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.
Results
Showing 1 to 20 of 441 for “"spurious"”.
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Bandpass filter design with spurious frequency reduction capability
… substrate is presented to suppress the first spurious of Parallel Coupled Microstrip Bandpass Filter (PCMBF). Band pass filters (BPF) are significant role in wireless communication systems. These filters present an undesired pass band at twice the design central frequency of the filter. The …
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High-Speed, Low-Spurious CMOS Analog -to -Digital Converter
Pipelining not only provides a speed advantage, but also enables the application of background offset trimming to folding ADCs. Background offset trimming with a delta-sigma modulator is applied to compensate the random input offset of folding amplifiers. A subranging front-end is used in …
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Towards externally valid machine learning: A spurious correlations perspective
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-08-01
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Low-Spurious Analog-to-Digital Conversion Using Multi-Stage Code-Error Calibration
… to implement a 15-bit, 5 Msample/s low-spurious ADC using 1.4 $\mu$m CMOS. A skip-and-fill algorithm with non-linear interpolation also opens up the possibility of calibrating ADCs in the background synchronously with their normal operations. Interpolation results for the background …
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Protecting Mobile Ad Hoc Networks from Spurious CTS Attacks 'Carrier Sensing based Deferral Mechanism'
… node randomly sends out a large number of spurious CTS frames in order to falsely block regular nodes in its neighborhood. Such an attack is termed as spurious CTS attack. In this thesis, we investigate the effects of such spurious CTS attacks and propose a solution to mitigate the problem. …
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Application of the spectral domain technique to discontinuity and spurious radiation problems in microwave circuits
… low frequencies is also developed. Fourth, the spurious radiation and scattering from arbitrarily shaped microstrip etches are analyzed using the spectral domain method. A parametric study is carried out to identify the worst-case scenario for radiation.
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A new constraint-based algorithm to learn Bayesian network structure from data: Control of Spurious Pairwise Information (CSPI)
… network structure from data, based on Control of Spurious Pairwise Information (CSPI). We limit the computational cost of learning by trading an increase in complexity of the initial steps for a substantial reduction in the complexity of conditional pairwise independence testing. We employ a …
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Functionals in electromagnetics: an investigation into methods to eliminate spurious solutions in the application of finite element techniques
… but have been handicapped by the appearance of spurious solutions. Both weighted residual methods and variational methods are the basic finite element techniques that are examined to establish a framework for the discussion of spurious solutions. A simple waveguide example is used to explore the …
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Design and implementation of L and X-band filters for the NeXtRAD front end
… ripple bandwidth of 210 MHz. The filter has a spurious-free window of 2050 MHz at -60 dB, with the first spurious approximately at 2.86 times the operating frequency. The return loss of the filter was 19.52 dB, and the insertion loss at mid-band was 0.14 dB. The measured filter agreed extremely …
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Mathematical and Physical Methods to Construct Approximately Neutral Surfaces
… the wrong direction. This thesis shows that the spurious advection through an ANS is another important consideration that limits the accuracy and usefulness of an ANS. Because of this concern, a two-dimensional approximately neutral surface is constructed called the Wu.s-surface, which minimizes …
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New strategies for low noise, agile PLL frequency synthesis
… frequencies with fast switching and minimal spurious and phase noise. The conflict between high resolution and fast switching leads to two separate integer synthesisers to satisfy critical system requirements. This thesis concerns a new sigma-delta fractional-N synthesiser design which is …
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Towards Understanding Human-aligned Neural Representation in the Presence of Confounding Variables
… This solution is more likely to pick up on spurious features and low-level statistical patterns in the train data rather than semantic features and highlevel abstractions, resulting in poor Out-of-Distribution (OOD) performance. In this project we aim to broaden the current knowledge …
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Analysis of the smoothed particle hydrodynamics method for free-surface flows
… and convergence. It is shown that SPH introduces spurious solutions dominant in the dynamics of the solution making quantities such as velocity and pressure essentially unusable without filtering. It is also shown that the method is consistent inside the domain but imposes spurious, leading order, …
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Injection, transport and detection of spin currents in organic semiconductors
… could distinguish spin pumping signal from other spurious effects. Our results from lateral spin pumping experiments expose drawbacks in the current device architecture and show no convincing proof of achieving spin current transport through PBTTT. Experiments with vertical spin pumping aimed at …
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Gallium Nitride phononic crystal resonator
… confine elastic vibrations with wide-band spurious mode suppression. A unique feature of the design demonstrated here is a folded PnC structure to relax energy confinement in the non-resonant dimension and to enable routing access of piezoelectric transducers inside the resonant cavity. …
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Protecting 802.11-Based Wireless Networks From SCTS and JACK Attacks
… In this thesis we investigate two attacks: Spurious CTS attack (SCTS) and Jamming ACK attack (JACK). In the SCTS, malicious nodes may send periodic Spurious CTS packets to force other nodes to update their NAV values and prevent them from using the channel. In the JACK, an attacker ruins …
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TOWARDS RELIABLE AI UNDER DISTRIBUTION SHIFTS: A DATA-CENTRIC PERSPECTIVE
Machine learning (ML) models often rely on spurious correlations in the training data, leading to performance degradation and unreliability when processing inputs under distribution shifts. This thesis systematically studies the robustness to distribution shifts for ML models from a data-centric …
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Rewriting the Rules of a Classifier
… existing classes to unseen variants, identify spurious correlations present in the dataset, mitigate the effects of spurious correlations, and introduce new classes. We find that our technique reduces the need for: computing resources, because we only re-train a single layer’s weights; new …
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Systemanalyse und Entwicklung Six-Port basierter Funkempfängerarchitekturen unter Berücksichtigung analoger Störeffekte
… signal processing. Thereby, issues of spurious interfering signals which are generated within the down conversion process of such receivers are of special interest. Based on a comprehensive description of the analog signal processing within additive frequency conversion, a reason could …
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