Search results for "Emulator"

Emulation of Leaf, Canopy and Atmosphere Radiative Transfer Models for Fast Global Sensitivity Analysis

2016

Physically-based radiative transfer models (RTMs) help understand the interactions of radiation with vegetation and atmosphere. However, advanced RTMs can be computationally burdensome, which makes them impractical in many real applications, especially when many state conditions and model couplings need to be studied. To overcome this problem, it is proposed to substitute RTMs through surrogate meta-models also named emulators. Emulators approximate the functioning of RTMs through statistical learning regression methods, and can open many new applications because of their computational efficiency and outstanding accuracy. Emulators allow fast global sensitivity analysis (GSA) studies on adv…

Physics-aware Gaussian processes in remote sensing

2018

Abstract Earth observation from satellite sensory data poses challenging problems, where machine learning is currently a key player. In recent years, Gaussian Process (GP) regression has excelled in biophysical parameter estimation tasks from airborne and satellite observations. GP regression is based on solid Bayesian statistics, and generally yields efficient and accurate parameter estimates. However, GPs are typically used for inverse modeling based on concurrent observations and in situ measurements only. Very often a forward model encoding the well-understood physical relations between the state vector and the radiance observations is available though and could be useful to improve pre…

Research on the model emulator and experiment checkout of the fuel cell

2011

A fuel cell model emulator, including temperature effects

2010

Pusautomātiskā testēšana ar mobilo ierīču emulatoriem un monitoru sienu

2019

Ir nepieciešama kvalitatīva testēšana, lai gūtu pārliecību par izstrādāto sistēmu. Sistēmas testus ir iespējams veikt gan manuāli, gan automatizēti, un ir izveidoti populāri paņēmieni un formulas, kā noteikt, vai konkrētos sistēmas testus labāk veikt vienā vai citā veidā. Piemēram, balstoties uz testēšanas izmaksām vai priekšrocībām. Tomēr katrs no šiem testēšanas veidiem ir ļoti ierobežots. Testējot manuāli, regresā testēšana ar laiku kļūst pārāk laikietilpīga, un, testējot automatizēti, sarežģīti ir identificēt vizuālos defektus. Tika izveidots un pētīts pusautomātiskās testēšanas ietvars, ar kura palīdzību būtu iespējams apvienot manuālās un automatizētās testēšanas labākos aspektus, tād…

An Emulator Toolbox to Approximate Radiative Transfer Models with Statistical Learning

2015

Physically-based radiative transfer models (RTMs) help in understanding the processes occurring on the Earth’s surface and their interactions with vegetation and atmosphere. When it comes to studying vegetation properties, RTMs allows us to study light interception by plant canopies and are used in the retrieval of biophysical variables through model inversion. However, advanced RTMs can take a long computational time, which makes them unfeasible in many real applications. To overcome this problem, it has been proposed to substitute RTMs through so-called emulators. Emulators are statistical models that approximate the functioning of RTMs. Emulators are advantageous in real practice because…