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 75 for “"trajectory analysis"”.
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Optimization and Trajectory Analysis of Morphing Waveriders
… range was evaluated using a direct collocation trajectory optimization algorithm. While the analytical model and CFD tool predicted similar performance trends, the CFD based method was better suited to capture the complex features experienced by round-leading edge morphing waveriders. For both …
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Trajectory Analysis for Event Detection in Ambient Intelligence Applications
… application domains would benefit of such an analysis, from context-aware computing, to area monitoring and surveillance, to assistive technologies for elderly or disabled, and more. In a broad sense, we can define the activity analysis as the problem of finding an explanation coherent with a …
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State-Trajectory Analysis and Control of LLC Resonant Converters
… that, a simplified implementation of the optimal trajectory control is proposed to significantly improve the load transient response: the new steady state can be tracked in the minimal period of time. With the advantages of the state-trajectory analysis and digital control, the LLC soft start-up …
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Dynamic and Static Correlates of Adolescent Physical Activity: A Latent Trajectory Analysis
… obesity among today’s youth. Understanding the trajectory of change in physical activity and the influences of change has potential for informing future interventions and policy. </p><p>PURPOSE: The purpose of this research was to examine trajectories of physical activity across adolescence and …
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Interplanetary trajectory analysis for 2020-2040 Mars missions including Venus flyby opportunities
… trajectories with Venus flybys. Using the trajectory programs developed in this work, we investigate the relation between departure and arrival dates and energy required for the transfer trajectories. The contours of C3 or [delta]Vtot for a range of departure dates and times of flight would …
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Mission design and trajectory analysis for inspection of a host spacecraft by a microsatellite
The trajectory analysis and mission design for inspection of a host spacecraft by a microsatellite is motivated by the current developments in designing and building prototypes of a microsatellite inspector vehicle. Two different, mission scenarios are covered in this thesis - a host spacecraft in …
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Determinants of Nonrecovery Following Hip Fracture in Older Adults: a Chronic Disease Trajectory Analysis
… who do not fully recover. A chronic disease trajectory framework guided the theoretical design of the research. Data were collected from the medical records of 102 persons aged 60 years and older who sustained a proximal hip fracture from 1993 to 1998 at a medical center in North Carolina. …
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A numerical model study about the impacts of dry air on tropical cyclone formation
… upper-level dry air intrusion. Backward trajectory analysis and water budget analysis show that vertical transport of dry air from the upper troposphere, where a well-defined wave pouch is absent, contributes to mid-level drying near the pouch center and the non-development of ex-Gaston. …
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Orbit determination using modern filters/smoothers and continuous thrust modeling
… The BSEKF was implemented in the R&D Goddard Trajectory Determination System (GTDS) for this thesis while the ESKF was implemented in 1981 and has been tested extensively since then. Radar and optical satellite tracking observations were simulated using an initial truth orbit and were …
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MULTIVARIATE FINITE MIXTURE GROUP-BASED TRAJECTORY MODELING WITH APPLICATION TO MENTAL HEALTH STUDIES
… two kinds of methods are applied in trajectory analysis: 1) hierarchical modeling based on a multilevel structure, or 2) latent growth curve modeling (LGCM) based on a covariance structure (Raudenbush & Bryk, 2002; Bollen & Curran, 2006). However, this thesis used a third trajectory …
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Pitch-Control Predictor-Corrector and Neural Network Ascent Guidance
… flight path angle. Three degree-of-freedom trajectory analysis is performed using the Program to Optimize Simulated Trajectories (POST2). Results of Monte Carlo simulations including uncertainties in atmosphere, thrust, aerodynamics and initial state are presented and compared to …
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Single molecule tracking studies of lower critical solution temperature transition behavior in poly(N-isopropylacrylamide)
… when organized into two categories- SMT trajectory analysis techniques and SMT results in pNIPAAm. In the first category, four techniques for analyzing SMT data – confinement level analysis, time series analysis and statistical analysis of lateral diffusion, multistate kinetics, and a …
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Identifying Dry Intrusion Outflows in Present and Future Climates with Machine Learning
… Currently, DIs are identified with Lagrangian trajectory analysis, which has enabled studies into the climatology, variability, and characteristics of these airstreams. However, the future of DIs, and the impact of climate change on them, is currently unexplored due to the computational and …
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Identification of a vascular smooth muscle cell transition associated with fibrous cap formation and induced by thrombin receptor activation
… formation through VSMC regulation. Computational trajectory analysis inferred that this fibrous cap-associated VSMC (fcVSMC) state is derived from a plastic intermediate VSMC population marked by Ly6a/SCA1, Vcam1 and Lgals3 expression – a population that I term “intermediate modulated VSMCs” …
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The Geography of Juvenile Crime Place Trajectories
… studies in Seattle, Washington, that used trajectory analysis to identify temporal changes in crime at street blocks over a fourteen-year time period. Specifically, this research used a variety of spatial techniques to describe the distribution of the street blocks in each trajectory and …
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Quality of Life After Prostate Cancer Diagnosis: A Longitudinal Prospective Cohort Study in Alberta, Canada
… to those who were non-exercisers. In the trajectory analysis, three physical and three mental trajectory groups were identified. CONCLUSION: With additional research, these established trajectory groups may help healthcare professionals in improving treatment and follow-up for this …
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Transport of soft materials in crowded environment
… going beyond traditional particle tracking and trajectory analysis, it was discovered that for protein transportation rather than directing the protein-containing endosomes steadily towards intended destination with regulatory mechanisms as commonly believed, efficient random search is an …
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Sequential sampling and analysis of precipitation in the Shenandoah Valley
… reports the results obtained from the rainwater analysis precipitation at and this the determination rural site is of whether the acidic or not. Rainwater collection was conducted sequentially and on an event basis from October 1982 to January 1983. Trajectory analysis was performed for each …
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Microcontroller (MCU) Based Simplified Optimal Trajectory Control (SOTC) for High-Frequency LLC Resonant Converters
… of the resonant tank. This paper employs state-trajectory analysis to describe and analyze the behavior of the resonant tank. Control methods based on state-trajectory analysis were used to solve the challenges in the control of the LLC resonant converter, including unpredictable dynamics, burst …
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Social news web-sites with democratic interfaces : analysis of one month’s voting from Reddit.com.
… most likely to submit popular content. Latent trajectory analysis was also employed to look for patterns to the temporal distribution of votes on Links. The potential for quantitative democratic interfaces to facilitate communication between large groups of people is discussed; and some …
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