Digital Commons Network^™

Discovering Regularity In Point Clouds Of Urban Scenes, Sam Friedman

Dissertations, Theses, and Capstone Projects

Despite the apparent chaos of the urban environment, cities are actually replete with regularity. From the grid of streets laid out over the earth, to the lattice of windows thrown up into the sky, periodic regularity abounds in the urban scene. Just as salient, though less uniform, are the self-similar branching patterns of trees and vegetation that line streets and fill parks. We propose novel methods for discovering these regularities in 3D range scans acquired by a time-of-flight laser sensor. The applications of this regularity information are broad, and we present two original algorithms. The first exploits the efficiency of …

Planar Waveguide Structures For Post-Edfa Broadband Near Infrared Optical Amplifiers, Islam Hoxha

Dissertations, Theses, and Capstone Projects

This thesis reports on optical gain of up to 5.7 dB from a planar waveguide with core made of tetravalent chromium-doped calcium germanate single crystal.

Roundup Ready Nation: The Political Ecology Of Genetically Modified Soy In Argentina, Amalia Leguizamon

Dissertations, Theses, and Capstone Projects

This dissertation is a case study of agrarian transformation in an agro-export society, Argentina. I study the process of adoption of the technological package of genetically modified (GM) soy in the Argentine countryside, its socio-ecological consequences, and Argentines' responses to it. In particular, this research addresses Argentina's unique situation of being a developing country that has positively embraced the biotechnology of GM seeds as a key accumulation strategy without the emergence of major contestation against GM soy monocropping. In order to answer the puzzle of quiescence, I look at how power relations structure access to social and environmental goods and …

Analysis Of Dna Motifs In The Human Genome, Yupu Liang

Dissertations, Theses, and Capstone Projects

DNA motifs include repeat elements, promoter elements and gene regulator elements, and play a critical role in the human genome. This thesis describes a genome-wide computational study on two groups of motifs: tandem repeats and core promoter elements.

Tandem repeats in DNA sequences are extremely relevant in biological phenomena and diagnostic tools. Computational programs that discover tandem repeats generate a huge volume of data, which can be difficult to decipher without further organization. A new method is presented here to organize and rank detected tandem repeats through clustering and classification. Our work presents multiple ways of expressing tandem repeats using …

Emerging Musical Structures: A Method For The Transcription And Analysis Of Electroacoustic Music, Mario Mazzoli

Dissertations, Theses, and Capstone Projects

This dissertation proposes a method for transcribing "electroacoustic" music, and subsequently a number of methods for its analysis, utilizing the transcription as main ground for investigation. The core of the investigation is on pieces that seem particularly resistant to traditional musical analysis, as they present at least three crucial differences with respect to the "standard" repertoire: they utilize (completely or in part) non-pitched sounds, they focus on timbre avoiding traditional strategies of pitch and rhythm organization, and they are not traditionally notated. Pieces by Agostino di Scipio and Douglas Henderson serve as case studies to demonstrate the efficacy of the …

Reliability-Based Progressive Collapse And Redundancy Analysis Of Bridge Systems, Feng Miao

Dissertations, Theses, and Capstone Projects

Highway bridges like most structural systems are usually designed on a member by member basis and little consideration is provided to the effect of a local failure on system safety. There are concerns that some systems optimized to meet code-specified member design criteria may not provide sufficient levels of structural redundancy to withstand a possible local failure. In fact, a local failure of one structural element may result in the failure of another element creating a chain reaction that might progress throughout the whole structure or a major portion of it leading to a catastrophic collapse. Several recent catastrophic structural …

The Characterization Of Pb2+ Toxicity In Rat Neural Development: An Assessment Of Pb2+ Effects On The Gaba Shift In Neural Networks And Implications For Learning And Memory Disruption, Lorenz Simon Neuwirth

Dissertations, Theses, and Capstone Projects

The toxic effects of Pb2+ on the developing rat nervous system has been investigated to assess early developmental GABAergic disruption and its implications with altering inhibitory learning and memory. This goal was achieved using a multi-systems approach: blood lead levels (clinical physiology), qRT-PCR (molecular genetics), brain and primary neuronal culture immunology (immunohistochemical and cellular approaches), physiological cellular components (synaptosomes and protein expression) and finally through learning and memory assessment with GABA mimetic drug manipulations in the intact animal (behavioral pharmacology). The influence of a 956ppm Pb2+ gestational diet (i.e. from birth to sacrifice) resulted in pup mean blood lead levels …

A Structural Approach To The Analysis Of Rock Music, Drew F. Nobile

Dissertations, Theses, and Capstone Projects

This dissertation situates itself in the middle of an ongoing debate about the applicability of Schenkerian analytical techniques to the analysis of pop and rock music. In particular, it investigates ways in which the standard conceptions of voice leading, harmonic function, and counterpoint may be updated to better apply to this new repertoire. A central claim is that voice-leading structure is intimately related to formal structure such that the two domains are mutually informing.

Part I of the dissertation focuses on harmonic and melodic theory. Chapter 2, "Harmonic Syntax," advocates for a conception of harmonic function based on syntax and …

Strategies For Discriminating And Comparing Unknown Unitary Transformations, Guy F. Okoko

Dissertations, Theses, and Capstone Projects

How to discriminate or compare two unitary transformations that are completely unknown?

We first examine the unambiguous discrimination of two unknown unitary transformations; we show that the results are the same as those found for the programmable discrimination of two unknown quantum states.

Next we consider the minimum-error comparison of two unknown unitary transformations; the results are obtained in the general case where the prior probabilities are different.

Last we study the unambiguous discrimination of two unknown unitary transformations in the case where multiple copies of data are available.

Long-Term Warming And The Size And Phenology Of Long Island Sound Plankton, Edward Rice

Dissertations, Theses, and Capstone Projects

In coastal ecosystems with decades of eutrophication and other anthropogenic stressors, the impact of climate change on planktonic communities can be difficult to detect. A time-series of monthly surface water temperatures in the Central Basin of Long Island Sound (LIS) from the late 1940s until 2012 indicates a warming rate of 0.03°C per year, with recent summer temperatures increasing most consistently. During this warming trend, the proportion of chlorophyll produced by smaller phytoplankton and flagellates appears to be higher during warmer summer and fall months, enabling an increase in annual chlorophyll despite static nutrient levels. The phenology of phytoplankton and …

Existence: An Unholy Trinity. An Account Of Indeterminate Existence, Salas Sanchez-Bennasar

Dissertations, Theses, and Capstone Projects

What is it for something to exist? This dissertation provides an answer to this question by giving a philosophical theory of existence in which the concept of existence in understood as a complex tri-partite notion. The account of existence defended here is arrived at by taking into consideration past philosophical theories of existence, the everyday and scientific uses of the notion, and also philosophical considerations about the nature of reality.

There are three conditions that are central to existence: spatiotemporality, mind-independence, and being a member of the quantificational domain of a true and complete scientific description about the world. To …

Measuring The Transmission Matrix For Microwave Radiation Propagating Through Random Waveguides: Fundamentals And Applications, Zhou Shi

Dissertations, Theses, and Capstone Projects

This thesis describes the measurement and analysis of the transmission matrix (TM) for microwave radiation propagating through multichannel random waveguides in the crossover to Anderson localization. Eigenvalues of the transmission matrix and the associated eigenchannels are obtained via a singular value decomposition of the TM. The sum of the transmission eigenvalues yields the transmittance T, which is the classical analog of the dimensionless conductance g. The dimensionless conductance g is the electronic conductance in units of the quantum conductance, G/(e^2/h).

For diffusive waves g>1, approximately g transmission eigenchannels contribute appreciably to the transmittance T. In …

Special Representations, Nathanson's Lambda Sequences And Explicit Bounds, Satyanand Singh

Dissertations, Theses, and Capstone Projects

{Let $X$ be a group with identity $e$, we define $A$ as an infinite set of generators for $X$, and let $(X,d)$ be the metric space with word length $d_{A}$ induced by $A$. Nathanson showed that if $P$ is a nonempty finite set of prime numbers and $A$ is the set of positive integers whose prime factors all belong to $P$, then the metric space $({\bf{Z}},d_{A})$ has infinite diameter. Nathanson also studied the $\lambda_{A}(h)$ sequences, where $\lambda_{A}(h)$ is defined as the smallest positive integer $y$ with $d_{A}(e,y)=h$, and he posed the problem to compute $\lambda_{A}(h)$ and estimate its growth rate. …

Automated Learner Classification Through Interface Event Stream And Summary Statistics Analysis, Edgar E. Troudt

Dissertations, Theses, and Capstone Projects

Reading comprehension is predominately measured through multiple choice examinations. Yet, as we will discuss in this thesis, such exams are often criticized for their inaccuracies. With the advent of "big data" and the rise of ITS (Intelligent Tutoring Systems), increasing focus will be placed on finding dynamic, automated ways of measuring students' aptitude and progress.

This work takes the first step towards automated learner classification based on the application of graphic organizers. We address the following specific problem experimentally: How effectively can we measure task comprehension via human translation of written text into a visual representation on a computer? Can …

Xenakis In America, Charles Wolcott Turner

Dissertations, Theses, and Capstone Projects

Iannis Xenakis had a long-standing interest in the U.S., but given the five years he spent here, little has been written about his experiences. This study attempts, through archival research and interviews, to document Xenakis’ time in the United States. Its subject is his relationship to American cultural institutions, and in what lured Xenakis here for musical composition and research.

The narrative treats the period from Copland’s invitation to Tanglewood in 1963, through Xenakis’ 1972 investment by France as a state-supported artist. While he visited the U.S. many times thereafter, he no longer sought long-term engagement with U.S. institutions, but …

Phylogeny And Population Genetics Of The Endangered Dwarf Bear-Poppy, Arctomecon Humilis Coville (Papaveraceae) Using Microsatellite Markers, Joshua Simpson

Dissertations, Theses, and Capstone Projects

The genus Arctomecon (Papaveraceae) is comprised of three narrowly endemic rare species that are largely restricted to gypsum soils of the eastern Mojave Desert. The small, remaining populations of these species have become increasingly isolated by urban development and habitat fragmentation. Arctomecon humilis is federally listed as endangered due to its limited distribution within a ~15 km radius of an actively expanding city. Organizations involved with land management and conservation have called for greater insight into the genetic variation and population structure of the remaining subpopulations as they make important decisions regarding where to focus their efforts and resources.

The …

Organic Pi-Stacking Semiconducting Material: Design, Synthesis And The Analysis Of Structure And Properties, Bin Wang

Dissertations, Theses, and Capstone Projects

Organic semiconducting materials have been under intensive investigation in the recent decades for potential applications in various electronic or optoelectronic devices such as light emitting diodes, photovoltaic cells and field effect transistors. Compared to inorganic counterparts, organic charge transport materials are attractive for their abilities of forming thin-films, large area manufacturing, compatibility with flexible substrate, light weight and potential low fabrication cost. The charge transport property of the organic active layer is one of the key factors to the electronic or optoelectronic performance of devices. Research projects presented in this thesis focused on improving charge carrier mobility of organic charge …

An Experimental Investigation Into The Mechanisms Of Bacterial Evolution, Zhenmao Wan

Dissertations, Theses, and Capstone Projects

This thesis studies the two fundamental mechanisms of bacterial evolution — horizontal gene transfer and spontaneous mutation, in the bacterium Escherichia coli through novel experimental assays and mathematical simulations. First, I will develop a growth assay utilizing the quantitative polymerase chain reaction (qPCR) to provide real-time enumeration of genetic marker abundance within bacterial populations. Second, I will focus on horizontal gene transfer in E. coli occurring through a process called conjugation. By fitting the qPCR data to a resource limited, logistic growth model, I will obtain estimated values of several key parameters governing the dynamics of DNA transfer through conjugation …

On Becoming A Teacher (Or Not): Students Of Color's Perceptions Of Teachers' Work, Consideration Of Teaching As A Career, And Implications For Diversifying The Teaching Force, Amanda Lee Winkelsas

Dissertations, Theses, and Capstone Projects

The racial/ethnic demographics of the American public school teaching force stand in contrast to the racial/ethnic demographics of the students and families who are served by our public school system. In an effort to understand the racial/ethnic demographic disparities between the teaching force and the public school student population, this study explores the perceptions of students of color as they relate to teachers' work, authority, and power. Utilizing a participatory, mixed methods approach in one public, urban, college preparatory school, I analyze the experiences, cultural models, and knowledges that shape students' perceptions of teachers' work and their own consideration of …

A Parametrization-Based Surface Reconstruction System For Triangular Mesh Simplification With Application To Large Scale Scenes, Adriana Wise

Dissertations, Theses, and Capstone Projects

The laser scanner is nowadays widely used to capture the geometry of art, animation maquettes, or large architectural, industrial, and land form models. It thus poses specific problems depending on the model scale. This thesis provides a solution for simplification of triangulated data and for surface reconstruction of large data sets, where feature edges provide an obvious segmentation structure. It also explores a new method for model segmentation, with the goal of applying multiresolution techniques to data sets characterized by curvy areas and the lack of clear demarcation features. The preliminary stage of surface segmentation, which takes as input single …

Numerical Study Of Canopy Flows In Complex Terrain, Xiyan Xu

Dissertations, Theses, and Capstone Projects

Canopy flow plays a substantial role in regulating atmosphere-biosphere exchanges of mass and energy. The worldwide FLUXNET has been developed to quantify the net ecosystem exchange of mass and energy through fluid dynamics in and above vegetation canopy using tower-based eddy covariance (EC) technique. However, EC measurements are subject to advection errors in complex terrain, particularly during nights when atmospheric stability is strong. Because EC measurements are one-dimensional (1D), three-dimensional (3D) air movement, CO2 transport, and temperature variation around the instrumented tower are unknown. We employ a Computational Fluid Dynamics (CFD) model to investigate the impact on CO2 transport of …

On The Merits Of Deploying Tdm-Based Next-Generation Pon Solutions In The Access Arena As Multiservice, All Packet-Based 4g Mobile Backhaul Ran Architecture, Syed Rashid N. Zaidi

Dissertations, Theses, and Capstone Projects

The phenomenal growth of mobile backhaul capacity required to support the emerging fourth-generation (4G) traffic including mobile WiMAX, cellular Long-Term Evolution (LTE), and LTE-Advanced (LTE-A) requires rapid migration from today's legacy circuit switched T1/E1 wireline and microwave backhaul technologies to a new fiber-supported, all-packet-based mobile backhaul infrastructure. Clearly, a cost effective fiber supported all-packet-based mobile backhaul radio access network (RAN) architecture that is compatible with these inherently distributed 4G RAN architectures is needed to efficiently scale current mobile backhaul networks. However, deploying a green fiber-based mobile backhaul infrastructure is a costly proposition mainly due to the significant cost associated with …

Gentle Introduction Resource, James Anderson Laird Evans

Dissertations, Theses, and Capstone Projects

The Gentle Introduciton Resource (GIR) is an open-access web application that offers digital humanities researchers a malleable platform with which they can crowdsource technical material. Such material often poses challenges to the traditional humanities researcher when trying to implement digital layers to his or her research. The Gentle Introduction Resource (GIR) is an open-access web application designed to allow a single classroom or single institution to crowdsource technical information/instruction filtering out the influence of rhetorical analysis. It is written in the Ruby language on the Rails web framework. Though a GIR instance can be invoked to crowdsource primarily web-based information …

School Librarians And The Common Core: How They Can Help Teachers And Students Through The New Standards, Enito Mock

Dissertations, Theses, and Capstone Projects

The author addresses the critical role school libraries play in student academic achievement. He also addresses the role school librarians could play in successfully implementing the Common Core State Standards (CCSS). Historically being left out of education reforms such as No Child Left Behind in 2001, school media specialists now have the opportunity to shine and show off their unique skill set in curriculum design, information literacy, and research. In collaborating with teachers to carry out lesson plans focused on the CCSS, school librarians can teach students essential skills such as critical thinking, brainstorming, and writing/reading techniques. In discussing why …

The Developmental Trajectory Of Contour Integration In Autism Spectrum Disorders, Ted S. Altschuler

Dissertations, Theses, and Capstone Projects

Sensory input is inherently ambiguous and complex, so perception is believed to be achieved by combining incoming sensory information with prior knowledge. One model envisions the grouping of sensory features (the local dimensions of stimuli) to be the outcome of a predictive process relying on prior experience (the global dimension of stimuli) to disambiguate possible configurations those elements could take. Contour integration, the linking of aligned but separate visual elements, is one example of perceptual grouping. Kanizsa-type illusory contour (IC) stimuli have been widely used to explore contour integration processing. Consisting of two conditions which differ only in the alignment …

How Much Value Is Added By Value Added Models? An Analysis Of Teachers’ Performance Over Time Using New York State Assessment Data, Mariana Ristea

Dissertations, Theses, and Capstone Projects

There is a strong movement to evaluate teachers on the basis of students’ performance. To compare teachers fairly, as each may have a mixture of students with different abilities in a given subject area, one should account for variables reflective of students’ subject knowledge and background when entering a course. Most methods of control consist of highly sophisticated statistical models mostly difficult to explain to educators who are being evaluated using such methods. This research presents two value-added methods that could be replicated by using in-house resources and standardized student assessment data which are either continuous or ordinal. One method …

Chemistry Of 6-Monobrominated Indigo, Mbi, Hiroko Ajiki

Dissertations, Theses, and Capstone Projects

6-monobrominated indigo, MBI, is a component of a historically important and the most expensive colorant, Tyrian Purple.

The colorant is remarkably stable under the sun, in the air and after extensive washing with water. The color is still vivid after thousands of years. Even though it has such a high stability, MBI and Tyrian Purple have color changes from purple to blue upon temperature changes. This color change has been known for long to certain people, but the mechanism of the color change was unknown.

Tyrian Purple also has recently attracted interests for applications towards semiconducting material due to its …

Scheduling And Resource Allocation In Wireless Sensor Networks, Yosef Alayev

Dissertations, Theses, and Capstone Projects

In computer science and telecommunications, wireless sensor networks are an active research area. Each sensor in a wireless sensor network has some pre-defined or on demand tasks such as collecting or disseminating data. Network resources, such as broadcast channels, number of sensors, power, battery life, etc., are limited. Hence, a schedule is required to optimally allocate network resources so as to maximize some profit or minimize some cost. This thesis focuses on scheduling problems in the wireless sensor networks environment. In particular, we study three scheduling problems in the wireless sensor networks: broadcast scheduling, sensor scheduling for area monitoring, and …

Nickel-Catalyzed Cross-Coupling Reactions Involving Secondary And Tertiary Alkyl Nucleophiles, Amruta Ajit Joshi

Dissertations, Theses, and Capstone Projects

In the first chapter, introduction of transition metal-catalyzed cross-coupling reactions has been given. These transition metal-catalyzed C-C bond forming reactions have been used extensively in organic synthesis. Among them, C(sp2)-C(sp2) bond forming reactions have been widely studied over decades. More recently, some reports have demonstrated the use of C(sp3) nucleophiles and electrophiles in cross-coupling reactions. However, use of secondary and tertiary alkyl nucleophiles has remained a challenge due to competitive β-hydride elimination and slow transmetallation of bulky secondary and tertiary alkyl organometallic nucleophiles.

In the second chapter, the first general nickel-catalyzed Negishi reaction for the cross-coupling of unactivated, acyclic secondary …

Candida Albicans Als5p Amyloid In Host-Microbe Interactions: A Ceanorhabditis Elegans Study, Michael Bois

Dissertations, Theses, and Capstone Projects

Candida albicans, a dimorphic fungus and an opportunistic pathogen, possesses a myriad of adherence factors including members of the agglutinin-like sequence (Als) family of mannoproteins. The adhesin Als5p mediates adhesion to many substrates, and is upregulated during commensal interactions, but is downregulated during active C. albicans infections[1]. An amyloid forming core sequence at residues 325-331 has been shown to be important for Als5p function, because a single amino acid substitution at position 326 (V326N) greatly reduces Als5p-mediated adherence[2]. We evaluated the role of Als5p in host-microbe interactions, using Caenorhabditis elegans as a host model and feeding them Saccharomyces cerevisiae expressing …