Subjects -> COMPUTER SCIENCE (Total: 2313 journals)
    - ANIMATION AND SIMULATION (33 journals)
    - ARTIFICIAL INTELLIGENCE (133 journals)
    - AUTOMATION AND ROBOTICS (116 journals)
    - CLOUD COMPUTING AND NETWORKS (75 journals)
    - COMPUTER ARCHITECTURE (11 journals)
    - COMPUTER ENGINEERING (12 journals)
    - COMPUTER GAMES (23 journals)
    - COMPUTER PROGRAMMING (25 journals)
    - COMPUTER SCIENCE (1305 journals)
    - COMPUTER SECURITY (59 journals)
    - DATA BASE MANAGEMENT (21 journals)
    - DATA MINING (50 journals)
    - E-BUSINESS (21 journals)
    - E-LEARNING (30 journals)
    - ELECTRONIC DATA PROCESSING (23 journals)
    - IMAGE AND VIDEO PROCESSING (42 journals)
    - INFORMATION SYSTEMS (109 journals)
    - INTERNET (111 journals)
    - SOCIAL WEB (61 journals)
    - SOFTWARE (43 journals)
    - THEORY OF COMPUTING (10 journals)

COMPUTER SCIENCE (1305 journals)                  1 2 3 4 5 6 7 | Last

Showing 1 - 200 of 872 Journals sorted alphabetically
3D Printing and Additive Manufacturing     Full-text available via subscription   (Followers: 27)
Abakós     Open Access   (Followers: 3)
ACM Computing Surveys     Hybrid Journal   (Followers: 29)
ACM Inroads     Full-text available via subscription   (Followers: 1)
ACM Journal of Computer Documentation     Free   (Followers: 4)
ACM Journal on Computing and Cultural Heritage     Hybrid Journal   (Followers: 5)
ACM Journal on Emerging Technologies in Computing Systems     Hybrid Journal   (Followers: 11)
ACM SIGACCESS Accessibility and Computing     Free   (Followers: 2)
ACM SIGAPP Applied Computing Review     Full-text available via subscription  
ACM SIGBioinformatics Record     Full-text available via subscription  
ACM SIGEVOlution     Full-text available via subscription  
ACM SIGHIT Record     Full-text available via subscription  
ACM SIGHPC Connect     Full-text available via subscription  
ACM SIGITE Newsletter     Open Access   (Followers: 1)
ACM SIGMIS Database: the DATABASE for Advances in Information Systems     Hybrid Journal  
ACM SIGUCCS plugged in     Full-text available via subscription  
ACM SIGWEB Newsletter     Full-text available via subscription   (Followers: 4)
ACM Transactions on Accessible Computing (TACCESS)     Hybrid Journal   (Followers: 3)
ACM Transactions on Algorithms (TALG)     Hybrid Journal   (Followers: 13)
ACM Transactions on Applied Perception (TAP)     Hybrid Journal   (Followers: 3)
ACM Transactions on Architecture and Code Optimization (TACO)     Hybrid Journal   (Followers: 9)
ACM Transactions on Asian and Low-Resource Language Information Processing (TALLIP)     Hybrid Journal  
ACM Transactions on Autonomous and Adaptive Systems (TAAS)     Hybrid Journal   (Followers: 10)
ACM Transactions on Computation Theory (TOCT)     Hybrid Journal   (Followers: 11)
ACM Transactions on Computational Logic (TOCL)     Hybrid Journal   (Followers: 5)
ACM Transactions on Computer Systems (TOCS)     Hybrid Journal   (Followers: 19)
ACM Transactions on Computer-Human Interaction     Hybrid Journal   (Followers: 15)
ACM Transactions on Computing Education (TOCE)     Hybrid Journal   (Followers: 9)
ACM Transactions on Computing for Healthcare     Hybrid Journal  
ACM Transactions on Cyber-Physical Systems (TCPS)     Hybrid Journal   (Followers: 1)
ACM Transactions on Design Automation of Electronic Systems (TODAES)     Hybrid Journal   (Followers: 5)
ACM Transactions on Economics and Computation     Hybrid Journal  
ACM Transactions on Embedded Computing Systems (TECS)     Hybrid Journal   (Followers: 4)
ACM Transactions on Information Systems (TOIS)     Hybrid Journal   (Followers: 18)
ACM Transactions on Intelligent Systems and Technology (TIST)     Hybrid Journal   (Followers: 11)
ACM Transactions on Interactive Intelligent Systems (TiiS)     Hybrid Journal   (Followers: 6)
ACM Transactions on Internet of Things     Hybrid Journal   (Followers: 2)
ACM Transactions on Modeling and Performance Evaluation of Computing Systems (ToMPECS)     Hybrid Journal  
ACM Transactions on Multimedia Computing, Communications, and Applications (TOMCCAP)     Hybrid Journal   (Followers: 10)
ACM Transactions on Parallel Computing     Full-text available via subscription  
ACM Transactions on Reconfigurable Technology and Systems (TRETS)     Hybrid Journal   (Followers: 6)
ACM Transactions on Sensor Networks (TOSN)     Hybrid Journal   (Followers: 9)
ACM Transactions on Social Computing     Hybrid Journal  
ACM Transactions on Spatial Algorithms and Systems (TSAS)     Hybrid Journal   (Followers: 1)
ACM Transactions on Speech and Language Processing (TSLP)     Hybrid Journal   (Followers: 11)
ACM Transactions on Storage     Hybrid Journal  
ACS Applied Materials & Interfaces     Hybrid Journal   (Followers: 39)
Acta Informatica Malaysia     Open Access  
Acta Universitatis Cibiniensis. Technical Series     Open Access   (Followers: 1)
Ad Hoc Networks     Hybrid Journal   (Followers: 12)
Adaptive Behavior     Hybrid Journal   (Followers: 8)
Additive Manufacturing Letters     Open Access   (Followers: 3)
Advanced Engineering Materials     Hybrid Journal   (Followers: 32)
Advanced Science Letters     Full-text available via subscription   (Followers: 9)
Advances in Adaptive Data Analysis     Hybrid Journal   (Followers: 9)
Advances in Artificial Intelligence     Open Access   (Followers: 31)
Advances in Catalysis     Full-text available via subscription   (Followers: 7)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 20)
Advances in Computer Engineering     Open Access   (Followers: 13)
Advances in Computer Science : an International Journal     Open Access   (Followers: 18)
Advances in Computing     Open Access   (Followers: 3)
Advances in Data Analysis and Classification     Hybrid Journal   (Followers: 52)
Advances in Engineering Software     Hybrid Journal   (Followers: 26)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 19)
Advances in Human-Computer Interaction     Open Access   (Followers: 19)
Advances in Image and Video Processing     Open Access   (Followers: 20)
Advances in Materials Science     Open Access   (Followers: 19)
Advances in Multimedia     Open Access   (Followers: 1)
Advances in Operations Research     Open Access   (Followers: 13)
Advances in Remote Sensing     Open Access   (Followers: 59)
Advances in Science and Research (ASR)     Open Access   (Followers: 8)
Advances in Technology Innovation     Open Access   (Followers: 5)
AEU - International Journal of Electronics and Communications     Hybrid Journal   (Followers: 8)
African Journal of Information and Communication     Open Access   (Followers: 6)
African Journal of Mathematics and Computer Science Research     Open Access   (Followers: 5)
AI EDAM     Hybrid Journal   (Followers: 2)
Air, Soil & Water Research     Open Access   (Followers: 6)
AIS Transactions on Human-Computer Interaction     Open Access   (Followers: 5)
Al-Qadisiyah Journal for Computer Science and Mathematics     Open Access   (Followers: 2)
AL-Rafidain Journal of Computer Sciences and Mathematics     Open Access   (Followers: 3)
Algebras and Representation Theory     Hybrid Journal  
Algorithms     Open Access   (Followers: 13)
American Journal of Computational and Applied Mathematics     Open Access   (Followers: 8)
American Journal of Computational Mathematics     Open Access   (Followers: 6)
American Journal of Information Systems     Open Access   (Followers: 4)
American Journal of Sensor Technology     Open Access   (Followers: 2)
Analog Integrated Circuits and Signal Processing     Hybrid Journal   (Followers: 15)
Animation Practice, Process & Production     Hybrid Journal   (Followers: 4)
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Data Science     Hybrid Journal   (Followers: 14)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 16)
Annals of Pure and Applied Logic     Open Access   (Followers: 4)
Annals of Software Engineering     Hybrid Journal   (Followers: 12)
Annual Reviews in Control     Hybrid Journal   (Followers: 7)
Anuario Americanista Europeo     Open Access  
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 3)
Applied and Computational Harmonic Analysis     Full-text available via subscription  
Applied Artificial Intelligence: An International Journal     Hybrid Journal   (Followers: 17)
Applied Categorical Structures     Hybrid Journal   (Followers: 4)
Applied Clinical Informatics     Hybrid Journal   (Followers: 4)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 16)
Applied Computer Systems     Open Access   (Followers: 6)
Applied Computing and Geosciences     Open Access   (Followers: 3)
Applied Mathematics and Computation     Hybrid Journal   (Followers: 31)
Applied Medical Informatics     Open Access   (Followers: 11)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 4)
Applied Soft Computing     Hybrid Journal   (Followers: 13)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 5)
Applied System Innovation     Open Access   (Followers: 1)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 4)
Archive of Numerical Software     Open Access  
Archives and Museum Informatics     Hybrid Journal   (Followers: 97)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 5)
arq: Architectural Research Quarterly     Hybrid Journal   (Followers: 7)
Array     Open Access   (Followers: 1)
Artifact : Journal of Design Practice     Open Access   (Followers: 8)
Artificial Life     Hybrid Journal   (Followers: 7)
Asian Journal of Computer Science and Information Technology     Open Access   (Followers: 3)
Asian Journal of Control     Hybrid Journal  
Asian Journal of Research in Computer Science     Open Access   (Followers: 4)
Assembly Automation     Hybrid Journal   (Followers: 2)
Automatic Control and Computer Sciences     Hybrid Journal   (Followers: 6)
Automatic Documentation and Mathematical Linguistics     Hybrid Journal   (Followers: 5)
Automatica     Hybrid Journal   (Followers: 13)
Automatika : Journal for Control, Measurement, Electronics, Computing and Communications     Open Access  
Automation in Construction     Hybrid Journal   (Followers: 8)
Balkan Journal of Electrical and Computer Engineering     Open Access  
Basin Research     Hybrid Journal   (Followers: 7)
Behaviour & Information Technology     Hybrid Journal   (Followers: 32)
BenchCouncil Transactions on Benchmarks, Standards, and Evaluations     Open Access   (Followers: 4)
Big Data and Cognitive Computing     Open Access   (Followers: 5)
Big Data Mining and Analytics     Open Access   (Followers: 10)
Biodiversity Information Science and Standards     Open Access   (Followers: 1)
Bioinformatics     Hybrid Journal   (Followers: 216)
Bioinformatics Advances : Journal of the International Society for Computational Biology     Open Access   (Followers: 1)
Biomedical Engineering     Hybrid Journal   (Followers: 11)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 11)
Briefings in Bioinformatics     Hybrid Journal   (Followers: 43)
British Journal of Educational Technology     Hybrid Journal   (Followers: 93)
Bulletin of Taras Shevchenko National University of Kyiv. Series: Physics and Mathematics     Open Access  
c't Magazin fuer Computertechnik     Full-text available via subscription   (Followers: 1)
Cadernos do IME : Série Informática     Open Access  
CALCOLO     Hybrid Journal  
CALICO Journal     Full-text available via subscription   (Followers: 1)
Calphad     Hybrid Journal  
Canadian Journal of Electrical and Computer Engineering     Full-text available via subscription   (Followers: 14)
Catalysis in Industry     Hybrid Journal  
CCF Transactions on High Performance Computing     Hybrid Journal  
CCF Transactions on Pervasive Computing and Interaction     Hybrid Journal  
CEAS Space Journal     Hybrid Journal   (Followers: 6)
Cell Communication and Signaling     Open Access   (Followers: 3)
Central European Journal of Computer Science     Hybrid Journal   (Followers: 4)
CERN IdeaSquare Journal of Experimental Innovation     Open Access  
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 1)
Chaos, Solitons & Fractals : X     Open Access   (Followers: 1)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 13)
ChemSusChem     Hybrid Journal   (Followers: 7)
China Communications     Full-text available via subscription   (Followers: 8)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
Chip     Full-text available via subscription   (Followers: 3)
Ciencia     Open Access  
CIN : Computers Informatics Nursing     Hybrid Journal   (Followers: 11)
Circuits and Systems     Open Access   (Followers: 16)
CLEI Electronic Journal     Open Access  
Clin-Alert     Hybrid Journal   (Followers: 1)
Clinical eHealth     Open Access  
Cluster Computing     Hybrid Journal   (Followers: 1)
Cognitive Computation     Hybrid Journal   (Followers: 2)
Cognitive Computation and Systems     Open Access  
COMBINATORICA     Hybrid Journal  
Combinatorics, Probability and Computing     Hybrid Journal   (Followers: 4)
Combustion Theory and Modelling     Hybrid Journal   (Followers: 18)
Communication Methods and Measures     Hybrid Journal   (Followers: 12)
Communication Theory     Hybrid Journal   (Followers: 29)
Communications in Algebra     Hybrid Journal   (Followers: 1)
Communications in Partial Differential Equations     Hybrid Journal   (Followers: 2)
Communications of the ACM     Full-text available via subscription   (Followers: 59)
Communications of the Association for Information Systems     Open Access   (Followers: 15)
Communications on Applied Mathematics and Computation     Hybrid Journal   (Followers: 1)
COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering     Hybrid Journal   (Followers: 4)
Complex & Intelligent Systems     Open Access   (Followers: 1)
Complex Adaptive Systems Modeling     Open Access  
Complex Analysis and Operator Theory     Hybrid Journal   (Followers: 2)
Complexity     Hybrid Journal   (Followers: 8)
Computación y Sistemas     Open Access  
Computation     Open Access   (Followers: 1)
Computational and Applied Mathematics     Hybrid Journal   (Followers: 3)
Computational and Mathematical Methods     Hybrid Journal  
Computational and Mathematical Methods in Medicine     Open Access   (Followers: 2)
Computational and Mathematical Organization Theory     Hybrid Journal   (Followers: 1)
Computational and Structural Biotechnology Journal     Open Access   (Followers: 1)
Computational and Theoretical Chemistry     Hybrid Journal   (Followers: 11)
Computational Astrophysics and Cosmology     Open Access   (Followers: 6)
Computational Biology and Chemistry     Hybrid Journal   (Followers: 13)
Computational Biology Journal     Open Access   (Followers: 6)
Computational Brain & Behavior     Hybrid Journal   (Followers: 1)
Computational Chemistry     Open Access   (Followers: 3)
Computational Communication Research     Open Access   (Followers: 1)
Computational Complexity     Hybrid Journal   (Followers: 5)
Computational Condensed Matter     Open Access   (Followers: 1)

        1 2 3 4 5 6 7 | Last

Similar Journals
Journal Cover
Computational and Applied Mathematics
Journal Prestige (SJR): 0.272
Citation Impact (citeScore): 1
Number of Followers: 3  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 0101-8205 - ISSN (Online) 1807-0302
Published by Springer-Verlag Homepage  [2469 journals]
  • Bifurcation analysis of an intraguild predator-prey model

    • Free pre-print version: Loading...

      Abstract: Abstract This paper deals with a predator-prey model and a modified version consisting of a resource-consumer with two consumer species. We analyze the stability of equilibria and for the interior equilibrium, we show that the system undergoes some generic bifurcations such as fold, Hopf and Hopf-zero bifurcations. We characterize these bifurcations by the center manifold theorem and the normal form theory. We further compute the critical normal form coefficients of the reduced system to the center manifold and conclude the non-degeneracy conditions for the computed bifurcations. By using the numerical continuation method, we compute several bifurcation curves emanating from the detected bifurcation points to examine the obtained analytical results as well as to reveal further complex dynamical behaviors of the system which can not be achieved analytically. Especially for both the original and modified models on the Hopf bifurcation curve, we detect some codimension two bifurcations namely Hopf-zero and generalized Hopf.
      PubDate: 2022-05-22
       
  • A meshfree technique for the numerical solutions of nonlinear
           Fornberg–Whitham and Degasperis–Procesi equations with their modified
           forms

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      Abstract: Abstract An efficient and robust hybrid scheme based on radial basis functions (RBFs) and finite difference is implemented to solve nonlinear partial differential equations (PDEs). In the proposed method, first-order finite difference and the \(\theta \) -weighted scheme are coupled for temporal discretization, while RBFs are used for spatial discretization. The key feature of the scheme is to use quasilinearization with a collocation approach to reduce nonlinear PDEs to linear algebraic system of equations which are easy to solve. Stability analysis is carried out to examine the spectral radius of the amplification matrix versus the shape parameter. Furthermore, the scheme is applied to solve some nonlinear PDEs including Fornberg–Whitham, Degasperis–Procesi equations, and their modified forms. Efficiency of the proposed technique is demonstrated via different error norms and conservative quantities. Moreover, the computed results are compared with the existing results in the literature. Simulations reveal better accuracy for the considered problems.
      PubDate: 2022-05-19
       
  • Numerical and theoretical approximation results for Schurer–Stancu
           operators with shape parameter $$ \lambda $$ λ

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      Abstract: Abstract In this paper, we focus on pointwise and weighted approximation properties of newly defined Stancu variant of \( \lambda \) -Schurer operators. We establish a direct local approximation theorem and obtain a global approximation formula. These newly defined operators reduce to classical Schurer, Bernstein, Stancu, \( \lambda \) -Bernstein, \( \lambda \) -Stancu, \( \lambda \) -Schurer operators for the special cases of parameters. Certain illustrative and numerical examples are given to verify the convergence behavior and accuracy of the proposed operators. The numerical evaluations that obtained in this study may facilitate understanding and interpreting main results of this paper for the reader.
      PubDate: 2022-05-17
       
  • Applications of generalized fixed points theorems to the existence of
           uncertainly hyperbolic partial differential equations with finite delay

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      Abstract: Abstract We study the existence and uniqueness of solutions for a boundary value problem associated with a class of fuzzy hyperbolic partial differential equations with finite delay. We establish a more general definition of integral solutions for the boundary value problem and, using some results of fixed point of weakly contractive mappings on partially ordered metric spaces, we prove that the existence of just a lower or an upper solution is enough to prove the existence and uniqueness of fuzzy solutions in the setting of a generalized Hukuhara derivative. Our existence results generalize, extend, and improve different results existing in the literature about this problem.
      PubDate: 2022-05-17
       
  • Improving the space-filling behavior of multiple triple designs

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      Abstract: Abstract A space-filling (SF) design gives a good representation of experimental region with even fewer points by selecting its points everywhere in the region with as few gaps as possible. Elsawah (J Comput Appl Math 384:113164, 2021) presented the multiple tripling (MT) technique for constructing a new class of three-level designs, called multiple triple designs (MTDs). The MT technique showed its superiority over the widely used techniques by constructing new large optimal MTDs in an efficient manner using small initial designs (InDs). This paper gives a closer look at the SF behavior of MTDs after all of its factor projections and level permutations (FPs-LPs) that alter their statistical inference abilities. The selection of optimal designs by FPs-LPs of such large MTDs needs millions of trials to test all the possible cases. This paper tries to solve this hard computational problem by building theoretical bridges between the SF behavior of the MTD after all of its FPs-LPs and the behavior of the corresponding InD, which is investigated based on the similarity among its runs, confounding among its factors, and uniformity of its points. This study provides benchmarks to guide the experimenters before using FPs-LPs for improving the SF behavior of MTDs in the full dimension and any low dimension. Moreover, the construction of non-isomorphic MTDs is discussed and a lower bound of the number of non-isomorphic MTDs is given. Finally, numerical studies to support the interesting theoretical findings are provided.
      PubDate: 2022-05-17
       
  • On the second order of accuracy stable difference scheme for integral type
           non-local elliptic source identification problem

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      Abstract: Abstract In this study, a source identification problem for elliptic differential equation with integral type non-local condition is discussed. The second order of accuracy difference scheme for elliptic non-local source identification problem is studied. Using spectral resolution of a self-adjoint operator, stability and coercive stability estimates for solution of difference scheme are established. Subsequently, difference scheme for an approximate solution of multi-dimensional boundary-value problem with integral type non-local and first kind boundary conditions is investigated for stability. Numerical results for 2D and 3D examples are illustrated.
      PubDate: 2022-05-16
       
  • An effective algorithm for mean curvature-based image deblurring problem

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      Abstract: Abstract The mean curvature-based image deblurring model is widely used in image restoration to preserve edges and remove staircase effect in the resulting images. However, the Euler–Lagrange equations of the mean curvature model lead to the challenging problem of solving a nonlinear fourth order integro-differential equation. Furthermore the discretization of the Euler–Lagrange equations produces a nonlinear ill-conditioned system which affects the convergence of the numerical algorithms such as Krylov subspace methods (GMRES, etc.) In this paper, we have treated the high order nonlinearity by converting the nonlinear fourth order integro-differential equation into a system of first order equations. To speed up convergence by GMRES method, we have introduced a new circulant preconditioned matrix. Fast convergence is assured by the proved analytical property of our proposed new preconditioner. The first order error estimates are also established for the finite difference discretization. The effectiveness of our algorithm can be observed through fast convergence rates in numerical examples.
      PubDate: 2022-05-16
       
  • Abundant accurate solitonic water and ionic liquid wave structures of the
           nanoparticle hybrid system

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      Abstract: Abstract This study gives more attention to soliton wave solutions of the nanoparticle hybrid system through two recent (generalized rational (GRat) and Kudryashov (GKud)) schemes. Because of the hybrid model’s nanoscale size, the nanoparticles in these new solitonic liquid wave structures exhibit unique electrical and optical characteristics crucial to several applications. The constructed results are numerically simulated in polar, contour, two, and three-dimensional graphs to demonstrate the dynamic behavior of an inviscid, incompressible, and non-rotating flow of fluid of constant depth h. Moreover, the obtained solutions’ accuracy is also checked by implementing two precise numerical (quintic-B-spline (QBS) and septic-B-spline (SBS)) schemes. The matching between computational and approximate solutions is explained through some distinct graphs in two-dimensional and distribution graphs. The novelty of our results is also elucidated by comparing our results with those constructed previously.
      PubDate: 2022-05-16
       
  • A new subspace minimization conjugate gradient method based on conic model
           for large-scale unconstrained optimization

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      Abstract: Abstract Conjugate gradient method is one of the most efficient methods for large-scale unconstrained optimization and has attracted focused attention of researchers. With the emergence of more and more large-scale problems, subspace technique becomes particularly important. Recently, many scholars have studied subspace minimization conjugate gradient methods, where the iteration direction is generally obtained by minimizing a quadratic approximate model in a specific subspace. Considering that the conic model contains more information than the quadratic model, and may perform better when the objective function is not close to quadratic, in this paper, a improved conjugate gradient method is presented. Specially, in each iteration, a quadratic or conic model is dynamically selected. The search direction is obtained by minimizing the selected model in a three-dimensional subspace spanned by the current gradient and latest two search directions. It is proved that the search direction satisfies the sufficient descent condition under given conditions. With the modified nonmonotone Wolfe line search, we establish the global convergence and the R-linear convergence of the proposed method under mild assumptions. Numerical experiments indicate that the proposed method is efficient.
      PubDate: 2022-05-16
       
  • Hemivariational inequalities on graphs

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      Abstract: Abstract In this paper, a new class of hemivariational inequalities is introduced. It concerns Laplace operator on locally finite graphs together with multivalued nonmonotone nonlinearities expressed in terms of Clarke’s subdifferential. First of all, we state and prove some results on the subdifferentiability of nonconvex functionals defined on graphs. Thereafter, an elliptic hemivariational inequality on locally finite graphs is considered and the existence and uniqueness of its weak solutions are proved by means of the well-known surjectivity result for pseudomonotone mappings. In the end of this paper, we tackle the problem of hemivariational inequalities of parabolic type on locally finite graphs and we prove the existence of its weak solutions.
      PubDate: 2022-05-13
       
  • Ample felicitous wave structures for fractional foam drainage equation
           modeling for fluid-flow mechanism

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      Abstract: Abstract In this study, traveling wave solutions have been explored with the newly developed improved tanh method and modified \(\left( {1/G^{\prime}} \right)\) -expansion method for the Fractional foam drainage equation, which is famous for modeling physical phenomena such as heat conduction and acoustic waves. Abundant solutions are successfully achieved which have not been appeared ever in the literature. The found solutions are represented graphically to bring out the appearances of different types solitons. In addition, three important points are highlighted in the result and discussion section. First, the comparison of the applied methods, second, the association of the obtained solutions with the literature, and finally the effect of the change in the parameters with physical properties on the wave behavior are discussed.
      PubDate: 2022-05-12
       
  • A new hybrid regularization scheme for removing salt and pepper noise

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      Abstract: Abstract We propose a new model for removing the Salt and Pepper Noise (SPN) by combining the high-order total variation overlapping group sparsity with the nuclear norm regularization. Since the proposed model is convex, non-smooth, and separable, the alternating direction method of multipliers (ADMM) can be employed to solve it and the convergence can be kept. Numerical comparisons with some related state-of-the-art models show that the proposed model can significantly improve the restored quality in terms of the signal to noise ratio (SNR) and the structural similarity index measure (SSIM).
      PubDate: 2022-05-12
       
  • $$\mathbb {Z}_2\mathbb {Z}_2[u^4]$$ Z 2 Z 2 [ u 4 ] -cyclic codes and
           their duals

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      Abstract: Abstract In this paper, we study the algebraic structure of a new family of linear codes over the mixed alphabet \({\mathbb {Z}}_2\mathrm {R}\) , where \(\mathrm {R}={\mathbb {Z}}_2+u{\mathbb {Z}}_2+u^2{\mathbb {Z}}_2+u^3{\mathbb {Z}}_2, \ u^4=0\) . We present generator and parity-check matrices of \({\mathbb {Z}}_2\mathrm {R}\) -linear codes in standard form. We define a \({\mathbb {Z}}_2\mathrm {R}\) -cyclic code of length (r, s) as a \(\mathrm {R}[x]\) -submodule of \(\frac{{\mathbb {Z}}_2[x]}{\langle x^r-1 \rangle } \times \frac{\mathrm {R}[x]}{\langle x^s-1 \rangle }\) and determine its generator polynomial. Also, we determine the size of a \({\mathbb {Z}}_2\mathrm {R}\) -cyclic code by giving a minimal spanning set. Furthermore, we present the generator polynomial of dual code of a \({\mathbb {Z}}_2\mathrm {R}\) -cyclic code of length (r, s) for odd s, while r is set arbitrary. Finally, optimal binary codes are constructed from Gray images of \({\mathbb {Z}}_2\mathrm {R}\) -cyclic codes.
      PubDate: 2022-05-11
       
  • A novel claim size distribution based on a Birnbaum–Saunders and gamma
           mixture capturing extreme values in insurance: estimation, regression, and
           applications

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      Abstract: Abstract Data including significant losses are a pervasive issue in general insurance. The computation of premiums and reinsurance premiums, using deductibles, in situations of heavy right tail for the empirical distribution, is crucial. In this paper, we propose a mixture model obtained by compounding the Birnbaum–Saunders and gamma distributions to describe actuarial data related to financial losses. Closed-form credibility and limited expected value premiums are obtained. Moment estimators are utilized as starting values in the non-linear search procedure to derive the maximum-likelihood estimators and the asymptotic variance–covariance matrix for these estimators is determined. In comparison to other competing models commonly employed in the actuarial literature, the new mixture distribution provides a satisfactory fit to empirical data across the entire range of their distribution. The right tail of the empirical distribution is essential in the modeling and computation of reinsurance premiums. In addition, in this paper, to make advantage of all available data, we create a regression structure based on the compound distribution. Then, the response variable is explained as a function of a set of covariates using this structure.
      PubDate: 2022-05-11
       
  • Auction design for the allocation of carbon emission allowances to supply
           chains via multi-agent-based model and Q-learning

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      Abstract: Abstract To increase competition, control price, and decrease inefficiency in the carbon allowance auction market, limitations on bidding price and volume can be set. With limitations, participants have the same cap bidding price and volume. While without the limitations, participants have different values per unit of carbon allowance; therefore, some participants may be strong and the other week. Due to the impact of these limitations on the auction, this paper tries to compare the uniform and discriminatory pricing in a carbon allowance auction with and without the limitations utilizing a multi-agent-based model consisting of the government and supply chains. The government determines the supply chains' initial allowances. The supply chains compete in the carbon auction market and determine their bidding strategies based on the Q-learning algorithm. Then they optimize their tactical and operational decisions. They can also trade their carbon allowances in a carbon trading market in which price is free determined according to carbon supply and demand. Results show that without the limitations, the carbon price in the uniform pricing is less than or equal to the discriminatory pricing method. At the same time, there are no differences between them in the case with limitations. Overall, the auction reduces the profit of the supply chains. This negative effect is less in uniform than discriminatory pricing in the case without the limitations. Nevertheless, the strong supply chains make huge profits from the auction when mitigation rate is high.
      PubDate: 2022-05-10
       
  • A mixed method approach to the solitary wave, undular bore and
           boundary-forced solutions of the Regularized Long Wave equation

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      Abstract: Abstract The aim of the present work is to obtain numerical solutions of the solitary wave, undular bore and boundary-forced problems for Regularized Long Wave (RLW) equation. For this purpose, low-order modified cubic B-spline is chosen as base functions. Crank–Nicolson formulae combined with efficient space discretization method have been applied. With the aid of Rubin and Graves type linearization technique, nonlinear terms are linearized and a solvable linear equation system has been obtained. Three significant test problems in the literature are solved successfully. The present algorithm has obtained high accurate numerical solutions of the RLW equation. Numerical results are compared with those of some earlier ones and given. The rates of the convergence are also investigated.
      PubDate: 2022-05-10
       
  • Relationships between two pairs of covering approximation operators and
           belief structures

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      Abstract: Abstract As two mathematical tools for dealing with uncertainty, the covering rough set theory and the evidence theory have close relationships with each other. Different covering rough set models are characterized by evidence theory. The purpose of this paper is to interpret belief functions with two pairs of covering approximation operators. The two pairs of covering approximation operators are equivalent to a pair of relation approximation operators. Then, based on a necessary and sufficient condition for a belief structure to be the belief structure induced by the pair of relation approximation operators, necessary and sufficient conditions for a belief structure to be the belief structure induced by the covering approximation operators are presented. Moreover, two kinds of covering reductions in covering information systems defined from the two pairs of covering approximation operators are characterized by the belief and plausibility functions.
      PubDate: 2022-05-07
       
  • A constrained system of matrix equations

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      Abstract: Abstract Sylvester-type matrix equations have wide applications in system science, control theory, and so on. In this paper, we consider a constrained system of Sylvester-type matrix equations over the quaternions. We first derive the necessary and sufficient conditions for the system to have a solution and propose a formula of its general solution when it is solvable. As an application, we then investigate the \(\eta \) -Hermitian solution of a system. Moreover, we also give a numerical example to illustrate the main findings of this paper.
      PubDate: 2022-05-06
       
  • A shape design problem for the Navier–Stokes flow with a convective
           boundary condition

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      Abstract: Abstract In this study, a shape optimization problem for the two-dimensional stationary Navier–Stokes equations with an artificial boundary condition is considered. The fluid is assumed to be flowing through a rectangular channel, and the artificial boundary condition is formulated so as to take into account the possibility of ill-posedness caused by the usual do-nothing boundary condition. The goal of the optimization problem is to maximize the vorticity of the said fluid by determining the shape of an obstacle inside the channel. Meanwhile, the shape variation is limited by a perimeter functional and a volume constraint. The perimeter functional was considered to act as a Tikhonov regularizer and the volume constraint is added to exempt us from possible topological changes. The shape derivative of the objective functional was formulated using the rearrangement method, and this derivative was later on used for gradient descent methods. Additionally, an augmented Lagrangian method and a class of solenoidal deformation fields were considered to take into account the goal of volume preservation. Lastly, numerical examples based on gradient descent and the volume preservation methods are presented.
      PubDate: 2022-05-06
       
  • A novel low-rank matrix approximation algorithm for face denoising and
           background/foreground separation

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      Abstract: Abstract Low-rank matrix recovery from an observation data matrix has received considerable attention in recent years, which has a wide range of applications in pattern recognition and computer vision, such as face denoising, background/foreground separation, gait recognition, image alignment, etc. However, existing algorithms suffer from the interference of small noise, for example, low-level Gaussian noise, which makes their performance not satisfactory. To address this issue, we are based on the unconstrained nonconvex relaxed minimization model for low-rank and sparse matrices recovery using low-rank matrix decomposition, and propose a novel efficient and effective solving algorithm in terms of direction matrices and step sizes alternating iteration in this paper. The three direction matrices are deduced using Newton method, Taylor expansion and so forth, and the appropriate step size of the direction sparse matrix is searched by the nonmonotonous step size linear search technique efficiently. In theory, we provide the convergence theorem of the proposed algorithm. Experimentally, its efficiency and effectiveness are illustrated under appropriate conditions.
      PubDate: 2022-05-05
       
 
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