Digital Commons Network^™

The Effect Of Rate Vs. Number Of Emissions Of An Operant Behavior On Behavior Probability, Michael D. Makepeace

Dissertations

The present study compared three conditions in the training of a set of operant responses on later probability of behavior that represented a generalization or co-adduction of the behavior emitted in training. In two of the conditions, the numbers of emissions of target responses were exactly equal; in a third condition, the number of emissions of target responses was a lesser quantity. The two conditions with an equal number of emissions of target responses were distinguished by the rate of responses yielded by contingencies surrounding training in each condition. In one of these conditions, subjects responded at a relatively low …

The Role Of Ethnicity Among International Students In Adjustment To Acculturative Stress, Mohd. Tajudin Hj Ninggal

Dissertations

This study examined whether there were differences in six acculturative stress themes among three Malaysian ethnic groups who were enrolled at Western Michigan University during the Fall, 1997 semester. The study also investigated whether the following demographic attributes: (a) gender, (b) academic major, (c) financial sponsorship, (d) family socioeconomic status, (e) type of residential setting, and (f) scores on the Test of English as a Foreign Language (TOEFL) affected Malaysian students in relation to the six acculturative stress themes: (1) Perceived Discrimination, (2) Homesickness, (3) Perceived Hate, (4) Fear, (5) Culture Shock, and (6) Guilt.

A total of 138 respondents …

A Study Of Local-Cosmopolitan Orientation With A University Support Staff, Sharon Carr

Dissertations

The purpose of this study is to identify the local-cosmopolitan orientation of a subset of university support staff members and to examine the relationship between that orientation and (a) gender, (b) age, (c) years of service, (d) percentage of business/financial tasks in one’s job, (e) percentage of time spent in direct contact with students, and (f) the self-perception of how essential one’s job is to the mission of the university. The local-cosmopolitan concept used was based on the definition by Qouldner (1957) and includes his three elements: loyalty, operational style, and reference group use. Each one of these elements, as …

Groundwater Hydraulics And Slope Stability Analysis: Elements For Prediction Of Shoreline Recession, William W. Montgomery

Dissertations

Studies documenting the roles that geologic materials and groundwater play in Great Lakes bluff recession are rare. This study reports findings concerning relationships between bluff lithology, bluff hydrology, and bluff recession along a 10-mile stretch of eastern Lake Michigan shoreline in heterogeneous Pleistocene deposes. According to a newly-developed, field-tested, GIS-based methodology, bluffs in the study area can be characterized lithologically as sand, clay, or mixed sand/clay, and can be characterized hydrologically as exhibiting either high head or low head.

Geotechnical analysis indicates that Atterberg limits, index properties, consolidation state, and drainage conditions affect the shear strength of bluff materials. Silty …

Molecular Staging Of Colorectal Cancer: K-Ras Mutation Analysis Of Lymph Nodes Upstages Dukes’ B2 Patients, Jennifer S. Thebo

Dissertations

The successful treatment of colorectal cancer depends upon the ability of staging systems to identify patients who are at risk for recurrence. The currently used systems fail in a significant number of patients. Multiple attempts have been made to improve upon these systems in order to provide better treatment for at-risk patients.

A variety of oncogenes and tumor suppressor genes have been implicated in colorectal cancer. Mutations in one of these, K-ras, occur in 40-60% of colorectal carcinomas. However, the relationship between specific mutations and clinical outcome is unclear.

The purpose of this study was to determine whether or not …

Microengineered Sensor Devices With Field Emission Electron Sources, Chao Sun

Dissertations

This dissertation describes the design, simulation, fabrication, and characterization of a microengineered pressure sensor device and a microengineered mass spectrometer device, both of which use field emission cathode tip arrays as electron sources. VLSI and MEMS process techniques are used to scale down the dimensions from existing vacuum pressure sensors and mass spectrometers.

The microengineered pressure sensor device is fabricated on a silicon substrate approximately 1cm by 1cm. It consists of an electron source in the form of cathode tip array structure, an electron accelerating space which includes a gas ionization volume, and an ion collection electrode. The electrons emitted …

Performance Analysis Of The Interference Adaptation Dynamic Channel Allocation Technique In Wireless Communication Networks, Ziqiang Xu

Dissertations

Dynamic channel allocation (DCA) problem is one of the major research topics in the wireless networking area. The purpose of this technique is to relieve the contradiction between the increasing traffic load in wireless networks and the limited bandwidth resource across the air interface. The challenge of this problem comes from the following facts: a) even the basic DCA problem is shown to be NP-complete (none polynomial complete); b) the size of the state space of the problem is very large; and c) any practical DCA algorithm should run in real-time.

Many heuristic DCA schemes have been proposed in the …

Orthogonal Transmultiplexers : Extensions To Digital Subscriber Line (Dsl) Communications, Xueming Lin

Dissertations

An orthogonal transmultiplexer which unifies multirate filter bank theory and communications theory is investigated in this dissertation. Various extensions of the orthogonal transmultiplexer techniques have been made for digital subscriber line communication applications.

It is shown that the theoretical performance bounds of single carrier modulation based transceivers and multicarrier modulation based transceivers are the same under the same operational conditions. Single carrier based transceiver systems such as Quadrature Amplitude Modulation (QAM) and Carrierless Amplitude and Phase (CAP) modulation scheme, multicarrier based transceiver systems such as Orthogonal Frequency Division Multiplexing (OFDM) or Discrete Multi Tone (DMT) and Discrete Subband (Wavelet) Multicarrier …

Enhanced Terahertz Pulse Generation And Detection Using Electric Field Singularities In Photo-Conducting Antennas, Yi Cai

Dissertations

In recent years, generation of ultra-short electromagnetic pulses with frequency components in the terahertz (THz) range has been achieved by various techniques. Among those different methods, photo-conducting antennas have proven to be the most efficient source of THz radiation. THz spectrometers utilizing such photo-conducting antennas as transmitters and receivers are meanwhile routinely used for spectroscopic studies in the frequency regime between 0.1 to 5THz, which can be covered by neither conventional optical nor microwave spectrometers. However, THz emission power from the existing photo-conducting antenna is not sufficient for many applications (such as electro-optic sampling for real time THz detection and …

A Model For Travel Mode Switching, Lei Cao

Dissertations

Transportation policy research assesses the effect of policy changes such as the imposition of a parking charge or the augmentation of passenger rail service, on individual travel behavior. Over the last few decades, Conditional Lo it Model has been strongly advocated among discrete choice models for transportation policy study due to its ease of estimation and realistic outcomes.

This dissertation analyzes the necessity of the entry of constraints in the indirect utility function. These functions are used in discrete choice models and form the basis for travel demand modeling. This dissertation proposes a hypothesis that the explicit entry of constraints …

Design And Characterization Of Ultra High Frame Rate Burst Image Sensors, Rakesh K. Kabra

Dissertations

This thesis research was aimed at investigating and designing novel architectures required for ultra high frame rate (UHFR) imagers capable of operating at frame rates in excess of 10⁶ frames/sec. To demonstrate the feasibility of these architectures, a 180 x 180 element UHFR-I imager was designed and fabricated. The imager chip stored the latest 32 frames at its on-chip memory locations rather than performing a continuous readout. It was demonstrated that this architecture approach could achieve a frame acquisition rate of 2 x 10⁶ frames/sec. Additionally, other novel design features were incorporated to minimize optical cross talk and …

Biodegradation Of Pah Contaminated Soil And Sludge Using Non-Ionic Surfactants, Seema Narula

Dissertations

Polycyclic aromatic hydrocarbons (PAHs) are one of the most prevalent environmental pollutants contaminating a large number of industrial and Superfund sites. Low solubility and sorption to solid surfaces limit biodegradation rates of PAHs in the environment. Bioremediation of these compounds have been previously tested with partial success. In the present study, aerobic biodegradation of three PAHs (fluorene, phenanthrene, and pyrene) has been studied in shaker flasks, batch fermenter, and bioslurry reactor, in the presence of non-ionic surfactants. A mixed bacterial culture derived from both a refinery sludge and an activated sludge was used as the seed population in the degradation …

Dual Material Gate Field Effect Transistor (Dmg-Fet), Wei Long

Dissertations

Improving performance and suppressing short channel effects are two of the most important issues in present field effect transistors development. Hence, high performance and long channel like behaviors are essential requirements for short channel FETs. This dissertation focuses on new ways to achieve these significant goals. A new field effect transistor - dual material gate FET (DMG-FET) - is presented for the first time. The unique feature of the DMG-FET is its gate which consists of two laterally contacting gate materials with different work functions. This novel gate structure takes advantage of material work function difference in such a way …

Flag : The Fault-Line Analytic Graph And Fingerprint Classification, Ching-Yu Huang

Dissertations

Fingerprints can be classified into millions of groups by quantitative measurements of their new representations - Fault-Line Analytic Graphs (FLAG), which describe the relationship between ridge flows and singular points. This new model is highly mathematical, therefore, human interpretation can be reduced to a minimum and the time of identification can be significantly reduced.

There are some well known features on fingerprints such as singular points, cores and deltas, which are global features which characterize the fingerprint pattern class, and minutiae which are the local features which characterize an individual fingerprint image. Singular points are more important than minutiae when …

Decentralized Reliable Control For Large-Scale Lti Systems, Zhengfang Chen

Dissertations

Reliable control concerns the ability of closed loop system to maintain stability and regulation properties during arbitrary sensor, controller, and actuator failure. Reliable control research has been an active research topic for more than 10 years.

Recent approach for reliable control includes the H∞ method, the algebraic factorization design, and the robust servomechanism control. These methods have been surveyed and discussed in this thesis with the robust servomechanism control methodology serving as the basis of the research development of this work.

In this thesis, the reliable control for large-scale, multi-input/output linear system is considered. Two concepts of reliable control …

Cantilever Beam Microactuators With Electrothermal And Electrostatic Drive, Murat M. Okyar

Dissertations

Microfabrication provides a powerful tool for batch processing and miniaturization of mechanical systems into dimensional domain not accessible easily by conventional machining. CMOS IC process compatible design is definitely a big plus because of tremendous know-how in IC technologies, commercially available standard IC processes for a reasonable price, and future integration of microma-chined mechanical systems and integrated circuits. Magnetically, electrostatically and thermally driven microactuators have been reported previously. These actuators have applications in many fields from optics to robotics and biomedical engineering.

At NJIT cleanroom, mono or multimorph microactuators have been fabricated using CMOS compatible process. In design and fabrication …

Micro Electromechanical Relays And Their Application In Variable Inductor Networks, Shifang Zhou

Dissertations

A family of microrelay devices together with integrated inductor networks has been designed, simulated, fabricated and experimental characterized. These switched networks utilize microelectromechanical systems (MEMS) as a fabrication technology and take advantage of the economies of semiconductor cleanroom batch-processing.

A new type of microrelay has been developed using a suspended TaSi₂/SiO₂ bimorph cantilever beam, gold-to-gold electrical contact, aluminum as sacrificial layer, and a combined thermal and electrostatic means of actuation. For the first time a micro variable inductor network which is digitally controlled by microrelays has been demonstrated. A test structure for electrical micro contact characterization has …

Numerical Study Of Three-Dimensional Free Convection From Semi-Enclosed Geometry And Discontinuous Heat Sources, Aklilu T.G. Giorges

Dissertations

Three-dimensional natural convection from three-by-three array of isoflux heat sources mounted on one vertical wall of semi-enclosed region has been numerically investigated. Detailed thermal information of this important engineering configuration is currently not available. The major objective of this study was to obtain this needed thermal and velocity information.

The semi-enclosed geometry can be viewed as a thin rectangular region with four closed and two open sides. The open surfaces are located at the top and adjacent side. For the fluid air, Pr = 0.71, the study covered a heat flux based Rayleigh number (Ra) range of (10² ≤ …

Effects Of Surfactants And Fenton's Reagents On Extraction And Destruction Of Phenanthrene In Spiked Sand, Ming-Chin Chang

Dissertations

In this study, surfactants and Fenton's reagents (Fe(II) and H₂0₂) ere proposed to solve contaminated site problems in situ on a lab scale. Phenanthrene is a simple PAHs (polynuclear aromatic hydrocarbons). The phenanthrene spiked ottawa sand simulated contaminated soil. HPLC was used for phenanthrene analysis because it provided excellent separation and no interference. Six surfactants (including nonionic and ionic) were tested. The operating conditions were optimized based on process and economic considerations such as reaction time, mixing speed, concentrations of surfactants and concentrations of Fenton's reagents. Surfactants could effectively dissolve phenanthrene from the spiked sand. In …

Transborder Economic Development: A Collaborative Partnership In The San Diego-Tijuana Region, Piedad Garcia Edd

Dissertations

The study seeks to understand and develop insights into the San Diego-Tijuana transborder economic collaborative partnership, by examining the Binational Planning and Coordination Committee (BPCC). This entity was established in 1993 via a Letter of Agreement between the City of San Diego and the municipality of Tijuana. Pursuant to the Letter of Agreement the BPCC is examined against the backdrop of the global economy, the emergence of region-states, U.S.-Mexico relations and transborder relations in the San Diego-Tijuana region. A qualitative single case-study methodology is applied to explain the role, function, structure, decision making processes and collaborative leadership relationships of the …

Storytelling In Project Heart To Heart: A Means To Bridge Generational Gap In Post-1965 Filipino Immigrant Families, Juanita Toledo Santos Nacu Edd

Dissertations

As we share our experiences with others, we also explore its meaning to ourselves and to whomever it is being shared with. This is how stories are told. Most families usually develop a body of stories that is passed on from one generation to the next generation. These stories are used to preserve the family member's identity, history, and values. The stories touch not only our past experiences, but also influences our present and links it to the future. This study explored the Filipino American families' experiences of storytelling as a means of bridging together past, present, and future experiences …

Leadership Responses To Change In 21st Century California State University Physical Education/Kinesiology Departments, Paulette Wong Hopkins Edd

Dissertations

A number of driving and restraining forces seem to foretell of a paradigm shift in today's post-secondary physical education departments. While the majority might agree that some change is inevitable, of utmost importance and concern is the manner in which change occurs. Left to the vagaries of chance, change can be chaotic and destructive; conversely, when effectively managed by leadership, controlled change can result in immense benefits. This study details leadership perspectives and views on driving and restraining forces that may impact California State University (CSU) physical education departments into the 21st century. It is believed that an analysis of …

Vh Gene Usage In Vha2 Allotype-Producing B Cells From Mutant Alicia Rabbits, Anusorn Boonthum

Dissertations

No abstract provided.

An Analysis Of Secondary School Teacher Attitudes Toward Instructional Technology Use In The Context Of Motivation Theory, Timothy G. Sassen

Dissertations

No abstract provided.

An Analysis Of The Gallup Poll Data Regarding The Public's Assessment Of The Public Schools From 1986-1995, Biancalana Venette Meucci

Dissertations

No abstract provided.

The Effects Of A Cooperative Learning Environment On Attitudes, Social Skills, And Processing Of Baccalaureate Nursing Students, Mary J. Cairy

Dissertations

The purpose of this study was to examine the effect of a deliberate, planned cooperative learning environment on the attitudes, social skills, and processing of baccalaureate nursing students. A convenience sample of 43 students (Registered Nurses) randomly assigned to one of eight cooperative learning groups were the subjects for this study. Cooperative learning was used as a teaching methodology for the entire class of 15 weeks duration. The study sought to answer the following questions: (a) What effect does a deliberate, planned cooperative learning environment have on the attitudes of BSN (Baccalaureate of Science in Nursing) students toward group work? …

Theoretical And Conceptual Lacunae In Sociological Theories Of Development: The Puerto Rican Anomaly, Dennis Malaret

Dissertations

Puerto Rico is presently facing serious economic and social problems which are characteristic of a neocolony. Many of these problems are associated with Puerto Rico's historical path of industrial development adopted in 1940s. This study, therefore, focuses on economic and development policies implemented in Puerto Rico since the early 1900s and the political and economic role the U.S. has played in such policies.

To understand Puerto Rico's structural problems, a theoretical framework has been developed. This framework combines developmentalist theories such as modernization, dependency, capitalist world economy and indigenous Puerto Rican theorizing. These theories have been critically assessed for their …

An Integrated Environment For Problem Solving And Program Development, Fadi Pierre Deek

Dissertations

A framework for an integrated problem solving and program development environment that addresses the needs of students learning programming is proposed. Several objectives have been accomplished: defining the tasks required for program development and a literature review to determine the actual difficulties involved in learning those tasks. A comprehensive Study of environments and tools developed to support the learning of problem solving and programming was then performed, covering programming environments, debugging aids, intelligent tutoring systems, and intelligent programming environments. This was followed by a careful analysis and critique of these systems, which uncovered the limitations that have prevented them from …

Fractionally Sampled Decorrelating Detectors For Time-Varying Rayleigh Fading Cdma Channels, Huaping Liu

Dissertations

In this dissertation, we propose novel decorrelating multiuser detectors in DSCDMA time-varying frequency-nonselective and frequency-selective fading channels and analyze their performance. We address the common shortcomings of existing multiuser detectors in a mobile environment, such as detector complexity and the error floor. An analytical approach is employed almost exclusively and Monte Carlo simulation is used to confirm the theoretical results. Practical channel models, such as Jakes' and Markovian, are adopted in the numerical examples.

The proposed detectors are of the decorrelating type and utilize fractional sampling to simultaneously achieve two goals: (1) the novel realization of a decorrelator with lower …

Analysis Of Safe Separation Distances From Natural Gas Transmission Pipelines, James Stephen Haklar

Dissertations

Accidental rupture of natural gas transmission pipelines with subsequent ignition of the escaping gas can result in the loss of life and property. In the United States, current means of protecting both the pipeline and the public include the establishment of class locations, in which specific pipeline design, construction and operation requirements must be attained. In addition, distances at which the pipelines can be safely set back from the community, called safe separation distances, have been developed in some European countries (e.g., Great Britain, the Netherlands) through use of risk assessment principles. However, to date there has been no simple, …