In this research, we develop a conceptual model to explain the relationship between knowledge infrastructure, knowledge sharing (KS) and innovation capability, using system dynamics approach. This research is important since it will provide better understanding on what infrastructures are critical to support KS activities, and how KS will affect the capability of enterprise to innovate, and how...

In the United States and numerous other parts of the world, road traffic for a critical part of economic activity. Numerous measures are being taken to address problems arising from traffic congestion. An essential step in this direction is the creation of a traffic monitoring system with capabilities to estimate traffic with significant accuracy and reliability. Historically, dedicated infrast...

This article presents an integrated cognitive system for automatic video surveillance: in particular, we focus on the task of classifying the actions occurring in a scene. For this purpose, we developed a semantic infrastructure on top of a hybrid computational ontology of actions. The article outlines the core features of this infrastructure, illustrating how the processing mechanisms of the c...

The present paper presents the Semantic Framework for Content and Solutions, an ontological framework that enables the classification of various assistive technologies (both software and hardware) according to well-known accessibility standards, such as the ISO 9999 standard, and also the description of all the supported adjustments/settings and their alignment with similar settings of other te...

Ubiquitous computing focusing on users and tasks instead of devices and singular applications is an attractive vision for the future. Especially the idea of nomadic, mobile users poses new challenges on hardware and software. Mobile devices provide vastly different presentation capabilities and need to integrate into heterogeneous environments. Network bandwidth is far from being constant and s...

Next generation systems for critical infrastructure protection must support capabilities such as behavior analysis, situation modeling and data mining integrated within sophisticated virtual or augmented reality interfaces. This paper describes the design goals and implementation of a platform for critical infrastructure security applications. The platform is designed to support semi-automated ...

Every organization with more than a few system administrators has policies in place. These policies define who is allowed to change what aspects of the configuration of a computer infrastructure. Althoughmany system configuration tools are available for automating configuration changes in an infrastructure, very little work has been done to enforce the policies dealing with access control and w...

This paper presents experiences from the course of Informatics at the Hellenic Open University. Problems faced and lessons learned are presented relating to the introduction of e-learning capabilities into this course that was initially based on a traditional distance-learning model. The paper discusses the need that imposed the introduction of e-learning infrastructure and procedures into the ...

A public-key infrastructure (PKI) typically requires use of tamper-proof devices that can perform crypto computations and store highly sensitive data like private keys. Smart cards are the low cost devices that satisfy these requirements and, as a result, they can boost the wide deployment of a PKI. Yet certain limitations exist regarding the handling of certificates, one of the supporting mech...

It is amply clear from the recent unfortunate events of September 11, 2001 and the South-Asian tsunami disaster that there exists a strong need for a rapidly deployable communications network that would serve to provide much needed connectivity and communications capabilities to rescue workers and survivors. Disaster sites are often located in geographical areas with little or no infrastructure...