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1,073 Matching Results
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Practical Robust MIMO OFDM Communication System for High-Speed Mobile Communication
This thesis presents the design of a communication system (PRCS) which improves on all aspects of the current state of the art 4G communication system Long Term Evolution (LTE) including peak to average power ratio (PAPR), data reliability, spectral efficiency and complexity using the most recent state of the art research in the field combined with novel implementations. This research is relevant and important to the field of electrical and communication engineering because it provides benefits to consumers in the form of more reliable data with higher speeds as well as a reduced burden on hardware original equipment manufacturers (OEMs). The results presented herein show up to a 3 dB reduction in PAPR, less than 10-5 bit errors at 7.5 dB signal to noise ratio (SNR) using 4QAM, up to 3 times increased throughput in the uplink mode and 10 times reduced channel coding complexity.
Date:
May 2015
Creator:
Grabner, Mitchell John James
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Return-Entry Risk Communication Following 2012 Hurricane Sandy
Within risk communication, much is understood about pre-event warning related to evacuation and sheltering; however risk communication during the return-entry phase when ending evacuations has been largely under-studied in the disaster literature. Understanding of the return-entry risk communication process is important because returning early or prior to issuance of the all-clear message can make returnees susceptible to post-disaster risks, and also hamper post-disaster activities such as debris removal, traffic management, utility restoration and damage assessments. Guided by the Warning Components Framework and the Theory of Motivated Information Management, this dissertation focuses on risk communication as it pertains to organizational behavior during the return-entry process by examining how local emergency management organizations develop, disseminate and monitor return-entry messages. The data is collected through semi-structured telephone interviews with local emergency management organizations that managed return-entry following Hurricane Sandy. The findings of the study indicate that local emergency management organizations required information on post-disaster threats, damages, and utility and infrastructure condition in order to develop return-entry strategy for their community. Organizations improvised to their existing risk communication measures by adopting creative ways for information dissemination to the evacuees. They also utilized active and passive approach to monitor public response to the return-entry messages.
Date:
December 2015
Creator:
Manandhar, Rejina
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Rooting the Study of Communication Activism in an Attempted Book Ban
This article discusses how strong, sustained university-community partnerships can mitigate criticism and skepticism when scholars and their students delve into political and contested questions.
Date:
2015
Creator:
Jovanovic, Spoma; Congdon, Mark; Miller, Crawford & Richardson, Garrett
Object Type:
Article
System:
The UNT Digital Library
Advanced Power Amplifiers Design for Modern Wireless Communication
Modern wireless communication systems use spectrally efficient modulation schemes to reach high data rate transmission. These schemes are generally involved with signals with high peak-to-average power ratio (PAPR). Moreover, the development of next generation wireless communication systems requires the power amplifiers to operate over a wide frequency band or multiple frequency bands to support different applications. These wide-band and multi-band solutions will lead to reductions in both the size and cost of the whole system. This dissertation presents several advanced power amplifier solutions to provide wide-band and multi-band operations with efficiency improvement at power back-offs.
Date:
August 2015
Creator:
Shao, Jin
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Interrelated Histories, Practices, and Forms of Communication: Using Arabic Calligraphy to Learn Arabic Typography
In this self-study inquiry, I studied my graphic design practice in a professional setting, focusing on my Arabic typographic skills and knowledge. My roles as researcher and design educator indivisibly intertwined throughout this research. I worked to understand the value of calligraphy in art and design education, highlighting its power as an art form while also emphasizing its pedagogical potentials. I utilized two theoretical approaches suited to investigating and understanding the Arabic letters as text and image, Ibn Arabi’s science of letters, or 'ilm al-hurûf, and semiotics. I applied my theoretical framework to three distinctive artworks to investigate their uses of the Arabic letters, contemplating their roles in modern and contemporary Arab art. Essential to my research was learning Arabic calligraphy through two approaches: 1) I attended a calligraphy workshop, and 2) I conducted three self-study experimentations. I analyzed my experience through visual representations, commentary, and narrative inquiry to assess Arabic calligraphy’s significance for graphic design education. As such, my experimentations confirmed Arabic calligraphy’s aesthetic and educational value. I employed my findings to create a contemporary Arabic typography curriculum suitable for university-level students. This curriculum is built on learning theories such as visual culture analysis, semiotics, constructivist theory, play principles, …
Date:
August 2015
Creator:
Al-Ansari, Banan Ahmed
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
A Preliminary Controller Design for Drone Carried Directional Communication System
In this thesis, we conduct a preliminary study on the controller design for directional antenna devices carried by drones. The goal of the control system is to ensure the best alignment between two directional antennas so as to enhance the performance of air-to-air communication between the drones. The control system at the current stage relies on the information received from GPS devices. The control system includes two loops: velocity loop and position loop to suppress wind disturbances and to assure the alignment of two directional antennae. The simulation and animation of directional antennae alignment control for two-randomly moving drones was developed using SIMULINK. To facilitate RSSI-based antenna alignment control to be conducted in the future work, a study on initial scanning techniques is also included at the end of this thesis.
Date:
August 2015
Creator:
AL-Emrani, Firas
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Back on the Home Front: Demand/Withdraw Communication and Relationship Adjustment Among Student Veterans
Today’s military encompasses a wide variety of families who are affected by deployments in multiple and complex ways. Following deployments, families must reconnect in their relationships and reestablish their way of life. Appropriate and effective communication during this time is critical, yet many military couples struggle with this process. Moreover, student service members/veterans and their families are in a unique position. In addition to coping with changes in their marital relationship, student veterans may feel isolated or unsupported on college campuses, often experiencing anxiety, depression, posttraumatic stress, or suicidality. The current study seeks to bridge the gap between the military family literature and the student service member/veteran literature by examining how deployment experiences, mental health issues, and communication patterns influence post-deployment relationship adjustment among student veterans. Analyses tested whether communication style and/or current mental health concerns mediate associations between combat experiences and couples’ relationship adjustment, as well as between experiences in the aftermath of battle and relationship adjustment. Results suggest that although posttraumatic stress is significantly related to deployment experiences among student veterans, participants report no significant negative effects of deployment on relationship adjustment. Communication style, however, was significantly associated with relationship adjustment, and a lack of positive communication was …
Date:
August 2015
Creator:
Carver, Kellye Diane Schiffner
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Investigating Communication and Warning Channels to Enhance Crowd Management Strategies: a Study of Hajj Pilgrims in Saudi Arabia
The global increase in the number of mass gatherings and crowded events has brought with it new emergencies and unintended consequences for public administrators and first responders. Crowd managers attempt to overcome these challenges by enhancing operations, alleviating financial losses, keeping event organizers safe from liability and, most importantly, keeping the attendees safe. Effective communication among and between officials and guests has been identified as a key element in this process. However, there is a lack of risk communication studies, especially about heterogeneous crowds that congregate at religious events. With this gap in mind, this research aims to investigate the use of major communication channels available and/or preferred by Muslim pilgrims in Makkah, Saudi Arabia during Hajj to gauge their effectiveness in communicating risk information. This annual religious pilgrimage was chosen because it attracts over 2 million pilgrims from more than 140 countries, most of whom speak different languages and belong to different cultures but perform the same rituals at the same time. This dissertation seeks to answer three broad research questions: “what are the most popular communication channels used by pilgrims,” “what are the weaknesses of the current communication strategies,” and “what can be done to improve risk communication …
Date:
May 2015
Creator:
Taibah, Hassan
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Unethical Prosocial Behavior: Theory Development and Experimental Findings
Job performance has historically been divided into two subsets, that which is prescribed and that which is discretionary. Further, discretionary workplace behavior has typically been described as either helpful or ethical (i.e. organizational citizenship behavior) or harmful and unethical (i.e. workplace deviance behavior) with behavior that is both helpful and unethical rarely discussed. I term this lesser discussed type of discretionary workplace behavior unethical prosocial behavior and define it as discretionary actions that are intended to benefit a specific referent outside the self, either an individual or a group, that are illegal and/or morally inappropriate to larger society. In addition to defining unethical prosocial behavior, this paper places the behavior in an organizing framework of discretionary workplace behaviors and tests several hypotheses regarding unethical prosocial behavior. The hypotheses address three primary research questions. First, are there contextual conditions that make it more likely that a person will engage in unethical prosocial behavior? Second, does the nature of the relationship between the actor and the beneficiary make unethical prosocial behavior more or less likely? And third, are there individual characteristics that serve to either constrain or enhance the likelihood that and individual will engage in unethical prosocial behavior? A 2 x …
Date:
August 2015
Creator:
Herchen, Julia L.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Parenting Style, Frequency of Electronic Communication with Parents, and the Development of Independence in First Year, First Semester College Students
During the transition to college, emerging adults are expected to develop independence and increase individual responsibility as they live away from home for the first time. Modern electronic communication has enabled emerging adults to maintain frequent, daily contact with the parent, a pattern of communication Hofer refers to as an “electronic tether.” This study examined the link between parenting style and the development of independence of first year, first semester college students. Although these students were in frequent contact with their designated parent, no correlation between frequency of communication and parenting style or independence was found. Both authoritative and helicopter parenting significantly positively predicted attitudinal independence. However, permissive parenting functioned as a significant negative predictor. Authoritarian, permissive, and helicopter parenting significantly positively predicted conflictual independence. However, authoritative parenting functioned as a significant negative predictor. Both authoritative and helicopter parenting significantly positively predicted emotional and functional independence.
Date:
August 2015
Creator:
Etheridge, Lauri McAfee
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Sexual Identity Development: Findings From an Exploratory Grounded Theory Study
Counselors and other mental health professionals lack training on healthy sexuality and sexual identity development (SID). To begin to construct a comprehensive model of SID that can be used in counseling and counselor education, I conducted an exploratory study utilizing a grounded theory approach to collect and analyze SID stories from a purposive sample of eight adults from the Dallas-Fort Worth, Texas area: four male and four female; seven White Caucasian-American and one Asian American; and self-identified as two gay, one lesbian, three heterosexual, and two sexually fluid. Participants elucidated a process model of the sexual-self that incorporated biological, psychological, social, cultural, and spiritual factors. Emergent themes included discovering, distinguishing, placing boundaries around, differentiating, and integrating the sexual-self. This preliminary model advanced a more holistic understanding of SID that counselors and other mental health professionals, educators, and researchers may find useful within their respective disciplines.
Date:
August 2015
Creator:
Kinsey, Lee
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Theoria, Volume 22, 2015
Annual journal containing essays, studies, book reviews, and other articles related to the history of Western Music Theory, methods of analysis, and analytical discussions of musical compositions. The appendix includes information about contributors to the current volume, and an index of content in previously-issued volumes.
Date:
2015
Creator:
Heidlberger, Frank
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
A Restorative Environmental Justice for the Prison Industrial Complex: a Transformative Feminist Theory of Justice
This dissertation provides a feminist restorative model of environmental justice that addresses the injustices found within UNICOR’s e-waste recycling operations. A feminist restorative environmental justice challenges the presupposition that grassroots efforts, law and policy, medical and scientific research, and theoretical pursuits (alone or in conjunction) are sufficient to address the emotional and relational harm of environmental injustices. To eliminate environmental harms, this model uses collaborative dialogue for interested parties to prevent environmental harm. To encourage participation, a feminist restorative model accepts many forms of knowledge and truth as ‘legitimate’ and offers an opportunity for women to share how their personal experiences of love, violence, and caring differ from men and other women and connect to larger social practices. This method of environmental justice offers opportunities for repair, reparation and reintegration that can transform perspectives on criminality, dangerous practices and structures in the PIC, and all persons who share in a restorative encounter.
Date:
May 2015
Creator:
Conrad, Sarah M.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Burner Project: Privacy and Social Control in a Networked World
As mobile phones become increasingly ubiquitous in today’s world, academic and public audiences alike are curious about the interaction between mobile technologies and social norms. To investigate this phenomenon, I examined how individuals use technology to actively manage their communication behaviors. Through a three-month research project on usage patterns of Burner, a mobile application, this thesis explores the relationships among technology, culture, and privacy. Burner is a service that equips individuals with the means to create, maintain, and/or dissolve social ties by providing temporary, disposable numbers to customers. The application offers a way to communicate without relying on a user’s personal phone number. In other words, Burner acts as a “privacy layer” for mobile phones. It also provides a valuable platform to examine how customers use the application as a strategy for communication management. This thesis represents a marriage of practice and theory: (1) As an applied enterprise, the project was constructed as a customer needs assessment intending to examine how the service was situated in the lives of its users. The findings have successfully been applied to my client’s company strategy and have led to a more informed customer approach. (2) As an academic endeavor, this research contributes to …
Date:
May 2015
Creator:
Shade, Molly
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Explaining Economic Development Strategies Using Product Differentiation Theory: a Reconceptualization of Competition Among City Governments
Local governments do not operate in a vacuum. Instead, they are part of a complex “polycentric” system of governments where politically autonomous and self-ruled cities compete with one another over taxable wealth. Missing from the scholarship on metropolitan governance is an understanding of the factors driving competition among local governments. The purpose of this dissertation is to fill this gap by examining how interjurisdictional competition over economic development impacts a city’s choice of strategies for attracting business and residential investment and how those strategies affect revenue collection. First, this dissertation examines whether cities, knowing the economic development strategies of their neighboring cities, pursue similar types of businesses? Or do cities strategically target different types of businesses as a way to avoid the negative consequences of competition? Second, this dissertation explores what impact the decision to pursue similar or dissimilar businesses has on the revenue collection of local governments. Using spatial data analysis to analyze a sample of 2,299 cities, this dissertation finds general support for both theoretical frameworks presented. Overall, the findings from both analyses provide unique insights into metropolitan governance and interjurisdictional competition.
Date:
May 2015
Creator:
Overton, Michael R.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
A Case Study of an Urban Charter School’s Journey of School Improvement: Organizational Theory, Institutional Learning and School Reform
The problem for this study was the need to increase and maintain in student achievement in charter schools. The purpose of this single-case study was to discover how an inner city charter school with a high percentage of at-risk students increased overall student achievement and attained acceptable performance status when faced simultaneously with administrative challenges and increases in state and federal standards. The participants for the single-case study included the school district’s superintendent, the high school principal, the dean of students, four faculty of the district, and one outside consultant appointed to work with the district by the state of Texas. The sampling for this study allowed for the opportunity to study in greater depth the choice of reform strategies and organizational structure designed to result in increased student achievement and student success over the course of two years. Since this was a single-case study of one charter school district, participants were referenced by the role in which they served. All district, campus, and participant names remained anonymous. The results showed the increased student achievement was made possible by several reform strategies and best practices. The primary reform strategies and best practices that had the greatest impact were consistent campus …
Date:
May 2015
Creator:
Subjinski, Amanda
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Lines by Someone Else: the Pragmatics of Apprompted Poems
Over the last sixty years, overtly intertextual poems with titles such as “Poem Beginning with a Line by John Ashbery” and “Poem Ending with a Line by George W. Bush” have been appearing at an increasing rate in magazines and collections. These poems wed themselves to other texts and authors in distinct ways, inviting readers to engage with poems which are, themselves, in conversation with lines from elsewhere. These poems, which I refer to as “apprompted” poems, explicitly challenge readers to investigate the intertextual conversation, and in doing so, they adopt inherent risks. My thesis will chart the various effects these poems can have for readers and the consequences they may hold for the texts from which they borrow. Literary critics such as Harold Bloom and J. H. Miller have described the act of borrowing as competitive and parasitic—“agon” is Bloom’s term for what he sees as the oedipal anxiety of poets and poets’ texts to their antecedents, but an investigation of this emerging genre in terms of linguistic pragmatics shows that apprompted poems are performing a wider range of acts in relation to their predecessors. Unlike Bloom’s theory, which interprets the impulse of poetic creation through psychoanalysis, I employ …
Date:
August 2015
Creator:
Gibson, Kimberly Dawn
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Some numerical analyses on the solubility of vanillin in Carbitol® + water solvent mixtures
This article reports solubility values of vanillin (component 3) in 2-(2-ethoxyethoxy)ethanol (Carbitol®, component 1) + water (component 2) mixtures at five temperatures from 298.15 to 318.15 K correlated with the Jouyban-Acree model combined with van't Hoff or Apelblat equations, and obtains models in second degree regarding the mixtures compositions.
Date:
May 25, 2015
Creator:
Martínez, Fleming; Jouyban, Abolghasem & Acree, William E. (William Eugene)
Object Type:
Article
System:
The UNT Digital Library
Organizational Behavior: Perceptions Analysis of Micro and Macro Organizational Behavior in an Organizational Setting
Understanding organizational behavior (OB) has profoundly influenced organizational performance and how people behave in organizations. Researchers have suggested various micro and macro organizational behaviors to be the impetus for high-performing organizations. Through a policy capturing approach this study builds on these findings by specifically examining the perceptions of micro and macro organizational behaviors in an organizational setting. The participants (n =181) completed a Micro and Macro Organizational Behavior Perceptions Questionnaire. Results showed perception differences exist between subordinates and supervisors. Additionally, participants perceived job satisfaction to be the most important micro organizational behavior, whereas organizational design was perceived to be the most important macro organizational behavior. However when comparing hierarchal positions in the organization, supervisors weighted leadership as the most important and subordinates weighted job satisfaction as the most important organizational behavior. While these findings only scratch the surface as to how organizational behavior is perceived, the implications challenge leaders to close the OB perception gap. Correspondingly, organizational behavior thinking may result in improving individual and organizational performance.
Date:
December 2015
Creator:
Delich, Joshua T.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Design fully-integrated dual-band two-stage class-E CMOS PA
In retrospect we can see that from the last century, wireless electronic technology has been in a rapid state of development. With the popularity of wireless communication, the power amplifier demand is rising. In general, magnitude, maximum noise figure, minimum noise figure, efficiency, and output power are important indicators of the amplifier. The IC industry is exploring how to reduce the additional cost and improve the high-frequency performance. Therefore, designing a strong adaptability and high cost performance of the PA has become a priority. As these technologies advance, the power amplifiers need to have better integration, lower cost, and lower power dissipation. Also, some special requirements are being asked in some areas, such as multi-mode and multi-band. In general, people have to use several power amplifiers parallel to frame a multifunction chip. Each of them working at different frequencies of interest has to have separate matching network, design, and area; also, the diversity amplifier prices will increase with the number of amplifiers, and its cost is also changed. In this thesis, because Class E power amplifier has lower power dissipation, 100% ideal efficiency, simple circuit structure, and strong applicability, the Class E is used as power amplifier in main stage. …
Date:
August 2015
Creator:
Zhao, Chao (Electrical engineering researcher)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Bottom-up assembly of metallic germanium
This article demonstrates that free electrons from distinct 2D dopant layers coalesce into a homogeneous 3D conductor using anisotropic quantum interference measurements, atom probe tomography, and density functional theory.
Date:
August 10, 2015
Creator:
Scappucci, Giordano; Klesse, Wolfgang M.; Yeoh, LaReine A.; Carter, Damien J.; Warschkow, Oliver; Marks, Nigel A. et al.
Object Type:
Article
System:
The UNT Digital Library
Does Device Matter? Understanding How User, Device, and Usage Characteristics Influence Risky IT Behaviors of Individuals
Over the past few years, there has been a skyrocketing growth in the use of mobile devices. Mobile devices are ushering in a new era of multi-platform media and a new paradigm of “being-always-connected”. The proliferation of mobile devices, the dramatic growth of cloud computing services, the availability of high-speed mobile internet, and the increase in the functionalities and network connectivity of mobile devices, have led to creation of a phenomenon called BYOD (Bring Your Own Device), which allows employees to connect their personal devices to corporate networks. BYOD is identified as one of the top ten technology trends in 2014 that can multiply the size of mobile workforce in organizations. However, it can also serve as a vehicle that transfers cyber security threats associated with personal mobile devices to the organizations. As BYOD opens the floodgates of various device types and platforms into organizations, identifying different sources of cyber security threats becomes indispensable. So far, there are no studies that investigated how user, device and usage characteristics affect individuals’ protective and risky IT behaviors. The goal of this dissertation is to expand the current literature in IS security by accounting for the roles of user, device, and usage characteristics …
Date:
August 2015
Creator:
Negahban, Arash
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
From neural and social cooperation to the global emergence of cognition
This article elaborates on a discussion of the emergence of intelligence via criticality as a consequence of locality breakdown, by using criticality for the foundation of a novel generation of game theory making the local interaction between players yield long-range effects.
Date:
June 16, 2015
Creator:
Grigolini, Paolo; Piccinni, Nicola; Svenkeson, Adam; Pramukkul, Pensri; Lambert, David & West, Bruce J.
Object Type:
Article
System:
The UNT Digital Library
Airbourne WiFi Networks Through Directional Antenna: An Experimental Study
In situations where information infrastructure is destroyed or not available, on-demand information infrastructure is pivotal for the success of rescue missions. In this paper, a drone-carried on demand information infrastructure for long-distance WiFi transmission system is developed. It can be used in the areas including emergency response, public event, and battlefield. The WiFi network can be connected to the Internet to extend WiFi access to areas where WiFi and other Internet infrastructures are not available. In order to establish a local area network to propagate WIFI service, directional antennas and wireless routers are used to create it. Due to unstable working condition on the flying drones, a precise heading turning stage is designed to maintain the two directional antennas facing to each other. Even if external interferences change the heading of the drones, the stages will automatically rotate back to where it should be to offset the bias. Also, to maintain the same flying altitude, a ground controller is designed to measure the height of the drones so that the directional antennas can communicate to each other successfully. To verify the design of the whole system, quite a few field experiments were performed. Experiments results indicates the design is reliable, …
Date:
May 2015
Creator:
Gu, Yixin
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library