You are currently viewing a new version of our website. To view the old version click .

Mathematics, Volume 12, Issue 21

November-1 2024 - 142 articles

Cover Story: High-dimensional sparse matrix data, like word-word co-occurrence counts and e-commerce item pairs, often have skewed non-negative values with many zeros. We predict item or user relevance using unknown dense vector representations. Our model employs zero-inflated Gamma random variables and cosine similarities. We estimate the unknown parameters with shared parameter alternating zero-inflated Gamma regression models (SA-ZIGs), considering canonical and log link models. We propose two parameter updating schemes and an algorithm for estimating parameters, as well as an analytical convergence analysis. Numerical studies show that a SA-ZIG with a learning rate adjustment performs well, while Fisher scoring without adjustment may fail to find the maximum likelihood estimate. View this paper
  • Issues are regarded as officially published after their release is announced to the table of contents alert mailing list .
  • You may sign up for email alerts to receive table of contents of newly released issues.
  • PDF is the official format for papers published in both, html and pdf forms. To view the papers in pdf format, click on the "PDF Full-text" link, and use the free Adobe Reader to open them.

Articles (142)

  • Article
  • Open Access
1,619 Views
20 Pages

A Bimodal Exponential Regression Model for Analyzing Dengue Fever Case Rates in the Federal District of Brazil

  • Nicollas S. S. da Costa,
  • Maria do Carmo Soares de Lima and
  • Gauss Moutinho Cordeiro

29 October 2024

Dengue fever remains a significant epidemiological challenge globally, particularly in Brazil, where recurring outbreaks strain healthcare systems. Traditional statistical models often struggle to accurately capture the complexities of dengue case di...

  • Article
  • Open Access
8 Citations
1,450 Views
24 Pages

29 October 2024

This article investigates the issue of H∞ security output feedback control for a nonlinear networked cascade control system with deception attacks. First, to further reduce the amount of communication data, reasonably schedule network resources...

  • Article
  • Open Access
1 Citations
1,143 Views
23 Pages

29 October 2024

Given the Yetter–Drinfeld category over any quasigroup and a braided Hopf coquasigroup in this category, we first mainly study the Radford’s biproduct corresponding to this braided Hopf coquasigroup. Then, we investigate Sweedler’s...

  • Article
  • Open Access
1,537 Views
17 Pages

29 October 2024

Investigation of the generalized trigonometric and hyperbolic functions containing two parameters has been a very active research area over the last decade. We believe, however, that their monotonicity and convexity properties with respect to paramet...

  • Article
  • Open Access
1 Citations
2,007 Views
18 Pages

Start Time Planning for Cyclic Queuing and Forwarding in Time-Sensitive Networks

  • Daqian Liu,
  • Zhewei Zhang,
  • Yuntao Shi,
  • Yingying Wang,
  • Jingcheng Guo and
  • Zhenwu Lei

29 October 2024

Time-sensitive networking (TSN) is a kind of network communication technology applied in fields such as industrial internet and intelligent transportation, capable of meeting the application requirements for precise time synchronization and low-laten...

  • Article
  • Open Access
1,102 Views
12 Pages

Order-Preserving Pattern Matching with Partition

  • Joong Chae Na,
  • Youngjoon Kim,
  • Seokchul Kang and
  • Jeong Seop Sim

29 October 2024

Order-preserving pattern matching, which considers the relative orders of strings, can be applied to time-series data analysis. To perform a more meaningful analysis of time-series data, approximate criteria for the order-isomorphism are necessary, c...

  • Article
  • Open Access
1,267 Views
16 Pages

Mathematical Model to Study the Effect of Refuge on Cannibalism in Atractosteus tropicus

  • César Antonio Sepúlveda-Quiroz,
  • Luis Miguel Valenzuela,
  • Gamaliel Blé,
  • Rafael Martínez-García,
  • Carlos Alfonso Álvarez-González and
  • Antioco López-Molina

29 October 2024

Cannibalism is a behavior that different species of fish exhibit in the early stages of their life, and it has been widely reported. In Tabasco, Mexico, the ancestral species Atractosteus tropicus is farmed, which is a freshwater fish with a high nut...

  • Article
  • Open Access
1,112 Views
13 Pages

29 October 2024

The purpose of this article concerns a type of nonlinear boundary value problem of fractional differential equations with the Caputo derivative. Using the fixed point index theory of condensing mapping in cones, the existence results of positive solu...

  • Article
  • Open Access
2 Citations
1,555 Views
18 Pages

29 October 2024

COVID-19 is an enveloped virus with a single-stranded RNA genome. The surface of the virus contains spike proteins, which enable the virus to attach to host cells and enter the interior of the cells. After entering the cell, the virus exploits the ho...

  • Feature Paper
  • Article
  • Open Access
2 Citations
1,421 Views
18 Pages

Boosted Whittaker–Henderson Graduation

  • Zihan Jin and
  • Hiroshi Yamada

29 October 2024

The Whittaker–Henderson (WH) graduation is a smoothing method for equally spaced one-dimensional data such as time series. It includes the Bohlmann filter, the Hodrick–Prescott (HP) filter, and the Whittaker graduation as special cases. A...

of 15

Get Alerted

Add your email address to receive forthcoming issues of this journal.

XFacebookLinkedIn
Mathematics - ISSN 2227-7390