Cognitive radio paradigm has been revealed as a new communication technology that shares channels in wireless networks. Channel assignment is a crucial issue in the field of cognitive wireless networks because of the spectrum scarcity. In this work, we have evaluated the performance of TDMA medium access control protocol. In our simulation scenarios, primary users and secondary users utilize TD...

We study the online problem of assigning a moving point to a base-station region that contains it. For instance, the moving object could represent a cellular phone and the base station could represent the coverage zones of cell towers. Our goal is to minimize the number of handovers that occur when the point moves outside its assigned region and must be assigned to a new one. We study this prob...

In a complex manufacturing environment, such as a semiconductor wafer fab, small variations of system operating factors, implemented at any production step, may have a significant impact on the overall fab performance. Cycle time (CT) reductions obtained at critical tools could generate considerable productivity improvements which eventually lead to a capacity increase at no investment cost. In...

Background. Consider a cellular network consisting of a set of base stations, where the signal from a given base station can be received by clients within a certain distance from the base station. In general, these regions will overlap. For a client, this may lead to interference of the signals. Thus one would like to assign frequencies to the base stations such that for any client within reach...

1 This dissertation presents a vehicle reidentification algorithm for consecutive detector stations on a freeway, whereby a vehicle measurement made at a downstream detector station is matched with the vehicle's corresponding measurement at an upstream station. The algorithm should improve freeway surveillance by measuring the actual vehicle travel times; these are simply the differences in the...

This paper reports the error analysis results for the gridded daily precipitation data over the state of Texas of the United States from January 1, 1901 to December 31, 2000. The Global Daily Climatology Network dataset is used for both the data gridding and error analysis. The station data have been interpolated onto a 0.2° × 0.2° grid which starts at the base point (25°50′N, 106°38′W). The da...

A mobile device connects to the cell tower (base station) from which it receives the strongest signal. As the device moves it may connect to a series of towers. The process in which the device changes the base station it is connected to is called handover. A cell tower is connected to a radio network controller (RNC) which controls many of its operations, including handover. Each cell tower han...

We consider optimization of the multi-robot task-allocation (MRTA) problem when the overall performance of the team need not be a standard sum-of-utilities (or costs) model. We introduce a generalization which allows for the additional cost incurred by resource contention to be treated in a straightforward manner. In this variant, robots may have multiple ways to perform a task (e.g., several r...

A theory is provided for the problem of passenger waiting and route choice at a transit station where a set of lines serviced by vehicles of limited capacity are available to reach a given destination. It is assumed that the platform layout involves one boarding zone only. The theory addresses waiting discipline – either priority queuing or mingled waiting – and choice behaviour – either selfis...

This paper addresses the mobile assignment problem in a multi-cell broadcast transmission seeking minimal total power consumption by considering both transmission and operational powers. While the large scale nature of the problem entails to find distributed solutions, game theory appears to be a natural tool. We propose a novel distributed algorithm based on group formation games, called the h...