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We present stochastic vehicle routing policies for detection of any number of anomalies in a set of regions of interest. The autonomous vehicle collects information from a set of regions and sends it to a fusion center. The vehicle follows a randomized region selection policy at each iteration. Using the collected information, the fusion center runs an ensemble of cumulative sum (CUSUM) algorithms...
Material handling systems are usually modeled as discrete event systems. However, when the size of these systems grows, the overall system performances depend also on continuous time phenomena. We present a hybrid model based on a new Petri net formalism that merges the concepts of Hybrid Petri Nets and Colored Petri Nets to obtain compact models for these systems. An example is discussed in detail...
Although Vehicular Ad-hoc Network (VANET) is a subclass of Mobile Ad-hoc Network (MANET), some routing protocols designed for MANET, such as AODV, are no longer suitable in VANET due to the high mobility of VANET. For this reason, we propose a GPS based AODV (GBAODV) in this paper. With the support of the GPS device, we constrain the number of AODV routing packets flooding in the network and establish...
This work presents a stochastic dynamic programming (SDP) algorithm that aims at minimizing an economic criteria based on the total energy consumption of a range extender electric vehicle (REEV). This algorithm integrates information from the REEV's navigation system in order to obtain some information about future expected vehicle speed. The model of the vehicle's energetic system, which consists...
In this paper a network of vehicles moving in a two dimensional plane, described by double integrator dynamics, is stabilized by a novel distributed control methodology, to maintain a formation. The distributed control architecture employs static output feedback using an artificial delay. Delays in communication of the relative information are exploited to stabilize the network system using state...
We present a decentralized, real-time, cooperative avoidance control law for a group of nonlinear Lagrangian systems with bounded control inputs, limited sensing ranges, and bounded sensing errors. The control formulation builds on the concept of avoidance control and uses Lyapunov-based analysis to guarantee collision-free trajectories for a group of N vehicles with sensing uncertainties. Advantages...
The present work proposes a communication system to ensure Internet connectivity and network transparency to a group of nodes within a vehicle in the heterogeneous wireless networks environment. It organizes routers and hosts located inside a vehicle into a mobile network. Each vehicle is equipped with multiple cares of addresses corresponding to multiple network interfaces. The proposed scheme provides...
An adaptive MAC retransmission limit selection scheme is proposed to improve the performance of IEEE 802.11p MAC protocol for video streaming applications over vehicular area networks (VANETs). A multi-objective optimization framework is applied at road side unit (RSU) which jointly minimizes the probability of playback freezes and the start-up delay of the streamed video at the destination vehicle...
Intersection collision warning system has been widely studied with the progress in wireless communication technology and positioning devices, which are now increasingly available on smart phones. In this paper, we present an Intersection Collision Warning (ICW) system using Wi-Fi smart phones with built-in GPS receivers for vehicular ad-hoc networks. In the system, smart phones first retrieve safety-related...
In a vehicular ad hoc network, vehicles can communicate with their correspondent nodes through the Internet using various wireless technologies. This kind of wireless networks brings a lot of new applications to metropolitan networks, such as online games, VoIP, etc. However, compared with traditional wireless networks, the high speed of vehicles and the limited transmission range of antennas introduce...
The use of vehicular infrastructure to establish connectivity between isolated stationary Information Relay Sta- tions is an appealing application of Terrestrial Delay-Tolerant Networking. A source opportunistically releases data bundles to vehicles that randomly enter its range. In turn, those vehicles store the received bundles, carry and deliver them to their intended destination. It follows that...
This paper proposes a Markov model for analyzing the performance of periodic broadcast in vehicular ad hoc networks (VANETs). Since there is no packet retransmission in broadcast, we only consider a one-dimensional Markov model. In the proposed model, we assume that the traffic condition is unsaturated and introduce a state to represent the situation when there is no packet waiting for transmission...
In recent works, a priority-aware deterministic access protocol that is based on 802.11p/DSRC was introduced to allow vehicles to access the shared medium in collision-free periods. The VANET Deterministic Access (VDA) protocol as introduced in [8] has no mechanism that prevents a non VDA-enabled vehicle from accessing the channel in a scheduled VDA opportunity (VDAOP). A non VDA-enabled vehicle,...
In this paper we study the quality of service (QoS) and energy performance of the carrier sense multiple access with collision avoidance (CSMA/CA) based 802.11p scheme, and our previously proposed modified version of packet reservation multiple access (M- PRMA) scheme for a vehicle-to-roadside (V2R) network in a motorway environment. The simulation results illustrate the deficiency of the 802.11p...
The fast moving of nodes will cause the frequent change of network topology which makes the data dissemination of VANET (Vehicular Ad-hoc Networks) challenging. This paper proposes a data dissemination strategy which is called the Adaptive Connectivity Data Dissemination Scheme (ACDDS), that is, the nodes calculate the network connectivity in current areas by the distributed nodes density perception...
This research categorized U-turn at Signalized Intersections into mainly four modes, designating them as Mode A,B,C,D: Mode A, at the Downstream Section of the Stop Line; Mode B, at Upstream Section of the Stop Line; Mode C, at the Right Side of the Ingress; Mode D, at the Upstream Section of the Transition Zone. We first evaluate their respective efficiency level, and then set up an efficiency evaluation...
To improve driving comfort and provide entertainment services, vehicular communication networks (VCNs) have appeared as an emerging solution, which consists of road-side units (RSUs) and on-board units (OBUs) to distribute multimedia contents. However, as most of OBUs always request the stored contents in the RSUs, how to update the contents in these RSUs when the original changes at its original...
In this paper, we propose a delay-tolerant secure long-term health care scheme (Health-Post) to monitor patient's sensitive personal health information (PHI), particularly at the rural areas. To minimize the overall health care cost, Health-Post provides network connectivity to rural areas in developing region using conventional transportation vehicles (e.g., cars, buses) as relay nodes. These vehicles...
The paper focuses on the design of a platoon control system with a diverse vehicle formation. After a brief summary of the vehicle model and the control criteria, the paper demonstrates methods for eliminating the longitudinal oscillations caused by the communication and actuator delays and environmental disturbances. The realization and evaluation are carried out with diverse control strategies....
As more and more vehicles are being introduced into the urban streets every year, congestion has become a serious problem in the context of urban transport around the world. A desirable strategy to deal with such issues is to shift more people from personal vehicles to public transport by providing better service (comfort, convenience and so on). Travel time information is a vital component of many...
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