T efficient operation of traffic signal systems with complex phasing has been a constant challenge for the traffic engineer, In recent years, the accelerated and continued growth in traffic demand has produced congestion and a cfecreased Icvel of service unprecedented on many urban and suburban facilities of the country. It is apparent that an optimal traffic control plan must be designed and i...

This paper extends previous work that examines the utility of employing a Generalized Random Adaptive Search Procedure (GRASP) to minimize the impact on the National Airspace while resolving congestion. As today's methods for managing congestion are mostly manual, and for which predictions of both capacity and traffic demand are uncertain, it is often difficult to find efficient, flight-specifi...

We consider link error or physical channel error in wireless networks and propose a new ratebased congestion control scheme for wireless networks, which is based on the NUM framework developed for TCP-like congestion control model in wired networks. This scheme is distributed and can be implemented by changing the number of connections opened by one user and requires no modification to either t...

The IEEE 802.15.4 is a new wireless personal area network standard designed for wireless monitoring and control applications. In this paper a study of the backoff exponent (BE) management in CSMA–CA for 802.15.4 is conducted. The BEs determine the number of backoff periods the device shall wait before accessing the channel. The power consumption requirements make CSMA–CA use fewer Bes which inc...

Performance of Vehicular Adhoc Networks (VANETs) in high node density situation has long been a major field of studies. Particular attention has been paid to the frequent exchange of Cooperative Awareness Messages (CAMs) on which many road safety applications rely. In the present paper, se focus on the European Telecommunications Standard Institute (ETSI) Decentralized Congestion Control (DCC) ...

A decentralized algorithm is presented that enables the different rate-adaptive receivers in different multicast sessions to adjust their rates to satisfy some fairness criterion. The problem of congestion control in networks, which supports both multirate multicast sessions and unicast sessions. A one-bit Explicit Congestion Notification (ECN) marking strategy to be used at the nodes is also p...

the method for measuring the congestion of noura et al. [a.a. noura, f. ‎hosseinzadeh lotfi, g.r. jahanshahloo, s. ‎fanati rashidi, r.p. barnett, a new method for measuring congestion in data envelopment analysis, socio-economic planning sciences, 44 (2010) 240-246] ,there is no problem for congestion detection in the case of one input and one output but in higher space is not able to detect co...

STUDY OBJECTIVE Although chest radiography is quick and inexpensive, previous research suggests that it is often misleading in emergency department (ED) patients with decompensated heart failure, resulting in misdiagnosis and inappropriate treatment. This study determines the rate of negative chest radiography results in patients found to have disease and the potential contribution of negative ...

We present a method to automatically collect data about distance and speed of vehicles ahead of a car participating in highway traffic. The method should support the registration of traffic in front of a driving car over long periods of time in order to be able to detect over-persistent congestion (OPC) situations. The method requires no specialized devices; it is based on a simple video stream...

This paper considers the welfare impacts of a range of franchising regimes for congestible highways. For a single road in isolation, it is shown that a competitive auction with the level of road use as the decision criterion produces the socially optimal road (in terms of capacity and toll level) as the equilibrium outcome, provided constant returns to scale characterize highway operations. The...