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Development and saw device implementation of a new weighted stepped chirp code signal for direct sequence spread spectrum communications systems
Title
Development and saw device implementation of a new weighted stepped chirp code signal for direct sequence spread spectrum communications systems.
Creator
Carter, Scott Edward, Malocha, Donald C., Engineering
Abstract / Description
University of Central Florida College of Engineering Thesis; This work introduces the new weighted stepped chirp code signal for direct sequence spread spectrum (DS/SS) communications systems. This code signal uses the truncated cosine series functions as the chip functions. This code signal is the result of discretizing a continuous wave (CW) chirp which results in enhanced performance versus a pseudonoise (PN) cose and equivalent performance and easier implementation than a CW chirp. This...
Show moreUniversity of Central Florida College of Engineering Thesis; This work introduces the new weighted stepped chirp code signal for direct sequence spread spectrum (DS/SS) communications systems. This code signal uses the truncated cosine series functions as the chip functions. This code signal is the result of discretizing a continuous wave (CW) chirp which results in enhanced performance versus a pseudonoise (PN) cose and equivalent performance and easier implementation than a CW chirp. This code signal will be shown to possess improved compression ratio (CR), peak sidelobe level (PSL), integrated sidelobe level (ISL), and bit error rate (BER) when compared to a PN code of identical code length and chip length. It also will be shown to have a similar CR, PSL, ISL, and loss in processing gain (LPG) when compared to a CW chirp with identical pulse length and frequency deviation. The code signal is implemented on surface acoustic wave (SAW) devices which can be used as the code signal generator at the transmitter and the correlator at the receiver in a DS/SS communication system. SAW design considerations for the weighted stepped chirp signal are discussed. Experimental data is presented and compared to the predicted CR, PSL, ISL, LPG, and BER.
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Date Issued
1998
Identifier
CFR0008153, ucf:52944
Format
Document (PDF)
PURL
http://purl.flvc.org/ucf/fd/CFR0008153
Finite impulse response utilizing the principles of superposition
Title
Finite impulse response utilizing the principles of superposition.
Creator
Carter, Scott Edward, Malocha, Donald C., Engineering
Abstract / Description
University of Central Florida College of Engineering Thesis; Window functions have been greatly utilized in the synthesis of finite impulse response (FIR) filters implemented using surface acoustic wave (SAW) devices. The critical parameter in any FIR design in the impulse response length, which must be optimized for the given design specifications in order to reduce the size of each device. To this end, many design algorithms have been introduced such as Remez exchange, linear programming,...
Show moreUniversity of Central Florida College of Engineering Thesis; Window functions have been greatly utilized in the synthesis of finite impulse response (FIR) filters implemented using surface acoustic wave (SAW) devices. The critical parameter in any FIR design in the impulse response length, which must be optimized for the given design specifications in order to reduce the size of each device. To this end, many design algorithms have been introduced such as Remez exchange, linear programming, and least mean squares. A new algorithm has been derived which is efficient and accurate for the design of arbitrary filter specifications requiring less computations than the current algorithms. The FIR design is applicaable to general SAW filter design and allows two weighted transducers to be designed in a near optimal method without the need to perform zero aplitting of de-convolution. The thesis first provides the definition of the window functions used for the design process. Then the overview of the design process is discussed using a flowchart of the modeling program for designing and FIR without tranducer separation and sample simulation is presented. Next, the effects of monotonically increasing sidelobes on the transition bandwidth are discussed. This is followed by a discussion of the addition of arbitary phase to the filter design requirements. Next, the separation of the response into a two transducer design utilizing the two window function series is explained. Finally, the results are discussed and compared with other design techniques.
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Date Issued
1995
Identifier
CFR0000186, ucf:52937
Format
Document (PDF)
PURL
http://purl.flvc.org/ucf/fd/CFR0000186
DIGITAL RESEARCH CYCLES: HOW ATTITUDES TOWARD CONTENT, CULTURE AND TECHNOLOGY AFFECT WEB DEVELOPMENT.
Title
DIGITAL RESEARCH CYCLES: HOW ATTITUDES TOWARD CONTENT, CULTURE AND TECHNOLOGY AFFECT WEB DEVELOPMENT.
Creator
Scott, Edward, Saper, Craig, University of Central Florida
Abstract / Description
It has been estimated that one third of the world's population does not have access to "adequate" health care. Some 1.6 billion people live in countries experiencing "concentrated" acquired immune deficiency syndrome (AIDS) epidemics. Many countries in Africa -- and other low-income countries -- are in dire need of help providing adequate health care services to their citizens. They require more hands-on care from Western health workers -- and training so more African health workers can...
Show moreIt has been estimated that one third of the world's population does not have access to "adequate" health care. Some 1.6 billion people live in countries experiencing "concentrated" acquired immune deficiency syndrome (AIDS) epidemics. Many countries in Africa -- and other low-income countries -- are in dire need of help providing adequate health care services to their citizens. They require more hands-on care from Western health workers -- and training so more African health workers can eventually care for their own citizens. But these countries also need assistance acquiring and implementing both texts -- the body of medical information potentially available to them -- and technology -- the means by which that information can be conveyed. This dissertation looks at these issues and others from a multi-faceted approach. It combines a survey of the developers of Web sites designed for use by health workers in low-income countries and a proposal for a novel approach to communication theory, which could help improve health communication and other social marketing practices. It also includes an extensive review of literature regarding a number of topics related to these issues. To improve healthcare services in low-income countries, several things should occur. First, more health workers -- and others -- could visit African countries and other places to provide free, hands-on medical care, as this researcher's group did in Uganda. Such trips are ideal occasions for studying the cultural differences between "mzungu" (white man) and the Ugandan people. A number of useful medical texts have been written for health workers in low-income countries. Others will be published as new health information becomes available. But on what medium will they be published? Computers? Personal digital assistants? During the past 10 years the Internet became an ideal venue for conveying information. Unfortunately, people in target countries such as Uganda encounter cultural differences when such new technologies are diffused. This dissertation looks at cultural and technological difficulties encountered by people in low-income countries who attempt to diffuse information and communication technologies (ICT). Once a technology has been successfully adopted, someone will look for ways to use it to help others. There are hundreds of sites on the Internet -- built by Web developers in Western countries -- that are designed for use by health workers in low-income countries. However, these Web developers also experience cultural and technological differences, based on their knowledge of and attitudes toward best practices in their field. This research includes a survey of Web developers which determined their attitudes toward best practices in their field and tested this researcher's hypothesis that there is no significant difference among the developers' attitudes toward the content on their sites, their audience's cultural needs and the various technological needs their audience has. It was found that the Web developers agree with 17 of 18 perceived best practices and that there is a significant difference between Web developers' attitudes toward their audience's technological needs and their attitudes toward quality content and the audience's cultural needs. Creation of the survey herein resulted in this researcher generating a new way of thinking about communication theory -- called digital research cycles. The survey was based on a review of literature and is rooted in the belief that any successful communication of a computer-mediated message in the information age is a behavior which is influenced by the senders' and receivers' attitudes and knowledge about textual style, the audience, technology and the subject matter to which the message pertains.
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Date Issued
2009
Identifier
CFE0002637, ucf:48218
Format
Document (PDF)
PURL
http://purl.flvc.org/ucf/fd/CFE0002637
Neither Teacher nor Scholar: Identity and Agency in a Graduate Teacher's Life
Title
Neither Teacher nor Scholar: Identity and Agency in a Graduate Teacher's Life.
Creator
Pierson, Caitlin, Wheeler, Stephanie, Edwards, Dustin, Scott, Blake, University of Central Florida
Abstract / Description
This thesis examines how graduate student teachers (GTA's) employ agency in order to establish and perform professional identities. Understanding agency as interactional, performative, and acting in a way (")unintended by power(") (Butler, 1997, p. 15), this thesis examines the spatial practices and performances of a graduate student teacher through a mixed methods approach combining video recordings with autoethnography.This project begins by using Lefebvre's (1991) social imaginary to...
Show moreThis thesis examines how graduate student teachers (GTA's) employ agency in order to establish and perform professional identities. Understanding agency as interactional, performative, and acting in a way (")unintended by power(") (Butler, 1997, p. 15), this thesis examines the spatial practices and performances of a graduate student teacher through a mixed methods approach combining video recordings with autoethnography.This project begins by using Lefebvre's (1991) social imaginary to examine the potent arguments being made to and about GTA's from their shared office, using visual rhetorical analysis to examine how this space communicates ideas of identity and place that work at rhetorical purposes counter to the performances GTA's are employing within that space. Exploring how GTA's respond to the social imaginary within space, this thesis conducts an analysis of the tactics employed, using De Certeau (1984) as a framework. Graduate student teachers use spatial practices and performances to make do with the space and the power allotted to them; however, they employ key tactics such as altering body position and vocal tone to turn interactions with students and with each other into dynamic moments for the production of agency.Finally, this thesis argues that, while GTA's use tactics and spatial practices to negotiate the performances and spaces allotted to them, their agency is temporal and limited. Departmental investment in relationships with GTA and integrating them further into the life of the department through apprenticeship can bolster the tenuous agency of the GTA.
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Date Issued
2018
Identifier
CFE0007235, ucf:52232
Format
Document (PDF)
PURL
http://purl.flvc.org/ucf/fd/CFE0007235
Failing the Failed: A Treatise on the Need for a Research Based Pedagogical Approach to Credit Recovery
Title
Failing the Failed: A Treatise on the Need for a Research Based Pedagogical Approach to Credit Recovery.
Creator
Scott, Kelly, Boote, David, Robinson, Edward, Vitale, Thomas, Hayes, Burnice, University of Central Florida
Abstract / Description
The purpose of this dissertation in practice is to address the problem of online credit recovery. Although online enrollments have skyrocketed in recent years and all preliminary research indicates a large percentage of those enrollments are from students seeking credit recovery, much of the curriculum currently being offered is not research-based. Following a literature review focused on the history of credit recovery as well as successful current methods, we designed CRIT (Credit Recovery...
Show moreThe purpose of this dissertation in practice is to address the problem of online credit recovery. Although online enrollments have skyrocketed in recent years and all preliminary research indicates a large percentage of those enrollments are from students seeking credit recovery, much of the curriculum currently being offered is not research-based. Following a literature review focused on the history of credit recovery as well as successful current methods, we designed CRIT (Credit Recovery Instructional Treatment), a research-based approach to curriculum design for credit recovery. CRIT is a standards based curriculum relying on criterion based assessments. This approach was then applied in the creation of specific curriculum for English 4 credit recovery and as a general approach for all subjects. A step by step evaluation plan for current and proposed approaches for credit recovery was then defined. Additionally, we provide a detailed implementation strategy specific to our organization but easily retrofitted for other organizations. We focus on the organization of Florida Virtual School (FLVS), a state run K-12 virtual school run as a special school district in Florida because it is a familiar organization; however, the model and results may be generalizable for online or traditional education.
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Date Issued
2014
Identifier
CFE0005289, ucf:50565
Format
Document (PDF)
PURL
http://purl.flvc.org/ucf/fd/CFE0005289
The Relationship Between Perceived Personal Fairness, Social Fairness, Hotel Cancellation Policies and Consumer Patronage
Title
The Relationship Between Perceived Personal Fairness, Social Fairness, Hotel Cancellation Policies and Consumer Patronage.
Creator
Smith, Scott, Parsa, Haragopal, Chen, Po-Ju, Nusair, Khaldoon, Robinson, Edward, Schwartz, Zvi, University of Central Florida
Abstract / Description
The objective of the study was to examine the relationships between the concepts of personal fairness and social fairness and hotel cancellation policies. These relationships will be explored using the framework of Prospect Theory in terms of consumer patronage (willingness-to-purchase and word-of-mouth).This study includes a brief history of the development of the lodging industry in the United States from inns and taverns to the modern hotel industry that is a critical sector of the...
Show moreThe objective of the study was to examine the relationships between the concepts of personal fairness and social fairness and hotel cancellation policies. These relationships will be explored using the framework of Prospect Theory in terms of consumer patronage (willingness-to-purchase and word-of-mouth).This study includes a brief history of the development of the lodging industry in the United States from inns and taverns to the modern hotel industry that is a critical sector of the hospitality and tourism economy. Current statistics are provided regarding the U.S. and Central Florida hotel industry in order to provide both a national and local economic perspective. The study also provides relevant statistics regarding U.S. domestic traveller information.The included literature review consists of concepts of mental accounting theory, economic utility theory, prospect theory, personal fairness, social fairness, and consumer patronage. The study also discusses how the lodging industry is unique in its implementation of reservation cancellation policies when compared against other industries. Research regarding merchandise return policies is also discussed here. The study was designed to investigate three separate components of both personal and social fairness. The first component investigated the effects of hotel rate price increases and discounts on personal fairness when compared against an existing reference price. The second component studied the perceptions of social fairness on three established hotel cancellation policies. The third component introduces a treatment of distributive and procedural fairness violations as a moderator to observe the effects on consumer patronage for the same three hotel cancellation policies. The data were collected from 415 hotel guests staying in Central Florida hotels near the Orlando international airport using an experimental method which provided different written scenarios regarding hotel pricing and three different hotel cancellation policies. The data was then analyzed using Analysis of Variance (ANOVA) and Tukey's Post Hoc test to provide results that allowed the comparison of effects on each in terms of consumer patronage. The study results indicated that that price increases against established reference prices had a significant negative effect on consumer patronage whereas discounts of the same magnitude had a significant effect only in the middle range. Included smaller and large discounts did not have a significant effect on consumer patronage outside of the middle range. The study results also indicated that there was significant difference in consumer patronage between an Open cancellation policy and a 48 Hour Cancellation Policy. There is a significant difference in consumer patronage when a No Refund policy is compared against both the Open Cancellation Policy and the 48 Hour Cancellation Policy. The study results also show that a violation of either Distributive Fairness or Procedural Fairness has a significant negative effect on consumer patronage for both an Open Cancellation policy and 48 Hour Cancellation Policy. However, when Distributive Fairness or Procedural Fairness violations are introduced as a moderator, there is no significant effect on a No Refund Cancellation Policy.The study and its ensuing results are of importance to the academic community in that it provides additional scholarly support to both Prospect Theory and the theory of mental accounting and the roles that each plays in consumer behavior. From an industry practitioner perspective, the current results provide insight into hotel consumer's attitudes regarding rate increases/ discounts and the implementation of the three different hotel cancelation policies. The results can be utilized to provide justification and guidance in altering or establishing hotel cancellation policies that hotel consumers consider to be fair.
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Date Issued
2012
Identifier
CFE0004269, ucf:49508
Format
Document (PDF)
PURL
http://purl.flvc.org/ucf/fd/CFE0004269