The chirp function is one of the most fundamental functions in nature. Many natural events can be roughly approximated by a group of chirp functions. In this paper, we present a practical adaptive chirplet based signal approximation algorithm. Unlike the other chirplet decompositions known so far, the elementary chirplet functions employed in this algorithm are adaptive. Therefore, the resultin...

1 Institute of Mathematics and Computing Science, University of Groningen, 9700 AV Groningen, The Netherlands 2 Institute of Applied and Experimental Mechanics, University of Stuttgart, Pfaffenwaldring 9, 70569 Stuttgart, Germany 3Computer Science Department, University of North Carolina, Chapel Hill, NC 27599-3175, USA 4School of Civil and Environmental Engineering and G.W.Woodruff School of M...

A new four-parameter atomic decomposition of chirplets is developed for compact representation of signals with chirp components. The four-parameter atom is obtained by scaling the Gaussian function, and then applying the fractional Fourier transform (FRFT), timeshift and frequency-shift operators to the scaled Gaussian. The decomposition is realized by extending the matching pursuit algorithm t...

Bacillus subtilis utilizes glucose as the preferred source of carbon and energy. The sugar is transported into the cell by a specific permease of the phosphoenolpyruvate:sugar phosphotransferase system (PTS) encoded by the ptsGHI operon. Expression of this operon is induced by glucose and requires the action of a positive transcription factor, the GlcT antiterminator protein. Glucose availabili...

Recent evidence suggests that (a) auditory cortical neurons are tuned to complex timevarying acoustic features, (b) auditory cortex consists of several "elds that decompose sounds in parallel, (c) the metric for such decomposition varies across species, and (d) auditory cortical representations can be rapidly modulated. Past computational models of auditory cortical processing cannot capture su...

The control of several catabolic operons in bacteria by transcription antitermination is mediated by RNA-binding proteins that consist of an RNA-binding domain and two reiterated phosphotransferase system regulation domains (PRDs). The Bacillus subtilis GlcT antitermination protein regulates the expression of the ptsG gene, encoding the glucose-specific enzyme II of the phosphotransferase syste...

Lei GAO ATR Lab,NUDT;Changsha,Hunan,410072, P.R.China. Abstract: A new dictionary D for sparse representation of chirp echo in broadband radar is put forward in this paper. Different from chirplet decomposition which decomposes echo in time-frequency plane, the dictionary D transforms the sparsity of target observed by radar in distance range to the sparsity in frequency domain by stretch proce...