Banner Research
Wikipedia's content is being written by a completely decentralized set of volunteers across the Globe. However, the centralized server architecture does not match the decentralization of content contribution. We investigate how one could hypothetically redesign the entire Wikipedia system architecture to allow volunteers to host the content collaboratively and securely.

Selected publications:

Header Current Projects

Dependable Cloud computing

The Cloud computing project investigates the way to build scalable and consistent Web applications in the Cloud, and to guarantee constant user-perceived performance even though the request workload may vary by several orders of magnitude and the environment conditions may change. We employ techniques such as scalable NoSQL data services and resource provisioning.

Selected publications:

Extreme-scale ad-hoc networks

Wireless sensor networks connect together hundreds to thousands of tiny batery-operated sensor nodes communicating by wireless transmission. They are good examples of spatial distributed systems where a node's physical location determines what it can and cannot do. We study ad-hoc wireless networks that are extreme in their size (up to dozens of thousands of nodes) and their resource constraints (limited energy, feeble ratio and processing power). We use gossip-based protocols to devise creative application-level scenarios and to improve the energy efficiency of the MAC layer.

Selected publications:

XtreemOS

The XtreemOS E.U. project is building an open source Grid Operating System with native support for virtual organizations and capable of running on a wide range of underlying platforms: PCs, clusters, mobile devices, and grids. Our group has been working on core technologies to allow scalable operation of the Grid: the Resource Selection Service implements the fundamental operation that selects a set of resources that are suitable to execute a given operation. Distributed servers implement a network-level service to provide distributed services with location-transparency.

Selected publications:

You may also want to take a look at our previous research projects.