This paper proposes a boosting-like method to train a classifier ensemble from data streams. It naturally adapts to concept drift and allows to quantify the drift in terms of its base learners. The algorithm is empirically shown to outperform learning algorithms that ignore concept drift. It performs no worse than advanced adaptive time window and example selection strategies that store all the...

While previous studies showed that intrinsic optical signals spatially correspond with electrophysiological responses in mammalian visual cortex, the quantitative correspondence of their response strengths is open to question. Measurement of both signals' strength as functions of visual stimulus contrast provides an opportunity for quantitative comparison. Towards that end, the spatial and temp...

Abstract Physical systems undergoing spontaneous pattern formation are governed by intrinsic length scales that may compete with extrinsic ones, resulting in exceptional spatiotemporal behaviour. In this work, we report experimental and theoretical evidence spatial nonuniformity sets Faraday-wave patterns motion, which noticeable the zigzag drift dynamics exhibited their wave crests. We provide...

PSR B0818−41 is one of the few pulsars which show multiple drift regions having well defined phase relationship. In this paper we report new results from the multifrequency observations of this pulsar with the Giant Metrewave Radio Telescope (GMRT). We determine the mean flux of the pulsar at multiple frequencies and find evidence for a low frequency turnover in its spectrum. Significant linear...

Neurons in primary visual cortex of many mammals are clustered according to their preference to stimulus parameters such as orientation and spatial frequency. Nevertheless, responses to complex visual stimuli are highly heterogeneous between adjacent neurons. To investigate the relation between these observations, we recorded from pairs of neighboring neurons in area 17 of anesthetized cats in ...

Junctional Ectopic Tachycardia (JET) is a cardiac arrhythmia which occurs immediately after open heart surgery in young children. In specific populations, JET has extremely high incidence, of up to 50%. There has not been a specific mechanism elucidated by clinical data or basic science. As a widely used vertebrate cardiovascular biological model, zebrafish heart is being studied to reveal the ...