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A model of energy consumption in IP networks is used to estimate the energy consumption of the public Internet. Today’s Internet uses less than 1% of the available electricity supply. However, network energy consumption could grow substantially as access rates increase.
A new pub/sub/query (PSQ) paradigm has been developed for the information management of high performance computers. The main advantage of PSQ over Message Passing Interface (MPI) is the ability to adapt to dynamically changing requirements. Information management for high performance computing (HPC) applications also coordinates the distribution of data across processing nodes, both for initial data...
We simulate the rate equations of nanocavity lasers, introducing gain compression of both the stimulated and spontaneous emission. The resonance frequency and damping are simultaneously enhanced by the Purcell effect, greatly limiting the modulation bandwidth.
In the commonwealth of Virginia, essential transportation functions such as traffic flow monitoring and incident management are remotely managed via traffic management centers (TMCs). TMCs provide the vital support for meeting the Virginia department of transportationpsilas (VDOTpsilas) goals of sustaining safe and efficient workforce mobility, commodity flow, and accessibility to critical service...
Imagery pattern recognition (IPR) is becoming more challenging as image resolutions continue to improve and algorithms become more complex. Systems for analysis are being developed on increasingly diverse and heterogeneous platforms, from hardware support using field programmable gate arrays, graphics processing units, and Cell processors to high performance computers, featuring multi-core processors...
We propose the concept of performance monitoring through channel estimation by receiver signal processing. We show that in coherent-optical-orthogonal-frequency-division-multiplexed (CO-OFDM) systems, critical optical system parameters can be accurately monitored without resorting to separate monitoring devices.
We report a repeater-based access system using VCSEL transmitters and multi-mode fibres. The system has extended reach and wide coverage area, and potentially delivers low-cost access solution. System demonstration shows similar performance to standard PON.
We propose and experimentally demonstrate a 155 Mb/s digital channel subcarrier-multiplexed with a 1.25 Gb/s burst-mode upstream signal at a PON repeater, and show how this system can be used to transmit digitized video signals to a security system from surveillance cameras installed around multi-dwelling units.
We study the Viterbi equalizers for chromatic dispersion and PMD mitigation in 10 Gb/s NRZ-DPSK and NRZ-DQPSK systems. Monte Carlo simulations are used to assess the performance of the Viterbi equalizers.
We propose and experimentally demonstrate selective digital video broadcasting over a WDM PON by the use of laser bias control, time division multiplexing of voice/data and digital video signals, and reflective semiconductor optical amplifier (RSOA).
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