Digital Commons Network^™

Official Discourse And Public Opinion In Post-Communist Societies: The Role Of Government-Affiliated Intellectuals, Ekaterina M. Levintova

Dissertations

Post-Communist countries are unique in the sense that they are undergoing not a single, but multiple transitions. The extent of social change underway inthis region is truly monumental and researchers are faced with the daunting task of studying the extent of this transformation. Change is most evident when one studies formal institutions. But lies beneath, on the level of value orientations? The answer to this question helps us understand the real progress of post-Communist countries towards the goals of their transitions.

What were the political, ideological, economic, foreign policy, and ethnic relations attitudes of the post-Communist Russian and Polish elites …

Girls And Science: A Qualitative Study On Factors Related To Success And Failure In Science, Paula Denise Johnson

Dissertations

This qualitative study sought to determine how girls perceived factors that contribute to their success in science programs designed to maximize their achievement. The sample consisted of 20 students in 9th and 12th grades attending a school of choice. Respondents were interviewed using a structured interview protocol.

The National Council for Research on Women study (Thom, 2001) found that girls are more successful in math and science programs that incorporate acooperative, hands-on approach than in programs that stress competition and individual learning. This finding was supported by this study among 20 high school girls in a school whose mission is …

Inelastic X-Ray Scattering Studies In Lithium And Metal Ammonia Solutions, Ayman Hasan Said

Dissertations

In this work, inelastic x-ray scattering was used to measure the ionic collective excitations of a metal-ammonia system and the atomic form factor of lithium in a single crystal. For lithium and sodium ammonia systems, the measurements were carried out for different metal concentrations (lithium-ammonia with 2 0 , 16, and 13 mole percent metal [MPM] at T'=240K and sodium-ammonia with 18, 14, and 10 MPM at T=222K). These data were analyzed to determine the acoustic collective excitation dispersion relation and the linewidth. Deviations from the Bohm-Staver model for electron-ion coupling are discussed for the low electronic densities. For the …

School Counselors’ Perceptions Of Developmental Guidance: A Qualitative Study, Lori A. Pashnik

Dissertations

A developmental emphasis is the fundamental core of the school counseling profession. However, Comprehensive Guidance and Counseling Programs (CG&CPs) that have been identified as developmental have been shown to have significant gaps with regard to developmental theoretical concepts. In addition, counselors who are implementing CG&CPs are unsure of how to put developmental principles into practice. This study explored how elementary and middle school counselors who currently implement CG&CPs perceive the developmental philosophical foundation of the program. A focus group methodology was used for this study to gain an in-depth understanding of elementary and middle school counselors’ perceptions of developmental guidance. …

Formal And Informal Institutions: Gender And Participation In The Panchayati Raj, Aparna Thomas

Dissertations

In April 1993, the Parliament of India passed the 73rd Constitutional Amendment, reforming the structure of local governments. The amendment mandated that the composition of local councils include at least one-third women. This study explores the effects of the 1993 Indian women's reservation bill in changing policies at the local government level in ways that address women's interests. Specifically, the research addresses the following questions: (1) Are women really participating in panchayati raj politics, or are they merely present? (2) Do quotas as institutional mechanisms make a difference in agenda setting and policy outcomes? Although it may be early to …

Monitoring The Effects Of Psychotropic Drugs In Students With Emotional Impairments: Home And School Data, Lynne E. Turner

Dissertations

Research has shown that schools do not typically participate in the systematic monitoring of psychotropic medications prescribed to school-aged children with emotional disorders. Conversely, research indicates that the information that is relayed to the prescribing physician from the schools consists, in general, of informal global reports regarding the student's overall behavior. Additionally, research evaluating systematic monitoring systems within schools has lacked input from the prescribing physician regarding relevant data to be collected. These findings provided impetus for the present project, which was an attempt to develop a practical system for schools to monitor possible desired and adverse effects of psychotropic …

Sustaining Innovation In Career And Technical Education, Brenda S. Clark

Dissertations

There has been little research done in education to determine what makes programs sustainable once the person who started the program has left or funding has decreased or disappeared. Innovative and successful programs are frequently started only to close or to reach a dead end. This study will seek to determine what components are necessary to sustain and grow a Career and Technical Education program. The primary audiences for the research study will be community college and university teacher preparation departments and career and technical education departments.

A survey was sent to Occupational Education Studies (OES) students and to OES …

Career Commitment And Retention Strategies For New Teachers: A National Study, A. Celeste Shelton-Harris

Dissertations

In spite of the logical link between new teacher support and retention, the attrition rate for beginning teachers continues to be greater than their more experienced colleagues. To this end, this study examined the relationship between new teacher career commitment and retention strategies across gender, race/ethnicity, and instructional level. Comprehensive national data, Schools and Staffing Survey (SASS) 1999-2000, were analyzed primarily utilizing chi-square and logistical regression tests. Key findings were found for new teachers with 3 years or less classroom experience. First, more beginners are "very committed" (62.3%) than "not so or not committed" (37.7%) to their chosen teaching career. …

Structural Equation Modeling As A Tool For Multisite Evaluation, Carl Edward Hanssen

Dissertations

Two fundamental purposes exist for program evaluation: to document program results and to improve programs. These purposes are commonly called summative and formative evaluation. The fundamental questions related to these purposes are (1) what occurred in the program? and (2) how can the program be improved? The answer to the second question implies the need to explain why program results occurred.

This dissertation developed an approach to support formative evaluation and answering the question of why program results occur. This approach integratedmultisite evaluation, theory-based evaluation and structural equation modeling. The context for this dissertation was the National Science Foundation's Advanced …

Controversial Maternal Roles Of Intrafamilial Child Sexual Abuse Cases, Rhonda Elliott Mcgee

Dissertations

The purpose of this study was to examine Child Sexual Abuse case files, to determine which "maternal role": (a) protector, (b) co-victim, (c) co-perpetrator/conspirator, or (d) perpetrator was the most common in court cases studied in this research. The researcher also sought to find: (1) The most dominant maternal role in reference to percentage; (2) The effect, if any, of certain "role types"; (3) And the consequences and/or effects of selected variables (e.g. age, race, and gender) had in family court decisions and adjudications.

The target population consisted of forty-one cases of Child Sexual Abuse cases, adjudicated by the Family …

“Imagined Communities” In Showcases: The Nationality Rooms Program At The University Of Pittsburgh (1926-1945), Lucia Curta

Dissertations

From the inception of the program in 1926, the Nationality Rooms at the University of Pittsburgh were viewed as apolitical in their iconography. Their purpose was primarily didactic. Designed as classrooms meant for lectures and seminars, they were however ad-hoc museums for the display of symbols of national identity. In many ways, they constitute an excellent illustration in terms of the decorative arts of Benedict Anderson's concept of "imagined communities."

The identity referent of the symbolism attached to the decorative arrangements of these rooms was not that of the ethnic communities in Pittsburgh, for whom the rooms were supposedly designed …

Affine Equivariant Multivariate Rank-Based And Generalized Rank Regression, Majeda Salman

Dissertations

Affine equivariant estimates for the regression coefficient matrix of the multivariate linear model are proposed. These estimates are based on a transformation and retransformation technique that uses Tyler's (1987) M -estimator of scatter. The proposed estimates are obtained by retransforming the componentwiserank-based estimate due to Davis and McKean (1993) and a componentwise generalized rank estimate. Asymptotic properties of the estimates are established under some regularity conditions. It is shown that both estimates have a multivariate normal limiting distribution. The influence function of the retransformed generalized rank estimate has a bounded influence in both factor and response spaces. It is shown …

New Techniques For Improving Biological Data Quality Through Information Integration, Katherine Grace Herbert

Dissertations

As databases become more pervasive through the biological sciences, various data quality concerns are emerging. Biological databases tend to develop data quality issues regarding data legacy, data uniformity and data duplication. Due to the nature of this data, each of these problems is non-trivial and can cause many problems for the database. For biological data to be corrected and standardized, methods and frameworks must be developed to handle both structural and traditional data.

The BIG-AJAX framework has been developed for solving these problems through both data cleaning and data integration. This framework exploits declarative data cleaning and exploratory data mining …

Optimization Studies Of Thermal Bimorph Cantilevers, Electrostatic Torsion Actuators And Variable Capacitors, Wuyong Peng

Dissertations

In this dissertation, theoretical analyses and optimization studies are given for three kinds of MEMS devices: thermal bimorph cantilevers, electrostatic torsion actuators, and variable capacitors. Calculation, simulation, and experimental data are used to confirm the device behavior and demonstrate the application of the design approaches.

For thermal bimorph cantilevers, an analytical model is presented which allows theoretical analysis and quantitative optimization of the performance based on material properties and device dimensions. Bimorph cantilevers are divided into two categories for deflection optimization: either the total thickness is constant, or the cantilever has one constant and one variable layer thickness. The optimum …

Non-Parametric Algorithms For Evaluating Gene Expression In Cancer Using Dna Microarray Technology, Virginie Aris

Dissertations

Microarray technology has transformed the field of cancer biology by enabling the simultaneous evaluation of tens of thousands mRNA expression levels in a single experiment. This technology has been applied to medical science in order to find gene expression markers that cluster diseased and normal tissues, genes affected by treatments, and gene network interactions. All methods of microarray data analysis can be summarized as a study of differential gene expression. This study addresses three questions, 1) the roles of selectively expressed genes for the classification of cancer, 2) issues of accounting for both experimental and biological noise, and 3) issues …

Relationship Analysis : Improving The Systems Analysis Process, Joseph Thomas Catanio

Dissertations

A significant aspect of systems analysis involves discovering and representing entities and their inter-relationships. Guidelines exist to identify entities but do not provide a rigorous and comprehensive process to explicitly capture the relationship structure of the problem domain. Whereas, other analysis techniques lightly address the relationship discovery process, Relationship Analysis is the only systematic, domain-independent analysis technique focusing exclusively on a domain's relationship structure.

The quality of design artifacts, such as class diagrams, and development time necessary to generate these artifacts can be improved by first representing the complete relationship structure of the problem domain. The Relationship Analysis Model is …

Characterization Of Ultrathin Gate Dielectrics And Multilayer Charge Injection Barriers, Edwin M. Dons

Dissertations

Since the invention of the first integrated circuit, the semiconductor industry has distinguished itself by a phenomenally rapid pace of improvements in device performance. This trend of ever smaller and faster devices is a result of the ability to exponentially reduce feature sizes of integrated circuits, a trend commonly known as "scaling". A reduction of overall feature sizes requires a simultaneous reduction in the thickness of the gate dielectric, SiO₂, of a MOSFET. Gate oxides in the ultrathin regime (<35 A) feature a large direct tunneling leakage current. The presence of this leakage current requires a reevaluation of standard characterization techniques as well as a reevaluation of the continued usefulness of SiO₂ as the gate dielectric of choice for future applications. On the other hand, a thorough understanding of …

Understanding The Origin Of The Recovery Of Superconductivity In Halogenated Ybco Single Crystal : Atomic Structure Study, Lamine Mohamed Kollakoye Dieng

Dissertations

The recovery of superconductivity in underdoped YBa₂Cu₃O_6+y (YBCO) by exposure to bromine, iodine, chlorine and fluorine is a long-standing problem which has not been clearly resolved. The key question concerns the role of these halogens in the lattice. In order to shed light to this problem, we have performed multiple-edge x-ray absorption fine structure (XAFS) measurements about the Y K, Ba L₃, I L₃, Cu K and Br K-edges at room temperature on brominated (non-brominated) and iodinated (non-iodinated) YBCO single crystals. Our XAFS results at the Br K (brominated) and I …

Mechanisms Of Layer-Transfer Related To Silicon-On-Insulator Structures, Bo Chen

Dissertations

The objective of this dissertation was to study the mechanisms that affect an efficient hydrogenation process in silicon and to validate a hypothesis concerning the hydrogenation mechanism of pre-implanted silicon wafers under hydrogen-plasma processing. These studies are related to a general process. A trapping layer for hydrogen was introduced by ion beam implantation into the silicon wafer. Next, this wafer was hydrogenated using a hydrogen plasma. It was hypothesized that the trapping layer acts as a getterer for the hydrogen diffusing into the silicon wafer. It was found that a large amount of hydrogen could be absorbed in the trapping …

Performance Evaluation Of Communication Systems With Transmit Diversity, Chunjun Gao

Dissertations

Transmit diversity is a key technique to combat fading with multiple transmit antennae for next-generation wireless communication systems. Space-time block code (STBC) is a main component of this technique. This dissertation consists of four parts: the first three discuss performance evaluation of STBCs in various circumstances, the fourth outlines a novel differential scheme with full transmit diversity.

In the first part, closed-form expressions for the bit error rate (BER) are derived for STBC based on Alamouti's scheme and utilizing M-ary phase shift keying (MPSK) modulation. The analysis is carried out for a slow, flat Rayleigh fading channel with coherent detection …

Efficient Similarity Search In High-Dimensional Data Spaces, Yue Li

Dissertations

Similarity search in high-dimensional data spaces is a popular paradigm for many modern database applications, such as content based image retrieval, time series analysis in financial and marketing databases, and data mining. Objects are represented as high-dimensional points or vectors based on their important features. Object similarity is then measured by the distance between feature vectors and similarity search is implemented via range queries or k-Nearest Neighbor (k-NN) queries.

Implementing k-NN queries via a sequential scan of large tables of feature vectors is computationally expensive. Building multi-dimensional indexes on the feature vectors for k-NN search also tends to be unsatisfactory …

A Discovery And Analysis Of Influencing Factors Of Pair Programming, Kyungsub Steve Choi

Dissertations

The exploration into the underlying psychosocial links of pair programming. a new and unorthodox programming paradigm in which two programmers share one keyboard and monitor during real-time programming sessions, is undertaken. These complex psychosocial relationships, along with cognitive process exchanges, ultimately mold the programming output as well as determine the level of communication, satisfaction. confidence and compatibility. Laying the framework for this research, a through review of traditional and contemporary paradigms with a special focus on their limitations and a list of current software development problems are presented. Next, a detailed summary of pair programming and related agile software paradigms, …

On Ip Over Wdm Burst-Switched Long Haul And Metropolitan Area Networks, Jingxuan Liu

Dissertations

The IP over Wavelength Division Multiplexing (WDM) network is a natural evolution ushered in by the phenomenal advances in networking technologies and technical breakthroughs in optical communications, fueled by the increasing demand in the reduction of operation costs and the network management complexity. The unprecedented bandwidth provisioning capability and the multi-service supportability of the WDM technology, in synergy with the data-oriented internetworking mechanisms, facilitates a common shared infrastructure for the Next Generation Internet (NGJ).

While NGI targets to perform packet processing directly on the optical transport layer, a smooth evolution is critical to success. Intense research has been conducted to …

The Design Of Adjustable Spherical Mechanisms Using Plane-To-Sphere And Sphere-To-Plane Projections, Wen-Tzong Lee

Dissertations

The spherical mechanism is a particular type of spatial mechanism. Due to the orientation of its joint axes and the curvature of its links, the workspaces of spherical mechanisms (whether line segments, closed loops or area regions) are spherical in curvature. This characteristic of spherical mechanisms makes them quite effective and practical in motion path and function generation applications requiring spherical rigid body kinematics.

Although there are design methods available for spherical mechanisms, most of these methods do not consider the design of a single adjustable spherical mechanism. With an adjustable spherical mechanism, the user could for example, relocate the …

Studies Of Disk Arrays Tolerating Two Disk Failures And A Proposal For A Heterogeneous Disk Array, Chunqi Han

Dissertations

There has been an explosion in the amount of generated data in the past decade. Online access to these data is made possible by large disk arrays, especially in the RAID (Redundant Array of Independent Disks) paradigm. According to the RAID level a disk array can tolerate one or more disk failures, so that the storage subsystem can continue operating with disk failure(s). RAID 5 is a single disk failure tolerant array which dedicates the capacity of one disk to parity information. The content on the failed disk can be reconstructed on demand and written onto a spare disk. However, …

Development Of Dynamic Recursive Models For Freeway Travel Time Predictions, Xiaobo Liu

Dissertations

Traffic congestion has been a major problem in metropolitan areas, which is caused by either insufficient roadway capacity or unforesceable incidents. In order to promote the efficiency of the existing roadway networks and mitigate the impact of traffic congestion, the development of a sound prediction model for travel times is desirable.

A comprehensive literature review about existing prediction models was conducted by investigating the advantages, disadvantages, and limitations of each model. Based on the features and properties of previous models, the base models including exponential smoothing model (ESM), moving average model (MAM), and Kalman filtering model (KFM) are developed to …

A Gibbs Sampling Approach To Maximum A Posteriori Time Delay And Amplitude Estimations, Michele Picarelli

Dissertations

Research concerned with underwater propagation in a shallow ocean environment is a growing area of study. In particular, the development of fast and accurate computational methods to estimate environmental parameters and source location is desired. In this work, only select features of the acoustic field are investigated, namely, the time delays and amplitudes of individual paths, the signal-to-noise ratio, and the number of multi-path arrivals. The amplitudes and delays contain pertinent information about the geometry associated with the environment of interest. Estimating the time delays and amplitudes of select paths in a manner that is both accurate and time efficient, …

Multi-Rate Access Schemes And Successive Interference Cancellation For Wireless Multimedia Mc-Cdma Communications, Mizhou Tan

Dissertations

To catch up with the fast changes of the information challenges, providing multimedia services has become a very important requirement for future wireless communications. A proper system, capable of supporting multi-rate transmissions as well as handling high quality of service (QoS) requirements in hostile wireless communication environments, should be sought. Multi-carrier CDMA (MC-CDMA), a combination of multi-carrier modulation (MCM) and direct-sequence CDMA (DS-CDMA), appears to be one of the most elegant solutions. In this dissertation, four multi-rate access schemes, termed uncoded fixed spreading length (UFSL), coded fixed spreading length (CFSL), multi-code fixed spreading length (MFSL) and variable spreading length (VSL), …

Boron And Phosphorous Implantation Into (100) Germanium : Modeling And Investigation Of Dopant Annealing Behavior, Yong Seok Suh

Dissertations

Germanium is increasingly being considered at this time for future silicon compatible optoelectronic and complementary metal oxide semiconductor (CMOS) device application. Germanium implantation will be a critical process for future device fabrication. However, critical properties like Pearson parameters and dopant activation temperatures are not well established. In this study, boron and phosphorus were implanted into (100) germanium with energies ranging from 20 to 320 keV and doses of 5 x 10¹³ to 5 x 10¹⁶ cm^-2. The behavior of the boron and phosphorus before and after annealing for 3 hours at 400, 600 or 800°C in …

3-D Numerical Simulation Of Reactive Extrusion And Its Application To Polymerization Of Ε-Caprolactone In Co-Rotating Twin-Screw Extruders, Linjie Zhu

Dissertations

A 3-D numerical simulation model was proposed to predict the polymerization of ε-caprolactone in fully-filled conveying elements and kneading blocks of co-rotating twin-screw extruders, in which the kinetics equation for polymerization is coupled with continuity equation, momentum equation, and energy equation. With the 3-D model, parametric studies have been carried out to investigate the effects of screw configurations, screw diameter, operational conditions, values of heat from reaction, initiator concentration, and heat transfer conditions at barrel surface upon the polymerization progress. Two simulation models for the polymerization in the partially-filled channels were developed based on the conveying mechanisms of the reaction …