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Articles 1 - 12 of 12
Full-Text Articles in Physical Sciences and Mathematics
Exploring Discrete Cosine Transform For Multi-Resolution Analysis, Safdar Ali Syed Abedi
Exploring Discrete Cosine Transform For Multi-Resolution Analysis, Safdar Ali Syed Abedi
Computer Science Theses
Multi-resolution analysis has been a very popular technique in the recent years. Wavelets have been used extensively to perform multi resolution image expansion and analysis. DCT, however, has been used to compress image but not for multi resolution image analysis. This thesis is an attempt to explore the possibilities of using DCT for multi-resolution image analysis. Naive implementation of block DCT for multi-resolution expansion has many difficulties that lead to signal distortion. One of the main causes of distortion is the blocking artifacts that appear when reconstructing images transformed by DCT. The new algorithm is based on line DCT which …
Global Semantic Integrity Constraint Checking For A System Of Databases, Praveen Madiraju
Global Semantic Integrity Constraint Checking For A System Of Databases, Praveen Madiraju
Computer Science Dissertations
In today’s emerging information systems, it is natural to have data distributed across multiple sites. We define a System of Databases (SyDb) as a collection of autonomous and heterogeneous databases. R-SyDb (System of Relational Databases) is a restricted form of SyDb, referring to a collection of relational databases, which are independent. Similarly, X-SyDb (System of XML Databases) refers to a collection of XML databases. Global integrity constraints ensure integrity and consistency of data spanning multiple databases. In this dissertation, we present (i) Constraint Checker, a general framework of a mobile agent based approach for checking global constraints on R-SyDb, and …
New Correlation Effects In Nonrelativistic Atomic Photoionization In The High Energy Limit, Chieh Jen Yang
New Correlation Effects In Nonrelativistic Atomic Photoionization In The High Energy Limit, Chieh Jen Yang
Physics and Astronomy Theses
The effect of initial state correlation on high-energy dipole photoionization is considered and it is shown that for almost all atomic electron the asymptotic high-energy dependence is E-7/2, and the dominant transition is an ionization plus excitation satellite transition. This is demonstrated in numerical calculations of the photoionization of Ge4p2 1S and Sn 5p2 1S.
Developing A Modular Hydrogeology Ontology Extending The Sweet Ontologies, Ajay Tripathi
Developing A Modular Hydrogeology Ontology Extending The Sweet Ontologies, Ajay Tripathi
Geosciences Theses
Application of ontologies in the environmental science will allow experts in this field to model their domain knowledge for more efficient exchange and reuse. This thesis presents a modular approach in reengineering existing upper-level ontologies to conceptualize specific domain knowledge. The aim of extending these upper-level ontologies is to tailor and transform the existing conceptual models into new ones designed for the use in a specific domain in the earth sciences. This thesis extends the upper-level Semantic Web for Earth and Environmental Terminology (SWEET)ontologies to develop ontologies for part of the hydrogeology domain. The existing SWEET ontologies are developed by …
Analyzing The Combination Of Polymorphisms Associating With Antidepressant Response By Exact Conditional Test, Baofu Ma
Mathematics Theses
Genetic factors have been shown to be involved in etiology of a poor response to the antidepressant treatment with sufficient dosage and duration. Our goal was to identify the role of polymorphisms in the poor response to the treatment. To this end, 5 functional polymorphisms in 109 patients diagnosed with unipolar, major depressive disorder are analyzed. Due to the small sample size, exact conditional tests are utilized to analyze the contingency table. The data analysis involves: (1) Exact test for conditional independence in a high dimensional contingency table; (2) Marginal independence test; (3) Exact test for three-way interactions. The efficiency …
Rest Frame Variability Characteristics Of Blazars, John Patrick Mcfarland
Rest Frame Variability Characteristics Of Blazars, John Patrick Mcfarland
Physics and Astronomy Dissertations
Blazars exhibit the most extreme variability of the class of objects known asactive galactic nuclei (AGN). They are characterized by a featureless continuum, high polarization, and variability at all wavelengths and timescales. The amplitude of optical variations can range from less than 0.1 magnitude on the timescale of minutes to hours, to greater than 5.0 magnitudes on timescales of months to years, and gamma-ray variability amplitudes can span a range of as much as three orders of magnitude in a time-scale as short as a few days. These characteristics are consistent with a supermassive black hole accreting matter at the …
Spectral Line Synthesis For Hot Stars, Wenjin Huang
Spectral Line Synthesis For Hot Stars, Wenjin Huang
Physics and Astronomy Dissertations
I developed a spectrum synthesis method to investigate the physical properties of hot OB main sequence (MS) stars, which are often rapid rotators. The code realistically simulates the surface conditions of rapidly rotating stars, considering the rotationally-deformed stellar shape and gravity darkening effect. Comparing the synthesized absorption line profiles with the observed spectra of the member stars of 19 young Galactic clusters, I determined the projected rotational velocities of 496 stars. The average surface temperature and gravity for most of these objects were then derived from H$\gamma$ line fits. The polar gravity of each star was estimated as a good …
Scoresvg: A New Software Framework For Capturing The Semantic Meaning And Graphical Representation Of Musical Scores Using Java2d, Xml, And Svg, Geoffrey Alan Bays
Scoresvg: A New Software Framework For Capturing The Semantic Meaning And Graphical Representation Of Musical Scores Using Java2d, Xml, And Svg, Geoffrey Alan Bays
Computer Science Theses
ScoreSVG implements a three-tiered software architecture that generates musical scores in scalable vector graphics (SVG), something no other known music editor has done. SVG is non-proprietary XML-based format that renders graphical content into a web browser equipped with a SVG plugin. Scores in SVG can be scripted to produce interactive music theory examples, or make other graphical score changes impossible in any other format. Large music score editors such as Finale and Sibelius output to proprietary file formats, or Postscript (.ps) files that are not interchangeable or modifiable once created. Open source efforts such as LilyPond or Guido require the …
Ozone Damage Potential To Loblolly Pine Ecosystems In Metropolitan Atlanta, Georgia, Diane Marie Styers
Ozone Damage Potential To Loblolly Pine Ecosystems In Metropolitan Atlanta, Georgia, Diane Marie Styers
Geosciences Theses
Atlanta is one of the largest metropolitan areas in the southeastern United States and is the only area in the region currently listed in “serious” 1-hour ozone nonattainment. Despite its exceedance history, impacts on Atlanta’s urban forests have not been the focus of any major studies. The purpose of this study was to examine air pollution damage to vegetation using a foliar-injury survey on Stone Mountain. The objectives of this project included 1) establishing that pollution transport from Atlanta to Stone Mountain occurs, 2) determining the magnitude of ozone concentrations near Stone Mountain and 3) assessing sensitive plant species on …
Delay And Power Reduction In Deep Submicron Buses, Sharareh Babvey
Delay And Power Reduction In Deep Submicron Buses, Sharareh Babvey
Computer Science Theses
As technology scales down, coupling between nodes of the circuits increases and becomes an important factor in interconnection analysis. In many cases like the deep submicron technology (DSM), the coupling between lines (inter-wire capacitance) is strong and the energy consumption caused by parasitic capacitance is non-negligible. In this work, we employ the differential low-weight encoding [1] to reduce energy and delay (transmission cost) on DSM buses. We propose an enumeration method that reduces the encoder table-size from O(2n) words to O(n) words, for an n-bit DSM bus, and so reduces the memory complexity significantly and facilitates energy and delay reduction …
Continuous Late Pleistocene Paleoclimate Record From The Southwest African Margin: A Multi-Proxy Approach, Julia Keegan Shackford
Continuous Late Pleistocene Paleoclimate Record From The Southwest African Margin: A Multi-Proxy Approach, Julia Keegan Shackford
Geosciences Theses
Late Pleistocene sediments recovered from ODP Leg 175, Site 1085 are used to generate a high-resolution (500 yr) record of continental climate change in Southern Africa. The location of Site 1085, the SW African continental slope, provides a continuous hemipelagic section with a significant terrigenous component. Terrigenous sediments are transported via fluvial and/or eolian transport mechanisms with MIS 1 being dominated by eolian transport. Analyses, including grain-size, color reflectance, biogenic sediment geochemistry (%CaCO3, %TOC, and C/N), bulk sediment geochemistry, and clay mineralogy, are used to identify continental climate conditions in southern Africa. Analyses indicate glacial/interglacial variation. Median grain-size peaks are …
Provenance And Depositional History Of Late Pleistocene New Jersey Shelf Sediments, Roxie Jessica Turner
Provenance And Depositional History Of Late Pleistocene New Jersey Shelf Sediments, Roxie Jessica Turner
Geosciences Theses
Pleistocene New Jersey shelf sedimentology is strongly influenced by glacially driven sea level changes. A combination of regressive shoreline processes, subaerial exposure, fluvial downcutting, and deposition and reworking during transgression has influenced the NJ shelf sediment composition. Sediment provenance and transport history may be determined on a shelf environment through analysis of grain size distribution, heavy mineral content, magnetic mineral concentrations, and isotopic dating methods. A combination of surface grab and stratigraphic samples were analyzed within the study area. Relatively high percentages of heavy minerals were found in the 2 phi and 3 phi size fractions and hornblende grains provided …