车联网：物联网在城市交通网络中的应用

阐述了“物联网”和“车辆网”这两个热门概念的内涵和外延。通过分析两者的发展历程、历史沿革和相互关系,比较它们在实际生活中的应用, 认为车联网可以看作物联网在城市交通网络中的典型应用,展望了车联网在服务与应用方面的美好愿景。以此为基础,讨论了车联网实现的关键技术,并介绍了一个过渡型构建方案。最后,详细讨论了在物联网和车联网领域里国内外学术研究现状。     

智能交通的车联网体系架构及关键技术研究

针对现有车联网系统处理数据效率低、计算框架复杂、安全性差等问题,本研究通过控制平面和数据平面的分离实现逻辑上的集中控制,增强车联网服务系统的计算、通信和存储能力.在车联网系统框架的基础上,本研究构建区块链网络,其具有分布式、防篡改的技术特点,通过处理喇叭、警报器、动物、人群等的声音强度提高智能控制的能力.实验结果表明,...     

基于物联网的智能交通系统应用研究

物联网技术在智能交通的应用能提高智能交通管控水平和信息化服务能力,能为交通信息的管控水平及管理模式的转变提供了强大的科技保障,同时也能降低能耗并改善环境提供先进的技术支撑,会带来巨大的社会效益和经济效益。文章就智能交通体系框架和诱导系统做了简要的介绍和评析,并提出发展智能交通车联网系统。     

基于RFID的智能交通系统

目前,我国智能交通系统还处于摸索阶段,相关单位各自为战,缺乏团队协作,导致无法整合高效的交通系统。外国中高端交通产品不断输入我国,无法掌握核心科技,使得大量交通的智能产品逐渐“国外化”,甚至牵连智能导航工业和智能运输管理工业。为了弱化上述问题,增强我国智能交通国际竞争力,本文提出一种以物联网为基础的智能交通系统体系结构设计。     

视频技术在智能交通系统中的应用

论述了图像信号处理技术在智能交通系统(ITS)中应用的热点和关键问题。针对智能交通管理系统的多个应用实例，如城市交通智能监控、电子警察系统及流量监测和交通诱导系统等，给出了应用视频技术的解决方案，并与传统的交通管理方式作了对比。     

车联网系统架构及关键技术研究

物联网作为战略性新兴产业和战略性新兴技术,正在引领物理世界与信息世界的重大变革。车联网作为物联网的典型应用,也正在智能交通系统领域发挥着举足轻重的作用。本文从基本概念入手,分析了车联网与物联网的关系,介绍了车联网的系统架以及其中的关键技术,最后展望了车联网的未来。     

车联网通用应用平台研究及其典型应用分析

车联网作为物联网技术的重要应用之一,具有十分广阔的应用前景。文章通过介绍基于位置的车联网通用应用平台概念,分析了车联网通用应用平台的技术构架,并列举了该平台在几个重点领域的典型应用,给出了该平台所具有的通用性与相对于目前车联网技术的优越性。     

物联网技术在智能交通中的应用研究

通过介绍美国发展智能交通系统的成功案例,并联系物联网技术与智能交通领域的融合趋势,搭建起物联网发展背景下的智能交通模型系统,以详细应用为实例,对各个系统的功能和特点,以及相关的智能交通模型的关键技术和实现途径加以分析和阐述.     

计算机技术在智能交通系统中的应用探究

随着我国科学技术的发展,计算机技术在智能交通中的应用也逐渐得到认可.可以说计算机技术不仅仅智能交通系统的核心,更是智能交通系统不断发展的源动力.本文就此展开了讨论,详细分析了计算机技术在智能交通系统中的应用.     

车联网技术的研究

该文通过介绍车联网的基本概念,对车联网的体系结构进行了分析探讨。研究分析了车联网技术发展中存在的关键技术主要有智能交通技术、RFID技术、车联网协议研究、传感器技术,并对车联网能够提供的应用服务进行了归纳总结。     

物联网及其应用剖析

物联网被称为是继计算机和互联网之后的第三次信息技术革命,物联网应用无处不在。提出了物联网的技术层次结构和关键技术,描绘了物联网的应用愿景,认为形成行业标准是我国发展物联网的重要举措。     

物联网及其军事应用

介绍了物联网的内涵、发展及用途,并以图的形式形象地比较了物联网与其他网络的关系。以美军为例,阐述了物联网给军事应用所带来的变革,即实现战场感知的实时化、精确化,武器装备智能化、网络化,综合保障灵敏化、可视化,网络战由虚拟步入现实。同时,简要介绍了美军正在开发的两个物联网军事应用系统,最后提出了对我军应用物联网技术的建议。     

A chaotic framework and its application in image encryption

A novel image encryption framework is proposed in this article. A new chaotic map and a pseudorandom bit generator are proposed. Apart from this, a novel image encryption system is designed based on the proposed map and the proposed pseudorandom bit generator. These three are the major contributions of this work that makes a complete cryptosystem. The proposed new chaotic map is proposed which will be known as the ‘RCM map’ and its chaotic property is studied based on Devaney’s theory. The proposed pseudorandom bit generator is tested using the NIST test suite. The proposed method is simple to implement and does not involve any highly complex operations. Moreover, the proposed method is completely lossless, and therefore cent percent of data can be recovered from the encrypted image. The decryption process is also simple to implement i.e. just reverse of the encryption procedure. A scrambling algorithm is also proposed to further enhance the security of the overall system. The simulation, detailed analysis, and comparative studies of the proposed overall image encryption framework will help to understand the strengths and weaknesses of it. The experimental results are very promising and show the prospects of chaos theory and its usage in the field of data security.

     

Packet-level traffic control for the Internet: a framework and its experimental validation

This paper presents a theoretical framework, which can be the basis for traffic control and resource management mechanisms, that provide QoS with quantitative guarantees in the Internet. The starting point is a fairly general traffic shaping algorithm for effective rate enforcement which is based on a packet spacing law. Multiplexing several independent shaped streams results in a tight upper bound to the queue-length distribution at the multiplexer. The algorithm effectively works with any kind of input traffic (non-stationary, non-Markovian, heterogeneous, long-range dependent (LRD), etc.). Based on the definition of shaped streams, we devise mechanisms for aggregating, splitting and policing such streams without affecting the queuing performance at subsequent network nodes. Also, a calculus for end-to-end QoS in this framework is presented. The theoretical statements are supported by simulation and experimental results on a network testbed. Since the enforced effective rate features the convenient additivity property , it can be handily used for many traffic control and accounting functions, like policing, admission control, bandwidth allocation and charging.     

A design framework for overlapping controllers and its industrial application

This paper presents a new practical framework for output feedback control design with overlapping information structure constraints. In comparison to the earlier work, the proposed method removes some restrictions in the control design algorithm by utilizing congruence transformations, simplifications, and the reciprocal variant of the projection lemma. This leads to a less conservative solution than previous design methods because the choice of some design parameters by trial and error is eliminated. Moreover, in some cases the structural constraint of having a diagonal Lyapunov function in linear matrix inequalities (LMIs) is removed. The results are extended to capture a more general scenario of output feedback control design for nonlinear interconnected systems. The validity of the proposed approach is demonstrated through applications to an industrial utility boiler and to a multi-area power system. Simulation experiments using a nonlinear simulation package of utility boilers called SYNSIM reveal that the proposed design strategy overcomes control problems in the present plant and maintains stability in the presence of sudden load variations. Furthermore, the performance of the overlapping controllers is found to be better than existing PI controllers in the plant.     

提升图嵌入框架及在表情识别中的应用 *

提出了一种提升图嵌入框架用于特征提取和选择 ,以及一种新的近邻权重计算方法 ,称为分类图。传统图嵌入模型的近邻权重采用欧氏距离 ,不能被提升算法所更新 ;相比较 ,分类图采用的是提升算法中样本的权重,反映的是样本在分类过程中的重要程度 ,有效地提高了图嵌入模型的分类性能。在通用人脸表情库上的识别实验结果验证了提升图嵌入模型的有效性。     

Oracle网络目录及其安全分析

介绍了Oracle网络目录的基本概念,阐述了Oracle网络目录的体系结构及其工作过程,对Oracle网络目录的安全策略进行了研究探讨。     

A generic framework of user attention model and its application in video summarization

Due to the information redundancy of video, automatically extracting essential video content is one of key techniques for accessing and managing large video library. In this paper, we present a generic framework of a user attention model, which estimates the attentions viewers may pay to video contents. As human attention is an effective and efficient mechanism for information prioritizing and filtering, user attention model provides an effective approach to video indexing based on importance ranking. In particular, we define viewer attention through multiple sensory perceptions, i.e. visual and aural stimulus as well as partly semantic understanding. Also, a set of modeling methods for visual and aural attentions are proposed. As one of important applications of user attention model, a feasible solution of video summarization, without fully semantic understanding of video content as well as complex heuristic rules, is implemented to demonstrate the effectiveness, robustness, and generality of the user attention model. The promising results from the user study on video summarization indicate that the user attention model is an alternative way to video understanding.     

一种嵌入式网络协议栈框架的研究与应用

提出了一种嵌入式网络协议栈框架。其中,系统抽象层用于提高协议栈的可移植性;连接层用于实现协议栈的多连接管理及其访问控制管理;通信接口层改进了目前嵌入式协议栈与网络应用程序的交互方式;而Socket Lib用于兼容BSD socket API,使网络应用程序可以直接应用于该嵌入式协议栈框架中。     

Content-centric framework for Internet of Things

The Internet of Things (IoT) concentrates on content dissemination and retrieval, so it is significant to achieve efficient content delivery. However, the Internet focuses on end-to-end communications, which might degrade the content retrieval performance in mobile environments. By contrast, the content-centric mechanism might be an ideal method for achieving efficient content delivery although it suffers from flooding and reverse-path disruptions. Therefore, we are motivated to exploit the content-centric mechanism to achieve IoT-based content delivery, and employ the address-centric anycast to overcome the limitations of the content-centric mechanism. Inspired by the idea, we propose a content-centric framework for IoT. The experimental results show that the proposed framework reduces the content communication cost and improves the content acquisition success rate.