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As multi-core systems begin to appear, their possible applications, parallel performance and on-chip interconnection networks have to be clarified, analyzed and optimized. The paper investigates an impact of collective communication (CC) overhead that may be critical for performance of parallel applications. Two potential topologies of networks on chip (NoC) are investigated, a ring-based network...
A new low-jitter polyphase-filter-based frequency multiplier incorporating a phase error calibration circuit to reduce the phase errors is presented. Designing with a multiplication ratio of eight, it has been fabricated in a 0.13-mum CMOS process. For input frequency of 25 MHz, the measured jitter is 2.46 ps (rms) and plusmn9.33 ps (pk-pk) at 200-MHz output frequency, while achievable maximum static...
Adaptive routing is once again becoming of interest because of the possibility to couple on-line probing in networks with real-time dynamic and distributed control of paths and flows. Wireless networks, with their rapidly changing network conditions also create a need to revisit this issue. This paper uses measurements in a wired adaptive network test-bed, the cognitive packet network (CPN), to investigate...
Three applications in wireless networks where model-free stochastic learning is applicable, are discussed. The learning based optimization problems are formulated and simulation results are presented. Some open issues are also discussed.
It is becoming increasingly difficult to implement effective systems for preventing network attacks, due to the combination of (1) the rising sophistication of attacks requiring more complex analysis to detect, (2) the relentless growth in the volume of network traffic that we must analyze, and, critically, (3) the failure in recent years for uniprocessor performance to sustain the exponential gains...
Todaypsilas access network is migrating towards broadband IP, fixed/mobile convergence and service convergence. Thus, the next generation access network (NGAN) requires a converged optical/wireless access network infrastructure, other than the existing architecture that connect to the cellular, broadband wireless, and optical access networks separately, which complicate the network and increase the...
Fat-trees are a class of routing networks for hardwareefficient parallel computation. This paper presents a randomized algorithm for routing messages on a fat-tree. The quality of the algorithm is measured in terms of the load factor of a set of messages to be routed, which is a lower bound on the time required to deliver the messages. We show that if a set of messages has load factor λ = Ω(lg n lg...
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