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 59 for “"Filter performance"”.
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On Ways to Improve Adaptive Filter Performance
Adaptive filtering techniques are used in a wide range of applications, including echo cancellation, adaptive equalization, adaptive noise cancellation, and adaptive beamforming. The performance of an adaptive filtering algorithm is evaluated based on its convergence rate, misadjustment, …
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Packet filter performance monitor (anti-DDOS algorithm for hybrid topologies)
… to change the states of firewalls based on their performance in a hybrid network. Both firewalls are connected inline. The monitor is mirrored to monitor the firewall states. The monitor reroutes traffic when one of the firewalls become overwhelmed due to a HTTP DDoS flooding attack. The monitor …
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Ash impacts on gasoline particulate filter performance and service life
… from gasoline powered LDVs. Particulate filters have been successfully implemented to reduce particulate emissions from diesel engine exhaust for over a decade. Diesel particulate filters have a demonstrated filtration efficiency of 95% or greater and have reduced diesel particulate mass …
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Measuring clay property variation and effects on ceramic pot filter performance
… country. Originally a distributor of ceramic pot filters (CPFs) manufactured in Accra, PHW began construction of a new factory outside of Tamale in late 2009 when it was recognized that importing filters from Accra was too inefficient to meet the demands for household water treatment and safe …
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Prediction of FIR pre- and post-filter performance based upon a visual model
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1986.
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Passive regeneration : long-term effects on ash characteristics and diesel particulate filter performance
Diesel particulate filters (DPF) have seen widespread growth as an effective means for meeting increasingly rigorous particle emissions regulations. There is growing interest to exploit passive regeneration of DPFs to reduce fuel consumption accompanying traditional active regeneration. …
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Spatial filter performance on point-target detection in various clutter conditions using visible images
… noise. Suppression of clutter uses a spatial filter matched to the target size. The goal of filtering is to reduce the spatial noise to the temporal noise limit. In this thesis, the detection performances of the Laplacian, Median, Robinson and Mexican Hat spatial filters were compared to …
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Modeling and interpreting the observed effects of ash on diesel particulate filter performance and regeneration
Diesel particulate filters (DPF) are devices that physically capture diesel particulates to prevent their release to the atmosphere. Diesel particulate filters have seen widespread use in on- and off-road applications as an effective means for meeting increasingly stringent particle emissions …
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An experimental and analytical exploration of the effects of manufacturing parameters on ceramic pot filter performance
Ceramic pot filters (CPF) are a promising low-cost option for household water treatment, providing a barrier of protection against-microbiological contaminants for households with or without reliable piped water supplies. The goal of this thesis is to provide CPF manufacturers with tools to …
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The influence of physical system parameters on the performance of adaptive filters for system identification of mechanical systems
… and nonrecursive least mean square adaptive filters were used to predict the output of various mechanical systems for a given input. The effects of quality factor (Q), dispersion and transmission time on adaptive filter performance were investigated. Optimal filter delay times and tap weight …
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Characterization and Cancellation of High-Frequency Parasitics for EMI Filters and Noise Separators in Power Electronics Applications
… of high frequency parasitic parameters in EMI filters. One chapter addresses the interaction between the power interconnects and the parasitic parameters in EMI filters. The last chapter addresses the characterization, evaluation and design of noise separators. Both theoretical and experimental …
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Monitoring and evaluation of the ceramic hemispheric filter in Northern Ghanaian households
… recipient of a 1,000-ceramic hemispheric water filter distribution, which was supplied by Pure Home Water (PHW) and funded by UNICEF-Ghana. The distribution to female heads of households began in November 2012, and approximately 700 ceramic hemispheric filters were disseminated by January 2013 …
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Connecting the Dots for People with Autism: A Data-driven Approach to Designing and Evaluating a Global Filter
… parts). The focuses are on 1) designing a global filter that can shift visual attention from local details to global features, and 2) evaluating the performance of a global filter by leveraging eye-tracking technology. This doctoral work manipulates visual stimuli in an effort to shift the visual …
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Fibre bragg gratings for microwave photonics and sensing
… on the fabrication of microwave transversal filters using fibre Bragg grating arrays and the building of fibre Bragg grating based magnetic-field sensors. Some theoretical background about fibre Bragg gratings, photosensitivity, fibre Bragg grating sensors and filters are presented. Fibre …
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Parametric design of an adaptive line enhancer for multiple switching tones in a correlated noise environment
… how a Fast Gradient approximation to a Lattice Filter can be used as an Adaptive Line Enhancer for sampled data consisting of multiple switching tones in correlated noise. A tradeoff analysis is performed with four methods of digital filtering including a conventional Digital Fourier Transform …
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Navigation analysis and design for Mars entry
… the state vector with an extended Kalman filter, which utilizes update information provided by the following measurement types: two-way range with orbiting satellites, two-way Doppler with orbiting satellites, two-way range with surface beacons, two-way Doppler with surface beacons, …
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Inductance cancellation techniques with application to EMI filters and components
… attenuation of high frequency signals in power filter networks. These limitations have generated recent interest in methods for compensating or mitigating parasitics to increase filter performance, including the use of coupled magnetic windings to cancel the effects of capacitor parasitic …
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Coupled-magnetic filters with adaptive inductance cancellation
Conventional filter circuits suffer from a number of limitations, including performance degradation due to capacitor parasitic inductance and the size and cost of magnetic elements. Coupled-magnetic filters have been developed that provide increased filter order with a single magnetic component, …
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Theory and fabrication of colloidal-crystal Bragg filters
… is developed for colloidal-crystal Bragg filters. The coupling constant, for coupled-wave equations, is derived to produce filter spectra. The spectra are modified by convolving with a Gaussian function to represent crystal defects. Scattering losses are calculated to attenuate the …
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Residue Number System Recursive Digital Filtering With Error Correction Capabilities
Residue number system (RNS) digital filters are obtained by encoding all filter arithmetic and signals in a residue number system, creating an architecture consisting of a set of parallel arithmetic operations. To prevent overflow, the design and realization of recursive RNS digital filters require …
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