针对目前汽车追尾事件频发问题,提出一种防汽车车前和车后追尾的安全装置设计。该设计以高性能、低功耗的8位AVR微处理器ATmega8L为核心,结合霍尔式车速传感器、激光雷达测距装置和MMA7260QT加速度传感器,能够兼顾车前和车后,摒弃以往设计中只考虑车前或车后单一性缺点,尤其适用于高速、夜晚或新手行车。 Abstract: Aiming at the high frequency of vehicle rear-end collision,a safe device design of anti-vehicle rear-end collision is presented.In the design,the high-performance,low-power8-bit AVR microprocessor ATmega8L is utilized as a core combined with Hall-type speed sensor,laser-radar ranging devices and the acceleration sensor MMA7260QT.The design considers both the front and back of a car,and overcomes the drawbacks of former designs in which only the front or the back of the car is considered,so it is especially suitable for high-speed,night or the beginner’s driving.
上传时间: 2013-10-14
上传用户:GavinNeko
提出了一种基于C8051F320的列车安全巡检仪的设计方案,详细阐述了巡检仪的各个模块的硬、软件设计。巡检仪集信息采集、轴温检测、照明和记录存储等功能于一体,实现了对列车安全巡检工作有效的监督和科学管理。系统软件采用C51编写,对单片机进行有效的电源管理,保证了巡检仪的稳定性、可靠性和低功耗性。 Abstract: This paper puts forward a design of train safety inspection based on C8051F320,describes all modules hardware and software design of inspection instrument.The inspection instrument has the function of information collection, axle’s temperature detection, lighting and records storage.It can supervise and administer train safety inspection work effectively.The system software using C51 can manage the power of single chip microcomputer, and guarantee the stability, reliability and low power consumption of the inspection instrument.
上传时间: 2013-12-22
上传用户:落花无痕
摘要:本文阐明了单片机在电力系统安全统计上的应用与设计方法。几年来,通过一些单位的实际应用,已证实了使用单片机进行自动控制的优越性。 关键词:单片机;自动控制;软件
上传时间: 2013-11-07
上传用户:wenyuoo
摘要: 本文在研究了网络安全的国内外有关情况后对网络安全技术进行了探讨,介绍了一种简单而实用的网络安全产品,添补了这方面的空白,而且本文介绍的产品已经应用到了许多部门,为网络安全做出了贡献.关键词: 网络;安全;Internet;黑客;物理隔离;MT8870
上传时间: 2013-11-20
上传用户:1318695663
This white paper discusses how market trends, the need for increased productivity, and new legislation have accelerated the use of safety systems in industrial machinery. This TÜV-qualified FPGA design methodology is changing the paradigms of safety designs and will greatly reduce development effort, system complexity, and time to market. This allows FPGA users to design their own customized safety controllers and provides a significant competitive advantage over traditional microcontroller or ASIC-based designs. Introduction The basic motivation of deploying functional safety systems is to ensure safe operation as well as safe behavior in cases of failure. Examples of functional safety systems include train brakes, proximity sensors for hazardous areas around machines such as fast-moving robots, and distributed control systems in process automation equipment such as those used in petrochemical plants. The International Electrotechnical Commission’s standard, IEC 61508: “Functional safety of electrical/electronic/programmable electronic safety-related systems,” is understood as the standard for designing safety systems for electrical, electronic, and programmable electronic (E/E/PE) equipment. This standard was developed in the mid-1980s and has been revised several times to cover the technical advances in various industries. In addition, derivative standards have been developed for specific markets and applications that prescribe the particular requirements on functional safety systems in these industry applications. Example applications include process automation (IEC 61511), machine automation (IEC 62061), transportation (railway EN 50128), medical (IEC 62304), automotive (ISO 26262), power generation, distribution, and transportation. 图Figure 1. Local Safety System
上传时间: 2013-11-05
上传用户:维子哥哥
FPGA 具有轻松集成与支持新协议和新标准以及产品定制的能力,同时仍然可以实现快速的产品面市时间。在互联网和全球市场环境中,外包制造变得越来越普遍,这使得安全变得更加重要。正如业界领袖出版的文章所述,反向工程、克隆、过度构建以及篡改已经成为主要的安全问题。据专家估计,每年因为假冒产品而造成的经济损失达数十亿美元。国际反盗版联盟表示,这些假冒产品威胁经济的发展,并且给全球的消费类市场带来重大影响。本白皮书将确定设计安全所面临的主要威胁,探讨高级安全选择,并且介绍Xilinx 的新型、低成本SpartanTM-3A、Spartan-3AN 和Spartan-3A DSP FPGA 如何协助保护您的产品和利润。
上传时间: 2014-12-28
上传用户:松毓336
Spartan-3AN 器件带有可以用于储存配置数据的片上Flash 存储器。如果在您的设计中Flash 存储器没有与外部相连,那么Flash 存储器无法从I/O 引脚读取数据。由于Flash 存储器在FPGA 内部,因此配置过程中Spartan-3AN 器件比特流处于隐藏状态。这一配置成了设计安全的起点,因为无法直接从Flash 存储器拷贝设计。
上传时间: 2013-11-04
上传用户:sammi
为了提高Linux操作系统的网络安全性,对Linux系统的安全机制、网络安全问题、主要攻击方式进行了详细分析,提出了基于Linux系统用户管理、文件管理、预防攻击、数据备份等切实可行的网络安全策略,增强了Linux系统的网络安全性,达到了较好的效果。
上传时间: 2013-12-18
上传用户:weiwolkt
随着3G应用的快速发展,移动通信系统的安全性至关重要, 特别是针对安全敏感的应用。本文研究了第三代移动通信系统的信息安全机制, 包括第三代移动通信系统面临的信息安全威胁等。在此基础上对以3G智能手机为代表的移动终端的安全使用提出了一些方法。
上传时间: 2013-11-20
上传用户:nairui21
云计算是继个人计算机、互联网之后的第三次信息化革命,给整个信息产业带来巨大的推动力。但是,安全性已经成为云计算面临的最大挑战,它关系着用户对云计算应用的信心。针对目前云计算存在的诸多安全问题,文中提出信息安全风险链条主要包括终端用户、服务商和网络传输3个环节,并着重分析各环节存在的安全问题,最后给出云计算的信息安全框架,以期引起人们对于云计算信息安全问题的重视,并为更好地推进云计算应用提供有效保障。
上传时间: 2013-10-08
上传用户:极客