Digital Commons Network^™

Theory And Design Of Mixed Lumped-Distributed Cross-Coupled Filters With Applications To Linear Phase Shifter And Tunable Filters, Sanghoon Shin

Dissertations

Using cross-coupled networks of a new concept, transmission zeros were efficiently located in the complex frequency-domain. With this approach, the group delay and attenuation slope of the circuit network can be controlled to get both sharp rejection characteristics and linear phase slopes. In order to achieve this performance, various types of combline filters are suggested. Various simulation tools (commercial linear circuit and E-M simulators), as well as the developed pole-zero locator program, were used to design a new class of cross-coupled networks. In particular, the polezero locator program can be used to extract an equivalent circuit of the topology that …

Two-Dimensional Reflectivity Polarization Elastometry Imaging Techniques (Piet) Of Soft Tissue, Hee Chuan Lim

Dissertations

A non-invasive polarized light reflection measurement method to measure the stretch of soft tissue, such as skin, is described. The technique utilizes changes in the reflectivity of polarized light intensity as a monitor of skin stretch. Measurements on in-vitro pigskin and invivo human skin show that the reflectivity of polarized light intensity increases linearly with stretch over a range. The changes in diffusive reflectivity properties of skin result from the alterations that take place in the roughness across the thickness of the skin layers due to stretch. Conceptually, as the roughness of a layer decreases with stretch, a smoother reflecting …

Process Control Of A Laboratory Combustor Using Neural Networks, Thana Slanvetpan

Dissertations

Active feedback and feedforward-feedback control systems based on static-trained feedforward multi-layer-perceptron (FMLP) neural networks were designed and demonstrated, by experiment and simulation, for selected species from a laboratory two stage combustor. These virtual controllers functioned through a Visual Basic platform. A proportional neural network controller (PNNC) was developed for a monotonic control problem - the variation of outlet oxygen level with overall equivalence ratio (Φ₀). The FMLP neural network maps the control variable to the manipulated variable. This information is in turn transferred to a proportional controller, through the variable control bias value. The proposed feedback control methodology …

Analysis Of Costs And Delivery Intervals For Multiple-Release Software, High-Way Sun

Dissertations

Project managers of large software projects, and particularly those associated with Internet Business-to-Business (B2B) or Business-to-Customer (B2C) applications, are under pressure to capture market share by delivering reliable software with cost and timing constraints. An earlier delivery time may help the E-commerce software capture a larger market share. However, early delivery sometimes means lower quality. In addition, most of the time the scale of the software is so large that incremental multiple releases are warranted.

A Multiple-Release methodology has been developed to optimize the most efficient and effective delivery intervals of the various releases of software products, taking into consideration …

An Analysis Of Field Data For Evidence Of Anaerobic Degradation Of Pah And Btex Plumes At Manufactured Gas Plant Sites, Georgene Mortimer

Dissertations

Field data (including geology, hydrogeology, soil chemistry, groundwater chemistry, and aquifer characteristics) were analyzed at eight MGP sites located in the New Jersey Coastal Plain. These data were used to calculate biodegradation rate constants, which were then compared with laboratory microcosm data and published values. Isopleths were drawn from the field data to indicate the dominant biodegradation mechanisms at each of the sites, and stoichiometric calculations were used to determine the total capacity of the electron acceptors present to degrade the plume contaminants. In examining these data, the protocol described by the Air Force Center for Environmental Excellence (AFCEE) was …

Collaborative Problem Solving And Program Development Model, Joanna Defranco-Tommarello

Dissertations

A model to enhance collaborative problem solving and program development is presented. The collaborative model is a detailed cognitive model that takes into consideration the cognitive and social activities that occur during collaborative problem solving and program development. The cognitive activities required for collaborative problem solving and program development are identified and integrated into a six-stage model. An extensive literature review in the associated fields is presented to show the need for the model described in this dissertation. In addition, a comprehensive study of tools to support collaboration during problem solving and program development was also performed as well as …

Concurrent Evaporating Spray Jets In Dilute Gas-Solid Pipe Flows, Xiaohua Wang

Dissertations

Evaporating spray jets into gas-solids suspensions are encountered in many industrial applications. The rapid evaporation of spray jets has significant effects on the gas-solids mixing near the jet nozzle regions, including non-uniform solids concentration dilution, gas/solids temperature reduction, and gas/solids velocity acceleration. Furthermore, the jet structure is altered by the change of solids loading, jet mass flow rate and initial droplet size distribution. These interactions of gas, solids and evaporating droplets dominate the process efficiency and product quality. There is an urgent need for exploring fundamental mechanisms of the multi-phase interactions with heat and mass transfer as there are few …

Genre Studies: Temporary Homogeneous Grouping To Improve Reading Or Merely Another Form Of Tracking?, Brenda Wright Campbell Edd

Dissertations

For the last fifty years, raising the achievement levels of students thought to be “at-risk” has proven to be one of the most difficult and vexing problems facing educators. Although many different strategies have been tried with varying levels of success, no single at-risk solution has emerged that both promotes significant achievement gains and helps to narrow the achievement gap between people of color and whites. This study examined the effectiveness of a particular district-wide literacy strategy in its first year that focused on literacy to educate students identified as “at-risk”. Specifically, this study used data gathered from two measures …

Role Perceptions Of School Nurses Who Work With Medically Fragile Students, Cay Chapman Casey Phd

Dissertations

In 1999, the Supreme Court ruled that school districts were financially responsible to provide related services including nursing services, to medically fragile students. This decision applied to children attending public schools who have complex health problems and are tracheostomy dependent. The purpose of this grounded theory study was to explore role perceptions of eighteen school nurses caring for these children in classrooms. Six dimensions emerged from the data: Promoting Family/Nurse Connections, Adapting the Environment, Claiming Authority, “Standing Out There”, Striking a Balance and Experiencing Success. Promoting Family/Nurse Connections emerged as the central perspective, essential to implementing a plan of care. …

Using Measures Of Intervention Integrity, Intervention Acceptability, And Intervention Effectiveness To Evaluate A Toilet Training Program In A Preschool Classroom For Children With Special Needs, Katherine M. Holverstott-Cockrell

Dissertations

The primary objective of this study is to use measures of intervention integrity, intervention acceptability, and intervention effectiveness identified by Witt and Elliott (1985) to evaluate the toilet training program in a preschool classroom. The second objective is to assess the effects of parent participation with the toileting program. The third objective is to assess the effects of the toilet training intervention. Specifically, this study investigated (a) the relationship between intervention integrity, acceptability, and effectiveness of a toilet training intervention implemented in a preschool setting and at home; (b) the relationship between parental participation with the intervention and the efficacy …

Documenting Lines Of Communication Between School Personnel And Physicians For Medication Evaluation Purposes For Students With Adhd, Pamela M. Radford

Dissertations

The purpose of this study was to document current and desired lines of communication between school personnel and physicians for the purpose of making medication decisions for students with ADHD. School-physician communication practices-were assessed utilizing a national survey of primary care physicians who are members o f the American Medical Association (AMA) and school psychologists who are members of the National Association of School Psychologists (NASP). Specific information exchange practices that were assessed included: (a) on what student characteristics is information collected (e.g., academic performance, disruptive behavior, social interactions), (b) how school-based information is collected (e.g., direct observations, rating scales), …

The Impact Of A Congenitally Blind Child Upon Family Functioning And Interaction, Pamela S. Berryman

Dissertations

The purpose of this study was to determine whether there was an impact of congenital blindness upon family functioning and interaction. This research investigated the level of blindness upon family adaptability, cohesion, satisfaction, and social family climate from a family systems perspective. The study analyzed data from a sample of 56 participants who were parents/care-givers of children age 0-12 years with either no vision, partial vision, or full vision. Chi-squares were computed to determine if any of the demographic variables differed among the three groups. Respondents’ gender, relationship to child, age, child’s level of blindness, number of siblings, and household …

Organizational Alignment: A Tool For Obtaining Greater Organizational Efficiency And Effectiveness In A State Government Agency, Patricia A. Collins

Dissertations

This study focuses on the modem day use of TQM, reengineering and privatization initiatives to gain efficiency and effectiveness in government operations, and the impact of alignment on the successful implementation of these three initiatives. A large state government agency which is currently using TQM, reengineering and privatization was used as a case study. Two-hundred-and-twenty-four employees were voluntary participants. This study examined three research questions: 1. Could the level of alignment, as hypothesized by Labovitz and Rosansky, be replicated with a sample of public agency employees? 2. Is the agency aligned, based on the Labovitz and Rosansky model, to successfully …

Using Bibliometric Journal Citation Analysis As A Technique To Assess Trends In School Psychology Journal Publications From 1995-1999, Meg Kwak

Dissertations

School psychology is a field influenced by die many different areas within psychology and education. School psychologists respond to many challenges and when working in the schools it is imperative that they stay abreast of the newest research findings. In order to remain informed, as well as to develop new knowledge, it is essential that professionals are aware o f the influences of the publications and the relative strength of specific journals (Kawano, Kehle, Clark, & Jenson, 1993). One way to assess publication trends is through journal citation analysis. Citation analysis is characterized by its objective ability to highlight the …

An Examination Of The Effects Of Fluency Training On Retention, Distractibility, And Generativity, Victoria Mary Pellettiere

Dissertations

The Precision Teaching movement grew out of a commitment to use frequency as a universal measure of behavior, as well as the desire to employ research methods derived from the experimental analysis of behavior in education (Lindsley, 1991). One component of instruction employing the precision teaching model is fluency training that typically involves exposing learners to the training materials until they have met criteria for both accuracy and speed. Proponents of fluency training ascribe a number of specific benefits to this instructional tool. Lindsley (1992, 1995) and others (Binder, 1993, 1996; Haughton, 1981b) suggested that fluency training enhances retention, endurance, …

Chemical, Isotopic, And Hydrogeologic Investigations Of An Agriculturally Impacted Area, Nottawa Creek Watershed, Calhoun County, Michigan, Gerald A. Unterreiner

Dissertations

A 4 km2 agricultural area within the somewhat poorly drained Nottawa Creek Watershed, south central Michigan, was investigated to help understand transport and transformation processes of nutrients and herbicides to surface water. Geology o f the study area is comprised of a thin glacial drift cover overlying shale bedrock. A one layer, two-dimensional numerical triangular finite element groundwater flow model was developed to evaluate regional groundwater flow. Selected horizontal hydraulic conductivities ranged from 3 x 10‘3 m/day to 107 m/day. Field-scale infiltration modeling with the computer program GLEAMS, substantiated with water level measurements, suggest significant recharge events occur during summer, …

A Study Of Quality Of Life Issues In Community-Dwelling Elders, Kimberly S. Mcclane Phd

Dissertations

In the year 2000, there were approximately 35 million people in the United States who were 65 years of age or older, a ten-fold increase since 1900. The growth of this population has presented opportunities and challenges to American society. Health care needs, physical changes of aging, and the allocation of health care resources are several of the issues that need to be addressed (Federal Interagency Forum on Aging-Related Statistics, 2000). Quality of life measurement tools have been used to assess the health and social needs of aging people both in the United States and internationally since their conception in …

A New Theory Of Premixed Flames In Near-Stoichiometric Mixtures, Eliana S. Antoniou

Dissertations

In this dissertation, a new model of premixed flames in near-stoichiometric mixtures is derived. Unlike most previous theories, which are valid only for very lean or very rich, i.e. off-stoichiometric conditions, our model remains valid over the entire spectrum of mixture compositions, from lean to rich, including the near-stoichiometric regime. Since fuel-mixture composition is known to have a significant effect on flame behavior, such a model is expected to contribute new insights into classical problems in premixed combustion.

In the first part of this dissertation, we describe the derivation of a model for premixed flames in two-reactant mixtures in a …

Simultaneous Removal Of Ortho-Dichlorobenzene And Ethanol Vapors In A Biotrickling Filter : Experimental Results And Process Modeling, Suchismita Bhattacharya

Dissertations

This study investigated the possibility of simultaneous removal of vapors of dissimilar volatile organic compounds from air streams in a biotrickling filter (BTF). Using a rricrobial consortium known to utilize ortho-dichlorobenzene (o-DCB) as sole carbon and energy source, a culture was developed on o-DCB/ethanol mixtures and a BTF unit was developed and operated with air streams carrying o-DCB and ethanol vapors. Simultaneous removal of the two compounds was observed in experiments that span a period of over three years.

Experiments were performed at air residence times ranging from 4 to 6.5 min, liquid flow rates from 3.6 to 9 Lh …

Numerical Simulation Of Mechanofusion System For Dry Particle Coating Process, Wenliang Chen

Dissertations

A numerical simulation of the Meclianofusion device for dry particle coating is carried out using Discrete Element Method (DEM) technique. In dry particle coating, tiny sub-micron guest particles are coated onto larger micron sized host particles by using mechanical forces, which the Mechanofusion device provides. It consists of a rotating cylindrical chamber that contains the powder mixture, a stationary inner piece (which has a cylindrical surface at the end), and a fixed scraper blade, which prevents powder from caking against the chamber wall. The simulation studies are performed on two scales: system scale to investigate the particle-particle and particle system …

On Performance Analysis And Implementation Issues Of Iterative Decoding For Graph Based Codes, Xuefei Wei

Dissertations

There is no doubt that long random-like code has the potential to achieve good performance because of its excellent distance spectrum. However, these codes remain useless in practical applications due to the lack of decoders rendering good performance at an acceptable complexity. The invention of turbo code marks a milestone progress in channel coding theory in that it achieves near Shannon limit performance by using an elegant iterative decoding algorithm. This great success stimulated intensive research oil long compound codes sharing the same decoding mechanism. Among these long codes are low-density parity-check (LDPC) code and product code, which render brilliant …

On The Data Hiding Theory And Multimedia Content Security Applications, Litao Gang

Dissertations

This dissertation is a comprehensive study of digital steganography for multimedia content protection. With the increasing development of Internet technology, protection and enforcement of multimedia property rights has become a great concern to multimedia authors and distributors. Watermarking technologies provide a possible solution for this problem.

The dissertation first briefly introduces the current watermarking schemes, including their applications in video,, image and audio. Most available embedding schemes are based on direct Spread Sequence (SS) modulation. A small value pseudo random signature sequence is embedded into the host signal and the information is extracted via correlation. The correlation detection problem is …

Inelastic Seismic Behavior Of Stiffening Systems : Multi-Span Simply-Supported (Msss) Bridges, Alireza Yazdani-Motlagh

Dissertations

Stiffening behavior can result from interaction between a structure (base system) and its surrounding environment as in the MSSS bridge soil-structure interaction. In this study, three MSSS bridge cases are parametrically analyzed and their dynamic characteristics and behavior are presented and discussed. Later, for investigating stiffening behavior, a simplified stiffening model is introduced and an extensive parametric study with more than 367,000 analyzed cases is performed. In the parametric study, different stiffening parameters (i.e., stiffness, strength, gap size, and mass), 41 strong motion records, and several damage criteria are considered and effects of the stiffening parameters variations on the dynamic …

Renegotiation Based Dynamic Bandwidth Allocation For Selfsimilar Vbr Traffic, Zafer Sahinoglu

Dissertations

The provision of QoS to applications traffic depends heavily on how different traffic types are categorized and classified, and how the prioritization of these applications are managed. Bandwidth is the most scarce network resource. Therefore, there is a need for a method or system that distributes an available bandwidth in a network among different applications in such a way that each class or type of traffic receives their constraint QoS requirements.

In this dissertation, a new renegotiation based dynamic resource allocation method for variable bit rate (VBR) traffic is presented. First, pros and cons of available off-line methods that are …

Elementary, Pressure Dependent Model For Combustion Of C1, C2 And Nitrogen Containing Hydrocarbons : Operation Of A Pilot Scale Incinerator And Model Comparison, Chad Sheng

Dissertations

A 140000 BTU/hr pilot scale incinerator has been constructed, tested and run; and an online sampling train capable of taking in situ data has been established. The continuous on-line analytical instruments include a CO analyzer, an NO/NOx analyzer and an 02 analyzer. In addition, two gas chromatographs with flame ionization detector are used to determine CH4, C2H2 + C2H4 and total hydrocarbon concentrations. Typical operating conditions are at an average 02 concentration of 6 - 8 %. The NO concentration ranged from 100 - 200 ppm. Approximately I ppm of CH.4 is also present at steady state operations.

The kinetic …

The Historical Background, Interconnected Development And Integration Of The Doctrines Of The Sanctuary, The Sabbath, And Ellen G. White's Role In Sabbatarian Adventism From 1844 To 1849, Merlin D. Burt

Dissertations

The topic . The doctrines of the sanctuary and the Sabbath, along with Ellen White's prophetic role, progressively evolved and integrated during the five years following the October 1844 Millerite time expectation and were the fundamental elements in the formation of the Sabbatarian Adventist movement and ultimately the Seventh-day Adventist Church.

The purpose . The purpose of the study was to situate the interconnected development of the sanctuary, the Sabbath, and Ellen White's prophetic ministry within the ferment of Adventist ideas and events, show the immediate theological climate, and give a connected progression of Bridegroom (or Shut Door) Adventism and …

Aircrew Adaptive Decision Making: A Cross-Case Analysis, Constance Ann Gillan Edd

Dissertations

Although the accident rate for military aviation has declined significantly from earlier decades, during the 1990's it reached a plateau. Human error in the cockpit still accounts for over 80% of the aircraft mishaps resulting in loss of life or over one million dollars in damage. Decision error has been a contributing factor for approximately 60% of these mishaps. The purpose of this research was to investigate aircrew process performance variables as predictors of decision-making outcomes. This study was modeled on elements of previous research in naturalistic decision making. Data were collected for cross-case analysis of the role experience plays …

The Relationships Between Attitude, Motivation, Anxiety, And Proficiency In English As A Second Language Of First-Year University Students In Puerto Rico, Carmen Mercedes Cortés

Dissertations

Purpose of the study. The purpose of this study was to determine the attitudes, motivation, and anxiety levels of first-year university students toward the learning and use of English as a second language. The study also examined the nature of the relationships between attitudes, motivation and anxiety, and English proficiency asmeasured by the College Entrance Examination Board.

Method. A Spanish version of The Attitudes/Motivation Test Battery (Gardner, 1985a), "Espejo de Actitudes: Aprendizaje del Inglés como Segundo Idioma en Puerto Rico," was administered to first-year college students at the University of Puerto Rico, Mayagüez Campus. These students came from various …

Veteran Teacher Perceptions Of The Grossmont Model Of Peer Assistance And Review. Is It A Viable Alternative To Traditional Evaluation?, Edwin L. Basilio Edd

Dissertations

This study looked at factors that influenced veteran teacher perceptions of the newly implemented Peer Assistance and Review (PAR) program in the Grossmont Union High School District. More specifically, the study explored (1) reasons why teachers with at least five years of successful teaching experience voluntarily chose to forfeit their regularly scheduled traditional evaluation and substitute it with a peer review, (2) factors that contributed to positive perceptions of the PAR program, (3) factors that contributed to negative perceptions of the PAR program, and (4) perceived differences between the traditional and PAR methods of teacher evaluation. This study incorporated multiple …

Variables Related To The Successful Completion Of The First Course In Business Calculus At Three Jamaican Universities, Martin Nkhrama Richards

Dissertations

Problem. Many students at all levels of the education system in Jamaica perform poorly at mathematics. In particular, the results of both the Caribbean Examinations Council and Business Calculus 1 at the university level have reflected a declining trend in mathematics performance in recent years. Consequently, this study sought to investigate the variables related to the successful completion of the first course in business calculus at Jamaican universities. To this end, the study looked at perceptions of students and their professors regarding students' cognitive, affective, and professor effectiveness variables impacting success.

Method. The sample for this study consisted of 389 …