Article
Engineering, Electrical & Electronic
Saif Khan Mohammed
Summary: The paper rigorously derives Orthogonal Time Frequency Space (OTFS) modulation using the ZAK representation, providing robustness to channel induced Doppler shift. The received basis signals in the delay-Doppler (DD) domain are localized, reducing interference and allowing for joint equalization of information symbols. Compared to OFDM, DD domain modulation exhibits better robustness to channel induced Doppler shift.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2021)
Article
Computer Science, Artificial Intelligence
Caiwen Gao, Zhiqiang Zhang, Baoliang Liu
Summary: This paper proposes an uncertain logistic population model with Allee effect, which describes population dynamic behavior through uncertain differential equation. The solution and behavior analysis of the model are discussed, along with numerical examples to illustrate the obtained conclusions.
Article
Mathematics, Applied
Vinoth Seralan, R. Vadivel, Dimplekumar Chalishajar, Nallappan Gunasekaran
Summary: This work explores the dynamics of the Ricker type predator-prey model in the presence of the additive type Allee effect in the prey population. Euler forward approximations and piecewise constant arguments are used for modeling discrete time models. The study discusses the mathematical features of local stability, bifurcation, and chaotice behavior, and applies control methods to control the bifurcation and fluctuating phenomena.
Article
Chemistry, Physical
Dorothy Miaoyu Huang, Austin T. Green, Craig C. Martens
Summary: In this paper, we derive the energy-conserving momentum jumps employed by the fewest switches surface hopping (FSSH) method from the perspective of quantum trajectory surface hopping (QTSH). The FSSH algorithm can be derived from first principles for localized nonadiabatic transitions. For general processes, the quantum forces characterizing the QTSH method provide accurate results for nonadiabatic dynamics with rigorous energy conservation, without resorting to the artificial momentum rescaling of FSSH.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Mathematics, Applied
Mohammad F. M. Naser
Summary: This study introduces a one-dimensional logistic harvesting model with Allee effect into a time-varying framework. Unlike the autonomous version, this new framework allows all environment-dependent coefficients to vary with time, making it more realistic. Based on these coefficients, a set of conditions that drive the population to mathematical extinction is derived. Various local and global stability notions, including uniform stability, attractivity, asymptotic stability, and uniform exponential stability, are investigated.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2023)
Article
Mathematics, Applied
Zhenkun Wang, Yurij Salmaniw, Hao Wang
Summary: This study explores the impact of Allee effect on the persistence and propagation of a population, utilizing threshold dynamics and bistable traveling waves to provide insight. The existence of bistable waves is proven using the method of monotone semiflows extended to impulsive reaction-diffusion systems. The stability of these waves is then enhanced to global exponential stability, as demonstrated through numerical simulations.
NONLINEAR ANALYSIS-REAL WORLD APPLICATIONS
(2021)
Article
Physics, Multidisciplinary
Jiri Voltr
Summary: The paragraph discusses the global conservation laws requiring fundamental interactions to transfer information between particles, and deriving the most fundamental information transfers and their basic properties from first principles. By considering the characteristic properties of each interaction, it is possible to identify candidates for gravitational, electromagnetic, strong scattering, and weak decay interactions.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Mathematics, Applied
Yu Jin, Rui Peng, Jinfeng Wang
Summary: This article introduces a reaction-diffusion model for addressing the issue of population protection in habitats. It explores the influence of protection zones on long-term population dynamics and proposes strategies for determining the optimal location of the protection zone to ensure population persistence.
PHYSICA D-NONLINEAR PHENOMENA
(2023)
Article
Materials Science, Multidisciplinary
Kasper Linnestad, Seppo Ollila, Stein O. Wasbo, Agne Bogdanoff, Torstein Rotevatn
Summary: A model-based system has been developed for real-time monitoring and operational support of the CAS-OB process, incorporating adaptive estimation and endpoint optimization to reduce temperature deviations and rejected heats. The system, deployed at SSAB Europe OY in Finland, provides operators with optimized suggestions for oxygen and scrap inputs in a user-friendly interface, enhancing decision-making and process efficiency.
Article
Mathematics, Applied
Lenka Pribylova, Deeptajyoti Sen, Veronika Eclerova
Summary: This paper investigates the impact of climate change on seasonally synchronized predator-prey systems. The results suggest that climate change can intensify the instability of the Allee effect, leading to population cycles and extinction.
APPLIED MATHEMATICS AND COMPUTATION
(2024)
Article
Mathematics, Applied
Chen Qianjun, Liu Zijian, Tan Yuanshun, Yang Jin
Summary: A stochastic hybrid population model with Allee effect, Markovian switching, and impulsive perturbations is proposed and studied in this paper. The conditions for extinction and permanence are obtained, and some asymptotic properties are investigated.
JOURNAL OF APPLIED MATHEMATICS AND COMPUTING
(2023)
Article
Automation & Control Systems
George Boutselis, Evangelos Theodorou
Summary: This study presents a discrete-time optimal control framework for systems evolving on Lie groups, generalizing the original differential dynamic programming method through a coordinate-free, Lie-theoretic approach. A key element lies in the use of quadratic expansion schemes, optimizing local approximations iteratively until reaching a (sub)optimal solution.
IEEE TRANSACTIONS ON AUTOMATIC CONTROL
(2021)
Article
Physics, Multidisciplinary
Thomas E. Gartner III, Pablo M. Piaggi, Roberto Car, Athanassios Z. Panagiotopoulos, Pablo G. Debenedetti
Summary: The study provides preliminary evidence of liquid-liquid phase transition in water using molecular simulation techniques and a neural network model based on density functional theory calculations.
PHYSICAL REVIEW LETTERS
(2022)
Article
Environmental Sciences
Ana C. Vaz, Mandy Karnauskas, Claire B. Paris, Jennifer C. Doerr, Ronald L. Hill, Calusa Horn, Margaret H. Miller, Melissa Neuman, Kevin J. McCarthy, Nicholas A. Farmer
Summary: This study assessed how the population connectivity of queen conch changes with spatially variable patterns of fishing exploitation. Results showed that the heterogeneous fishing pressure and localized depletion significantly alter population connectivity patterns and structure. This highlights the importance of considering regional and local measures in the conservation and management of queen conch populations and nursery habitat.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Automation & Control Systems
Shijie Zhou, Wei Lin, Jianhong Wu
Summary: This article establishes several generalized versions of the invariance principle for describing the long-term dynamical behaviors of discrete-time stochastic dynamical systems based on the typical discrete-time semi-martingale convergence theorem. These principles are suitable for investigating the dynamics in autonomous or non-autonomous systems and their applicability is demonstrated via representative examples. The established principle for autonomous systems allows estimating the time when an orbit, initiating outside a particular bounded set, finally enters it. A generalized version of discrete-time semi-martingale convergence theorem is provided, along with a counterexample highlighting the importance of considering delicate conditions in the use of convergence theorems.
Article
Ecology
Anders Siren, Kalle Parvinen
ECOLOGICAL ECONOMICS
(2015)
Article
Biology
Kalle Parvinen, Ake Brannstrom
BULLETIN OF MATHEMATICAL BIOLOGY
(2016)
Article
Biology
Kalle Parvinen, Anne Seppanen
JOURNAL OF MATHEMATICAL BIOLOGY
(2016)
Article
Biology
Kalle Parvinen, Hisashi Ohtsuki, Joe Yuichiro Wakano
JOURNAL OF THEORETICAL BIOLOGY
(2017)
Article
Biology
Tuomas Nurmi, Kalle Parvinen, Vesa Selonen
JOURNAL OF THEORETICAL BIOLOGY
(2017)
Article
Biology
Kalle Parvinen, Hisashi Ohtsuki, Joe Yuichiro Wakano
JOURNAL OF THEORETICAL BIOLOGY
(2018)
Article
Biology
Tuomas Nurmi, Kalle Parvinen, Vesa Selonen
JOURNAL OF THEORETICAL BIOLOGY
(2018)
Article
Ecology
Anders Henrik Siren, Kalle Parvinen
FRONTIERS IN ECOLOGY AND EVOLUTION
(2019)
Article
Ecology
Zepeng Sun, Kalle Parvinen, Mikko Heino, Johan A. J. Metz, Andre M. de Roos, Ulf Dieckmann
AMERICAN NATURALIST
(2020)
Article
Biology
Anni S. Halkola, Kalle Parvinen, Henna Kasanen, Satu Mustjoki, Tero Aittokallio
JOURNAL OF THEORETICAL BIOLOGY
(2020)
Article
Biology
Kalle Parvinen, Johan A. J. Metz, Ulf Dieckmann
Summary: According to the competitive-exclusion principle, the number of regulating variables describing a community dynamics is an upper bound on the number of species that can coexist at equilibrium. When studying which species can invade a community, it is enough to know the sign of each species' long-term growth rate. The environmental dimension is the ultimate generalization of the traditional notions of the number of regulating variables or limiting factors.
JOURNAL OF THEORETICAL BIOLOGY
(2021)
Article
Multidisciplinary Sciences
Kalle Parvinen, Hisashi Ohtsuki, Joe Yuichiro Wakano
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2020)
Article
Biology
Hisashi Ohtsuki, Claus Rueffler, Joe Yuichiro Wakano, Kalle Parvinen, Laurent Lehmann
JOURNAL OF THEORETICAL BIOLOGY
(2020)
Article
Biology
Anni S. Halkola, Tero Aittokallio, Kalle Parvinen
Summary: This study models the tumor microenvironment as a metapopulation to investigate the dynamics of cancer development at a single-cell level. The research reveals that angiogenesis promotes cancer cell growth, while anti-angiogenic treatment reduces the need for cytotoxic therapy. Interestingly, the model predicts that treatment resistance might become favorable to cancer cells when the anti-angiogenic treatment is intensive enough.
JOURNAL OF THEORETICAL BIOLOGY
(2022)
Article
Biology
Kalle Parvinen, Hisashi Ohtsuki, Joe Yuichiro Wakano
Summary: Theoretical studies have shown that environmental heterogeneity and temporal heterogeneity can both impact the evolution of dispersal. In this study, the authors generalize previous models and find richer dynamics, including bistable evolutionary dynamics. They also examine the evolution of conditional dispersal strategy and find that the ability to use patch quality information is important. The study highlights the importance of considering patch quality information in the evolution of dispersal.
JOURNAL OF THEORETICAL BIOLOGY
(2023)
