Making recognition more reliable under uncontrolled lighting conditions is one of the most important challenges for practical face recognition systems. Other recognition systems don’t nullify most of the lighting variations. We tackle this by combining the strengths of robust illumination normalization, local texture-based face representations, distance transform based matching and kernel based...

Many computational schemes in Linear Algebra can be studied from the point of view of TimeVarying Linear Systems theory. This approach not only puts a variety of results in a unified framework, but also generates new and unexpected results such as strong approximations of operators or matrices by computational networks of low complexity, and the embedding of contractive operations in orthogonal...

We consider a single-link multi-source network with FAST TCP sources. We adopt a continuous-time dynamic model for FAST TCP sources, and propose a static model to adequately describe the queuing delay dynamics at the link. The proposed model turns out to have a structure that reveals the time-varying network feedback delay, which allows us to analyze FAST TCP with due consideration of the time-...

where P (t, λ) is a Poisson process with rate λ and Di for i ≥ 0 are i.i.d. random variables whose logarithm is uniformly distributed: logDi = U(log 0.25, log 32.0) between the logarithms of 0.25 and 32.0. This results in a distribution where the density is inversely proportional to the value. This is very important for the results below, because different distributions would emphasize either s...

At present, there are no effective methods for modeling on representing sequence containing position information in some special problems. A novel varying-radix numeration system is proposed to solve this kind of problems. This varying-radix numeration system differs from common fixed radixes numeration systems. The applications of varying-radix numeration system in a First-In-Last-Out (FILO) s...

In most social, information, and collaboration systems the complex activity of agents generates rapidly evolving time-varying networks. Temporal changes in the network structure and the dynamical processes occurring on its fabric are usually coupled in ways that still challenge our mathematical or computational modelling. Here we analyse a mobile call dataset describing the activity of millions...

nowadays with increasing use of numerous nonlinear loads, voltage and current harmonics in power systems are one of the most important problems power engineers encounter. many of these nonlinear loads, because of their dynamic natures, inject time-varying harmonics into power system. common techniques applied for harmonics measurement and assessment such as fft have significant errors in presen...

Nowadays with increasing use of numerous nonlinear loads, voltage and current harmonics in power systems are one of the most important problems power engineers encounter. Many of these nonlinear loads, because of their dynamic natures, inject time-varying harmonics into power system. Common techniques applied for harmonics measurement and assessment such as FFT have significant errors in presen...