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 108 for “"Acquisition time"”.
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Modeling Optimal Information Acquisition Time Driven by Event Importance for Decision Making: Integrating Gödel's Incompleteness, Turing's Computability, and Simon's Bounded Rationality
Στο πλαίσιο της λήψης αποφάσεων υπό συνθήκες αβεβαιότητας, η διαδικασία απόκτησης πληροφορίας διαδραματίζει κρίσιμο ρόλο στη βελτιστοποίηση των αποτελεσμάτων. Η παρούσα διπλωματική εργασία διερευνά τον βέλτιστο χρονισμό της απόκτησης πληροφορίας, ιδιαίτερα σε σενάρια όπου η σημαντικότητα των …
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Advanced techniques for fast offset cancellation limit amplifiers
… resulting in a 50x improvement in signal acquisition time to 20ns. A novel digital design reduces this acquisition time even further. Results were verified using behavioral and component-level simulators
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Weak GPS Signal Acquisition Using Antenna Diversity
GNSS Acquisition in fading and attenuated environments is challenging. In these situations, additional processing gain is required. A common method is to extend the coherent integration time. However, in weak signal situations, using only long coherent integration is limited by navigation data bit …
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Comparative analysis of iconic representation of select word processing functions with command string counterparts as a function of experience
… to study the effect of presentation format on acquisition time, recall, and preference. While the main focus was on the relative difference between iconic and textual representations, the independent variables include: presentation format (icon, text and mixed), experience (low, medium, and …
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Turbulent Separated Flow Over Wavy Surfaces
… technique for velocity and turbulence data acquisition. Time-averaged velocity, turbulent intensity, skewness, and flatness data are given.
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SIMULTANEOUS ARTIFACTS CORRECTION AND ACCELERATION FOR CHEMICAL EXCHANGE SATURATION TRANSFER IMAGING VIA DEEP LEARNING
… This method is effective, but takes long acquisition time, making it impractical for clinical applications. To address this challenge, I developed CEST MRI methods to achieve the following two goals: 1) to accelerate the acquisition time; and 2) to increase the CEST contrast quantification …
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Development of X-ray Coherent Scatter Projection Imaging Systems
… simultaneously measuring transmitted x rays. The acquisition time for a 5.0 cm × 9.0 cm object with 8425 pixels was 2.3 min. Use of continuous motion acquisition increases the width of image boundaries by the product of the object translation speed and the acquisition time per pixel. …
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Optimization of Multidimensional Nuclear Magnetic Resonance Spectroscopy, for Resolution and Sensitivity, Through Application of Radial Sampling
… with increased signal averaging require a longer acquisition time than is feasible. To overcome these limitations, radial sampling of the indirect dimensions of multidimensional experiments is utilized. It is demonstrated here, that through optimization of radial sampling acquisition parameters, …
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Microbubble localization using multivariate gaussian fitting for super-resolution ultrasound localization microscopy
… microbubbles, which elongates the overall data acquisition time for ultrasound localization microscopy. In this study, the multivariate Gaussian fitting (MGF) method is applied to achieve localization of spatially overlapping microbubble signals. The MGF-based localization technique provides a …
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SPREAD SPECTRUM SYNCHRONIZATION USING MATCHED FILTER AND CYCLIC ACCUMULATION
… popular technique over the decades. Code phase acquisition is a critical and difficult operation in any spread spectrum system. Acquisition must be accomplished within a short period of time and at low signal to noise ratio (SNR) in most communication environments. Conventional acquisition …
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A signal processing approach to ultrasound localization microscopy
… However, ULM has a fundamental trade-off between acquisition time and spatial resolution, which makes clinical translation challenging. In this thesis, in order to circumvent the trade-off, we pose the localization problem as a signal processing problem and introduce a filtering operation that is …
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Evaluation of roaming and download times in universal cellular/wireless LAN systems
… its roaming connection establishment acquisition time in different scenarios is evaluated. Specifically, the relationships between the roaming acquisition time and system resource blocking probability, mobile station resource blocking probability, packet successful transmission …
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The use of auditory prompts to direct drivers' attention to an in-vehicle visual display in a dual-task simulated commercial truck environment
… of using an auditory prompt to assist in target acquisition of in-vehicle navigational information, presented as a secondary task in commercial truck cab noise. Dual-task (driving in addition to performing a secondary task) and secondary task scenarios were presented, and acquisition time and …
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Acquisition and reconstruction methods for magnetic resonance imaging
… great versatility, MRI is limited by the long time required to acquire the data needed to form an image. Since a typical MRI protocol consists of multiple scans of the same patient, the total scan time is commonly extended beyond half an hour. During the session, the patient must remain …
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Signalakquisition in DS-Spreizspektrum-Systemen und ihre Anwendung auf den 3GPP-FDD-Mobilfunkstandard
Robust signal acquisition is an important task in DS-SS receivers. The objective of the acquisition is to coarsely estimate the signal parameters such that the succeeding parameter tracking algorithms can be initialized. In particular, acquisition is needed to coarsely synchronize the receiver to …
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Low-complexity structures for digital symbol timing recovery
… at symbol rate, at the precise sampling time instants in order to correctly recover the transmitted data. The major objective of this thesis is to present, analyze and prove feasibility of the new, low complexity, digital implementation structures for STR. The first presented digital …
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Model-based reconstruction of magnetic resonance spectroscopic imaging
… due to the inherently low SNR, such as long acquisition time and low spatial resolution. In this thesis, techniques that combine benefits from both model-based reconstruction methods and regularized reconstructions with prior knowledge are proposed and demonstrated for MRSI. These methods …
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Virtual matched filtering : a new hybrid CDMA code acquisition technique under Doppler and higher loads
A new technique for spreading code acquisition is presented. The technique utilizes a multiplicity of communication and processing techniques namely, concatenated short signature coding, Reed Solomon adaptive error/erasure decoding, and pipelining to provide the minimum possible acquisition time in …
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Fast magnetic resonance spectroscopic imaging using RF coil arrays
… both low signal-to-noise (SNR), as well as long acquisition times. The development of high-fidelity gradient coils has opened opportunities for fast k-space encoding schemes that are already used in structural imaging. At the same time, receive-coil arrays using 4 and 23 channels have been …
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A low phase noise ring oscillator phase-locked loop for wireless applications
… phase-frequency detector for accelerated acquisition time.
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