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.
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Showing 1 to 19 of 19 for “"Uncertainty Assessment"”.
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Uncertainty assessment for CFD using error transport equation
… problem arising from the so-called numerical uncertainty. The overall uncertainty (or the global error) involved in CFD results can be due to different sources mainly contributed by (i) discretization error (or solution error due to incomplete grid convergence), (ii) iteration convergence …
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Geomechanical Reservoir Model Calibration and Uncertainty Assessment from Microseismic Data
… both forward modeling methods to illustrate the uncertainty underestimation effect when the standard EnKF is applied to large-scale seismicity density map data. We then discuss the proposed methods for improving the uncertainty quantification results and illustrate the effectiveness of these …
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Uncertainty assessment of complex models with application to aviation environmental systems
… economics-based. Such factors generally contain uncertainty, which leads to uncertainty in model outputs. For such models, it is critical to both the application of model results and the future development of the model that uncertainty be properly assessed. This thesis presents a comprehensive …
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Residential building energy analysis : development and uncertainty assessment of a simplified model
Effective design of energy-efficient buildings requires attention to energy issues during the preliminary stages of design. To aid in the early consideration of a building's future energy usage, a simplified building energy analysis model was developed. Using this model, a new computer program was …
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Uncertainty Assessment in High-Risk Environments Using Probability, Evidence Theory and Expert Judgment Elicitation
<p>The level of uncertainty in advanced system design is assessed by comparing the results of expert judgment elicitation to probability and evidence theory. This research shows how one type of monotone measure, namely Dempster-Shafer Theory of Evidence can expand the framework of uncertainty to …
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Optimizing the Distributed Hydrology Soil Vegetation Model for Uncertainty Assessment with Serial, Multicore and Distributed Accelerations
… and improves DHSVM’s ability to be used with uncertainty analysis methods.</p> <p>iv</p> <p>This paper was able to improve the performance of DHSVM 2 times with serial and compiler optimization. In addition to the serial and compiler optimizations this paper found that OpenMP provided a …
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Uncertainty analysis of an aviation climate model and an aircraft price model for assessment of environmental effects
… assessing uncertainties are important parts in assessment of a complex system. This thesis focuses on the assessment of uncertainty in the price module and the climate module in the Aviation Environmental Portfolio Management Tool (APMT). The aircraft price module is a part of the Partial …
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Assessing environmental benefits and economic costs of aviation environmental policy measures
… how the inclusion of environmental impact assessment and quantification of modeling uncertainties can enable a more comprehensive evaluation of aviation environmental policy measures. A comparison is presented between the conventional cost-effectiveness analysis and an illustrative …
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Assisted history matching using pattern recognition technology
… history matching, operations optimization and uncertainty assessment are the conventional analyses in full field model studies. Realistic modeling of the complexities of a reservoir requires a large number of grid blocks. As the complexity of a reservoir increases and consequently the number of …
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Screening Geostatistical Realizations for SAGD Reservoir Simulation
… flow simulation studies. This reduces the uncertainty assessment time for SAGD process from months to just a few days.
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Caprock characteristics and uncertainties in geological carbon sequestration in the Illinois basin
… seals in GCS is not well understood. Geological uncertainty assessment in GCS research is often limited to reservoir properties. This research presents a current review of the dominant physical characteristics of caprocks and their relation to CO2 containment. This work is limited to argillaceous …
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System level assessment of uncertainty in aviation environmental policy impact analysis
This thesis demonstrates the assessment of uncertainty of a simulation model at the system level, which takes into account the interaction between the modules that comprise the system. Results from this system level assessment process aid policy-makers by identifying the key drivers of uncertainty …
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Hydraulic fracturing design for horizontal wells in the Bakken formation, Williston Basin
… and 4) a comprehensive approach to the uncertainty assessment of the complex numerical simulations is described. </p><p> In this research by integrating reservoir and hydraulic fracture simulations, a robust workflow was used to evaluate several combinations of fracturing materials (i.e. …
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GPU-enhanced power flow analysis
… design and evaluation of a novel method for the uncertainty assessment, based on the fuzzy interval approach; and (ii) the development of an intrinsically parallel method to solve the PF analysis, which is not affected by the Amdahl's law.
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Probabilistic Musculoskeletal Simulation Methods to Address Intersegmental Dependencies of the Knee, Hip, and Spine
… replacement. An initial study identified how uncertainty in musculoskeletal simulation inputs can propagate through the stages of analysis and impact interpretation of outputs from a simulation of gait. Second, improvements to current modeling methodology for patients with total hip …
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Development of an income-based hedonic monetization model for the assessment of aviation-related noise impacts
… convergent validity of the new model. Uncertainty assessment of the income-based model was conducted in order to understand the sources of uncertainty and how they may limit the model's functionality and applicability. Monte Carlo Simulations were used to explicitly quantify the …
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Development of a holistic risk assessment methodology and a corresponding computer model for landfill leachate
… reports on the development of a holistic risk assessment methodology and a corresponding computer model for landfill leachate. Lack of a quantitative risk assessment methodology in a holistic format has prompted this research.<br/><br/>The two main aims of the study are:<br/><br/>• To …
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Estimating and Modeling Transpiration of a Mountain Meadow Encroached by Conifers Using Sap Flow Measurements
… function, enabling model parameter and total uncertainty assessment. We also used the model to inform transpiration scaling for the calibration period in select plots in the meadow, which allowed comparison with simple scaling transpiration estimates.</p> <p>Average total lodgepole pine …
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Mechanistic Modeling, Design, and Optimization of Low Salinity Waterflooding
… analysis, history matching, optimization, and uncertainty assessment. To capture clay effects, a new empirical correlation for cation exchange capacity has been developed. A 2D geostatistical LSW model was used to investigate the effects of geology on process performance. The field-scale …