Digital Commons Network^™

Optimal Design Of Discrete-Time Delta Sigma Modulators, Matthew Edward Jackson

UNLV Theses, Dissertations, Professional Papers, and Capstones

In this thesis, optimal signal transfer functions (STFs) and noise transfer functions (NTFs) for discrete time delta sigma (ΔΣ) modulators are determined. For a given oversampling rate (OSR), these STFs and NTFs are optimized with respect to a weighted combination of the ΔΣ modulator's signal-to-noise ratio (SNR) and dynamic range (DR). This optimization problem is solved using a novel hybrid orthogonal genetic (HOG) algorithm that uses customized genetic operators to improve algorithm performance and accuracy when applied to multimodal, non-differentiable performance surfaces. To generate optimal system functions, the HOG algorithm is implemented as a constrained global optimizer to minimize cost …

Puebloan Plain-Weave Pointed/Rounded-Toe Sandals, David Toy Yoder

UNLV Theses, Dissertations, Professional Papers, and Capstones

An assemblage of 226 Puebloan pointed/rounded-toe sandals from sites throughout the northern Southwest was examined to answer the following questions: how were these sandals constructed, when where they used, and where were they distributed. The answers to these questions were then used to investigate cultural boundaries, communities of practice, and interaction among the Anasazi. Methods of analysis included a technical analysis, soft X-ray radiography, microscopic fiber identification, spatial analysis, AMS radiocarbon dating, and experimental reconstruction.

Based on these analyses it appears that pointed/rounded-toe sandals were used as early as A.D. 631 to as late as A.D. 1178. Spatially, this sandal …

Mineralogy And Micromorphology Of An Atacama Desert Soil, Chile: A Model For Hyperarid Pedogenesis, Michael S. Howell

UNLV Theses, Dissertations, Professional Papers, and Capstones

The Atacama Desert is the oldest and driest desert on Earth. Hyperarid soils in this desert are dominated by rare (or exclusive) salt minerals and assemblages. Previous research details salt origins and abundance, however pedogenic processes involved in salt distribution are not adequately explained. Therefore, the main goal of this investigation was to identify and document evidence for hyperarid pedogenesis (via salt mineralogy and soil micromorphology) at a field site, Oficina Ercilla, located ~80 km northeast of Antofagasta, Chile within the Central Depression and hyperarid core of the Atacama Desert. This study presents an interpretational model for hyperarid pedogenesis, which …

The Underrepresentation Of Women In Interscholastic Sport Leadership: A Qualitative Study On The Effects Of Role Incongruity, Dana Massengale

UNLV Theses, Dissertations, Professional Papers, and Capstones

The purpose of this study was to investigate the underrepresentation of women in interscholastic sport leadership positions by analyzing perceptions of state association administrators and athletic directors of the function, if any, that role congruity theory plays in the underrepresentation women. Previous research has examined potential causes for this underrepresentation but no previous study had examined this phenomenon from a prejudice toward women in a leadership role perspective. Data were collected through indepth, semi-structured interviews involving nine women leaders in interscholastic athletics. The criteria for participation placed them into one of three categories: (1) participants who were currently working as …

Principals' And Teachers' Perceptions Of Teacher Supervision, Rebecca Margaret Minnear-Peplinski

UNLV Theses, Dissertations, Professional Papers, and Capstones

The purpose of this study was twofold: to determine the extent to which professional and bureaucratic approaches are used in schools around the country and to describe to what extent the elements of instructional supervision, professional development, and evaluation are used to supervise teachers. Survey research was used to ascertain the use of these methods.

Data collected indicated that professionalism, instructional supervision, and professional development techniques were the dominant approaches to supervision as indicated by administrators and teachers. When disaggregated by elementary and secondary schools and the degree held by the principal, groups were similar in overall use of professionalism, …

Efficient Clustering Techniques For Managing Large Datasets, Vasanth Nemala

UNLV Theses, Dissertations, Professional Papers, and Capstones

The result set produced by a search engine in response to the user query is very large. It is typically the responsibility of the user to browse the result set to identify relevant documents. Many tools have been developed to assist the user to identify the most relevant documents. One such a tool is clustering technique. In this method, the closely related documents are grouped based on their contents. Hence if a document turns out to be relevant, so are the rest of the documents in the cluster. So it would be easy for a user to sift through the …

Midlife Career Change And Women: A Phenomenological Examination Of The Process Of Change, Terry Ann Bahr

UNLV Theses, Dissertations, Professional Papers, and Capstones

The purpose of this phenomenological study was to examine how fourteen women between the ages of thirty-five and fifty years old experienced the essence of making a midlife career change. Of further interest were the unique dimensions of each participant in their experience of this internal process of change. This study was an exploratory and inductive search for common themes and differences that these women shared throughout their experience of making a midlife career change.

Semi-structured interviews were conducted and thematic analysis was made by the construction of profile narratives for each participant. Five emerging themes were extracted from the …

Implications For Nursing Practice: Delivering The Folic Acid Message, Kimberly Townsend Little

UNLV Theses, Dissertations, Professional Papers, and Capstones

In 1995, North Carolina (NC) had one of the highest prevalence rates of neural tube defects (NTDs) in the United States. Since the NC Folic Acid Council began focusing their efforts on educating women of childbearing age regarding NTDs in 1994, the prevalence of NTDs has declined overall by 40%; however, NTD prevalence among Hispanics in NC continues to be double the rate of non-Hispanics. Research has found daily consumption of a multivitamin with folic acid significantly decreases NTDs. Healthy People 2010 include in their objectives the need to increase folic acid consumption in women and reduce the NTD rates. …

Filipino Physician-Turned Nurses: A Phenomenological Study, Victor Rey Cui Vapor

UNLV Theses, Dissertations, Professional Papers, and Capstones

Foreign nurses have augmented the United States nursing workforce. The Philippines has remained the world's leading exporter of nurses, including the United States. More recently, a new phenomenon has emerged involving Filipino physicians who went back to school to take up nursing in the Philippines in order to migrate to foreign countries to work as nurses. The purpose of this study was to describe and to interpret the lived experiences of Filipino physician-turned nurses in the United States. Phenomenology was used as research design, with data obtained from a purposive sample of eight (8) self-identified physician-turned nurses in Las Vegas, …

Focus Of Attention On Movement Technique Acquisition Of A Pilates Roll-Up, Kristine M. Bragg

UNLV Theses, Dissertations, Professional Papers, and Capstones

Focus of attention manipulation has been shown to have an effect on learning and performance of movement tasks. The purpose of this experiment was to determine whether inducing an external or internal focus of attention while learning a Pilates roll-up had an effect on movement technique acquisition. Movement form, movement time, and distance reached served as dependent variables. Participants (n=22) were assigned to either an external or internal focus group and verbally instructed through 2 sets of 6 repetitions of the roll-up per day over two practice days. A retention test on Day 3 consisting of 2 sets of 6 …

Experimental And Numerical Study Of A Proton Exchange Membrane Electrolyzer For Hydrogen Production, Sachin S. Deshmukh

UNLV Theses, Dissertations, Professional Papers, and Capstones

Hydrogen as a fuel source has received attention from researchers globally due to its potential to replace fossil based fuels for energy production. Research is being performed on hydrogen production, storage and utilization methods to make its use economically feasible relative to current energy sources. The PEM electrolyzer is used to produce hydrogen and oxygen using water and electricity. Focus of our study is to provide a benchmark experiment and numerical model of a single cell electrolyzer that can assist in improving the current state of understanding of this system. Parametric analysis of an experimental cell was performed to understand …

The Effectiveness And Adoption Of Market-Based State Health Care Expansion Programs, Nathan Gregory Myers

UNLV Theses, Dissertations, Professional Papers, and Capstones

Market-based state health expansion programs are alternatives to government programs like Medicaid and SCHIP which also seek to expand access to health insurance for uninsured populations. These programs either utilize the private health insurance market or function according to market principles. The market-based policies at issue in this research are state high-risk health insurance pools, limited benefit plans, group purchasing arrangements, reinsurance programs, and Health Insurance Flexibility and Accountability waivers. This research addresses two separate but related research questions: (1) Do these market-based programs provide general economic and social benefits for the citizens of a state? (2) What role does …

Islanded Operation Of A Distribution Feeder With Distributed Generation, Chandu Venu

UNLV Theses, Dissertations, Professional Papers, and Capstones

A distribution system that is equipped with distributed generators, such as roof-mounted photovoltaic systems, can operate as a microgrid (i.e., separated from the grid) under some specific conditions. A key feature of a microgrid is its ability to separate and isolate itself from the utility seamlessly with little or no disruption to the loads within the microgrid. Then, when the utility grid returns to normal, the microgrid automatically resynchronizes and reconnects itself to the grid, in an equally seamless manner. This thesis addresses the conditions necessary for proper microgrid operation: these include local generation-load mismatch, local energy storage, load switching, …

Analytical Method Development For Determination Of Volatile Organic Compounds In Calcareous Desert Soil, Mary F. Turner

UNLV Theses, Dissertations, Professional Papers, and Capstones

Soil sample preservation for volatile organic compound analysis generally requires short sample holding times or preservation of the sample's chemical constituents with sodium bisulfate (NaHSO 4 ). Calcareous soils cannot be preserved using NaHSO4 because effervescence will promote the loss of analytes, and short holding times before analysis are not practical for remote sampling locations. An experimental approach was developed for determination of volatile organic compounds (VOCs) in soil that utilizes solid sorbents for sample preservation and solid-phase microextraction (SPME) sample preparation technique coupled with gas chromatography/mass spectrometry (GC/MS) for analysis. Solid sorbents are used to sequester readily extractable (vapor …

The Aadere Model Of Progression In The Hospitality And Tourism Industry: An Empirical Study Of High-Salaried Black Managers, Ivan Benjamin Turnipseed

UNLV Theses, Dissertations, Professional Papers, and Capstones

Applying grounded theory methodology and method, this qualitative study uncovers and presents a rich, theoretically expressed understanding of the experience of salaried Black hospitality and tourism professionals who earn at least $100,000 annually. A 13-step customized research process featuring a novel literature review method, which utilizes researcher pre-data collection assumptions as a framework for conceptualizing and processing an unwieldy literature, enhancing post-data analysis, and developing research conclusions, is introduced.

Twenty loosely structured, open-ended, and in-depth interviews (12 male) are the singular data collection tool. An exhaustive analysis of participant transcripts resulted in 5,337 co ding in cident s , or …

Road To The Green Seal, Milos Cerovic

UNLV Theses, Dissertations, Professional Papers, and Capstones

Green Seal is one of the most recognized non profit organizations that work closely with companies from all over the country to provide certification of environmentally friendly products used by employees. There are many reasons for product certification process. The most obvious one is to preserve the environment and energy efficiency. Another important reason is to reduce the cost and increase the profit by using products with higher durability and less expensive packaging. Of equal importance is participation in green initiatives which allows hotels and other organizations to capture additional businesses, media exposure etc. InterContinental Chicago is the largest and …

Increasing The Recycling Rate In Clark County, Nevada, Emerald Laija

UNLV Theses, Dissertations, Professional Papers, and Capstones

The purpose of this study was to identify and evaluate policies that could increase the amount of municipal solid waste recycled in Clark County, Nevada. Clark County has not met the Nevada State goal of a 25% recycling rate since it was established by the Nevada Legislature in 1991. Using the system dynamics problem solving approach, a model for Clark County was adapted from a model developed by Stave (2008) to test policy options. There was no feedback in the model due to the long lifespan of the landfill servicing Clark County and the relatively shorter time horizon of the …

The Environmental And Economic Benefits Of Highway Access Management: A Multivariate Analysis Using System Dynamics, Dan Andersen

UNLV Theses, Dissertations, Professional Papers, and Capstones

Better management of highway operations can be achieved, in part, by controlling vehicular access to adjacent properties and cross streets. This tactic, referred to as access management, has proven safety and operational benefits. However, doubts remain regarding its environmental and economic benefits.

I hypothesize that one environmental indicator, carbon emissions, will decrease with proper access management. Controlling access increases the speed at which vehicles travel, improving fuel efficiency and reducing carbon emissions. My hypothesis relative to financial impacts is that access management will neither help nor harm businesses. Controlling access can reduce travel time which has the effect of increasing …

An Observational Tool For Measuring The Dealer's Emotional Labor In A Casino, Alfred Sukwon Jang

UNLV Theses, Dissertations, Professional Papers, and Capstones

The hotel industry has been interested in friendliness as a means of improving the relationships with customers. Upon how to operationally measure the employee’s friendliness, emerging studies have mentioned emotional labor at work. This study developed an observational tool for measuring the dealer's emotional labor in a casino by observing the smiling, eye contact, collecting in a gentle manner, greeting, thanking, and apologizing.

The Relationship Between High Risk Athletes Risk Perception Of Adventurous Activities, Their Travel Destinations And Their Vacation Travel Patterns, Tanir Magen

UNLV Theses, Dissertations, Professional Papers, and Capstones

Adventure tourism is a growing market segment in the US; the decision to participate in adventurous activities and the selection of risky destinations while on vacation involves ones risk perception about the physical risks that can lead to fatal results from these activities. Existing literature suggest that risk perception is a determinate in choosing a leisure activity and destination while on vacation and that level of tolerance to uncertainty can determine travel behavior (Floyd & Gibson, 2004; Fuchs & Reichel, 2006; Hofstede, 2001; Iso- Ahola, 1980, 1982; Money & Crotts, 2003; Reisinger & Mavondo, 2005). People who have high tolerance …

Camping: A Positive Developmental Context For Youth With Disabilities/Serious Illness, Christopher T. Troxell

UNLV Theses, Dissertations, Professional Papers, and Capstones

The paper will examine how elements of youth development can enhance the camp experience, so that new camps for youth with disabilities and/or serious illness, such as Flying Horse Farms, can start with a solid knowledge base of what works and why it works. Also, even though the paper is geared toward these specific types of camps, part of its recommendation could be modified to fit the purpose of any camp.

Taxonomy Of Knowedge Management Research In Hospitality And Tourism, Henner Nehles

UNLV Theses, Dissertations, Professional Papers, and Capstones

The hospitality industry is operating in an ever increasing knowledge-based economy, where hotels have to increase customer satisfaction and retention levels, lower employees turnover rates and operating expenses, maximize profits and strive to gain a sustainable competitive advantage. “Knowledge management caters to the critical issues of organizational adaptation, survival, and competence in the face of increasingly discontinuous environmental change. Essentially, it embodies organizational processes that seek synergistic combinations of data and information processing capacity of information technologies, and the creative and innovative capacity of human beings” (Civi, 2000, p.166). Knowledge Management (KM) is not a new concept. It has its …

Managing Cultural Diversity In Hospitality Industry, Yi Gong

UNLV Theses, Dissertations, Professional Papers, and Capstones

Cultural diversity has become a major issue in the hospitality industry of the United States. This paper focuses on analyzing the change faces and current status of the cultural diversity in the hospitality workplaces, discussing the opportunities, benefits and challenges from the culturally diverse workforce, and providing practical recommendations that might help human resource managers to successfully dear with cultural diversity issues. Based on the analysis of cultural diversity, this paper creates a cultural diversity training module for a graduate human resource course or a hospitality company training program that aims at facilitating trainees to increase cultural diversity awareness and …

Rebranding: A Case Study Of A Business Hotel In Singapore, Guat Loo Ooi

UNLV Theses, Dissertations, Professional Papers, and Capstones

This paper examined the process of service rebranding through various studies of corporate rebranding and service branding. This paper used exploratory case study to gain insight of an actual service rebranding of a business luxury class hotel, Royal Plaza on Scotts. Information from in-dept interviews with the Marketing and Brand Director was used to understand the various elements of the service rebranding process. The study showed that the actual service brand revitalisation of the hotel involved a combination of elements in the corporate rebranding and service branding processes. The study showed that the process of making changes to service brand …

Surface Water Interaction With The Flood Plain In The Lower Virgin River, Clark County, Nevada, Jeffrie L. Pompeo

UNLV Theses, Dissertations, Professional Papers, and Capstones

Development of existing surface water rights on the Virgin River would decrease Southern Nevada's dependency on the Colorado River. Three monitoring sites were established to examine the relationship between Virgin River surface water flows and the floodplain aquifer. Automated water level measuring devices were installed in piezometers and wells to continuously track water levels and flow direction. Pump tests were conducted to establish the hydraulic parameters of the floodplain aquifer. Water chemistry data was analyzed to help determine the correlation between the floodplain aquifer and Virgin River water. Precipitation, recharge, streamflow and ET estimates were used to discuss water budgets. …

Modeling Natural Resources Scarcity And Proverty Effects On Fertility In Honduras, Nepal, And Tanzania, Ayoub Shaban Ayoub

UNLV Theses, Dissertations, Professional Papers, and Capstones

This dissertation examines whether the vicious circle theory applies in three developing countries characterized by high population growth. According to the vicious circle theory, natural resource scarcity coupled with poverty leads to population growth via positive effects on fertility particularly in rural areas of developing countries. Population growth then leads to a further increase in natural resource scarcity, creating a "feedback loop." This is the first study to use micro-level data to test and control for endogeneity using a two-stage Probit model (IVPROBIT). The existing literature has largely failed to address endogeneity in the relationship between natural resource scarcity and …

Proposing Additional Questions To Understand A Destination’S Image And Its Relationship With A Business Travelers’ Socio-Economic And Demographic Profile: Specifically, The Case Of Las Vegas, Yohan Lee

UNLV Theses, Dissertations, Professional Papers, and Capstones

Based on reviewed results of visitor profile reports from Las Vegas Convention and Visitors Authority (LVCVA) and other related literature, this study concentrated on developing additional and helpful questions to measure Las Vegas business travelers’ leisure needs and their perceived image of LVCVA. These questions mainly covered the areas, which were not covered by LVCVA survey questionnaire. Both quantitative and qualitative methods were utilized to create these additional questions. Thirty seven leisure attributes were used to measure business travelers’ general travel experiences. Thirty eight leisure attributes were used to measure business travelers’ perceived overall image of Las Vegas. Three open-ended …

Customer Loyalty Program Integration In A Restaurant: Pos System Tracking, Raegan D. Ashcraft

UNLV Theses, Dissertations, Professional Papers, and Capstones

Restaurants today have a high failure rate for several reasons. Heavy competition is one reason that leads to the necessity of customer loyalty. Loyal customers represent not only “stable revenues”, but they are also “six times less expensive to plan marketing. Restaurants are challenged with applying the personability to each individual customer that enters the front door in order to gain a return visit. This can be attained through “a greeting by name or simply a reference to a favorite dessert” (Liddle, 1999 ). Currently there are numerous customer loyalty programs implemented in other areas of hospitality: gaming and hotel …

Developing A Comprehensive Training Guide For Dealers In The Gaming Sector Of The Hospitality Industry In Las Vegas, David Lee

UNLV Theses, Dissertations, Professional Papers, and Capstones

Given that repeat business is at the core of profitable operations, particularly in the service industry, the purpose of this paper is to develop a comprehensive training guide for dealers in the gaming sector of the hospitality industry in Las Vegas. The comprehensive training guide will focus on customer service satisfaction to increase loyalty and add value to the Service Profit Chain (SPC). The efforts to develop and then implement this comprehensive training manual is to produce higher rates of repeat business, reflected in higher returns and overall profits. Therefore upon implementation, this comprehensive training manual will be the cornerstone …

An Overview Of Change Management In The Hospitality Industry, Jennifer Lee

UNLV Theses, Dissertations, Professional Papers, and Capstones

An organization operates based on shifting circumstances, both internal and external. Such a dynamic environment demands adaptability within the organization and consequently, capabilities to absorb inevitable change. Such focus requires the commitment of an organization’s staff. In the hospitality industry, this is especially so, considering the labor-intensive operations that respond to the volatile sales and the seasonality of a perishable good. This paper considers critical issues in change management that are relevant to the hospitality industry. Research studies in change management over the last several years will be identified and analyzed. In addition, case studies which support common findings will …