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 166 for “"Shadowing"”.
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Shadowing and numerical analysis of set-valued dynamical systems
In this PhD thesis, shadowing theory is systematically generalized to set-valued discrete-time dynamical systems. In particular, a notion of hyperbolicity is proposed and the corresponding shadowing and inverse shadowing theorems are proved. Explicit error estimates for the Viability Kernel …
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Shadowing practices: Ethnographic accounts of private eyes as entrepreneurs
… and interviewed an additional 25. Because shadowing is an emergent methodology, an in-depth discussion of conducting and writing shadowing research is provided. As noted in this discussion, it is important that writing remain primarily descriptive yet linked to dominant contemporary …
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Speaking while listening: Language processing in speech shadowing and translation
Contains fulltext : 233349.pdf (Publisher’s version ) (Open Access)
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Least Squares Shadowing for sensitivity analysis of chaotic dynamical systems
… A recently developed method, Least Squares Shadowing or simply LSS, tackles this problem and proposes an alternative approach to compute the desired sensitivities. The results are very promising and this thesis is intended to lay the mathematical foundations of this new algorithm. A latter …
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‘Through the patient’s eyes’: shadowing patients at the end of life
… and to improve patients’ experience of care. Shadowing is an experiential technique intended to enable healthcare staff to collect information in a way which will aid them to understand the experience of care from the patient’s perspective. It has been introduced recently to quality …
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Effect of correlation between shadowing and shadowed points in rough surface scattering
Shadowing of random surfaces is accounted for by multiplying the Kirchhoff electric current density by a shadowing function. The shadow-corrected incoherent intensity is computed in the backscatter direction and is found to be proportional to the probability of a specular point being illuminated …
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Sensitivity analysis on chaotic dynamical systems by Non-Intrusive Least Squares Shadowing (NILSS)
… thesis develops the Non-Intrusive Least Squares Shadowing (NILSS) method, which computes the sensitivity for long-time averaged objectives in chaotic dynamical systems. In NILSS, we represent a tangent solution by a linear combination of one inhomogeneous tangent solution and several homogeneous …
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Least Squares Shadowing for sensitivity analysis of large chaotic systems and fluid flows
… A recently proposed method, Least Squares Shadowing (LSS) presents a promising alternative that avoids the break down encountered by conventional sensitivity analysis approaches. However, LSS has some issues, including high computational costs and a lack of robustness to certain errors. The …
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Received Signal Strength-Based Localization of Non-Collaborative Emitters in the Presence of Correlated Shadowing
… localization in the presence of correlated shadowing with no knowledge of the emitter's reference power. A new non-linear least squares (NLS) DRSS location estimator that uses correlated shadowing information to improve performance is introduced. The existing maximum likelihood (ML) …
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Development of a numerical technique for modelling of multi-stage hydraulic fracturing in shale reservoirs
… the stress field changes, referred to as “stress shadowing”. In this dissertation, in order to present a numerical technique, which is capable of capturing the non-planar hydraulically driven crack propagation with unpredictable path, on one hand, and tackling the feasible emergence of multiple …
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Vector boson production with the ALICE detector
… include isospin, Fermi motion, EMC effect, shadowing and nuclear absorption. Hence their production in lead-lead (Pb-Pb) and proton-lead (p-Pb) collisions can be used to test some of these initial state effects. In this thesis only two of these initial state effects will be considered …
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Propagation modeling for land mobile satellite communications
… occurs due to multipath effects and vegetative shadowing. A review of the literature was performed to study these propagation impairments. Available experimental data are examined, compared, and summarized. Propagation through vegetation is studied in order to compare reported modeling efforts …
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An efficient algorithm for sensitivity analysis of chaotic systems
… recent approaches, including ensemble-based and shadowing-based methods are either computationally impractical or lack convergence guarantees. We propose a novel alternative known as space-split sensitivity or S3, which evaluates linear response as an efficiently computable, provably convergent …
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Análise e simulação de um sistema de equações químicas do tipo difusão-reação
… de Sobolev, e para estimar o erro global usamos shadowing finito a posteriori. Os resultados computacionais obtidos mostram que o comportamento da solução está dentro do esperado e concorda com resultados da referências. Assim mesmo as estimativas do erro local e global são obtidas para pequenos …
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Indoor Propagation Modeling at 2.4 GHz for IEEE 802.11 Networks
… model and standard deviations from log-normal shadowing, which statistically describe the path loss models for a different transmitter receiver separations and scenarios, are determined. The purpose of this study is to characterize the indoor channel for 802.11 wireless local area networks at …
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High-frequency electromagnetic wave scattering from rough surfaces
… between the irregularities of the surface (i.e., shadowing and multiple scattering are accounted for). In addition, the SBR technique is more efficient than the Method of Moments (MoM) solution, because it does not involve matrix equations, which makes solving the full three-dimensional problem …
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Series interconnected solar cells and solar cells with integrated bypass diode
… solar cell module can be seriously affected by shadowing of a solar cell in a series connected array. The shadowing can not only reduce power out of all proportion to the size of the shadow, but can cause a complete module failure. The problem can be overcome by connecting a bypass diode across …
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Application of Modeling Methodologies to Improve an Emergency Departments Workflow
… research involved collecting data through job shadowing of human entities at the Phelps Health Emergency Department in Rolla, Missouri. This approach helped identify issues affecting patient flow and wait times. A Model Based Systems Engineering model was developed to represent and understand …
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Kinetic Roughening During Hot-Wire Chemical Vapor Deposition of Hydrogenated Amorphous Silicon
… the surface morphology is shaped by geometric shadowing of growth particles and thermally-activated smoothening mechanisms. For films grown at low temperature, the local slope of the surface is found to exhibit power law scaling with time that is consistent with anomalous roughening behavior …
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Improving Bluetooth-based Indoor Positioning Using Vision and Artificial Networks
… (RSSI) fluctuations caused by human body shadowing. This thesis presents methods to compensate for losses in the RSSI values by applying ANN algorithms to RSSI measurements from three BLE advertising channels. The resulting improved RSSI values are then converted into ranges using path …
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