A reaction-diffusion model for a temporally variable and spatially heterogeneous environment is developed to mathematically describe the spatial dynamics of water hyacinth and the interacting populations of the various life stages of the Neochetina eichhorniae weevil as a biological control agent on a bounded two-dimensional spatial domain. Difficulties encountered during the implementation of ...

We propose fast heuristics for large-scale covering-location problems in which the set of demand points is discrete and the set of potential location sites is continuous. These heuristics are compared on a set of 152 real-life instances arising in cytological screening. 2002 Elsevier Science Ltd. All rights reserved.

This paper is an attempt to chronicle and evaluate the struggle to innovate, to understand and to produce a sustainable response to the pressing problems of the care and protection of an aging population. In that struggle, quite distinct world views of the lived experience of the older person and their families and carers, the pressures and challenges of practitioners, on managers and planners ...

The overall aim of this paper is to introduce the Private grid environment (PvGrid) as a ubiquitous grid environment that is not only owned and utilized by personal users but also deployed over their own devices. In this paper, architectural designs and simulation models for PvGrids are developed and evaluated. The results indicate the potential of PvGrids as ubiquitous grid environments for pe...

Humans are social animals, they interact with different communities to conduct different activities. The literature has shown that human mobility is constrained by their social relations. In this work, we investigate the social impact on a user’s mobility from his communities in order to conduct location prediction effectively. Through analysis of a real-life dataset, we demonstrate that (1) a ...

The earned value technique is a crucial technique in analyzing and controlling the performance of a project which allows a more accurate measurement of both the performance and the progress of a project. This paper presents a new fuzzy-based earned value model with the advantage of developing and analyzing the earned value indices, and the time and the cost estimates at completion under uncerta...

Looking at different examples of real life “communities”, one can roughly distinguish communities formed by people who are interested in the same topic and communities of people that share some kind of common environment. The first kind of communities can be called “communities of interest”. Examples for such communities are experts in a particular domain or collectors. Examples for communities...

Nowadays, in our society statistics knowledge is really important. The purpose of this paper is to reflect about the need to join teaching-learning of statistics with real life. To justify this fact, we will analyze the standard errors done by our students of the Teacher Training Faculty, and we will show how far has been the academic life of our students to the real life, where until now, stat...

The work of first responders is marked by unpredictable situations, quick decisions and peak performance. Gathering all important information related to an emergency situation forms the basis for a meaningful and purposeful planning and action. For example during an accident scene the execution of complex individual orders is crucial. The many rescue facilities, rescue vehicles, and first respo...