Digital Commons Network^™

Box-Fusion: A Way To Enhance The Pairwise Testing Approach, Omar Ochoa

Open Access Theses & Dissertations

Critical software systems that have failed due to the software errors are well documented. As our dependency on computer-based systems increases and such systems become more complex, software verification becomes even more important. Enhancing and improving the verification and defect correction techniques used in software engineering for the development of software systems is of utmost importance to keep pace with our increasing reliance on software.

Pairwise testing has emerged as an effective technique for software system-level testing that have large combinations of inputs, although a drawback is the lack of support for defect location. This research aims to increase the …

Synthesis, Characterization, And Functional Evaluation Of Nanocomposites For Water Purification, Julio Eduardo Padilla

Open Access Theses & Dissertations

The United Nations estimate that around 780 million people do not have access to clean and safe water and around 2.5 billion people do not have proper water sanitation. As a result, around 6-8 million people die each year due to water related diseases, such as cholera and dysentery, and disasters. As population increases the water problem will become more difficult to solve. Furthermore, climate change threatens to intensify water scarcity. The design of functional materials at the nanoscale offer unique solutions in molecular sorbents and catalytic systems that can develop into cost-effective solutions in water treatment by reducing the …

Insights Into Volcanic Processes Using Seismic Data Techniques, Ezer Patlan

Open Access Theses & Dissertations

We present in this study numbers of technique to understand the volcanic processes using seismology. The types of techniques we used are earthquake location (double difference travel-time, cross-correlation tremor technique, and time reversal), stresses (b-values, focal mechanism), and tomography imagery (ambient noise tomography). The areas of study we focus on are in two different tectonic settings. The East Africa Rift System at Kenya, studying four volcanoes: Menengai Caldera, Silali, Paka, and Korosi volcanoes. The other area of study is located in a subduction zone in Central America, Salvador at San Miguel volcano.

In this study we aim to calculate accurate …

Environmental Dynamics: A Compendium Of Rhetorical Application, Annalisa Perez

Open Access Theses & Dissertations

Technology, albeit exceedingly useful, has exponentially exacerbated the communications dilemma between the technical and the non-technical. Additionally, based on a current new understanding of the term environmental, it can no longer be fully defined by terms such as air, water, waste, or purification. Rather, the meaning of environmental has been globally transformed in several ways. The term environmental is encompassing an expansion of understanding and is further defined with words such as essence, perception, rapport and multi-dimensional spaces. This work, Environmental Dynamics: A Compendium of Rhetorical Application (EDC), provides a framework where communication can be enhanced in areas where communication …

Application Of Secondary Analyses On Industrial Data Sets, Luis G. Perez

Open Access Theses & Dissertations

Secondary analysis on quantitative data sets is the in-depth analysis of relationships, trends, patterns or behaviors that are not obvious from a superficial examination of data but that can be very germane in the application of that data. The present work presents a framework for investigators to use in applying secondary analysis on big data that correlates to the research topic. The framework can facilitate the illumination of possible data behaviors or patterns that could be useful in arriving at an answer to a question. Behavior of monitored equipment (analyzers, meters, etc.) can easily be depicted and can be used …

An A Posteriori Error Estimator For The C0 Interior Penalty Approximations Of Fourth Order Elliptic Boundary Value Problem On Quadrilateral Meshes, Mohammad Arifur Rahman

Open Access Theses & Dissertations

Numerical solutions of fourth order elliptic problems with finite element methods has been the topic of research in computational mechanics for over 50 years. Traditional approaches to solve these problems include using C1 conforming finite element methods which demand the C1 continuity of the underlying shape functions, which is computationally very expensive. In this work, we will present the C0 Interior Penalty Galerkin approximation of the fourth order elliptic problems which relies only on continuous i.e., C0 shape functions, which is much cheaper to implement. The spatial discretization is based on quadrilateral meshes and the underlying C0 shape functions are …

An Effective And Optimal Quality Control Approach For Green Energy Manufacturing Using Design Of Experiments Framework And Evolutionary Algorithm, Juan Alejandro Saavedra

Open Access Theses & Dissertations

Quality Control (QC) and Quality Assurance (QA) strategies vary significantly across industries in the manufacturing sector depending on the product being built. Such strategies range from simple statistical analysis and process controls, decision-making process of reworking, repairing, or scraping defective product. This study proposes an optimal QC methodology in order to include rework stations during the manufacturing process by identifying the amount and location of these workstations. The factors that are considered to optimize these stations are cost, cycle time, reworkability and rework benefit. The goal is to minimize the cost and cycle time of the process, but increase the …

Identifying Non-Classical Active Sites As A Tool For Enzyme Inhibition, Marisol Serrano

Open Access Theses & Dissertations

Chagas disease, caused by the parasite Trypanosoma cruzi, is an endemic life-threatening disease that affects mainly the heart. It remains the leading cause of heart failure in Latin American countries. Since current treatments against this parasite are highly toxic and somewhat ineffective, novel and more efficacious types of interventions are desired. Cruzain, identified as the major cathepsin for T. cruzi, plays a major role in the parasite's life cycle; making this enzyme very attractive for potential trypanocidal drugs discovery. The recombinant cruzain is synthesized as a zymogenic pro-protein (PCZN) which possesses a pro domain and a catalytic domain. In this …

Using Word Embeddings For Text Classification In Positive And Unlabeled Learning, Emmanuel Carlo Tafoya

Open Access Theses & Dissertations

Machine Learning is a sub-field of Artificial intelligence that aims to automatically improve algorithms by experience. It has been used successfully to solve various problems, such as playing checkers, or even as simple as word prediction when typing a sentence. These algorithms perform best with large amounts of training data. The more labeled data, the better a machine learning algorithm will be able to recognize patterns. However, the ideal scenario, where there is a large amount of labeled data available to train the algorithm, does not occur all the time. There are cases where labeling data is both time-consuming and …

Fabrication And Testing Of Cfrp Composites With Embedded Piezoelectric Particles For Temperature Sensing And Energy Harvesting, Emilio Tarango Valles

Open Access Theses & Dissertations

As a part of this world's continuous evolution and technological advancements, smart materials and functional composites have become an attractive topic. In many cases, these new functional composites are replacing the traditional engineering material due to their customizable mechanical properties. This Thesis analyzes and demonstrates the signal response, sensing capabilities and structural properties from Carbon/Glass Fiber Reinforced Plastic Composites (CFRP) with embedded Lead Zirconate Titanate Particles (PZT). The added PZT particles function as actuators, giving the composites a functionality. The PZT quantity inside each composite was variated to study better and characterize the mechanical and electrical properties; the variations were …

Computer Technology Implementation In A Mexican Elementary School, Griselda Terrazas

Open Access Theses & Dissertations

The purpose of this Thesis is to identify and understand how Computer Technology can be used to strengthen the quality of primary education in Mexico and to explore the influence of CT on students' motivation and success. The study will be focused primarily on the teachers' knowledge, their skill levels in using computers, and in the teachers' interest in integrating CT into the students' curriculum.

Complex Gleason Measures And The Nemytsky Operator, Miguel Angel Valles

Open Access Theses & Dissertations

This Thesis is devoted to generalize previous results on Gleason measures

to complex Gleason measures, and to develop a functional calculus

for complex measures in relation to the Nemytsky operator. Furthermore

we present the interpretation of our results in the field of quantum

mechanics, some concrete examples and further extensions of several

theorems.

A Rhetorical Theory Of Institutions, Paul Jay Vierra

Open Access Theses & Dissertations

How an institution remembers itself affects its practices and the ensuing knowledge produced. This is a result of the differences between truths and knowledge, which are based on beliefs. Beliefs are defined using either pragmatic language, which is based on observations and can be justified, or fictive language, which cannot be justified. The practices of an institution can be affected by the beliefs of the institution, which in turn affects scholarship. Modern research universities, such as the University of Texas at El Paso, must turn their research gaze not only outward, but also inwards in order to better serve society. …

A New Test For The Mean Vector In High Dimensional Setting, Behzad Aalipur Hafshejani

Open Access Theses & Dissertations

Traditional statistical data analysis mostly includes methods and techniques to deal with problems in which there are many observations but a few variables. Nonetheless, the current inclination is toward more observations but also, toward more variables. Today's observations gathered on individuals are images, curves, or even movies. Unfortunately many traditional methods do not work well in high dimensional settings. As an example Hotelling's test which is well known and widely used in the literature does not work when it comes to high dimensional problems. Consequently statisticians are making an effort to find remedies or new approaches to multivariate mean testing. …

Bioavailability Of Metal/Metal Oxide Nanomaterials And Their Effects On The Physiology Of Plants, Nubia Zuverza Mena

Open Access Theses & Dissertations

Nanoparticles (NPs) contained in consumer products will undoubtedly reach the environment. Engineered nanomaterials (ENMs) may cause physiological and biochemical alterations in plants and, therefore, have noteworthy effects on their growth and proliferation. Edible plants are a means through which NPs can reach organisms of higher trophic levels that feed on them. Previous studies have demonstrated that there are strong interactions between NPs and terrestrial plants. This project intends to evaluate the impacts that various commercially available NPs have on plants. Copper (Cu) nanomaterials and conventional Cu compounds were compared in cilantro plants (Chapter 2). In addition, changes in radish sprouts …

Information Entropy Measures Applied To Hierarchial Complex Technical And Socio-Technical Systems, Satya Aditya Akundi

Open Access Theses & Dissertations

A significant increase of Systems-of-Systems (SoS) is currently observed in the social and technical domains. With increasing constituent components, Systems of Systems are becoming larger and more complex. Recent research efforts have highlighted the importance of identifying innovative statistical approaches for analyzing complex systems to better understand how they work. This research is aimed towards developing an Information Entropy based framework to analyze complex technical and social systems. Entropy in terms of information theory can be seen as the expected amount of information observed in an event. A parallel can be drawn between information entropy and system complexity, where, as …

Geophysical Constraints On The Hueco And Mesilla Bolsons: Structure And Geometry, Victor Manuel Avila

Open Access Theses & Dissertations

The Hueco and Mesilla Bolsons are part of the intramountain basins of the Rio Grande Rift system. These bolsons are the primary source of groundwater for the El Paso-Ciudad Juarez metropolitan area and contain faults that show evidence of repeated earthquakes during the Quaternary. The region is also associated with has low-level (M<4) seismicity. The collection and analysis of precision gravity data, coupled with information from water wells, multichannel analysis of surface waves (MASW) studies and previously published seismic reflection lines, have been used to examine the structure and faulting within these bolson. This study reveals that the Hueco and Mesilla Bolsons are very different structurally. The southern Mesilla Bolson contains about 500 m of sediment. Faults are difficult to trace and have less than 50-100 m of displacement across them. The southernmost bolson contains numerous Tertiary intrusions and the thickness of Cretaceous bedrock appears to decrease from south to north, possibly delineating the edge of Laramide age deformation within the bolson. The northern Hueco Bolson contains 1800 to 2500 m of basin fill. Displacement along the East Franklin Mountains fault (EFMF), a fault with evidence for repeated earthquakes within the past 64,000 years, is about 1500 m, and displacement on intrabasin faults is 200-300 m. Several intrabasin faults appear to control the saline to freshwater contact within the bolson. The EFMF may extend over 30 km south of the end of its mapped trace at the end of the Franklin Mountains and a number of intrabasin faults also extend south into the urbanized regions of the study area. The EFMF and other basin structures appear to be offset or disrupted at the speculated edge of Laramide deformation that lies beneath the bolson. Horizontal Gradient Methods (HGM) were applied to the gravity data and were successful for tracing faults and older Laramide features within the Hueco Bolson beneath the urbanized regions of the cities. HGM were not as successful at tracing faults within the Mesilla Bolson, however they were helpful for tracing the subsurface extent of igneous intrusions including the Mt. Cristo Rey, River, Three Sisters, and the Westerner outcrops. Some of these features appear linked at depth by a series of dikes and faults. MASW data were used to determine the average shear wave velocity in the upper 30m (Vs 30) at ~70 sites within the Hueco Bolson. These observations were combined with similar data collected previously in Juarez to produce regional velocity and site classification maps. The results show low velocities are found close to the river within fluvial deposits with higher velocities close to the Franklin Mountains where bedrock is close to the surface and higher velocities in upland regions of northeast El Paso were soils appear to be more highly cemented. These data will be used in conjunction with information on bolson geometries to model the expected effects of strong ground motion from earthquakes in the El Paso-Ciudad Juarez region.

Manufacturing And Characterization Of Energetic Materials, Carlos Alberto Catzin

Open Access Theses & Dissertations

Few products take several years of research effort to be synthesize yet disintegrate in scarcely millionths of a second when used. Despite their short lifespan energetic materials, particularly high explosives, are in demand as never before by the Aerospace, Defense, Energy, Gas, Mining, and Oil Industry for their unique properties. One class of high explosives known as polymer bonded explosives (PBXs) are popularly used in a wide variety of applications ranging from solid rocket propellants to the main explosive charge in conventional ammunitions. A key characteristic behind the popularity of PBXs in comparison to other high explosives is their handling …

Reliable And Secure Scada Framework For Residential Microgrid Communications, Goutham Krishna Chalamasetty

Open Access Theses & Dissertations

Cyber security is one of the major needs for electric power industry like many other industries and organizations. The advancements in technology provide numerous benefits to power industry as well as benefits cyber attackers to perform different cyber-attacks on the industry. Power system is a complex physical entity that deals with power generation, distribution, and transmission. In general, no individual or company or an organization can bear a one hour power cut, which shows the need for reliability in electric power industry.

In order to develop a reliable and secure Supervisory Control and Data Acquisition (SCADA) communication network, this Thesis …

Minimizing Environmental Impacts For Hub And Spoke Distribution Network Problems Through The Use Of Multi-Objective Evolutionary Algorithms, Ileana Delgado

Open Access Theses & Dissertations

While transportation is crucial to our economy and our personal lives, as a sector it is also a significant source of greenhouse gas (GHG) emissions. The AASHTO report states, "America's transportation system has served us well, but now faces the challenges of congestion, energy supply, environmental impacts, climate change, and threatens the economic, social, and environmental future of the nation". With respect to the environment, transportation is the most visible aspect of supply chains. Transportation emissions can be reduced by implementing approaches that contribute to GHG emissions reduction, for example, the use of low-carbon fuels, new and improved vehicle technologies, …

Sedimentologic And Stratigraphic Analysis Of Synrift Siliciclastic Fluvial And Lacustrine Strata In The Lower Cretaceous Upper Yucca Formation, Indio Mountains, West Texas, Matthew Robert Fox

Open Access Theses & Dissertations

Outcrops of the upper Yucca Formation in the Indio Mountains near Van Horn, Texas provide temporal, tectonic, and climatic similarities to Lower Cretaceous, synrift, greenhouse pre-salt lacustrine strata along in the subsurface of the South Atlantic margin. These "pre-salt" strata hold prolific petroleum reservoirs but despite extensive seismic studies performed for regional scale hydrocarbon exploration in these lacustrine reservoirs, sedimentologic and stratigraphic analyses have rarely been published. The Upper Yucca Formation in the Indio Mountains contain lacustrine reservoir analogs that intertongue with fluvial and deltaic sandstones. Near Squaw Canyon, fluvial-deltaic sandstones are reduced in abundance to lacustrine carbonates by nearly …

Analysis Of English Language Learner Student Reasoning About Measures Of Center And Variation: A Triangulation Of Quantitative And Qualitative Data, Lorena Galvan

Open Access Theses & Dissertations

The population of Spanish-speaking English Language Learner (ELL) students has been growing rapidly in the past 20 years. It has been estimated that by the year 2018, 1 out of 4 students in grades K-12 will be an ELL. There is a large body of research about assessment of Spanish-speaking ELL students in mathematics; however, there is little that focuses on statistics only. Statistics courses are frequently confused and/or classified under mathematics courses. However, students taking an introductory statistic course are required to know a new set of concepts, words and vocabulary that are not always used in mathematics courses. …

Decision Making And The Law: Truth Barriers, Jonathan J. Koehler, John B. Meixner Jr.

Scholarly Works

Reaching an accurate outcome is a central goal of the American trial. But structural features of the legal system, in combination with the cognitive shortcomings of legal actors, hinder the search for truth. Regarding the legal system, various rules and policies restrict decision makers’ access to evidence, violate the laws of probability, and limit the evidentiary concerns that may be considered on appeal. Regarding legal actors, informational deficits (particularly regarding scientific and statistical evidence) and cognitive biases of police investigators, witnesses (lay and expert), attorneys, judges, and jurors pose serious obstacles. We conclude by suggesting that research in judgment and …

Statement, Winter 2016, Office Of Alumni Relations. Morehead State University

Morehead State Alumni Association Publications

Statement Magazine of Morehead State University from Winter of 2016.

Drinking Water And Autism: Using Spatial Cluster Detection To Explore Patterns Of Autism Cases In Lane County, Oregon, Sherry Sandreth

Walden Dissertations and Doctoral Studies

Autism Spectrum Disorders (ASD) are a complex array of neurological disorders with a diverse presentation, multiple etiologies, and long-term ramifications. Prevalence of ASD in the United States is about 1 in 50 children as of 2013, making it a significant public health problem. The etiology is not understood, and it is widely accepted that it is multicausal, with genetic and environmental influences. Prior research suggests an association between water source and ASD. Contaminants such as lead, arsenic, mercury, pharmaceuticals and pesticides found in water are associated with developmental disorders suggesting that a systematic review focused on water source was warranted. …

Virtual Education: Not Yet Ready For Prime Time?, Michael K. Barbour

Education Faculty Publications

The field of K–12 online and blended learning is varied and growing. Regardless of whether a student is enrolled in a brick-and-mortar school and taking one or two courses online, or if they are completing all of their education from a cyber school, more and more students are enrolled in online and blended learning opportunities each school year. Over the past decade, there have been successive legislative and regulatory changes in jurisdiction after jurisdiction designed to encourage this growth in K–12 online and blended learning. Many of these changes have been spurred by proponent claims that K–12 online and blended …

Historical Trends And Emerging Issues In Teacher Education Programs In The United States, Karl M. Lorenz

Education Faculty Publications

US national and state educational polices are advocating for more teacher accountability with respect to student performance, and accrediting agencies are requiring more evidence of teachers’ mastery of subject area knowledge and professional skills. This paper examines some of the significant educational and social issues currently facing basic education and teacher preparation programs in the United States. It addresses numerous topics and focuses on five general issues that confront K-12 education and either directly or indirectly Teacher Preparation Programs.

Las políticas educativas nacionales y estatales de Estados Unidos están abogando por una mayor responsabilidad de los maestros con respecto al …

There Is More To Gesture Than Meets The Eye: Visual Attention To Gesture’S Referents Cannot Account For Its Facilitative Effects During Math Instruction, Miriam A. Novack, Elizabeth M. Wakefield, Eliza L. Congdon, Steven Franconeri, Susan Goldin-Meadow

Psychology: Faculty Publications and Other Works

Teaching a new concept with gestures – hand movements that accompany speech – facilitates learning above-and-beyond instruction through speech alone (e.g., Singer & GoldinMeadow, 2005). However, the mechanisms underlying this phenomenon are still being explored. Here, we use eye tracking to explore one mechanism – gesture’s ability to direct visual attention. We examine how children allocate their visual attention during a mathematical equivalence lesson that either contains gesture or does not. We show that gesture instruction improves posttest performance, and additionally that gesture does change how children visually attend to instruction: children look more to the problem being explained, and …

Comparing Process-Based And Constraint-Based Approaches For Modeling Macroecological Patterns, Xiao Xiao

Biology Faculty Publications

Ecological patterns arise from the interplay of many different processes, and yet the emergence of consistent phenomena across a diverse range of ecological systems suggests that many patterns may in part be determined by statistical or numerical constraints. Differentiating the extent to which patterns in a given system are determined statistically, and where it requires explicit ecological processes, has been difficult. We tackled this challenge by directly comparing models from a constraint-based theory, the Maximum Entropy Theory of Ecology (METE) and models from a process-based theory, the size-structured neutral theory (SSNT). Models from both theories were capable of characterizing the …

Managing The Spread Of Alfalfa Stem Nematodes (Ditylenchus Dipsaci): The Relationship Between Crop Rotation Periods And Pest Re-Emergence, S. Jordan, Claudia Nischwitz, Ricardo A. Ramirez, L. Gordillo

Biology Faculty Publications

Alfalfa is a critical cash/rotation crop in the western region of the United States, where it is common to find crops affected by the alfalfa stem nematode (Ditylenchus dipsaci). Understanding the spread dynamics associated with this pest would allow end-users to design better management programs and farming practices. This is of particular importance given that there are no nematicides available against alfalfa stem nematode and control strategies largely rely on crop rotation to non-host crops or by planting resistant varieties. I present a basic host-parasite model that describes the spread of the alfalfa stem nematode on alfalfa crops. With this …