We consider a generalized Jackson network with reneging customers in heavy traffic. In particular, each customer joining a particular station may abandon the network if his service does not begin within a station-dependent, exponential amount of time. We establish that in heavy traffic this system can be approximated by a multi-dimensional regulated Ornstein-Uhlenbeck process.

It is accepted that noise pollution has a major impact on health, such as physical, physiological, psychological and performance related effects, all over the world. This study aims to evaluate noise pollution in four urban parks located in Sanandaj City, Iran and to zone it in GIS environment. Sound pressure level (SPL) and maximum sound level (Lmax) were measured at 45 points (each point was ...

This paper focuses on the development and novel application of data mining techniques for convoy analysis of vehicles based on the automatic number plate recognition (ANPR) system. The amount of ANPR data captured daily by traffic cameras in the road networks is very substantial. Data mining techniques are commonly used to extract relevant information and to reduce the amount of data processing...

An approach to lengthening lifetime in sensor networks is balancing energy usage in network nodes. This can be done by selecting appropriate paths for sending data and monitoring the amount of passing traffic. In this paper, we propose an energy aware protocol, LABTE, which uses learning automata in order to find appropriate paths for sending data packets to balance energy usage in nodes. Resul...

The phenomenon of unwanted commercial messages (UCM), including e-mail spam and emerging forms that target other Internet communications facilities, is analyzed from an information-economics perspective. The UCM industry is characterized as a tragedy of the commons. UCM traffic pays off for its senders when it is noticed and consumed by Internet users, and the industry is, therefore, dependent ...

The IEEE 802.11e standard was introduced to overcome the lack of QoS support for the legacy IEEE 802.11 WLANs. It enhances the Media Access Control (MAC) layer operations to incorporate service differentiation. However, there is a need to prevent overloading of wireless channels since the QoS experienced by traffic flows is degraded with heavily loaded channels. An admission control scheme for ...

As we know the population of metropolitan is growing every day. With increasing country population, amount of vehicles is also rising, and this direct enchases traffic of cities which should be manages as early as possible without any loss people. Traffic causes accidents which directly affect an individual life. In the last 10 years the situation has get worse due to quick growth of automobile...

This paper addresses issues related to buffer and bandwidth management for the Expedited Forwarding (EF) traffic class in IP Differentiated Services (DiffServ) networks. We are concerned with edge nodes connecting a number of end-users with premium traffic contracts to the core network and we examine buffer requirements in those nodes. Our results suggest that even in the case of EF traffic cla...

In some modern complex industrial communication systems, a core network with meshed topology is used to connect large amount of heterogeneous local networks and devices. It should be able to support real-time requirements of the related traffic, as many industrial processes are either mission or safe critical. In this paper, the problem of offering hard and soft real-time as well as best effort...