Search Results for author: Matthew J. Simpson

Found 15 papers, 13 papers with code

Structured methods for parameter inference and uncertainty quantification for mechanistic models in the life sciences

1 code implementation4 Mar 2024 Michael J. Plank, Matthew J. Simpson

Parameter inference and uncertainty quantification are important steps when relating mathematical models to real-world observations, and when estimating uncertainty in model predictions.

Caricature Uncertainty Quantification

Exact sharp-fronted solutions for nonlinear diffusion on evolving domains

1 code implementation13 Jun 2023 Stuart T. Johnston, Matthew J. Simpson

We obtain the solution by identifying a series of transformations that converts the model of a nonlinear diffusive process on an evolving domain to a nonlinear diffusion equation on a fixed domain, which admits known exact solutions for certain choices of diffusivity functions.

valid

Exact solutions for diffusive transport on heterogeneous growing domains

1 code implementation19 Apr 2023 Stuart T. Johnston, Matthew J. Simpson

The exact solutions reveal the relationship between model parameters, such as the diffusivity and the type and rate of domain growth, and key statistics, such as the survival and splitting probabilities.

valid

Interpreting how nonlinear diffusion affects the fate of bistable populations using a discrete modelling framework

1 code implementation21 Dec 2021 Yifei Li, Pascal R. Buenzli, Matthew J. Simpson

One way of exploring this question is to study population dynamics using reaction-diffusion equations, where migration is usually represented as a linear diffusion term, and birth-death is represented with a bistable source term.

Extinction of bistable populations is affected by the shape of their initial spatial distribution

1 code implementation5 Jan 2021 Yifei Li, Stuart T. Johnston, Pascal R. Buenzli, Peter van Heijster, Matthew J. Simpson

In this work we study population survival or extinction using a stochastic, discrete lattice-based random walk model where individuals undergo movement, birth and death events.

Position

Learning differential equation models from stochastic agent-based model simulations

1 code implementation16 Nov 2020 John T. Nardini, Ruth E. Baker, Matthew J. Simpson, Kevin B. Flores

We propose that methods from the equation learning field provide a promising, novel, and unifying approach for agent-based model analysis.

Dynamical Systems

Biologically-informed neural networks guide mechanistic modeling from sparse experimental data

1 code implementation26 May 2020 John H. Lagergren, John T. Nardini, Ruth E. Baker, Matthew J. Simpson, Kevin B. Flores

Biologically-informed neural networks (BINNs), an extension of physics-informed neural networks [1], are introduced and used to discover the underlying dynamics of biological systems from sparse experimental data.

A novel mathematical model of heterogeneous cell proliferation

no code implementations6 Mar 2020 Sean T. Vittadello, Scott W. McCue, Gency Gunasingh, Nikolas K. Haass, Matthew J. Simpson

As motivation for our model we provide experimental data that illustrate the induced-switching process.

A practical guide to pseudo-marginal methods for computational inference in systems biology

1 code implementation28 Dec 2019 David J. Warne, Ruth E. Baker, Matthew J. Simpson

For many stochastic models of interest in systems biology, such as those describing biochemical reaction networks, exact quantification of parameter uncertainty through statistical inference is intractable.

Uncertainty Quantification

Rapid Bayesian inference for expensive stochastic models

1 code implementation14 Sep 2019 David J. Warne, Ruth E. Baker, Matthew J. Simpson

In this work, we present new computational Bayesian techniques that accelerate inference for expensive stochastic models by using computationally inexpensive approximations to inform feasible regions in parameter space, and through learning transforms that adjust the biased approximate inferences to closer represent the correct inferences under the expensive stochastic model.

Computation Cell Behavior Molecular Networks

Simulation and inference algorithms for stochastic biochemical reaction networks: from basic concepts to state-of-the-art

1 code implementation14 Dec 2018 David J. Warne, Ruth E. Baker, Matthew J. Simpson

Stochasticity is a key characteristic of intracellular processes such as gene regulation and chemical signalling.

Molecular Networks

New homogenization approaches for stochastic transport through heterogeneous media

1 code implementation21 Oct 2018 Elliot J. Carr, Matthew J. Simpson

In this work, we present a new class of homogenization approximations by considering a stochastic diffusive transport model on a one-dimensional domain containing an arbitrary number of layers with different jump rates.

Biological Physics Computational Physics 82C70

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