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Entropy, Volume 25, Issue 9

September 2023 - 122 articles

Cover Story: Separating frequency hopping signals blindly raises the question of whether each frequency originates from an individual source or whether multiple frequencies are transmitted by the same source. In this work, carrier frequencies and DOAs are estimated for signals transmitted by stationary and spatially sparse sources observed over a Spatial Channel Model. These two estimates are paired to ascertain which source(s) transmit which frequency(ies), thus achieving blind source separation. In a multipath scenario, a signal transmitted by one source may appear to be coming from different directions, leading to erroneous DOA estimation. A filtering technique is developed to refine DOA estimates for sources whose intermittent activity follows a hidden Markov model. View this paper
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Articles (122)

  • Article
  • Open Access
1,726 Views
16 Pages

21 September 2023

The inherent non-smoothness of the vibroimpact system leads to complex behaviors and a strong sensitivity to parameter changes. Unfortunately, uncertainties and errors in system parameters are inevitable in mechanical engineering. Therefore, investig...

  • Article
  • Open Access
4 Citations
2,502 Views
11 Pages

21 September 2023

Entropy-based and fractal-based metrics derived from heart rate variability (HRV) have enriched the way cardiovascular dynamics can be described in terms of complexity. The most commonly used multifractal testing, a method using q moments to explore...

  • Article
  • Open Access
8 Citations
2,006 Views
12 Pages

21 September 2023

The effects of nonextensive electrons on nonlinear ion acoustic waves in dusty negative ion plasmas with ion–dust collisions are investigated. Analytical results show that both solitary and shock waves are supported in this system. The wave pro...

  • Article
  • Open Access
9 Citations
5,140 Views
18 Pages

A Quantum Model of Trust Calibration in Human–AI Interactions

  • Luisa Roeder,
  • Pamela Hoyte,
  • Johan van der Meer,
  • Lauren Fell,
  • Patrick Johnston,
  • Graham Kerr and
  • Peter Bruza

20 September 2023

This exploratory study investigates a human agent’s evolving judgements of reliability when interacting with an AI system. Two aims drove this investigation: (1) compare the predictive performance of quantum vs. Markov random walk models regard...

  • Article
  • Open Access
8 Citations
2,979 Views
54 Pages

Quantum and Quantum-Inspired Stereographic K Nearest-Neighbour Clustering

  • Alonso Viladomat Jasso,
  • Ark Modi,
  • Roberto Ferrara,
  • Christian Deppe,
  • Janis Nötzel,
  • Fred Fung and
  • Maximilian Schädler

20 September 2023

Nearest-neighbour clustering is a simple yet powerful machine learning algorithm that finds natural application in the decoding of signals in classical optical-fibre communication systems. Quantum k-means clustering promises a speed-up over the class...

  • Article
  • Open Access
8 Citations
2,257 Views
22 Pages

Community-Based Matrix Factorization (CBMF) Approach for Enhancing Quality of Recommendations

  • Srilatha Tokala,
  • Murali Krishna Enduri,
  • T. Jaya Lakshmi and
  • Hemlata Sharma

20 September 2023

Matrix factorization is a long-established method employed for analyzing and extracting valuable insight recommendations from complex networks containing user ratings. The execution time and computational resources demanded by these algorithms pose l...

  • Article
  • Open Access
3 Citations
2,133 Views
26 Pages

A New Truncated Lindley-Generated Family of Distributions: Properties, Regression Analysis, and Applications

  • Mohamed Hussein,
  • Gabriela M. Rodrigues,
  • Edwin M. M. Ortega,
  • Roberto Vila and
  • Howaida Elsayed

20 September 2023

We present the truncated Lindley-G (TLG) model, a novel class of probability distributions with an additional shape parameter, by composing a unit distribution called the truncated Lindley distribution with a parent distribution function G(x). The pr...

  • Article
  • Open Access
7 Citations
2,515 Views
16 Pages

20 September 2023

A vehicular network embodies a specialized variant of wireless network systems, characterized by its capability to facilitate inter-vehicular communication and connectivity with the encompassing infrastructure. With the rapid development of wireless...

  • Article
  • Open Access
5 Citations
2,032 Views
13 Pages

20 September 2023

We investigate the dynamics of a system composed of two different subsystems when subjected to different nonlinear Fokker–Planck equations by considering the H–theorem. We use the H–theorem to obtain the conditions required to estab...

  • Feature Paper
  • Article
  • Open Access
1,863 Views
11 Pages

20 September 2023

Counterfactual definiteness (CFD) means that if some property is measured in some context, then the outcome of the measurement would have been the same had this property been measured in a different context. A context includes all other measurements...

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Entropy - ISSN 1099-4300