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Entropy, Volume 23, Issue 12

2021 December - 151 articles

Cover Story: Historically, quantifying the complexity of graphs and networks has been of great interest to scientists in different fields. In this paper, we have tackled this problem using Kolmogorov complexity as the metric. Firstly, ‘Kolmogorov basic graphs’ are defined as those with the least possible Kolmogorov complexity. These graphs are then seen as the building blocks for constructing any given graph. Consequently, the complexity of a graph is estimated by decomposing it into a set of Kolmogorov basic graphs. The result is an algorithm, called ‘Kolmogorov graph covering’, which takes a graph as an input and returns an upper bound for its Kolmogorov complexity. View this paper.
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Articles (151)

  • Article
  • Open Access
9 Citations
4,217 Views
28 Pages

Whether the Support Region of Three-Bit Uniform Quantizer Has a Strong Impact on Post-Training Quantization for MNIST Dataset?

  • Jelena Nikolić,
  • Zoran Perić,
  • Danijela Aleksić,
  • Stefan Tomić and
  • Aleksandra Jovanović

20 December 2021

Driven by the need for the compression of weights in neural networks (NNs), which is especially beneficial for edge devices with a constrained resource, and by the need to utilize the simplest possible quantization model, in this paper, we study the...

  • Article
  • Open Access
42 Citations
4,361 Views
32 Pages

20 December 2021

Image segmentation is a fundamental but essential step in image processing because it dramatically influences posterior image analysis. Multilevel thresholding image segmentation is one of the most popular image segmentation techniques, and many rese...

  • Concept Paper
  • Open Access
6 Citations
7,900 Views
37 Pages

20 December 2021

What do bacteria, cells, organs, people, and social communities have in common? At first sight, perhaps not much. They involve totally different agents and scale levels of observation. On second thought, however, perhaps they share everything. A grow...

  • Article
  • Open Access
4 Citations
3,233 Views
14 Pages

20 December 2021

Active object recognition (AOR) aims at collecting additional information to improve recognition performance by purposefully adjusting the viewpoint of an agent. How to determine the next best viewpoint of the agent, i.e., viewpoint planning (VP), is...

  • Article
  • Open Access
35 Citations
4,334 Views
25 Pages

20 December 2021

Earlier studies have shown that classification accuracies of Bayesian networks (BNs) obtained by maximizing the conditional log likelihood (CLL) of a class variable, given the feature variables, were higher than those obtained by maximizing the margi...

  • Article
  • Open Access
14 Citations
4,371 Views
17 Pages

20 December 2021

The multi-disc wet clutch is widely used in transmission systems as it transfers the torque and power between the gearbox and the driving engine. During service, the buckling of the friction components in the wet clutch is inevitable, which can short...

  • Article
  • Open Access
6 Citations
3,819 Views
12 Pages

19 December 2021

We perform security analysis of a passive continuous-variable quantum key distribution (CV-QKD) protocol by considering the finite-size effect. In the passive CV-QKD scheme, Alice utilizes thermal sources to passively make preparation of quantum stat...

  • Article
  • Open Access
6 Citations
4,893 Views
20 Pages

18 December 2021

The main purpose of the study is to investigate how price fluctuations of a sovereign currency are transmitted among currencies and what network traits and currency relationships are formed in this process under the background of economic globalizati...

  • Article
  • Open Access
7 Citations
4,256 Views
21 Pages

18 December 2021

This article presents the author’s own metaheuristic cryptanalytic attack based on the use of differential cryptanalysis (DC) methods and memetic algorithms (MA) that improve the local search process through simulated annealing (SA). The sugges...

  • Article
  • Open Access
27 Citations
6,509 Views
14 Pages

MFF-Net: Deepfake Detection Network Based on Multi-Feature Fusion

  • Lei Zhao,
  • Mingcheng Zhang,
  • Hongwei Ding and
  • Xiaohui Cui

17 December 2021

Significant progress has been made in generating counterfeit images and videos. Forged videos generated by deepfaking have been widely spread and have caused severe societal impacts, which stir up public concern about automatic deepfake detection tec...

  • Feature Paper
  • Article
  • Open Access
5 Citations
3,139 Views
20 Pages

17 December 2021

We consider the problem of encoding a deterministic source sequence (i.e., individual sequence) for the degraded wiretap channel by means of an encoder and decoder that can both be implemented as finite-state machines. Our first main result is a nece...

  • Article
  • Open Access
2 Citations
4,794 Views
26 Pages

Interactive System for Similarity-Based Inspection and Assessment of the Well-Being of mHealth Users

  • Subash Prakash,
  • Vishnu Unnikrishnan,
  • Rüdiger Pryss,
  • Robin Kraft,
  • Johannes Schobel,
  • Ronny Hannemann,
  • Berthold Langguth,
  • Winfried Schlee and
  • Myra Spiliopoulou

17 December 2021

Recent digitization technologies empower mHealth users to conveniently record their Ecological Momentary Assessments (EMA) through web applications, smartphones, and wearable devices. These recordings can help clinicians understand how the users&rsqu...

  • Article
  • Open Access
12 Citations
3,669 Views
20 Pages

16 December 2021

An Ms7.0 earthquake struck Jiuzhaigou (China) on 8 August 2017. The epicenter was in the eastern margin of the Tibetan Plateau, an area covered by a dense time-varying gravity observation network. Data from seven repeated high-precision hybrid gravit...

  • Article
  • Open Access
2 Citations
2,632 Views
12 Pages

16 December 2021

In this paper, we introduce new divergences called Jensen–Sharma–Mittal and Jeffreys–Sharma–Mittal in relation to convex functions. Some theorems, which give the lower and upper bounds for two new introduced divergences, are p...

  • Article
  • Open Access
20 Citations
5,685 Views
18 Pages

16 December 2021

Thanks to the tractability of their likelihood, several deep generative models show promise for seemingly straightforward but important applications like anomaly detection, uncertainty estimation, and active learning. However, the likelihood values e...

  • Article
  • Open Access
3 Citations
3,377 Views
11 Pages

16 December 2021

In the continuous variable measurement-device-independent quantum key distribution (CV-MDI-QKD) protocol, both Alice and Bob send quantum states to an untrusted third party, Charlie, for detection through the quantum channel. In this paper, we mainly...

  • Article
  • Open Access
32 Citations
4,956 Views
19 Pages

15 December 2021

This paper develops explicit and consistent definitions of the independent thermodynamic properties of temperature and the kappa index within the framework of nonextensive statistical mechanics and shows their connection with the formalism of kappa d...

  • Article
  • Open Access
11 Citations
2,977 Views
24 Pages

15 December 2021

Without assuming any functional or distributional structure, we select collections of major factors embedded within response-versus-covariate (Re-Co) dynamics via selection criteria [C1: confirmable] and [C2: irrepaceable], which are based on informa...

  • Article
  • Open Access
8 Citations
4,010 Views
21 Pages

Study of Nonlinear Models of Oscillatory Systems by Applying an Intelligent Computational Technique

  • Naveed Ahmad Khan,
  • Fahad Sameer Alshammari,
  • Carlos Andrés Tavera Romero and
  • Muhammad Sulaiman

15 December 2021

In this paper, we have analyzed the mathematical model of various nonlinear oscillators arising in different fields of engineering. Further, approximate solutions for different variations in oscillators are studied by using feedforward neural network...

  • Article
  • Open Access
2 Citations
3,360 Views
17 Pages

15 December 2021

A convolutional neural network can easily fall into local minima for insufficient data, and the needed training is unstable. Many current methods are used to solve these problems by adding pedestrian attributes, pedestrian postures, and other auxilia...

  • Perspective
  • Open Access
6 Citations
4,569 Views
10 Pages

Radical Complexity

  • Jean-Philippe Bouchaud

14 December 2021

This is an informal and sketchy review of five topical, somewhat unrelated subjects in quantitative finance and econophysics: (i) models of price changes; (ii) linear correlations and random matrix theory; (iii) non-linear dependence copulas; (iv) hi...

  • Article
  • Open Access
6 Citations
2,894 Views
12 Pages

14 December 2021

We study the lock-in effect in a network of task assignments. Agents have a heterogeneous fitness for solving tasks and can redistribute unfinished tasks to other agents. They learn over time to whom to reassign tasks and preferably choose agents wit...

  • Article
  • Open Access
3 Citations
2,973 Views
25 Pages

14 December 2021

In this work, we consider the zero-delay transmission of bivariate Gaussian sources over a Gaussian broadcast channel with one-bit analog-to-digital converter (ADC) front ends. An outer bound on the conditional distortion region is derived. Focusing...

  • Article
  • Open Access
26 Citations
7,145 Views
20 Pages

14 December 2021

With the proliferation of Unmanned Aerial Vehicles (UAVs) to provide diverse critical services, such as surveillance, disaster management, and medicine delivery, the accurate detection of these small devices and the efficient classification of their...

  • Article
  • Open Access
11 Citations
4,045 Views
22 Pages

14 December 2021

Soft compression is a lossless image compression method that is committed to eliminating coding redundancy and spatial redundancy simultaneously. To do so, it adopts shapes to encode an image. In this paper, we propose a compressible indicator functi...

  • Article
  • Open Access
2 Citations
3,252 Views
9 Pages

14 December 2021

Homeostatic models of artificial neural networks have been developed to explain the self-organization of a stable dynamical connectivity between the neurons of the net. These models are typically two-population models, with excitatory and inhibitory...

  • Article
  • Open Access
7 Citations
3,267 Views
16 Pages

Minimum Query Set for Decision Tree Construction

  • Wojciech Wieczorek,
  • Jan Kozak,
  • Łukasz Strąk and
  • Arkadiusz Nowakowski

14 December 2021

A new two-stage method for the construction of a decision tree is developed. The first stage is based on the definition of a minimum query set, which is the smallest set of attribute-value pairs for which any two objects can be distinguished. To obta...

  • Article
  • Open Access
6 Citations
3,202 Views
21 Pages

The Influence of the Symmetry of Identical Particles on Flight Times

  • Salvador Miret-Artés,
  • Randall S. Dumont,
  • Tom Rivlin and
  • Eli Pollak

13 December 2021

In this work, our purpose is to show how the symmetry of identical particles can influence the time evolution of free particles in the nonrelativistic and relativistic domains as well as in the scattering by a potential δ-barrier. For this goal...

  • Review
  • Open Access
29 Citations
6,008 Views
26 Pages

13 December 2021

Measures of signal complexity, such as the Hurst exponent, the fractal dimension, and the Spectrum of Lyapunov exponents, are used in time series analysis to give estimates on persistency, anti-persistency, fluctuations and predictability of the data...

  • Article
  • Open Access
29 Citations
7,586 Views
25 Pages

13 December 2021

Classical methods for inverse problems are mainly based on regularization theory, in particular those, that are based on optimization of a criterion with two parts: a data-model matching and a regularization term. Different choices for these two term...

  • Article
  • Open Access
41 Citations
10,637 Views
35 Pages

Cryptocurrency Market Consolidation in 2020–2021

  • Jarosław Kwapień,
  • Marcin Wątorek and
  • Stanisław Drożdż

13 December 2021

Time series of price returns for 80 of the most liquid cryptocurrencies listed on Binance are investigated for the presence of detrended cross-correlations. A spectral analysis of the detrended correlation matrix and a topological analysis of the min...

  • Article
  • Open Access
7 Citations
3,487 Views
15 Pages

A Novel Adaptive Feature Fusion Strategy for Image Retrieval

  • Xiaojun Lu,
  • Libo Zhang,
  • Lei Niu,
  • Qing Chen and
  • Jianping Wang

12 December 2021

In the era of big data, it is challenging to efficiently retrieve the required images from the vast amount of data. Therefore, a content-based image retrieval system is an important research direction to address this problem. Furthermore, a multi-fea...

  • Article
  • Open Access
6 Citations
3,909 Views
14 Pages

12 December 2021

The ground state, magnetization scenario and the local bipartite quantum entanglement of a mixed spin-1/2 Ising–Heisenberg model in a magnetic field on planar lattices formed by identical corner-sharing bipyramidal plaquettes is examined by com...

  • Article
  • Open Access
4 Citations
3,352 Views
10 Pages

Quantifying the Endogeneity in Online Donations

  • Peng Wang,
  • Jinyi Li,
  • Yinjie Ma and
  • Zhiqiang Jiang

11 December 2021

Charitable crowdfunding provides a new channel for people and families suffering from unforeseen events, such as accidents, severe illness, and so on, to seek help from the public. Thus, finding the key determinants which drive the fundraising proces...

  • Article
  • Open Access
10 Citations
4,182 Views
17 Pages

11 December 2021

Congestive heart failure (CHF) is a chronic cardiovascular condition associated with dysfunction of the autonomic nervous system (ANS). Heart rate variability (HRV) has been widely used to assess ANS. This paper proposes a new HRV analysis method, wh...

  • Feature Paper
  • Article
  • Open Access
25 Citations
4,476 Views
10 Pages

10 December 2021

It is known that “quantum non locality”, leading to the violation of Bell’s inequality and more generally of classical local realism, can be attributed to the conjunction of two properties, which we call here elementary locality and...

  • Article
  • Open Access
10 Citations
3,746 Views
13 Pages

10 December 2021

An aortic dissection, a particular aortic pathology, occurs when blood pushes through a tear between the layers of the aorta and forms a so-called false lumen. Aortic dissection has a low incidence compared to other diseases, but a relatively high mo...

  • Article
  • Open Access
16 Citations
3,014 Views
23 Pages

Reliability Analysis of the New Exponential Inverted Topp–Leone Distribution with Applications

  • Ahmed Sayed M. Metwally,
  • Amal S. Hassan,
  • Ehab M. Almetwally,
  • B M Golam Kibria and
  • Hisham M. Almongy

10 December 2021

The inverted Topp–Leone distribution is a new, appealing model for reliability analysis. In this paper, a new distribution, named new exponential inverted Topp–Leone (NEITL) is presented, which adds an extra shape parameter to the inverte...

  • Article
  • Open Access
4 Citations
4,064 Views
21 Pages

Double-Layer Micro Porous Media Burner from Lean to Rich Fuel Mixture: Analysis of Entropy Generation and Exergy Efficiency

  • Nazmi Che Ismail,
  • Mohd Zulkifly Abdullah,
  • Khairil Faizi Mustafa,
  • Nurul Musfirah Mazlan,
  • Prem Gunnasegaran and
  • Agustinus Purna Irawan

10 December 2021

Porous media burner (PMB) is widely used in a variety of practical systems, including heat exchangers, gas propulsion, reactors, and radiant burner combustion. However, thorough evaluations of the performance of the PMB based on the usefulness of ent...

  • Article
  • Open Access
11 Citations
3,573 Views
21 Pages

10 December 2021

The Callan–Giddings–Harvey–Strominger black hole has a spectrum and temperature that correspond to an accelerated reflecting boundary condition in flat spacetime. The beta coefficients are identical to a moving mirror model, where t...

  • Article
  • Open Access
11 Citations
3,683 Views
25 Pages

Analytical Expressions for Ising Models on High Dimensional Lattices

  • Boris Kryzhanovsky,
  • Leonid Litinskii and
  • Vladislav Egorov

10 December 2021

We use an m-vicinity method to examine Ising models on hypercube lattices of high dimensions d3. This method is applicable for both short-range and long-range interactions. We introduce a small parameter, which determines whether the method can b...

  • Article
  • Open Access
3,339 Views
12 Pages

10 December 2021

The study of topological invariants of phase diagrams allows for the development of a qualitative theory of the processes being researched. Studies of the properties of objects in the same equivalence class may be carried out with the aim of predicti...

  • Article
  • Open Access
7 Citations
3,695 Views
17 Pages

9 December 2021

Surface electromyography (sEMG) is a valuable technique that helps provide functional and structural information about the electric activity of muscles. As sEMG measures output of complex living systems characterized by multiscale and nonlinear behav...

  • Article
  • Open Access
3 Citations
3,185 Views
14 Pages

9 December 2021

A power-water cogeneration system based on a supercritical carbon dioxide Brayton cycle (SCBC) and reverse osmosis (RO) unit is proposed and analyzed in this paper to recover the waste heat of a gas turbine. In order to improve the system performance...

  • Article
  • Open Access
9 Citations
5,637 Views
15 Pages

Privacy-Protection Scheme of a Credit-Investigation System Based on Blockchain

  • Ke Yuan,
  • Yingjie Yan,
  • Tong Xiao,
  • Wenchao Zhang,
  • Sufang Zhou and
  • Chunfu Jia

9 December 2021

In response to the rapid growth of credit-investigation data, data redundancy among credit-investigation agencies, privacy leakages of credit-investigation data subjects, and data security risks have been reported. This study proposes a privacy-prote...

  • Article
  • Open Access
21 Citations
4,148 Views
20 Pages

9 December 2021

It has recently been shown in the Eastern Mediterranean that by combining natural time analysis of seismicity with earthquake networks based on similar activity patterns and earthquake nowcasting, an estimate of the epicenter location of a future str...

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Entropy - ISSN 1099-4300