As networks with mobile devices becorne commonplace, many new applications for those networks arisc, including some that require coordination among groups of mobile clients. One basic tool for implementing coordination ie reliable multicast, where delivery of a multicast message is atomic, i.e. cither all or none of the group members deliver the message. While several multicast protocols have b...

The present study introduced a novel hierarchical hub set covering problem with capacity constraints. This study showed the significance of fixed charge costs for locating facilities, assigning hub links and designing a productivity network. The proposed model employs mixed integer programming to locate facilities and establish links between nodes according to the travel time between an origin-...

In networks where nodes are aware of their locations via the use of a GPS receiver or other localization techniques, geographic routing has been suggested to be the candidate of choice for robust and resource efficient routing. However, efficient location management algorithms are required for the source node to obtain the destination node’s location before it can start data transfer using geog...

Trauma is considered a “modern civilized sickness”, and its occurrence substantially affects all of society, as well as individuals. The implementation of trauma emergency systems in cities with young, prosperous, and highly mobile populations is necessary and significant. A complete trauma emergency system includes both low-level trauma centers that offer basic emergency services and high-leve...

0360-8352/$ see front matter 2013 Elsevier Ltd. All rights reserved. http://dx.doi.org/10.1016/j.cie.2013.12.005 ⇑ Corresponding author. Tel.: 98 (0)21 8752 4022; fax: +98 (0)21 8851 2596. E-mail addresses: [email protected], [email protected] (R.Z. Farahani), [email protected] (M. Hekmatfar). 1 Tel.: +44 (0)20 8417 5098; fax: +44 (0)20 8417 7026. Reza Zanjirani F...

Position-based routing protocols take advantage of location information to perform a stateless and efficient routing. To enable position-based routing, a node must be able to discover the location of the messages’ destination node. This task is typically accomplished by a location service. Recently, several location service protocols have been developed for ad hoc networks. In this paper we pro...

In this paper the two-level Hierarchical Covering Location Problem HCLP is considered. A new genetic algorithm for that problem is developed, including specific binary encoding with the new crossover and mutation operators that keep the feasibility of individuals. Modification that resolves the problem of frozen bits in genetic code is proposed and tested. Version of fine-grained tournament [5]...

Imitation is commonly considered as a hierarchical process. The current study explored the reproduction of a multi-task course in deferred imitation. Eighty-five children between 3.5 and 7.5 years old were divided into five groups and instructed to watch a live human adult demonstrator who performed simple successive actions, such as walking, jumping, grasping, carrying objects from one locatio...

This paper presents a new approach to hierarchical clustering of point patterns. Two algorithms for hierarchical locationand densitybased clustering are developed. Each method groups points such that maximum intracluster similarity and intercluster dissimilarity are achieved for point locations or point separations. Performance of the clustering methods is compared with four other methods. The ...

In a large-scale information system, such as a digital library or the world wide web, a set of distributed caches can improve their e ectiveness by cooperating with one another, both in serving each other's requests as well as in deciding what to store. This dissertation explores the potential of such cooperative caching, and provides basic placement algorithms using which the caches can coordi...