Digital Commons Network^™

Becoming Artifacts: Medieval Seals, Passports And The Future Of Digital Identity, Mawaki Chango

School of Information Studies - Dissertations

What does a digital identity token have to do with medieval seals? Is the history of passports of any use for enabling the discovery of Internet users' identity when crossing virtual domain boundaries during their digital browsing and transactions? The agility of the Internet architecture and its simplicity of use have been the engines of its growth and success with the users worldwide. As it turns out, there lies also its crux. In effect, Internet industry participants have argued that the critical problem business is faced with on the Internet is the absence of an identity layer from the core …

Ambient Intelligence With Wireless Grid Enabled Applications: A Case Study Of The Launch And First Use Experience Of Wejay Social Radio In Education, Helen Patricia Mckenna

School of Information Studies - Dissertations

Wireless grid and ambient intelligent (AmI) environments are characterized as supportive of collaboration, interaction, and sharing. The conceptual framework advanced for this study incorporated the constructs of innovation, creativity and context awareness while offering emergence theory -- emergent properties, structures, patterns and behaviors -- to frame and investigate a wireless grid enabled social radio application which was theorized to be potentially transformative and disruptive. The unintended consequences and unexpected possibilities of wireless grid and smart environments were also addressed.

Using a single case study, drawing upon multiple data collection methods, this research investigated the deployment and use experience of …

The Power Of Systemic Fraud: Implications For The Fraud Triangle From The Professional Investing Community, Joseph Wall

Student Scholarship

Fraud is a powerful tool for profit in organizations and for individuals. Professional investors control more than half the world's GDP and continue to commit fraud at an increasing scale which threatens entire countries and regions. Auditors utilize the framework of the fraud triangle for detection and deterrence. However, when fraud is systematic, both become challenging. Literature is silent concerning the lived experiences of the professional trading community, and there is a paucity of knowledge regarding fraud within it. Semi-structured interviews with 31 professional investors yielded insights into how fraud functions. Our analysis suggests that while opportunity and capability hold …

Hopeful Measures: Characteristics Of Hope At A Community College, Thomas C. Priester

Education Doctoral

Snyder’s Hope Theory defines the construct of hope as the “sum of perceived capabilities to produce routes to desired goals, along with the perceived motivation to use those routes” (Snyder, 2000, p. 8). Hope is a tenant of positive psychology that can be used to measure personal as well as academic potential (Seligman, 2002). In fact, Lopez (2009) claims that “hope predicts GPA and retention in college, and hope scores are more robust than high school GPA, SAT, and ACT scores.” Researchers have measured the relationship between hope and academic performance in college students at four-year, baccalaureate degree granting institutions …

Strategies And Actions Used By Stem Degree Seeking Adult, Full-Time, Undergraduates: A Grounded Theory Study, Adwoa Boateng

Education Doctoral

Higher education research focuses on traditional undergraduates under the age of 25 years. The focus of the researcher’s study was on the academic experiences of adult, full-time, STEM undergraduates 25 years of age and older. The purpose of the study was to identify strategies and actions adult students use towards their academic success while enrolled in science, technology, engineering, and mathematics (STEM) programs. The Grounded Theory Method was utilized as the qualitative approach to iteratively generate a theory based on the experiences of adult, full-time undergraduates in STEM programs. The significance of the proposed study was an opportunity to provide …

The Impact Of Superintendent Turnover On Student Achievement In Rural Districts, Rebekah Parker-Chenaille

Education Doctoral

The field has gained knowledge in the area of superintendent influence on student achievement; however, more research on superintendent turnover and its impact on organizational performance in a rural context is needed. Student achievement measures have become the primary indicator of school, principal, teacher, and student success (New York: Race to the Top State Scope of Work, 2011) and has become a measure of the superintendent’s performance. Using time series data analysis with twelve years of district data across the 21 schools studied, results indicated that superintendent turnover did impact student achievement. The motive of the superintendent, examined in this …

Synthesis And Luminescence Properties Of Core-Shell Structured (Lanthanum(1-X)Europium(X))(2)Zirconium Heptoxid[At]Yttrium Orthoborate Spherical Nanoparticles, Suresh Babu Alaparthi

Theses and Dissertations - UTB/UTPA

Many rare earth compounds have photoluminescent characteristics for various important applications. In this study, europium doped La2Zr2O7 nanoparticles were first synthesized morphology-controllably by using a molten-salt synthesis method. These nanoparticles were used as the core for coating with YBO3 shell. We then explored the effect of different experimental processing parameters, such as annealing temperatures, reaction times and different ratios of salt mixtures on the structure and morphology of these nanoparticles. The overall core size and shell thickness can be controlled by varying the reactant concentration both the core and shell material. These core@shell nanoparticles were then characterized mainly using power …

Development Of A Vibration And Temperature Measurement Device For Railroad Bearings, Andrea P. Arguelles

Theses and Dissertations - UTB/UTPA

Bearing related derailments cause very high cost and inconvenience to the railroad industry. Various wayside detection systems have been implemented to assess bearing condition and prevent premature failure. However, current devices fail to determine the internal condition of bearings or provide insight regarding the danger and severity of defects and abnormalities that may be present. To this end, a device combining both temperature and vibration detection was designed to be embedded in railroad bearing adapters. In order to efficiently design a railroad bearing condition-monitoring system, two factors that must be considered are the capabilities available to operate the different sensors …

School Type And Student Achievement: Does School Type Affect Student Achievement In Hidalgo County, Texas?, Krystal Estarei Garcia

Theses and Dissertations - UTB/UTPA

This study concentrates on identifying whether school type affects student achievement. Throughout this thesis, school type is the independent variable and student achievement is the dependent variable. School type was measured according to whether the school was classified as either a public school or charter school. In addition, school type was further defined according to the following variables: total academic and administrative staff, number of principals, number of assistant principals, school size, number of teachers, student teacher ratio, and student type. School expenditures, time, and method of teacher certification are the control variables. For the purpose of this thesis, student …

Selected Factors Related To The Mathematics Academic Achievement Of Eighth Grade English Language Learners, Anthony Garza

Theses and Dissertations - UTB/UTPA

The purpose of this study was to examine selected factors related to the 8th grade mathematics achievement levels of English Language Learner (ELL) students in selected South Texas middle schools. The dependent variable, ELL mathematics achievement, was measured by the ELL student’s raw score on the State of Texas Assessment of Academic Readiness (STAAR) or the State of Texas Assessment of Academic Readiness linguistically accommodated test (STAAR L). The factors examined in this study were 1) parent’s educational background, 2) socioeconomic status, 3) parental involvement status at school, 4) number of people in the household, 5) family structure, 6) primary …

Evidence Of Olfactory And Visual Learning In The Asian Citrus Psyllid, Diaphorina Citri Kuwayama (Hemiptera: Psyllidae), Dara G. Stockton

Theses and Dissertations - UTB/UTPA

Investigation of the mechanisms underlying learning and memory can be achieved through research on neurobiologically simplified invertebrate species. As such, insects have been used for decades as ideal models of olfactory learning. The current study aimed to investigate the mechanisms of chemosensory attraction in an invasive insect, Diaphorina citri, the Asian citrus psyllid (ACP), through manipulation of olfactory stimuli. After classical conditioning to a non-innate cue (vanilla extract), psyllids displayed enhanced feeding behavior. There was, however, an inverse relationship between olfactory “noise” and feeding behavior. Preliminary data suggests ACP may also be visual learners, as evidenced by trials attempting to …

De-Embedding In High Speed Design, Don Degroot, David Dunham

Faculty Publications

No abstract provided.

Inquiry-Based Science Education As Multiple Outcome Interdisciplinary Research And Learning (Moirl), Allan Feldman, Angela M. Chapman, Vanessa Vernaza-Hernández, Dilek Ozalp, Fayez Alshehri

Teaching and Learning Faculty Publications

The article provides the basis for a model of inquiry-based science education in which K-12 teachers’ and pupils’ engage in authentic science experiences as participants of a scientific research project, which we refer to as Multiple Outcome Interdisciplinary Research and Learning (MOIRL). We provide the basis for the model for inquiry based science education (IBSE) by first describing how the model came about through our 10 years of research on how people learn to do science in research groups. We then turn to the literature on the relationship among scientific inquiry, inquiry learning and MOIRL. As our case studies of …

Design Of A Pretreatment And Enzymatic Saccharification Scheme Of Understory From Managed Pine Forest For A Biochemical-Refinery Platform: The Example Of The Sweetgum Tree, Angele Djioleu

Graduate Theses and Dissertations

The possibility of using sweetgum from southern pine dominated forests as a biobased refinery feedstock was investigated. First, a baseline hydrolysis scheme for sweetgum wood and bark was designed. Sweetgum wood and bark were pretreated with 0.98% (v/v) sulfuric acid at 140°C for 30, 40, 50, 60 or 70 min and at 160°C for 30, 40, 50 or 60 min. The water insoluble solid (WIS) fraction was hydrolyzed with a cellulase enzyme cocktail. Results showed that maximum xylose and glucose yields from the wood were 82 and 86%, respectively. Similarly, the respective maximum yields of xylose and glucose from the …

A Watershed Scale Evaluation Of Selected Second Generation Biofeedstocks On Water Quality, Gurdeep Singh

Graduate Theses and Dissertations

This study compares a novel simulation approach to the conventional Soil and Water Assessment Tool (SWAT) modeler's approach for targeting biofuel crop production on marginal lands. In conventional SWAT modeling approach, non-spatial definition of hydrological response units (HRUs) results in the simulation of biofuel crops on both marginal and non-marginal land. This study provides an alternative approach in which a marginal-land raster was integrated into the land use and land cover (LULC) raster in such a way that the land uses were divided into marginal and non-marginal components. This modified LULC was used for model setup which resulted in marginal …

2012 December, Office Of Communications & Marketing, Morehead State University.

Morehead State Press Release Archive, 1961 to the Present

Press releases for December of 2012.

Swift Follow-Up Observations Of Candidate Gravitational-Wave Transient Events, P. A. Evans, J. K. Fridriksson, N. Gehrels, J. Homan, Matthew Benacquista, Teviet Creighton, Mario C. Diaz, Soma Mukherjee, Malik Rakhmanov, Joseph D. Romano

Physics & Astronomy Faculty Publications

We present the first multi-wavelength follow-up observations of two candidate gravitational-wave (GW) transient events recorded by LIGO and Virgo in their 2009-2010 science run. The events were selected with low latency by the network of GW detectors (within less than 10 minutes) and their candidate sky locations were observed by the Swift observatory (within 12 hr). Image transient detection was used to analyze the collected electromagnetic data, which were found to be consistent with background. Off-line analysis of the GW data alone has also established that the selected GW events show no evidence of an astrophysical origin; one of them …

Evaluation Of The Effects Of Absorption Field Product Architecture Type On Effluent Dispersal And Soil Chemical Properties In A Profile-Limited Soil, Nina J.M. Prater

Graduate Theses and Dissertations

On-site wastewater treatment systems (OWTSs) are commonly used by households in areas of low population density to treat household wastewater and recycle it back to the environment. The traditional absorption field product used in OWTSs is a pipe-and-gravel architecture type, which has been used for decades and is the basis for most design regulations. However, new products of differing architecture types including chambers, polystyrene-aggregate, pipe-and-tire-chip, and gravel-less-pipe systems have recently become available. A three-year field study was conducted in Bethel Heights, AR to assess the performance of several newer products and to compare different architecture types to the traditional pipe-and-gravel …

Plasmonic And Photonic Designs For Light Trapping In Thin Film Solar Cells, Liming Ji

Graduate Theses and Dissertations

Thin film solar cells are promising to realize cheap solar energy. Compared to conventional wafer cells, they can reduce the use of semiconductor material by 90%. The efficiency of thin film solar cells, however, is limited due to insufficient light absorption. Sufficient light absorption at the bandgap of semiconductor requires a light path more than 10x the thickness of the semiconductor. Advanced designs for light trapping are necessary for solar cells to absorb sufficient light within a limited volume of semiconductor. The goal is to convert the incident light into a trapped mode in the semiconductor layer.

In this dissertation, …

Assessing The Impacts Of Surface Water Removal For Use In Natural Gas Extraction On A Watershed Level, Carrie Ann Davis

Graduate Theses and Dissertations

In this study, the Soil and Water Assessment Test (SWAT) was used as a tool to predict whether diffuse water removal from the Cadron Creek watershed for use with natural gas development would have an impact on downstream flow within the watershed. Cadron Creek watershed expands across four counties within Arkansas and is located in the Fayetteville Shale Gas region. This region is experiencing significant growth in natural gas development. Successful development of shale gas depends on the identification of what water supplies are available for production without interfering with community and environmental needs. The SWAT model used to evaluate …

Inquiry-Based Instruction In The Social Studies: Successes And Challenges, Crystal Maree Beshears

Graduate Theses and Dissertations

The purpose of this study was to investigate teachers' perceptions, understanding, and use of inquiry-based instruction in the Social studies, to assess the impact of inquiry-based units on instruction, to detail implementation successes and challenges reported by teachers when implementing inquiry-based instruction, and to provide recommendations for future efforts. Teachers' perceptions of teaching and learning, particularly their beliefs about inquiry-based instruction, changed during the study. Throughout the study, teachers' perceptions and beliefs about teaching Social studies had an impact on how they planned, implemented and reflected on inquiry-based instruction. Many of the teachers changed their perceptions and began regularly teaching …

Topics On Light-Emitting-Diode Driver Research, Jaber Hasan

Graduate Theses and Dissertations

In this dissertation, light-emitting-diode (LED) drivers are investigated for efficiency issues related to driving Red-Green-Blue (RGB) pixels and multiple LED strings in parallel. A high-efficiency digitally controlled RGB LED driver was designed for driving a 3x3 RGB LED display panel. A multiplexer was used to sense the voltage drop across the current controllers. This driver maintained a minimum drive voltage across the RGB LED pixels required to keep it in regulation leading to a reduction of unwanted power losses in the RGB LED pixels by selecting the minimum drop across the current-controllers as the reference voltage of the digital controller. …

Glacial Shortcut Of Arctic Sea-Ice Transport, Michael Stärz, Xun Gong, Rüdiger Stein, Dennis A. Darby, Frank Kauker, Gerrit Lohmann

OES Faculty Publications

Due to the lack of data, the extent, thickness and drift patterns of sea ice and icebergs in the glacial Arctic remains poorly constrained. Earlier studies are contradictory proposing either a cessation of the marine cryosphere or an ice drift system operating like present-day. Here we examine the marine Arctic cryosphere during the Last Glacial Maximum (LGM) using a high-resolution, regional ocean-sea ice model. Whereas modern sea ice in the western Arctic Basin can circulate in the Beaufort Gyre for decades, our model studies present an extreme shortcut of glacial ice drift. In more detail, our results show a clockwise …

Scheduling Critical Activities Of Stochastic Projects Management, Alauldin Noori Ahmed, Natheir Abbas Ibrahim

Journal of Economics and Administrative Sciences

In this paper, we consider the problem of stochastic project network when some or all activities are interrupted. An approach has been built to schedule the critical activities, by constructing some expressions based on the project lateness costs due to the interruption activities. Two simple example are presented to validate our approach.

A Comparison Some Of Methods For Estimating Survival Function For Truncated Exponential Distribution, Jasim Hassan Lazim

Journal of Economics and Administrative Sciences

Exponential distribution is one of most common distributions in studies and scientific researches with wide application in the fields of reliability, engineering and in analyzing survival function therefore the researcher has carried on extended studies in the characteristics of this distribution. In this research, estimation of survival function for truncated exponential distribution in the maximum likelihood methods and Bayes first and second method, least square method and Jackknife dependent in the first place on the maximum likelihood method, then on Bayes first method then comparing then using simulation, thus to accomplish this task, different size samples have been adopted by …

Using Benford’S Law To Detect Financial Fraud, Nsaif Jasim ‎Aljbwry, Salah Hadi Mohammed Al-Khalidi

Journal of Economics and Administrative Sciences

Fraud Includes acts involving the exercise of deception by multiple parties inside and outside companies in order to obtain economic benefits against the harm to those companies, as they are to commit fraud upon the availability of three factors which represented by the existence of opportunities, motivation, and rationalization. Fraud detecting require necessity of indications the possibility of its existence. Here, Benford’s law can play an important role in direct the light towards the possibility of the existence of financial fraud in the accounting records of the company, which provides the required effort and time for detect fraud and prevent …

Knowledge-Driven Autonomous Commodity Trading Advisor, Yee Pin Lim, Shih-Fen Cheng

Research Collection School Of Computing and Information Systems

The myth that financial trading is an art has been mostly destroyed in the recent decade due to the proliferation of algorithmic trading. In equity markets, algorithmic trading has already bypass human traders in terms of traded volume. This trend seems to be irreversible, and other asset classes are also quickly becoming dominated by the machine traders. However, for asset that requires deeper understanding of physicality, like the trading of commodities, human traders still have significant edge over machines. The primary advantage of human traders in such market is the qualitative expert knowledge that requires traders to consider not just …

Cost-Sensitive Online Classification, Jialei Wang, Peilin Zhao, Steven C. H. Hoi

Research Collection School Of Computing and Information Systems

Both cost-sensitive classification and online learning have been extensively studied in data mining and machine learning communities, respectively. However, very limited study addresses an important intersecting problem, that is, “Cost-Sensitive Online Classification". In this paper, we formally study this problem, and propose a new framework for Cost-Sensitive Online Classification by directly optimizing cost-sensitive measures using online gradient descent techniques. Specifically, we propose two novel cost-sensitive online classification algorithms, which are designed to directly optimize two well-known cost-sensitive measures: (i) maximization of weighted sum of sensitivity and specificity, and (ii) minimization of weighted misclassification cost. We analyze the theoretical bounds of …

Community-Based Classification Of Noun Phrases In Twitter, Freddy Chong Tat Chua, William W. Cohen, Justin Betterridge, Ee-Peng Lim

Research Collection School Of Computing and Information Systems

Many event monitoring systems rely on counting known keywords in streaming text data to detect sudden spikes in frequency. But the dynamic and conversational nature of Twitter makes it hard to select known keywords for monitoring. Here we consider a method of automatically finding noun phrases (NPs) as keywords for event monitoring in Twitter. Finding NPs has two aspects, identifying the boundaries for the subsequence of words which represent the NP, and classifying the NP to a specific broad category such as politics, sports, etc. To classify an NP, we define the feature vector for the NP using not just …

Investigating Intelligent Agents In A 3d Virtual World, Yilin Kang, Fiona Fui-Hoon Nah, Ah-Hwee Tan

Research Collection School Of Computing and Information Systems

Web 3.0 involves " intelligent " web applications that utilize natural language processing, machine-based learning and reasoning, and intelligent techniques to analyze and understand user behavior. In this research, we empirically assess a specific form of Web 3.0 application in the form of intelligent agents that offer assistance to users in the virtual world. Using media naturalness theory, we hypothesize that the use of intelligent agents in the virtual world can enhance user experience by offering a more natural way of communication and assistance to users. We are interested to test if media naturalness theory holds in the context of …