Results 81 to 90 of about 903 (207)

From Block-Oriented Models to the Koopman Operator: A Comprehensive Review on Data-Driven Chemical Reactor Modeling

Mathematics
Some chemical reactors exhibit coupled dynamics with multiple equilibrium points and strong nonlinearities. The accurate modeling of these dynamics is crucial to optimal control and increasing the reactor’s economic performance. While neural networks can
Mustapha Kamel Khaldi, Mujahed Al-Dhaifallah, Ibrahim Aljamaan, Fouad Mohammad Al-Sunni, Othman Taha, Abdullah Alharbi   +5 more
doaj   +1 more source

Running towards: Labour market incentives for runaway slaves in the British Cape Colony, 1830–1838

Asia‐Pacific Economic History Review, EarlyView.
Abstract Recent scholarship on slave escapes has increasingly emphasised economic motivation, but few studies have empirically investigated how market incentives influenced the decision‐making of enslaved individuals during transitions from coerced to wage labour.
Karl Bergemann, Gabriel Brown, Johan Fourie   +2 more
wiley   +1 more source

Pericapsular nerve group block with phenol for non‐operative hip fracture management in patients living with frailty: a prospective multicentre cohort study

Anaesthesia, EarlyView.
Summary Introduction The incidence of hip fractures is rising with the ageing population. For patients living with severe frailty and limited life expectancy, non‐operative management is increasingly considered after shared decision‐making. Given the limited availability of long‐term analgesic options, alternative techniques are needed.
Rachel J. H. Smits, Marte I. Lommerse, Hugo H. Wijnen, Lennart G. Wasmoeth, Glenn van de Vossenberg, Gezina T. M. L. Oei, Henk J. Schuijt, Kris C. P. Vissers, Hanna C. Willems, Jan Willem Kallewaard, Selina E. I. van der Wal, the Dutch‐PENG registry collaborators, Gert R. Roukema, Dawi Van der Stap, J.S.H.A. (Seppe) Koopman, Bart P.A. Spaetgens, Renée Brüggemann, Nicole Lefel, Manon Vugts, Nikki M.F. Noorda, Vincent Van Dongen, Hidde Krot, Nicole Grupa, Daisy Hoofwijk, Léon Timmerman   +24 more
wiley   +1 more source

Model-Based Control Using Koopman Operators

Robotics: Science and Systems XIII, 2017
This paper explores the application of Koopman operator theory to the control of robotic systems. The operator is introduced as a method to generate data-driven models that have utility for model-based control methods. We then motivate the use of the Koopman operator towards augmenting model-based control.
Ian Abraham, Gerardo De La Torre, Todd D. Murphey   +2 more
openaire   +3 more sources

A Koopman-Theoretic Approach to Car-Following and Multi-Lane Interaction Modeling

IEEE Open Journal of Intelligent Transportation Systems
This paper presents a Koopman operator-based approach for the car-following model using SwarmDMD, a dynamic mode decomposition (DMD)-type algorithm designed to capture multi-agent interactions.
Shakib Mustavee, Shaurya Agarwal
doaj   +1 more source

Volunteering While Researching Conflict and Violence: Reflections on Listening, Solidarity, and Decoloniality in Myanmar's Borderlands

Asia Pacific Viewpoint, EarlyView.
ABSTRACT Scholars working on conflict and violence often engage with local organisations, yet the methodological and ethical implications of volunteering‐while‐researching are rarely discussed in writing. This article contributes to debates on decolonizing research by conceptualising volunteering‐while‐researching as a practice that—while imbued with ...
Shona Loong
wiley   +1 more source

Kernel methods for the approximation of the eigenfunctions of the Koopman operator

Physica D: Nonlinear Phenomena
The Koopman operator provides a linear framework to study nonlinear dynamical systems. Its spectra offer valuable insights into system dynamics, but the operator can exhibit both discrete and continuous spectra, complicating direct computations. In this paper, we introduce a kernel-based method to construct the principal eigenfunctions of the Koopman ...
Lee J., Hamzi B., Hou B., Owhadi H., Santin G., Vaidya U.   +5 more
openaire   +3 more sources

A Convex Optimization Approach to Learning Koopman Operators

CoRR, 2021
Koopman operators provide tractable means of learning linear approximations of non-linear dynamics. Many approaches have been proposed to find these operators, typically based upon approximations using an a-priori fixed class of models. However, choosing appropriate models and bounding the approximation error is far from trivial.
openaire   +3 more sources

Recursive Forward-Backward EDMD: Guaranteed Algebraic Search for Koopman Invariant Subspaces

IEEE Access
The implementation of the Koopman operator on digital computers often relies on the approximation of its action on finite-dimensional function spaces. This approximation is generally done by orthogonally projecting on the subspace.
Masih Haseli, Jorge Cortes
doaj   +1 more source

Research Ethics in Conflict Zones: Reflections on ‘Do no Harm’ Ethics for the Research Network

Asia Pacific Viewpoint, EarlyView.
ABSTRACT What does it mean to ‘do no harm’ in academic research? ‘Do no harm’ ethics emphasizes the responsibility of researchers to mitigate the emotional, physical, and political harms that may arise through participation in research. These concerns are heightened in conflict zones, where access constraints and intersecting vulnerabilities shape the ...
K. B. Roberts
wiley   +1 more source