纸箱打样机的嵌入式软件开发

以开发纸箱打样机四轴数控嵌入式软件为设计目标,在ARM主控板和DSP通用控制器双CPU模式的硬件结构上,搭建以μC/OS-II为操作系统的软件开发平台,并在此平台上设计纸箱打样机控制系统的启动代码以及串口驱动程序。纸箱打样机的文件系统、人机界面以及基于Modbus协议的串口通讯等应用程序设计是本文设计的重点,实现了对加工数据的文件管理。给纸箱打样机提供一个友好可定制的人机界面,缩短了开发周期,方便产品升级。     

Effective sampling strategy to detect food and feed contamination: Herbs and spices case

Sampling plans for food safety hazards are aimed to be used to determine whether a lot of food is contaminated (with microbiological or chemical hazards) or not. One of the components of sampling plans is the sampling strategy. The aim of this study was to compare the performance of three different sampling strategies, being simple random sampling (SRS), stratified random sampling (STRS), and systematic sampling (SS), with each other for their probability of detecting a heterogeneously distributed contamination in a lot of herbs or spices (i.e., a dry food product). To this end, a simulation model was developed, and applied to different scenarios for contamination level and numbers of samples collected. In addition, as a case study, the sampling plan of a company processing herbs and spices was evaluated using the simulation model. Results showed that the effectiveness of the sampling plan is influenced by the sampling strategy. With expected low contamination levels the SS strategy performs better than the two other strategies. At higher expected contaminated levels, the STRS strategy is preferred.     

CDMA20001x EVDO网络MM4+协议监测的实现

首先对CDMA2000 1x EVDO网络中的增值业务进行了介绍,然后针对增值业务中不同网络间的多媒体消息互通问题,对关键接口MM4接口中的MM4+协议进行了介绍与监测.最后,借助哈希索引算法提出了一种新的CDR存储方案,并通过现网数据测试,验证了相关方法的可行性.     

基于以太网的SERCOS-Ⅲ驱动程序的设计与实现

SERCOS-Ⅲ是实现数字伺服和传动系统的现场总线接口和数字交换的最新国际标准,其融合了以太网技术,是新一代开放式数控研究的新方向。基于通用通信控制器及标准以太网硬件上加载SERCOS-Ⅲ软件核心的模式开发了SER-COS-Ⅲ的物理层、数据链路层及应用层的驱动程序,采用IEEE1588作为该通信系统的同步方法,并在此基础上对IEEE1588的算法进行改进,实现了SERCOS-Ⅲ通信系统的主从站之间的高速同步通信。     

PC机与串行E~2PROM的通讯接口技术与实现

本文主要介绍ＰＣ机对串行Ｅ２ＰＲＯＭ进行读、写的专用接口设计技术，其中包括硬件结构设计和软件实现技术．这种专用接口具有硬件简单、软件灵活，使得ＰＣ机对串行Ｅ２ＰＲＯＭ的读、写方法准确而方便，具有良好的实用价值．     

分布式远动系统的结构与设计方法

本在论述了一般分布式数据处理系统的构成及其特点的基础上，讨论了分布式远动系统的结构，并提出了系统构成方法。结合作的工实践，对适用于分布式远动系统的监控局域网和通信规约进行了讨论。     

变电站微机监测系统实现CDT远动通信的方法

本文详细地论述了利用变电站微机监测系统实现ＣＤＴ规约远动转发的硬件和软件设计，它使监测系统兼具ＲＴＵ功能，成为一个实时可靠，性能价格比高的综合自动化系统。     

Individual differences during driver secondary task performance: verbal protocol and visual allocation findings

This paper reports a study in which visual allocation and verbal reports were recorded to determine individual differences in drivers conducting in-vehicle tasks. Participants drove a simulated route whilst conducting pre-defined tasks using the in-vehicle entertainment system. Tasks of varying complexity were presented to the participants. Licensed (experienced) drivers made significantly more verbal reports relating to road signs and markings, vehicles, scenery in general and vehicle operations; than did unlicensed (novices). No significant difference was found between expert and novice drivers when reporting in-car entertainment system related utterances. Surprising gender differences were also found. Males drove faster, with greater variance, and made more utterances in identified categories. Females were found to make significantly less verbal reports during secondary task performance. The difference in results obtained between expert and novices may imply that novices need to use their attention capacity to focus on the skill of driving, whereas experts through experience, have automated this skill and can use their attention capacity to more effectively during primary tasks. Results suggest that expert drivers are not necessarily experts at undertaking secondary tasks.     

An efficient solution for mitigating light-load penalty in EPONs

In this paper, an effective medium access control protocol is proposed for Ethernet passive optical networks. By combining the bandwidth guarantee polling (BGP) scheme with the strict priority queuing (SPQ) mechanism, the proposed solution can greatly mitigate the light-load penalty while supporting differentiated services. The performance of the proposed solution has been demonstrated by the simulation results.     

Research and Development of the Profibus-dp Card Based onWin CE.net

At present, the intelligent protocol chip - ASPC2 to set up the PROFIBUS- DP master station are so often used. In consideration of the price of the project and the advantage of the embedded system,we choose the PROFIBUS - DP protocol card, which is developed by ourselves.And we put it into the embedded system set by Win CE.net + ARM9.It is a totally new trial.Our embed- ded maser station is based on the Microsoft Windows CE. net operating system (OS) and the SAMSUNG SMDK2410…