By Wohed P., van der Aalst W.M.P., Dumas M.

Net providers composition is an rising paradigm for program integration inside of and throughout organizational barriers. A panorama of languages and methods for net companies composition has emerged and is always being enriched with new proposals from assorted owners and coalitions. although, little attempt has been devoted to systematically assessment the services and boundaries of those languages and strategies. The paintings pronounced during this paper is a step during this course. It provides an in-depth research of the enterprise technique Execution Language for net prone (BPEL4WS) with appreciate to a framework composed of workflow and verbal exchange styles. keyword phrases: net companies composition, enterprise approach modeling, interorganizational workflow, BPEL4WS.

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Some key factors affecting routing scalability, as well as some basic principles of designing scalable routing protocols are presented by Yo [122]. In summary, as proved by the Internet’s own existence, the hierarchical routing architecture is both scalable and robust. However, it should be noted that one of the main motivations behind these desirable properties is the weak semantic of the best effort service. The best effort service does not provide any reliability or timeliness guarantees. As long as a “reasonable” number of packets reach their destinations, packet loss and packet reordering are acceptable.

For this reason, most analytical studies assume an outputqueueing router model. On the downside, the output-queueing router architecture requires a speedup as high as n, where n is the number of inputs. The worst case scenario occurs when all inputs simultaneously receive packets for the same 1 The most common metric used in today’s Internet is the number of routers (hops) on the path. 16 2 Background output. Since inputs are bufferless, the output has to be able to simultaneously receive the n packets, hence the speedup of n.

The most widely utilized form of congestion control is the additiveincrease/multiplicative-decrease scheme implemented by TCP [57, 83], a scheme which has proven to be highly successful in preventing congestion collapse2 . However, the viability of this approach depends on one fundamental assumption: all end-hosts cooperate by implementing equivalent congestion control algorithms. 2 Congestion collapse occurs when sources increase their sending rates when they experience losses, in the hope that more of their packets will get through.

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Analysis of Web Services Composition Languages: The Case of BPEL4WS by Wohed P., van der Aalst W.M.P., Dumas M.


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