916 Results Found

This article introduces the two-sided length-biased Wald (TSLBW) distribution, an extension of the length-biased Wald (LBW) distribution, designed to model processes in which failure or event completion can originate from both sides. The TSLBW distri...

In this paper, we consider an insurance risk model with two-sided jumps, where downward and upward jumps typically represent claim amounts and random gains, respectively. We use the Laguerre series to expand the Gerber–Shiu function and estimat...

We look at estimates for the Green’s function of time-fractional evolution equations of the form $D_{0+\ast }^{\nu }u=Lu$ , where $D_{0+\ast }^{\nu }$ is a Caputo-type time-fractional derivative, depending on a Lév...

In the first part of the paper, the positive and negative jumps of NASDAQ daily (log-) returns and three of its stocks are estimated based on the methodology presented by Theodosiadou et al. 2016, where jumps are assumed to be hidden random variables...

In this paper, we study a differential operator of parabolic type with a variable and unbounded coefficient, defined on an infinite strip. Sufficient conditions for the existence and compactness of the resolvent are established, and an estimate for t...

In many real-life scenarios, one variable is observed only if the other concomitant variable or the set of concomitant variables (in the multivariate scenario) is truncated from below, above, or from a two-sided approach. Hidden truncation models hav...

In this paper, we consider a class of degenerate elliptic equations with arbitrary power degeneration. The issues about the existence, uniqueness, and smoothness of solutions of the semiperiodic Dirichlet problem for a class of degenerate elliptic eq...

Indoor localization using fine time measurement (FTM) round-trip time (RTT) with respect to cooperating Wi-Fi access points (APs) has been shown to work well and provide 1–2 m accuracy in both 2D and 3D applications. This approach depends on AP...

This paper establishes a family of two-sided Ostrowski-type inequalities on arbitrary time scales under variable derivative bounds. The main approach is based on auxiliary functions that provide variable lower and upper envelopes for the delta deriva...

A good merger and acquisition (M&A) cannot be achieved without a good matching that not only ensures high satisfaction for both bidders and targets but also operates as a two-sided process based on their mutual evaluations. Previous studies mostl...

This paper develops a method to obtain multivariate kernel functions for density estimation problems in which the density function is defined on compact support. If domain-specific knowledge requires certain conditions to be satisfied at the boundary...

In industrialized countries atopic diseases have been reported to be less likely in children and adolescents with a migrant background compared to non-migrants. This paper aimed at both examining and comparing prevalence of asthma, allergic rhinoconj...

In this paper, we investigate a practical numerical method for solving a one-dimensional two-sided space-fractional diffusion equation with variable coefficients in a finite domain, which is based on the classical Crank-Nicolson (CN) method combined...

We develop two-sided, order-free bounds for the Sylvester matrix differential equation $\dot{X}\left(t\right)=AX\left(t\right)+X\left(t\right)B+C,X\left(t_0\right)=X_0,$ allowing rectangular and nonsymmetric solutions. We derive upper and lower bounds for each singular value of $X\left(t\right)$. A Dini-deriva...

Simultaneous confidence intervals are commonly used in joint inference of multiple parameters. When the underlying joint distribution of the estimates is unknown, nonparametric methods can be applied to provide distribution-free simultaneous confiden...

In this paper, the estimation problem of two parameters of a lifetime distribution with a bathtub-shaped failure rate function based on adaptive progressive type-II censored data is discussed. This censoring scheme allows the experiment to be more ef...

Digital Twins used as security replicas of cyber-physical systems must detect attacks while keeping decisions inspectable. Atop an existing entropy-gated neurosymbolic operator, we introduce an Entropy Analysis Layer (EAL), which treats estimator, wi...

In this paper, we introduce new two-sided Ostrowski-type inequalities on arbitrary time scales. Using the delta derivative and delta integral operators, we obtain explicit bounds for the deviation of a function value from the mean delta integral, und...

A methodology for the statistical modeling of boundary value problems of mathematical physics for parabolic equations used to describe transport processes in a layer with incomplete data at the boundary of a body has been developed and presented. The...

Making use of uniformly minimum-variance unbiased estimators for the parameters of two-parameter exponential distributions and the distribution of pivotal quantities, we propose one-stage multiple comparison procedures for k mean lifetimes with the a...

The notion of length-biased distribution can be used to develop adequate models. Length-biased distribution was known as a special case of weighted distribution. In this work, a new class of length-biased distribution, namely the two-sided length-bia...

We study two coupled two-sided quaternion matrix equations sharing an unknown. Because the map $X\mapsto AXB$ is real-linear but not generally quaternion-linear, an order-preserving real representation converts the problem into one real system. It yield...

We establish the existence and uniqueness of a positive continuous solution for some semilinear elliptic equations on an unbounded domain $\mathfrak{D}$ in ${\mathbb{R}}^2$ with a nonempty compact boundary. The reaction term is allowed to change sign and satisfies a global Lip...

The inverse Lomax distribution has been widely used in many applied fields such as reliability, geophysics, economics and engineering sciences. In this paper, an unexplored practical problem involving the inverse Lomax distribution is investigated: t...

Under doubly censoring, the one-stage multiple comparison procedures with the control in terms of exponential median lifetimes are presented. The uniformly minimum variance unbiased estimator for median lifetime is found. The upper bounds, lower boun...

Parameters estimation of sequential movement events of vehicles is facing the challenges of noise interferences and the demands of portable implementation. In this paper, we propose a robust direction-of-arrival (DOA) estimation method for the sequen...

This paper investigates the problem of exponential synchronization control for complex dynamical systems (CDNs) with input saturation. Considering the effects of transmission delay, a memory sampled-data controller is designed. A modified two-sided l...

The process quality capability indicators C_p and C_pk are widely used to measure process capability. Traditional metric estimation methods require process data to be explicit and normally distributed. Often, the actual data obtained from the productio...

This paper investigates a subarray based algorithm for direction of arrival (DOA) estimation of wideband uniform linear array (ULA), under the presence of frequency-dependent mutual coupling effects. Based on the Toeplitz structure of mutual coupling...

In this paper, we obtain new criteria for the boundedness, the compactness and the essential norm of composition operators acting from the space ${\mathcal{H}}^{\infty }$ of bounded harmonic mappings into weighted harmonic Bloch spaces ${\mathcal{B}}_H^{\alpha }$, $0<\alpha <\&inf$...

Descriptive clinical tools for characterizing burn scars are limited by between-user variability and unknown sensitivity to change over time. We previously described preclinical assessment of stereophotogrammetry as a valid measure of burn-related sc...

The presented paper discusses the matrix summability of the Walsh–Fourier series. In particular, we discuss the convergence of matrix transforms in $L_1$ space and in $C_W$ space in terms of modulus of continuity and matrix transform variation. Moreo...

Background/Objectives: Food texture and oral processing characteristics may shape eating behavior, dietary intake, and body weight, yet the role of food chewiness in adolescent weight status remains underexplored. This study examined associations bet...

The paper presents a statistical model based on the two-weighted exponential distribution (TWED) to examine censored Human Immunodeficiency Virus (HIV) survival information. Identifying HIV as a disability, the study endorses an inclusive and sustain...

By solving a Marchenko equation, Green’s functions at an arbitrary (inner) depth level inside an unknown elastic layered medium can be retrieved from single-sided reflection data, which are collected at the top of the medium. To date, it has on...

We study the asymptotic behavior in a neighborhood of zero of the sum of a sine series $g(\mathit{b},x)={\sum }_{k=1}^{\infty }{b}_{k}sinkx$ whose coefficients constitute a convex slowly varying sequence $\mathit{b}$. The main term of the asymptotics of the sum of such a series was obtained by...

Direction of arrival (DOA) estimation is the basis for underwater target localization and tracking using towed line array sonar devices. A method of DOA estimation for underwater wideband weak targets based on coherent signal subspace (CSS) processin...

During the construction of concrete structures, it is often useful to know compressive strength at an early age. This is an amount of strength required for the safe removal of formwork, also known as stripping strength. It is certainly helpful to det...

Cumulative sum control charts that are based on the estimated control limits are extensively used in practice. Such control limits are often characterized by a Phase I estimation error. The presence of these errors can cause a change in the location...

High-precision direction of arrival (DOA) of wideband signals is a very important technology in the field of radar and communication. In this work, we propose an efficient support vector regression (SVR) architecture via a genetic algorithm (GA) for...

This study examines whether overall organizational climate (OC) and its five dimensions are positively associated with job satisfaction (JS) in a municipal administration. We conducted a cross-sectional, non-experimental, correlational survey using v...

Background/Objectives: Cortical development in children and adolescents shows marked regional heterogeneity, but whether age-related trajectory properties are organized consistently along an externally defined sensorimotor–association (S–...

Using 21,879 firm–year observations from China’s A-share listed companies (2009–2021), we examine the within-firm association between enterprise digitalization and estimated carbon exposure constructed as industry–year carbon...

The median survival time is widely reported because it is robust and easily interpretable. Under right censoring, however, obtaining a confidence interval with two finite endpoints can be difficult. We present a Monte Carlo comparison of four confide...

Personnel selection represents a two-sided matching problem in which firms compete for qualified candidates by designing job-offer packages. While traditional models assume fully rational agents, real-world decision-makers often face bounded rational...

Estimating the corneal elasticity can provide valuable information for corneal pathologies and treatments. Ophthalmologic pathologies will invariably cause changes to the elasticity of the cornea. For example, keratoconus and the phototoxic effects o...

Background and objectives: Targeted therapy is widely used in the era of precision medicine. Whether the sequence in which targeted therapy and chemotherapy are performed matters, is however not known. We examined the impact of the sequential treatme...

We establish the exact power-law asymptotics of the ruin probability, as a function of the initial capital, in the Sparre Andersen model for non-life insurance with investments in an arbitrary Lévy process. The main advance over previous work,...

Meta-analysis techniques allow researchers to aggregate effect sizes—like standardized mean difference(s), correlation(s), or odds ratio(s)—of different studies. This leads to overall effect-size estimates and their confidence intervals....

Explicit formulas for graphical Stirling and Bell numbers are known for relatively few graph families. We derive exact expressions for three classes whose independence structure admits a complete combinatorial description: complete multipartite graph...