Distributed protocols executing in uncertain environments, like the Internet, had better adapt dynamically to environment changes in order to preserve QoS. In a previous work, it was shown that QoS adaptation should be dependable, if correctness of ...

This paper introduces an approach to develop component-based adaptive distributed applications. Our approach separates the communication and the functional aspects of a distributed application and specifies the communication part as an abstract ...

Database replication has been researched as a solution to overcome the problems of performance and availability of distributed systems. Full database replication, based on group communication systems, is an attempt to enhance performance that works well ...

Middleware-based database replication protocols are more portable and flexible than kernel-based protocols, but have coarser-grain information about transaction access data, resulting in reduced concurrency and increased aborts. This paper proposes ...

Distributed systems, services and databases are at the core of the information society and increasingly pervade many aspects of our daily lives. While mobility and pervasiveness require support for systems that adapt themselves to changing environments, ...

M/M/1 queues have been traditionally used to model several systems like phone calls at a call center, banking services and so on. However, recent studies showed that it does not model properly a web server system. In this paper we investigate the impact ...

We analyze a distributed variation on the Pólya urn process in which a network of tiny artifacts manages the individual urns. Neighboring urns interact by repeatedly adding the same colored ball based on previous random choices. We discover that the ...

Reputation systems are proved mechanisms used to help nodes to decide whom to trust, to maintain the overall credibility of the system and to promote collaboration. This paper presents Surework, a reputation framework based on Super-peers. In Surework, ...

Increasing scale, dynamism, and complexity of hybrid grids make traditional grid resource scheduling approaches difficult. In such grids, where resource volatility and dynamism is common, self-organization is a key technique for autonomous grid nodes to ...

Distributed applications involving mobile devices interconnected by wireless networks may benefit both from multiagent technology and context-aware programming techniques. We present a system running on a agent platform to allow access to services that ...

This paper proposes and evaluates the performance of a cooperative position fix scheme built on top of a group management mechanism supported typically in the embedded operating system. The main goal is to enhance the accuracy of map matching and thus ...

We present a P2P-based multimedia ubiquitous capture platform tailored to support co-located collaborative work.

This paper presents a strategy to modify a sequential implementation of an H.264/AVC motion estimation to run on a new reconfigurable architecture called RoSA. The modifications aim to provide more parallelism that will be exploited by the architecture. ...

Software-based self-test (SBST) is emerging as a promising technology for enabling at-speed testing of high-speed embedded processors testing in an SoC system. For SBST, test routine development or generation can base on deterministic and random ...

This paper proposes an address compression technique for load/store queue (LSQ) to improve the scalability and power efficiency. A load/store queue (LSQ) typically needs a fully-associative CAM structure to search the address for collision and ...