Olmsted syndrome is a rare variety of transgredient palmoplantar keratoderma with an undefined inheritance pattern. It starts in the neonatal period or in childhood and has a progressive and extremely disabling course. We report two new, unrelated patients with Olmsted syndrome, one with the early signs and symptoms of the disorder, the other showing the full-blown spectrum of the syndrome during a 30-year follow-up period.
This paper proposes a wavelet-based power system stabilizer by using both the scaling coefficient energy and the wavelet coefficient energy with border distortions of a one-cycle sliding window. The boundary scaling coefficient energy is used for real-time extraction and compensation of electromechanical oscillations in the synchronous generator, whereas the boundary wavelet coefficient energy is used for the real-time detection of electrical oscillations and for tripping the wavelet-based power system stabilizer at the fault inception time. The performance of the proposed wavelet-based power system stabilizer was assessed in an experimental power system laboratory setup and compared with a conventional power system stabilizer.Index Terms-Wavelet transform, synchronous generator, power system stabilizer, electromechanical oscillations, electrical oscillations.
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