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Articles 151081 - 151110 of 294440

Full-Text Articles in Physical Sciences and Mathematics

Let's Nurture Science, Math Talent, Darren B. Glass May 2016

Let's Nurture Science, Math Talent, Darren B. Glass

Math Faculty Publications

I recently saw the film The Man Who Knew Infinity, which was released in many American cities this weekend, and was struck by the beautiful telling of an inspirational story. The film, which stars Jeremy Irons and Dev Patel, is a biography of the mathematician Srinivasa Ramanujan, who was born in India at the end of the 19th century. [excerpt]

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Finite Involution Semigroups With Infinite Irredundant Bases Of Identities, Edmond W. H. Lee May 2016

Finite Involution Semigroups With Infinite Irredundant Bases Of Identities, Edmond W. H. Lee

Mathematics Faculty Articles

A basis of identities for an algebra is irredundant if each of its proper subsets fails to be a basis for the algebra. The first known examples of finite involution semigroups with infinite irredundant bases are exhibited. These involution semigroups satisfy several counterintuitive properties: their semigroup reducts do not have irredundant bases, they share reducts with some other finitely based involution semigroups, and they are direct products of finitely based involution semigroups.

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Identification Of Protein Palmitoylation Inhibitors From A Scaffold Ranking Library, Laura D. Hamel, Brian J. Lenhart, David A. Mitchell, Radleigh Santos, Marc A. Giulianotti, Robert J. Deschenes May 2016

Identification Of Protein Palmitoylation Inhibitors From A Scaffold Ranking Library, Laura D. Hamel, Brian J. Lenhart, David A. Mitchell, Radleigh Santos, Marc A. Giulianotti, Robert J. Deschenes

Mathematics Faculty Articles

The addition of palmitoyl moieties to proteins regulates their membrane targeting, subcellular localization, and stability. Dysregulation of the enzymes which catalyzed the palmitoyl addition and/or the substrates of these enzymes have been linked to cancer, cardiovascular, and neurological disorders, implying these enzymes and substrates are valid targets for pharmaceutical intervention. However, current chemical modulators of zDHHC PAT enzymes lack specificity and affinity, underscoring the need for screening campaigns to identify new specific, high affinity modulators. This report describes a mixture based screening approach to identify inhibitors of Erf2 activity. Erf2 is the Saccharomyces cerevisiae PAT responsible for catalyzing the palmitoylation …

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Local Standards For Sample Size At Chi, Kelly Caine May 2016

Local Standards For Sample Size At Chi, Kelly Caine

Publications

We describe the primary ways researchers can determine the size of a sample of research participants, present the benefits and drawbacks of each of those methods, and focus on improving one method that could be useful to the CHI community: local standards. To determine local standards for sample size within the CHI community, we conducted an analysis of all manuscripts published at CHI2014. We find that sample size for manuscripts published at CHI ranges from 1 -- 916,000 and the most common sample size is 12. We also find that sample size differs based on factors such as study setting …

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Environmental Factors Influencing Individual Decision-Making Behavior In Software Project: A Systematic Literature Review, Luiz Fernando Capretz, Jingdong Jia May 2016

Environmental Factors Influencing Individual Decision-Making Behavior In Software Project: A Systematic Literature Review, Luiz Fernando Capretz, Jingdong Jia

Electrical and Computer Engineering Publications

As one of the crucial human aspects, individual decision-making behavior that may affect the quality of a software project is adaptive to the environment in which the individual is. However, no comprehensive reference framework of the environmental factors influencing individual decision-making behavior in software projects is presently available. This paper undertakes a systematic literature review (SLR) to gain insight into existing studies on this topic. After a careful SLR process, 40 studies were targeted to solve this question. Based on these extracted studies, we first provided a taxonomy of environmental factors comprising eight categories. Then a total of 237 factors …

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The End-Cretaceous Mass Extinction And The Deccan Traps Eruptions, Rebecca Teed May 2016

The End-Cretaceous Mass Extinction And The Deccan Traps Eruptions, Rebecca Teed

Earth and Environmental Sciences Faculty Publications

This handout focuses on the evidence for the theory that a series of flood-basalt eruptions in northern India caused the mass extinction at the end of the Cretaceous Period. The dinosaurs and about 75% of all marine invertebrate species and many other organisms died abruptly at this time. This is one of a set of four articles on possible causes of the Permian and Cretaceous mass extinctions that can be used to organize classroom debates or to have students compare and contrast the events and their causes.

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Quantifying, Assessing, And Mitigating Methane Emissions From Super-Emitters In The Oil And Gas Supply Chain, David Richard Lyon May 2016

Quantifying, Assessing, And Mitigating Methane Emissions From Super-Emitters In The Oil And Gas Supply Chain, David Richard Lyon

Graduate Theses and Dissertations

Methane emissions from the oil and gas (O&G) supply chain reduce potential climate benefits of natural gas as a replacement for other fossil fuels that emit more carbon dioxide per energy produced. O&G facilities have skewed emission rate distributions with a small fraction of sites contributing the majority of emissions. Knowledge of the identity and cause of these high emission facilities, referred to as super-emitters or fat-tail sources, is critical for reducing supply chain emissions. This dissertation addresses the quantification of super-emitter emissions, assessment of their prevalence and relationship to site characteristics, and mitigation with continuous leak detection systems. Chapter …

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Impact Of Extreme Summer Temperatures On Bridge Structures, Ryan Hagedorn May 2016

Impact Of Extreme Summer Temperatures On Bridge Structures, Ryan Hagedorn

Graduate Theses and Dissertations

Climate change and its effect on weather in the United States is a well-documented phenomenon. In particular, extreme heat waves have become more intense, more frequent, and longer lasting, especially in the southern United States. As with much of America’s transportation infrastructure, prestressed concrete bridge girders experience the effects of these heat waves. Uneven heating of optimized bridge girder sections results in large non-linear temperature gradients. In this study, temperature was monitored in three different AASHTO I-girders to determine the vertical and transverse temperature gradients in a pre-deck placement condition. It was determined that the current design standard, which uses …

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Algal Wastewater Treatment And Biofuel Production: An Assessment Of Measurement Methods, And Impact Of Nutrient Availability And Species Composition, John F. Chamberlin May 2016

Algal Wastewater Treatment And Biofuel Production: An Assessment Of Measurement Methods, And Impact Of Nutrient Availability And Species Composition, John F. Chamberlin

Graduate Theses and Dissertations

In order to move towards a more sustainable future, human civilization will need to decrease its impacts on air and water quality and minimize consumption of fossil fuels. Using algae for wastewater treatment and biofuel production offers one approach to progress towards these goals simultaneously. Algae are capable of removing nutrients from wastewater and carbon dioxide from the air, and the biomass formed in that process can be used to generate a wide-range of products including fertilizer or fuels that could power combustion engines, power plants, or zero-emission fuel cell vehicles. Using wastewater for biofuel production has the potential to …

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Field Observations And Computer Modeling Of Tornado-Terrain Interaction And Its Effects On Tornado Damage And Path, Nawfal Shihab Ahmed May 2016

Field Observations And Computer Modeling Of Tornado-Terrain Interaction And Its Effects On Tornado Damage And Path, Nawfal Shihab Ahmed

Graduate Theses and Dissertations

Tornado forces on structures have been a research focus for the past decades, and some comparisons have been made to distinguish between straight boundary layer (SBL) wind and tornado wind forces on specific structures. However, very little attention has been paid to terrain effects on tornado damage and path. Available damage investigation data for four tornado locations (Joplin-2011, Tuscaloosa-2011, Parish-2011 and Mayflower-2014) is utilized to explore terrain effects on tornado damage and path. Google Earth, site visits and aerial images are employed to study the influence of terrain on an extent of damage and path variation. Additionally, a three dimensional …

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Bayesian Approach To Intelligent Control And Its Relation To Fuzzy Control, Kongliang Zhu, Vladik Kreinovich, Olga Kosheleva May 2016

Bayesian Approach To Intelligent Control And Its Relation To Fuzzy Control, Kongliang Zhu, Vladik Kreinovich, Olga Kosheleva

Departmental Technical Reports (CS)

In many application areas including economics, experts describe their knowledge by using imprecise ("fuzzy") words from natural language. To design an automatic control system, it is therefore necessary to translate this knowledge into precise computer-understandable terms. To perform such a translation, a special semi-heuristic fuzzy methodology was designed. This methodology has been successfully applied to many practical problem, but its semi-heuristic character is a big obstacle to its use: without a theoretical justification, we are never 100% sure that this methodology will be successful in other applications as well. It is therefore desirable to come up with either a theoretical …

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Need For Most Accurate Discrete Approximations Explains Heavy-Tailed Distributions, Songsak Sriboonchitta, Vladik Kreinovich, Olga Kosheleva, Hung T. Nguyen May 2016

Need For Most Accurate Discrete Approximations Explains Heavy-Tailed Distributions, Songsak Sriboonchitta, Vladik Kreinovich, Olga Kosheleva, Hung T. Nguyen

Departmental Technical Reports (CS)

In many practical situations, we encounter Gaussian distributions, for which the distribution tails are light -- in the sense that as the value increases, the corresponding probability density tends to 0 very fast. There are many theoretical explanations for the Gaussian distributions and for similar light-tail distributions. In practice, however, we often encounter heavy-tailed distributions, in which the probability density is asymptotically described, e.g., by a power law. In contrast to the light-tail distributions, there is no convincing theoretical explanation for the heavy-tailed ones. In this paper, we provide such a theoretical explanation. This explanation is based on the fact …

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Two-Player Game Ai, Hunter Noble, Ashraf Aly May 2016

Two-Player Game Ai, Hunter Noble, Ashraf Aly

Celebration of Student Scholarship Poster Sessions Archive

No abstract provided.

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Undergraduate Research Fellowships: A Strategic Investment To Reduce Women Underrepresentation In The Mathematical Sciences, Janie L. Knell, Wilson Gonzalez-Espada May 2016

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.

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Introduction To Paleontology Research Through The Boudreaux Bend Project, Jonathan D. Eisenhour, Abraham S. Mollett, Jennifer M. K. O'Keefe May 2016

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.

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Sign Language Recognition In A Large Scale Sign Database, Pat Jangyodsuk May 2016

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 …

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Comparison Of Machine Learning Algorithms In Suggesting Candidate Edges To Construct A Query On Heterogeneous Graphs, Rohit Ravi Kumar Bhoopalam May 2016

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 …

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Robotics Curriculum For Education In Arlington: Experiential, Simple And Engaging Learning Opportunity For Low-Income K-12 Students, Sharath Vasanthakumar May 2016

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 …

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Ogma - Language Acquisition System Using Immersive Virtual Reality, Sanika Gupta May 2016

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 …

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Performance Evaluation Of Matrix Operations On Map-Reduce Query Language, Ahmed Abdul Hameed A Ulde May 2016

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 …

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Spatio-Temporal Patterns Of Gps Trajectories Using Association Rule Mining, Vivek Kumar Sharma May 2016

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 …

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Processing Queries Over Partitioned Graph Databases: An Approach And It's Evaluation, Jay Dilipbhai D. Bodra May 2016

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 …

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Localization And Control Of Distributed Mobile Robots With The Microsoft Kinect And Starl, Nathan Hervey May 2016

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 …

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Adwire: Add-On For Web Item Review System, Rajeshkumar Ganesh Kannapalli May 2016

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, …

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A Data Driven, Hospital Quality Of Care Portal For The Patient Community, Sreehari Balakrishna Hegden May 2016

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. …

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A New Real-Time Approach For Website Phishing Detection Based On Visual Similarity, Omid Asudeh May 2016

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 …

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Representations Of The Extended Poincare Superalgebras In Four Dimensions, John David Griffis May 2016

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 …

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A Bisection Method For The Banded Hyperbolic Quadratic Eigenvalue Problem, Ahmed T. Ali May 2016

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 …

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Stochastic Reliability Models For A General Server And Related Networks, Rachel Traylor May 2016

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 …

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Optical Analysis And Fabrication Of Micro And Nanoscale Plasmonically Enhanced Devices, Avery M. Hill May 2016

Optical Analysis And Fabrication Of Micro And Nanoscale Plasmonically Enhanced Devices, Avery M. Hill

Mechanical Engineering Undergraduate Honors Theses

Plasmonic nanostructures have been shown to act as optical antennas that enhance optical devices due to their ability to focus light below the diffraction limit of light and enhance the intensity of the incident light. This study focuses on computational electromagnetic (CEM) analysis of two devices: 1) GaAs photodetectors with Au interdigital electrodes and 2) Au thin-film microstructures. Experiments showed that the photoresponse of the interdigital photodetectors depend greatly on the electrode gap and the polarization of the incident light. Smaller electrode gap and transverse polarization give rise to a larger photoresponse. It was also shown that the response from …

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