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 9 of 9 for “"Location uncertainty"”.
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Propagation of Unit Location Uncertainty in Dense Storage Environments
… access the desired item, which results in item location uncertainty when asset tracking is insufficient. Given an initial certainty in item location, we use Markovian principles to quantify the growth of uncertainty as a function of retrieval requests and discover that the steady state …
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Design of a wearable ultrasound Doppler sensor to monitor blood flow in the common carotid artery
… this technology wearable mainly handling the location uncertainty of the artery and interpreting the measurement without human assistance with the restriction of keeping the technical complexity of the device low for all cases. The array of transducers is designed to enable the coverage of a …
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Sub-Millimetre Positron-Emission Particle Tracking Using a CdZnTe Semiconductor Array
… located in three-dimensional space with a radial location uncertainty of < 600 µm (68% coverage) and location rate of ≈ 0.3 Hz. A 68Ga source (160 µm diameter) with an activity of 1 MBq was located with a radial position uncertainty of < 800 µm (68% coverage) and location rate of ≈ 10 Hz. A 37 kBq …
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Double-Difference Seismic Event Relocation: A Study of the Applications and Limitations of the Relocation Problem
Earthquake relocation provides refined earthquake catalogs based on additional considerations or data beyond the initial earthquake location estimates. Double-difference relocation, in particular, utilizes the assumption that ray paths in close proximity to one another will pass through a similar …
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Methods for Validation of a Turbomachinery Rotor Blade Tip Timing System
… scanned and analyzed in CAD software with a tip location uncertainty of 0.1 mm. The BTT system agreed with the scanned results to within 0.13 mm. Tests were also conducted to ensure that the BTT system identified and indexed the blades properly. The second developed test method used an …
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Multicast outing protocols and architectures in mobile ad-hoc wireless networks
… services is to provide user-to-user, location independent communication services. The emerging group communication wireless applications, such as multipoint data dissemination and multiparty conferencing tools have made the design and development of efficient multicast techniques in …
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Coexistence of Wireless Networks for Shared Spectrum Access
… in cognitive radio (CR) networks and geolocation database services in database-driven spectrum sharing. The second problem is the main focus of this dissertation. To obtain a clear picture of coexistence issues, we propose a taxonomy of heterogeneous coexistence mechanisms for shared …
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An Information-Theoretic Examination of Next Generation Location Systems: The Role of LEOs, RISs and the Near Field
… due to the absence of atomic clocks, and uncertainty in satellite ephemeris data. To address these challenges, we leverage estimation theory and the Fisher Information Matrix (FIM) to establish theoretical bounds on localization performance. Our analysis shows that localization is possible …
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Impact of Uncertainties on Structures Damage Tolerance Parameters
<p>This research aims to enhance the understanding and management of aerospace structural integrity. Traditional fracture control methods, such as damage tolerance analysis (DTA), assume deterministic factors, considering uncertainties inherent in material properties, inspections, and operational …