Digital Commons Network^™

Individual-Based Artificial Ecosystems For Design And Optimization, Shivakar Vulli

Masters Theses

"Individual-based modeling has gained popularity over the last decade, mainly due to the paradigm's proven ability to address a variety of problems seen in many disciplines, including modeling complex systems from bottom-up, providing relationship between component level and system level parameters, and discovering the emergence of system-level behaviors from simple component level interactions. Availability of computational power to run simulation models with thousands to millions of agents is another driving force in the widespread adoption of individual-based modeling. This thesis proposes an individual-based modeling approach for solving engineering design and optimization problems using artificial ecosystems"--Abstract, page iii.

Via Transition Modeling And Charge Replenishment Of The Power Delivery Network In Multilayer Pcbs, Matteo Cocchini

Masters Theses

"In the first article of this thesis, the charge delivery in the power distribution network for printed circuit board has been analyzed in the time-domain. Performing all the simulations and analyzing the PDN physics and modeling, I contributed to a better understanding of the time-domain decoupling mechanism. The second paper studies the noise coupling sing a segmentation approach combined with a via-to-antipad capacitance model and a plane-pair cavity model. Building equivalent circuit models as well as analyzing design strategies, I contributed to a new approach for the PDN analysis in multilayer PCBs. The third article discusses how to estimate the …

Evaluation Of Su8 And Ruthenium Oxide Materials For Microfluidic Devices, Margaret Theresa Audrain

Masters Theses

"This thesis investigates two materials, SU8 photoresist and RuO₂, for possible incorporation into a self-calibrating microfluidic biosensor. The negative, epoxy based photoresist SU8 has been widely used in the fabrication of micro-electro-mechanical systems (MEMS) devices. This is due to its many desirable features that make it a suitable material for a wide variety of MEMS applications. The effects cross-linking (exposure dose) and bonding time have on bond strength and plasma modification of the SU8 surface were investigated as well as the bond strength of etched SU8. It was shown that adhesive bonding was an effective method of bonding, with bond …

Recovery Of Materials From Recycling Of Spent Furnace Linings, Phani Krishna Angara Raghavendra

Masters Theses

"The objective of this research study is to evaluate the technical feasibility of liberating metal entrapped in the spent melting furnace linings obtained from a non-ferrous metal producer and develop an economic technique to recycle all of the materials presently landfilled. Five to six million pounds of spent melting furnace linings are landfilled annually from this non-ferrous producer"--Abstract, page iii.

Critical Infrastructure Protection And The Domain Name Service (Dns) System, Mark Edward Snyder

Masters Theses

"Components of the critical infrastructure of any system are natural targets for attack. Any inherent weakness of such components can potentially expose the entire system to vulnerability. The Domain Name System (DNS) is one component of the proper functioning of the Internet. Although DNS is a relatively simple, isolated component, it serves as a straightforward example for the study of distributed systems in general, and as such, we have explored properties of DNS to examine how enterprise-scale, critical infrastructure components are vulnerable to attack, what protections are afforded to defenders of such components, the inherent weaknesses of such systems, and …

Ground Motion Sensitivity Analyses For The Greater St. Louis Metropolitan Area, Ece Karadeniz

Masters Theses

"Local site effects can play an important role in modifying the intensity of ground shaking and earthquake damage. The process of rock motion propagating through the soil column can be approximated using one-dimensional site response analyses. To evaluate the likely site response several input parameters are required. These include: thickness of the unconsolidated soil cap, shear wave velocity, unit density, dynamic soil properties, and acceleration time histories. Considerable uncertainty often exists in regards to these input parameters. In this study, the program Shake2000 was employed for site response analyses and sensitivity analyses were performed to determine how the uncertainties in …

Aflp Fingerprint Analysis Of Hybrid Salamanders In The Missouri Caverns Section Of Onondaga Cave, Maria Louise Potter

Masters Theses

"Two species and one subspecies of salamander in the genus Eurycea, two species of Plethodon and one species of Typhlotriton (recently considered to be Eurycea) salamander currently reside in an area of Onondaga Cave known as the Missouri Caverns section. Due to the presence of two known interbreeding subspecies of salamanders, Eurycea Longicauda (Long-tailed salamander) and Eurycea longicauda melanopleura (Dark-sided salamander), the possibility may exist for interbreeding of one or all of these taxa. Specifically, it is hypothesized that the two species of Eurycea longicauda may interbreed with Eurycea lucifuga (Cave salamander). through visual assessment and phenotypic analysis, …

Forecasting Using The T-Method, Parthiv Akshay Shah

Masters Theses

"The T-method is a technique developed by Genichi Taguchi to calculate an overall prediction based on the signal-to-noise ratio without the use of Gram-Schmidt orthogonalization. The Taguchi Methods, also known as robust design principles, is used to determine the optimal levels of control factors through planning and conducting experiments, and evaluating their results. The primary goal of Robust Design is to minimize variance in the presence of noise factors to achieve a robust process. T-Method is one of the techniques evolved from Taguchi Methods. This thesis illustrates the use of the T-method and outlines it steps using four forecasting case …

Co-Evolutionary Automated Software Correction: A Proof Of Concept, Joshua Lee Wilkerson

Masters Theses

"The task of ensuring that a software artifact is correct can be a very time consuming process. To be able to say that an algorithm is correct is to say that it will produce results in accordance with its specifications for all valid input. One possible way to identify an incorrect implementation is through the use of automated testing (currently an open problem in the field of software engineering); however, actually correcting the implementation is typically a manual task for the software developer. In this thesis a system is presented which automates not only the testing but also the correction …

A Hybrid Sensor Network For Watershed Monitoring, John R. Koch

Masters Theses

"This thesis discusses the Hydrological Hybrid Communication Sensor Network (HHCSN), which is designed for in situ measurement of various hydrological properties of a watershed. HHCSN is comprised of a network of sensor strings, each of which connects up to 100 sensing nodes on a communication line as long as 100 m. Each node includes sensors that measure soil attributes of interest, as well as a microcontroller with basic communication and processing capabilities. A relay point at the surface compresses data from the nodes and wirelessly transmits it to a base station that serves as a gateway to the outside world. …

Cross-Layer Design Through Joint Routing And Link Allocation In Wireless Sensor Networks, Xuan Gong

Masters Theses

"Both energy and bandwidth are scarce resources in sensor networks. In the past, the energy efficient routing problem has been extensively studied in efforts to maximize sensor network lifetimes, but the link bandwidth has been optimistically assumed to be abundant. Because energy constraint affects how data should be routed, link bandwidth affects not only the routing topology, but also the allowed data rate on each link, which in turn affects the lifetime. Previous research that focus on energy efficient operations in sensor networks with the sole objective of maximizing network lifetime only consider the energy constraint ignoring the bandwidth constraint. …

The Identification And Characterization Of Phenylalanine Ammonia-Lyase Gene Family Members In Glycine Max, Erin Kathleen Pringle

Masters Theses

"Gene families are collections of genes with similar functions. Studying gene families is important for understanding the evolution of genes and manipulating genes. Phenylalanine ammonia-lyase (PAL) is an enzyme found in plants. It catalyzes the deamination of phenylalanine to produce cinnamic acid. Genes for PAL have been identified in many different plant species. This project used the known sequence for the PAL1 gene in Glycine max to find other PAL genes in Glycine max"--Abstract, page iii.

Probabilistic Analysis Of Defect Tolerance In Asynchronous Nano Crossbar Architecture, Shikha Chaudhary

Masters Theses

"Among recent advancements in technology, nanotechnology is particularly promising. Most researchers have begun to focus their efforts on developing nano scale circuits. Nano scale devices such as carbon nano tubes (CNT) and silicon nano wires (SiNW) form the primitive building blocks of many nano scale logic devices and recently developed computing architecture. One of the most promising nanotechnologies is crossbar-based architecture, a two-dimensional nanoarray, formed by the intersection of two orthogonal sets of parallel and uniformly-spaced CNTs or SiNWs. Nanowire crossbars offer the potential for ultra-high density, which has never been achieved by photolithography. In an effort to improve these …

A Rapid Method For Determination Of Alpha Hydroxy Acids In Seawater And Biological Fluids At Trace Levels, Ryan Lee Schwiderski

Masters Theses

"Alpha hydroxy acids (AHAs) - carboxylic acids with a hydroxyl substitution on the alpha carbon are an important class of molecules. Hydroxy Methyl Thiobutanoic Acid (HMTBA) is an α-hydroxy analog of essential amino acid methionine; it finds extensive use as a feed supplement for avian and bovine species. Efficacy of alpha hydroxy acid uptake is important for nutritional studies and such studies rely on accurate and precise methods for determination of these chemicals in biological samples. Several methods for AHAs determination have been reported, however, the methods are tedious, requiring multiple sample preparation steps. Experiments reported in this thesis were …

An Approach For Human Swarm Interaction, Shishir Bashyal

Masters Theses

"This study shows that appropriate human interaction can benefit a swarm of robots to reach to goal more efficiently. The common belief in swarm robotics that user intervention adversely affects intelligence of the swarm is studied carefully to show that the traditional human-robot interaction approaches are not suitable for human swarm interaction. A set of desirable features for human swarm interaction is identified and an interaction architecture is proposed that has all of the desirable features. A swarm simulation environment is then created that allows simulating a swarm behavior in an indoor environment. Three different applications of the swarm are …

Synthesis Of Nanostructured Conducting Polymers And Their Application As Gas Sensors, Zhe-Fei Li

Masters Theses

"A single-step, bottom-up technique based on a nanostructured conducting polymer has been used to fabricate sensors. Small amounts of aqueous solutions of aniline, a dopant, and an oxidant were placed on an interdigitated electrode array. Ultraviolet (UV)-irradiation of the solutions enhanced polymerization, yielding a highly porous film of polyaniline nanofibers with mean diameters of around 100 nm and lengths on the order of 1 µm. Solutions that were not irradiated formed bulk-like polyaniline films. Nanofibers and bulk polyaniline sensors were exposed to vapors in an argon carrier gas including: chloroform, a weak proton donor; toluene, a vapor that causes polymer …

Thermal Characterization And Vibration Of Solder Alloys, Brandon Lee Brinkmeyer

Masters Theses

"Recent legislation and growing environmental concerns have forced the electronics industry to discontinue the use of tin-lead (SnPb) solder. Although the legislation did not directly affect aerospace and defense industries, future transitions to lead-free (LF) solders are inevitable. Differences exist between these high reliability systems and consumer electronics, first of which is a very small production rate and a long life cycle which often leads to repair or rework procedures which introduce the potential for mixing of SnPb and LF solder. In this study, Sn-3Ag-0.5Cu (SAC305) was mixed with Sn-37Pb solder in amounts of 0, 25, 50, 75, and 100 …

Behavior Of Full-Scale Rc T-Beams Strengthened In Shear With Externally Bonded Frp Sheets, Antonio Brancaccio

Masters Theses

"Shear deficiencies in many bridges may be considered even more critical than flexural deficiencies since shear failures occur without advance warning and are more catastrophic. Deficiencies in shear can be due to insufficient shear reinforcement, use of outdated design codes, a reduction in the steel area due to corrosion, or an increase in the service load due to change of occupancy for the structure.

In recent years, many research studies have investigated the shear behavior of reinforced concrete (RC) beams strengthened with fiber-reinforced polymer (FRP) composites, however, most of them were conducted on small-scale specimens. Thus, analytical models and design …

Victorian Restriction, Restraint, And Escape In The Children's Tales Of Beatrix Potter, Mandy L. Dewilde

Masters Theses

The fantasy works of Beatrix Potter have entertained children of all ages for decades. Many children are familiar with the stories of Peter Rabbit, Tom Kitten, The Flopsy Bunnies, and the dreamy prints of fuzzy little animals in jackets and aprons that accompany them. The characters of Beatrix Potter’s beloved children’s stories have transcended the written page and been marketed on infant layettes, children’s dinnerware, stationary, bedroom linens, and even on cartons of infant formula. However, beneath these cheery stories, which seem to imply that children should perhaps heed their parents’ advice concerning socially accepted conduct. Potter’s …

The Circle And The Cross: The Self-Destructive Nature Of Evil In Edmund Spenser's Faerie Queene, Scott De Young

Masters Theses

The theme of good and evil is at the forefront of Edmund Spenser’s Faerie Queene'; can virtue survive and overcome vice? Because this theme is widely prevalent in The Faerie Queene, it is fittingly prevalent in the existing scholarship on The Faerie Queene. When commenting on the workings of evil in The Faerie Queene, most scholars tend to focus on either the historical or literary influences on Spenser’s evil characters, or they focus on the manner in which evil poses a threat to good. I am in no way arguing against these scholars. My contention, though, …

A Narrative Study: Exploration Of Arts And Crafts As Meaningful Productivity In A Middle-Old Adult Who Resides In An Independent Living Facility, Sara E. Thornburg

Masters Theses

This qualitative study explored the meaningfulness of engagement in arts and crafts in one older adult who resides in an independent living facility. A narrative approach was used and one participant was purposefully selected for the study. Data was collected through the use of semi-structured interviews. Additional data sources included the participant’s book of memories, artifacts, and photos. Analysis consisted of thorough readings of the data and the development of a chronology from the participant’s stories and hook of memories. Participant feedback and peer debriefing was elicited in order to insure validity of the researcher’s findings. Consistent with narrative research, …

What Comes Next, Mario Podeschi

Masters Theses

A narrator named Mario Podeschi watches a character named Mario Podeschi be sent back in time from graduate school to his freshman year of high school. A twenty-four year old in a fifteen year-old body, the Mario character retains aH of his old memories leading up to Spring of2008 and tries to use them to his own benefit at his small town Illinois high school. Fifteen year-old Mario readdicts himself to cigarettes, chases high school crushes, and distances himself from his old friends. Not that his second chance at high school is a complete failure~he finds his soulmate in Saturday …

Cutting Back The Mask: Character And Coiffure In Fiction By F. Scott Fitzgerald, Ernest Hemingway, And Robert Penn Warren, Lisa Anne Powell

Masters Theses

Realistic fiction has recorded changing fashions of architecture and landscape, clothing and coiffure. For at least three centuries, writers of narrative have described the clothing and the hairstyles of their fictional women both to set them within a specific time ar place and to offer a key to their character. Hair as natural endowment and artificial adornment has served as an essential component to the character costume. Novelists have understood that women send messages, albeit sometimes unconscious ones, about themselves, their lives, and their feelings through the style, color and length of their hair. Writers have sometimes described women's hair …

Expanding Composition's Scope: Community-Based Literacy And Second-Language Writing, Carolina Pelaez-Morales

Masters Theses

There is little research from either Composition Studies or Second-Language Studies on the development of writing competence among English language learners, paiiicularly adult learners outside academia. In response to this need, I conducted a case study of a small group of Spanish-native speakers as they learned English through a volunteer-based community program in a small Midwestern town. This project establishes the role writing plays in a community of second-language learners-primarily motivated by economic factors to learn English-and it shows ways in which the development of writing competence can enhance overall language proficiency. Also, this study calls for further research in …

Passage Through The Ocean: The Female Heroic Journey In The Novels Of Anita Desai, Jaime Pedigo Hendrix

Masters Theses

This study examines the female heroic journey in relation to the protagonists in three of Anita Desai's novels: Maya in Cry, the Peacock, Sita in Where Shall We Go This Summer, and Bim in Clear Light of Day. The elements of the heroic journey as described by Joseph Campbell in Hero with a Thousand Faces illuminate the journeys of Desai's characters, as certain of these elements appear in all three of the characters' journeys toward adulthood. The work of C. G. Jung is also central to this study, as his theories on psychological development are utilized to show the growth, …

Educated Mothers At Home: Motivation, Expectations, And Experiences, Adrienne Lynn Riegle

Masters Theses

This studuy explored the motivation for educated stay-at-home mothers (SAHНMs) to stay at home with their children and examined expectations and experiences regarding their decision. Twenty-two participants earned the minimum of a bachelor's degree or higher prior to staying at home with their own children for a period of at least 1 year and responded to an online survey of demographic information and open-ended questions. Qualitative data analysis led to a theoretical model of the SAHM experience. The model included 3 specific concepts: 1) individual interests as motivation; 2) commitment to and identity associated with the SAHM; and 3) the …

Applying The Theory Of Planned Behavior On Consumption Of Fruits And Vegetables Among University Students, Angie Ison

Masters Theses

The purpose of this study was to examine the fruit and vegetable consumption among university students applying the Theory of Planned Behavior (TPB) by examining a) university students' fruits and vegetables perceived intake b) university students' knowledge on benefits of fruits and vegetables intake; c) reason for limited intake of fruits and vegetables d) motivating factors that influence increased intake, e) who and/or what caused significant impact in decision making on eating fruit and vegetable. Three hundred fifty-six students participated in the study and completed a survey with 64 questions. The questionnaire was designed to assess knowledge on the benefits …

The Effect Of Social Pressure On Eating Habits Of College Students, Dawn Wilcox

Masters Theses

Food consumption is affected by a variety of factors including social pressure. A quasi-experimental design was used to determine the relationship between social pressure and food consumption in a restaurant environment. The study addressed the specific effect of one person’s decision to order or decline a second portion on fellow diners' consumption of beverages, salads, side dishes, entrées, and desserts. The research protocol was approved by the Institutional Review Board. A convenience sample of male and female college students (n=65) participated in a one hour dining experience in a restaurant setting. Subjects were randomly assigned to the control or treatment …

College Debt: An Exploratory Study Of Risk Factors Among College Freshmen And Its Effect On College Choice, Renee M. Smith

Masters Theses

College student loan debt has become an increasing concern in recent years. There has been a steady increase in the number of students taking out loans and in the total amounts borrowed for a college education (CollegeBoard, 2006). The majority of college students will graduate with some amount of college debt, but some graduates leave school with much higher loan debt than others. It is important to examine what makes some students more willing to take on higher educational loan debts than other students.

The primary purpose of this study was to explore risk factors associated with educational debt and …

Evangelical Religion And Benevolent Reform In The Antebellum Urban Southwest: Natchez And Vicksburg, Mississippi, 1800-1860, Matthew S. Berry

Masters Theses

The United States' early history was marked by two periods of religious revival called "Great Awakenings." Beginning in the early nineteenth century grassroots Christian denominations began growing, mostly out of the Northeast, and spread throughout the country as land began to open in the West. This paper expands the historiography of the South during the Second Great Awakening. It adds to the broader discussion the interaction of two important urban areas with the churches and organizations of the Second Great Awakening. Most importantly it attempts to explain the discrepancy between explosive population and economic growth with the slow development of …