Advances in vehicular ad-hoc networks (VANETs): Challenges and road-map for future development

Recent advances in wireless communication technologies and auto-mobile industry have triggered a significant research interest in the field of vehicular ad-hoc networks (VANETs) over the past few years. A vehicular network consists of vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) communications supported by wireless access technologies such as IEEE 802.11p. This innovation in wireless communication has been envisaged to improve road safety and motor traffic efficiency in near future through the development of intelligent transportation system (ITS). Hence, governments, auto-mobile industries and academia are heavily partnering through several ongoing research projects to establish standards for VANETs. The typical set of VANET application areas, such as vehicle collision warning and traffic information dissemination have made VANET an interesting field of mobile wireless communication. This paper provides an overview on current research state, challenges, potentials of VANETs as well as the ways forward to achieving the long awaited ITS.     

Parity-relation-based state-of-health monitoring of lead acid batteries for automotive applications

Effective vehicular power management requires accurate knowledge of battery state, including state-of-charge (SOC) and state-of-health (SOH). This paper presents an integrated algorithm for reliable battery SOH monitoring. The dynamics of lead acid batteries during engine cranking is investigated, and a new battery model is presented. Moreover, a parity-relation-based integrated method for battery SOH monitoring is proposed. It is shown that the diagnostic residual combines the SOH information provided by both battery resistance and voltage loss during engine cranking, hence enhancing diagnostic performance. Extensive evaluation results using real vehicle cranking data have verified the effectiveness of the proposed method.     

Traffic congestion detection in large-scale scenarios using vehicle-to-vehicle communications

Cooperative vehicular systems are currently being investigated to design innovative ITS (Intelligent Transportation Systems) solutions for road traffic management and safety. Through the wireless exchange of information between vehicles, and between vehicles and infrastructure nodes, cooperative systems can support novel decentralized strategies for ubiquitous and more cost-attractive traffic monitoring. In this context, this paper presents and evaluates CoTEC (COperative Traffic congestion detECtion), a novel cooperative technique based on Vehicle-to-Vehicle (V2V) communications designed to detect road traffic congestion. CoTEC is evaluated under large-scale highway scenarios using iTETRIS, a unique open source simulation platform created to investigate the impact of cooperative vehicular systems. The obtained results demonstrate CoTEC's capability to accurately detect and characterize road traffic congestion conditions under different traffic scenarios and V2V penetration rates. In particular, CoTEC results in congestion detection probabilities higher than 90%. These results are obtained without overloading the cooperative communications channel. In fact, CoTEC reduces the communications overhead needed to detect road traffic congestions compared to related techniques by 88%.     

Multiple hypothesis tracking for data association in vehicular networks

The introduction of Vehicle to Vehicle (V2V) and Vehicle to Infrastructure (V2I) communications in Intelligent Transportation Systems of the future brings new opportunities and new challenges into the automotive scene. Vehicular communications broaden the information spectrum that is available to each vehicle, allowing the enhancement of existing applications and the introduction of new ones. Undoubtedly, the impact of this new technology in transportation safety, efficiency and infotainment is expected to be very important.A significant part of research in vehicular networks (VANETs) is dedicated to networking issues like routing and safety. However, perception systems which until now were based on onboard sensors only, need to incorporate the wirelessly received information in order to extend the situation awareness of the vehicle and the driver. This paper presents an algorithm for associating targets tracked from an onboard radar sensor with the position and motion data received from the VANET. The core of the algorithm is a track oriented multiple hypothesis tracker that is modified for incorporating information included in VANET messages. The algorithm is tested in real scenarios using two experimental vehicles and then compared with two other algorithmic approaches. One is using a simpler single hypothesis algorithm for association of VANET messages and the second is using only the onboard sensors for environment perception. As a result, the advantages of the Multiple Hypothesis Algorithm regarding association performance and the added value of wireless information in the perception system are highlighted.     

Adaptive green traffic signal controlling using vehicular communication

The importance of using adaptive traffic signal control for figuring out the unpredictable traffic congestion in today’s metropolitan life cannot be overemphasized. The vehicular ad hoc network (VANET), as an integral component of intelligent transportation systems (ITSs), is a new potent technology that has recently gained the attention of academics to replace traditional instruments for providing information for adaptive traffic signal controlling systems (TSCSs). Meanwhile, the suggestions of VANET-based TSCS approaches have some weaknesses: (1) imperfect compatibility of signal timing algorithms with the obtained VANET-based data types, and (2) inefficient process of gathering and transmitting vehicle density information from the perspective of network quality of service (QoS). This paper proposes an approach that reduces the aforementioned problems and improves the performance of TSCS by decreasing the vehicle waiting time, and subsequently their pollutant emissions at intersections. To achieve these goals, a combination of vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) communications is used. The V2V communication scheme incorporates the procedure of density calculation of vehicles in clusters, and V2I communication is employed to transfer the computed density information and prioritized movements information to the road side traffic controller. The main traffic input for applying traffic assessment in this approach is the queue length of vehicle clusters at the intersections. The proposed approach is compared with one of the popular VANET-based related approaches called MC-DRIVE in addition to the traditional simple adaptive TSCS that uses the Webster method. The evaluation results show the superiority of the proposed approach based on both traffic and network QoS criteria.     

企业内部供应链信息流集成 --上海精艺纺织制品加工厂集成化信息系统的建立

提出了以Intranet为基础 ,针对企业的实际现状 ,为企业进行管理咨询 ,选择适合企业的经营管理模式 ,并将其融入系统中 ,建立企业的集成化信息系统的设想。并以上海精艺纺织制品厂为实例 ,介绍了基于B/S架构的企业集成化信息系统的整体框架     

An intelligent infotainment dissemination scheme for heterogeneous vehicular networks

In a vehicular network, applications are expected to be aware of network conditions and be adaptable to the varying environment in order to achieve the acceptable and predictable performance. Moreover, the establishment of vehicle infotainment system in a heterogeneous vehicular network needs to pay special attention to the distinctive network characteristic in wired/wireless networks, such as dynamic topology and less available bandwidth, and the exploitation of the underutilized peers’ resources to support large-scale services. This work thus proposes a service-oriented information dissemination scheme for vehicle infotainment system to ensure the possibility of heterogeneous vehicular communication and a framework for delivering real-time services over an IP-based network is provided to assure interoperability, roaming, and end-to-end session management. The main focus of this work is to implement an adaptive vehicle infotainment system, in which cache relay nodes ((Xiao, Zhuang, & Liu, 2005)) can be intelligently determined. Fuzzy logic inference system is employed to determine appropriate cache relay nodes to cache infotainment data streams and distribute them to different peers through service-oriented architecture. The experimental results demonstrate that effectiveness and practicability of the proposed work.     

Guest Editorial on Vehicular Networking Protocols

Vehicular communications is receiving an increased interest by the research community both from industry and academia. These technologies known as Vehicular Ad hoc Networks (VANET) include vehicle-to-infrastructure (V2I), and vehicle-to-vehicle (V2V) communications and can be based on various communications technologies. This special issue on Vehicular Networking Protocols technologies highlights new trends on networking protocols and their issues, further focusing on the Medium Access Control (MAC) layer and Physical (PHY) layer challenges. It also underlines on algorithms and protocols for data aggregation and group-based networking in vehicular networks.     

GPRS与GPS在汽车信息服务系统中的设计应用

本文分析了基于嵌入式处理器(Intel SitSang)的汽车信息服务系统。该系统由ARM9嵌入式处理器模块、GPRS模块、GPS模块、汽车安防信息采集和内部故障检测模块、LCD显示模块以及中心台等部分组成。重点介绍了GPRS模块和GPS模块的嵌入式开发．以及如何应用这两个模块实现短信息收发、定位信息的采集和电子地图显示、定位信息和汽车状态故障信息的传输、用户和控制中心台实时的交互、Internet的实时接入与通信等系统功能，实现了一种智能交通系统的可行方案。     

Android/OSGi-based vehicular network management system

With the enormous market potential of the telematics industry and the rapid development of information technology, automotive telematics has attracted considerable attention for mobile computing and Intelligent Transport Systems (ITSs). However, as a result of varied platform standards, not all telematics services can be used in telematics terminals. The main issues are that most telematics technologies depend on vertical, proprietary, and closed Original Equipment Manufacturer (OEM) platforms. These platforms form islands of non-interoperable technology and prevent third-party service providers from creating valuable services. This study integrates the Open Gateway Service Initiative Vehicle Expert Group (OSGi/VEG) into an Android platform to generate a vehicular Android/OSGi platform that has the advantages of both original platforms. These features include remote management, rich class-sharing, proprietary vehicular applications, security policies, easy management of Application Programming Interface (APIs), and an open environment. This study also integrates a cloud computing mechanism into the Android/OSGi platform, allowing service providers to upload their telematics bundles onto storage clouds using a provisioning server. A management agent in the Android/OSGi platform can simultaneously update its application service modules using remote storage clouds and use visual intelligence to continually change the distinguishing features of applications based on context-awareness without user intervention. To assess the feasibility of the proposed Android/OSGi platform, this study presents a vehicular testbed to determine the functionalities of different telematics applications. Android/OSGi platform applications require less memory and system resources than those on the original Android platform when performing complicated operations. Additionally, the Android/OSGi platform launches telematics services more quickly than the original Android platform. The proposed platform overcomes the problem of frequent non-responsive exceptions in the original Android platform.     

分布式环境下的智能信息集成管理模型及实现

论述了分布式计算环境中的智能信息集成管理模型的原理，地位、作用、功能及其在Ｃｌｉｅｎｔ／Ｓｅｒｖｅｒ环境听实现结构。此外，还讨论了在分布式计算的制造企业环境中，基于智能信息集成管理模型的智能计算机集成系统的结构。     

A case study of an inter-enterprise workflow-supported supply chain management system

Doing business over the Internet is cheap and convenient. This enlarges the view of enterprises and gives them an opportunity to select their partners. To support business-to-business operations, an information system (IS) with an embedded workflow management component is needed. The inherent characteristics of such a system makes it suitable to implement cross-organization management. Nowadays, however, these system additions are not common. When developing a supply chain management (SCM) system for a large motorcycle corporation in China, we had to construct an inter-enterprise architecture using the internet. The main part of this is a workflow-supported inner supply chain system and an integrated interface. In it, the business processes are defined and executed by the supply chain management system. The independent inner systems are connected by the integrated interface into a large, global, supply chain manage system to management business processes across the independent enterprises. This paper presents the system design and implementation and discusses our experiences and lessons learned.     

基于GSM的高速公路管理系统

高速公路管理系统是基于GSM的综合软件管理平台,能将高速公路各个站点的突发警报进行实时显示、记录。本系统以STC12C5A32S2作为系统核心处理器,控制GSM模块进行信息的收发,并把通过STC12C5A32S2读取的GSM模块上存储的信息上传到计算机进行处理、显示及记录。     

综合网络管理系统信息模型的设计

通过对一个综合性通信网的分析和研究,设计了一种实用的基于TMN标准的综合通信网管信息模型,并给出若干实际应用的范例。最后论述了应用范围和局限性。     

渤海造船厂计算机集成制造系统(BS-CIMS)

简介了渤海造船厂计算机集成制造系统（ＢＳ－ＣＩＭＳ）的系统结构,系统组成（工程设计、经营管理、财务管理、生产管理、建造作业和质量管理６个应用分系统）,信息分类编码原则,计算机支撑环境,分系统之间信息界面和系统集成方案．     

纸箱业大规模定制的集成信息管理系统开发

对大规模定制生产的产品设计业务流程及其集成信息管理技术进行了研究,提出一个面向大规模定制生产的集成信息管理系统框架。根据该系统框架以及瓦楞纸箱制造行业企业管理的实际需求,综合运用所研究的大规模定制生产的产品设计技术,构建了面向瓦楞纸箱制造行业大规模定制的集成信息管理系统。     

集成化生产管理系统中的信息处理技术

信息技术的发展对企业中的制造自动化系统提出了信息集成的要求，该文介绍了板材柔性制造系统（FMS）集成化生产管理系统中的信息处理技术，详细论述了数据库设计方法和网络通信技术的具体实现。     

Exploiting hierarchical terrestrial-satellite architectures to handle voice,symmetric data,and asymmetric data connections

This article investigates new techniques for the dimensioning and the effective exploitation of radio resources in integrated terrestrial-cellular and satellite systems. A dynamically configurable radio resource management policy is proposed. Its main feature is the differentiated handling of user mobile calls, based on the type of service (voice, symmetric data, asymmetric data), the nature of the call (originating or handoff call) and the user mobility class (pedestrian or vehicular). The output of the study is particularly useful to support the design of next-generation wireless systems, which are based on a hierarchical cell structure where different cell types (e.g., macrocell and microcell) operate together with an overlapping satellite coverage.     

意美公司信息管理系统设计与实现

对意美公司信息管理系统需求进行了分析,构建以库存管理为核心的采购、入库、销售、出库一体化的信息管理系统。对开发中的关键问题,给出了解决方案,效果良好。     

NCTUns tool for wireless vehicular communication network researches

Several goals such as improving road safety and increasing transport efficiency are being pursued in intelligent transportation systems (ITS). Wireless vehicular communication is one technology to achieve these goals. Conducting vehicular experiments on the roads is an approach to studying the effectiveness of wireless vehicular communication. However, such an approach is costly, hard-to-control (repeat), dangerous, and infeasible when many vehicles and people are involved in the field trial. In contrast, the simulation approach does not have these problems. It is a very useful approach and complements the field trial approach. This paper presents NCTUns, an open source integrated simulation platform, for wireless vehicular communication network researches. This tool tightly integrates network and traffic simulations and provides a fast feedback loop between them. Therefore, a simulated vehicle can quickly change its driving behavior such as moving speed and direction when it receives a message from the wireless vehicular communication network. This capability is required by several novel ITS applications such as active collision avoidance systems. In this paper, we present the design, implementation, validation, and performance of this tool.