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We report on our research into fluoride fiber-based 3 µm class laser sources. Using holmium as the gain medium, record-high peak power levels are achieved in mode-locked laser systems that emit ultrashort pulses in the water vapor transmission window around 2.9 µm. Highly nonlinear and dispersion-engineered hybrid chalcogenide-polymer microwires are utilized to extend the frequency range of those...
The authors contribute to the spectrum of quality of experience (QoE) research by defining simulation platform for evaluation of VoIP quality of experience over a wireless WiMAX link. In particular the authors show how the Matlab/Simulink and ns2 integration can be facilitated to tackle the QoE aspects in a comprehensive manner. Furthermore the process of measuring QoE using an off-line implementation...
Although by default the Network Simulator 2 (NS2) does not implement the IEEE 802.16 networks, a few patches are available, that provide WiMAX specifications at different fidelity level. The ns2 environment is useful for system-level evaluation, but mainly with respect to wired networks. In order to provide an adequate QoS provisioning to different service flows and to prevent base station (BS) from...
WiMAX (worldwide interoperability for microwave access) based upon the IEEE 802.16 standards is a promising technology for the ??last mile?? wireless Internet access. In order to provide required QoS level to different service flows and to prevent base station (BS) from running out of resources dedicated connection admission control (CAC) algorithm has to be implemented. Since the introduction of...
In the first part of the paper, we prove a generalization of the classical Poincare-Miranda theorem to the case of a denumerable set of continuous functions of denumerable number of variables. The second part of the paper concerns the controllability of nonlinear repetitive processes. First, we formulate a theorem on the existence of a unique solution to such process and theorem on the continuous...
In the paper sufficient conditions for the controllability to the interval of two-dimensional continuous Roesser system and one-dimensional continuous system are proved. The idea of proof is based on applying a lemma which is a multidimensional version of Bolzano-Poincare theorem.
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