用Socket编程实现TCP/IP网络接口

在描述TCP／IP协议的基础上．应用Socket编程的方法实现TCP／IP网络接口的数据通讯。     

An ecological approach to the on-line assessment of problem-solving paths: Principles and applications

In this paper, we propose a theoretical framework for designing on-line situated assessment tools for multimedia instructional systems. Based on an ecological psychology approach to situated learning, a graph theoretic methodology is applied to monitor students' performance (solution paths) throughout the learning activity. Deviation of the student's path from the target (expert) path generates indicators which can function as alerts to the student and to the instructor. The information collected in the dribble files and presented visually enables the instructor to identify problems quickly and intervene appropriately. The feasibility of the methodology is explored in case studies describing three instructional systems that teach (1) critical thinking and problem-solving skills, (2) principles of hemodynamic monitoring and treatment, and (3) orthodontic treatment, respectively.     

LINGO在求解供水系统优化运行模型中的应用

采用LINGO软件求解城市供水系统优化运行模型 .根据LINGO软件的语言规则和使用方法 ,将供水系统优化模型进行转化和求解 .基于此 ,将LINGO软件与常用的办公软件相互配合 ,开发出以LINGO为计算核心、Excel为操作界面的供水系统优化运行模型的求解软件 ,该软件具有性能稳定、操作方便等特点 ,有利于工程实际的应用 .     

一株以原油为碳源的Pseudomonas sp.菌化学趋向性研究

从某油田产出水中分离得到一株以原油为碳源的Pseudomonassp .菌 (假单孢菌 ) ,其化学趋向性运动能力中等 ,趋向性机理在本文中得以详细描述 .在可视化模型实验中可看到微生物向油水界面处的有序运动 ,而在有效的营养物浓度梯度范围内 ,化学趋向性运移速度与距油水界面的距离无关 ,受温度的影响很大 .并且在微观仿真模型实验中 ,可观察到细菌在孔隙壁和油、水三相交界处聚集 ,并讨论了该现象的形成原因及其对微生物采油的有利作用 .     

Effects of user experience on user resistance to change to the voice user interface of an in‑vehicle infotainment system: Implications for platform and standards competition

This study examines the effects of user experience on user resistance to change—particularly, on the relationship between user resistance to change and its antecedents (i.e. switching costs and perceived value) in the context of the voice user interface of an in-vehicle infotainment (IVI) system. This research offers several salient findings. First, it shows that user experience positively moderates the relationship between uncertainty costs (one type of switching cost) and user resistance. It also negatively moderates the association between perceived value and user resistance. Second, the research test results demonstrate that users with a high degree of prior experience with the voice user interface of other smart devices exhibit low user resistance to change to the voice user interface in an IVI system. Third, we show that three types of switching costs (transition costs, in particular) may directly influence users to resist a change to the voice user interface. Fourth, our test results empirically demonstrate that both switching costs and perceived value affect user resistance to change in the context of an IVI system, which differs from the traditional IS research setting (i.e. enterprise systems). These findings may guide not only platform leaders in designing user interfaces, user experiences, and marketing strategies, but also firms that want to defend themselves from platform envelopment while devising defensive strategies in platform and standards competition.     

关于"交互研究"的定量、定性分析——虚拟学习社区中交互结构研究的必然性论证

交互问题从来都是远程教育研究的核心问题,随着虚拟学习社区的悄然显现,这一问题变的更加突出。本文在对国内外交互研究现状的定量和定性分析的基础上,提出了目前有关交互问题研究中存在的问题。笔者认为,虚拟学习社区交互系统本质上是个人造信息控制系统,虚拟学习社区中交互结构研究应该进一步研究交互的突破口。     

Tribology Performance and Adhesive Strength Evaluation of TiAlSiN Coating

Scratch test and friction test were performed to evaluate the internal and external interface behaviors of TiAlSiN coating, respectively. The critical compressive and shearing stress of coating failure during scratch test were calculated and the values are 30.84 MPa and 4.98 MPa respectively. The average friction coefficients of TiAlSiN coating against 2Cr12Ni4Mo3VNbN steel are 0.70 (sliding speed 50 m/min), 0.63 (sliding speed 100 m/min), and 0.81 (sliding speed 150 m/min). The elements diffusion was analyzed by EDS. Al and Si element of coating material diffuse to the steel disc, except Ti element. The oxidation decreases with the increase of sliding speed, but the adhesion increases with the increase of sliding speed. More Al element diffuses to the steel disc at the high sliding speed, but the diffusion of Si element keeps almost constant at different sliding speeds.     

基于无线网络的计算机接口实验平台设计

计算机专业的学生在进行计算机接口实验时,需要选择一个合适的实验平台,而无线网络作为一种新型的通讯方式,得到愈来愈多的应用。在计算机接口实验中,应用无线网络技术,使得接口实验平台的应用更加广泛。     

LabVIEW在运动控制系统实验平台的应用和实现

运动控制系统实验平台即要求高速的信号处理能力,强大的组网能力,又要求有可视化的控制视图。为了将LabVIEW引入到现有运动控制实验教学中,改造的平台采用LabVIEW开发平台设计上位机的人机交互界面以取代传统实验平台的触控屏,下位机的通信程序以及工艺程序则通过Twidosoft编程软件实现。PC机与PLC的通信基于Modbus串行总线;PLC与伺服驱动器的通信基于CANopen总线,整个运动控制系统实验平台为"PC+PLC+伺服驱动器"的结构模式。LabVIEW在运动控制系统平台的引入,可以方便地实现数据采集和监视控制功能,直观且逼真地显示伺服电机的控制,较好地提高了原有实验平台的功能扩展性。     

微机原理与接口技术实验教学规划与实践

简要介绍微机原理与接口技术实验课程的规划和实施过程,从课堂教学整体到局部的理论教学方法、实验项目的规划和实验实施方法进行探索.结合典型实验案例,提出了微机原理与接口技术实验课程由局部到整体的模块化设计思想.将理论与实践、实验与创新有机地结合起来,使微机原理与接口技术课程促进学生实践与创新能力的培养.