Context-Aware Rate-Adaptive Beaconing for Efficient and Scalable Vehicular Safety Communication

Vehicular safety applications, such as cooperative collision warning systems, rely on beaconing to provide situational awareness that is needed to predict and therefore to avoid possible collisions. Beaconing is the continual exchange of vehicle motion-state information, such as position, speed, and heading, which enables each vehicle to track its neighboring vehicles in real time. This work presents a context-aware adaptive beaconing scheme that dynamically adapts the beaconing repetition rate based on an estimated channel load and the danger severity of the interactions among vehicles. The safety, efficiency, and scalability of the new scheme is evaluated by simulating vehicle collisions caused by inattentive drivers under various road traffic densities. Simulation results show that the new scheme is more efficient and scalable, and is able to improve safety better than the existing non-adaptive and adaptive rate schemes.

A tensile wearable SHF antenna with efficient communication in defense beacon technology

The study projects a flexible and compact wearable pear-shaped Super High Frequency(SHF)antenna that can provide detailed location recognition and tracking applicable to defense beacon technology.This mini aperture with electrical dimensions of 0.12λ_(0)×0.22λ_(0)×0.01λ_(0)attains a vast bandwidth over 3.1-34.5 GHz Super High Frequency(SHF)frequency band at S_(11)≤-10 dB,peak gain of 7.14 dBi and proportionately homogeneous radiation pattern.The fractional bandwidth(%BW)acquired is 168%that envelopes diversified frequency spectrum inclusive of X band specifically targeted to all kinds of defense and military operations.The proposed antenna can be worn on a soldier's uniform and hence the Specific Absorption Rate simulation is accomplished.The Peak SAR Value over 1 g of tissue is 1.48 W/kg and for 10 g of tissue is 0.27 W/kg well under the safety standards.The flexibility is proven by analyzing the full electromagnetic simulations for various bending conditions.Time response analysis is attained with its Fidelity Factor and Group Delay.Communication excellence is determined using Link Budget Analysis and it is seen that margin at 100 Mbps is 62 m and at 200 Mbps is 59 m.Prototype is fabricated along with experimental validation.All the results show harmony in shaping the antenna to provide critical situational awareness and data sharing capabilities required in defense beacon technology for location identification.

Development and Application of Detection Methods for Capture and Transcription Elongation Rate of Bacterial Nascent RNA

Objective Detection and quantification of RNA synthesis in cells is a widely used technique for monitoring cell viability,health,and metabolic rate.After exposure to environmental stimuli,both the internal reference gene and target gene would be degraded.As a result,it is imperative to consider the accurate capture of nascent RNA and the detection of transcriptional levels of RNA following environmental stimulation.This study aims to create a Click Chemistry method that utilizes its property to capture nascent RNA from total RNA that was stimulated by the environment.Methods The new RNA was labeled with 5-ethyluridine(5-EU)instead of uracil,and the azido-biotin medium ligand was connected to the magnetic sphere using a combination of“Click Chemistry”and magnetic bead screening.Then the new RNA was captured and the transcription rate of 16S rRNA was detected by fluorescence molecular beacon(M.B.)and quantitative reverse transcription PCR(qRT-PCR).Results The bacterial nascent RNA captured by“Click Chemistry”screening can be used as a reverse transcription template to form cDNA.Combined with the fluorescent molecular beacon M.B.1,the synthesis rate of rRNA at 37℃is 1.2 times higher than that at 15℃.The 16S rRNA gene and cspI gene can be detected by fluorescent quantitative PCR,it was found that the measured relative gene expression changes were significantly enhanced at 25℃and 16℃when analyzed with nascent RNA rather than total RNA,enabling accurate detection of RNA transcription rates.Conclusion Compared to other article reported experimental methods that utilize screening magnetic columns,the technical scheme employed in this study is more suitable for bacteria,and the operation steps are simple and easy to implement,making it an effective RNA capture method for researchers.

隧洞施工人员U-Beacon定位系统设计与开发

针对传统UWB定位技术在大范围隧洞内人员定位中存在布线成本高、施工周期长、风险高的问题,结合UWB定位技术和Beacon技术,提出一种基于U-Beacon的隧洞内人员定位系统,并针对隧洞复杂施工场景进行定位系统网络拓扑结构设计、U-Beacon定位系统部署方案设计及硬件电路设计。以施工人员佩戴便携式胸卡标签方式,提高系统易用性。采用TOA定位算法和Sage-husa自适应卡尔曼滤波算法对UWB测距数据进行定位和降噪处理,实现对洞室复杂施工环境的精准定位。实验结果表明,基于U-Beacon的人员定位系统大大降低施工成本,降低施工风险,同时Sage-husa自适应滤波算法在提高隧洞内定位精度和鲁棒性方面有很大的提升。

Optimized beaconing rate control for vehicular Ad-hoc networks

In vehicular Ad-hoc networks （VANETs）, beacon message is designed for the purpose of periodically broadcasting the status information （velocity, direction, etc.）, which enable neighbor awareness and support some safety applications. However, under high density scenarios, fixed rate beaconing can cause severe congestion and lower the deliver rate of beacons and other kinds of messages. In this paper, we describe beaconing rate control approach with an one-dimensional Markov model, and based on this, an optimized beacon rate control scheme is proposed which aims to mitigate the congestion and maximize the deliver efficiency of beaconing. Analytical and simulation results show that our proposed scheme can achieve higher adaptability and beaconing efficiency compared with other schemes in various environments.

Adaptive beaconing for collision avoidance and tracking accuracy in vehicular networks

In vehicular networks,the exchange of beacons among neighboring vehicles is a promising solution to guarantee a vehicle's safety.However,frequent beaconing under high vehicle density conditions will cause beacon collisions,which are harmful to a vehicle's driving safety and the location tracking accuracy.We propose an ABIwRC(Adaptive Beaconing Interval with Resource Coordination)method for a highway scenario.Each vehicle broadcasts beacon interval requests,including the intervals needed for both the vehicle's driving safety and location tracking accuracy.The RSU(Road Side Unit)allocates resources for a vehicle's beaconing according to the requests from all vehicles and the interference relationship between the vehicles in adjacent RSUs.We formulate a resource allocation problem for maximizing the sum utility,which measures the satisfaction of vehicles'requests.We then transform the optimization problem into a maximum weighted independent set problem,and propose an algorithm to solve this effciently.Simulation results show that the proposed method outperforms the benchmark in terms of beacon reception ratio,vehicle driving safety,and location tracking accuracy.

基于蓝牙无线技术的室内定位方法研究

无线室内定位具有较为广泛的应用场景,蓝牙技术在这一领域占据着重要地位。传统蓝牙室内定位技术在实际应用中表现出一定缺陷,通过改进型的蓝牙指纹室内定位算法,提升定位能力。以蓝牙Beacon技术为基础,文章介绍了蓝牙接收信号强度修正、信号传播路径损耗系数计算以及改进型蓝牙室内定位算法等模型,结合实际检测与软件仿真,对各类算法模型的应用效果和精确性等开展检验。结果显示,设计算法在定位精确度方面优于传统的蓝牙指纹定位算法。

Beacon技术在智慧图书馆信息服务中的应用

Beacon技术的出现使得智慧图书馆个性化推送服务成为相关学者和专家研究的话题。为实现室内定位、用户行为分析以及信息推送等服务,研究借助Beacon技术搭建智慧图书馆Eddystone服务平台,该平台利用Eddystone-TLM优化质心定位算法提高定位准确性,并利用URL完成用户信息的推送。Eddystone-TLM改进质心定位算法后,待测点的实际位置和估算位置几乎相同,误差值为0。智慧图书馆Eddystone服务平台能完成室内准确定位、用户行为数据分析、信息推送。

Enhanced Energy Efficient with a Trust Aware in MANET for Real-Time Applications

Mobile ad hoc networks (MANETs) are subjected to attack detectionfor transmitting and creating new messages or existing message modifications.The attacker on another node evaluates the forging activity in themessage directly or indirectly. Every node sends short packets in a MANETenvironment with its identifier, location on the map, and time through beacons.The attackers on the network broadcast the warning message usingfaked coordinates, providing the appearance of a network collision. Similarly,MANET degrades the channel utilization performance. Performancehighly affects network performance through security algorithms. This paperdeveloped a trust management technique called Enhanced Beacon TrustManagement with Hybrid Optimization (EBTM-Hyopt) for efficient clusterhead selection and malicious node detection. It tries to build trust amongconnected nodes and may improve security by requiring every participatingnode to develop and distribute genuine, accurate, and trustworthy materialacross the network. Specifically, optimized cluster head election is done periodicallyto reduce and balance the energy consumption to improve the lifetimenetwork. The cluster head election optimization is based on hybridizingParticle Swarm Optimization (PSO) and Gravitational Search OptimizationAlgorithm (GSOA) concepts to enable and ensure reliable routing. Simulationresults show that the proposed EBTM-HYOPT outperforms the state-of-thearttrust model in terms of 297.99 kbps of throughput, 46.34% of PDR, 13%of energy consumption, 165.6 kbps of packet loss, 67.49% of end-to-end delay,and 16.34% of packet length.

On a Horse Again

I rode a horse called Nansi through some of the 1500 square kilometres of the Brecon Beacons National Park in Wales.Nansi was a Welsh Cob and they are one of the world’s oldest types of horses and live wild in the national park.It was nearly twenty years since I had ridden a horse.

基于微信小程序和Beacon蓝牙的学生打卡系统设计

文章针对学生运动打卡系统的问题,设计了一种基于微信小程序和Beacon蓝牙技术的打卡系统。该系统通过使用Beacon蓝牙技术进行定位,可以在运动场地范围内自动完成打卡,实现快速便捷的运动打卡功能。通过对该系统进行实验和评估,发现其具有较好的可行性和实用性。该系统可以为学生提供更好的运动体验,同时为学校管理和教学提供更好的数据支持和管理手段。

基于事件流和组件的CSCW通用开发平台

提出了一个基于事件流和组件的CSCW开发平台设计方案，并以此构建了Beacon 系统，它支持组件化的开发模式，以事件流处理为核心，全面覆盖了从网络通信、群组通信 、访问控制到并发控制等多个环节，并在对象交互模型、事件处理和并发控制策略方面有所 创新。通过在Beacon系统上开发了几个协同应用程序，验证了该平台具有很强的扩展性、通 用性、稳定性和开发灵活性。

Beacon技术在图书馆的应用探索

在互联网+背景下,文章通过研究Beacon技术在国内外应用的实例,结合图书馆情况,论述该技术在图书馆应用的可行性,提出基于该技术的活动消息推送、馆藏导航、阅读推广、感应借书、阅览室座位管理、阅读分享互动、活动签到等图书馆应用设想,创造全新的智慧服务体验。

面向城市环境VANETS的基于beacon控制的路由协议

车载网络(Vehicular ad hoc networks,VANETs)是一种特殊形式的网络,具有节点高速移动、拓扑频繁的变化的特性,这些特性为消息的传播带来挑战,路由机制是实现消息传递的关键因素;地理位置路由被广泛地应用于VANETS,要求节点周期广播beacon消息;然而,节点周期地广播beacon消息,降低了路由性能,特别是在城市区域,由于节点密集,每个节点均广播beacon消息,恶化了路由性能;为此,针对城市环境,提出基于beacon控制的路由协议RPBC(Routing protocol with beacon control);在RPBC中,并非每个节点广播beacon消息,而设置有效的机制选择部分节点广播,从而降低了beacon冗余,同时,采用最短路径算法,减少数据传输跳数;仿真结果表明,提出的RBPC在分组投递率、端到端传输时延以及路由开销方面均有较好的性能。

基于微信公众平台和iBeacon的智慧校园LBS应用设计

微信公众平台为开发者提供了一个通用的信息服务发布平台,通过约定的身份信息和接口标准,利用微信最新客户端和微信公众平台提供的对蓝牙BLE和i Beacon技术的支持接口,提出了一种通过微信公众平台和i Beacon基站及时获取用户当前位置和场景信息的方法,以LBS签到功能为例,给出了LBS应用实现方案和流程图,叙述了如何将用户信息、用户场景和智慧校园后台系统进行对接和联动的实施细节。

Fast Digital Correlation Calculation Method in Extended Beacon Wavefront Detection

On the basis of Hartmann Shack sensor imaging analysis, a new method is presented with which the wavefront slope can be obtained when the object is incoherent and extended. This method, which is demonstrated by both theoretical interpreting and computer simulation, explains how to measure the wavefront slope difference between two sub apertures through the determination of image displacements on detector plane. It includes a fast and accurate digital algorithm for detecting wavefront disturbance, which is much suitable for realization in such electrical hardwares as digital signal processors.

分众传媒的新媒体融合之路

移动互联网的蓬勃兴起正在颠覆传统媒体的传播模式,在"互联网+"的时代背景下,分众传媒控股有限公司选择借力i Beacon技术,积极谋划战略转型布局,打造中国最大的O2O媒体集团,实现自我进化的新媒体融合之路。本文以分众传媒为例,对其新媒体环境下面临的挑战以及与i Beacon技术的深度融合发展进行研究剖析,旨在思考站在"互联网+"风口的传媒业,如何实现以技术为要的新媒体融合之路。

基于Beacon技术的儿童游乐项目设计研究

体验经济正逐步成为时代的特征,作为体验经济代表的主题公园、游乐场等有着巨大的市场发展空间。针对国内儿童游乐项目缺乏有效的设计及规划,及其服务质量并不能满足儿童消费者的需求等问题,主要运用Beacon技术及大数据处理技术,为儿童游乐项目设计提供一些新的思路和方法。即以Beacon位置感知技术为基础形成大数据,通过大数据技术结合体验设计理论,分析儿童对游乐项目的需求、体验感受、活动数据等,为建立高水平的儿童游乐项目设计提供相应的路径,最终为儿童游乐项目设计实施新的思路和方法,提供一定的理论与实践依据。

Beacon技术用于收集读者行为大数据的研究

Beacon是基于位置服务的室内定位技术,可以应用于收集读者行为大数据等图书馆服务中。本文认为读者行为大数据是图书馆的核心数据,图书馆可以用以进行用户细分、为读者提供个性化服务、获得工作参考、进行数字素养教育等方面,研究了利用Beacon技术收集读者行为大数据面临的挑战以及图书馆可以采取的应对措施。

Beacon对蓝牙低功耗(BLE)芯片提出挑战

本文介绍了Beacon的应用场景及蓝牙BLE方案的优势。