This paper considers the problem of learning task specific web-service descriptions from traces of users successfully completing a task. Unlike prior approaches, we take a traditional machine-learning perspective to the construction of webservice models from data. Our representation models both syntactic features of web-service schemas (including lists and optional elements), as well as semanti...

Abstract: The present investigation deals with M/G/1 retrial queue with unreliable server and general retrial times. The server is subject to breakdowns and takes some setup time before starting the repair. The server renders first essential phase of service (FES) to all the arriving customers whereas second optional phase services (SOS) are provided after FES to only those customers who opt fo...

This paper addresses open job scheduling questions for the challenge workloads that run on the large scale parallel systems at supercomputer centers. Simulation results for six recent one-month job traces from the NCSA Origin 2000 (O2K) system are used to evaluate (1) the experimentally tuned NCSA LSF* policy, (2) the FCFS-backfill policy, (3) the Priority-backfill policy with alternative prior...

Digital video broadcast-terrestrial 2 (DVB-T2) is the successor of DVB-T standard that allows a two-dimensional multiplexing of broadcast services in time and frequency domains. It introduces an optional time-frequency slicing (TFS) transmission scheme to increase the flexibility of service multiplexing. Utilizing statistical multiplexing (StatMux) in conjunction with TFS is expected to provide...

We describe the implementation and evaluate the performance of a Replica Location Service that is part of the Globus Toolkit Versions 3.0 and 4.0. A Replica Location Service (RLS) provides a mechanism for registering the existence of replicas and discovering them. Features of our implementation include the use of soft state update protocols to populate a distributed index and optional Bloom fil...

Service evolution requires sound strategies to appropriately manage versions resulting from changes during service lifecycle. Compatibility addresses the graceful evolution of services by considering the effects of changes on client applications. Traditionally, compatibility assessment is restricted to the worst-case scenario, because the analysis is based on the documents that describe service...