Ayman Abdel-Hamid

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At Old Dominion University, we have designed and implemented a Java-based distance education system, which we term IRI-h (for Interactive Remote Instructionheterogeneous). IRI-h is designed to function on a number of heterogeneous platforms, and within heterogeneous network environments. IRI-h builds on the success of its predecessor system IRI, but(More)
The importance of healthcare information technology has increased dramatically during the past few years. Researchers, developers, and companies have placed efforts to develop mobile, web, desktop, and enterprise e-health applications. This development raised the importance of interoperability and data exchange between e-health applications and Health(More)
We present a preliminary framework for interaction interoperability in Distributed Virtual Environments (DVEs). The goal is to allow each user to use a different input devices and interaction techniques and yet collaborate seamlessly. The framework adopts Service Oriented Architecture (SOA) and use a knowledge base in the form of three ontologies. The(More)
−Secure communication in Vehicular Ad hoc Networks (VANETs) can be achieved through a public key infrastructure (PKI). A tamper proof device (TPD) is traditionally used to statically store encryption keys in each vehicle. These keys are renewed periodically by a certificate authority (CA). In this paper, a dynamic key distribution protocol for PKI-based(More)
Web-based collaborative virtual environments can be used for education, design, gaming and for commercial applications. From the users’ perspective, using mobile devices is preferred because of the ability to move freely rather than being tied to a desktop computer. In this paper, we first present the current state of 3D graphics rendering on mobile devices(More)
Mobile IP presents an efficient solution to the wide-area host mobility problem in the Internet. Nevertheless, its home registration process introduces an overhead in the local-area mobility case. A Mobile Host is required to register with its possibly distant Home Agent, whenever it changes its point of attachment to the network. Foreign Agent hierarchies(More)
In recent years, we have seen the introduction and use of many distance learning systems. Some of these systems are characterized as Interactive which means the dominant mode of instruction is live or synchronous using networked multimedia technology such as audio, video and shared workspaces. In this paper, we present the common features and essential(More)
The emergence of XML-based web services as a new software development paradigm increases the expectations of getting better software that address the various collaboration demands over Internet between organizations, or what's termed virtual Organization (VO). The development of appropriate identity management systems between these heterogeneous security(More)
Design-level vulnerabilities are a main source of security risks in software. To improve the reliability of software design, this paper presents a modified threat-driven modeling framework, to determine which threats require mitigation and how to mitigate the threats. To specify the functions and threat mitigations of a security design as a whole,(More)