Networks of different types are essential infrastructures for society. Networks such as transportation networks and the electric power grid are becoming increasingly large and complex which create special challenges for human operators who must monitor these networks for safe operation. It is important to understand how human operators monitor these networks and the challenges they face in the ...

Modern critical infrastructures such as the power grid are frequently targeted by distributed denial-of-service (DDoS) attacks. Unlike traditional information and communications systems, where the effects of DDoS attacks are mostly limited to the cyber realm, disruptive attacks on critical infrastructure assets can result in the loss of vital services such as transportation and health care. Thi...

This article presents the modeling of a disturbance on a public transportation line. The suggested model must ensure the synthesis, the evaluation and the update of information available in order to facilitate the task of the operator ensuring the monitoring of the network. In order to achieve this goal, we propose a formal modeling of the concept of disturbance. This modeling makes it possible...

This research uses multivariate cointegration analysis to assess the degree . of competition in the U.S. natural gas industry following the move to open access pipeline transportation. The testing methodology allows multiple nodes in the pipeline network to be analyzed simultaneously and is based on recent advances by Johansen (1988, 1991) and Johansen and Juselius (1990) on estimation and hypo...

An effective evaluation of transportation network efficiency/performance is essential to the establishment of sustainable development in any transportation system. Based on a redefinition of transportation network efficiency, a quantitative efficiency evaluation method for transportation network is proposed, which could reflect the effects of network structure, traffic demands, travel choice, a...

Logistic network design is one of the most important strategic decisions in supply chain management that has recently attracted the attention of many researchers. Transportation network design is then one of the most important fields of logistic network. This study is concerned with designing a multi-stage and multi-product logistic network. At first, a mixed integer nonlinear programming model...

This paper examines the effect of the poor road transportation network on crop production in one of the rural agrarian local government of Kwara State, Nigeria. A well-structured interview schedule was conducted to elicit information from 120 crop farmers using a two-stage sampling technique. Findings from the study revealed that the poor road transportation network in their area had led to a r...

An effective evaluation of transportation network efficiency could offer guidance for the optimal control of urban traffic. Based on the introduction and related mathematical analysis of three quantitative evaluation methods for transportation network efficiency, this paper compares the information measured by them, including network structure, traffic demand, travel choice behavior and other f...

In this paper the authors present a methodology to pursue parallel environmental transport computations on computing grids. A Natural Coordinate System (NCS) is introduced to transform the two-dimensional environmental transport problem into a series of onedimensional advection systems coupled with transverse and longitudinal diffusion. Then appropriate numerical methods are deployed to solve t...