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 20 of 681 for “"historical data"”.
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A database query language for operations on historical data
Information in most existing database management systems reflects only the current state of the data. However, many real world applications require the storage of and access to historical information. In this thesis a historical model is presented which integrates comprehensive time processing …
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Supporting Transfer Time Predictions in Medical Dispatch using Visualizations of Historical Data
… proposes the use of visualizations of historical transport time data as a decision-aid to support predictions of patient transport time. Specifically, this dissertation examines whether visualizing the variability of historical data, which can help decision makers understand the …
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Investigating user experience and bias mitigation of the multi-modal retrieval of historical data
… to African precolonial heritage artefact data, where the data contains the bias of the curators of the artefacts and there are primary concerns surrounding the social responsibility of these systems. Historians have argued that common information retrieval algorithms may further bias …
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The application of historical data and computational methods for investigating causes of long-term morphological change in estuaries : a case study of the Mersey Estuary, UK
… This thesis evaluates approaches to analysing historical data and applying computational methods to examine the interaction between factors forcing long-term estuary morphology. Historical data is of considerable value to analysis of long-term morphological change in estuaries, and forms a …
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A Modified Bayesian Power Prior Approach with Applications in Water Quality Evaluation
… Many times, the sample size of water monitoring data is too small to have adequate power. Here, we present a Bayesian power prior approach by incorporating the current data and historical data and/or the data collected at neighboring stations to make stronger statistical inferences on the …
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Fault detection in multivariate processes : handling autocorrelation, contamination, and small sample sizes in engineered systems.
… the availability of a large set of in-control historical data is also usually assumed, but often unstated. However, in some cases, minimal historical data are available, and the assumptions of multivariate normality and/or independence may be violated. Furthermore, even when a large set of …
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Pisces: a computer simulator to aid planning in state fisheries management agencies
… clarity is usually reflected by the amount of historical data available upon which to base the relationship. Adequate historical data exists to derive the relationships between angler-days and access development, water development, regulation changes, and catchable trout stocking, so these …
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LSTM prediction capability on the South African JSE Top 40 of historical and live data
… (LSTM) models in stock price forecasting using data from the South African FTSE/JSE Top 40 index, a domain yet to be extensively explored, particularly in real-time data analysis. Addressing the gap in existing research, this study assesses LSTM model predictive capability in the South African …
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UAV, GNSS, total station, and data management applied to an ancient clay structure as a historic building information modeling proposal: a case study of Huaca Arco Iris (Trujillo, Perú)
… efficient and interactive method for managing historical data and represent- ing the current states of ancient clay structures. In this study, traditional geodetic techniques were employed to digitally locate a structure without compromising its topographic information to create an accurate …
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Statistical arbitrage in South African equity markets
… process. This strategy is then evaluated over historical data for the South African equity market from 2001 to 2013 through backtesting. In addition the strategy is evaluated over data generated from Monte Carlo simulations as well as bootstrapped historical data. The results show that the …
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Methods for enhancing system dynamics modelling : state-space models, data-driven structural validation & discrete-event simulation
… opinion, rather than being derived directly from historical data. This thesis aims to address these limitations and hence enhance system dynamics modelling. This research is undertaken in the context of SD models from a major telecommunications provider. In the first part of the thesis we …
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An Approach to Real Time Adaptive Decision Making in Dynamic Distributed Systems
… based on a good model of the system or based on historical data. In many cases, the good model is not available. In that case, prediction using historical data is the only option. It is necessary to detect similarities with the current situation and extrapolate future values. In other words, we …
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Estimation of origin-destination flows for dynamic traffic assignment
… Assigned traffic flows, deviation from historical data, and relative proportions in historical data. The method can be easily extended to make use of other sources of information such as direct measurements of OD flows from probe vehicles. The framework is extended to allow for …
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Monitoring Anthropogenic Carbon in Cape Cod Bay
… resource-intensive to measure and have little historical data in Cape Cod Bay. Seawater collected from Cape Cod Bay was analyzed for pHₜ, DIC, and TA and compared to historic data from the region. A multi-linear-regression was performed to create a model to predict the measured parameters of …
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A genome-wide association study of resistance to the yellow rust pathogen (Puccinia striiformis f. sp. tritici) in elite UK wheat germplasm
… mapping populations and takes advantage of historical phenotypic data. In the present study, an association panel of 327 bread wheat varieties have been assembled and genotyped with 1806 DArT markers. Genetic structure analysis revealed a low stratification of the panel based on geographical …
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On some aspects of portfolio management
… investment algorithms and test them with historical data sets. With regard to the stochastic portfolio we develop an optimal formula to manage the portfolio with daily trading in terms of the weights that are assigned to the different stocks in the portfolio. The implementation of the …
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Evaluating the natural attenuation of synthetic organic chemicals in a chalk aquifer
… in-situ biodegradation by: (a) analysing historical monitoring data to identify and support biodegradation processes at the contaminated field site; (b) the development of in-situ microcosm approaches, (c) determining the catabolic activity present across the site using ex-situ microcosm …
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Historically implied swaption skews using non-parametric methods
This dissertation aims to derive historically realised volatilities for swaptions of a long-term nature within the South African market, which is illiquid and over-the- counter. To achieve this the dissertation adopts and constructs non-parametric methods which only make use of historical realised …
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Design Methods for Remotely Powered Unmanned Aerial Vehicles
… and power requirements, the design matrix uses historical data to determine whether an internal combustion or electrical system would be most appropriate. Trends in the historical data show that the break in the design space between the two systems is around 30 miles and 1 kW. Electrical systems …
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Characterization of Pyranometer Thermal Offset and Correction of Historiacal Data
… gradient are established using nighttime data and subsequently used to estimate the offset during daytime. To correct historical data the thermal offset is related to other variables such as the output of a Precision Infrared Pyrgeometer (PIR) or the fraction of cloud cover in the sky. The …
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