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Symmetry, Volume 12, Issue 9

2020 September - 198 articles

Cover Story: Photomechanical molecular crystals can convert light energy to mechanical energy directly with large elastic moduli, energy densities, and fast response times. The responses are the result of diverse symmetry breaking due to photoirradiation. The picture illustrates photoinduced expansion and contraction, bending, twisting, and rachet-like rotational motion. The ability of these high-symmetry structures to undergo symmetry breaking motion will continue to generate new science and new technological applications for organic crystalline materials. View this paper.
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Articles (198)

  • Article
  • Open Access
2 Citations
3,555 Views
14 Pages

Automatic Repair of Semantic Defects Using Restraint Mechanisms

  • Yukun Dong,
  • Li Zhang,
  • Shanchen Pang,
  • Wenjing Yin and ,
  • Mengying Wu,
  • Meng Wu and
  • Haojie Li
  • + 2 authors+ 0 author

22 September 2020

Recently, software, especially CPS and Internet of Things (IoT), increasingly have high requirements for quality, while program defects exist inevitably duo to the high complexity. Program defect repair faces serious challenges in that such repairs r...

(This article belongs to the Special Issue Special issue on Symmetry and Asymmetry in IoT and CPS Security and Privacy)
  • Article
  • Open Access
10 Citations
3,284 Views
14 Pages

22 September 2020

Cross-docking is a new logistics model. The location planning of the crossover center is one of the important issues in logistics management. The location of the cross-docking center is not only a technical issue, but also a management issue. This is...

(This article belongs to the Section B: Mathematics)
  • Article
  • Open Access
8 Citations
3,458 Views
13 Pages

22 September 2020

Due to the explosive development of location-based services (LBS), localization has attracted significant research attention over the past decade. Among the associated techniques, wireless fingerprint positioning has garnered much interest due to its...

(This article belongs to the Section A: Computer Science)
  • Feature Paper
  • Article
  • Open Access
48 Citations
8,671 Views
20 Pages

22 September 2020

With the spread of COVID-19, the “untact” culture in South Korea is expanding and customers are increasingly seeking for online services. A recommendation system serves as a decision-making indicator that helps users by suggesting items t...

  • Article
  • Open Access
29 Citations
5,154 Views
13 Pages

22 September 2020

Mobile robots have various applications in agriculture, autonomous cars, industrial automation, planetary exploration, security, and surveillance. The generation of the optimal smooth path is a significant aspect of mobile robotics. An optimal path f...

(This article belongs to the Section A: Computer Science)
  • Article
  • Open Access
7 Citations
3,407 Views
17 Pages

22 September 2020

Generally, simulation models are constructed to replicate and predict the behavior of real systems that currently exist or are expected to exist in the future. Once a simulation model is implemented, the model can be connected to a real system for wh...

  • Article
  • Open Access
12 Citations
3,932 Views
12 Pages

22 September 2020

Transformations, including symmetry and rotations, are important in solving mathematical problems. Meta-cognitive functions are considered critical in solving mathematical problems. In the current study, we examined prospective teachers’ use of...

(This article belongs to the Special Issue Simulation and Modelling in Natural Sciences, Economics, Biomedicine and Engineering)
  • Article
  • Open Access
88 Citations
7,047 Views
19 Pages

Enhanced Hand-Oriented Activity Recognition Based on Smartwatch Sensor Data Using LSTMs

  • Sakorn Mekruksavanich,
  • Anuchit Jitpattanakul,
  • Phichai Youplao and
  • Preecha Yupapin

22 September 2020

The creation of the Internet of Things (IoT), along with the latest developments in wearable technology, has provided new opportunities in human activity recognition (HAR). The modern smartwatch offers the potential for data from sensors to be relaye...

(This article belongs to the Section A: Computer Science)
  • Article
  • Open Access
9 Citations
10,192 Views
21 Pages

22 September 2020

Reusable launch vehicles (RLVs) are a solution for effective and economic transportation in future aerospace exploration. However, RLVs are limited to being used under simple landing conditions (small landing velocity and angle) due to their poor ada...

(This article belongs to the Special Issue Multibody Systems with Flexible Elements)
  • Article
  • Open Access
10 Citations
3,365 Views
11 Pages

22 September 2020

The variety of viscoelastic systems and structures, for the most part, is studied analytically, with significant results. As a result of analytical, numerical and experimental research, which was conducted on a larger variety of linear viscoelastic s...

(This article belongs to the Special Issue Symmetry in Dynamic Systems)
  • Article
  • Open Access
10 Citations
5,042 Views
43 Pages

22 September 2020

We provide various aspects of second rank antisymmetric Kalb–Ramond (KR) field in modified theories of gravity. The KR field energy density is found to decrease with the expansion of our universe at a faster rate in comparison to radiation and...

(This article belongs to the Special Issue Symmetry: Feature Papers 2020)
  • Article
  • Open Access
6 Citations
3,692 Views
16 Pages

22 September 2020

In this paper, we introduce a new kind of Service Level Agreement(SLA) Template to better control dynamically quality of medical monitoring platform service. Our approach is based on Health care system and Health Information Technology (HIT) research...

  • Article
  • Open Access
7 Citations
5,245 Views
25 Pages

Mitigation of Privacy Threats due to Encrypted Traffic Analysis through a Policy-Based Framework and MUD Profiles

  • Gianmarco Baldini,
  • José L. Hernandez-Ramos,
  • Slawomir Nowak,
  • Ricardo Neisse and
  • Mateusz Nowak

22 September 2020

It has been proven in research literature that the analysis of encrypted traffic with statistical analysis and machine learning can reveal the type of activities performed by a user accessing the network, thus leading to privacy risks. In particular,...

(This article belongs to the Special Issue Special issue on Symmetry and Asymmetry in IoT and CPS Security and Privacy)
  • Article
  • Open Access
8 Citations
5,979 Views
9 Pages

22 September 2020

The state of emergency caused by the covid-19 pandemic has shown that teaching at this time is not easy. Teachers have to make more use of distance education and students have to adapt to that. Classic face-to-face study is not possible but asymmetri...

(This article belongs to the Special Issue Simulation and Modelling in Natural Sciences, Economics, Biomedicine and Engineering)
  • Article
  • Open Access
6 Citations
8,510 Views
13 Pages

Nematic and Smectic Phases: Dynamics and Phase Transition

  • Aurélien Bailly-Reyre and
  • Hung T. Diep

22 September 2020

We study in this paper the dynamics of molecules leading to the formation of nematic and smectic phases using a mobile 6-state Potts spin model with Monte Carlo simulation. Each Potts state represents a molecular orientation. We show that, with the c...

(This article belongs to the Special Issue Symmetry and Symmetry Breaking: Phase Transitions and Critical Phenomena)
  • Feature Paper
  • Article
  • Open Access
1 Citations
3,519 Views
18 Pages

22 September 2020

The natural transformation constitutes one of the most important entity of category theory and it introduces a piece of sophisticated dynamism to the categorial structures. Each natural transformation forms a unique mapping between the so-called func...

(This article belongs to the Special Issue Fuzzy Mathematics Applied to Science, Engineering and Sustainability Issues)
  • Article
  • Open Access
9 Citations
3,382 Views
12 Pages

An Efficient Network Resource Management in SDN for Cloud Services

  • Myunghoon Jeon,
  • Namgi Kim,
  • Yehoon Jang and
  • Byoung-Dai Lee

21 September 2020

With the recent advancements in cloud computing technology, the number of cloud-based services has been gradually increasing. Symmetrically, users are asking for quality of experience (QoE) to be maintained or improved. To do this, it has become nece...

(This article belongs to the Section A: Computer Science)
  • Article
  • Open Access
3 Citations
2,490 Views
20 Pages

On Product of Smooth Neutrosophic Topological Spaces

  • Kalaivani Chandran,
  • Swathi Sundari Sundaramoorthy,
  • Florentin Smarandache and
  • Saeid Jafari

21 September 2020

In this paper, we develop the notion of the basis for a smooth neutrosophic topology in a more natural way. As a sequel, we define the notion of symmetric neutrosophic quasi-coincident neighborhood systems and prove some interesting results that fit...

(This article belongs to the Section B: Mathematics)
  • Article
  • Open Access
5 Citations
3,467 Views
19 Pages

Stuck Knots

  • Khaled Bataineh

21 September 2020

Singular knots and links have projections involving some usual crossings and some four-valent rigid vertices. Such vertices are symmetric in the sense that no strand overpasses the other. In this research we introduce stuck knots and links to represe...

  • Article
  • Open Access
7 Citations
4,228 Views
17 Pages

21 September 2020

The present study reports a reconstruction scheme for f(R) gravity with the scale factor a(t)∝(t*−t)2c2 describing the pre-bounce ekpyrotic contraction, where t* is the big crunch time. The reconstructed f(R) is used to derive expressions...

(This article belongs to the Section C: Physics)
  • Article
  • Open Access
3 Citations
2,882 Views
12 Pages

Exact Solutions and Continuous Numerical Approximations of Coupled Systems of Diffusion Equations with Delay

  • Elia Reyes,
  • M. Ángeles Castro,
  • Antonio Sirvent and
  • Francisco Rodríguez

21 September 2020

In this work, we obtain exact solutions and continuous numerical approximations for mixed problems of coupled systems of diffusion equations with delay. Using the method of separation of variables, and based on an explicit expression for the solution...

(This article belongs to the Special Issue Ordinary and Partial Differential Equations: Theory and Applications)
  • Article
  • Open Access
23 Citations
4,419 Views
18 Pages

21 September 2020

Sometimes it is very difficult to obtain high-quality images because of the limitations of image-capturing devices and the environment. Gamma correction (GC) is widely used for image enhancement. However, traditional GC perhaps cannot preserve image...

(This article belongs to the Section A: Computer Science)
  • Article
  • Open Access
2 Citations
3,733 Views
19 Pages

Graph Learning-Based Ontology Sparse Vector Computing

  • Jianzhang Wu,
  • Arun Kumar Sangaiah and
  • Wei Gao

21 September 2020

The ontology sparse vector learning algorithm is essentially a dimensionality reduction trick, i.e., the key components in the p-dimensional vector are taken out, and the remaining components are set to zero, so as to obtain the key information in a...

(This article belongs to the Special Issue Fuzzy Mathematics Applied to Science, Engineering and Sustainability Issues)
  • Article
  • Open Access
  • Best Paper Award
466 Citations
19,149 Views
56 Pages

20 September 2020

Multi-Criteria Decision-Analysis (MCDA) methods are successfully applied in different fields and disciplines. However, in many studies, the problem of selecting the proper methods and parameters for the decision problems is raised. The paper undertak...

(This article belongs to the Special Issue Uncertain Multi-Criteria Optimization Problems)
  • Article
  • Open Access
6 Citations
2,756 Views
6 Pages

20 September 2020

Scators form a vector space endowed with a non-distributive product, in the hyperbolic case, have physical applications related to some deformations of special relativity (breaking the Lorentz symmetry) while the elliptic case leads to new examples o...

(This article belongs to the Special Issue Symmetry in Geometric Functions and Mathematical Analysis)
  • Article
  • Open Access
59 Citations
5,402 Views
35 Pages

20 September 2020

Many scientific papers are devoted to solving multi-criteria problems. Researchers solve these problems, usually using methods that find discrete solutions and with the collaboration of domain experts. In both symmetrical and asymmetrical problems, t...

(This article belongs to the Special Issue Uncertain Multi-Criteria Optimization Problems)
  • Article
  • Open Access
9 Citations
5,302 Views
18 Pages

20 September 2020

The traffic block port monitors and manages the road traffic by shooting and recording the motor vehicles. However, due to the complex factors such as shooting angle, light condition, environmental background, etc., the recognition rate of license pl...

(This article belongs to the Section A: Computer Science)
  • Article
  • Open Access
20 Citations
8,117 Views
18 Pages

20 September 2020

Exchange rate forecasting has been an important topic for investors, researchers, and analysts. In this study, financial sentiment analysis (FSA) and time series analysis (TSA) are proposed to form a predicting model for US Dollar/Turkish Lira exchan...

(This article belongs to the Section A: Computer Science)
  • Article
  • Open Access
14 Citations
3,520 Views
7 Pages

20 September 2020

Following the idea of T. Wongyat and W. Sintunavarat, we obtain some existence and uniqueness results for the solution of an integral equation with supremum. The paper ends with the study of Gronwall-type theorems, comparison theorems and a result re...

(This article belongs to the Special Issue Fixed Point Theory and Computational Analysis with Applications)
  • Article
  • Open Access
7 Citations
3,936 Views
25 Pages

Parallel Hybrid Testing Techniques for the Dual-Programming Models-Based Programs

  • Ahmed Mohammed Alghamdi,
  • Fathy Elbouraey Eassa,
  • Maher Ali Khamakhem,
  • Abdullah Saad AL-Malaise AL-Ghamdi and ,
  • Ahmed S. Alfakeeh,
  • Abdullah S. Alshahrani and
  • Ala A. Alarood
  • + 2 authors+ 0 author

20 September 2020

The importance of high-performance computing is increasing, and Exascale systems will be feasible in a few years. These systems can be achieved by enhancing the hardware’s ability as well as the parallelism in the application by integrating mor...

(This article belongs to the Section A: Computer Science)
  • Feature Paper
  • Article
  • Open Access
6 Citations
2,361 Views
17 Pages

19 September 2020

A geometrical formulation for adjoint-symmetries as one-forms is studied for general partial differential equations (PDEs), which provides a dual counterpart of the geometrical meaning of symmetries as tangent vector fields on the solution space of a...

(This article belongs to the Special Issue Geometric Analysis of Nonlinear Partial Differential Equations)
  • Article
  • Open Access
11 Citations
4,469 Views
32 Pages

Fuzzy Goal Programming with an Imprecise Intuitionistic Fuzzy Preference Relations

  • Abdul Razzaq Abdul Ghaffar,
  • Md. Gulzarul Hasan,
  • Zubair Ashraf and
  • Mohammad Faisal Khan

19 September 2020

Fuzzy goal programming (FGP) is applied to solve fuzzy multi-objective optimization problems. In FGP, the weights are associated with fuzzy goals for the preference among them. However, the hierarchy within the fuzzy goals depends on several uncertai...

(This article belongs to the Section B: Mathematics)
  • Article
  • Open Access
41 Citations
3,294 Views
19 Pages

18 September 2020

A significant challenge in the current trend in decision-making methods is the problem’s class in which the decision-maker makes decisions based on partially incomplete data. Classic methods of multicriteria decision analysis are used to analyz...

(This article belongs to the Special Issue Multi-Criteria Decision Aid methods in fuzzy decision problems – part II)
  • Article
  • Open Access
2 Citations
2,642 Views
13 Pages

18 September 2020

Generally, the linear topological spaces successfully generate Tychonoff product topology in lower dimensions. This paper proposes the construction and analysis of a multidimensional topological space based on the Cartesian product of complex and rea...

  • Feature Paper
  • Article
  • Open Access
25 Citations
3,337 Views
36 Pages

Multifluid Modelling of Relativistic Radiation Hydrodynamics

  • Lorenzo Gavassino,
  • Marco Antonelli and
  • Brynmor Haskell

18 September 2020

The formulation of a universal theory for bulk viscosity and heat conduction represents a theoretical challenge for our understanding of relativistic fluid dynamics. Recently, it was shown that the multifluid variational approach championed by Carter...

(This article belongs to the Special Issue Numerical Relativity and Gravitational Wave)
  • Article
  • Open Access
24 Citations
5,607 Views
21 Pages

Theory-Based Model and Prediction Analysis of Information Security Compliance Behavior in the Saudi Healthcare Sector

  • Sultan T. Alanazi,
  • Mohammed Anbar,
  • Shouki A. Ebad,
  • Shankar Karuppayah and
  • Hadeer A. Al-Ani

18 September 2020

The adoption of health information systems provides many potential healthcare benefits. The government of the Kingdom of Saudi Arabia has subsidized this field. However, like those of other less developed countries, organizations in the Kingdom of Sa...

(This article belongs to the Section A: Computer Science)
  • Article
  • Open Access
6 Citations
4,526 Views
14 Pages

18 September 2020

Seventeen singlet excited states of ethylene have been calculated via time-dependent density functional theory (TDDFT) with the CAM-B3LYP functional and the geometries of 11 excited states were optimized successfully. The local vibrational mode theor...

(This article belongs to the Special Issue Symmetry and Molecular Spectroscopy)
  • Article
  • Open Access
2 Citations
2,680 Views
19 Pages

18 September 2020

A continuum model for tumor invasion in a two-dimensional spatial domain based on the interaction of the urokinase plasminogen activation system with a model for cancer cell dynamics is proposed. The arising system of partial differential equations i...

(This article belongs to the Special Issue Ordinary and Partial Differential Equations: Theory and Applications)
  • Article
  • Open Access
5 Citations
2,512 Views
17 Pages

A Dynamic Failure Time Degradation-Based Model

  • Abdulhakim A. Albabtain,
  • Mansour Shrahili,
  • Lolwa Alshagrawi and
  • Mohamed Kayid

17 September 2020

A novel methodology for modelling time to failure of systems under a degradation process is proposed. Considering the method degradation may have influenced the failure of the system under the setup of the model several implied lifetime distributions...

(This article belongs to the Section A: Computer Science)
  • Article
  • Open Access
8 Citations
25,292 Views
8 Pages

17 September 2020

We provide a natural derivation and interpretation for the uncertainty principle in quantum mechanics from the stochastic optimal control approach. We show that, in particular, the stochastic approach to quantum mechanics allows one to understand the...

(This article belongs to the Special Issue Symmetries in Quantum Mechanics)
  • Article
  • Open Access
2 Citations
6,242 Views
24 Pages

17 September 2020

Cold dark-matter, as a solution to the so-called dark-matter problem, suffers from a major internal conflict: In order to dodge direct detection for so long, it must have an unobservably small (non gravitational) interaction with mundane matter, and...

(This article belongs to the Special Issue Nature and Origin of Dark Matter and Dark Energy)
  • Article
  • Open Access
6 Citations
3,177 Views
16 Pages

Predicting Perceptual Quality in Internet Television Based on Unsupervised Learning

  • Jaroslav Frnda,
  • Jan Nedoma,
  • Radek Martinek and
  • Michael Fridrich

17 September 2020

Quality of service (QoS) and quality of experience (QoE) are two major concepts for the quality evaluation of video services. QoS analyzes the technical performance of a network transmission chain (e.g., utilization or packet loss rate). On the other...

(This article belongs to the Special Issue Symmetry in Artificial Visual Perception and Its Application)
  • Article
  • Open Access
36 Citations
15,625 Views
25 Pages

Affective and Stress Consequences of Cyberbullying

  • Ashraf Alhujailli,
  • Waldemar Karwowski,
  • Thomas T.H. Wan and
  • Peter Hancock

17 September 2020

The primary objective of this study was to investigate the effects of cyberbullying through social exclusion and verbal harassment on emotional, stress, and coping responses. Twenty-nine undergraduate students (16 females aged 18.25 ± 0.58 yea...

(This article belongs to the Section A: Computer Science)
  • Article
  • Open Access
2 Citations
2,529 Views
13 Pages

17 September 2020

In this paper, we mainly count the number of subgroup chains of a finite nilpotent group. We derive a recursive formula that reduces the counting problem to that of finite p-groups. As applications of our main result, the classification problem of di...

(This article belongs to the Section B: Mathematics)
  • Article
  • Open Access
19 Citations
4,641 Views
18 Pages

17 September 2020

Multivariate statistical methods are widely used in several disciplines of fundamental sciences. In the present study, the data analysis of the chemical analysis of the sands of Moonlight Beach in the Kemer region was examined using multivariate stat...

(This article belongs to the Special Issue Recent Advances in Number Theory and Their Applications)
  • Article
  • Open Access
7 Citations
3,076 Views
18 Pages

17 September 2020

We study the solvability of nonlinear inverse problems of determining the low order coefficients in the second order hyperbolic equation. The overdetermination condition is specified as an integral condition with final data. Existence and uniqueness...

(This article belongs to the Special Issue Ordinary and Partial Differential Equations: Theory and Applications)
  • Article
  • Open Access
15 Citations
3,510 Views
14 Pages

Distance Fibonacci Polynomials

  • Urszula Bednarz and
  • Małgorzata Wołowiec-Musiał

17 September 2020

In this paper, we introduce a new kind of generalized Fibonacci polynomials in the distance sense. We give a direct formula, a generating function and matrix generators for these polynomials. Moreover, we present a graph interpretation of these polyn...

(This article belongs to the Section B: Mathematics)
  • Communication
  • Open Access
10 Citations
4,035 Views
7 Pages

16 September 2020

Rate of force/torque development scaling factor (RFD-SF/RTD-SF) was recently introduced as a tool to quantify the neuromuscular quickness, and it could have potential for interlimb asymmetry identification. Moreover, positive relationships in RFD-SF...

(This article belongs to the Special Issue Symmetry and Biomechanics)
  • Article
  • Open Access
2,156 Views
7 Pages

16 September 2020

Up to now, it is unknown an existence of blow up solutions in the Cauchy problem for Navier–Stokes equations in space. The first important property of hypothetical blow up solutions was found by J. Leray in 1934. It is connected with norms in L...

(This article belongs to the Section B: Mathematics)
  • Article
  • Open Access
20 Citations
3,276 Views
14 Pages

16 September 2020

The water around thenear-sea tunnels is supplied infinitely, and mechanical characteristics of the lining and movement joint are inevitably affected by waterproof methods. The research on the mechanical characteristics of the waterproof system is imm...

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Symmetry - ISSN 2073-8994