A key challenge in multi-vendor heterogeneous virtual optical networks is providing transparent access to network resources and virtual functions in a manner that enables users to combine them appropriately into meaningful end-to-end services. In this paper, we present a solution that consists of two components: an open marketplace where vendors and users of network resources and functions meet...

Many applications designed for wide-area systems use replication to provide a service at multiple locations. From which site should a client choose to obtain service? A client can specify its needs in terms of communication latency, bandwidth, or error rate. This specification must be matched against the expected performance available from each site. I present the results of two experiments tha...

E-businesses using enterprise resource planning systems as the information infrastructure generate a tremendous amount of information, including information about customers, suppliers, markets, transaction costs, the prices at which products are bought and sold, and order-fulfillment rates, etc. To turn the information contained in these systems into marketable information goods would be a key ...

In this paper, we propose a practical and efficient technique, Forecaster, to estimate (1) the end-to-end available bandwidth, and (2) the speed of the most congested (tight) link along an Internet path. Forecaster is practical since it does not assume any a priori knowledge about the measured path, does not make any simplifying assumptions about the nature of cross-traffic, does not assume the...

A good dialogue agent should have the ability to interact with users. In this work, we explore this direction by designing a simulator and a set of synthetic tasks in the movie domain that allow the learner to interact with a teacher by both asking and answering questions. We investigate how a learner can benefit from asking questions in both an offline and online reinforcement learning setting...

This paper presents a survey on transport and routing protocols for wireless sensor networks (WSN). Research challenges regarding the problem of end-to-end reliability are addressed in particular.

In this paper, we develop methods for constructing votebuying/coercion attacks on end-to-end voting systems, and describe votebuying/coercion attacks on three proposed end-to-end voting systems: Punchscan, Prêt-à-voter , and ThreeBallot. We also demonstrate a different attack on Punchscan, which could permit corrupt election officials to change votes without detection in some cases. Additionall...

A computer network consists of a set of computing nodes interconnected via communication channels. It is commonly assumed that, for each pair of network nodes u and v, there is at most one channel from u to v. However, it is often desirable to have multiple channels between nodes. That is, for every pair of network nodes u and v, there may be multiple channels from u to v. In this paper, we con...

Although packet delay and loss are two important parameters of the Internet performance, to the best of our knowledge, the evolution of large-scale IPv6 delay and loss performance has previously not been studied. In this paper, we analyze more than 600 end-to-end IPv6 paths between about 26 testboxes of RIPE Network Coordination Centre over two years, and compare the delay and loss performance ...

Several access protocols are proposed to support different service classes in an optical burst switched ring. Their performance is evaluated through simulation. Various performance metrics such as throughput, utilization, burst loss rate, end-to-end delay and fairness are used to analyze the behaviour of each protocol.