进行终端升级文件的访问控制,构建终端升级文件的动态对称密钥;结合双线性映射方法进行终端升级文件安全加密过程中的密钥构造和算术编码设计;根据明文攻击的强度对终端升级文件进行置乱度重排,采用随机线性编码方法完成终端升级文件的动态对称密钥加密,实现文件的安全传输。仿真测试结果表明,采用该方法进行终端升级文件加密和传输的安全性较好,抗攻击能力较强,提高了文件的安全传输性能。     

在Lab VIEW中调用动态连接库实现与数据采集卡的数据交换

文章介绍了虚拟仪器的体系结构及其开发工具LabVIEW的特点 ,阐述了用VC ++编制Windows 32动态连接库实现驱动自制数据采集卡 ,并在LabVIEW中调用动态连接库实现Lab VIEW与数据采集卡间的实时数据交换的方法、步骤及需要注意的几个问题。     

ATM网络VP带宽动态管理策略的研究

文章介绍了一种适合于混合业务类型、非均匀业务流两步长VP动态带宽管理策略，分析了带宽管理策略的带宽利用率、连接阻塞概率和带宽分配处理负载，对其进行了计算机模拟仿真，并与固定步长动态带宽管理策略进行了分析比较。     

基于Web环境下的动态网页与数据库连接的有效途径

文章介绍了几种动态网页与数据库连接技术,重点介绍ＡＳＰ中比ＣＧＩ更快捷简便拓种数据库访问技术,并对在Ｗｅｂ页中调用数据库图象作了介绍。     

GPIB接口板AX5488在Labview中的应用

介绍了GPIB接口板AX5488在Labview编程环境中，调用其动态连接库实现对带有GPIB接口的智能仪器进行程序控制的方法。该方法在研制的R-T曲线虚拟仪器测试系统得到了很好的应用。使用该方法还可以使类似的硬件设备在Labview中都得到应用。     

"电力电子技术"实验软件的开发

介绍了使用C^ Builder 6．0对“电力电子技术”实验软件的开发。根据实验内容进行了软件结构和功能的设计,说明了使用鼠标进行连线、连线不闪屏、动态显示波形和保存波形等关键技术的实现方法。该实验软件全方位地模拟了真实的实验台,界面友好、互动性强,帮助学生在软件环境下完成实验过程：按步骤正确连接实验线路、观测波形、观察参数变化对电路波形图的影响以及数值计算结果的不同。该实验软件对于“电力电子技术”课程的教学起到了较好的辅助作用。     

用微变等效法分析差动放大电路

传统对差动放大电路的动态分析,均多是根据输入、输出信号的特点,利用特定条件下的微变等效分析,这种方法易于得出结论,但不容易理解其物理含义,这是认识和理解差动放大电路的难点之一。文中从典型的电路出发,根据连接方式的不同,得出相应的指标,从而解决了这个难题。     

Small-signal characterization of microwave and millimeter-waveHEMT's based on a physical model

A highly efficient generalized physics-based approach for small-signal characterization of FET devices is presented. A novel method is developed for extracting the frequency dependent two-port parameters from a single time-domain physical simulation based on a multi-signal excitation scheme. The technique is applied to simulating the frequency- and bias-dependent scattering parameters of HEMT's using a quasi-two-dimensional physical model that incorporates the main physical phenomena which govern the device behavior. A new carrier energy distribution model is presented which improves the accuracy of the physical model. An equivalent circuit is also generated from the physical dynamic simulation which can be used for predicting S-parameters and for indirect linking of the physical model to existing CAD tools. The unique formulation and efficiency of the present technique make it suitable for computer aided design of FET subsystems. The accuracy and flexibility of this approach is demonstrated by comparison of simulated results with measured data for a pulse doped pHEMT and uniformly doped GaAs channel HEMT     

Softwareanbindung von Feldbussen unter MS-Windows

This paper at first deals with the elementary conditions given by the typically service oriented structure of fieldbus application layers. The main part deals with four basic software methods: program implicit method, calling a DLL (dynamic link library), communication via DDE (dynamic data exchange) and communication via OLE (object linking and embedding). Finally examples are given using program structures written with a graphical programming system.     

Electrostatically Directed Self‐Assembly of Ultrathin Supramolecular Polymer Microcapsules

Supramolecular self‐assembly offers routes to challenging architectures on the molecular and macroscopic scale. Coupled with microfluidics it has been used to make microcapsules—where a 2D sheet is shaped in 3D, encapsulating the volume within. In this paper, a versatile methodology to direct the accumulation of capsule‐forming components to the droplet interface using electrostatic interactions is described. In this approach, charged copolymers are selectively partitioned to the microdroplet interface by a complementary charged surfactant for subsequent supramolecular cross‐linking via cucurbit[8]uril. This dynamic assembly process is employed to selectively form both hollow, ultrathin microcapsules and solid microparticles from a single solution. The ability to dictate the distribution of a mixture of charged copolymers within the microdroplet, as demonstrated by the single‐step fabrication of distinct core–shell microcapsules, gives access to a new generation of innovative self‐assembled constructs.     

Track association for over-the-horizon radar with a statistical ionospheric model

Over-the-horizon (OTH) radar exploits the refractive nature of high-frequency radio-wave propagation through the ionosphere for the purpose of wide-area surveillance. In order to localize targets, however, multipath slant tracks from different ionospheric layers, but the same target must be combined. The process of track association is complicated both by uncertainty in downrange ionospheric conditions and by the fact that in multiple target cases, the associations of slant tracks to targets are unknown. This paper proposes a method for joint multiple target ground track estimation and slant track association, or mode linking, with uncertain ionospheric conditions where the slant-track-to-target assignments and slant tracks' ray mode paths are unknown. Maximum a posteriori (MAP) mode linking exploits the statistical dependence between slant tracks on different ray mode paths to provide accurate mode linking decisions and ray path assignments and, thus, accurate ground track estimates. The approach uses Markov modeling for the dependence between different ray path types as well as for the temporal correlation between mode linking hypotheses at different revisits to obtain consistent mode linking decisions. Monte Carlo simulation results suggest that MAP mode linking can potentially provide a significant improvement in ground track accuracy over conventional mode linking with higher probabilities of correct track associations and ray mode assignments. Results with real OTH radar slant track data of multiple slant tracks from multiple targets and validated against ground truth that support the simulation study are presented.     

基于单片机USB接口的PC主机驱动程序和应用程序设计

介绍了与51单片机USB接口的PC主机在Windows环境下软件设计过程。驱动程序由DriverStudio生成,动态链接库和应用程序分别采用Visual C＋＋和Visual Basic编写。实现了PC机与单片机之间通过PDIUSBD12芯片进行数据通讯的功能。     

Evaluating the Productive Efficiency of Dynamical Systems

Engineering managers are typically concerned with the assessment and improvement of system performance. In the literature, analytical approaches have been proposed not only for the purpose of computing and estimating performance measures, but also for linking these performance measures to performance improvement strategies. In reality, organizational and/or system efficiency performance is dynamic, nonlinear in its relationship to key production drivers, and a function of multiple/complex interactions and feedback mechanisms. This paper introduces a methodological approach that combines the system dynamics (SDs) modeling paradigm with the concepts taken from the measurement of productive efficiency so as to evaluate dynamical systems. In this research, the SD paradigm is coupled with the fundamental assumptions of production theory in order to evaluate productive efficiency performance. As a result, a structure within the SD model is introduced that computes efficiency performance scores based on a hill-climbing optimization procedure. The structure is illustrated using an electric utility example described by Kopp, 1981, where constrained optimization results are not only replicated but also the path to achieve optimal dynamic system performance is found. An example is provided as to how this structure can be used to facilitate policy decisions within a technology management environment where investments are made in new technologies.