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Articles 241 - 270 of 823
Full-Text Articles in Computer Sciences
Removing Points From A Delaunay Tetrahedralization, Nathan Moon, Dr. Bryan S. Morse
Removing Points From A Delaunay Tetrahedralization, Nathan Moon, Dr. Bryan S. Morse
Journal of Undergraduate Research
A set of points in three dimensions can be tetrahedralized, or broken into non-intersecting tetrahedra, in many ways. A Delaunay tetrahedralization of a set of points is a tetrahedralization with the property that the sphere defined by each tetrahedron in the structure does not contain any other points in the structure besides the points defining the tetrahedron. A Delaunay tetrahedralization of a set of points is unique except for the case where more than four points are co-spherical.
The Market For High-Tech Skills And The Business Student, Milen E. Marinov, Dr. J. Owen Cherrington
The Market For High-Tech Skills And The Business Student, Milen E. Marinov, Dr. J. Owen Cherrington
Journal of Undergraduate Research
Being granted the ORCA scholarship I started researching information technology (IT) skills that will make a business student more marketable. I began my research at the end of November 1999. Gradually, along with demanded IT skills my research activity included the gathering and systematizing of information pertaining to the nature, existence, operation, and goals of centers for electronic business. The gatherings and conclusions I have made will be reflected in the mission and day-to-day activities of the Kevin and Debra Rollins Center for eBusiness @BYU. The eBusiness Center was established April 12, 2000. It is a product of extensive research …
The Market For High-Tech Skills And The Business Student, Milen E. Marinov, Dr. J. Owen Cherrington
The Market For High-Tech Skills And The Business Student, Milen E. Marinov, Dr. J. Owen Cherrington
Journal of Undergraduate Research
Being granted the ORCA scholarship I started researching information technology (IT) skills that will make a business student more marketable. I began my research at the end of November 1999. Gradually, along with demanded IT skills my research activity included the gathering and systematizing of information pertaining to the nature, existence, operation, and goals of centers for electronic business. The gatherings and conclusions I have made will be reflected in the mission and day-to-day activities of the Kevin and Debra Rollins Center for eBusiness @BYU. The eBusiness Center was established April 12, 2000. It is a product of extensive research …
Software Development In Monterrey, Mexico, J. Edgar Gómez, Dr. Robert Jackson
Software Development In Monterrey, Mexico, J. Edgar Gómez, Dr. Robert Jackson
Journal of Undergraduate Research
As Mexican companies enter the global market they discover how important it is to integrate advances in technology into their everyday business transactions. Software development is one of the areas of technological advances where great effort has been made. According to the Wall Street Journal (1), changes in technological development in Mexico are due in large part to the North American Free Trade Agreement (NAFTA) with the United States and Canada, that has attracted large amounts of foreign direct investment (FDI).
Automatic Sensor And Action Selection, Charles Parkinson Fry, Todd Peterson
Automatic Sensor And Action Selection, Charles Parkinson Fry, Todd Peterson
Journal of Undergraduate Research
Continuous state spaces can be quite useful in Q-learning. Many real world problems are simply not discrete. An attempt to represent continuous values using a discrete state space is inherently problematic, as the selected level of discritization will likely be imperfect and unable to adapt to change. Such problems thus favor a continuous representation of the state space. Continuous state spaces, however, introduce new difficulties. They are infinitely large, and Q-learning is no longer guaranteed to converge.
Establishing A Foundation For The Testing And Evaluation Of Effective Scenario Elicitation Tools, Benjamin Dunford, Dr. Douglas Dean
Establishing A Foundation For The Testing And Evaluation Of Effective Scenario Elicitation Tools, Benjamin Dunford, Dr. Douglas Dean
Journal of Undergraduate Research
In system development, no other phase is as fraught with difficulties as determining what exactly the system “should do” for a proposed project. These difficulties arise through a divergence in how the end user envisions the system should operate and how the analyst or developer perceives the user would like the system to operate. The search for a common language that both analyst and end user could use to effectively communicate what a system “should do”, or the system requirements, gave rise to the use of scenarios. Scenarios are textual narratives of how the system should operate in a given …
Stock Price Reactions To Announcements Of U.S. Gaap/Ifrs Convergence, Lorien Stice, Dr. Ted Christensen
Stock Price Reactions To Announcements Of U.S. Gaap/Ifrs Convergence, Lorien Stice, Dr. Ted Christensen
Journal of Undergraduate Research
This research investigates investors’ perceptions of the expected impact of adopting international accounting standards on U.S. companies. Since these rules differ from current U.S. standards, some speculate that the costs to convert companies’ reporting systems to conform to international standards will have significantly negative effects on their profitability. My project explores stock price reactions to SEC announcements which indicate an increased or decreased probability that U.S. firms will soon be required to switch to International Financial Reporting Standards (IFRS). I hypothesize that expected conversion costs will be higher for companies that are not already operating in foreign countries because more …
A Speculative Approach To Parallelization In Particle Swarm Optimization, Matthew Gardner, Dr. Kevin Seppi
A Speculative Approach To Parallelization In Particle Swarm Optimization, Matthew Gardner, Dr. Kevin Seppi
Journal of Undergraduate Research
Optimization problems are ubiquitous in our modern world. Businesses such as Google need to decide where to place ads, scientists need to t models to data, and airlines need to schedule their flights. All of these problems are optimization problems, and optimization techniques can be used to find solutions. Particle swarm optimization (PSO) is a relatively new optimization technique that draws on ideas from the sociology of flocking birds. It was originally developed for use on a single machine, and attempts at modifying the algorithm to run in parallel are still quite preliminary. However, the problems people want to solve …
Structure Preserving Model Reduction In Lti Networks With Applications To Robust Network Reconstruction, Enoch Yeung, Dr. Sean Warnick
Structure Preserving Model Reduction In Lti Networks With Applications To Robust Network Reconstruction, Enoch Yeung, Dr. Sean Warnick
Journal of Undergraduate Research
The purpose of this project was to investigate systematic methods for finding simplified representations that accurately model the structure and input-output dynamics of high dimensional nonlinear time-invariant systems near equilibrium points. As background, the dynamics of nonlinear time-invariant systems near their equilibrium points can be approximated using linearized state-space systems. As long as the trajectory of the nonlinear system remains close enough to the equilibrium, a linearized system can be a convenient way of analyzing the input-output dynamics and structure of the nonlinear system.
A Technique For Mitigating The Curse Of Dimensionality In Sequential Decision Making Problems, Anurag Rai, Dr. Sean Warnick
A Technique For Mitigating The Curse Of Dimensionality In Sequential Decision Making Problems, Anurag Rai, Dr. Sean Warnick
Journal of Undergraduate Research
There are many instances in our world today where a distinct decision must be made at each stage of a process. Any decision made has both immediate and long term impacts. Hence, when making these decisions any low present cost must be balanced with the possibly high future costs. Choosing the best set of decisions, which minimizes the total cost, is the essence of sequential decision making problems.
A Probabilistic Pair-Hidden Markov Model For Snp Detection In Next Generation Sequencing Data, Nathan Clement, Dr. Quinn Snell
A Probabilistic Pair-Hidden Markov Model For Snp Detection In Next Generation Sequencing Data, Nathan Clement, Dr. Quinn Snell
Journal of Undergraduate Research
In order to create and maintain a healthy human body, over three billion nucleotides (molecules of DNA, collectively called a genome) need to work together in harmony. Each cell in the human body needs its own copy of the genome, so during growth an individual’s DNA is replicated many times. Because the process of replication is not perfect, there are occasional mistakes. Sometimes, these mistakes can be fixed by the body’s own repair mechanisms, but occasionally, a single change in one of the three billion molecules in a human genome have lifethreatening results (for example, see the entry on Cystic …
A Weak Structural Approach To Decentralized Control, David Ward, Dr. Sean Warnick
A Weak Structural Approach To Decentralized Control, David Ward, Dr. Sean Warnick
Journal of Undergraduate Research
The research discussed here explores the interplay between dynamical structure functions, the communication structure of a controller and the zero pattern of a controller. Precisely understanding this interplay is a necessary result to utilize dynamical structure functions to help broaden the known tractable class of decentralized control problems. The long term goal of this research is to broaden the set of tractable convex decentralized control problems by utilizing the structure encapsulated in dynamical structure functions. The research highlighted here was presented during the 2010 BYU Spring research conference and published in detail as my undergraduate honors thesis “Decentralized Control Problems: …
Visualization Of Higher-Dimensional Objective Functions: Avoiding Local Extrema And Non-Concave Sections, Jason Cook, Dr. Robert Burton
Visualization Of Higher-Dimensional Objective Functions: Avoiding Local Extrema And Non-Concave Sections, Jason Cook, Dr. Robert Burton
Journal of Undergraduate Research
Economic models are built from economic theory for applications ranging from evaluating past policies to predicting future market behavior. Estimation of these models often requires the use of nonlinear optimization routines. As a result, the objective function being optimized is often characterized by local extrema, saddles, and relatively flat areas which make it difficult for search algorithms to converge at global extrema. Currently, only crude and subjective solutions are utilized in applied research, resembling simple guess and check strategies.
Practical Cost-Conscious Active Learning For Data Annotation In Annotator-Initiated Environments, Robbie A. Haertel
Practical Cost-Conscious Active Learning For Data Annotation In Annotator-Initiated Environments, Robbie A. Haertel
Theses and Dissertations
Many projects exist whose purpose is to augment raw data with annotations that increase the usefulness of the data. The number of these projects is rapidly growing and in the age of “big data” the amount of data to be annotated is likewise growing within each project. One common use of such data is in supervised machine learning, which requires labeled data to train a predictive model. Annotation is often a very expensive proposition, particularly for structured data. The purpose of this dissertation is to explore methods of reducing the cost of creating such data sets, including annotated text corpora.We …
Interactive Techniques Between Collaborative Handheld Devices And Wall Displays, Daniel Leon Schulte
Interactive Techniques Between Collaborative Handheld Devices And Wall Displays, Daniel Leon Schulte
Theses and Dissertations
Handheld device users want to work collaboratively on large wall-sized displays with other handheld device users. However, no software frameworks exist to support this type of collaborative activity. This thesis introduces a collaborative application framework that allows users to collaborate with each other across handheld devices and large wall displays. The framework is comprised of a data storage system and a set of generic interactive techniques that can be utilized by applications. The data synchronization system allows data to be synchronized across multiple handheld devices and wall displays. The interactive techniques enable users to create data items and to form …
User Experience Engineering Adoption And Practice: A Longitudinal Case Study, Brady Edwin Redfearn
User Experience Engineering Adoption And Practice: A Longitudinal Case Study, Brady Edwin Redfearn
Theses and Dissertations
User Experience Engineering (UxE) incorporates subject areas like usability, HCI, interaction experience, interaction design, "human factors", ergonomics", cognitive psychology", behavioral psychology and psychometrics", systems engineering", [and] "computer science," (Hartson, 1998). It has been suggested that UxE will be the main success factor in organizations as we enter the "loyalty decade" of software development, where the repeat usage of a product by a single customer will be the metric of product success (Alghamdi, 2010; Law & van Schaik, 2010, p. 313; Nielsen, 2008; Van Schaik & Ling, 2011). What is relatively unknown in the current academic literature is whether existing UxE …
Dynamic Near Field Communication Pairing For Wireless Sensor Networks, Steven Charles Cook
Dynamic Near Field Communication Pairing For Wireless Sensor Networks, Steven Charles Cook
Theses and Dissertations
Wireless sensor network (WSN) nodes communicate securely using pre-installed cryptographic keys. Although key pre-installation makes nodes less expensive, the technical process of installing keys prevents average users from deploying and controlling their own WSNs. Wireless pairing enables users to set up WSNs without pre-installing keys, but current pairing techniques introduce numerous concerns regarding security, hardware expense, and usability. This thesis introduces dynamic Near Field Communication (NFC) pairing, a new pairing technique designed for WSNs. This pairing overcomes the limitations of both key pre-installation and current pairing techniques. Dynamic NFC pairing is as secure as using pre-installed keys, requires only inexpensive …
Inverted Sequence Identification In Diploid Genomic Scaffold Assembly Via Weighted Max-Cut Reduction, Paul Mark Bodily
Inverted Sequence Identification In Diploid Genomic Scaffold Assembly Via Weighted Max-Cut Reduction, Paul Mark Bodily
Theses and Dissertations
Virtually all genome assemblers to date are designed for use with data from haploid or homozygous diploid genomes. Their use on heterozygous genomic datasets generally results in highly-fragmented, error-prone assemblies, owing to the violation of assumptions during both the contigging and scaffolding phases. Of the two phases, scaffolding is more particularly impacted and algorithms to facilitate the scaffolding of heterozygous data are lacking. We present a stand-alone scaffolding algorithm, ScaffoldScaffolder, designed specifically for scaffolding diploid genomes. A fundamental step in the scaffolding phase is the assignment of sequence orientations to contigs within scaffolds. Deciding such an assignment in the presence …
Interactive Depth-Aware Effects For Stereo Image Editing, Joshua E. Abbott
Interactive Depth-Aware Effects For Stereo Image Editing, Joshua E. Abbott
Theses and Dissertations
This thesis introduces methods for adding user-guided depth-aware effects to images captured with a consumer-grade stereo camera with minimal user interaction. In particular, we present methods for highlighted depth-of-field, haze, depth-of-field, and image relighting. Unlike many prior methods for adding such effects, we do not assume prior scene models or require extensive user guidance to create such models, nor do we assume multiple input images. We also do not require specialized camera rigs or other equipment such as light-field camera arrays, active lighting, etc. Instead, we use only an easily portable and affordable consumer-grade stereo camera. The depth is calculated …
Patchmatch-Based Content Completion Of 3d Images, Joel Arthur Howard
Patchmatch-Based Content Completion Of 3d Images, Joel Arthur Howard
Theses and Dissertations
This thesis presents a method for completing target regions ("hole filling") in RGB stereo pairs. It builds upon the state of the art for completing single images by matching to and then blending source patches drawn from the rest of the image. A method is introduced for first completing the respective disparity maps using a coupled partial differential equation based on that of Bertalmio, et al. extended to create mutual disparity consistency. Estimated disparities are then used to guide completion of the missing color image texture. An extension to the coherence-based objective function introduced by Wexler, et al. is then …
Computational Techniques For Public Health Surveillance, Scott H. Burton
Computational Techniques For Public Health Surveillance, Scott H. Burton
Theses and Dissertations
Public health surveillance is a critical part of understanding, and ultimately influencing, health behaviors. Traditional methods, such as questionnaires and focus groups have significant limitations including cost, delay, and size. Online social media data has the potential to overcome many of the challenges of traditional methods, but its exploitation is not trivial. We develop and apply computational techniques to enable public health surveillance in novel ways and on a larger scale than currently performed.In this regard, we present techniques for mining the who, what, and where of public health surveillance in social media. We show how computational methods can identify …
Dynamics Of Self-Enforcing Cooperation In Competitive Environments, Nathan Woodbury, Dr. Sean Warnick
Dynamics Of Self-Enforcing Cooperation In Competitive Environments, Nathan Woodbury, Dr. Sean Warnick
Journal of Undergraduate Research
My original purpose in this project was to “explore the nature of self-enforcing policies that induce participation in coalitions within a competitive environment.” In order to do this, I proposed to use a model of a general market of many suppliers. This model was to be an extension of previous models created by Dr. Sean Warnick, Nghia Tran, and Tanja Brown ([1] and [2]).
An Algorithmic Approach For Real-¬‐Time Music Improvisation, Denna Lawrence, Dr. Sean Warnick
An Algorithmic Approach For Real-¬‐Time Music Improvisation, Denna Lawrence, Dr. Sean Warnick
Journal of Undergraduate Research
I developed an algorithm that generated musical accompaniment to real-time improvisation from a soloist and analyzed my results using well-defined conditions of harmonization.
Probabilistic Inference And Ranking Of Gene Regulatory Pathways As A Shortest-Path Problem, James Jensen, Dr. Mark Clement
Probabilistic Inference And Ranking Of Gene Regulatory Pathways As A Shortest-Path Problem, James Jensen, Dr. Mark Clement
Journal of Undergraduate Research
The project began in the Computational Science Lab in the Computer Science Department, where I was given the assignment of finding something useful to do with a collaborating biologist’s microarray data. Initially, the goal was to identify differentially expressed genes, and shifted to integrating differential expression analysis with other tools. It was at this stage of the project that I submitted the grant application. However, integrating multiple existing tools was eventually abandoned in favor of exploring a new idea.
Dynamical Structure Function Identifiability Conditions Enabling Signal Structure Reconstruction, Julius Adebayo, Dr. Sean Warnick
Dynamical Structure Function Identifiability Conditions Enabling Signal Structure Reconstruction, Julius Adebayo, Dr. Sean Warnick
Journal of Undergraduate Research
Networks of controlled dynamical systems exhibit a variety of interconnection patterns that can be interpreted as the structure of a system. One such interpretation of system structure is a system’s signal structure, characterized as the open-loop causal dependencies among manifest variables and represented by its dynamical structure function (DSF). Previous work has shown that if no a priori structural information is known about the system, not even the Boolean structure of the dynamical structure function is identifiable. Consequently, one method previously suggested for obtaining the necessary a priori structural information is to leverage knowledge about target specificity of the controlled …
Message Protector: Demonstrating That Manual Encryption Improves Usability, Nathan I. Kim
Message Protector: Demonstrating That Manual Encryption Improves Usability, Nathan I. Kim
Theses and Dissertations
Billions of people currently use the Internet. Many Internet users share sensitive information through online services. Several secure data sharing tools have been developed to protect this sensitive information. A common practice in the design of usable security is to provide automatic data encryption that is transparent to users. We hypothesize that automatic encryption can decrease usability and comprehensibility, increasing the likelihood that users will unknowingly disclose sensitive information. This thesis presents Message Protector (MP), a novel Internet secure data sharing tool design that through manual encryption, purposely exposes technical details in a usable manner to increase usability and reduce …
Improving Crowd Simulation With Optimal Acceleration Angles, Movement On 3d Surfaces, And Social Dynamics, Brian C. Ricks
Improving Crowd Simulation With Optimal Acceleration Angles, Movement On 3d Surfaces, And Social Dynamics, Brian C. Ricks
Theses and Dissertations
Crowd simulation plays a critical role in modern films, games, and architectural design. However, despite decades of algorithmic improvements, crowds use sub-optimal heuristics, are primarily constrained to 2D surfaces, and show few if any social dynamics. This dissertation proposes that a solution to these problems lies in altering how each agent perceives its environment as opposed to new obstacle avoidance algorithms. First, this dissertation presents a theoretical look at optimal agent movement. Next, in order to place crowds on arbitrary 3D manifolds, algorithms are proposed that change how each agent perceives its environment. The resulting crowds move naturally across a …
Prevalence Of Reflexivity And Its Impact On Success In Open Source Software Development: An Empirical Study, Brandon D. Foushee
Prevalence Of Reflexivity And Its Impact On Success In Open Source Software Development: An Empirical Study, Brandon D. Foushee
Theses and Dissertations
Conventional wisdom, inspired in part by Eric Raymond, suggests that open source developers primarily develop software for developers like themselves. In our studies we distinguish between reflexive software (software written primarily for other developers) and irreflexive software (software written primarily for passive users). In the first study, we present four criteria which we then use to assess project reflexivity in SourceForge. These criteria are based on three specific indicators: intended audience, relevant topics, and supported operating systems. Based on our criteria, we find that 68% of SourceForge projects are reflexive (in the sense described by Raymond). In the second study, …
Probabilistic Explicit Topic Modeling, Joshua Aaron Hansen
Probabilistic Explicit Topic Modeling, Joshua Aaron Hansen
Theses and Dissertations
Latent Dirichlet Allocation (LDA) is widely used for automatic discovery of latent topics in document corpora. However, output from analysis using an LDA topic model suffers from a lack of identifiability between topics not only across corpora, but across runs of the algorithm. The output is also isolated from enriching information from knowledge sources such as Wikipedia and is difficult for humans to interpret due to a lack of meaningful topic labels. This thesis introduces two methods for probabilistic explicit topic modeling that address these issues: Latent Dirichlet Allocation with Static Topic-Word Distributions (LDA-STWD), and Explicit Dirichlet Allocation (EDA). LDA-STWD …
Probability Of Belonging To A Language, Kevin Michael Brooks Cook
Probability Of Belonging To A Language, Kevin Michael Brooks Cook
Theses and Dissertations
Conventional language models estimate the probability that a word sequence within a chosen language will occur. By contrast, the purpose of our work is to estimate the probability that the word sequence belongs to the chosen language. The language of interest in our research is comprehensible well-formed English. We explain how conventional language models assume what we refer to as a degree of generalization, the extent to which a model generalizes from a given sequence. We explain why such an assumption may hinder estimation of the probability that a sequence belongs. We show that the probability that a word sequence …