排序方式: 共有111条查询结果,搜索用时 13 毫秒
91.
Adaptive Binary Splitting: A RFID Tag Collision Arbitration Protocol for Tag Identification 总被引:2,自引:0,他引:2
In the RFID system, a reader recognizes tags through communications over a shared wireless channel. When multiple tags transmit
their IDs at the same time, the tag-to-reader signals lead to collision. Tag collision arbitration for passive RFID tags is
significant for fast identification since collisions disturb the reader's identification process. This paper presents an Adaptive Binary Splitting (ABS) protocol which is an improvement on the binary tree protocol. To reduce collisions and identify tags efficiently, ABS uses
information which is obtained from the last processes of tag identification. Our performance evaluation shows that ABS outperforms
other tree based tag anti-collision protocols.
This work was supported by Korea Research Foundation Grant (KRF-2005-041-D00680). 相似文献
92.
飞机鸟撞事故分析、预防及建议 总被引:15,自引:0,他引:15
周加良 《宁波大学学报(理工版)》1994,(1)
简要介绍了飞机鸟撞的危害,产生的原因及乌情等。并着重介绍了预防鸟撞航空工业,机场防止鸟撞方法和急需开展鸟情研究的有关课题内容和建议建立《中国鸟撞委员会》等。 相似文献
93.
提出了一种基于分组自适应多叉树的RFID防碰撞算法,该算法将标签分为多组并按分组处理标签,减少同一时刻同时响应的标签的数目,从而减少碰撞发生的概率,对同一分组的标签,按照碰撞因子自动选择动态二叉树或动态四叉树搜索,同时采用后退策略。仿真结果表明,该算法在平均查询次数及传输数据量上较其他算法都有较大提高. 相似文献
94.
将力学概念与实际相结合,引入工程案例来讲解有关知识点,可提升学生的学习兴趣,并提高学生理论与实践相结合的能力。简介了桥梁、桥梁支座与基础,对桥墩受竖向冲击与水平冲击时的力学模型分别进行了简化。针对简化的桥墩模型,对比分析在动载荷作用下桥墩未加与施加橡胶隔震支座、未加与施加防撞墩前后的变形、动荷系数,据能量守恒原理分析讨论相关问题,提高学生对相关力学概念的理解能力。 相似文献
95.
在射频识别(Radio Frequency Identification,RFID)系统中,针对EPC C1G2协议的Q算法中Q值调整的不灵活性及对空闲时隙和碰撞时隙处理上的缺点,提出了一种基于连续时隙预测的帧时隙Aloha防碰撞算法.通过马尔可夫时隙状态模型,分析不同连续时隙状态下帧长与标签数的关系,提出连续时隙预测机制和自适应散列方案.有效地减少了无效时隙的出现,实现了读取阶段的时隙多数为成功时隙.仿真结果表明,本文提出的算法能够灵活地调整帧长,有效提高吞吐率,降低传输延时和开销,为物联网(Internet of Things,IoT)的海量数据信息完整性问题提供了合理的解决方案. 相似文献
96.
数据碰撞是影响射频识别(RFID)系统识别效率的主要因素。目前,常用的防碰撞算法是ALOHA算法和二进制树搜索算法,但这两类算法都还不能完全解决标签碰撞问题,尤其是当待识别的标签数量较大且标签ID序列号较长时,识别速度相当慢。为此提出一种多枝查询树协议,采用均衡不完全区组设计(BIBD)对标签ID进行编码,并用16位的BIBD码作为读写器查询前缀符号。理论分析和仿真结果表明,这种协议的性能较传统的防碰撞协议有明显改善。 相似文献
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99.
结合非接触式人体感应探测、无线传输技术,介绍一种基于GPRS的电力行业变电设备防盗系统组网及设计架构,包括自适应人体感应探测器原理设计、GPRS数据终端设备的通信机理及多点并发数据防冲撞技术方案、供电自动切换电路及系统软件功能的设计与实现等。系统集智能化、高可靠性及布防便捷于一体,可以解决电力设施经常被盗的难题。 相似文献
100.
Collision and security issues are considered as barriers to RFID applications.In this paper,a parallelizable anti-collision based on chaotic sequence combined dynamic frame slotted aloha to build a high-efficiency RFID system is proposed.In the tags parallelizable identification,we design a Discrete Markov process to analyze the success identification rate.Then a mutual authentication security protocol merging chaotic anti-collision is presented.The theoretical analysis and simulation results show that the proposed identification scheme has less than 45.1%of the identification time slots compared with the OVSF-system when the length of the chaos sequence is 31.The success identification rate of the proposed chaotic anti-collision can achieve 63%when the number of the tag is100.We test the energy consumption of the presented authentication protocol,which can simultaneously solve the anti-collision and security of the UHF RFID system. 相似文献