In this paper, The purpose and the goal of the paper are to introduce a framework based on onto Geographical information systems (GIS) to integrate geographic information of Urban areas taking Khartoum State as an example. One of the main characteristics of such a framework is to support the information integration and data exchange between facilities using the base maps to solve the problem of...

Consider a network facility location problem where congestion arises at facilities, and is represented by delay functions that approximate the queueing process. We strive to minimize the sum of customers' transportation and waiting times, and facilities' xed and variable costs. The problem is solved using a column generation technique within a Branch-and-Bound scheme. Numerical results are repo...

As the Internet continues to experience exponential rates of growth, attention is shifting away from mainstream network services such as electronic mail and le transfer to more interactive information services. Current network information systems, whilst extremely successful, run into problems of fragmentation, consistency, scalability, and loss of orientation. The development of \second genera...

This article investigates conditions for increasing active participation in on-line communities. As a case study, we use three generations of facilities designed to promote learning in the area of Educational Modelling Languages. Following a description of early experience with a conventional web site and with a community site offering facilities for collaboration, we describe a pilot implement...

This paper presents an approach to determining the optimal set of maintenance alternatives for a network of infrastructure facilities using genetic algorithms. Optimal maintenance alternatives are those solutions that minimize the life-cycle cost of an infrastructure network while fulfilling reliability and functionality requirements over a given planning horizon. Genetic algorithms are applied...

T paper focuses on designing facility networks in the public sector so as to maximize the number of people benefiting from their services. We develop an analytical framework for the maximal accessibility network design problem that involves determining the optimal number, locations, and capacities of a network of public sector facilities. We assume that the time spent for receiving the service ...

We consider a network design problem which has shortest routing restriction based on the values determined by the installed facilities on each arc. In conventional multicommodity network design problem, a commodity can be routed through any possible path when the capacity is available. But, we consider a problem in which the commodity between two nodes must be routed on a path which has shortes...

Recently, there are increasing numbers of sensors that report data from our physical environment. A sensor network consists of a number of spatially distributed and communicating sensor resources. Sensor networks have provided us with facilities to collect information and track certain phenomena in the physical environment based on the region of interest. W3C(World Wide Web Consortium) semantic...

Hubs are special facilities that serve as switching, transshipment and sorting points in many-to-many distribution systems. The hub location problem is concerned with locating hub facilities and allocating demand nodes to hubs in order to route the traffic between origin–destination pairs. In this paper we classify and survey network hub location models. We also include some recent trends on hu...

There is now increasing interest in active and programmable networking. Increasing amount of research is ongoing on topics ranging from dynamic service and network management, to control plane switch programmability, to active network capsules carrying code in every datagram. This is in addition to the already established trend of added functionality of gateways, proxies and servers in the netw...