电力行业安全规范考试监训系统设计与实现

本文通过对电力行业安全规范训练考试的特点进行分析,总结出一套适合电力行业安规训练考试的方法,并通过信息化手段实现电力安全规范试题的在线训练和在线统一考试.安全规范考试监训系统必须符合电力行业易用的考试界面、灵活的考试配卷、多样的考试类型、及时的试题更新、方便的考生选择、实用的错题遴选、便捷的移动训练等特点,在丰富电力行业员工安规学习考试手段的同时,加深员工对电力行业安规的理解,在施工维护时能按照安规要求进行规范操作.     

ABAP在SAP系统开发中的应用

SAP系统作为全球最大的ERP系统之一,具有高度的灵活性和集成性,并且提供了一系列编程接口以便进行二次开发。主要针对ERP系统实施过程中报表和表单开发,简要介绍了SAP系统ABAP开发平台的特性,分析了基于ABAP开发平台的程序的开发过程以及影响运行性能的相关因素和解决原理,分别针对ABAP算法、数据库等方面提出了优化程序的几种方法。     

一种基于SAP的企业规章制度管理系统

文章针对云南电力研究院目前存在的规章制度种类繁多,版本控制困难和过期制度修订不及时的缺点,提出了一种基于SAP系统的规章制度管理方式.本文利用企业资源管理中的SAP系统平台,采用SAP开发中常用的ABAP开发语言,运用工作流技术及后台作业技术,实现了电力研究院规章制度管理系统.通过该系统的上线运行,实现了办公智能化,减少了云南电力研究院办公室人员的制度管理工作量,提高制度修订的及时性,更好地控制制度版本.     

运用二维码技术设计库房管理系统

以.net为平台,利用c#语言开发了一款二维码打印系统。此系统通过ERP系统中的物资出入库情况,利用XI接口技术,选择需要管理的物资进行二维码打印,并将打印出的条码黏贴到物资上面,实现物资的全生命周期监控。     

Bootloader下USB接口镜像下载方案研究与实现

镜像下载功能是嵌入式系统中bootloader程序的一个重要功能,对嵌入式系统开发效率影响较大.本文在USB设备的功能单元层定义了简单的数据传输协议,并基于此协议在PXA255平台上实现了bootloader下的镜像下载功能,实践证明该方案可以在简单的硬件配置上达到较快的传输速度.     

基于VB的试题库系统的设计与实现

随着计算机技术及人工智能的发展,组卷系统的研究逐渐被越来越多的专家学者所关注,同时也改变了学校的教育观念、教学模式及考试模式。本文在分析国内外大量文献的基础上,基于随机算法,针对考试系统的自动组卷问题,介绍了基于VisualBasic语言的试题库平台的设计与实现方案,详细讨论了该系统的设计特点和主要功能。本系统用于实现试题输入、查询及试卷的生成、编辑、打印功能,在最大程度上满足出题者的各项要求,其中组卷程序实现了从试题库中随机抽取,使生成的试卷合理化、规范化、科学化。投入运行结果表明,抽取随机、无法预知、快速组卷,克服了试卷中的人为因素,增强了试卷的保密性。     

SAP系统打印在企业应用的问题

本文系统的论述SAP打印的各种方式和应用范围,尤其针对SAP打印在企业里实际的问题,如何有针对性的判断问题产生的原因及解决方案,供读者参考.     

青海省电力公司物资管理指标预警的功能设计与开发

根据业务要求,青海省电力公司基于ERP系统开展物资管理指标预警的开发建设工作。本文立足于项目建设,阐述了业务背景、功能设计、系统实现等内容,并对功能建设的成效及意义进行了分析总结。     

计算机职称考试系统中选择题选取的设计与实现

针对计算机技术用于教学考试中的问题进行了初步探索,结合在职人员计算机职称考试的实际情况,并根据东南大学对此的具体需求,研制了一个计算机职称考试系统.该系统基于客户/服务器结构、使用VB6.0开发环境开发,具有职称考试考题选取、答题、考生答案存储、自动批卷评分及文件加解密等功能.     

一个基于指纹生物特征识别的网上在线考试系统的设计

随着我国综合国力的提高,一些高新技术得到了广泛应用,网上在线考试系统已开始进入实用阶段。网上在线考试系统的安全是开发此类系统的重要设计功能,一个基于指纹生物识别的网上在线考试系统比一般的更准确地反映了考试的真实性。给出基于指纹生物识别的网上在线考试系统的安全设计,并给出细节特征点的指纹识别算法。     

面向Java语言的代码安全

Java语言是一种面向网络的编程语言,通过网络下载Java代码并在本地系统执行是经常的事,但这样可能会危及本地系统安全。虽然Java语言提供了安全编程环境,但是它并没有提供一个完善的下载、运行代码的安全系统。本文以Java安全体系结构为中心详细介绍了Java语言主要安全特性和技术,给出了一种新型的解决网络环境中Java代码安全问题的系统,该系统应用类封装技术实现精细安全策略的安全策略编辑器。     

傅立叶计算全息数字水印在彩色图像印刷防伪中的应用

设计了一种针对彩色图像打印-扫描过程的基于傅立叶计算全息技术的数字水印系统.在该系统中我们首次提出将傅立叶计算全息数字水印技术应用于彩色图像印刷防伪,并为之设计了相应的提取程序.该系统与目前其他的针对打印-扫描过程的数字水印系统相比,具有抗剪切、盲检测、水印信息量大等特点.在彩色图像印刷防伪方面具有明显的应用前景.     

基于Word文档的试题库系统的实现

讨论了在试题库系统建设中如何利用Ole Automation技术实现含有公式、图片的试题数据的访问，包括试题的添加、读取、显示和编辑以及试卷的生成，并给出了在Delphi和Access环境下的实现方法。     

Database management system for conference program preparation

A database management system for organizing the program of a conference is described. The system runs on an IBM-compatible personal computer with hard disk using DBASEIII-PLUS. The system is used for logging papers submitted for review, writing letters of acknowledgement, distributing and tracking papers in the review process, writing letters that notify authors of paper disposition, communicating with session chairmen, and automatically compiling and printing the resultant camera-ready program and author mailing labels. The system has been successfully used for the 1988 IEEE International Conference on Acoustics, Speech, and Signal Processing, a conference of 1500 submitted papers with a program of 750 papers presented in 56 sessions over four days. Use of the system saved six weeks and about $3000 compared to the time and costs of this conference in 1987     

Efficient complementary caching for ISP-aware networks

Internet service providers(ISPs) have taken some measures to reduce intolerable inter-ISP peer-to-peer(P2P) traffic costs,therefore user experiences of various P2P applications have been affected.The recently emerging offline downloading service seeks to improve user experience by using dedicate servers to cache requested files and provide high-speed uploading.However,with rapid increase in user population,the server-side bandwidth resource of offline downloading system is expected to be insufficient in the near future.We propose a novel complementary caching scheme with the goal of mitigating inter-ISP traffic,alleviating the load on servers of Internet applications and enhancing user experience.Both architecture and caching algorithm are presented in this paper.On the one hand,with full knowledge of P2P file sharing system and offline downloading service,the infrastructure of complementary caching is designed to conveniently be deployed and work together with existing platforms.The co-operational mechanisms among different major components are also included.On the other hand,with in-depth understanding of traffic characteristics that are relevant to caching,we develop complementary caching algorithm with respect to the density of requests,the redundancy of file and file size.Since such relevant information can be real-time captured in our design,the proposed policy can be implemented to guide the storage and replacement of caching unities.Based on real-world traces over 3 months,we demonstrate that the complementary caching scheme is capable to achieve the ’three-win’ objective.That is,for P2P downloading,over 50% of traffic is redirected to cache;for offline downloading,the average server-dependence of tasks drops from 0.71 to 0.32;for user experience,the average P2P transfer rate is increased by more than 50 KB/s.     

Privacy-preserving and accountable on-the-road prosecution of invalid vehicular mandatory authorizations

Nowadays, improving road safety is one of the major challenges in developed countries and, to this regard, attaining more effectiveness in the enforcement of road safety policies has become a key target. In particular, enforcing the requirements related to the technical and administrative mandatory documentation of on-the-road motor vehicles is one of the critical issues. The use of modern technologies in the context of Intelligent Transportation Systems (ITS) could enable the design of a more convenient, frequent and effective enforcement system compared to the traditional human patrol controls. In this article we propose a novel system for the on-the-fly verification of mandatory technical and administrative documentation of motor vehicles. Vehicles not complying with the required regulations will be identified and sanctioned whereas those vehicles, observant of the mandatory regulations, will maintain anonymity and non-traceability of their whereabouts. The proposed system is based on the use of anonymous credentials which will be loaded onto the vehicle to automatically and on-the-fly prove holdership of required credentials without requiring the vehicle to stop beside the road. We also implement a prototype of the credential system and analyze the feasibility of our solution in terms of computational cost and time to perform such telematic controls.     

Printed passive matrix addressed electrochromic displays

Flexible displays are attracting considerable attention as a visual interface for applications such as in electronic papers and paper electronics. Passive or active matrix addressing of individual pixels require display elements that include proper signal addressability, which is typically provided by non-linear device characteristics or by incorporating transistors into each pixel. Including such additional devices into each pixel element make manufacturing of flexible displays using adequate printing techniques very hard and complicated. Here, we report all-printed passive matrix addressed electrochromic displays (PMAD), built up from a very robust three-layer architecture, which can be manufactured using standard printing tools. Poly(3,4-ethylenedioxythiophene) doped with poly(styrenesulfonate) (PEDOT:PSS) serves as the conducting and electrochromic pixel electrodes and carbon paste is used as the pixel counter electrodes. These electrodes sandwich self-assembled layers of a polyelectrolyte that are confined to desired pixel areas via surface energy patterning. The particular choice of materials results in a desired current vs. voltage threshold that enables addressability in electronic cross-point matrices. The resulting PMAD operates at less than 3 V, exhibits high colour switch contrast without cross-talk and promises for high-volume and low-cost production of flexible displays using reel-to-reel printing tools on paper or plastic foils.     

车载酒精锁

酒后驾车,是引起交通事故的重要原因,主要是司机安全意识淡薄,不能自觉的遵守交通法规。针对此克服了被动检测,能在第一时间进行有效的进行检测和处理。介绍了硬、软件的结构和组成,并研究了系统的可行性。     

Model of downloading strategy from peers and server for saving server bandwidth in P2P VoD system

In peer-to-peer(P2P)video on demand(VoD)system,once the P2P downloading rate cannot satisfy the need of playback,server is quickly referred to for help in providing enough bandwidth.Thus the switch of downloading from other peers(P2P)and server(HTTP)exists.This paper uses the proportion of P2P downloading amount(PPDA)during the video watching process to measure server load.This article is interested in finding a better strategy or switch rule between P2P and HTTP downloading for saving server bandwidth.The authors suggest and model a kind of switch rule based on local buffer amount,using mathematical theory of Brownian motion.It can effectively alleviate the impact of P2P rate fluctuation,reduce the switch times and improve the PPDA by at least 3%-5% on the basis of the former switch rule,which means substantial cost can be saved.Particularly the PPDA is related with the ratio of playback bit rate to the HTTP downloading rate which means the PPDA can be restricted by controlling the ratio in the real-world system.Though the result comes from constant bit rate(CBR)video supposition,it provides perspective and method for variable bit rate(VBR)application,and valuable insights for the future development of P2P VoD system.     

Parallel and multi-wavelength downloading in optical grid networks

In optical grid networks, data files for job execution are replicated at multiple sites in order to distribute loads and achieve high performance computing. Those replicas are downloaded in parallel in order to reduce downloading time. Furthermore, each replica is downloaded with multiple wavelengths. Although parallel and multi-wavelength downloading reduce downloading time, they raise blocking probability of file downloading. This is because they use a lot of wavelength resources and thus often generate bottleneck links. To resolve this problem, this paper proposes a parallel and multi-wavelength downloading scheme for optical grid networks. The proposed scheme provides replica selection, route selection, and wavelength selection for parallel and multi-wavelength downloading. In the proposed scheme, clients dynamically select combinations of a replica, a route, and a wavelength in such a way that they suppress the generation of bottleneck links. Through simulation experiments, we show that the proposed scheme efficiently improves blocking probability of parallel and multi-wavelength downloading.