منابع مشابه
Will point sources spoil 21 cm tomography ?
21 cm tomography is emerging as a promising probe of the cosmological dark ages and the epoch of reionization, as well as a tool for observational cosmology in general. However, serious sources of foreground contamination must be subtracted for experimental efforts to be viable. In this paper, we focus on the removal of unresolved extragalactic point sources with smooth spectra, and evaluate ho...
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We explore the ability of measurements of the 21-cm power spectrum during reionization to enable the simultaneous reconstruction of the reionization history and the properties of the ionizing sources. For various sets of simulated 21-cm measurements, we perform maximum likelihood fits in order to constrain the reionization and galaxy formation histories. We employ a flexible six-parameter model...
متن کاملBlind Separation of Delayed and Convolved Sources
We address the difficult problem of separating multiple speakers with multiple microphones in a real room. We combine the work of Torkkola and Amari, Cichocki and Yang, to give Natural Gradient information maximisation rules for recurrent (IIR) networks, blindly adjusting delays, separating and deconvolving mixed signals. While they work well on simulated data, these rules fail in real rooms wh...
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BACKGROUND AND OBJECTIVES Our objectives were to determine the distribution of errors and estimate the magnitude of the burden of delayed payments in a large physician group practice. METHODS A 25% random sample (n=775) was taken from all billed records of a physician group practice in the Pacific Northwest that were delayed 6 months or more as of June 30, 2001. The source and specific reason...
متن کاملBlind Separation of Sources from Their Delayed Mixtures
We give a near real-time algorithm for the blind separation of sources from mixtures of delayed sources. Many successful algorithms have been proposed for blind separation of instantaneous mixtures. For delayed mixtures only a few algorithms have been reported, and they assume only cross delays between mixed sources. Moreover, the weights and cross delays are updated in a batch mode, which is n...
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ژورنال
عنوان ژورنال: AUDIOLOGY JAPAN
سال: 1996
ISSN: 1883-7301,0303-8106
DOI: 10.4295/audiology.39.497