Abstract. Given the demand between each origin-destination pair on a network, the planar hub location problem is to locate the multiple hubs anywhere on the plane and to assign the traffic to them so as to minimize the total travelling cost. The trips between any two points can be nonstop (no hubs used) or started by visiting any of the hubs. The travel cost between hubs is discounted with a fa...

The large-scale structural ingredients of the brain and neural connectomes have been identified in recent years. These are, similar to the features found in many other real networks: the arrangement of brain regions into modules and the presence of highly connected regions (hubs) forming rich-clubs. Here, we examine how modules and hubs shape the collective dynamics on networks and we find that...

Objective, early, and non-invasive assessment of brain function in high-risk newborns is critical to initiate timely interventions and to minimize long-term neurodevelopmental disabilities. A prerequisite to identifying deviations from normal, however, is the availability of baseline measures of brain function derived from healthy, full-term newborns. Recent advances in functional MRI combined ...

The notions of subgraph centrality and communicability, based on the exponential of the adjacency matrix of the underlying graph, have been effectively used in the analysis of undirected networks. In this paper we propose an extension of these measures to directed networks, and we apply them to the problem of ranking hubs and authorities. The extension is achieved by bipartization, i.e., the di...

Brain network hubs are susceptible to normal aging processes and disruptions of their functional connectivity are detrimental to decline in cognitive functions in older adults. However, it remains unclear how the functional connectivity of network hubs cope with cognitive heterogeneity in an aging population. This study utilized cognitive and resting-state functional magnetic resonance imaging ...

One aspect of opinion change that has been of academic interest is the impact of people with extreme opinions (extremists) on opinion dynamics. Amblard and Deffuant (2004) used an agent-based model to study the role of small-world social network topologies on general opinion change in the presence of extremists. They found that opinion convergence to a single extreme occurs only when the averag...

Wireless ad hoc networks are defenceless to uniqueness based assaults because they don’t have the centralized server to control the communication nodes in the network, so many attacks like injecting the malicious nodes by adversaries, false identity creation for nodes and also including spoofing attacks, such that drastically collision or reduce the overall routine of wireless networks. Conserv...

PUNCH, the Purdue University Network Computing Hubs, is an infrastructure for network-based VLSI CAD and TCAD that allows users to access and run existing software tools via standard world-wide web browsers. Tools do not have to be written in any particular language, and access to source-code is not required. The PUNCH infrastructure is geographically distributed, but this is transparent to use...