Digital Commons Network^™

Hybrid Explicit-Implicit Fdtd-Fem Time-Domain Solver For Electromagnetic Problems, Kakhkhor Abdijalilov

Dissertations

The Finite-Difference Time-Domain (FDTD) method and Finite-Element (FEM) method are numerical techniques used for solving Maxwell's electromagnetic equations. FDTD-FEM hybrid methods opt for combining the advantages of both FDTD and FEM. In this dissertation, signal processing techniques were used to analyze the FDTD stability condition. A procedure, which reduces time-sampling error yet preserves the stability of algorithm is proposed. Both explicit and implicit time-stepping schemes were treated in the framework of the developed method. An improved version of the implicit-explicit FEM-FDTD hybrid method was developed. The new method minimizes reflection from the interface between different types of grids. A class …

Turbo Space-Time Coding For Mimo Systems : Designs And Analyses, Hangjun Chen

Dissertations

Multiple input multiple output (MIMO) systems can provide high diversity, high data rate or a mix of both, for wireless communications. This dissertation combines both modes and suggests analyses and techniques that advance the state of the art of MIMO systems. Specifically, this dissertation studies turbo space-time coding schemes for MIMO systems.

Before the designs of turbo space-time codes are presented, a fundamental tool to analyze and design turbo coding schemes, the extrinsic information transfer (EXIT) chart method, is extended from the binary/nonbinary code case to coded modulation case. This extension prepares the convergence analysis for turbo space-time code.

Turbo …

Behavior Of Structural Concrete Members Strengthened By Composite Fabrics, Jian Chen

Dissertations

The new technique of using Fiber Reinforced Polymer (FRP) materials to repair and strengthen various concrete members is becoming more and more popular in structural retrofitting field. Among all the confining materials, Carbon Fiber Reinforced Polymer (CFRP) fabric jackets are identified as an effective way to enhance the strength and ductility of concrete members due to its superior mechanical properties. This study investigates the detailed structural behavior of confined concrete members using CFRP fabric jackets by both analytical and experimental approaches.

A series of CFRP wrapped concrete cylinder tests were conducted to study the compressive stress-strain behavior for CFRP confined …

Detection Of Network Anomalies And Novel Attacks In The Internet Via Statistical Network Traffic Separation And Normality Prediction, Jun Jiang

Dissertations

With the advent and the explosive growth of the global Internet and the electronic commerce environment, adaptive/automatic network and service anomaly detection is fast gaining critical research and practical importance. If the next generation of network technology is to operate beyond the levels of current networks, it will require a set of well-designed tools for its management that will provide the capability of dynamically and reliably identifying network anomalies. Early detection of network anomalies and performance degradations is a key to rapid fault recovery and robust networking, and has been receiving increasing attention lately.

In this dissertation we present a …

Corrosion Studies On Alpha Tantalum And Beta Tantalum Coated Steel, Sung Min Maeng

Dissertations

Tantalum coating by sputtering, one form of physical vapor deposition (PVD), has been investigated as a replacement for chromium coatings on gun bores to protect them from erosion and corrosion due to its high ductility and high corrosion resistance in aggressive environments. When deposited as a film on steel substrates by sputtering, either α-Ta, β-Ta, or a mixture of both phases have been observed under varying deposition conditions. To evaluate corrosion behavior of Ta coatings, electrochemical impedance spectroscopy and potentiodynamic polarization were conducted as a function of coating thickness. The coating porosity was observed to decrease with increasing coating thickness …

Image Data Hiding, Zhicheng Ni

Dissertations

Image data hiding represents a class of processes used to embed data into cover images.

Robustness is one of the basic requirements for image data hiding. In the first part of this dissertation, 2D and 3D interleaving techniques associated with error-correction-code (ECC) are proposed to significantly improve the robustness of hidden data against burst errors.

In most cases, the cover image cannot be inverted back to the original image after the hidden data are retrieved. In this dissertation, one novel reversible (lossless) data hiding technique is then introduced. This technique is based on the histogram modification, which can embed a …

Live, Virtual, And Constructive Environments For Performance Support, John Michael Lacontora

Dissertations

As military systems become more complex, the operation and support of these systems becomes intrinsically more difficult. The U.S. Army's current procurement process relies on industry to provide embedded training and performance support tools for the systems they produce. These tools are relatively new and in the early stages of development. As yet, they have failed to meet the needs of the technicians that are required to support these complex systems. Current efforts to provide enabling technologies that enhance the capabilities of automotive maintenance technicians are concentrated in three professional communities. First is the Performance Improvement community where work is …

Pattern Discovery In Structural Databases With Applications To Bioinformatics, Sen Zhang

Dissertations

Frequent structure mining (FSM) aims to discover and extract patterns frequently occurring in structural data such as trees and graphs. FSM finds many applications in bioinformatics, XML processing, Web log analysis, and so on. In this thesis, two new FSM techniques are proposed for finding patterns in unordered labeled trees. Such trees can be used to model evolutionary histories of different species, among others.

The first FSM technique finds cousin pairs in the trees. A cousin pair is a pair of nodes sharing the same parent, the same grandparent, or the same great-grandparent, etc. Given a tree T, our …

Tide-Influenced Contaminant Transport In Coastal Aquifers, Yong Peng

Dissertations

Coastal aquifers are distinguished from other aquifers because of tidal effects which cause complicated groundwater flow and contaminant transport phenomena in regions immediately adjacent to the coast. This study is designed to address the significance of tidal influence on contaminant transport by focusing on one-dimensional homogeneous coastal aquifers.

This study formulates a conceptual model and corresponding flow and transport equations, analyzes coastal boundary conditions, solves numerically the transport equation, and uses experiments to verify the numerical results.

Results of numerical and experimental studies conclude that tides can have a significant impact on contaminant transport, especially when under unconfined conditions, subject …

Investigation Of Static And Dynamic Enhancement Of Laminar Natural Convection Cooling Of Electronics, Laurie Ann Florio

Dissertations

With the proliferation of consumer electronics devices and the increasingly demanding thermal control requirements for such devices, more effective and efficient means of cooling electronics are needed. The feasibility of three alternative approaches to enhancing pure natural convection cooling of electronics is investigated in the current research. The three static or dynamic methods investigated are alternate cross-flow passages, the strategic placement of transversely oscillating plates near the heat sources and a combined method using both the cross-flow passages and the strategically placed oscillating plates. These cooling methods are intended to operate in the regime for which natural convection cooling is …

In Vitro Drug Delivery Based On A Porous Membrane-Based Aqueous-Organic Partitioning System And Its Enhancements Through Mouse Skin, Qiuxi Fan

Dissertations

Novel approaches for transdermal drug delivery (TDD) based on a porous membrane-based aqueous-organic partitioning system have been investigated and successful deliveries were observed. Doxycycline hydrochloride (HCl), a polar antibiotic drug with a relatively large molecule weight (MW: 480.1) was studied as a basic model agent. Its controlled release using this technique was studied first. Satisfactory release profiles demonstrate the practical potential of such a system to achieve useful controlled release rates. The enhancer linoleic acid was essential to successful release using a mouse skin beneath a porous polymeric membrane. The transport rates of smaller molecules e.g., caffeine and nicotine from …

Qos Constrained Cellular Ad Hoc Augmented Networks, Chi-Tung Chen

Dissertations

In this dissertation, based on different design criteria, three novel quality of service (QoS) constrained cellular ad hoc augmented network (CAHAN) architectures are proposed for next generation wireless networks. The CAHAN architectures have a hybrid architecture, in which each MT of CDMA cellular networks has ad hoc communication capability. The CAHAN architectures are an evolutionary approach to conventional cellular networks. The proposed architectures have good system scalability and high system reliability.

The first proposed architecture is the QoS constrained minimum-power cellular ad hoc augmented network architecture (QCMP CAHAN). The QCMP CAHAN can find the optimal minimum-power routes under the QoS …

The Transition From High School To College : A Single-Case Study, Margaret R. Hay

Dissertations

Purpose. The purpose of this study was to use quantitative and qualitative data to describe the transition recent high-school graduates made to a small, rural community college. Both the students’ academic preparation and their own perceptions about their preparedness for college were described.

Method. Data from the transcripts of high-school graduates were examined using Chi square, tests of independent means, and analyses of variance to test the relationship to placement in developmental classes. The data included senior year course selections, the number of units taken in math, English, and textbook-dependent courses, and grade point averages in math, English, and textbook-dependent …

Developmental Processes Critical To The Formation Of Servant Leaders In China, Thomas William Horn

Dissertations

Problem. This study concerns three matters: the leader formation process in general, servant leadership formation in particular, and the application to crossing cultures, with China as the primary context. The central problem of this study revolves around leader formation . What events, experiences, people and other formative processes contributed as critical to the formation of exemplary Christian leaders in China?

Method. The design of this research was a narrative, qualitative study that explored the central phenomenon of leader formation. The researcher was the instrument to collect data through in-depth interviews. This study purposefully selected three exemplary Christian Chinese leaders. The …

Demographic Characteristics And Academic Measures As Predictors Of Success On The American Society For Clinical Pathology (Ascp) Medical Technologist Certification Examination, Marcia Ann Kilsby

Dissertations

Purpose. This study was undertaken to address the utility of demographic characteristics and academic measures as predictors of success for the American Society for Clinical Pathology Board of Registry Medical Technologist Certification Examination (Certification Examination) Total Score and six Subscores and to find predictive models with relevance to an ethnically and racially-diverse student population.

Method. The research population was the graduates of the Andrews University Program for Clinical Laboratory Sciences. The 233 subjects were from 53 different birth countries. The relationships between Certification Examination scores and both demographic characteristics and academic measures were analyzed by chi square, analysis o f …

Intuitive Decision Making And Leadership Style Among Healthcare Executives In The United States, Cherie Whiting

Dissertations

The purpose of this two-phased, sequential, exploratory, mixed-methods study was to survey a sample of Fellows in the American College of Healthcare Executives in the United States and then interview selected individuals who scored in the highly intuitive category on the intuition survey to explore how they made intuitive decisions. In the first phase, quantitative research questions addressed the relationship between leadership style and the potential to make intuitive decisions, as well as the relationship and interaction between the potential to make intuitive decisions and age, gender, and size of company. In the second phase, qualitative interviews were used to …

The Effect Of Embedded Metacognitive Prompts And Probes On Students’ Awareness In A Multimedia Lesson For Elementary School Students, Wendy Janine Parcel Edd

Dissertations

In a study he called The Effect of Embedded Metacognitive Cues and Probes on Use of Learner Control Features in an On-line Lesson for Elementary Students, Watson (2001) found that minimal prompting by an online tutorial increased 5th grade students’ comprehension of how much they understood. While Watson’s findings demonstrated a significant difference in the ability of prompted and non-prompted students to accurately predict their own performance on posttests, actual scores were not greater than those of control students until the results were analyzed by gender. The purpose of this study was to replicate and extend Watson’s study to determine …

Aims Of Education In The Writings Of Ellen White, Erling Bernhard Snorrason

Dissertations

Problem. Ellen White’s educational philosophy and its application to the aims of education have not been systematically or thoroughly addressed within the parameters and demands of a graduate thesis. The present dissertation explores the aims of education, especially the ultimate aims of education, in the writings of Ellen G. White, one of the founders of the Seventh-day Adventist Church, and could be of value in assessing the present Seventh-day Adventist educational enterprise.

Method. This dissertation is a description and an analysis of Ellen White’s concept of education as revealed by her understanding of the aims of education. It is a …

Revelation And Creation In The Thought Of Bernard L. Ramm And Carl F.H. Henry: The Creation "Days" As A Case Study, Warren H. Johns

Dissertations

This study explores the relationship between the doctrines of creation and revelation within evangelical thought, especially focusing upon the writings of the two foremost leaders of "Neo-evangelicalism," Bernard L. Ramm and Carl F. H. Henry. Neo-evangelicalism arose in America in the 1940s as a reaction against the Fundamentalism of the first decades of the twentieth century. One of its purposes was to free evangelicalism from the anti-intellectual tendencies of Fundamentalism while yet maintaining a belief in the full inspiration and historicity of Scripture. As a result, evangelicals have sought to harmonize the biblical record of creation with modern geological discoveries. …

Proclamation In Cross-Cultural Context: Missiological Implications Of The Book Of Daniel, Sung Ik Kim

Dissertations

This study attempts to explore the biblical foundation ofsalvific mission as revealed in God's purposes for the nations (missio Dei ) in the book of Daniel and to investigate the means that Daniel employed in his ministry as an overt missionary who was sent to witness to God's salvific purpose in the cross-cultural context of heathen kingdoms.

The main objective of this research is to validate the book of Daniel as a missionary document and show that its missiological implications are still relevant to present-day missions. Chapter 2 explores the salvific purpose of missio Dei in the book of …

Spiritual Well-Being And Quality Of Life As Correlates Of Job Stress Among Academic Chairpersons In Selected Seventh-Day Adventist Tertiary Institutions, Russell Mark Aldridge

Dissertations

Problem . Stress, like pain, begins at birth and remains common to the human condition throughout life, and it is a factor in the experience of every human being who ever lived. It is not merely universal but it is also endemic and omnipresent. Chairpersons, due to the bi-directional demands of administration and students are in a stressful environment. This study was undertaken to identify whether quality of life and spiritual well-being play an important role in occupational stress levels in chairpersons of Seventh-day Adventist Tertiary Institutions.

Method. Three questionnaires were used to get responses from 137 chairpersons in …

Job Satisfaction And Its Relationship To Organizational And Religious Commitment Among Workers At Northern Caribbean University, Donna Brown

Dissertations

Problem. Recruiting teachers and motivating them to stay in their jobs present a challenge to educational institutions in Jamaica. Given the importance of workers' satisfaction to the health of an organization and the link between job satisfactionand turnover rate, then an examination of job satisfaction at Northern Caribbean University (NCU) is a priority. Based on this background, the primary focus of this study was to investigate job satisfaction and its relationship to organizational and religious commitment among workers at NCU.

Method. This study utilized a quantitative, descriptive research design. A survey questionnaire was sent to all full-time administrators …

Evaluating Progress In Behavioral Programs For Children With Pervasive Developmental Disorders: Continuous Versus Intermittent Data Collection, Anne Rena Cummings

Dissertations

It is well documented that intensive behavioral treatment of early childhood autism can result in significant improvements in adaptive behavior. The typical teaching format in such programs is based on the restricted operant (i.e., discrete trial) in which the performance of an exemplar skill follows a clear instruction and precedes programmed reinforcement or error correction. Because of the often-intensive nature of behavioral treatment, it is not unusual for thousands of learning opportunities to be presented each week. There currently exists a professional debate regarding the frequency of data collection necessary in autism treatment programs. One side of the argument favors …

Origin Of The Central Kalamazoo River Valley, Southwestern Michigan, Usa, Andrew Kozlowski

Dissertations

Chapter I

Introduction

Southern Michigan's geomorphology is a testament to the glacial processes that buried and sculpted the landscape during the last glaciation. Many glacial landforms in southwestern Michigan, including the Kalamazoo River Valley, provide evidence that aids in understanding the chronology, ice dynamics and glacial processes that occurred in Michigan during the last ice age.

As the climate began to warm about 20,000 yr B.P. (Larson and Schaetzl, 2001) the extensive Laurentide Ice Sheet began to recede from its maximum southern position reached during the Late Wisconsinan (Figure 1). It was at this point that modem surficial drainage systems …

Interferences In Electron Emission Spectra For H+ Impact On H2, Sabbir Hossain

Dissertations

No abstract provided.

Management Style, Organizational Climate, And Organizational Performance In A Public Mental Health Agency: An Integral Model, Pamela Sue Meserve Erbisch

Dissertations

No abstract provided.

Effect Of Coating Additives On The Rheological And Optical Properties Of Coated Papers, Burak Aksoy

Dissertations

Although additives are used in small amounts (below 2wt.% of the total solids) in a coating formulation, they play an important role in the runnability and end-use performance of the coating. Among coating additives, the use of insolubilizers and fluorescent whitening agents (FWA's) has increased due to theincrease in demand for higher quality graphic papers and packaging. Zirconium containing insolubilizers were studied for their rheological effects on silica ink jet coatings. Both zirconium species had an influence on the theological properties of the coating and its components. The interactions between thezirconium salts and the coating were found to be weak …

Assessing The Differential Outcomes Procedure With Children Diagnosed With Autism, Ivy M. Chong

Dissertations

The differential outcomes effect (DOE) refers to the phenomenon whereby discrimination learning is enhanced when a correct response to a specific sample stimulus is followed by its own unique reward (Savage, 2001). According to some researchers, the DOE is a consistent and powerful effect that enhances the acquisition and retention of conditional discriminations (e.g., Urcuioli, 1990). This series of experiments sought to extend research on the DOE. In Experiment 1, we examined the differential outcomes procedure (DOP) with four children diagnosed with autism across various task types commonly used in early intervention. In Experiment 2, we examined the DOP with …

A Multicomponent Intervention System Using Goal Setting, Feedback, And Incentives To Improve Performance In Small Service Businesses, Doug Lafleur

Dissertations

A small business servicing dealerships in the chimney lining industry was responsible for training and resupplying contractors in a propriety chimney lining system. A process was developed for sharing and comparing the dealerships' financial reports and business processes. The process involved a small group of dealers attending regular 6-month meetings called Impact Groups. A monetary incentive system was used to encourage dealers to join the Impact Groups and to maintain continued attendance and participation. Dealers took turns hosting the meetings and having the attending dealers analyze their business. A detailed list of problems and solutions was provided to each host …

Effectiveness Of Teaching Modalities For Pre-College Level Mathematics Courses, Dorothy Latuszek

Dissertations

College educators are challenged with providing students with choices of teaching modalities that facilitate student achievement and success at a time when students are also seeking flexible scheduling and accommodation of their differing learning styles. This is certainly the case for college students who need to demonstrate proficiency for the content in pre-college level mathematics courses prior to enrolling in college-level mathematics courses. The term "pre-college level" is defined as courses in reading, writing, and mathematics for college students lacking those skills necessary to perform college-levelcoursework at two- or four-year college institutions (Parsad & Lewis, 2003).

Do certain teaching modalities …