F. K. Widjanarko

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This paper describes version three of UltraSAN, a software environment for the performance, dependability , and performability e v aluation of computer networks and systems. The package makes use of both analytic-and simulation-based solution methods using a single, high-level, representation known as stochas-tic activity networks. Version three, just(More)
General Packet Radio Service has been developed to enhance the GSM telecommunication system with the addition of packet-switched capabilities, as the key enabler for the integration between wireless transmission and Internet data services. Analyses of the GPRS expected behavior have been performed essentially focusing on measures like throughput and delay(More)
This thesis has been submitted in partial fullllment of requirements for an advanced degree at The University of Arizona and is deposited in the University Library to be made available to borrowers under rules of the Library. Brief quotations from this thesis are allowable without special permission, provided that accurate acknowledgment of source is made.(More)
Model-based evaluation of computer systems and networks is an increasingly important activity. For modeling to be used eeectively, software environments are needed that ease model speciication, construction, and solution. Easy to use, graphical methods for model speciication that support solution of families of models with diiering parameter values, are(More)
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