Digital Commons Network^™

Analysis Of Marine Container Terminal Gate Congestion, Truck Waiting Cost, And System Optimization, Chang Qian Guan

Dissertations

As world container volume continues to grow and the introduction of 12,000 TEUs plus containerships into major trade routes, the port industry is under pressure to deal with the ever increasing freight volume. Gate congestion at marine container terminal is considered a major issue facing truckers who come to the terminal for container pickup and delivery. Harbor truckers operate in a very competitive environment; they are paid by trip, not by the hours they drive. Gate congestion is not only detrimental to their economic well-being, but also causes environmental pollution.

This thesis applies a multi-server queuing model to analyze marine …

A Bioinformatics Framework For Rna Structure Mining, Motif Discovery And Polyadenylation Analysis, Mugdha Khaladkar

Dissertations

The RNA molecules play various important roles in the cell and their functionality depends not only on the sequence information but to a large extent on their structure. The development of computational and predictive approaches to study RNA molecules is extremely valuable. In this research, a tool named RADAR was developed that provides a multitude of functionality for RNA data analysis and research. It aligns structure annotated RNA sequences so that both the sequence as well as structure information is taken into consideration. This tool is capable of performing pair-wise structure alignment, multiple structure alignment, database search and clustering. In …

Discreet Dynamical Population Models : Higher Dimensional Pioneer-Climax Models, Yogesh Joshi

Dissertations

There are many population models in the literature for both continuous and discrete systems. This investigation begins with a general discrete model that subsumes almost all of the discrete population models currently in use. Some results related to the existence of fixed points are proved. Before launching into a mathematical analysis of the primary discrete dynamical model investigated in this dissertation, the basic elements of the model - pioneer and climax species - are described and discussed from an ecological as well as a dynamical systems perspective. An attempt is made to explain why the chosen hierarchical form of the …

Road-Based Routing In Vehicular Ad Hoc Networks, Josiane Nzouonta-Domgang

Dissertations

Vehicular ad hoc networks (VANETs) can provide scalable and cost-effective solutions for applications such as traffic safety, dynamic route planning, and context-aware advertisement using short-range wireless communication. To function properly, these applications require efficient routing protocols. However, existing mobile ad hoc network routing and forwarding approaches have limited performance in VANETs. This dissertation shows that routing protocols which account for VANET-specific characteristics in their designs, such as high density and constrained mobility, can provide good performance for a large spectrum of applications.

This work proposes a novel class of routing protocols as well as three forwarding optimizations for VANETs. The …

Optimizing Replenishment Order Quantities In Uncoordinated Supply Chains, Atipol Kanchanapiboon

Dissertations

Many modern supply chains can be described as a series of uncoordinated suppliers. That is each supplier establishes their individual inventory and production policies on both the input and output sides. In these supply links there is minimal coordination between suppliers, and typically only prices and delivery guarantees are contracted. As a consequence, the inventory behavior and associated costs do not exhibit standard patterns. This makes it difficult to model and optimize these chains using classical inventory models. The common approach, therefore, for evaluating uncoordinated supply chains is to use Supply Chain Analytics software. These retrieve operational data from Enterprise …

Heterogeneous Flow Structure And Gas-Solid Transport Of Riser, Jun You

Dissertations

This study aims to understand physical mechanisms of gas-solid transport and riser flow, investigate heterogeneous flow structures of gas-solid transport and their formation mechanism of the in riser flows, both in axial and radial directions. It provides sound interpretation for the experimental observation and valuable suggestion to riser reactor design. Chemical reaction is also coupled with flow hydrodynamics to board the industrial applications. This study mainly focuses on mathematical modeling approach based upon physical mechanism, and endeavor to validate model prediction against available experimental data.

First of all, most important physical mechanisms including inter-particle collision force, gas/solid interfacial force and …

Numerical Detection Of Complex Singularities In Two And Three Dimensions, Kamyar Malakuti

Dissertations

Singularities often occur in solutions to partial differential equations; important examples include the formation of shock fronts in hyperbolic equations and self-focusing type blow up in nonlinear parabolic equations. Information about formation and structure of singularities can have significant role in interfacial fluid dynamics such as Kelvin-Helmholtz instability, Rayleigh-Taylor instability, and Hele-Shaw flow. In this thesis, we present a new method for the numerical analysis of complex singularities in solutions to partial differential equations. In the method, we analyze the decay of Fourier coefficients using a numerical form fit to ascertain the nature of singularities in two and three-dimensional functions. …

On Modeling And Mitigating New Breed Of Dos Attacks, Amey Bhaskar Shevtekar

Dissertations

Denial of Service (DoS) attacks pose serious threats to the Internet, exerting in tremendous impact on our daily lives that are heavily dependent on the good health of the Internet. This dissertation aims to achieve two objectives:1) to model new possibilities of the low rate DoS attacks; 2) to develop effective mitigation mechanisms to counter the threat from low rate DoS attacks.

A new stealthy DDoS attack model referred to as the "quiet" attack is proposed in this dissertation. The attack traffic consists of TCP traffic only. Widely used botnets in today's various attacks and newly introduced network feedback control …

Determinants Of Risky Sexual Behaviors Of Kenyan Immigrant Men In The Us And During Visits In Kenya, Japheth K. Kaluyu

Dissertations

Kenyan immigrant men originate from sub-Saharan Africa with the highest HIV prevalence in the world. The study hypotheses were: 1) Attitude towards condom use differs between Kenya and the US, 2) Condom use behavior with primary sex partners differ between Kenya and the US, 3) Condom use behavior with casual sex partners differ between Kenya and the US, 4) Sexual behaviors with casual partners differ between Kenya and the US, 5)Age affects risky sexual behaviors in the US, 6) Age affects risky sexual behaviors during visits in Kenya, 7) Income affects risky sexual behaviors in the US, 8) Income affects …

Sensorimotor Experience In Virtual Environments, Katherine Grace August

Dissertations

The goal of rehabilitation is to reduce impairment and provide functional improvements resulting in quality participation in activities of life, Plasticity and motor learning principles provide inspiration for therapeutic interventions including movement repetition in a virtual reality environment, The objective of this research work was to investigate functional specific measurements (kinematic, behavioral) and neural correlates of motor experience of hand gesture activities in virtual environments stimulating sensory experience (VE) using a hand agent model. The fMRI compatible Virtual Environment Sign Language Instruction (VESLI) System was designed and developed to provide a number of rehabilitation and measurement features, to identify optimal …

Enterprise Information Technology Organizational Flexibility : Managing Uncertainty And Change, Karen Prast Patten

Dissertations

Chief Information Officers (CIOs) lead enterprise information technology organizations (EITOs) in today's dynamic competitive business environment. CIOs deal with external and internal environmental changes, changing internal customer needs, and rapidly changing technology. New models for the organization include flexibility and suggest that CIOs should create and manage an enterprise IT organization that is more flexible in order to manage change and prepare for uncertainty, but they do not define what is meant by flexibility.

The first objective of this exploratory and ethnographic research study was to understand how uncertainty and unexpected change are currently managed by CIOs. The second was …

Leadership In Partially Distributed Teams, Linda Plotnick

Dissertations

Inter-organizational collaboration is becoming more common. When organizations collaborate they often do so in partially distributed teams (PDTs). A PDT is a hybrid team that has at least one collocated subteam and at least two subteams that are geographically distributed and communicate primarily through electronic media. While PDTs share many characteristics with both traditionally collocated and fully distributed teams, they also have unique characteristics and issues.

This dissertation reports on a field study of PDTs conducted over two semesters with student participants, This research was conducted as part of a larger series of studies investigating PDTs, In these studies, participants …

The Influence Of Organizational And Information Systems Factors On The Effectiveness Of Post-Merger Technology Integration, Gianilda A. Morsell

Dissertations

This dissertation explores how ten specific organizational and information systems factors influence post-merger IS integration success, and the role that degree of IS integration plays in moderating the influence these factors may have on IS integration success. Data were gathered, using a self-administered survey instrument, from senior IS executives at firms that experienced a U.S. public merger greater than $25 million between 2004 and 2007. Support is found for the study's Conceptual Model, indicating that all ten factors in unison influence post-merger IS integration success. The data support the hypotheses that quality of merger planning, quality of communication of merger …

Clustered Wireless Sensor Networks, Renita Margaret Machado

Dissertations

The study of topology in randomly deployed wireless sensor networks (WSNs) is important in addressing the fundamental issue of stochastic coverage resulting from randomness in the deployment procedure and power management algorithms. This dissertation defines and studies clustered WSNs, WSNs whose topology due to the deployment procedure and the application requirements results in the phenomenon of clustering or clumping of nodes. The first part of this dissertation analyzes a range of topologies of clustered WSNs and their impact on the primary sensing objectives of coverage and connectivity. By exploiting the inherent advantages of clustered topologies of nodes, this dissertation presents …

Enhancing Science Education Through Extracurricular Activities: A Retrospective Study Of "Suzy Science And The Whiz Kids©", Linda M. Kralina

Dissertations

Extracurricular activities (ECA) are informal settings offering free-choice experiences that are generally voluntary, open-ended, non-sequential, self-directed, hands-on, and evaluation-free. This mixed methods study investigates participation in a high school science ECA by collecting the memories of former student members for their perceptions of engagement as well as social positioning. First, this study examines the levels in which the science club engaged these members, particularly females, in science and teaching. Second, the study also ascertains how participation in the club allowed members to explore new identities and fostered the development of new skills, actions and behaviors, expanding possible future trajectories of …

Closing The Seed Dispersal Loop For Guettarda Viburnoides (Rub.): Connecting Patterns Of Avian Seed Dispersal With Population Growth In A Neotropical Savanna, Andrea Patricia Loayza

Dissertations

This study connects data on frugivore activity, post-dispersal seed fate and plant population demography using stage-specific demographic modeling to examine the role of individual dispersers for plant population dynamics of the fleshy-fruited Neotropical tree Guettarda viburnoides (Rubiaceae) in northeastern Bolivian savannas. Detailed information on frugivory and seed dispersal of G. viburnoides reveals that the endocarps of this plant are dispersed mainly by two species of birds: Cyanocorax cyanomelas and Pteroglossus castanotis, which are defined as the quantitatively important dispersers of G. viburnoides. These two species differ in several qualitative aspects of seed dispersal: 1) They select fruits of …

Tritrophic Interactions In Forests: Direct And Indirect Interactions Between Birds, Insect Herbivores, And Oaks, Nicholas Anthony Barber

Dissertations

This study examines direct and indirect relationships between three trophic levels to determine effects on plant damage, herbivore abundance and community structure, and bird distribution in forest ecosystems. Exclusion experiments on white oak (Quercus alba) revealed that bird predation effects to not vary spatially despite variation in abundance of both birds and insects. Using a leaf quality manipulation, I demonstrated that bird impacts do not differ with host plant quality. Rather, birds and plant traits had additive effects on herbivore damage. Bottom-up effects of leaf quality were also more important than top-down effects of birds in structuring the insect herbivore …

The Professional Learning Community Model Of Continuous School Improvement And The Effect On Job Satisfaction, Professional Collaboration, And Implementation Of Best Practices, Danielle Sullivan Tormala

Dissertations

The purpose of this study was to determine whether a greater number of years of participation in the Professional Learning Communities Project positively impacts professional staff perceptions of job satisfaction, professional collaboration, and implementation of best practices as defined by the ¿Critical Issues for Team Consideration¿ (DuFour et al., 2006, pp. 100-101). A total of 223 participants completed the self-reporting survey out of a total 481 eligible teachers, school administrators and other staff members. Participants were divided into groups based on the number of years their respective schools had been involved in the PLC Project for a between-groups approach to …

The Significance Of The Implied Mutual Duty Of Trust And Confidence In The Employment Relationship, Katie Mcdermott

Dissertations

Objectives: 1. Trace the development of the implied duty in the both the Irish and English jurisdiction. 2. Analyse the types of behaviour which will fall foul of the obligation to maintain trust and confidence. 3. Ascertain the limits of the implied duty. 4. Assess the current judicial climate following the first Supreme Court decision on the duty implied. 5. Consider the implications of the implied duty on certain areas of employment law. 6. Determine the potential for further development of the implied duty. Methods: Qualitative and Quantitative Research Conclusions: 1. The implied obligation is critically important in relation to …

Block And Traditional School Schedules: Comparison Of Student Achievement By Msat Scores And High School Science Teachers' Views, Robert Decker Smith

Dissertations

This study attempts to compare schools that are using a traditional scheduling format to a block scheduling format. Both critics and proponents acknowledge that the block schedule can provide more benefits than just student achievement. This study also attempts to address the perceptions of current Mississippi high school science teachers about the advantages and disadvantages to the block schedule as compared to the traditional schedule.

This study utilized MSAT test scores from 69 (34 block and 35 traditional) public schools throughout the state of Mississippi. This data was used to test 10 hypotheses. Student achievement was measured using both the …

For The Stadium Vendor, Richard Andrew Boada

Dissertations

FOR THE STADIUM VENDOR is an original collection of fifty poems accompanied by a preface.

Medical Negligence And Mrsa Claims:Is The Law Of Tort Efficient Enough?, Bridget Kelleher

Dissertations

In the last number of years, the Irish Health Service has come under major criticism. The emergence of Hospital Acquired Infections has sent the Health sector in to a state of disarray. The most common of these infections is Methicillin Resistant Staphylococcus Aureus (MRSA) which has now become a term of everyday language. By 1960, the United Kingdom (U.K) discovered that methicillin could combat this staphylococcus (staph) aureus infections. However by 1961,the staph aureus strain had evolved and created a new resistance to methicillin which became known as MRSA. The law of medical negligence, has devised it's own rules to …

"The Mirror Turn Lamp": Natural-Supernatural In Yeats, Cleston Lee Armstrong Iii

Dissertations

The supernatural portrayed in Yeats represents a carefully constructed convergence of all major themes in his canon. Yeats's first exposure to myth, the supernatural, and magic occurs in the 1890s when he worked as an editor of William Blake and Irish fairy lore. This experience at once inspired Yeats to explore mysticism and to shroud his own collected works in mystery. With the onset of modernity and the age of criticism this period ushered in, however, he was unable to capitalize on the spiritual as first imagined. As mere aesthetic, peculiar illuminations of the immaterial world Yeats so intensely sought …

A Case Study Analysis Of Organizational Crisis Communication During Hurricane Katrina, Rebecca Nell Woodrick

Dissertations

This study analyzed an educational organization's crisis communication with its employees regarding the devastation caused to the organization and to employees by hurricane Katrina in 2005. This study drew upon literature regarding communication in crisis and in particular, natural disaster crisis, to ascertain to what degree employees felt the organization engaged in characteristics of High Reliability Organizations. A case study approach employing both qualitative and quantitative data was utilized.

The data revealed that the organization was perceived by employees has having adequately communicated before and after Katrina. Data further revealed that the organization engages in behaviors consistent with practices of …

Understanding The Change Styles Of Teachers To Improve Student Achievement, Arlene May Green Bigby

Dissertations

The topic of this dissertation is the understanding of teacher change styles to improve student achievement. Teachers from public schools in a state located in the northern plains were surveyed regarding their Change Styles (preferred approaches to change) and flexibility scores. The results were statistically analyzed to determine if there were differences in change styles and flexibility scores when compared for level of certification, gender, length of teaching career, subject area taught, and size of school in which the educator was working. The results were also analyzed for any differences in the Change Styles and flexibility scores between teachers working …

Form Blindness Testing: Assessing The Ability To Perform Latent Print Examination By Traditional Versus Nontraditional Students, Dean James Bertram

Dissertations

This study examined form blindness testing as a predictor of latent print examination success among traditional and nontraditional college students. A correlational analysis of traditional versus nontraditional students was also assessed. Data were collected for two groups: trained and untrained. The untrained group (n = 167) consisted of students enrolled in courses within the field of forensic science at a university in the southeastern United States during the spring 2009 academic term. Students retained within the untrained group were those with no fingerprint training. The trained group (n = 160) consisted of students who completed a science of fingerprinting course …

Intimate Strangers And Estranged Intimates: An Investigation Of The Impact Of Instant Messaging And Short Message Service On The Size And Strength Of Social Networks In Kuwait, Bashaiar Al-Sanaa

Dissertations

Information and communication technologies (ICT) have revolutionized how people experience spatial proximity, reality, and connectivity. These technologies provide inexpensive access to anything and anyone in the world. They also replicate face-to-face interaction in cyber-space and allow for participation in numerous modes of social exchange.

People use Information and communication technologies to write web logs (blogs), send electronic mail (email), socialize through networking sites (such as Facebook and MySpace), text each other through mobile phone Short Message Service (SMS) and chat via online instant messaging (IM).With all these applications, a debate has ignited that actual physical communication is decreasing in favor …

The Impact Of Fast Forword On Mct Scores And Student Achievement, Michael Harvey Van Winkle

Dissertations

Educators today were concerned with how the No Child Left Behind Act of 2001 dealt with the improvement of education throughout the United States. Schools should have put forth a greater effort and reduced the achievement gap between different groups of students based on race, gender, special education status, and if that student was economically disadvantaged. A problem was identified as low student MCT scores in the state of Mississippi. A tutorial method that claimed to help improve students in the areas of reading and language was identified as Fast ForWord.

This study set out to find if there was …

The Relationship Of Principal Leadership Behaviors With School Climate, Teacher Job Satisfaction, And Student Achievement, Maurice Demond Williams

Dissertations

The purpose of this research was to determine how leadership behaviors of principals relate to school climate, teachers' job satisfaction, and student achievement. The relationship of leadership to student achievement was measured by the school levels based on the administration of the 2006-2007 Mississippi Curriculum Test (MCT). Leadership and teacher job satisfaction was determined by Paul Specter's Job Satisfaction Survey, and school climate was indicated by use of the School Climate Inventory (SCI).

Eleven schools in an east Mississippi school district were selected to participate in the research during the spring of 2008. Of the 129 randomly selected participants, 71% …

"Blessed Are The Dead Which Die In The Lord": The Influence Of The American Tract Society On The Historical Evolution Of American Literary Sentimentalism, Joel Bridges Henderson

Dissertations

Studies of American literary sentimentalism usually focus on either the genre's origins in the novels of the early republic or its zenith as represented by the midnineteenth- century bestsellers. Such a focus reveals two distinctly different versions of sentimentalism. While the novels of Susanna Rowson, Hannah Foster, and William Brown evidence a genre influenced by Calvinism, the bestsellers of Harriet Beecher Stowe, Maria Cummins, and Susan Warner represent a sentimentalism inextricably fused with nineteenth-century evangelicalism. The evolution of the genre is more clearly explained by the intervention of the American Tract Society (ATS). In its ongoing efforts to convert the …