and more large-delay satellite links. To address this problem, we develop a novel approach to Internet congestion control that outperforms TCP in conventional environments, and remains efficient, fair, scalable, and stable as the bandwidth-delay product increases. This new eXplicit Control Protocol, XCP

Cooperative diversity has been recently proposed as a way to form virtual antenna arrays that provide dramatic gains in slow fading wireless environments. However, most of the proposed solutions require distributed space–time coding algorithms, the careful design of which is left for future

o widen the range of application and deployment of robots, both in research and in industrial contexts, we need to develop more powerful and flexible robotic systems exhibiting higher degrees of autonomy and able to sense, plan, and operate in unstructured environments. For that, the robot must

Abstract- There are new system implementation challenges involved in the design of cognitive radios, which have both the ability to sense the spectral environment and the flexibility to adapt transmission parameters to maximize system capacity while co-existing with legacy wireless networks

. In this paper, we present Rivet's architecture, focusing on its support for varied data sources, interactivity, composition and user-defined data transformations. We also describe the challenges of implementing this architecture efficiently and flexibly. We conclude with several examples of computer

heterogeneity of resources, which make uniform allocation algorithms difficult to formulate, and distributed ownership, leading to widely varying allocation policies. Faced with these problems, we developed and implemented the classified advertisement (classad) matchmaking framework, a flexible and general

are ineffective in these environments. In this paper we introduce a query processing mechanism called an eddy, which continuously reorders operators in a query plan as it runs. We characterize the moments of symmetry during which pipelined joins can be easily reordered, and the synchronization barriers

very flexible, thereby providing support for diverse networking environments and usage scenarios. It accommodates a variety of policies for when and where to propagate updates. It operates over diverse network topologies, including low-bandwidth links. It is incremental. It enables replica convergence

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This paper reports on the modelling and solution of a large industrial combinatorial optimization problem using the ECL i PS e Constraint Logic Programming (CLP) platform. The problem is fleet assignment: the assignment of a set of aircraft of different types to a predefined shedule of flights. A single underlying model was developed and solved in ECL i PS e . Three optimization methods were applied in three stages of model development and solution. The three methods were used to meet different objectives. The first was depth first search branch and bound optimization in conjunction with Finite Domain propagation. This straightforward approach was used to develop and validate the model in the ECL i PS e platform. The second was mixed integer programming. The CLP model and solutions were exported to a mathematical solver and used to produce a globally optimal solution. Knowing the optimal solution is desirable, however obtaining good solutions close to the user's actual assi...