Front Cover: Map of the Blackberry Creek watershed in Kane and Kendall Counties, Illinois, and the Fox River watershed in northeastern Illinois (modified from Bartosova et al. 2007). CONTENTS Abstract 1

Perfect simulations or exact sampling are labels for a recently developed set of techniques designed to produce output whose distribution is guaranteed to follow a given probability law. These techniques are particularly useful in relation with Markov Chain Monte Carlo, and their range of applicability is rapidly growing (see Green and Murdoch (1999), Section 1.3, and Mira, Møller and Roberts (...

We study the social choice problem where a group of n voters report their preferences over alternatives and a voting rule is used to select an alternative. We show that when the preferences of voters are positively correlated according to the Kendall-Tau distance, the probability that any scoring rule is not ex post incentive compatible (EPIC) goes to zero exponentially fast with the number of ...

We consider the problem of approximate sorting of a data stream (in one pass) with limited internal storage where the goal is not to rearrange data but to output a permutation that reflects the ordering of the elements of the data stream as closely as possible. Our main objective is to study the relationship between the quality of the sorting and the amount of available storage. To measure qual...

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The modularized code encapsulating object interactions is characterized by class hierarchies. In the implementation of mobile agents, we have observed that the changes in agent interaction protocols lead to uncontrolled subclassing and consequently to disorder. This phenomenon is known as entropy. The additional subclassing, modification to protocols, restructuring of the class hierarchies, cha...

Extreme rainfall frequency analysis for Meteorological Sub-Division 4 of India was analyzed using Lmoments approach. Serial Correlation and Mann Kendall tests were conducted for checking serially independent and stationarity of the observations. The discordancy measure for the sites was conducted to detect the discordant sites. The regional homogeneity was tested by comparing with 500 generated...