Physical Sciences and Mathematics Commons^™

Undergraduate Research Fellowships: A Strategic Investment To Reduce Women Underrepresentation In The Mathematical Sciences, Janie L. Knell, Wilson Gonzalez-Espada

Celebration of Student Scholarship Poster Sessions Archive

No abstract provided.

Introduction To Paleontology Research Through The Boudreaux Bend Project, Jonathan D. Eisenhour, Abraham S. Mollett, Jennifer M. K. O'Keefe

Celebration of Student Scholarship Poster Sessions Archive

No abstract provided.

Star Formation In Ring Galaxies, Susan C. Olmsted

Undergraduate Honors Theses

Ring galaxies are specific types of interacting galaxies in which a smaller galaxy has passed through the center of the disk of another larger galaxy. The intrusion of the smaller galaxy causes the structure of the larger galaxy to compress as the smaller galaxy falls through, and to recoil back after the smaller galaxy passes through, hence the ring-like shape. In our research, we studied the star-forming regions of a sample of ring galaxies and compared to those of other interacting galaxies and normal galaxies. Using UV, optical, and IR archived images in twelve wavelengths from three telescopes, we analyzed …

Sign Language Recognition In A Large Scale Sign Database, Pat Jangyodsuk

Computer Science and Engineering Dissertations - Archive

Recognizing a sign in a sign language video is one of the well known challenging problems in computer vision community. The difficulty arises from many factors including inconsistent sign performing, noisy background, difference in image transformation between training and testing set such as scale, rotation and illumination. One of the most difficult problems, however, is capturing core information features. In most cases, hands are considered the dominant features since sign language usually involve hands movement and shapes. Having a large scale of a sign database also create another issue, expensive look-up time. As with majority of machine learning application, sign …

Comparison Of Machine Learning Algorithms In Suggesting Candidate Edges To Construct A Query On Heterogeneous Graphs, Rohit Ravi Kumar Bhoopalam

Computer Science and Engineering Theses - Archive

Querying graph data can be difficult as it requires the user to have knowledge of the underlying schema and the query language. Visual query builders allow users to formulate the intended query by drawing nodes and edges of the query graph, which can be translated into a database query. Visual query builders help users formulate the query without requiring the user to have knowledge of the query language and the underlying schema. To the best of our knowledge, none of the currently available visual query builders suggest users what nodes/edges to include into their query graph. We provide suggestions to …

Robotics Curriculum For Education In Arlington: Experiential, Simple And Engaging Learning Opportunity For Low-Income K-12 Students, Sharath Vasanthakumar

Computer Science and Engineering Theses - Archive

Engineering disciplines (such as biomedical, civil, computer science, electrical, mechanical) are instrumental to society’s wellbeing and technological competitiveness; however the interest of K-12 American students in these and other engineering fields is fading. To broaden the base of engineers for the future, it is critical to excite young minds about STEM. Research that is easily visible to K-12 students, including underserved and minority population with limited access to technology, is crucial in igniting their interests in STEM fields. More specifically, research topics that involve interactive elements such as Robots may be instrumental for K-12 education in and outside classroom. Robots …

Ogma - Language Acquisition System Using Immersive Virtual Reality, Sanika Gupta

Computer Science and Engineering Theses - Archive

One of the methods of learning a new language, or Second-Language Acquisition (SLA), is immersion, seen today as one of the most effective learning methods. Using this method, the learner relocates to a new place where the target language is the dominant language and tries to learn the language my immersing themselves in the local environment. However, it isn’t a feasible option for all, thus, traditional, less effective learning methods are used. As an alternative solution, we use virtual reality (VR) as a new method to learn a new language. VR is an immersive technology that allows the user to …

Performance Evaluation Of Matrix Operations On Map-Reduce Query Language, Ahmed Abdul Hameed A Ulde

Computer Science and Engineering Theses - Archive

Non-Negative matrix factorization is well-known complex machine learning algorithm which is also used in collaborative filtering. Collaborative filtering technique is used in recommendation systems and these techniques aim at predicting the missing values in user-item association matrix. User-item association matrix contains number of users as rows and number of movies as columns and the values are the ratings given by user to respective movies. These matrices have large dimensions, missing values and needs parallel processing. Map reduce query language (MRQL) is a query processing and optimization system for large-scale, distributed data analysis, built on top of Apache hadoop, spark, hama …

Spatio-Temporal Patterns Of Gps Trajectories Using Association Rule Mining, Vivek Kumar Sharma

Computer Science and Engineering Theses - Archive

The availability of location-tracking devices such as GPS, Cellular Networks and other devices provides the facility to log a person or device locations automatically. This creates spatio-temporal datasets of user's movement with features like latitude,longitude of a particular location on a specific day and time. With the help of these features different patterns of user movement can be collected,queues and analyzed.In this research work, we are focused on user's movement patterns and frequent movements of users on a particular place,day or time interval. To achieve this we used Association Rule mining concept based on Apriori algorithm to find interesting movement …

Processing Queries Over Partitioned Graph Databases: An Approach And It's Evaluation, Jay Dilipbhai D. Bodra

Computer Science and Engineering Theses - Archive

Representation of structured data using graphs is meaningful for applications such as road and social networks. With the increase in the size of graph databases, querying them to retrieve desired information poses challenges in terms of query representation and scalability. Independently, querying and graph partitioning have been researched in the literature. However, to the best of our knowledge, there is no effective scalable approach for querying graph databases using partitioning schemes. Also, it will be useful to analyze the quality of partitioning schemes from the query processing perspective. In this thesis, we propose a divide and conquer approach to process …

Localization And Control Of Distributed Mobile Robots With The Microsoft Kinect And Starl, Nathan Hervey

Computer Science and Engineering Theses - Archive

With the increasing availability of mobile robotic platforms, interest in swarm robotics has been growing rapidly. The coordinated effort of many robots has the potential to perform a myriad of useful and possibly dangerous tasks, including search and rescue missions, mapping of hostile environments, and military operations. However, more research is needed before these types of capabilities can be fully realized. In a laboratory setting, a localization system is typically required to track robots, but most available systems are expensive and require tedious calibration. Additionally, dynamical models of the robots are needed to develop suitable control methods, and software must …

Adwire: Add-On For Web Item Review System, Rajeshkumar Ganesh Kannapalli

Computer Science and Engineering Theses - Archive

Past few decades have seen a widespread use and popularity of online review sites such as Yelp, TripAdvisor, etc. As many users depend upon reviews before deciding upon a product, businesses of all types are motivated to possess an expansive arsenal of user feedback (preferably positive) in order to mark their reputation and presence in the Web (e.g., Amazon customer reviews). In spite of the fact that a huge extent of buying choices today are driven by numeric scores (e.g., movie rating in IMDB), detailed reviews play an important role for activities like purchasing an expensive mobile phone, DSLR camera, …

A Data Driven, Hospital Quality Of Care Portal For The Patient Community, Sreehari Balakrishna Hegden

Computer Science and Engineering Theses - Archive

With the recent changes in health services provision, patients are members of a consumer driven health care system. However, the health care consumers are not presented with adequate opportunities to enhance their position in choosing high quality hospital services. As a result, the demand for active patient participation in the choice of quality and safe hospital services remained unaddressed. In this research work, we developed MediQoC (Medicare Quality of Care), a data driven web portal for Medicare patients, their caregivers and the health care insurance policy designers to grant access to data-driven information about hospitals, and quality of care indicators. …

A New Real-Time Approach For Website Phishing Detection Based On Visual Similarity, Omid Asudeh

Computer Science and Engineering Theses - Archive

Phishing attacks cause billions of dollars of loss every year worldwide. Among several solutions proposed for this type of attack, visual similarity detection methods have a good amount of accuracy. These methods exploit the fact that malicious pages mostly imitate some visual signals in the targeted websites. Visual similarity detection methods usually look for the imitations between the screen-shots of the web-pages and the image database of the most targeted websites. Despite their accuracy, the existing visual based approaches are not practical for the real-time purposes because of their image processing overhead. In this work, we use a pipeline framework …

Microdialysis Studies Using Porcine Pancreatic Elastase To Guide Mathematical Modeling Of Microdialysis Sampling For In Vivo Measurements., Mason W. Young

Biomedical Engineering Undergraduate Honors Theses

Microdialysis sampling uses a semi-permeable membrane to allow solute collection by diffusion. When used in conjunction with other instruments, analytes in question can be quantified. Matrix Metalloproteinases (MMPs) are enzymes involved in numerous biological processes where they serve the role of degrading extracellular matrix. Microdialysis sampling, in coordination with further analysis methods, can be used in order to measure the activity of these enzymes in a region of the body instantaneously. The intention of this project is to determine ways of measuring in vitro activity of elastase from porcine pancreas using determined activity values and the collection of elastase products. …

Representations Of The Extended Poincare Superalgebras In Four Dimensions, John David Griffis

Mathematics Dissertations - Archive

Eugene Wigner used the Poincare group to induce representations from the fundamental internal space-time symmetries of (special) relativistic quantum particles. Wigner’s students spent considerable amount of time translating passages of this paper into more detailed and accessible papers and books. In 1975, R. Haag et al. investigated the possible extensions of the symmetries of relativistic quantum particles. They showed that the only consistent (super)symmetric extensions to the standard model of physics are obtained by using super charges to generate the odd part of a Lie superalgebra whos even part is generated by the Poincare group; this theory has become known …

A Bisection Method For The Banded Hyperbolic Quadratic Eigenvalue Problem, Ahmed T. Ali

Mathematics Dissertations - Archive

It is well-known that the eigenvalues of a Hermitian matrix in a given interval can be approximated within a predefined error tolerance using the bisection method as a direct application of the Sylvester's Law of Inertia. In this thesis, we will develop a bisection method for the hyperbolic quadratic eigenvalue problem (HQEP) which is guaranteed to have 2n real eigenvalues for a problem of size n. A number of numerical methods are available to solve HQEPs. Matlab's polyeig uses the QZ algorithm on the problem after linearizing it to a pencil of size 2n. Another approach is by finding a …

Stochastic Reliability Models For A General Server And Related Networks, Rachel Traylor

Mathematics Dissertations - Archive

There are many types of systems which can be dubbed servers, i.e. a retail checkout counter, a shipping company, a web server, or a customer service hotline. All of these systems have common general behavior: requests or customers arrive via a stochastic process, the service times vary randomly, and each request increases the stress on the server for some interval of time. A general stochastic model that describes the reliability of a server can provide the necessary informationfor optimal resource allocation and efficient task scheduling, leading to significant cost savings and improved performance metrics. In this work, we consider several …

Towards Secure Online Distribution Of Multimedia Codestreams, Swee Won Lo

Dissertations and Theses Collection (Open Access)

Multimedia codestreams distributed through open and insecure networks are subjected to attacks such as malicious content tampering and unauthorized accesses. This dissertation first addresses the issue of authentication as a mean to integrity - protect multimedia codestreams against malicious tampering. Two cryptographic-based authentication schemes are proposed to authenticate generic scalable video codestreams with a multi-layered structure. The first scheme combines the salient features of hash-chaining and double error correction coding to achieve loss resiliency with low communication overhead and proxy-transparency. The second scheme further improves computation cost by replacing digital signature with a hash-based message authentication code to achieve packet-level …

Energy Transfer And Localization In Molecular Crystals, Mitchell A. Wood

Open Access Dissertations

With the aim of developing new technologies for the detection and defeat of energetic materials, this collection of work was focused on using simulations to characterize materials at extremes of temperature, pressure and radiation. Each branch of the work here is collected by which material response is potentially used as the detectable signal.

Where the chemical response is of interest, this work will explore the possibility of non-statistical chemical reactions in condensed-phase energetic materials via reactive molecular dynamics (MD) simulations. We characterize the response of three unique high energy density molecular crystals to different means of energy input: electric fields …

Relationships Between Nutrients, Periphyton Abundance, And Benthic Macroinvertebrate Scrapers In Ozark Highland Streams, Harrison Smith

Biological Sciences Undergraduate Honors Theses

We collected samples from seven Arkansas streams during the months of August 2014 and February 2015 with the objective of determining possible relationships between nutrients, periphyton abundance and benthic macroinvertebrates. We hypothesized that periphyton would be positively associated with nutrients, and that increases in periphyton biomass would increase the abundance and diversity of benthic scraper families. Samples were collected from three transects at each site. The periphyton was analyzed for carbon, nitrogen, phosphorus, and ash free dry mass and Chl-a content. Macroinvertebrates families belonging to the feeding group of grazers/scrapers were compared with water column and periphyton nutrient concentrations, as …

Barays, Boeungs And Bassins: Reservoirs And The Capacity For Life And Change In Cambodia, Kevin D. Curry

Bridgewater Review

No abstract provided.

Fault Localization Based On Combinatorial Testing, Laleh Shikh Gholamhosseinghandehari

Computer Science and Engineering Dissertations - Archive

Combinatorial testing is a software testing strategy that has received a significant amount of attention from academia and industry. After executing a combinatorial test set, the execution status, i.e., pass or fail, of each test is obtained. If there is one or more failed tests, the next task is fault localization, i.e. localizing the fault in the source code. This dissertation addresses the problem of how to perform fault localization by leveraging the result of combinatorial testing. The major contribution of this dissertation is a fault localization approach called BEN that consists of two major phases: 1) failure-inducing combination identification, …

Towards Better Usability Of Query Systems For Massive Ultra-Heterogeneous Graphs: Novel Approaches Of Query Formulation And Query Specification, Nandish Jayaram

Computer Science and Engineering Dissertations - Archive

There is a pressing need to tackle the usability challenges in querying massive, ultraheterogeneous entity graphs which use thousands of node and edge types in recording millions to billions of entities (persons, products, organizations) and their relationships. Widely known instances of such graphs include Freebase, DBpedia and YAGO. Applications in a variety of domains are tapping into such graphs for richer semantics and better intelligence. Both data workers and application developers are often overwhelmed by the daunting task of understanding and querying these data, due to their sheer size and complexity. To retrieve data from graph databases, the norm is …

Synthesis And Characterization Of Nanocomposite Scintillators For Radiation Detection, Sunil Kumar Sahi

Physics Dissertations - Archive

Inorganic single crystal and organic (plastic and liquid) scintillators are commonly used for radiation detection. Inorganic single crystals are efficient and have better energy resolution compared to organic scintillators. However, inorganic single crystals are difficult to grow in large size and hence expensive. On the other hand, fast decay time and ease of fabrication makes organic scintillators attractive for many applications. However, poor energy resolution of organic scintillators limits its applications in gamma ray spectroscopy. The poor energy resolution is due to the low Z-Value and low density of organic scintillator. The Z-value of organic plastic scintillator can be increase …

Rhenium(I) Complexes Of Tetraazatetrapyridopentacene (Tatpp): Synthesis, Characterization, Reactivity, Anticancer Potential And Luminescent Probe To Determine Cellular Localization, Pooja Ahuja

Chemistry & Biochemistry Dissertations - Archive

The ruthenium polypyridyl complexes [(phen)2Ru(tatpp)Ru(phen)2]4+ ([P]4+) and [(phen)2Ru(tatpp)]2+ ([MP]2+) are promising anti-tumor agents that arrest H358 NSCLC tumor growth in mouse tumor models and show cytotoxicity in the low micromolar range towards a number of platinum sensitive NSCLC lines (H358, H226, HOP62, H2087). Dose escalation toxicity studies in mice reveal that [MP]2+ and [P]4+ are tolerated without any short term side effects at levels up to 40 mg drug/kg mouse and >160 mg drug/kg mouse respectively with no obvious side effects, when administered as IP injection. Mechanistic studies reveal that much of the anti-tumor activity is primarily due to the …

Application Of Novel Heterosubstituted Vinylimidazoles: An Approach En Route To The Total Synthesis Of Axinellamine A, Abhisek Ray

Chemistry & Biochemistry Dissertations - Archive

Our group is primarily interested in the total synthesis of oroidin-based pyrrole-imidazole-containing marine sponge-derived alkaloids. These pyrrole-imidazole natural products are a growing class of alkaloids with exotic connectivity, unique topologies, and high nitrogen content. Presence of 2-aminoimidazole and pyrrolecarboxamide fragments in the structure represent their signature features. Due to their structural diversity and biological activity, many groups are interested in the total synthesis of these natural products. It has been proposed that many of the alkaloids in this family are produced in nature by dimerization of the simplest member, oroidin. In this dissertation we have explored a biosynthetic hypothesis disclosed …

The Characterization Of Friable Surface Deposits Across North Africa Utilizing Computer Controlled Scanning Electron Microscopy (Ccsem), Zachary Edward Sutton

Earth & Environmental Sciences Theses - Archive

Analysis of the mineral constituents of friable surface deposits from the Burkina Faso and Niger regions, North Africa, was undertaken by computer controlled scanning electron microscopy (CCSEM) to try and identify variations in mineralogical composition which could be used for source attribution to distinguish windblown material from different contributing source areas. A total of 16 friable surface samples were collected for CCSEM analysis. These samples were from multiple geographic locations within the Burkina Faso region. CCSEM analysis generated data on individual dust particles that included: particle size, shape, and chemical composition. This combination of the Scanning Electron Microscope (SEM) working …

On The Quantum Spaces Of Some Quadratic Regular Algebras Of Global Dimension Four, Richard Gene Chandler

Mathematics Dissertations - Archive

A quantum $\mathbb{P}^3$ is a noncommutative analogue of a polynomial ring on four variables, and, herein, it is taken to be a regular algebra of global dimension four. It is well known that if a generic quadratic quantum $\mathbb{P}^3$ exists, then it has a point scheme consisting of exactly twenty distinct points and a one-dimensional line scheme. In this thesis, we compute the line scheme of a family of algebras whose generic member is a candidate for a generic quadratic quantum $\mathbb{P}^3$. We find that, as a closed subscheme of $\mathbb{P}^5$, the line scheme of the generic member is the …

Developing A Risk Analysis Model To Improve Study Abroad Awareness, Tyler Spain

Industrial Engineering Undergraduate Honors Theses

As international education opportunities increase in popularity among U.S. college students (McMurtrie, 2007), it is becoming more and more necessary for study abroad organizations to be aware of the risks students face as they travel abroad. While some international cities are riskier than others, it can be difficult to distinguish between cities which truly carry a high degree of risk for visiting students, and which cities are only perceived to be risky based on various personal misconceptions. The University of Arkansas Office of Study Abroad & International Exchange currently lacks a way to quantifiably analyze the risk of study abroad …