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 20 of 118 for “"Time model"”.
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Develop a Supercapacitor Real Time Model for PHIL Simulation
… (HIL) and power-hardware-in-the-loop (PHIL) real time simulations are among the most reliable methods for ensuring generation and storage can meet load demands in real time, because it is executed physically rather than as a purely computational exercise. My research is focused on developing …
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Simulation Comparisons of Semi-Parametric Accelerated Failure Time Model With Different Bandwidths
<p>The proportional hazards (PH) model and the accelerated failure time (AFT) model are the most popular models to fit the censoring data. Sometimes, the PH assumption cannot be satisfied, and therefore, the AFT model becomes a useful alternative to the PH model. Comparing with the least square …
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A real time model of nitrogen-cycle dynamics in an estuarine system.
Thesis: Sc. D., Massachusetts Institute of Technology, Department of Civil Engineering, 1975
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A Hydrothermal After-ripening Time Model of Seed Dormancy Loss in Bromus tectorum
… potential, one of the parameters of hydrothermal time. The rate of change of the mean base water potential is assumed to be a linear function of temperature above a specific base temperature and as a result can be described by a thermal after-ripening (TAR) time model, an extension of hydrothermal …
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Random Effects Selection In Bayesian Accelerated Failure Time Model With Correlated Interval Censored Data
… collect multiple observations per subject, the time to an event is often of interest. Sometimes, the occurrence of the event can be recorded at regular intervals leading to interval censored data. It is further desirable to obtain the most parsimonious model in order to increase predictive power …
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Capacity expansion and capital investment decisions using the Economic Investment Time Model: a case oriented approach
… in capacity planning. The Economic Investment Time (EIT) Model is a tool that enables planners to accurately determine the investment time in which profits resulting from the proposed expansion can be maximized. This thesis presents the results yielded by the EIT. Validation is performed using …
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Quantile Regression With Censored Data
… Kaplan-Meier; the Cox Proportional Hazards Model; Accelerated Failure Time Model.
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Continuous-time multivariable system identification
… we consider the identification of continuous-time multivariable systems. Direct methods of identification, i.e. identifying a continuous-time model directly from samples of input-output data, are considered briefly. Of primary consideration is the indirect method of identification, which can …
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Design and implementation of a sector-based airspace model for the MIT Extensible Air Network Simulation
… of the simulation, the determination of flight times, has received criticism from the MEANS users as being too simplistic for their needs. Currently, MEANS predicts flight times based on a historical distribution of observed flight times between city pairs. This system ignores the effects of …
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Noise -Tolerant Digital System Design
… performance in high-speed I/O links. A discrete-time model that comprehends both transmit and receive jitter is presented. Typical I/O channels are shown to amplify high-frequency transmit jitter limiting the performance of equalization and multilevel signaling schemes. Design techniques to …
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Visualization of spatio-temporal data in two dimensional space
… data is becoming very popular in the recent times, as there are large number of datasets that collect both location and temporal information in the real time. The main challenge is that extracting useful insights from such large data set is extremely complex and laborious. In this thesis, we …
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Exact non-equilibrium solutions of the Einstein-Boltzmann equations
… of the Boltzmann equation, with a relaxation-time model of collisions, to find solutions of the Einstein-Boltzmann system of equations. A covariant harmonic decomposition of the distribution function is used to obtain exact results. The conditions imposed by the conservation of particle number …
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A comparison of methods for analysing interval-censored and truncated survival data
… data: the Cox proportional hazards model (Cox, 1972), the Buckley-James regression model (Buckley and James, 1979) and the accelerated failure time model. These models are extended to incorporate the analysis of interval-censored and left-truncated data. The models are compared in an …
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A risk-based maintenance methodology of industrial systems
… whilst reducing the costs associated with downtime in addition to eliminating failure of equipment. The goal of maintenance, like all other functions of any manufacturing company, must be a cost effective activity. Consequently, it becomes essential for a company to develop a cost effective …
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Germination thresholds of the Mixed-grass Prairie species as affected by global climate change: A FACE study.
… 15/5, 20/10, 25/15, 30/20, 35/25°C). Thermal time requirements (θ50) and base temperatures (Tb) for germination were determined using thermal time models. Elevated CO2 concentrations reduced seed fill and viability, germination and germination rate in Grindelia squarrosa. Heating increased …
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Inference and Estimation in Change Point Models for Censored Data
… of a change in distribution for a set of time-ordered observations. This has applications in a large variety of fields and can also apply to survival data. With improvements to medical diagnoses and treatments, incidences and mortality rates have changed. However, the most commonly used …
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Design of a battery charger for the NASA EOS space platform
… and analysis was facilitated by use of the model for the pulse-width-modulated (PWM) switch and the new continuous-time model for current-mode control. Analyses of the battery charger small-signal behavior are compared to hardware measurements to verify modeling accuracy.
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Impact Of Time-Varying And Time-Invariant Measures Of Adherence To Secondary Prevention Therapies Post-Acute Myocardial Infarction: An Application Of Marginal Structural Models (MSMS)
… risk of cardiovascular events by using time-invariant and time-varying measures of adherence. The effectiveness of both measures in predicting a (i) recurrent AMI, and (ii) mortality using various mathematical models and statistical techniques was compared. Time dependent confounding was …
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Development of hydrograph-based approach to modeling fate and transport of sediment-borne bacteria in lowland rivers
… plans like Total Maximum Daily Loads, no single model has been widely recognized as an efficient and effective tool for estimating fecal pollution. This dissertation develops a simple yet effective modeling approach, called Hydrograph-based Approach, to bacterial fate and transport modeling in …
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Essay 1. Equity Style Identification. Essay 2. Equity Fund Performance Evaluation: The Importance of Fund Style. Essay 3. A Dynamic Model of Mutual Fund Managers' Investment Strategies
The third essay presents a continuous time model to describe the optimal investment strategy of money managers. A manager seeks the optimal skill level that has the best trade-off between the portfolio's expected return and its volatility of tracking error. When the time is close to the end of the …
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