Digital Commons Network^™

Abstraction, Extension And Structural Auditing With The Umls Semantic Network, Yan Chen

Dissertations

The Unified Medical Language System (UMLS) is a two-level biomedical terminological knowledge base, consisting of the Metathesaurus (META) and the Semantic Network (SN), which is an upper-level ontology of broad categories called semantic types (STs). The two levels are related via assignments of one or more STs to each concept of the META.

Although the SN provides a high-level abstraction for the META, it is not compact enough. Various metaschemas, which are compact higher-level abstraction networks of the SN, have been derived. A methodology is presented to evaluate and compare two given metaschemas, based on their structural properties. A consolidation …

Ontology Learning For The Semantic Deep Web, Yoo Jung An

Dissertations

Ontologies could play an important role in assisting users in their search for Web pages. This dissertation considers the problem of constructing natural ontologies that support users in their Web search efforts and increase the number of relevant Web pages that are returned. To achieve this goal, this thesis suggests combining the Deep Web information, which consists of dynamically generated Web pages and cannot be indexed by the existing automated Web crawlers, with ontologies, resulting in the Semantic Deep Web. The Deep Web information is exploited in three different ways: extracting attributes from the Deep Web data sources automatically, generating …

Mechanisms Of Ionic Current Changes Underlying Rhythmic Activity Recovery After Decentralization, Olga E. Khorkova Sherman

Dissertations

Neuronal networks capableof generating rhythmic output in the absence of patterned sensory or central inputs are widely represented in the nervous system where they support a variety of functions, from learning and memory to rhythmic motor activity such as breathing. To perfectly function in a living organism, rhythm-generating networks have to combine the capability of producing a stable output with the plasticity needed to adapt to the changing demands of the organism and environment. This dissertation used the pyloric network of the crab Cancer borealis to identify potential mechanisms that ensure stability and adaptation of rhythm generation by neuronal networks …

The Development And Evaluation Of Software To Foster Professional Development In Educational Assessment, Morgan C. Benton

Dissertations

This dissertation sought to answer the question: Is it possible to build a software tool that will allow teachers to write better multiple-choice questions? The thesis proceeded from the finding that the quality of teaching is very influential in the amount that students learn. A basic premise of this research, then, is that improving teachers will improve learning. With this foundation, the next question became what area of teaching to improve. The literature on educational assessment indicated that teachers lack competence at effective assessment, particularly in the area of multiple-choice question generation. It is likely that improvement in this area …

Multiclass Intermodal Network Model : The Use Of Combined Model On System Evaluations, Yi Deng

Dissertations

United States transportation policy has generally addressed the negative economic and social effects of the standpoint of individual transportation modes and local government involvement. Therefore, there has been an increased focus on the development of intermodal transportation. Integrating the modes and using each of them to its best advantage are strategies to optimize the existing resources and to create new capabilities.

According to the literature review performed in this research, the research in intermodal transportation system evaluation is far from mature. Most transportation performance measurements are focused on one mode rather than a whole network. In practice, the data necessary …

Propagation And Scattering Of Beam Waves In Vegetation Using Scalar Transport Theory, Michael Yu-Chi Wu

Dissertations

Vegetation is a very complex propagation medium, and multiple scattering effects play a significant role in the propagation of microwave and millimeter (mm)-wave signals through foliage. At frequencies above 1 GHz,both the coherent and incoherent field components have to be taken into account and vegetation has to be modeled as a random medium of discrete scatterers having a wide variety of sizes and shapes. Multiscattering can be studied effectively by using transport theory. In prior studies, theories have been developed for microwave and mm-wave propagation in vegetation using transport theory for continuous wave and pulsed signals. In this study, the …

Some Combinational Optimization Problems On Radio Network Communication And Machine Scheduling, Xin Wang

Dissertations

The combinatorial optimization problems coming from two areas are studied in this dissertation: network communication and machine scheduling.

In the network communication area, the complexity of distributed broadcasting and distributed gossiping is studied in the setting of random networks. Two different models are considered: one is random geometric networks, the main model used to study properties of sensor and ad-hoc networks, where ri points are randomly placed in a unit square and two points are connected by an edge if they are at most a certain fixed distance r from each other. The other model is the so-called line-of-sight networks, …

User Evaluation Of The Performance Of Information Systems, Edward Mahinda

Dissertations

Information technologies (IT) are considered the primary survival factor for many organizations and the most critical success factor in businesses today. To justify the necessary investment in IT, user evaluation of information systems' performance in organizations is a key consideration. This research investigated a comprehensive and convenient means for end users to assess this performance.

Among the existing theories and models on the evaluation of information system performance based on intrinsic technological properties, the Web of System Performance (WOSP) model provides the most comprehensive basis for information system evaluation, and therefore merited further investigation. The research question was how well …

Complex Adaptive Systems Based Data Integration : Theory And Applications, Eliahu Rohn

Dissertations

Data Definition Languages (DDLs) have been created and used to represent data in programming languages and in database dictionaries. This representation includes descriptions in the form of data fields and relations in the form of a hierarchy, with the common exception of relational databases where relations are flat. Network computing created an environment that enables relatively easy and inexpensive exchange of data. What followed was the creation of new DDLs claiming better support for automatic data integration. It is uncertain from the literature if any real progress has been made toward achieving an ideal state or limit condition of automatic …

Leader Delegation And Trust In Global Software Teams, Suling Zhang

Dissertations

Virtual teams are an important work structure in global software development. The distributed team structure enables access to a diverse set of expertise which is often not available in one location, to a cheaper labor force, and to a potentially accelerated development process that uses a twenty-four hour work structure.

Many software teams are partially distributed, that is, part of the team is colocated. Such partially distributed global software teams are an important work structure in software development projects. However, little is known about what affects or improves team members’ motivation and job satisfaction in the partially distributed environment. This …

Optimized Scheduling Of Highway Work Zones, Yimin Tang

Dissertations

Highway maintenance activities usually require lane closures and disrupt traffic operations. Because of budget constraints, project deadlines, and the resulting traffic impact, the objective of this dissertation is to improve the efficiencies of traffic operation and maintenance work, and minimize the total project cost (i.e., agency cost and road user cost) by optimizing work zone schedules.

This dissertation focuses on the maintenance projects on multiple-lane highways. The objective total cost function is formulated while considering a discrete maintenance time-cost function and time-dependent traffic diversions. However, the work zone scheduling problem is a combinatorial optimization problem and difficult to solve analytically. …

Automatic Prediction Of Solar Flares And Super Geomagnetic Storms, Hui Song

Dissertations

Space weather is the response of our space environment to the constantly changing Sun. As the new technology advances, mankind has become more and more dependent on space system, satellite-based services. A geomagnetic storm, a disturbance in Earth's magnetosphere, may produce many harmful effects on Earth. Solar flares and Coronal Mass Ejections (CMEs) are believed to be the major causes of geomagnetic storms. Thus, establishing a real time forecasting method for them is very important in space weather study.

The topics covered in this dissertation are: the relationship between magnetic gradient and magnetic shear of solar active regions; the relationship …

Taux : A System For Evaluating Sound Feedback In Navigational Tasks, Robert J. Lutz

Dissertations

This thesis presents the design and development of an evaluation system for generating audio displays that provide feedback to persons performing navigation tasks. It first develops the need for such a system by describing existing wayfinding solutions, investigating new electronic location-based methods that have the potential of changing these solutions and examining research conducted on relevant audio information representation techniques. An evaluation system that supports the manipulation of two basic classes of audio display is then described. Based on prior work on wayfinding with audio display, research questions are developed that investigate the viability of different audio displays. These are …

Academic Performance As A Predictor Of Student Growth In Achievement And Mental Motivation During An Engineering Design Challenge In Engineering And Technology Education, Nathan James Mentzer

Dissertations

The purpose of this correlational research study was to determine if students’ academic success was correlated with: (a) the student change in achievement during an engineering design challenge; and (b) student change in mental motivation toward solving problems and critical thinking during an engineering design challenge. Multiple experimental studies have shown engineering design challenges increase student achievement and attitude toward learning, but conflicting evidence surrounded the impact on higher and lower academically achieving students.

A high school classroom was chosen in which elements of engineering design were purposefully taught. Eleventh-grade student participants represented a diverse set of academic backgrounds (measured …

Perceptions Of Creativity In Art, Music And Technology Education, David Russell Stricker

Dissertations

This study was conducted to examine the perceptions of art, music, and technology education teachers with regard to creativity in their respective fields. The survey used in this study was designed around the themes borne out of creativity literature generally and creativity specific to the fields of art, music, and technology and engineering education. As a result the themes of creative process, products, personal traits, and environment shaped the items contained in the survey.

Although participants from all three subjects perceived the creative process as important to creative work generally, technology education teachers were less interested in the importance of …

Engineering-Oriented Professional Development For Secondary Level Teachers: A Multiple Case Study Analysis, Jenny Lynn Daugherty

Dissertations

This study consisted of multiple case studies of selected professional development programs designed to prepare secondary teachers to deliver engineering-oriented education. The focus was on understanding the professional development design, fundamental content knowledge, essential pedagogies, unique challenges, and effective practices involved in this type of professional development. This was achieved by interviewing the leadership, instructors, and participating teachers; observing the in-person workshops; administering a survey to the teachers; and analyzing the project’s documentation. Five professional development programs were examined, including: Engineering the Future, Project Lead the Way, Mathematics Across the Middle School MST Curriculum, The Infinity Project, and INSPIRES. The …

Examination Of Engineering Design In Curriculum Content And Assessment Practices Of Secondary Technology Education, Todd R. Kelley

Dissertations

This descriptive study examined the current status of technology education teacher practices with respect to engineering design. Participants were drawn from the current International Technology Education Association (ITEA) high school teacher membership database. A survey instrument gathered data about the extent to which engineering design concepts are incorporated into the curriculum content, and assessment practices employed by secondary technology educators. Moreover, the survey identified challenges faced by technology educators when seeking to implement engineering design. Current curriculum content that addresses engineering design concepts consisted of the following seven subsets: (a) engineering design, (b) engineering analysis, (c) application of engineering design, …

Complex Systems In Engineering And Technology Education: A Mixed Methods Study Investigating The Role Computer Simulations Serve In Student Learning, Douglas James Walrath

Dissertations

This research was conducted to determine if students receiving complex systems instruction in the form of software simulations recognize patterns and underlying elements of complex systems more effectively than students receiving traditional instruction. Complex systems were investigated with an analytic (reductive) approach in a control group and with a synthesis approach in the treatment group. Exploration of this top-down approach to learning complex systems counters traditional bottom-up methodologies, investigating systems and subsystems at the component level. The hypothesis was that students experiencing complex systems scenarios in a computerbased learning environment would outperform their counterparts by constructing a greater number of …

Perceptions Of Technology Use In Rural And Urban Pennsylvania High Schools, Brenda M. Freeman

Dissertations

Purpose

Policy makers are implementing standards and developing guidelines for integrating technology into K-12 schools. With this in mind, the integration of technology into curriculum is an ever-growing point of discussion among high-school education professionals. Technology uses in teaching and learning present significant issues in educational reform literature. Rather than trying to describe the impact of all technologies as if they were the same, this study focuses on the differences in the ways technologies are being used in the classroom as well as the role technology played in instruction. There is also a need to investigate whether or not student …

A Mixed-Method Study Of The Environmental And Personal Factors That Influence Faculty Research Productivity At Small-Medium, Private, Doctorate-Granting Universities, Gustavo Gregorutti

Dissertations

Problem. This study sought to determine what organizational factors and personal characteristics of faculty members most relate to research productivity at small- to medium-sized not-for-profit, private, doctorate-granting universities.

Method. A mixed methodology was used that included an online survey, follow-up email surveys, and two face-to-face interviews. The main statistical tools used were multivariate analysis of variance (MANOVA) and regression. The final sample came from 12 small- to medium-size, private, not-for-profit doctorate-granting American universities. A group of 277 professors responded to the online survey. An online follow-up qualitative survey was conducted with 34 replies. Two additional face-to-face interviews were …

The Book Of Daniel In Light Of The Ancient Near Eastern Literary And Material Finds: An Archaeological Perspective, Patrick Mazani

Dissertations

This dissertation examines the text of the book of Daniel in light of some ancient Near Eastern archaeological discoveries. While chapter 1 of this research is introductory, chapter 2 begins by investigating personal and place names mentioned in Daniel and making a comparative analysis between the claims of Daniel's text and related archaeological discoveries. Archaeological evidence shows that the place names mentioned in the book of Daniel were real geographical locations where historical events are claimed to have taken place. Archeological materials not only help clarify some words, phrases, and locations of places, but seem to show that at least …

A Knowledge Management Initiative In A Juvenile Detention School, Noel Sweeney

Dissertations

The preservation of knowledge has been a human endeavour since the dawn of time. Using whatever resources possible, humans have recorded knowledge for the purpose of bequeathing it to the next generations. With each technological advance, it would appear that the resources available for recording knowledge have improved. Not only this, but with each advance, the accessibility and availability to this knowledge has been enhanced; and in our present times, the impact of technology has made it easier than ever before. As with education, the consequence of making knowledge more available and accessible is the creation of more knowledgeable individuals …

Mixed Oxidizer Hybrid Propulsion System Optimization Under Uncertainty Using Applied Response Surface Methodology And Monte Carlo Simulation, James Joshua Whitehead

Dissertations

No abstract provided.

A Five Year Comparison Between An Extended Year School And A Conventional Year School: Effects On Academic Achievement, Vanessa Khankeo Vandergraaf

Dissertations

The purpose of this study was to compare the academic achievement of third grade students in an extended year school to that of third grade students in a conventional school. The problem statement was that both schools were academically deficient according to the requirements of the No Child Left Behind (NCLB) Act. The comparison between the two schools used communication arts and science data from 2002-2006 Missouri Assessment Program (MAP). It also examined the effects of variables such as summer breaks, socioeconomic status, and student attendance that affect student achievement beyond adding more instructional time. Examination of research related to …

Career Concerns, Pathing, And Professional Development Of High-School Technology Educators, Linda A. Tolan

Dissertations

No abstract provided.

An Examination Of Principal Leadership Practices And School-Level Variables In Connecticut Schools With Achievement Gains Above And Below The State's Average Performance Gain On State Assessments, David R. Cormier

Dissertations

Problem

Effective-schools research has demonstrated that a building level administrator’s leadership practices contribute to the success or failure of change efforts and impact school culture and student achievement. Research in this area has focused primarily on comparing high and low performing schools and the various antecedent/context variables of such schools. This study examined schools with annual achievement gains above and below the state’s average gain in student performance and sought to determine if there were significant differences in school antecedent/context variables, leadership practices, and mediating variables between these schools.

Method

Research participants represented a sample of Connecticut elementary schools with …

The Relationship Between Collective-Efficacy And Student Achievement In Vocational/Technical High Schools, Rosemary Tralli

Dissertations

Purpose

The impact of teachers’ efficacious beliefs on achievement in technical high schools required further investigation. This study examined the collective-efficacy beliefs of academic and trade departments in 17 Connecticut technical high schools and the relationship between those beliefs and student achievement.

Method

The collective-efficacy beliefs of 730 teachers were measured through use of the Collective Teacher-Efficacy Belief Scale. Perceptions of influence over instruction, discipline, and overall efficacy were obtained. A sample of 2,592 students was used to obtain achievement data in mathematics, science, reading, and writing on the Connecticut Academic Performance Test. Multiple regression analysis was used to determine …

Teacher Perceptions Of Their Effectiveness In Supporting Reading Strategies As A Result Of Collaboration With A Literacy Coach, Sharon S. Miller

Dissertations

Problem

The poor reading and comprehension skills of many secondary-school students present a challenge for secondary teachers, the majority of whom have no training in the teaching of reading. The increasing expectations of the No Child Left Behind legislature add to the pressures on public educators. Is coaching an effective way to support and encourage secondary content-area teachers to include reading strategies in their daily work with students?

Purpose

The purpose of the study was to examine the literacy coach initiative in two small junior-senior high schools. A further purpose was to closely study the coach and two of the …

Knowledge Visualisation Of Wikipedia, Jinhui Wang

Dissertations

Wikipedia is a popular online encyclopaedia, in which articles are created together by anyone who is willing to contribute. There is debate on the quality, reliability and consistency of articles due to its openness. Besides, it is hard to see the growing path of articles because there is no centralised control in Wikipedia. The history of articles is available but in form that is difficult to process to get a picture of article evolution. Knowledge visualisation addresses the problem by providing analysis and comprehension of large amounts of data to gain insights and to facilitate knowledge creation and sharing. However, …

Electron Beam Characterization Of Carbon Nanostructures, Eric Samuel Mandell

Dissertations

Atom-thick carbon nanostructures represent a class of novel materials that are of interest to those studying carbon's role in fossil fuel, hydrogen storage, scaled-down electronics, and other nanotechnology. Electron microscope images of "edge-on" graphene sheets show linear image features due to the projected potential of the sheets. Here, intensity profiles along these linear features can measure the curvature of the sheet, as well as the shape of the sheet (i.e. hexagonal, triangular). Also, electron diffraction powder profiles calculated for triangular graphene sheet shapes show a broadening of the low-frequency edge of diffraction rings, in comparison to those calculated for hexagonal …