Mehmet Karaul

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The World Wide Web has the potential of being used as an inexpensive and convenient metacomputing resource. This brings forward new challenges and invalidates many of the assumptions made in offering the same functionality for a network of workstations. We have designed and implemented Charlotte which goes beyond providinga set of features commonly used for(More)
Telecommunication switches implement overload controls to maintain call throughput and delay at acceptable levels during periods of high load. Existing work has mostly focused on controls under sustained overload–they do not meet the demands of modern telecommunication systems where the increased number of services and mobile subscribers often creates fast(More)
Java in combination with Web browsers’ abilities to load and execute untrusted Java applets in a secure fashion has made computing over the Web a possibility. Now the challenge is to fully utilize this potential, given the limitations imposed by browsers. This paper presents KnittingFactory, an infrastructure to facilitate Web-based computing, which(More)
We propose multi-class signaling overload control algorithms, for telecommunication switches, that are robust against different input traffic patterns and system upgrades. In order to appropriately measure the system load when several classes of signaling traffic are present, we first introduce the concept of equivalent system load measure that converts the(More)
Many popular Web sites employ a set geographically dispersed, replicated servers to address the issue of overloaded servers and network congestion. Such distributed Web sites require allocation mechanisms to dispatch request in a way such that any desired load distribution can be enforced. Unlike most traditional approadms, we propose a technique which(More)
To Helen and Zachary iv Acknowledgements I want to thank Zvi for being a great advisor. He always puts his students first, and he has given me all the support I needed throughout my studies. I am grateful to him for teaching me to distinguish between important details I should pay attention to and unnecessary cludder which I should dispose of; he pushed the(More)
Internet telephony and mobile telephony are both growing very rapidly. Directly interworking the two presents significant advantages over connecting them through an intermediate PSTN link. We propose three novel schemes for the most complex aspect of the interworking: call delivery from an Internet telephony (SIP) terminal to a mobile telephony (UMTS)(More)
With the rapid growth of the World Wide Web, clients attempting to access some popular web sites are experiencing slow response times due to server load and network congestion. Replacing the single server machine with a set of replicated servers is a cost-effective solution to partition server load which also allows incremental scalability and fault(More)
Current-day applications are written to execute on a wide range of platforms ranging from fast desktop computers to mobile laptops all the way to hand-held PDAs and cellular phones, spanning several orders of magnitude in processing, storage, and communication capabilities. Applications running on these platforms may exhibit diverse and unpredictable(More)
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