基于FPGA的多路光电编码器数据采集系统

介绍了一种基于现场可编程门阵列(FPGA)的多路光电编码器数据采集系统,包括其功能、原理、软件编程和硬件实现电路。描述了该电路的4个主要功能:四倍频细分、辨向、计数及串行通讯。根据波形的跳沿实现四倍频细分;通过对波形相位的分析,采用基于相位变化的设计原理实现辨向。整个系统在QuartusⅡ软件环境下实现编程,应用A ltera公司的EPF10K20TC144-3型芯片作为硬件载体,角度分辨力可达1″。最后,给出了详细的编程和仿真波形。     

An identity authentication scheme based on cloud computing environment

In order to solve the shortcomings of traditional identity authentication technology, such as low security, low efficiency, a mobile terminal identity authentication scheme based on cloud computing environment is proposed in this paper. In addition, the two-dimensional code technology is used for identity authentication in the cloud computing environment, and the QR coding technology is also used. The dynamic authentication of the mobile terminal is realized by using the two-dimensional code as the information transmission carrier. According to the security analysis, the scheme has simple structure and no need to use the third party equipment, which has high security and adaptability. Finally, the two fusion of two-dimensional code proposed in this paper provides a new way of thinking for the identity authentication based on the cloud environment, and also promotes the development of the Internet of things.     

利用网络提高C语言实验教学质量

传统的一问一答实验教学模式不能适应现代高等教育的需要。文中介绍了充分利用网络和相关软件。以互动方式向学生传授科学的调试程序方法，以实验报告电子文档的规范化及资源共享，实现了教学相长。实践证明取得了良好的教学效果。     

利用网络提高C语言实验教学质量

传统的一问一答实验教学模式不能适应现代高等教育的需要。文中介绍了充分利用网络和相关软件,以互动方式向学生传授科学的调试程序方法,以实验报告电子文档的规范化及资源共享,实现了教学相长。实践证明取得了良好的教学效果。     

故障诊断系统中深浅知识集成表示方法的研究

传统的故障智能诊断系统大都只是基于专家经验,但是,由于现代设备的复杂性,使其往得不到准确的结果,这时必须借助于与诊断对象有关的原理性知识,本文基于设备的层次性理论,提出了一种深浅知识集成表示模型,并采用面向对象表示和产生式规则相结合的方法予以实现,深浅知识的有效结合,不仅可以提高故障诊断的准确性,而且诊断推理的效率也得以提高。     

ZigBee无线传感器网络的有线通信与管理

针对无线传感器网络信息的有效管理,本文结合ZigBee技术及可视化程序设计语言Visual Basic 6.0,实现了无线传感器网络信息的有线传输及有效管理,并将其应用在电力设备测温中。文中详细阐述了传感器节点的硬件设计、软件设计及上位机(PC)监控界面的设计,并给出了与通信相关的源程序。     

藏族基础教育远程教学资源开发框架设计

现代信息技术的快速发展,不断推动教育技术和教育方式的革新,国家及地方积极进行教育教学资源的建设,以促进教育发展新形势的需要。我国广大藏区教育基础设施相对落后、教学资源严重匮乏,教育发展明显滞后,通过藏族远程教学资源建设,使广大藏区师生通过Internet技术获得优质的教学资源,充分利用现有的硬件设备,提高教学质量,引领课堂教学质量的提升。     

电能质量监测系统的兼容性研究

提出采用驱动程序方式和后台接口方式实现数据,由系统建设方来制定接口,能极大地提高系统的可扩展性。系统建设完毕后,要在系统中接入新的监测终端,只需新设备厂商实现驱动程序或后台接口,就可顺利地达到目的。     

Assessing the Impact of Security Education Initiatives on Critical Infrastructure Protection

The need to protect US critical infrastructures has been the primary motivation behind two of the US Federal Government’s security education initiatives: the National Security Agency’s Centers of Academic Excellence in Information Assurance Education (CAE/IAE) programme, and the National Science Foundation’s Federal Cyber Service: Scholarship for Service (SFS) programme. This article assesses the strength of these education programmes with respect to improving the level of critical infrastructure security.     

一种新的无参数支持向量机分类器

提出了一种新的基于二次规划的无参数支持向量机分类模型，克服了标准支持向量机需要选择正则化参数的缺点，而且该模型简单，易于实现。数值实验表明了该模型的可行性和有效性。     

一种基于BiLSTM-CRF的命名实体识别方法研究

针对目前从开源数据中挖掘结构化数据存在的数据繁复,新词多等问题,提出了一种命名实体识别的方法。该方法将文本进行实体规范、去停用词和加入词典特征等数据预处理后形成的信息作为输入,通过BiLSTM-CRF算法实现命名实体的识别。最后通过三种不同的语料对该方法进行了验证,实验结果表明了融合领域特征的命名实体识别达到了91.63%。     

Distributed computing: Considerations for its use within educational environments

Much has been written on the desirable aspects of distributed computing, with material too often describing exotic equipment and protocols that are offered. The intention of this paper is to highlight the design considerations applicable to an educational environment. The approach is more pragmatic than conceptual, with particular examples given of the use of distributed computing in sharing limited resources in an environment where adequate computing equipment is often a luxury. It is worth noting that institutions with little research funding have very limited resources, despite the recognised need for computing in education. It is hoped that the reader will get some understanding of the intricate and complex world of distributed computing design, whilst appreciating the advantages of such techniques in supporting fundamental teaching requirements.     

Land cover and global productivity: A measurement strategy for the NASA programme

NASA's Earth science programme is developing an improved understanding of terrestrial productivity and its relationship to global environmental change. Environmental change includes changes that are anthropogenic, caused for example by increasing population and resource use, as well as those that are natural, caused by interannual or decadal variability in climate and intrinsic vegetation dynamics. In response to current science and policy concerns, the Earth science programme has carbon and the major biogeochemical cycles as a primary focus but is broad enough to include related topics such as land-atmosphere interactions associated with the hydrological cycle and the chemical composition of the atmosphere. The research programme includes the study of ecosystems both as respondents to change and as mediators of feedback to the atmosphere. Underlying all the research elements are important questions of natural resources and sustainable land management. The land cover and land use change element of the programme is aimed specifically at studying the causes and effects of land transformation and changes in land use practices. The NASA Earth science programme has a primary focus on using satellite remote sensing systems but also recognizes the need for an integrated approach to achieving its science goals by combining satellite and in situ process measurements and numerical modelling. This paper outlines the programme strategy for addressing its major focus. The approach adopted provides a balance between long-term satellite measurements of the Earth's surface at moderate and high spatial resolutions that are needed to quantify change, and the new experimental satellite missions that are aimed at addressing specific process research questions and testing new sensing technology. In addition to satellite measurements, ground-based in situ measurements are needed to validate the satellite data products, to describe and quantify processes, and to parameterize and validate process models. Numerical models need to be enhanced to provide both the study of processes and a predictive capability for the study of global change.     

基于IP核的智能CAN设备设计与实现

针对目前基于Asic处理器智能设备存在的不足.开发出一种基于IP核的智能CAN设备;主要利用NIOSII固核处理器IP核、CAN总线IP核、PCI总线IP核,在SOPC集成环境及其它IDE环境中实现系统集成和定制,完成了NiosII处理器系统集成如主处理器、Cache、片内ROM/RAM、片外SRAM和FLASH资源等;Wishbone总线到Avalon总线的桥接;基于DPRAM的智能接几数据交换单元等,并完成设备的驱动及应用软件开发;在500kbps波特率和8字节数据位条件下,对该设备的CAN总线性能进行了实测,结果表明其性能高且灵活可靠.     

浅析高校计算机机房管理

最近几十年里,教育信息化建设快速发展,信息化的环境建设、资源建设、组织建设等,是一个复杂的综合工程。要实现真正意义的数字化、信息化教学,需要从观念、思想、设施、设备、知识和技能等各个方面来影响教育的过程和结果。对传统的机房系统维护手段的缺点做了阐述,并针对现阶段如何实现高校机房精确管理的问题,提出了一种全新的基于VOI虚拟桌面化的系统方案,对VOI提出了实施方案并通过实验验证相关内容。     

基于Agent的网络设备监控管理系统的设计与实现

对目前已有的网络设备管理系统进行了研究和比较,针对存在的不足点设计并实现了一个基于Agent的客户/服务结构的自动化网络设备管理和监控系统.设计该系统的主要目的是为提高局域网内的设备自动管理提供一个有效的解决方案.该系统的设备信息采集部分主要是利用WMI(Windows Management Instrumentation)的DCOM接口技术来实现的.     

喷洒车半实物仿真训练系统研究

“喷洒车半实物仿真训练系统”是集机、光、电、信号处理、模式识别、计算机技术于一体的先进的防化兵洗消实时仿真训练系统，只需将新式装备的三维模型导入到系统中就可以完成对各种新式装备的训练任务。系统基于软件平台Multigen Creator和Vega Prime开发，采用激光定位技术、实时图像识别技术、动态构建虚拟战场环境技术、粒子系统技术等实现了洗消分队技术、战术演练，洗消能力评估和新装备洗消作业规范的协同制定。该系统可代替实车完成技．战术训练，产生了显著的军事、经济效益。     

基于图数据库的装备信息联想式查询

在院校、部队教学和训练中，常常需要对武器、装备的相关信息进行查询、比较，这类系统传统上是通过关系数据库技术实现的.但是，由于装备种类之间的差异太大，没有一个共同的“数据模型”可用；另外，关系数据库对于装备之间的“联系”处理起来相当困难，本文提出了基于图数据库的装备信息“联想式”查询，较好地解决了这些问题.     

基于FPGA的嵌入式系统设计

在对现有的IRL实现方案进行分析的基础上,提出了一种新的解决方案——基于FPGA设备驱动的解决方案。该方案使用处理器控制方式结合嵌入式实时操作系统实现了通过互联网进行远程配置的功能,并且具有体系结构简单、跨平台、配置过程灵活快速、硬件成本较低等特点。     

Educational aspects of television subtitling in deaf education†

The increasing availability of microcomputers and video technology in schools is opening the way towards local ‘do-it-yourself’ video subtitling facilities. Over the last five years, many teachers of deaf children have begun to recognize the educational benefits of subtitled television, but the means for effective, yet low-cost, subtitling did not exist. Building on our earlier experience with broadcast-teletext subtitling we initiated work, funded by the Mountbatten Memorial Trust, to fulfil this need.

To gauge the extent of interest in local subtitling, and to gather design data for the project, a national survey of the uses of television and related media in the education of deaf children was undertaken. Existing methods of adapting educational broadcasts to provide access for deaf children were of particular interest in the survey.

As a result of our work, a prototype low-cost subtitling system has been developed, based on video and computer equipment already widely available in schools. Technical details of the system are described in the companion paper. A programme of technical evaluation of the equipment in schools for the deaf and units for hearing impaired children (attached to mainstream and special schools) has just been concluded. A feature of this work has been the close collaboration with teachers of the deaf. As a result of these trials, a commercial system is being produced and guidelines for effective educational subtitling are starting to emerge.