Digital Commons Network^™

Algorithms And Complexity Analyses For Some Combinational Optimization Problems, Hairong Zhao

Dissertations

The main focus of this dissertation is on classical combinatorial optimization problems in two important areas: scheduling and network design.

In the area of scheduling, the main interest is in problems in the master-slave model. In this model, each machine is either a master machine or a slave machine. Each job is associated with a preprocessing task, a slave task and a postprocessing task that must be executed in this order. Each slave task has a dedicated slave machine. All the preprocessing and postprocessing tasks share a single master machine or the same set of master machines. A job may …

Just-In-Time Hypermedia, Li Zhang

Dissertations

Many analytical applications, especially legacy systems, create documents and display screens in response to user queries "dynamically" or in real time . These documents and displays do not exist in advance, and thus hypermedia must be generated 'just in time" -automatically and dynamically.

This dissertation details the idea of 'just-in-time" hypermedia and discusses challenges encountered in this research area. A fully detailed literature review about the research issues and related research work is given. A framework for the 'just-in-time" hypermedia compares virtual documents with static documents, as well as dynamic with static hypermedia functionality. Conceptual 'just-in-time" hypermedia architecture is proposed …

High-Dimensional Indexing Methods Utilizing Clustering And Dimensionality Reduction, Lijuan Zhang

Dissertations

The emergence of novel database applications has resulted in the prevalence of a new paradigm for similarity search. These applications include multimedia databases, medical imaging databases, time series databases, DNA and protein sequence databases, and many others. Features of data objects are extracted and transformed into high-dimensional data points. Searching for objects becomes a search on points in the high-dimensional feature space. The dissimilarity between two objects is determined by the distance between two feature vectors. Similarity search is usually implemented as nearest neighbor search in feature vector spaces. The cost of processing k-nearest neighbor (k-NN) queries via a sequential …

Improving Document Representation By Accumulating Relevance Feedback : The Relevance Feedback Accumulation (Rfa) Algorithm, Razvan Stefan Bot

Dissertations

Document representation (indexing) techniques are dominated by variants of the term-frequency analysis approach, based on the assumption that the more occurrences a term has throughout a document the more important the term is in that document. Inherent drawbacks associated with this approach include: poor index quality, high document representation size and the word mismatch problem. To tackle these drawbacks, a document representation improvement method called the Relevance Feedback Accumulation (RFA) algorithm is presented. The algorithm provides a mechanism to continuously accumulate relevance assessments over time and across users. It also provides a document representation modification function, or document representation learning …

The Control Of Frequency Of A Conditional Oscillator Simultaneously Subjected To Multiple Oscillatory Inputs, Christina L. Ambrosio

Dissertations

A conditional oscillator is one that requires input to oscillate. An example of such is the gastric mill network of the stomatogastric ganglion of the crab Cancer borealis which requires modulatory input from outside the stomatogastric ganglion and fast input from the pyloric network of the animal in order to become active. This dissertation studies how the frequency of the gastric mill network is determined when it is simultaneously subjected to two different rhythmic inputs whose timing may be mismatched. We derive a mathematical model of the gastric mill network and deduce that the difference in timing between the pyloric …

A Versatile Programming Model For Dynamic Task Scheduling On Cluster Computers, Dejiang Jin

Dissertations

This dissertation studies the development of application programs for parallel and distributed computer systems, especially PC clusters. A methodology is proposed to increase the efficiency of code development, the productivity of programmers and enhance performance of executing the developed programs on PC clusters while facilitating improvement of scalability and code portability of these programs. A new programming model, named the Super-Programming Model (SPM), is created. Programs are developed assuming an instruction set architecture comprised of SuperInstructions (SIs). SPM models the target system as a large Virtual Machine (VM); VM contains functional units which are underlain with sub-computer systems and SIs …

Order Scheduling In Dedicated And Flexible Machine Environments, Haibing Li

Dissertations

Order scheduling models are relatively new in the field of scheduling. Consider a facility with m parallel machines that can process k different products (job types). Each machine can process a given subset of different product types. There are n orders from n different clients. Each order requests specific quantities of the various different products that can be produced concurrently on their given subsets of machines; it may have a release date, a weight and a due date. Preemptions may be allowed. An order can not be shipped until the processing of all the products for the order has been …

Characterization Of Mismatch Between Behavioral Stimuli And Frmi Data Using The Kalman Filter, Jason Steffener

Dissertations

The advance of blood oxygen level dependent function magnetic resonance imaging, (BOLD fMRI), allows researchers to non-invasively investigate the functioning human brain. The BOLD fMRI response to brief stimuli is called the hemodynamic response function (HRF), which can vary across brain regions and across subjects.

Models of the HRF are used to increase sensitivity of statistical maps; however, they often don't account for spatial and temporal variance. Physiological effects, such as learning, fatigue or habituation, introduce mismatch between statistical models and the data. Methods that use minimal a priori information and track time varying signals are able to show the …

Utility Of Remote Sensing Data In Retrieval Of Water Quality Consituents Concentrations In Coastal Water Of New Jersey, Ting Yu

Dissertations

Three important optical properties used for monitoring coastal water quality are the concentrations of chlorophyll (CHL), color dissolved organic matter (CDOM) and total suspended materials (TSM). Ocean color remote sensing, a technique to collect color data by detection of upward radiance from a distance (Bukata et al.,1995), provides a synoptic view for determining these concentrations from upwelling radiances. In the open ocean (Case-I), it is not difficult to derive empirical algorithms relating the received radiances to surface concentrations of water quality parameters. In coastal waters (Case-Il), there are serious unresolved problems in extracting chlorophyll concentration because of high concentration of …

Tcp Performance Enhancement In Wireless Networks Via Adaptive Congestion Control And Active Queue Management, Kai Xu

Dissertations

The transmission control protocol (TCP) exhibits poor performance when used in error-prone wireless networks. Remedy to this problem has been an active research area. However, a widely accepted and adopted solution is yet to emerge. Difficulties of an acceptable solution lie in the areas of compatibility, scalability, computational complexity and the involvement of intermediate routers and switches.

This dissertation rexriews the current start-of-the-art solutions to TCP performance enhancement, and pursues an end-to-end solution framework to the problem. The most noticeable cause of the performance degradation of TCP in wireless networks is the higher packet loss rate as compared to that …

High School Principals' Values And Their Symbolic And Cultural Leadership Approaches To Character Education In China, T.C. Kao Edd

Dissertations

Relatively little is known about the symbolic and cultural leadership practices and approaches used to imbed character education in high schools in China. In addition, there is a lack of published studies and reports investigating the revival between character and moral education in the Chinese school system. Without additional information, it is impossible to understand and develop effective leadership approaches that will shape and mold school cultures to effectively support both character and moral education. The literature reviewed in this study revealed little information about if, and in what form, there is a return to moral education focusing on traditional …

The Role Of Puf3 Protein Interactions In The Regulation Of Mrna Decay In Yeast Saccharomyces Cerevisiae, Shervin Sean Houshmandi

Dissertations

The regulation of messenger RNA (mRNA) metabolism is an important step in proper gene expression. In many eukaryotic organisms this regulation can be mediated by a group of highly conserved RNA-binding proteins known as the Puf family of proteins. The yeast Saccharomyces cerevisiae has several proteins that belong to this family. One of the yeast Puf proteins, Puf3p, binds and regulates the COX17 mRNA, which codes for a protein involved in mitochondrial copper transport. Specifically, Puf3p stimulates the decay of COX17 mRNA. However, the precise mechanism of Puf3p binding and decay regulation is yet unknown. The goal of this research …

Omesubel A Ureor: Workforce Development In Palau From Pre-Contact To 1999, Patrick Ubal Tellei Edd

Dissertations

After being a ward of many nations for over 250 years, the Republic of Palau gained its independence on October 1, 1994. One of the many challenges facing this young nation is the workforce preparation of its people to engage in nation building. After many years of being subjugated by foreign governments, the people have developed a taste of material consumerism. This has driven people away from their subsistence way of life in favor of a market driven economy which calls for infrastructure development that cannot be accomplished if there is a nonexistent skilled workforce to undertake this challenge. To …

From Presence To “E-Presence” In Online Nursing Education, Lisa M. Kaiser Phd, Msn, Bsn, Rn

Dissertations

Online web-based course offerings are now common in many institutions of higher education In response to the current and severe nursing shortage, estimated to represent a 20% vacancy rate by the year 2015, (Tarkin, 2003) many more universities have created online nursing courses for registered nurses wishing to continue their education in nursing. The National League for Nursing (NLN) set research priorities that urged exploration of the impact that technology has on the content and nature of teaching and learning in nursing education (1999). Using a series of separate synchronous, online focus groups and 1:1 interviews with nurse educator experts …

How School Counselors Gain Support To Implement Comprehensive Guidance And Counseling Programs, Jo Ann Grant Edd

Dissertations

The school counseling field is evolving from a focus on ancillary activities to a commitment to comprehensive guidance and counseling programs. Understanding strategies school counselors have used in gaining support from key stakeholders to implement comprehensive guidance and counseling programs can be a valuable addition to the literature of school counseling. The present study investigated how elementary and secondary school counselors gained support when implementing comprehensive guidance and counseling programs based on the National Standards for School Counseling Programs. A qualitative methodology was used in the study. The findings revealed that: (a) counselors studied believed their role in gaining support …

Global Citizenship As A Function Of Higher Education: The Demographic And Institutional Determinants In A Graduate Student Population, Jade G. Winn Edd

Dissertations

Over the last twenty years, the explosive growth in information technologies, combined with the globalization and easy access to other cultures, has allowed people to think of themselves more as citizens of the world than of a particular nation. Although the notion of “global citizenship” is often discussed in the popular press, little scholarly attention has been devoted to its measurement. Less attention has been paid to the role higher education plays in creating global citizens. To address these problems, a survey instrument was created to measure three facets of global citizenship: environmentalism, social justice, and civic responsibility, and was …

How Leaders Use The Construct Of Culture To Influence Change Resistance: A Study Of A Planned Change Initiative In A Combined Government And Military Organization, Derek R. Noether Edd

Dissertations

The construct of organizational culture has been used to interpret various aspects of organizational life, including organizational leadership and organizational change. The literature indicates that leaders can influence organizational change by attending to and modifying an organization's cultural dimensions. Much of this literature, however, is theoretical and speculative, and the empirical work that does exist has focused mostly on business. The purpose of this case study was to develop an understanding of how leaders in a combined government and military organization used the notion of culture during a two-and-a-half year planned change initiative. The study explored the strategies and mental …

To Be Or Not To Be: Status Of Guam's Middle Schools, Judith T. Won Pat Edd

Dissertations

In an effort to help middle school programs respond to the unique developmental needs of their students, in 1995 the National Middle School Association issued their influential list of twelve essential characteristics for a developmentally sound middle school. Although this paper spawned a significant amount of research regarding the importance of these essential characteristics, there has been little, if any, research in the last decade describing the extent to which these characteristics have been implemented in middle schools outside of the continental United States. To remedy this situation, this study surveyed all 471 middle school teachers on Guam as well …

Cognitive Orthotics For Students With Cognitive Disabilities, James V. Yanna

Dissertations

This study examined the effectiveness of a hand-held computer to guide an individual with a moderate cognitive impairment as he or she completed a complex daily living task. Performance was compared with that occasioned by a human supervisor. A third condition, assistance first from a human supervisor, and then by the computerized orthotic, was also evaluated. The task selected was a baking task.

Subjects were nine students, ranging in age from 17 to 24 years. All subjects were classified as cognitively impaired according to the Michigan Special Education Rules and Regulations. Assessment information showed most to be performing at a …

Navigating The Change Of Life: The Menopausal Transition Of Thai Immigrant Women, Bulaporn Natipagon-Shah Phd, Msn, Rn

Dissertations

Given that women continue to live more than three decades after menopause and their health and well-being in later life are determined by quality of health during the menopausal transition, menopause has become an important issue in the healthcare arena. The growing number of immigrant women in the United States signifies a need for healthcare providers to develop cultural knowledge and sensitivity toward each immigrant group regarding the issue of menopause. The purpose of this qualitative study was to build a substantive grounded theory of the experiences of menopausal transition among Thai immigrant women in the United States. Data collection …

An Examination Of The Media's Framing Of The Illegal Street Racing Issue, Kevin Andrew Igasaki Edd

Dissertations

For the last sixty years, the legal community and public policymakers have assumed that illegal street racing has appealed to a single portion of the driving population—young adults driving modified vehicles. However, this assumption has been based solely on anecdotal information and has never been empirically investigated in the literature. To remedy this situation, this mixed methodology study examined whether this narrow framing of the illegal street racing issue was present in two southern California newspapers and two nationally circulated magazines over a three-year time period. Specifically, this study examined the way in which this issue was framed in daily …

The Courage To Change: Striving For Magnet Hospital Recognition, Janet M. Jones Edd

Dissertations

In the ever-changing environment of health care, good leaders are of utmost importance to the effective functioning of the hospital. Leadership in the hospital setting requires innovativeness and courage. This means the passion to discover, create and experience the unknown. Until recently why some hospitals attract and retain good nurses while others do not was unknown. The magnet hospital concept identified attributes that supported the professional practice of nursing which, in turn increased nurse recruitment and retention. The objective of this study was to compare Chief Nursing Officer (CNO) and Chief Executive Officer (CEO) perceptions of their innovativeness and leadership …

The Role Of The Chief Instructional Officer Within The California Community Colleges, Patrick M. Schwerdtfeger Edd

Dissertations

California community colleges enroll one out of ten public college students in the United States. The Chief Instructional Officer (CIO) serves as leader within each college. Research examining CIOs in California is limited. This study investigates work performed by CIOs and the organizational factors which support or impede that work. Four questions guided this study. What is the role of the CIO—what do they do? What are the organizational factors which support or impede CIO effectiveness? How do the CIOs influence the enhancement of learning and instruction? What changes would CIOs suggest to become more effective leaders? This study relied …

Facing The Leadership Challenges On Decommissioning United States Navy Ships, Darren J. Mcglynn Edd

Dissertations

Since the late 1980s, hundreds of U.S. Navy ships have been decommissioned. Although ship decommissionings were postponed immediately after the September 11th attack, today the Navy is again engaged in “rightsizing” its force. Depending on the type of ship and its age, a ship faces different fates after the decommissioning process has been completed. Except on the rare occasion when a ship is turned into a museum, most decommissioned ships are disposed of in one of three ways. Some ships are sold to foreign navies to recoup some costs. Other ships are reassigned to the Military Sealift Command (MSC) to …

Confronting The Intra-Racial Gender Gap: A Quantitative Study Of The Impact Of Gender On African American Students' Perceptions Of Campus Climate At A Predominantly White Institution, Tiffany N. Carpenter Edd

Dissertations

For the last decade, the attainment gap in college graduation rates between Black males and females has continued to grow, despite the best efforts of researchers interested in identifying both its causes and suggesting possible policy remedies. Although much of the work has focused on the search for cognitive differences between African American males and females, there has been little, if any, research on the different ways that Black males and females may perceive their campus climate. In an attempt to broaden the literature in this area, this study examined the perceptions of 366 undergraduate African American students at a …

Culture And Motivation In Online Learning Environments, Frances A. Clem Edd

Dissertations

In the past, instructional design of online learning has largely ignored culture in the creation of online learning environments. Because research in the interaction of culture and online learning is very sparse, an exploratory, blended study was conducted to assess whether there is evidence that one measurable aspect of learners’ culture interacts with the online learning environment in ways that can be observed and identified, and whether this interaction impacts learners’ motivation and behavior in those environments. “Culture” is a complex concept consisting of many interrelated behaviors and values. For this reason, the study focused on one single aspect of …

Asian American Females In Educational Leadership In K-12 Public Schools, Dina Castillo Pacis Edd

Dissertations

The research on educational leadership has largely excluded the perspectives of women and minorities. As school age populations become increasingly diverse, the need for principals from diverse backgrounds also increases. However, the research data shows that females and ethnic minorities are underrepresented in educational leadership positions. In an effort to address the lack of minority females in educational leadership, particularly Asian American females, more research needs to be conducted on their perceived barriers to upward mobility, as well as their perceptions of educational leadership. Only when the voices of Asian American female minority administrators are heard, will they be better …

Linking Succession Planning To Employee Training: A Study Of Federal Employees, Douglas E. Fenner Edd

Dissertations

The purpose of this study was to examine whether differences emerged in federal male and female middle managers and supervisors' perceptions concerning organizational career development culture, succession planning components used for linking employee-training activities, reasons for succession planning and barriers impacting succession planning within their organization. Quantitative methodology supported this research study. A test-retest of the eighty-two-statement survey instrument was conducted for reliability among 40 participants (20 male and 20 female). The survey was then administered to 300 federal middle managers and supervisors (150 male and 150 female). Participants' grade level ranged from general schedule (GS) GS-12 to GS-15. Of …

The Interactive Roles Of Gender And Ethnicity In African-American Women's Mental Health, Dianna Nadine Moses-Nunley

Dissertations

Abstract For African-American women, female gender and African-American (AA) ethnicity combine to create experiences of discrimination, discrimination related stress, and mental health issues that are not encountered by individuals who occupy only one of these status variables. Gender and ethnicity also influence socioeconomic status, an additional variable affecting the experiences and issues that AA women uniquely encounter. The first goal of this study was to examine the ways in which the combined social statuses of gender and ethnicity influence the discriminatory experiences and mental health of AA women. The second goal was to determine the ways in which AA women¿s …

School Counselors' Perceptions About Female Participation In Non-Traditional Secondary Career And Technical Education (Cte) Programs, Rashida Khatoon Malik

Dissertations

The purpose of this study was to examine high school counselors' perceptions of female participation in nontraditional secondary Career and Technical Education (CTE) programs. The data for this study was collected from high school counselors in Michigan by sending them a survey containing 25 items. The first section of the survey covered the demographics of the participants. The second section consisted of eight belief statements about counseling femalestudents into nontraditional CTE programs. The third section of the survey had 12 belief statements about female participation in CTE nontraditional programs. The survey responses were based on five-point Likert scales. The belief …