Experion PKS与RTU、ESD通讯的实现

以塔里木油田迪那2气田为例,从Experion PKS与RTU、ESD的系统结构、硬件及软件组成情况入手,重点介绍了基于Modbus协议Experion PKS与RTU、ESD之间通讯的实现过程。     

企业VOIP数据安全解决途径的探讨与实践

多媒体应用与企业传统网络结合使得VOIP技术迅猛发展,VOIP成为现在以及未来会成为话音的主流技术。针对企业VOIP应用的攻击日渐繁多。顾名思义,VOIP与运行在IP网络上的其他基于IP的应用,如网页浏览(web)和电子邮件(email)一样有着共同的安全威胁和弱点,包括所有的来自IP网络层的威胁。网管人员和邮件系统管理员迫切需要解决这些威胁还包括标准网络安全技术和优秀的网络设计试图解决的问题。本文主要就如何通过采取一个仔细规划的、多层次的VoIP网络防护措施让VOIP数据高枕无忧以及除了这些网络层的若干威胁外,VOIP应用还需要面对一系列的协议和应用特有的威胁和一系列内容相关的威胁做一些讨论。     

浅议网站的安全及应对策略

网站发展的迅猛,虽然方便了很多行业,但同时安全隐患也随之而生。病毒、黑客程序、邮件炸弹、远程侦听等日益猖獗,由此引起网站安全问题日益严重。如何保护计算机信息安全,也即信息内容的保密问题显得越来越重要。本文介绍了目前网站中主要存在的不安全因素,并在提出了相应有利于保护网站的安全应对策略。     

电子商务安全管理体系的构建

为了提供一个安全可靠的电子商务应用环境,在分析电子商务安全的基本要素后,提出安全的电子商务环境应包括精心规划的管理体系,严密的技术措施和完善的法律体系。所以,电子商务的安全管理应该从技术、管理、法律等方面综合考虑,才能构建一个完整的电子商务安全管理体系。     

CPU卡流量计功能要求及实现

随着城市燃气用户的快速发展及应用,CPU卡流量计因功能强大、安全性能强的优点在城市燃气应用中越来越广泛,它取代了传统的上门抄表工作,为燃气公司节省了大量的人力、物力。根据CPU卡以及城市燃气的特点,设计了用于城市燃气的CPU卡文件结构以及密钥管理体系,实现了CPU卡流量计的计量及预付费功能。     

便携式安全阀在线校验仪的研制

目前,安全阀在线校验系统普遍存在精度低、安全性和便携性差等缺点.提出了以STC12C5A单片机为核心,基于阀瓣微动技术的便携式安全阀自动校验仪的设计方案,并完成了对该压力校准系统的研制.工程应用表明,该仪器具有精度高、功耗低等特点,能实现数据共享,操作灵活,易于携带,在行业中具有很高的推广价值.     

Direction coding using a tactile chair

This laboratory study examined the possibility of using a car seat instrumented with a tactile display to communicate directional information to a driver. A car seat fitted with an 8 × 8 matrix of vibrators embedded in the seat pan was used to code eight different directions. Localization response time and angular accuracy were examined as a function of stimulus direction, presence of a tactile attention cue, temporal pattern, stimulus layout, age, and gender. The mean absolute angular error was 23°, and both localization accuracy and response times were superior for the back left, backward, and back right directions. Of the various temporal pattern/attention cue combinations examined, results favored the relatively fast patterns consisting of vibration bursts of 125 or 250 ms without a centrally located attention cue over 500 ms bursts that were preceded by an attention cue. Observed age and gender effects were relatively modest, suggesting that using tactile cueing to communicate direction is effective across a wide range of users. In addition, the tactile stimulus was detected by more than 90% of the participants under surprise trial conditions. Overall, these results indicate that the tactile chair provides a promising and robust method of providing directional information.     

一种强安全约束机制下的云计算任务调度方案

针对云计算技术中的资源调度时间长、开销大、不考虑调度安全的问题,本文在对常见的云环境下工作流任务的资源调度问题进行建模的基础上,提出了一种强安全约束机制下的云计算任务调度方案。该方案按照所用方法的安全强度,再加上相关软件的安全程度,赋予虚拟机不同的安全等级;另一方面,其按照用户的需求等诸多方面,能够赋予操作不同的安全需求等级;最后使用变近邻粒子群算法对该问题进行了求解。在CloudSim仿真平台上的实验结果证明,本文提出的算法与用最大－最小蚁群算法、遗传算法与该算法相比,该算法具有很好的可用性和寻优能力。     

云化SFT下的径集域与割集域的重构与研究

为了克服原有SFT体系中径集域和割集域处理具有模糊性、随机性和离散性故障数据能力不足的问题,使用云模型和SFT相结合的方法来解决该问题。首先使用云模型云化SFT特征函数,得到云化特征函数,进而云化径集域和割集域,最终得到云化径集域和云化割集域。云化径集域和云化割集域没有严格的分界线,分布区域是通过云滴表示的。若云滴表示的元件/系统故障概率小于P_b,这些云滴存在的区域即为云化径集域;反之大于P_b的云滴存在的区域为云化割集域。通过实例分析了元件X₁和系统的云化径集域和云化割集域,得到了他们适合工作的环境因素变化范围组合。分析过程和结果表明云化径集域和云化割集域能克服原始故障数据的不确定性。     

Safe driving in a green world: A review of driver performance benchmarks and technologies to support ‘smart’ driving

Road transport is a significant source of both safety and environmental concerns. With climate change and fuel prices increasingly prominent on social and political agendas, many drivers are turning their thoughts to fuel efficient or ‘green’ (i.e., environmentally friendly) driving practices. Many vehicle manufacturers are satisfying this demand by offering green driving feedback or advice tools. However, there is a legitimate concern regarding the effects of such devices on road safety – both from the point of view of change in driving styles, as well as potential distraction caused by the in-vehicle feedback. In this paper, we appraise the benchmarks for safe and green driving, concluding that whilst they largely overlap, there are some specific circumstances in which the goals are in conflict. We go on to review current and emerging in-vehicle information systems which purport to affect safe and/or green driving, and discuss some fundamental ergonomics principles for the design of such devices. The results of the review are being used in the Foot-LITE project, aimed at developing a system to encourage ‘smart’ – that is safe and green – driving.