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Work In Progress - Virtual Facilitation And Procedural Knowledge Education, Ray Luechtefeld, Steve Eugene Watkins

Electrical and Computer Engineering Faculty Research & Creative Works

Engineering students acquire both conceptual and procedural knowledge as part of their education. While conceptual knowledge, such as understanding why certain design practices are required or having knowledge of the general principles of engineering development, is essential, procedural knowledge to enact specific engineering practices is also needed. This kind of knowledge, such as balancing chemical equations, solving calculus problems, or finding Thevenin-Norton equivalents, is usually taught through rote problem solving, sometimes with the guidance of teaching assistants or aid from the instructor if students find themselves "stuck". However, a Virtual Facilitator, designed to help students develop team skills, can also …

Comparison Of A Recurrent Neural Network Pv System Model With A Traditional Component-Based Pv System Model, Daniel M. Riley, Ganesh K. Venayagamoorthy

Electrical and Computer Engineering Faculty Research & Creative Works

Photovoltaic (PV) system modeling is used throughout the photovoltaic industry for the prediction of PV system output under a given set of weather conditions. PV system modeling has a wide range of uses including pre-purchase comparisons of PV system components, system health monitoring, and estimation of payback (return on investment) times. in order to adequately model a PV system, the system must be characterized to establish the relationship between given weather inputs (e.g., irradiance, spectrum, temperature) and desired system outputs (e.g., AC power, module temperature). Traditional approaches to system characterization involve characterizing and modeling each component in a PV system …

Optimized Built-In Self-Test Technique For Caen-Based Nanofabric Systems, Sambhav Kundaikar, Maciej Zawodniok

Electrical and Computer Engineering Faculty Research & Creative Works

We propose a built-in self-test (BIST) technique for testing and diagnosis of molecular electronic based nano fabrics. the nano fabric architectures are reconfigurable in nature thus making it possible to utilize general methods similar to those employed for testing of FPGAs. However, a high defect rate in nano fabrics renders the traditional techniques ill-suited. Moreover, the nano blocks offer potential for using a partially damaged nano block due to inherent redundancy of the architecture. This paper presents the design and analysis of testing configurations and optimization scheme that minimizes testing time while improving the utilization of the nano fabric. the …

Soft-Decision Feedback Turbo Equalization For Multilevel Modulations, Huang Lou, Chengshan Xiao

Electrical and Computer Engineering Faculty Research & Creative Works

Error propagation phenomena is the major drawback for existing hard-decision feedback turbo equalizers. in this paper, we propose a new soft-decision feedback equalizer (SDFE) suitable for multilevel modulation systems employing turbo equalization. the proposed SDFE offers a low computational complexity growing only linearly with the number of equalizer coefficients, as opposed to the quadratic complexity of MMSE-Based linear turbo equalizer with time-varying coefficients (Exact-MMSE-LE). the performance and convergence property of the proposed SDFE are analyzed using extrinsic information transfer (EXIT) chart and verified by simulations in a severe InterSymbol interference channel set by Proakis. Results show that our approach performs …

3d Image Reconstruction From Sparse Measurement Of Wideband Millimeter Wave Sar Experiments, Hamed Kajbaf, Joseph T. Case, Yahong Rosa Zheng

Electrical and Computer Engineering Faculty Research & Creative Works

Nonuniform random sampling is applied to a wideband 3D synthetic aperture radar (SAR) imaging system to reduce the number of measurement points in both frequency and space domains. Experimental tests were performed on a construction foam specimen using uniformly sampled Q-band frequencies in 35.04 GHz to 44.96 GHz and at a grid of two-millimeter step sizes. using discrete Fourier transform (DFT) or discrete cosine transform (DCT) sparse representations, the 3D images can be reconstructed from 7% random samples of the experimental data achieving comparable quality as the one from original full-set data. This can translate to significant time reduction of …

Mahalanobis-Taguchi System As A Multi-Sensor Based Decision Making Prognostics Tool For Centrifugal Pump Failures, Ahmet Soylemezoglu, Sarangapani Jagannathan, Can Saygin

Electrical and Computer Engineering Faculty Research & Creative Works

A novel Mahalanobis Taguchi System (MTS) based fault detection, isolation, and prognostics scheme is presented. the proposed scheme fuses data from multiple sensors into a single system level performance metric using Mahalanobis Distance (MD) and generates fault clusters based on MD values. MD thresholds derived from the clustering analysis are used for fault detection and isolation. When a fault is detected, the prognostics scheme, which monitors the progression of the MD values over time, is initiated. Then, using a linear approximation, time to failure is estimated. the performance of the scheme has been validated via experiments performed on a mono-block …

"The Course Fit Us": Differentiated Instruction In The College Classroom, Mary Volesky Dosch

Theses and Dissertations

Differentiated instruction is a learner-centered philosophy of teaching based on Tomlinson’s research, but stems from a constructivist belief espoused by Dewey, Piaget, and Vygotsky. Through consideration of three diagnostic areas: readiness, interests, and learning profiles, a teacher differentiates how diverse students access the material (content), how students make sense of the material (process), and how students demonstrate their learning (product).

Differentiated instruction has been used successfully at the elementary, middle, and high school levels showing quantitative improvements for diverse students. A limited number of qualitative studies on differentiated instruction exist at the college level, with even fewer quantitative studies.

The …

Application Of Genetic Algorithm For Synthesis Of Large Reversible Circuits Using Covered Set Partitions, Maher Mofeid Hawash, Baker Abdalhaq, Amjad Hawash, Marek Perkowski

Electrical and Computer Engineering Faculty Publications and Presentations

We present the results of application of Evolutionary Algorithms to the problem of synthesizing quantum circuits which belong to the class of reversible circuits, represented as an input/output mapping vectors. The paper specifically focuses on large quantum circuits where many valid solutions exist in an exponentially inflating search space. Valid solutions represent the set of all input vector permutations (arrangements) which satisfy the circuit specification. The search space for circuits with large number of variables grows exponentially making it impossible to discover the set of optimal solutions. The paper compares three methods for selecting valid solutions of input vector sequences: …

Design And Fabrication Of Nanofluidic Systems For Biomolecule Characterizations, Orain Ansel Hibbert

Graduate Theses and Dissertations

Nanofluidic channel systems were designed and fabricated by combining MEMS microfabrication with AFM nanolithography. In the fabrication process flow, photolithography was first utilized to pattern microfluidic channels and reservoirs on a 4" Pyrex substrate. Subsequently, atomic force microscopy (AFM) based nanolithography was used to mechanically fabricate nanochannels to connect the microreservoirs which formed the inlet and outlet of the nanofluidic system. A Tap190 Diamond-Like Carbon (DLC) AFM tip with a force constant of 48 N/m and a radius of less than 15 nm was used as the nanolithography tool. The resultant nanochannel ranges from 20 to 80 µm in length …

Synthesis Of Zinc Oxide Nanorods And Use In Biosensor Applications, Anishkumar Manoharan

Graduate Theses and Dissertations

The main aim of this research was to develop a nanorod based biosensor for biomedical applications. In this project I use zinc oxide nanorods as the bio-material for biosensor. I fabricated these nanorods using a solution-based technique. Initially I coated a zinc oxide seed layer as the base. This seed layer was then annealed at 350 degrees for almost 1 hour. As a next step, interdigitated electrodes were fabricated on the top of the seed layer using a lift off process. The zinc oxide nanorods were then grown at 90 degrees for almost 4 hours along the electrodes. In this …

Evaluating The International Criminal Court: A Comparative Analysis Of Darfur, Sudan, And The Democratic Republic Of The Congo, Mirisa Hasfaria

Graduate Theses and Dissertations

This thesis examines the effectiveness of the International Criminal Court (ICC) in holding individuals accountable for grave breaches of crimes against peace, war crimes, crimes against humanity, and genocide. I argue that if we measure effectiveness in terms of the ability to set agenda and to publicize, the ICC accomplishes much. My thesis to shows that, as a key part of the international agenda on human rights compliance, the ICC derives its effectiveness from the various naming and shaming campaigns by national governments and non-governmental actors (NGOs).

I draw on the cases of Darfur, Sudan and the Democratic Republic of …

Mathematically Gifted Students' Experiences Of Challenge With Cognitively Guided Instruction, Kim Krusen Mccomas

Graduate Theses and Dissertations

This study examined to what extent and in what ways mathematically gifted students were challenged in two elementary classrooms taught by exemplary teachers using the principles of Cognitively Guided Instruction (CGI). The two case studies included a third grade class and a fourth/fifth split grade class, with five mathematically advanced participants from each grade. A top tier and a second tier of mathematically advanced students were identified, with the top tier of five students identified as mathematically gifted. Classroom observations of CGI math lessons, interviews with students and teachers, and analysis of students' problem-solving strategies were conducted over a five …

The Thundering Throne: Personality, Poetics, And Gender In The Court Of King Henry Viii, Rebecca Marie Moore

Graduate Theses and Dissertations

This work examines gender in the court of King Henry VIII, focusing specifically on the role that the power and weight of Henry's personal decisions played in shaping the contemporary Social definitions of femininity, masculinity, and courtiership. The space of courtiership is particularly open to such inquiry because this space was so often one that revealed the fissures and failures in attempts to maintain the strict binaries that privileged hegemonic masculinity under Henry. These definitions, then, will be reflected in, as well as shaped by, court poetry and, as explored in the final chapter, prose. Literature produced within the context …

Geospatial Tools And Techniques For Watershed Management Using Swat 2009, Naresh Pai

Graduate Theses and Dissertations

In this study, geospatial tools and techniques were developed to support specific aspects of watershed pollution management, such as quantifying land-use change (LUC) impacts, prioritizing subwatersheds, and communicating field-scale impacts, using the soil and water assessment tool 2009 (SWAT 2009) model.

For the land-use change objective, a geospatial tool titled SWAT2009_LUC was developed that enables SWAT modelers to prepare specific input files for simulating concurrent land-use changes during the SWAT 2009 model simulations. Testing of the tool for the Illinois River Drainage Area in Arkansas (IRDAA) watershed showed that the tool accurately represented temporal land-uses within the model. Model simulations …

Modeling And Characterization Of P-Type Silicon Carbide Gate Turn Off Thyristors, Osama Shihadeh Saadeh

Graduate Theses and Dissertations

Silicon carbide (SiC) power semiconductor devices have emerged in the past decade as the most promising technology for next generation power electronic applications ranging for electric vehicles to grid-connected power routing and conversion interfaces. Several devices have been developed, and even some have been released commercially, including diodes, MOSFETs, JFETs, thyristors, gate turn-off thyristors, and IGBTs. The model development, characterization and experimental validation of SiC p-type Gate Turn-off Thyristors (GTO) is presented in this work. The GTO device in this work is being used as part of a SiC-based solid-state fault current limiter under development at the University of Arkansas' …

Effect Of Soyasaponin Fractions On Human Colon Cancer Cells, Joseph Tyler Salyer

Graduate Theses and Dissertations

Group B saponins, the predominant form of saponins in heat-treated soy products, have been shown to possess hypocholesterolemic, antimutagenic, and anticarcinogenic properties. Previous studies have evaluated crude mixtures of soyasaponins, but studies evaluating a single purified soyasaponin as an anticarcinogenic agent are limited. The goal of this study is to examine the effects of purified soyasaponins I and III as well as their aglycone form, soyasapogenol B, as anticarcinogenic agents on the human colon adenocarcinoma cell line Caco-2. Experiments were conducted to determine the effects of purified soyasaponins on cell proliferation, Protein Kinase C (PKC) activity, and cell morphology in …

The Final Transfer Of Power In India, 1937-1947: A Closer Look, Sidhartha Samanta

Graduate Theses and Dissertations

The long freedom struggle in India culminated in a victory when in 1947 the country gained its independence from one hundred fifty years of British rule. The irony of this largely non-violent struggle led by Mahatma Gandhi was that it ended in the most violent and bloodiest partition of the country which claimed the lives of two million civilians and uprooted countless millions in what became the largest forced migration of people the world has ever witnessed. The vivisection of the country into Hindu-majority India and Muslim-majority Pakistan did not bring the hoped for peace between the two neighbors. The …

Disclosing An Invisible Disability During The Interview Process: A Qualitative Study, John Elias Sassin

Graduate Theses and Dissertations

Rehabilitation professionals, persons with disabilities and employers were asked to participate in a focus group interview exploring the phenomena of disclosing invisible disabilities during the interview process. This Qualitative study examined disclosure of disability from each stakeholder's perspective in an effort to understand its impact on the interview. After transcribing the focus group interview and analyzing the data; five themes emerged reflecting each stakeholder's views on disclosure. The themes revealed the persistence of attitudinal barriers that people with disabilities face in seeking employment; if and when a person should disclose; what are the positive and negative aspects of disclosure and …

A Comparison Of Internet Marketing Methods Utilized By Higher Education Institutions, Joseph Clayton Mccoy

Graduate Theses and Dissertations

Use of Internet marketing techniques in higher education to attract prospective students is relatively new. While the research is recent, there are several studies that identify what is most valuable to students seeking information on college web sites. Higher education is now facing increasing competition from for-profit schools and reduced funding from typical sources. This study examines how two different Carnegie classifications use Internet marketing techniques and identifies if there is a difference in how much they use these techniques. Content techniques and search engine optimization (SEO) techniques were examined for 56 higher education institutions in this study. Of the …

Visualizing The Spatial Localization Of Active Matrix Metalloproteinases (Mmps) Using Maldi Imaging Ms, Sasirekha Muruganantham

Graduate Theses and Dissertations

Biomaterial implantation induces the foreign body response (FBR). Development of longer-term implants relies on the thorough understanding of the FBR. The progression of the FBR is regulated by a number of biomolecules including cytokines, chemokines, and matrix metalloproteinases (MMPs). The nature of the FBR requires the spatial and temporal regulation of these mediators. MMPs are an extremely large and diverse group of enzymes that play key roles in regulating the FBR. Precise spatiotemporal regulation of MMPs defines their proteolytic activities. The aim of this project is to develop a new bioanalytical method to visualize the localization of active MMPs at …

Investigation Of A Floating Load Buck Dc-Dc Switching Converter, Hong Tan

Graduate Theses and Dissertations

A floating load buck DC-DC switching converter was analyzed, simulated, designed and prototyped. The floating load buck converter is first compared to the conventional buck converter. It was found that both the floating load buck converter and conventional buck converter exhibit similar conversion characteristics despite the differences in the placement of their output inductors. A floating load buck converter was designed to be used as a high-voltage off-line light-emitting diodes (LEDs) driver using a Texas Instruments' TPS92001 controller. Finally, the characteristics of this floating load buck converter LED driver were experimentally examined.

Teachers' Perceptions Toward The Secondary Physical Education Program In The State Of Kuwait, Khaled A. Al-Kandari

Graduate Theses and Dissertations

The purpose of this research was to determine the perceptions of physical education teachers and supervisors toward the secondary physical education program in eight domains in the State of Kuwait. Stratified and cluster sampling were used to select two schools of female teachers and two schools of male teachers from each district (6 districts); therefore, 24 schools were selected randomly. One hundred thirty-eight physical education teachers were selected and 66 supervisors were selected. A four-point rating scale (i.e., strongly disagree to strongly agree) and open-ended questions were included in the survey. Cronbach's alpha reliability, descriptive statistics, and independent sample t …

Application Of The Empirical Mode Decomposition On The Characterization And Forecasting Of The Arrival Data Of An Enterprise Cluster, Linh Bao Ngo

Graduate Theses and Dissertations

Characterization and forecasting are two important processes in capacity planning. While they are closely related, their approaches have been different. In this research, a decomposition method called Empirical Mode Decomposition (EMD) has been applied as a preprocessing tool in order to bridge the input of both characterization and forecasting processes of the job arrivals of an enterprise cluster. Based on the facts that an enterprise cluster follows a standard preset working schedule and that EMD has the capability to extract hidden patterns within a data stream, we have developed a set of procedures that can preprocess the data for characterization …

Design Of An 866 Mhz On-Chip Frequency Synthesizer, Phaniraj Joshi

Graduate Theses and Dissertations

There is a strong need for stable frequency references with large tuning ranges in today's communication systems. While the crystal oscillators assure good frequency stability, it is not possible to achieve a large frequency range by tuning the passive components attached to them. Frequency synthesizers are usually used for this purpose because of their ability to produce a variety of output frequencies. The Phase Locked Loop (PLL) based frequency synthesizer is the most preferred of all types of synthesizers available because of its additional features like programmability, low noise and low cost as well as high accuracy and stability. The …

Perceptions Of Sexual Dangerousness: Accurate Identification Of Sexual Offenders From Static Photographs, Amber Jean Culbertson-Faegre

Graduate Theses and Dissertations

The present research expands understanding of the phenomenon of accurate identification of sexually dangerous men. Study 1 was designed to examine the influence of experience on accuracy of perceptions of sexual dangerousness. Receiving feedback about test trials increased accuracy on future trials at a marginally significant level. Study 2 was designed to determine the importance of specific facial features on these judgments. This study, however, failed to replicate the findings from the first study. Implications for Study 1, as well as possible explanations for Study 2 are discussed.

Cognitive Agendas And Legal Epistemology, Danny Marrero

Graduate Theses and Dissertations

The domain of legal epistemology is defined from two alternative perspectives: individual epistemology and Social epistemology. Since these perspectives have different objects of evaluation, their judgments privilege and exclude different sets of information. While methodological individualism is concerned with justified beliefs of individual knowers, the Social angle focuses on the institutional conditions of knowledge. I will show that the information that is respectively excluded by both the individual and the Social concepts of legal epistemology weaken their respective evaluations. With this in mind, I will explore one new option of defining legal epistemology. This alternative is more comprehensive, in the …

Creativity In Triadic Supervision: Using Mandalas To Impact The Working Alliance, Kelly Agnes Dunbar

Graduate Theses and Dissertations

This qualitative study investigated the use of mandalas as a creative approach with the potential to impact the supervisory working alliance within the context of triadic supervision. Participants (n=7) included master's level counselors-in-Training (CITs), all female, and ranging in age from 23 to 44. Data generated by the formal interviews gained support for using mandalas as a creative approach in triadic supervision as they revealed the potential to impact the working alliance and the goals, task, and bond therein. Of further importance was the finding that the bond between paired CITs in triadic supervision sessions was also impacted by the …

A Nietzschean Account Of Human Flourishing: Affirming The Will To Power Inside The Contours Of Friendship, Christian Joshua Roos

Graduate Theses and Dissertations

In this dissertation, I examine Friedrich Nietzsche's notion of the will to power, his account of friendship and his understanding of human flourishing. Through textual analysis, I offer a new way of interpreting the will to power, as the achieving of self-realization. The process of achieving self-realization is undergirded by the satisfaction of seven existential needs that are rooted in the paradoxical human conflict between instincts and consciousness. The existential needs are the need for a frame of orientation, the need for devotion, the need for unity, the need for rootedness, the need for stimulation, the need for effectiveness and …

Jurors' Ability To Judge The Reliability Of Confessions And Denials: Effects Of Camera Perspective During Interrogation, Lindsey Nicole Sweeney

Graduate Theses and Dissertations

Previous research shows that some proportion of people interrogated confess, regardless of actual guilt. It has also been shown that the camera perspective from which an interrogation is videotaped influences later judgments of voluntariness and guilt, as well as sentencing recommendations. The present research extends the understanding of this phenomenon of false confessions and the camera perspective bias. Ecologically valid videotaped true/false confessions and denials were obtained in Experiment 1. The proportions of guilt participants and participants that confessed to cheating were found to be smaller in Experiment 1 than those in previous research. Participants in Experiment 2 viewed the …