基于GPRS的组合式车载导航终端硬件设计

针对目前自主式车载导航终端在地图数据动态更新和实时交通信息接收方面的不足,基于网络与自主式导航相结合的思想,该文采用基于GPRS的组合式车载导航服务终端的设计方案,阐述S3C44B0X模块、GPS模块、GPRS模块以及电源等主要模块的组成结构和工作原理。对终端进行调试,对接收的数据进行优化。该硬件设计方案结合软件设计将有利于实现地图与道路数据的动态更新和基于实时交通信息的动态导航。     

迈向新纪元的Cable Modem技术

Cable Modem技术能充分利用有线电视同轴电缆的带宽优势高速优势高速传送数据,因此业内人士普遍看好电缆接入在宽带应用领域的优势。与DSL和无线技术相比,Cable Modem具有标准完善、成本低廉、资源丰富、网络可靠、兼容性强等优点。美国ADC公司开发的Cudal2000来台是该领域最新的产品,极具发展潜质。     

QOS evaluation model for a campus-wide network: an alternative approach focussing on availability

This paper discusses a model for evaluating the quality of service (QOS) of a campus-wide network. The main goal is to achieve a mathematical model that can be applied to any network, providing its availability. The network where it will be tested has more than 5000 nodes with SNMP managed network devices.The model discards the classical approach to QOS that considers parameters such as delay or jitter. Instead, we evaluate quality as a function of the availability indexes for either the services or the network itself.Once the model is described, we will explain how it has been implemented at the Universitat Autònoma de Barcelona Campus network and the requirements––software and hardware––to install such a system in any network.     

基于Windows下Modem软件研究与设计

本文研究了Windows操作系统下I／O端口应用问题,用VC^ 6．0嵌入汇编语言技术,为“远传水表系统”项目开发了Modem通讯软件,并给出了部分实现函数。实践表明,软件运行良好。     

力争2号焦炉炉龄达40年的举措

分析了2号焦炉的生产现状,在总结基本操作经验的基础上,提出了将焦炉炉龄延长到40年的措施。     

高温高速行车试验中油品运动粘度与磷谱分析相关性的研究

通过高速行车试验中油品的40℃运动粘度和磷谱分析结果的讨论。发现两者具有很好的相关性。对油品中ZDDP的有效组分衰变分析,可以很好地预测油品的粘度增长趋势。P核磁共振仪是研究高温高速行车试验发动机油品质的一种很好的辅助工具。使用二类基础油及复合添加剂调制的油品,即使PS2O2含量已经接近0,油中PSO3含量下降仍然很慢,在使用二类基础油及复合添加剂调制的油品中,ZDDP的表面如此优良值得继续深入研究。     

Automated Assessment of Early Concept Designs

Building information modelling (BIM) is a powerful tool for clients and architects alike, particularly when clients have ongoing complex programmatic requirements. Chuck Eastman describes how with his team* at the AEC Integration Laboratory at the College of Architecture at the Georgia Institute of Technology he was commissioned by the US federal government's General Service Administration (GSA) to automate the design guidelines for all US courthouses in such a way that preliminary designs by architects could be assessed and checked against specific criteria. Copyright © 2009 John Wiley & Sons, Ltd.     

复垦后矿区生态系统服务功能研究进展

综述了国内外有关生态系统服务功能及其价值评估的研究进展,提出了复垦后矿区生态系统服务功能的概念、特性,归纳其类型为生产功能、生态功能和文化功能。同时简要分析了当前研究中存在的问题,如服务功能形成的微观机制及其参数研究欠缺、评价理论和方法有待完善、评价结果准确度低等,从而明确了今后的研究应着重于理论探索与方法完善,以复垦后矿区生态系统的微观形成机制为切入点,开展不同尺度和类型的服务功能价值评估,充分考虑影响其功能价值的因素,改进评估的手段、方法和技术,使评估结果更具可比性和实用性,为合理开发利用矿产资源,实现矿区生态的可持续发展提供理论依据和技术支持。     

现代有机分析在中药检测食物分析和手性识别的应用

简要介绍了有机分析化学的概念、应用与发展前景,重点综述了利用现代有机分析的新技术新方法测定中药材中药用成分研究;现代有机分析新方法新技术对食物中有关成分测定;现代有机分析在手性识别方面的应用.并对有机分析的发展进行了展望.     

Selecting the appropriate input data set when configuring a permanent workforce

This paper explores the issue of choosing the best data to use when running a scheduling model to select a permanent workforce for a service facility. Because demand is assumed to vary over the day and throughout the week, the choice of the input data is crucial. If a week of low volume is selected, the solution might call for an insufficient number of workers; if a week of high volume is chosen, excessive idle time might be the result. Staff scheduling at mail processing and distribution centers (P&DCs) in the United States provides the backdrop. In operating these facilities, a critical objective is to manage overtime, part-time workers, and temporaries so that when volumes are high, additional costs are kept to a minimum, and when volumes are low the permanent workforce is almost never idle. In quantitative terms, this means selecting the size and composition of the workforce so that over the year, no more than a total number of overtime hours, part-time hours and temporary worker hours are used when demand exceeds some baseline and absenteeism is taken into account. To solve the problem, an engineering approach is proposed in which estimates of productivity are made based on a single run of the optimization model and the final data set is chosen to satisfy a small error tolerance. The full methodology is illustrated with data provided by the Dallas P&DC.