Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 16 of 16 for “"Parameter calibration"”.
-
Image-Based Geotechnical Constitutive Model Parameter Calibration
… tests are often used to calibrate material parameters that are required to simulate soil behaviour through appropriately simplified mathematical models, commonly known as constitutive models. Conventional "element" tests (e.g. triaxial, simple shear) typically assume a homogeneous …
-
Wind Turbine Parameter Calibration Using Deep Learning Approaches
<p>The inertia and damping coefficients are critical to understanding the workings of a wind turbine, especially when it is in a transient state. However, many manufacturers do not provide this information about their turbines, requiring people to estimate these values themselves. This research …
-
Stochastic Volatility with Levy Processes: Calibration and Pricing
… models with Levy processes are treated in parameter calibration by the Carr-Madan fast Fourier transform (FFT) method and pricing through the partial integro-differential equation (PIDE) approach. First, different models where the underlying log stock price or volatility driven by either a …
-
Calibração automática de modelos tipo chuva-vazão utilizando técnicas de suavização: uma aplicação ao modelo SMAP-II
Parameter calibration is a critical, but essential step in Hydrologic Modelling. In this way, some optimization algorithms for automatic calibration have been applied to conceptual Rainfall-Runoff modelling, but several problems have been detected, which have motivated many researches. This work …
-
Item parameter drift and online calibration
… based computerized adaptive assessment is item parameter invariance. Sometimes, however, item parameters are not invariant across different test administrations due to factors other than sampling error; and this phenomenon is termed item parameter drift. Several methods have been developed to …
-
New methods of online calibration for item bank replenishment
"Item parameter calibration is important for tests based on item response theory, because the scoring, equating, bias analysis of the test, and item selection in adaptive tests are all based on the item parameters. As a test is continuously administered, item calibration needs to be conducted for …
-
The Robustness of Rasch True Score Preequating to Violations of Model Assumptions Under Equivalent and Nonequivalent Populations
… using a compensatory two dimensional (2D) three parameter logistic (3PL) Item Response Theory (IRT) model. The Rasch model was used to calibrate difficulty parameters using two methods: Fixed Parameter Calibration (FPC) and separate calibration with the Stocking and Lord linking (SCSL) method. A …
-
Performance of RC Columns Retrofitted with UHPFRC Jackets Under Cyclic Displacement Reversals
… material laws were formulated, based on parameter calibration with the results collected from the experimental component. An extensive database on bond experiments from the literature was assembled, including specimens fabricated with UHPFRC and engineered cementitious composites (ECC). …
-
Kinetic temperature of structures for resilience, instability and failure analysis of building systems
… structural members. An original potential parameter calibration procedure is proposed to link our methodology to classical continuum mechanics and experiments. At the interface between structural mechanics and statistical physics lie the thermodynamic ensembles, which dictate the …
-
Neural parameter inference for large-scale multi-agent systems
… components—such as constant or time-varying parameters—by differentiating through the full set of governing equations. I argue that a targeted incorporation of machine learning to augment, rather than replace, physics-informed models (e.g. partial differential equations) addresses several of …
-
Hydrological modelling with components: the OMS3 NewAge-JGrass system
… channel routing and tools for automatic model parameter calibration such as DREAM, Particle Swarm and LUCA. NewAge requires interpolated meteorological variables (such as air temperature, precipitation, and relative humidity) as input data for each hillslope. They can be computed by a …
-
A Robust Dynamic State and Parameter Estimation Framework for Smart Grid Monitoring and Control
… gross errors on the measurements and the model parameter values while providing good state estimates even in the presence of large dynamical system model uncertainties and non-Gaussian thick-tailed process and observation noises. It turns out that the current Kalman filter-based dynamic state …
-
A penalty-free multi-objective evolutionary optimization approach for the design and rehabilitation of water distribution systems
… penalty functions, additional "boundary search" parameters, or special constraint handling procedures. No operator intervention, parameter calibration and trial runs are required. Conceptually, the approach is straightforward and probably the simplest hitherto. The model is applied to several …
-
Mathematic approaches for the calibration of the CHAMP satellite magnetic field measurements
… of the data during the whole mission, the calibration of the magnetometers has to be performed routinely in orbit. The scalar magnetometer serves as the magnetic reference and its readings are compared with the readings of the vector magnetometer. The readings of the vector magnetometer are …
-
OPTIMIZATION FOR CALIBRATION OF WATER RESOURCES SYSTEMS INCLUDING NEW PARALLEL GLOBAL ALGORITHMS AND APPLICATIONS TO HYDRODYNAMICS AND WATER QUALITY LAKE PDE MODELS
… is developed and successfully applied to the calibration of two computationally expensive 3D hydrodynamic lake models (5 hours per simulation). We also introduce another new parallel algorithm GOPS to efficiently use many processors (up to 128 processors in parallel) for optimization problems …
-
Consistent treatment of transport properties of weakly-ionized gas mixtures in DSMC
… for calibrating the DSMC collision model parameters to achieve consistency in the transport processes is presented. The DSMC collision cross-section model parameters are calibrated for high temperature conditions by matching the collision integrals from DSMC against physically accurate …