A Bernoulli trial describing the escape behavior of a lamb to a safe haven in pursuit by a lion is studied under restarts. The process ends in two ways: either the lamb makes it to the safe haven (success) or is captured by the lion (failure). We study the first passage properties of this Bernoulli trial and find that only mean first passage time exists. Considering Poisson and sharp resetting, we find that the success probability is a monotonically decreasing function of the restart rate. The mean time, however, exhibits a nonmonotonic dependence on the restart rate taking a minimal value at an optimal restart rate. Furthermore, for sharp restart, the mean time possesses a local and a global minima. As a result, the optimal restart rate exhibits a continuous transition for Poisson resetting while it exhibits a discontinuous transition for sharp resetting as a function of the relative separation of the lion and the lamb. We also find that the distribution of first passage times under sharp resetting exhibits a periodic behavior.
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http://dx.doi.org/10.1103/PhysRevE.108.L052106 | DOI Listing |
Entropy (Basel)
January 2025
Department of Electronics and Telecommunications (DET), Politecnico di Torino, 10129 Turin, Italy.
Quadratic forms with random kernel matrices are ubiquitous in applications of multivariate statistics, ranging from signal processing to time series analysis, biomedical systems design, wireless communications performance analysis, and other fields. Their statistical characterization is crucial to both design guideline formulation and efficient computation of performance indices. To this end, random matrix theory can be successfully exploited.
View Article and Find Full Text PDFRes Pract Thromb Haemost
January 2025
Division of Hematology and Hemostasis, Department of Medicine I, Medical University of Vienna, Vienna, Austria.
Background: The Vienna Prediction Model (VPM) identifies patients with a first unprovoked deep vein thrombosis of the leg and/or pulmonary embolism who have a low recurrence risk and may, therefore, not benefit from extended-phase anticoagulation.
Objectives: The aim of this study was to evaluate patients with a predicted high risk of recurrent venous thromboembolism (VTE).
Methods And Results: We prospectively followed 266 patients in whom the VPM had predicted a recurrence risk of more than 5.
J Intern Med
January 2025
Department of Public Health and Clinical Medicine, Umeå University, Umeå, Sweden.
Background: Long-term lithium treatment decreases kidney function. However, it remains unclear whether stopping lithium improves kidney function.
Objectives: To study kidney function in patients who stopped and subsequently restarted lithium treatment.
Int J Surg Case Rep
January 2025
Visceral Surgery Department II, Mohammed V Military Hospital, Ibn Sina University Hospital, Rabat, Morocco.
Introduction And Importance: Cutaneous malignant melanoma, originating from melanocytes, is a highly metastatic cancer with an incidence rate of 0.9 per 100,000. The gastrointestinal tract is a common site of metastasis, with the small intestine being particularly affected.
View Article and Find Full Text PDFJ Adolesc Health
January 2025
Department of Endocrinology, Boston Children's Hospital, Boston, Massachusetts; Department of Pediatrics, Harvard Medical School, Boston, Massachusetts.
Purpose: To understand the rate of, and reasons for, discontinuation of gender-affirming hormones (GAH) in transgender adolescents.
Methods: Retrospective cohort study of individuals starting GAH between January 2007 and December 2022. Individuals were included if they were diagnosed with gender dysphoria, were prescribed GAH, and took GAH continuously for a minimum of 6 months.
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