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 24 for “"weak signal"”.
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Weak signal identification and inference in penalized model selection
Weak signal identification and inference are very important in the area of penalized model selection, yet they are under-developed and not well-studied. Existing inference procedures for penalized estimators are mainly focused on strong signals. This thesis propose an identification procedure for …
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Enhanced Weak Signal Detection Using SVM Based Correlation Algorithm
Traditional signal detection algorithms are often robust and are typically sufficient for high SNR data. However, the assumptions behind these methods begin to fall apart when signal period becomes either very short, or small in amplitude compared to any corruptive noise. To address this a kernel …
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Investigating weak signal of risk impacts on diversification to renewable energy: the case of British petroleum
Investigating weak signals of risk impacts on renewable energy diversification is critical in British petroleum projects and the renewable energy transition process. This research relates to the anticipated threats and risks in the ongoing British petroleum transition. With the recent shift in …
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The three-state-polarity-coincidence correlation detector
… superiority of the PCC' in the detection of a weak signal embedded in an additive noise over the PCC and other detectors is demonstrated. It is shown, particularly for certain Gaussian inputs, that there exists a maximum relative efficiency with respect to the dead zone width of clippers or the …
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Detection of a low power communication signal in the presence of a strong co-channel TV broadcast interference using Kalman filter
… on the detection of a low power communication signal in the presence of a strong co-channel television broadcast interference signal. The presence of strong co-channel interference makes the recovery of the desired weak power signal impossible using conventional filtering techniques that are …
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Direct position tracking in GPS using vector correlator
… the code and carrier of individual satellite signals and estimate the position and velocity of the receiver using trilateration. Different from this two-step approach, direct maximum likelihood estimation of position has proved to be beneficial in weak signal and multipath environments. In …
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Identification of Interfering Signals in Software Defined Radio Applications Using Sparse Signal Reconstruction Techniques
… as detecting the presence of interference in weak signal measurements. This thesis presents a new method for confirming the source of detected energy in weak signal measurements by sampling them directly, then estimating their expected effects. First, we assume that the detected signal is …
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Adaptive transmit beamforming for simultaneous transmit and receive
… transmit-side null at the receiver and extract a weak signal of interest from the received signal while simultaneously transmitting another signal at high power.
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Coded aperture imaging application in one-sided imaging of visually obscured objects
… utilizing high energy radiation. However, the signal produced by backscatter imaging is inherently weak, which makes in- terpretation di cult. One of the most promising techniques for recovering the weak signal is the coding and decoding provided by Coded Aperture Imaging (CAI). The purpose of …
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Driving Demands of a Successful Protest: A Comparative Analysis of Drivers That Leads To a Successful Outcome of Protest
… is a web of interconnected demands that sends a weak signal to policymakers or the intended target. I examine some of the drivers of protest that are likely to impact the chances of protesters demands being met either in part or in full. I further analyze how each of those variables produce the …
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Methods for imbalanced data in sports analytics: improving injury prediction models
… limited under extreme class imbalance and weak signal. Combining multiple prediction model forms and systematically increasing injury prevalence improves AUC, although injury prediction accuracy still requires further improvement. Overall, the findings aim to guide future work on …
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Coherent Mitigation of Radio Frequency Interference in 10-100 MHz
… resulting in no distortion of the underlying signals. This approach is of interest in weak signal applications such as radio astronomy, where the signal of interest may have interference-to-noise ratio much less than one, and so can be easily distorted by other methods. Environmental noise in …
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A Prototype Platform for Array Feed Development
… three-meter parabolic reflector by recovering a weak signal of interest that was obscured by a strong, broadband interferer. Similar results were also obtained when the interferer moved with an angular velocity of 0.1 degree per second, but only when the power in the interferer dominated the …
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Chemical Processes That Govern the Natural Attenuation of Microbial Signals: Environments That Simulate Photosynthetic Biofilms
… that is dependent on transmission of molecular signals through the environment. Complex molecular structures, including molecules used in microbial communication, are degraded in the environment through a manifold of reactions collectively referred to as 'natural attenuation.' Mechanisms of …
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Weak GPS Signal Acquisition Using Antenna Diversity
… the coherent integration time. However, in weak signal situations, using only long coherent integration is limited by navigation data bit transitions and receiver oscillator instability. Using non-coherent and differentially coherent integration mitigates the bit transition problem but has …
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Weak narrow-band signal detection in multivariate non-gaussian clutter
… of non-linear receivers for detection of weak narrow-band signals in multivariate non-Gaussian clutter. The novelty of the detection scheme lies in the utilization of both the complex measurement and the multivariate non-Gaussian character of the clutter. Two clutter models are developed …
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Correlating antisense RNA performance with thermodynamic calculations
… was increased. In addition, the YFP showed a weak signal compared to growth media, therefore the expression level was hard to be defined. Based on these results, a thermodynamic model to describe the relationship between the particular asRNA used and the observed expression level of the …
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Nonparametric detection of signals causing arbitrary changes in the accompanying noise backgrounds
<p>"The detection of signals in the presence of noise is an important problem in the field of communications. The detection problem is concerned with the design of systems which determine only the presence or absence of a signal which occurs with background noise. An example of considerable …
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Precise magnetic control of the supercurrent and fluxoids in nanodevices: Memory effects and diode effects
… to realize MZMs, but distinguishing the MZM signal is challenging due to the inherently weak signal and the presence of conventional states that coexist with MZMs. To address this issue, we fabricated Josephson junction arrays (JJAs) on TI films. JJAs provide an excellent platform for …
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Studies of fluorescent imaging for mRNA detection in living cells
… iNOS mRNA were synthesized and had shown FRET signal upon binding to the DNA target and in vitro transcribed iNOS mRNA in solution. The probes were delivered into living cells by hybridizing to their partially complementary DNAs and forming complexes with cSCK nanoparticles. Fluorescent images …
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