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本文提出了一种专用公开密钥基础框架(PPKI),用于解决大中型企业自建网络(Intranet)与Internet之间的身份认证、通信加密和权限管理等问题。通过研究和开发PPKI的资源管理、证书管理和通讯加密等组成模块。在企业Intranet中部署PPKI,由Internet网络中的客户端IE浏览器向PPKI服务器申请X.509数字证书,并登录网络服务器访问不同权限的资源。从而验证了PPKI的可行性。 相似文献
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伴随物联网技术的迅速发展,Android手机凭借其特有的开放性优势使我们的生活变得更加快捷便利。以Android手机为平台凭借蓝牙技术完成了智能小车系统的设计,提供了一种无线遥控小车的新思路。首先介绍智能小车所要完成的功能,接下来详细阐述系统的软硬件设计。其中手机端的蓝牙与单片机的蓝牙模块 HC‐06分别视为客户端和服务端。客户端是在App Inventor里面进行JAVA编程处理,而服务端则是编写c语言程序进行单片机控制,二者以此进行串口通信。最终结果表明:小车可以接受手机发出的信号并且可以灵活的执行前进、后退、左转、右转、停止等实时控制功能。 相似文献
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This paper proposes a CTI client/server coordination system exclusively for use with a smart phone. The system makes use of a CTI client, performing combined functions of a SIP phone and a Web browser. The proposed CTI client/server coordination system comprises SIP servers and Web servers, both of which are installed in enterprises, and CTI clients that run on smart phones in a mobile environment. Furthermore, the CTI clients perform the function of SIP phone by communicating with SIP servers. In addition, CTI clients can display telephone directories and logging of phone calls stored in Web servers. They can display screens of ordinary Web browsers. Here, one might switch between a SIP phone function and a Web communication screen with merely a single touch of the tab key. Consequently, smart phones in the mobile environment make it possible to conduct telephone meetings while browsing with a Web screen. 相似文献
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针对配网主设备在线监测数据只能在计算机上显示,还不能有效地接入移动终端这一问题,设计并开发了基于3G/4G网络的配网主设备监测平台。在WAMP集成环境和Eclipse开发环境下,选定JSON作为客户端与服务器的传输格式,利用XML语言实现页面设计,使用PHP语言和JAVA语言分别实现服务器端和Android客户端的整体设计和软件功能。最后以基于频率响应分析(frequency response analysis,FRA)的变压器绕组变形带电检测数据为例,按照软件测试的方法和要求对客户端进行了真机上的测试,测试结果表明本文开发的配网主设备监测平台客户端可以在Android智能手机上平稳高效运行,证明设计方案切实可行。 相似文献
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在行业应用背景下,针对行业信息采集与传输的特点,研究设计了一套基于移动终端的数据智能远传系统.研究了行业数据的管理和传输方法,在TCP/IP协议的基础上,利用Socket通信机制,设计了手持终端与服务器之间的应用层无线数据传输协议,制订了数据交换格式、传输格式和传输内容,实现了手持终端与服务器之间的信息有效交互.初步应用表明,该系统在进行数据远传时,丢包率低,传输速度快,适合行业数据的无线传输,为行业数据远传提供了框架,符合智慧城市的发展要求,拥有良好的通用性与扩展性. 相似文献
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设计了一种利用iPhone手机终端和RT5350模块互传指令和数据的无线通信系统。系统通过建立一个无线局域网平台,以STM32单片机和RT5350模块作为硬件平台,以搭载IOS系统的智能手机作为客户端,结合TCP/IP传输协议和串口传输协议,实现了视频数据流、手机控制指令、以及相关数据的无线传输。此系统不仅实现了控制指令的下传,还实现了数据信息的上传。经测试,该无线通信系统在35 m范围内能够流畅的查看摄像头拍摄的视频,进行无错控制和无错数据传输,并且两个传输过程互不干扰。 相似文献
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人们对生活体验的要求越来越高,Android智能手机带给人们更快捷舒适的操作,WIFI无线信息传输技术日趋成熟。将WIFI无线传输方式用到智能家居照明系统,由Android智能手机终端进行控制成为一种发展趋势。STM8S103单片机作为核心控制器,由WIFI无线方式进行信息传输,结合手机终端控制程序,实现智能家居照明系统的设计。能轻松的利用Android手机对室内灯源进行开关、调光等控制,具有很好的应用和体验效果。 相似文献
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随着移动终端在智能电网中的广泛应用,如何确保移动终端更加安全地接入电力信息网亟待解决。针对现有加密SD卡的安全体系公钥算法大多采用RSA算法的现状,提出了电力移动终端采用国产SM2密码体系的SD卡安全接入方案,对SM2密码体系的SD卡、设计方案的网络和应用架构进行了详细分析。并以Android手机作为电力移动终端,对安全接入方案的代理功能和SD卡安全应用功能进行了测试分析,证明了该方案的可行性和安全性,该SD卡目前已在某省级电网试点应用,实际系统运行表明,方案有利于提高电力移动终端信息安全主动防御能力及实现电力信息安全产品国产化。 相似文献
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地理信息技术已广泛应用于各领域,与人们日常工作和生产紧密相关。手机定位导航系统可以减少巡视的工作量,有效提高巡检效率,同时可为设备缺陷管理提供可靠信息,从而提高设备的可用率,杜绝设备事故,保证电力生产的安全运行。文章研究了移动GIS、无线网络、移动定位及数据安全加密等关键技术,设计了基于GIS的手机定位导航系统。并以天津市电力公司白庙变电站为例,结合手机定位功能,成功实现了手机GIS导航功能。该系统由手机终端、手机GIS导航数据服务器及相关安全隔离装置组成,不需为员工购买专业的手持终端,可直接利用手机进行应用,具有良好的应用前景。 相似文献
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An approach to automation of remote energy monitoring of a mobile object with an electric drive is suggested. The approach is focused on solving the problem of generating statistics using analysis of energy consumption profiles. Structural solutions to arranging a system providing collection, transmission, and processing of measuring information from mobile object energy customers are considered. Based on the mixed implementation, a scheme of the measuring unit including a set of temperature, voltage, current, and speed sensors is developed. A data exchange scheme corresponding to the upper level of energy monitoring automation is developed. The control level in the scheme is established by JEVis local and global information systems with an open source. It is proposed to use a VIDA44M module remote telemetry and control line as a controller to collect data. The modules of the energy monitoring system can be supported by one server or distributed among several ones forming a cloud server. The data collection controllers communicate wirelessly with the server. The main calculation parameters of mobile object power supply, as well as the results of energy profile processing using hardware-in-the-loop simulations of the static and dynamic electric drive load, are considered. Based on the graphic profiles obtained by automated energy monitoring, one can assess the energy consumption of mobile objects, including public transport vehicles in a specific form, compare flow rates between similar objects, reveal faults or improper adjustment of the equipment, rank objects in power consumption, work out solutions to replace inefficient parts and mechanisms, predict power consumption, etc. As a result, power supply indices can be calculated and energy efficiency can be estimated; in addition, as energy audit of a transport company can be carried out and management decisions concerning energy efficiency can be suggested. 相似文献
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分布式线路故障诊断系统作为特高压输电线路故障位置定位服务的关键产品,对电力系统的安全、可靠与经济运行具有重要意义。结合实际系统的研制与应用,提出了一种基于分布式安装的线路监测终端、监测运维中心站和移动终端应用服务于一体的新型故障诊断服务系统。阐述了产品与系统的关键实现方案,并提出了基于监测终端的供能及其管理、高速采样及同步、时间同步及坐标定位、行波启动及识别处理技术,基于监测运维中心站的双机冗余和数据安全隔离、测距和故障识别、GIS信息与微气象服务技术以及移动终端App安全服务等自主关键技术。所述系统产品顺利通过国家权威检测机构组织的测试与认证并在西部特高压交流1 000 kV输电线路上挂网运行,取得了稳定可靠运行的实际效果。 相似文献
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Masashi Ohchi Tatsuya Furukawa Hisao Tokushima Shinichi Sasaki 《IEEJ Transactions on Electrical and Electronic Engineering》2008,3(2):212-221
The purpose of this paper is to detail the development of an autonomous mobile robot and a control support system. The robot has five infrared sensors and three ultrasonic sensors to enable it to follow a ‘ guide person’ with an infrared ray transmitter. The robot will follow the infrared rays emitted by a transmitter with the guide person, and move to the destination. The control system has been developed by the network technology based on server/client model. The advanced control strategy for the autonomous mobile robot is carried out with a high‐speed host server computer connected through the TCP/IP network. Therefore, it is enough for the CPU of the robot to be of low speed. In this paper, the autonomous mobile robot system and the control system using the server/client model are described. Copyright © 2008 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. 相似文献
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This paper presents the design, implementation, and evaluation of a novel camera‐based information transmission system for indoor positioning and navigation. This system, which avoids the use of any expensive equipment, is of particular benefit for infrastructure consumption and is completely portable using a handheld terminal. A high‐intensity light‐emitting diode (LED) tube, which is expected to be the main illumination source for the next generation due to its lower power cost and longer lifetime, is utilized as an optical beacon in the system. LED tubes are encoded to transmit ID information, which is received by a single normal camera. The handheld computing terminal, a mobile phone for example, can query a database after performing ID recognition and, finally, the position and orientation of the terminal can be obtained. Experimental results confirm the accuracy of the system in terms of both position and orientation, and it is suitable for many indoor navigation applications. © 2012 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. 相似文献
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基于安卓平台的脑-心电远程监控系统 总被引:1,自引:0,他引:1
随着安卓手机的硬件性能的不断提高,使得日常生活中的生理检测成为可能。为此,设计了一种便携的基于安卓平台的脑-心电监护系统。该系统由脑-心电采集模块、WiFi模块、数据处理和监测模块和医疗服务器组成。由脑-心电采集模块采集到的数据,通过WiFi模块将数据转传输至安卓手机显示和分析。安卓手机通过互联网、3G等将信息传输给医疗服务器做进一步分析和诊断。为了确保信号处理的实时性,安卓手机针对脑电采用排序熵分析方法,针对心电采用二进离散小波(DDWT)分析。整个系统为用户提供了一个可靠的家用健康监护平台。 相似文献
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首先简单介绍DALI协议。在分析整个智能照明系统的基础上,设计一种基于客户机/服务端(C/S)架构的系统,在Android操作系统的智能手机上面开发客户端软件,并在Windows环境下使用VB6.0开发服务器端软件。客户端软件和服务器软件在构建的局域网中验证通过。 相似文献