The issue of using the Sporadic Server (SS) for scheduling aperiodic tasks has received new attention under the POSIX standard as it has been proposed in P1003.1d, the additional real-time extensions to POSIX. The SS has been traditionally considered a better approach to the deferrable server (DS) due to its supposed higher achievable utilisation. However, SS also has higher implementation comp...

Anytime, anywhere and anyhow access to personalized services requires the complete decoupling of devices for accessing the service and the supporting personal data storage. When deploying such transparent personalized services, an important question that needs answering is where to install the storage servers. In this respect, this paper considers the deployment of a personal content storage se...

Theoretical research on networks and technology standards suggests that network externalities, the additional value of a product or service resulting from an existing installed base, have strategic implications. This paper uses the WWW software market to empirically test the network externalities hypothesis in a market of composite goods. Among the findings is that vendors who provide both comp...

Due to its low cost, robustness, flexibility and ubiquitous nature, cloud computing is changing the way entities manage their data. However, various privacy concerns arise whenever potentially sensitive data is outsourced to the cloud. This paper presents a novel approach for coping with such privacy concerns. The proposed scheme prevents the cloud server from learning any possibly sensitive pl...

Abstract: This paper examines the steady state behavior of an M/G/1 queue with repeated attempts in which the server may provide an additional second phase of service. This model generalizes both the classical M/G/1 retrial queue and the M/G/1 queue with classical waiting line and second optional service. We carry out an extensive stationary analysis of the system, including existence of statio...

This thesis discusses the design and implementation of a framework for constructing user-level modular filesystems. This framework facilitates incremental extension of previous systems as well as the code reuse and sharing between systems. Unlike previous works, this work focuses primarily on file servers rather clients, although it can be used for both. The framework described here provides a ...

This paper is focused on an emerging technology for e-Learning and e-Science communities -a 64-bit .NET e-portal application, and its functionality, development and technical implementation are described. Currently, additional troubleshooting is required to make .NET Framework 1.1 working in stable ways on 64-bit Windows operating systems. After stabilizing .NET environment, the next step is th...

A novel system providing e ective and e cient access to video archives for mobile users communicating over low bandwidth error-prone wireless links is proposed. The developed system has three components: First, the middleware, implemented as mobile proxy server located at the mobile support station, is chosen for the seamless integration of both mobile users and video servers by hiding the spec...

Network-attached storage devices provide ways to build large scalable file systems that distribute data and load across multiple network nodes. Even though data is distributed, most file systems require a shared server to manage centralized data for clients. This paper investigates ways to use a scheduler to support latency guarantees for requests to a centralized data server. We develop a simp...

Errors such as deadlock and race conditions are very common yet extremely difficult to debug in the communications design of client/server models based on remote procedure call and multi-threading. This paper presents an effective approach to detect these errors. It shows how to apply the specification and validation techniques in Protocol Engineering to discover those errors in the early stage...