Heart rate variability (HRV) is frequently used to measure autonomic nervous system (ANS) activity. However, little is known about the mechanism underlying pharmacologically induced changes in HRV. Previous research has shown that nicotine exposure stimulates the ANS, mediating a wide spectrum of physiological and behavioral effects, including altered respiratory sinus arrhythmia and enhanced a...

A hidden Markov model (HMM) is a bivariate Markov chain which encodes information about the evolution of a time series. HMMs can faithfully represent workloads for discrete time processes and therefore be used as portable benchmarks to explain and predict the complex behaviour of these processes. This project introduces the main concepts of HMMs for discrete time series including a summary of H...

We present 3 open challenges in the field of Costas arrays. They are: a) the determination of the number of dots on the main diagonal of a Welch array, and especially the maximal such number for a Welch array of a given order; b) the conjecture that the fraction of Welch arrays without dots on the main diagonal behaves asymptotically as the fraction of permutations without fixed points and henc...

References 1. Levine SR, Welch KMA: Cerebrovascular ischemia associated with lupus anticoagulant. Stroke 1987; 18:257-263 2. Levine SR, Welch KMA: The spectrum of neurological disease associated with antiphospholipid antibodies: Lupus anticoagulants and anticardiolipin antibodies. Arch Neurol 1987;44: 876-883 3. Levine SR, Welch KMA: Antiphospholipid antibodies. Ann Neurol 1989;26:386-389 4. Ya...

Technology is growing in every aspect but the basic needs to save the memory and time utilization still remains. Whenever we deal with any kind of data, we are bound to compress the data to minimize the space utilization. Data compression can be lossy or lossless. Some efficient lossless data compression techniques are Huffman coding, Run-length coding, LempelZiv-Welch (LZW) coding. Lempel–Ziv–...

94304 Abstract The paper describes an algorithm that employs English and French text taggers to associate noun phrases in an aligned bilingual corpus. The tag-gets provide part-of-speech categories which are used by finite-state recognizers to extract simple noun phrases for both languages. Noun phrases are then mapped to each other using an iterative re-estimation algorithm that bears similari...