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Mathematics, Volume 13, Issue 16

August-2 2025 - 155 articles

Cover Story: Investors face the challenge of how to incorporate economic and financial forecasts into their investment strategy, especially in times of financial crisis. To model this situation, we consider a financial market in which the drift and volatility of a risky asset are influenced by a stochastic process indicating the probability of market downturns. We use a dynamic portfolio optimization approach in continuous time to maximize the expected utility of terminal wealth. The optimal investment strategy (indicator-based PPI), corresponds to a CPPI strategy with a stochastic multiplier that depends on the information from the crisis indicator. The model is fitted using historic market data, and this strategy is found to clearly dominate the Black–Scholes-based CPPI strategy, which does not use information from a crisis indicator. View this paper
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Articles (155)

  • Article
  • Open Access
742 Views
29 Pages

Optimizing Efficiency for Logistics Training Using Virtual Reality Movies

  • Qiaoling Zou,
  • Xinyan Jiang,
  • Xiangling Hu,
  • Wanyu Zheng and
  • Dongning Li

20 August 2025

(1) Background: Traditional logistics training faces challenges like high costs, limited scalability, and safety risks. Virtual Reality Movie Training (VRMT) enhances operational accuracy, safety, and accessibility through immersive simulation. Howev...

  • Article
  • Open Access
1 Citations
1,314 Views
22 Pages

A Dempster–Shafer, Fusion-Based Approach for Malware Detection

  • Patricio Galdames,
  • Simon Yusuf Enoch,
  • Claudio Gutiérrez-Soto and
  • Marco A. Palomino

20 August 2025

Dempster–Shafer theory (DST), a generalization of probability theory, is well suited for managing uncertainty and integrating information from diverse sources. In recent years, DST has gained attention in cybersecurity research. However, despit...

  • Feature Paper
  • Article
  • Open Access
1,004 Views
12 Pages

On Solving the Knapsack Problem with Conflicts

  • Roberto Montemanni and
  • Derek H. Smith

20 August 2025

A variant of the well-known Knapsack Problem is studied in this paper. In the classic problem, a set of items is given, with each item characterized by a weight and a profit. A knapsack of a given capacity is provided, and the problem consists of sel...

  • Article
  • Open Access
578 Views
9 Pages

20 August 2025

In this paper, we investigate hypersurfaces in the nearly Kähler 6-sphere S6 and establish several foundational results. In particular, under certain conditions of the function ξ(f)=g(∇f,ξ), we demonstrate that a hypersurface M of S6...

  • Article
  • Open Access
907 Views
23 Pages

A Random Forest-Enhanced Genetic Algorithm for Order Acceptance Scheduling with Past-Sequence-Dependent Setup Times

  • Yu-Yan Zhang,
  • Shih-Hsin Chen,
  • Yen-Wen Wang,
  • Chia-Hsuan Liao and
  • Chen-Hsiang Yu

19 August 2025

This study developed a simple genetic algorithm (SGA) enhanced by a random forest (RF) surrogate model, namely SGARF, to solve the permutation flow-shop scheduling problem with order acceptance under the conditions of limited capacity, weighted-tardi...

  • Article
  • Open Access
1 Citations
532 Views
12 Pages

19 August 2025

This paper proposes an innovative state-sequential sliding mode control (SS-SMC) to suppress chaotic behavior and achieve angular frequency control of incommensurate fractional-order permanent magnet synchronous motor (IFOPMSM) systems. The method is...

  • Article
  • Open Access
1,092 Views
31 Pages

19 August 2025

Consistency indices quantify the degree of transitivity and proportionality violations in a pairwise comparison matrix (PCM), forming a cornerstone of the Analytic Hierarchy Process (AHP) and Analytic Network Process (ANP). Several methods have been...

  • Feature Paper
  • Article
  • Open Access
581 Views
12 Pages

19 August 2025

One of the ways to characterize a probability distribution is to show that it is moment-determinate, uniquely determined by knowing all its moments. The uniqueness, in the absolutely continuous case, depends entirely on the behaviour of the tails of...

  • Article
  • Open Access
1 Citations
791 Views
16 Pages

19 August 2025

This study presents a self-contained derivation and solution of the Black and Scholes partial differential equation (PDE), replacing the standard Wiener process with a smoothed Wiener process, which is a differentiable stochastic process constructed...

  • Article
  • Open Access
702 Views
32 Pages

On the Dynamics of a Synchronous Binary Asteroid System with Non-Uniform Mass Distribution

  • Leandro Forne Brejão,
  • Antonio F. Bertachini de Almeida Prado,
  • Diogo Merguizo Sanchez and
  • Jean P. dos Santos Carvalho

19 August 2025

In this work, particle dynamics in a binary asteroid system is analyzed within the Circular Restricted Three-Body Problem (CRTBP) framework, assuming the largest body is treated as a mass point. The secondary body is modeled as a mass dipole in synch...

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Mathematics - ISSN 2227-7390