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Cognitive radio devices dynamically share unused sections of the radio spectrum. Under current spectrum regulations different secondary users accessing these unused sections have equal access rights, and they will interfere when operating on the same spectrum resources at the same time instance. A coexistence solution between secondary users is needed to resolve this. We propose a coexistence solution...
A server farm is examined, where a number of servers are used to offer a service to impatient customers. Every completed request generates a certain amount of profit, running servers consume electricity for power and cooling, while waiting customers might leave the system before receiving service if they experience excessive delays. A dynamic allocation policy aiming at satisfying the conflicting...
Cloud computing is fundamentally altering the expectations for how and when computing, storage and networking resources should be allocated, managed and consumed. End-users are increasingly sensitive to the latency of services they consume. Service Developers want the Service Providers to ensure or provide the capability to dynamically allocate and manage resources in response to changing demand patterns...
Staged design has been introduced as a programming paradigm to implement high performance Internet services that avoids the pitfalls related to conventional concurrency models. However, this design presents challenges concerning resource allocation to the individual stages, which have different demands that change during execution. On the other hand, processing resources have been shown to form the...
One of the main advantages of HPC clusters is the flexibility and efficiency they bring to their user. With the increasing number of applications being served by HPC systems, new systems need to serve multiple users and multiple applications. Traditional HPC systems typically served a single application at a given time, but to maintain maximum flexibility a new concept of ldquoHPC as a servicerdquo...
At present, Web applications and HTTP requests on the Internet are so explosively increasing that a large number of hot Web sites frequently confront with problems of server overloading. And how to provide various web services with high-level quality and satisfactory performance for Web clients has become one of the most urgent points we concern. In order to smoothly solve these problems, we proposed...
IEEE P1900.4 is an emerging standard for optimized radio resource utilization where cognitive radio technologies are used for efficient spectrum utilization. In this paper, we design and implement a cognitive wireless network system based on open documents of IEEE P1900.4, and evaluate its performance using UDP streaming and HTTP download. Our experiments show interesting results that total network...
Peer-to-peer (P2P) networks are becoming increasingly popular and are an exciting new class of innovative, internet-based resource sharing systems. In a P2P network, a reputation system is essential to evaluate the trustworthiness of participating peers and to combat the selfish, dishonest, and malicious peer behaviors. The system collects locally-generated peer feedbacks and aggregates them to yield...
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