Digital Commons Network^™

Design And Implementation Of A 20 Ghz Ultra-Wide Bandwidth Channel Emulator For Differential High Speed Serial Data Links, Wei Qian

Masters Theses

"High speed serial link is now the dominant signal propagation design in various communication, computing and embedded applications. Emulation of such channels is important in signal integrity design and product testing, where full channel simulation is restricted due to the need for protection of intellectual property and frequent channel reconfiguration. This thesis introduces robust lossy material and FIR filter design methods that can be used for channel emulation to provide a solution under these restrictions. Based on the channel characterizations normally obtained in the frequency domain by vector network analysis, different emulation strategies and optimization techniques are utilized to emulate …

A New Technique For Modeling The Geomorphology Of A Slow Moving, Soft-Slope Landslide Using Terrestrial Lidar, Nathan Bradley Rohrbaugh

Masters Theses

"Soft slope movement is a big problem whether it involves an engineered slope, one that is near infrastructure, or both. Active landslides that fail slowly sometimes allow ample time to affect remedial works. In order to plan effective remedial works, there needs to be a model of the entire geometry of the slide. This thesis describes a new approach to evaluate the morphology of slope geometry using Light Detection and Ranging (LiDAR) data obtained from simple targets strategically positioned on a slide body. The data was gathered in three-month intervals over a period of one year to allow enough time …

Emi Analysis Of Dvi Link Connectors, Abhishek Patnaik

Masters Theses

"EMI problems are not uncommon in high speed communication systems. As the system clock frequencies increases, so does the challenges in controlling the EMI in such systems. A connector is a very important part of a high speed communication system. Electromagnetic interference (EMI) is found to be tightly correlated to mode conversion: from differential-mode (DM) signals to common-mode (CM) currents and further to antenna-mode (AM) currents on the outside of cables or enclosures. Moreover, in such high speed systems, coupling to an adjacent cable-connector system is not uncommon. It is essential to understand and quantify this coupling path in order …

A Valuation Model For Two-Stage Contract Negotiations Over Multiple Interdependent Issues, Nnaemeka U. Amaeshi

Masters Theses

"Most real-world negotiation scenarios involve multiple interdependent issues over which the negotiating parties will seek an agreement. Simultaneous negotiation over multiple interdependent issues is an especially challenging problem because utility functions of negotiating agents are typically nonlinear and difficult to analyze. Also, negotiations often happen under circumstances of incomplete information, where either party has either little or inaccurate information about the preferences or utilities of the other party. Consequently, negotiations may go over multiple rounds until a mutually acceptable agreement is reached. The objective of this research is to create a quantitative model of decision-making that helps one negotiating party …

A Novel Entropy Production Based Full-Chip Tsv Fatigue Analysis, Tianchen Wang

Masters Theses

"Through-silicon vias (TSVs) are subject to thermal fatigue due to stress over time, no matter how small the stress is. Existing works on TSV fatigue all rely on measurement-based parameters to estimate the lifetime, and cannot consider detailed thermal profiles. In this paper, we propose a new method for TSV fatigue prediction using entropy production during thermal cycles. By combining thermodynamics and mechanics laws, the fatigue process can be quantitatively evaluated with detailed thermal profiles. Experimental results show that interestingly, the landing pad possesses the most easy-to-fail region, which generates up to 50% more entropy compared with the TSV body. …

Design And Implementation Of Low Complexity Wake-Up Receiver For Underwater Acoustic Sensor Networks, Ming Yue

Masters Theses

"This thesis designs a low-complexity dual Pseudorandom Noise (PN) scheme for identity (ID) detection and coarse frame synchronization. The two PN sequences for a node are identical and are separated by a specified length of gap which serves as the ID of different sensor nodes. The dual PN sequences are short in length but are capable of combating severe underwater acoustic (UWA) multipath fading channels that exhibit time varying impulse responses up to 100 taps. The receiver ID detection is implemented on a microcontroller MSP430F5529 by calculating the correlation between the two segments of the PN sequence with the specified …

Cyber Security Research Frameworks For Coevolutionary Network Defense, George Daniel Rush

Masters Theses

"Cyber security is increasingly a challenge for organizations everywhere. Defense systems that require less expert knowledge and can adapt quickly to threats are strongly needed to combat the rise of cyber attacks. Computational intelligence techniques can be used to rapidly explore potential solutions while searching in a way that is unaffected by human bias.

Several architectures have been created for developing and testing systems used in network security, but most are meant to provide a platform for running cyber security experiments as opposed to automating experiment processes. In the first paper, we propose a framework termed Distributed Cyber Security Automation …

Investigation Of Decoupling Capacitor Connection Methods Using Peec And Study Of Alien Crosstalk From A Broadr-Reach® Protocol Based System, Tamar Makharashvili

Masters Theses

"Power Distribution Network (PDN) for Printed Circuit Board (PCB) design requires proper power integrity analysis. In order to deliver a low-ripple DC voltage from a Voltage Regulator Module (VRM) to an Integrated Circuit (IC), a certain target input impedance should be achieved. Developing simple physics-based equivalent circuit models are essential for understanding how a system works and making crucial design decisions. In this work, the input impedance of a decoupling capacitor due to traces, pads and via discontinuities are investigated using the Physics-based Model Size Reduction (PMSR) method. Various decoupling capacitor connection methods are compared and design guidelines are provided …

The Impact Of A Strong Local Supply Chain On Regional Economic Impacts Of Mining, Meiyu Xing

Masters Theses

"With growing social conflicts due to social and environmental concerns mines need to be able to create shared value for all stakeholder in their quest to promote sustainable development. Given the sensitivity of a mine's regional economy contribution to its supply chains, any improvement in supply chains strategy will be beneficial for mines and their stakeholders. The objectives of this work were to: (i) test the hypothesis that supply chain management strategy, by mines in a region, significantly affects regional economy; and (ii) develop a methodology to identify the critical backward commodities of a regional mining sector.

Valid methods have …

Uncertainty Quantification Of Turbulence Model Closure Coefficients For Transonic Wall-Bounded Flows, John Anthony Schaefer

Masters Theses

"The goal of this work was to quantify the uncertainty and sensitivity of commonly used turbulence models in Reynolds-Averaged Navier-Stokes codes due to uncertainty in the values of closure coefficients for transonic, wall-bounded flows and to rank the contribution of each coefficient to uncertainty in various output flow quantities of interest. Specifically, uncertainty quantification of turbulence model closure coefficients was performed for transonic flow over an axisymmetric bump at zero degrees angle of attack and the RAE 2822 transonic airfoil at a lift coefficient of 0.744. Three turbulence models were considered: the Spalart-Allmaras Model, Wilcox (2006) k-ω Model, and the …

Adaptable Ring, Bayes Theorem And Dual Gradient Analysis: An Approach To Automatic Shape Detection, Skin Lesion Segmentation And Focus Detection Respectively For Medical Image Analysis, Kanakam T. Maddala

Masters Theses

“Vision-based applications are increasing with the increase in technology and are making a huge impact in this global civilization. A vision-based measurement approach for pill shape detection was developed for medical pill identification, a focus detection method was developed for digital dermoscopy, and a machine learning approach was used for automatic lesion segmentation, which assists in automatic melanoma diagnosis. Rapid and accurate pill identification is needed by medical and law enforcement personnel during emergencies. But, one of the main parameters in pill identification is the shape of the pill. An Adaptable-Ring approach describes a novel technique to accurately detect the …

Dependability Analysis And Recovery Support For Smart Grids, Isam Abdulmunem Alobaidi

Masters Theses

"The increasing scale and complexity of power grids exacerbate concerns about failure propagation. A single contingency, such as outage of a transmission line due to overload or weather-related damage, can cause cascading failures that manifest as blackouts. One objective of smart grids is to reduce the likelihood of cascading failure through the use of power electronics devices that can prevent, isolate, and mitigate the effects of faults. Given that these devices are themselves prone to failure, we seek to quantify the effects of their use on dependability attributes of smart grid. This thesis articulates analytical methods for analyzing two dependability …

A Decision Support Simulation Model For Bed Management In Healthcare, Raja A. Baru

Masters Theses

"In order to provide access to care in a timely manner, it is necessary to effectively manage the allocation of limited resources such as beds. Bed management is key to the effective delivery of high-quality and low-cost healthcare. An efficient utilization of beds requires a detailed understanding of the hospital's operational behavior. It is necessary to understand the behavior of a hospital in order to make necessary adjustments to its resources, and policies, which can improve patient's access to care. The aim of this research was to develop a discrete event simulation to assist in planning and staff scheduling decisions. …

Whose Beer Is It, Anyway?: An Examination Of The Constraints Of Organizational Legitimacy With The Craft Beer Industry, Audra E. Clodfelter

Masters Theses

Previous research on organizational legitimacy has determined that legitimacy is necessary for organizational survival, but also places a constraint upon the organization's actions. This project examines the roles of authenticity and social identity as constraints of legitimacy in the craft beer through a case study of four craft breweries that merged with Anheuser-Busch InBev. This study examined the social media communication of four craft breweries prior to their merger announcement as well as the reactions from fans after the announcements were made. Analysis revealed that the breweries used social media to emphasize their authenticity prior to the merger announcement and …

From Prairienet To The Cdi: Writing The History, Sally Van Der Graaff

Masters Theses

This paper, the companion to the written work I completed for the Center for Digital Inclusion (CDI) at the University of Illinois, will provide the background of the project and describe my involvement in its production. The project itself is a comprehensive history of the center's work in the field of information access, with particular emphasis on the digital divide. Insofar as gaining an understanding of digital divide theory was a necessary precursor to researching and writing this history, the companion paper will begin with an exploration of the literature on the digital divide debate and proceed with an analysis …

Political Intolerance In The 21st Century: The Role Of Ideology And Emotion In Determining Intolerant Judgments, Matthew Cain

Masters Theses

Decades of research in Social Psychology have demonstrated that political intolerance is not displayed equally with respect to ideology. In particular, conservatives and those with right-wing beliefs are much more likely to display intolerant judgments than those with liberal or left-wing beliefs. This "prejudice gap" has been found to be so ubiquitous that it is now the conventional wisdom regarding the relationship between ideology and intolerance. However, a small, but growing literature challenges this presumed ideological asymmetry and has instead found that liberals and conservatives display intolerance under certain circumstances. Synthesizing the recent research showing ideological symmetry in intolerance judgments, …

From Trade Deficit In Goods To Trade Surplus In Services: An Eclectic And Extended Gravity Model Approach In Analyzing The Determinants Of Service Trade Of The United States, Tofayel Ahmmad

Masters Theses

This paper employs an eclectic and extended gravity model of trade to assess the most important determinants of real export and import of services of the United States by analyzing US service trade with its 33 partner countries for 15 years. Distance affects US real export of services negatively, but has no influence on US real import of services. A devaluation of the US dollar increases service export of the United States. We find a positive relationship between US goods trade and US service exports. US outward FDI has a positive impact on US real export of services, but has …

Student Perceptions Of Academic Advisor Effectiveness And Student Success: Factors That Matter, Madeline R. Owens

Masters Theses

This study examined students' perceptions of academic advisor effectiveness as well as perceptions of the importance of academic advising functions, in relation to the contribution these constructs have on student success as measured by GPA and continuous semester enrollment. Participants included students 18 years or older who were enrolled at the institution of interest at the time of data collection. Quantitative causal-comparative and correlational designs were utilized. A 41-item instrument was adapted with permission from Smith and Allen (2006) to measure students' perceptions of advisor effectiveness and importance of the academic advising functions. Findings indicated that a change in students' …

Construct Validity Of The Learning Behaviors Scale And The Academic Competence Evaluation Scales, Taryn L. Smith

Masters Theses

This research examined the convergent and discriminant validity of the Academic Competence Evaluation Scales (ACES; DiPerna & Elliott, 2000) and the Learning Behaviors Scale (LBS; McDermott, Green, Francis, & Stott, 2001). The Adjustment Scales for Children and Adolescents (ASCA; McDermott, Stott, & Marston, 1993) was compared with the ACES and LBS to examine discriminant validity. Pearson product moment correlations were obtained to examine convergent and discriminant validity. Paired samples t-tests were conducted on the ACES and LBS total and subscale scores to compare the mean scores. The ACES Academic Enabler (ACES-AE) total score was significantly, positively correlated with the …

Examination Of Teachers' Perceptions Of The Importance Of Academic Enablers, Feasibility Of Academic Enabler Instruction, And Academic Enabler Instruction Practices, Amy M. Whitcomb

Masters Theses

Academic enablers are beliefs, attitudes, and behaviors that help an individual to succeed academically. The four academic enablers identified by DiPerna and Elliott (2000) and measured by the Academic Competence Evaluation Scales (DiPerna & Elliott, 2000) include engagement, interpersonal skills, motivation, and study skills. A wealth of literature has detailed the critical importance of academic enablers to academic success, as well as identified specific ways which teachers can instruct students in development of these skills. While DiPerna and Elliott (2000) note that teachers' perceptions of the importance of these skills and related behaviors can assist in informing intervention for individual …

Same-Sex Peer Influence On Female Undergraduate Body Image Perception, Caitlyn Buchanan

Masters Theses

Regardless of age, race, or socioeconomic class, women throughout western cultures are well documented for having body image related insecurities. These insecurities can be the result of pressure to look and behave a certain way from a variety of sources including media and peers. This study explored the role that same-sex peers play in undergraduate women's perception of body image. Four undergraduate women at a public, Midwestern university who lived within campus housing were interviewed. Results of the study showed that same-sex peers did not play a significant role in the women's perception of body image. The results of this …

Written Discourse Performance After Blast Injury, Brittany M. Loomis

Masters Theses

A blast injury (BI) is caused by a wave from a bomb which damages organs, specifically the brain. Once soldiers/veterans have sustained a BI, they will most likely present with a cognitive-communication deficit resulting from the traumatic brain injury. Language related symptoms are most apparent in written language skills due to the high level of cognitive function required for writing. This study investigated written discourse skills following a BI. Written discourse samples were collected from four participants and four controls. A description of the Butcher Picture from the Aphasia Diagnostic Profile was analyzed for productivity, efficiency, and local and global …

Gendered Pathways To Office For Members Of The 112th U.S. House Of Representatives, Samantha Sarich

Masters Theses

Research both asserts that there is a particular path through careers in either business or law that many political candidates take to Congress and that female candidates do not always follow this standard path. Female candidates have been found to emerge from a wider array of experiences outside of business and law. Differences in pathways male and female candidates take to public office have been widely studied, yet little attention has been focused on whether or not female candidates having experience serving on the board of a non-profit organizations can be a part of a viable alternate pathway to public …

The Impact Of Nutrition Education On Fruit And Vegetable Consumption Of Elementary School Students, Constance Evans Herriott

Masters Theses

The purpose of this study was to determine the effect of nutrition education on the fruit and vegetable consumption of third grade students. This was in an effort to determine whether nutrition education played a role in the consumption of fruits and vegetables because current intakes are very low. This quasi-experimental study consisted of a relatively small convenience sample at a rural elementary school. For this study, thirty-minute nutrition education lessons were delivered for four consecutive weeks to the experimental group. In order to assess the impact of the lessons, fruit and vegetable plate waste were gauged prior to and …

Comparison Of Agency And Volunteer Stream Assessments Using Macroinvertebrate Assemblages, David William Petry

Masters Theses

Professional stream assessments can be both time and cost intensive. Many states have developed citizen science programs in an effort to provide reliable data to supplement agency assessments. To test how two of these protocols and their conclusions compare, I sampled 16 sites in seven streams within east central Illinois using techniques from two different organizations: Illinois RiverWatch and Illinois Environmental Protection Agency. Overall, spring RiverWatch, fall RiverWatch, and fall IEPA sampling all produced unique results and conclusions. Compared to fall IEPA assessments, spring RiverWatch was affected by differences in both sampling protocol and season. RiverWatch sampling in fall reduced …

Breaking The Chains Of Trafficking: An Educational Program, Amanda K. Feder

Masters Theses

With popular television shows and films focusing on the issue of sex trafficking, many discursive constructions of the issue allow for a "script" to be followed and replicated in many anti-trafficking discourses. Ultimately, the constructions of the issue become a basis of understanding on sex trafficking, which can consequentially limit the availability and accuracy of anti-trafficking resources. From examining popular discourses and their construction of sex trafficking on a global and U.S. scale, to creating an educational program designed for college-level courses on the realities of trafficking, this project focuses on de-bunking the myths of sex trafficking on a local …

Dysfunctional Text Messaging As Related To Social Anxiety, Self-Esteem, Emotional Intelligence, And Attentional Control, Sean E. Nelson

Masters Theses

Despite the widespread and increasing use and popularity of text messaging since the mid 1990's, the extent of the psychological literature regarding this technology is scarce. Chief amongst these underexplored areas is the relationship that text messaging, as a mode of Nonverbal Asynchronous Communication, has with Verbal Synchronous Communication abilities. For this study, these abilities have been operationalized as social anxiety, self-esteem, emotional intelligence, and attentional control. The available research implies a relationship between these concepts. Despite mostly theoretical links in the literature, no study had attempted to measure many of these relationships empirically. This study examined the relationship between …

Contextual Conditions Related To The Undergraduate Experience And The Nature Of Alumni Involvement: A Qualitative Study, Kasey G. Evans

Masters Theses

The researcher used qualitative methodology to analyze the perspectives of 5 alumni of a mid-sized Midwestern institution regarding their experiences as an undergraduate at the institution and the context of their current relationship with their alma mater. Overall, participants placed a value on giving back to the organizations and groups that they were most involved with as an undergraduate. The participants do not currently give to the institution financially but would like to in the future. The study suggests that undergraduate context is vital to future involvement with the institution.

The Balancing Act Between Student Lnvolvement And Academic Performance, Rocken Roll

Masters Theses

A qualitative methodology was utilized to examine student leaders' ability to balance the responsibilities that come with being involved in extracurricular activities and their academic coursework. Through conducting one on one interviews with five participants who are current student leaders at the research site, it was found that student leaders acknowledge that time management and organizational strategies are instrumental to successfully managing their dual roles. However, not all participants were actually utilizing time management and organizational strategies in their day-to-day lives. Participants discussed motivations for involvement in extracurricular activities, positive and negative impacts of their involvement, definitions of success, time …

Resident Assistant Training And Students With High Functioning Autism, Tyler Fisher

Masters Theses

Utilizing qualitative methodology, Resident Assistants' perceptions were examined with regards to the training they receive for identifying and assisting High Functioning Autistic Students. Current Resident Assistants were interviewed and themes were developed. RA's expressed dissatisfaction with current training concerning the characteristics of this population. Specifically, participants shared the need for additional training on identifying HFA students and the referral process to disability services. Lastly, participants shared feeling strong support from supervisors; however, lack the knowledge and confidence to effectively support these students.