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Norm decay rates of the Fourier oscillatory integral operators for a class of homogeneous-type polynomial hybrid phases 一类同质型多项式混合相的傅立叶振荡积分算子的规范衰减率
IF 1.4 Q2 MATHEMATICS, APPLIED Pub Date : 2024-11-01 DOI: 10.1016/j.rinam.2024.100513
Tuan Anh Pham , Nhat Huy Vu , Minh Tuan Nguyen
This paper presents a new approach to the L2(R) norm decay rates of the Fourier oscillatory integral operators for some classes of degenerate phases. In particular, the sharp norm decay rates of the Fourier oscillatory integral operators for homogeneous-type polynomial phases, and those for a class of nonsmooth polynomial hybrid phase functions are obtained.
本文提出了一种新方法,用于计算某些退化相的傅立叶振荡积分算子的 L2(R) 准则衰减率。特别是,本文得到了同质型多项式相位的傅立叶振荡积分算子的尖锐规范衰减率,以及一类非光滑多项式混合相位函数的傅立叶振荡积分算子的尖锐规范衰减率。
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引用次数: 0
A capable numerical scheme for solving nonlinear Volterra delay integral equations of the third kind 解决非线性 Volterra 第三类延迟积分方程的有效数值方案
IF 1.4 Q2 MATHEMATICS, APPLIED Pub Date : 2024-11-01 DOI: 10.1016/j.rinam.2024.100512
Rohollah Ghaedi Ghalini , Esmail Hesameddini , Hojatollah Laeli Dastjerdi
In this paper, a class of nonlinear Volterra delay integral equations of the third kind (VDIEs) is approximated by an efficient manner. At first, by using some conditions the existence and uniqueness of the solution is discussed based on the nonlinear cordial Volterra integral operators. Moreover, its convergence analysis is shown by using interpolation properties through some theorems and lemmas. Also, some examples are given and the results are compared with their exact solutions to demonstrate the reliability and capability of this algorithm.
本文以一种有效的方式逼近了一类非线性 Volterra 第三类延迟积分方程(VDIEs)。首先,基于非线性 Volterra 迟滞积分算子,利用一些条件讨论了解的存在性和唯一性。此外,通过一些定理和公理,利用插值特性对其收敛性进行了分析。此外,还给出了一些示例,并将结果与其精确解进行比较,以证明该算法的可靠性和能力。
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引用次数: 0
Three-dimensional seismic denoising based on deep convolutional dictionary learning 基于深度卷积字典学习的三维地震去噪
IF 1.4 Q2 MATHEMATICS, APPLIED Pub Date : 2024-11-01 DOI: 10.1016/j.rinam.2024.100516
Yuntong Li, Lina Liu
Dictionary learning (DL) has been widely used for seismic data denoising. However, it is associated with the following challenges. First, learning a dictionary from one dataset cannot be applied to another dataset and requires setting learning and denoising parameters, which is not adaptive. Second, the DL method based on sparse constraints adds sparse regularization terms to the coefficients, while seismic data only has many coefficients close to zero, which can be approximated as sparse. To overcome these challenges, we propose a seismic data denoising approach using deep convolutional dictionary learning(DCDL) that integrates the explanatory power of DL with the robust learning capacity of deep neural networks. The proposed approach replaces sparse priors with coefficient priors learned from the training dataset and system learns adaptive dictionaries for each seismic datapoint to maintain the data structure. Synthetic and field data in the experiment demonstrate that our method effectively suppresses random noise and maintains seismic data events.
字典学习(DL)已被广泛用于地震数据去噪。然而,它也面临以下挑战。首先,从一个数据集学习字典不能应用于另一个数据集,并且需要设置学习和去噪参数,这不是自适应的。其次,基于稀疏约束的 DL 方法为系数添加了稀疏正则化项,而地震数据只有许多系数接近零,可以近似为稀疏。为了克服这些挑战,我们提出了一种使用深度卷积字典学习(DCDL)的地震数据去噪方法,该方法整合了 DL 的解释能力和深度神经网络的鲁棒学习能力。所提出的方法用从训练数据集学习到的系数前置替换了稀疏前置,系统为每个地震数据点学习自适应字典,以保持数据结构。实验中的合成数据和野外数据表明,我们的方法能有效抑制随机噪声,并保持地震数据事件。
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引用次数: 0
Existence, uniqueness, and collocation solutions using the shifted Legendre spectral method for the Hilfer fractional stochastic integro-differential equations regarding stochastic Brownian motion 关于随机布朗运动的 Hilfer 分式随机积分微分方程的存在性、唯一性和使用移位 Legendre 频谱法的配位解
IF 1.4 Q2 MATHEMATICS, APPLIED Pub Date : 2024-11-01 DOI: 10.1016/j.rinam.2024.100504
Haneen Badawi , Omar Abu Arqub , Nabil Shawagfeh
In this paper, the existence and uniqueness of a specific class of fractional stochastic integro-differential equations considering the stochastic Brownian motion equipped with an appropriate form of a random initial condition is introduced regarding the Hilfer fractional derivative. The proofs of the existence and uniqueness of the solution are presented utilizing sensible constraints upon the deterministic and stochastic coefficients, Schauder's fixed point theorem, and some stochastic theories. Moreover, to get approximations of the exact paths solving such equations we introduce a numerical technique based upon the time-dependent spectral collocation technique considering the shifted Legendre polynomials as a basis. The underlying concept of this technique involves transforming complex equations into a set of algebraic ones by selecting an appropriate set of collocation points within the specified domain where collocation is applied. Herein, the values of the stochastic Brownian motion are calculated using the Mathematica program. For approximating the integrals, the Gauss–Legendre integration scheme is implemented. In addition, we establish the convergence concerning the presented scheme with the error estimate in detail. For this purpose, we present the graphs of maximum errors under the log-log scale. The utilized procedure is leveraged to tackle a variety of stochastic examples encompassing various types to confirm the effectiveness of the obtained theoretical and numerical results. The acquired upshots expose the efficiency and applicability of the presented methodology in the fractional stochastic field.
本文介绍了关于希尔费分式导数的一类特定分式随机积分微分方程的存在性和唯一性,该方程考虑了随机布朗运动,并配有适当形式的随机初始条件。利用对确定系数和随机系数的合理约束、Schauder 定点定理和一些随机理论,证明了解的存在性和唯一性。此外,为了获得求解此类方程的精确路径的近似值,我们引入了一种基于时变谱配位技术的数值技术,将移位 Legendre 多项式作为基础。该技术的基本概念是通过在指定域内选择一组适当的配位点,将复杂方程转换为一组代数方程,并在该域内进行配位。在这里,随机布朗运动的数值是通过 Mathematica 程序计算得出的。为了逼近积分,我们采用了高斯-列根德积分方案。此外,我们还利用误差估计详细确定了所提出方案的收敛性。为此,我们给出了对数标度下的最大误差图。我们利用所使用的程序来处理各种类型的随机例子,以证实所获得的理论和数值结果的有效性。所获得的结果揭示了所提出的方法在分数随机领域的效率和适用性。
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引用次数: 0
On the cross-variation of a class of stochastic processes 论一类随机过程的交叉变异
IF 1.4 Q2 MATHEMATICS, APPLIED Pub Date : 2024-11-01 DOI: 10.1016/j.rinam.2024.100509
Soufiane Moussaten
The present paper deals with the study of the cross-variation of two-dimensional stochastic process defined using the Young integral with respect to a continuous, α-self-similar Gaussian process that does not necessarily have stationary increments, with increment exponent some β>0. We analyze the limit, in probability, of the so-called cross-variation when β in 0,2α, and we finish by providing some examples of known processes that satisfy the required assumptions.
本文研究的是二维随机过程的交叉变异,其定义是相对于一个连续的、α自相似的高斯过程(不一定有静止增量)的杨积分,增量指数为 β>0。我们分析了当β在0,2α内时,所谓交叉变异的概率极限,最后提供了一些满足所需假设的已知过程的例子。
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引用次数: 0
Analyzing inverse backward problem in nonlinear integro-differential equation with memory kernel 分析带有记忆核的非线性积分微分方程中的逆向问题
IF 1.4 Q2 MATHEMATICS, APPLIED Pub Date : 2024-11-01 DOI: 10.1016/j.rinam.2024.100517
M.J. Huntul
This paper focuses on the backward problem related to an integro-differential equation with a general convolutional derivative in time and nonlinear source terms. The existence, uniqueness, and regularity of the mild solution to the proposed problem are established under certain assumptions in a suitable space. The proposed problem is ill-posed in the sense of Hadamard. Moreover, the Fourier truncation method is used to construct a regularized solution. Finally, the convergence rate between the regularized solution and the exact solution is determined.
本文重点研究了与具有一般卷积导数时间和非线性源项的整微分方程有关的后向问题。在一定的假设条件下,在合适的空间内建立了所提问题的温和解的存在性、唯一性和正则性。所提出的问题是哈达玛德意义上的舛误问题。此外,还使用了傅立叶截断法来构建正则化的解。最后,确定了正则化解和精确解之间的收敛速率。
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引用次数: 0
Results on a nonlinear wave equation with acoustic and fractional boundary conditions coupling by logarithmic source and delay terms: Global existence and asymptotic behavior of solutions 具有声学和分数边界条件的非线性波方程与对数源项和延迟项耦合的结果:解的全局存在性和渐近行为
IF 1.4 Q2 MATHEMATICS, APPLIED Pub Date : 2024-11-01 DOI: 10.1016/j.rinam.2024.100515
Abdelbaki Choucha , Salah Boulaaras , Fares Yazid , Rashid Jan , Ibrahim Mekawy
The nonlinear wave equation with acoustic and fractional boundary conditions, coupled with logarithmic source and delay terms, is notable for its capacity to model complex systems, contribute to the advancement of mathematical theory, and exhibit wide-ranging applicability to real-world problems. This paper investigates the global existence and general decay of solutions to a wave equation characterized by the inclusion of logarithmic source and delay terms, governed by both fractional and acoustic boundary conditions. The global existence of solutions is analyzed under various hypotheses, and the general decay behavior is established through the construction and application of a suitable Lyapunov function.
具有声学和分数边界条件的非线性波方程,再加上对数源项和延迟项,因其能够模拟复杂系统、促进数学理论的发展以及广泛适用于现实问题而备受瞩目。本文研究了包含对数源项和延迟项、同时受分数边界条件和声学边界条件制约的波方程的全局存在性和一般衰减解。本文在各种假设条件下分析了解的全局存在性,并通过构建和应用合适的 Lyapunov 函数确定了一般衰减行为。
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引用次数: 0
High-efficiency implicit scheme for solving first-order partial differential equations 求解一阶偏微分方程的高效隐式方案
IF 1.4 Q2 MATHEMATICS, APPLIED Pub Date : 2024-11-01 DOI: 10.1016/j.rinam.2024.100507
Alicia Cordero , Renso V. Rojas-Hiciano , Juan R. Torregrosa , Maria P. Vassileva
We present three new approaches for solving first-order quasi-linear partial differential equations (PDEs) with iterative methods of high stability and low cost. The first is a new numerical version of the method of characteristics that converges efficiently, under certain conditions. The next two approaches initially apply the unconditionally stable Crank–Nicolson method, which induces a system of nonlinear equations. In one of them, we solve this system by using the first optimal schemes for systems of order four (Ermakov’s Hyperfamily). In the other approach, using a new technique called JARM decoupling, we perform a modification that significantly reduces the complexity of the scheme, which we solve with scalar versions of the aforementioned iterative methods. This is a substantial improvement over the conventional way of solving the system. The high numerical performance of the three approaches is checked when analyzing the resolution of some examples of nonlinear PDEs.
我们提出了用高稳定性和低成本迭代法求解一阶准线性偏微分方程(PDEs)的三种新方法。第一种是在特定条件下高效收敛的新数值版特征法。接下来的两种方法最初采用的是无条件稳定的 Crank-Nicolson 方法,该方法引出了一个非线性方程组。在其中一种方法中,我们使用首个四阶系统最优方案(埃尔马科夫超家族)来求解该系统。在另一种方法中,我们使用了一种名为 JARM 解耦的新技术,对方案进行了修改,大大降低了方案的复杂性。与传统的求解方法相比,这是一个实质性的改进。在分析一些非线性 PDEs 的解法时,我们检验了这三种方法的高数值性能。
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引用次数: 0
New discussion on trajectory controllability of time-variant impulsive neutral stochastic functional integrodifferential equations via noncompact semigroup 基于非紧半群的时变脉冲中立型随机泛函积分微分方程轨迹可控性的新讨论
IF 1.4 Q2 MATHEMATICS, APPLIED Pub Date : 2024-11-01 DOI: 10.1016/j.rinam.2024.100518
Dhanalakshmi Kasinathan , Ravikumar Kasinathan , Ramkumar Kasinathan , Dimplekumar Chalishajar
The purpose of this paper is to determine a new discussion on trajectory-(T) controllability of time variant impulsive neutral stochastic functional integrodifferential equations (INSFIDEs) driven by fractional Brownian motion (fBm) via noncompact semigroup in a Hilbert space. Initially, with the help of the Hausdorff measure of noncompactness (HMN), the Mönch fixed point theorem and some inequality techniques, some new standards to guarantee the mild solution for INSFIDEs are obtained. The system’s T-controllability is then examined using Gronwall’s inequality. An example is given to validate the results at the end. This work is applicable to the heart disease biological system using parametric smoothing technique with modifying time variable. Our work extends the work of Boufoussi and Hajji (2012), Chen (2010), Caraballoa et al., (2011), Boudaoui et al., (2015).
利用Hilbert空间中的非紧半群,讨论分数布朗运动驱动的时变脉冲中立型随机泛函积分微分方程的轨迹-(T)可控性问题。首先,利用非紧性的Hausdorff测度(HMN)、Mönch不动点定理和一些不等式技术,得到了保证INSFIDEs温和解的一些新标准。然后使用Gronwall不等式检验系统的t -可控性。最后给出了一个算例来验证结果。这项工作适用于心脏疾病生物系统的参数化平滑技术和修改时间变量。我们的工作扩展了Boufoussi和Hajji (2012), Chen (2010), Caraballoa等人(2011),Boudaoui等人(2015)的工作。
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引用次数: 0
Computing the coarseness measure of a bicolored point set over guillotine partitions 计算断头台分区上双色点集的粗略度量
IF 1.4 Q2 MATHEMATICS, APPLIED Pub Date : 2024-11-01 DOI: 10.1016/j.rinam.2024.100503
José Fernández Goycoolea , Luis H. Herrera , Pablo Pérez-Lantero , Carlos Seara
The coarseness of a set of points in the plane colored red and blue is a measure of how well the points are mixed together. It has appealing theoretical properties, including a connection to the set of points tendency to accept a good clustering partition. Yet, it is computationally expensive to compute exactly. In this paper, the notion of computing the coarseness using a guillotine partition approach is introduced, and efficient algorithms for computing this guillotine coarseness are presented: a top-down approach and a dynamic programming approach, both of them achieving polynomial time and space complexities. Finally, an even faster O(n2log2n) polynomial-time algorithm to compute a reduced version of the measurement named two-level guillotine coarseness is presented using geometric data structures for faster computations. These restrictions establish lower bounds for the general guillotine coarseness that allow the development of more efficient algorithms for computing it.
红蓝两色平面中一组点的粗细度是衡量这些点混合在一起的程度。它具有吸引人的理论特性,包括与接受良好聚类分区的点集倾向相关联。然而,精确计算它的计算成本很高。本文介绍了使用断头台分区方法计算粗度的概念,并提出了计算这种断头台粗度的高效算法:一种自顶向下的方法和一种动态编程方法,这两种方法都实现了多项式时间和空间复杂度。最后,还提出了一种更快的 O(n2log2n) 多项式时间算法,利用几何数据结构计算被称为两级断头台粗度的简化版测量。这些限制建立了一般断头台粗度的下限,从而可以开发出更高效的计算算法。
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引用次数: 0
期刊
Results in Applied Mathematics
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