Multi-hop broadcast is one of the main approaches to disseminate data in VANET. Therefore, it is important to design a reliable multi-hop broadcast protocol, which satis es both reachability and bandwidth consumption requirements. In a dense network, where vehicles are very close to each other, the number of vehicles needed to rebroadcast the message should be small enough to avoid a broad- cast storm, but large enough to meet the reachability requirement. If the network is sparse, a higher number of vehicles is needed to retransmit to provide a higher reachability level. So, it is obvious that there is a tradeo between reachability and bandwidth consumption. In this work, considering the above mentioned challenges, we design a number of smart broadcast protocols and evaluate their performance in various network den- sity scenarios. We use fuzzy logic technique to determine the quali cation of vehicles to be forwarders, resulting in reachability enhancement. Then we design a band- width e cient fuzzy logic-assisted broadcast protocol which aggressively suppresses the number of retransmissions. We also propose an intelligent hybrid protocol adapts to local network density. In order to avoid packet collisions and enhance reachability, we design a cross layer statistical broadcast protocol, in which the contention window size is adjusted based on the local density information. We look into the multi-hop broadcast problem with an environment based on game theory. In this scenario, vehicles are players and their strategy is either to volunteer and rebroadcast the received message or defect and wait for others to rebroadcast. We introduce a volunteer dilemma game inspired broadcast scheme to estimate the probability of forwarding for the set of potential forwarding vehicles. In this scheme we also introduce a fuzzy logic-based contention window size adjustment system. Finally, based on the estimated spatial distribution of vehicles, we design a transmission range adaptive scheme with a fuzzy logic-assisted contention window size system, in which a bloom lter method is used to mitigate overhead. Extensive experimental work is obtained using simulation tools to evaluate the performance of the proposed schemes. The results con rm the relative advantages of the proposed protocols for di erent density scenarios. / Includes bibliography. / Dissertation (Ph.D.)--Florida Atlantic University, 2017. / FAU Electronic Theses and Dissertations Collection

We propose a distributed, collaborative traffic congestion detection and dissemination system using VANET that makes efficient use of the communication channel, maintains location privacy, and provides drivers with real-time information on traffic congestions over long distances. The system uses vehicles themselves, equipped with simple inexpensive devices, as gatherers and distributors of information without the need for costly road infrastructure such as sensors, cameras or external communication equipment. Additionally, we present a flexible simulation and visualization framework we designed and developed to validate our system by showing its effectiveness in multiple scenarios and to aid in the research and development of this and future VANET applications. / by Francisco M. Padron. / Thesis (M.S.C.S.)--Florida Atlantic University, 2009. / Includes bibliography. / Electronic reproduction. Boca Raton, Fla., 2009. Mode of access: World Wide Web.

The purpose of this study was to identify (1) the effectiveness of the Intel Essentials model of project-based learning based on student Florida Comprehensive Assessment test (FCAT) reading scores; (2) the differences in student engagement between students in classes with teachers trained in the Intel Essentials model of project-based learning and teachers not trained in the model as measured by the Beliefs about Classroom Structures Survey; (3) the level of implementation (high, average, or low) of teachers trained in the Intel Essentials model of project-based learning; and (4) any correlation between the level of implementation and the level of student engagement. A total of 32 teachers participated in the study. The teachers were split into 2 groups: the experimental group (N = 16) that participated in the Intel Essentials Training, and the control group (N = 16) that did not participate in the training. The results for this study were mixed. The students of the experimental group teachers (N = 780) had significantly higher (p < .05) FCAT scores than that of the control group students (N = 643). The control group with the exception of Motivating Tasks subscale had significantly higher levels of engagement. The correlation between level of implementation and student engagement produced a moderate negative correlation, meaning that the Intel trained teachers with the highest levels of implementation had the lowest levels of engagement. / by Jeremy R. Wright. / Thesis (Ed.D.)--Florida Atlantic University, 2009. / Includes bibliography. / Electronic reproduction. Boca Raton, Fla., 2009. Mode of access: World Wide Web.

The Transmission Control Protocol (TCP) is one of the core protocols of the Internet protocol suite, which is used by major Internet applications such as World Wide Web, email, remote administration and file transfer. TCP implements scalable and distributed end-to-end congestion control algorithms to share network resources among competing users. TCP was originally designed primarily for wired networks, and it has performed remarkably well as the Internet scaled up by six orders of magnitude in the past decade. However, many studies have shown that the unmodified standard TCP performs poorly in networks with large bandwidth-delay products and/or lossy wireless links. In this thesis, we analyze the problems TCP exhibits in the wireless communication environment, and develop joint TCP congestion control and wireless-link scheduling schemes for mobile applications. ... Different from the existing solutions, the proposed schemes can be asynchronously implemented without message passing among network nodes; thus they are readily deployable with current infrastructure. Moreover, global convergence/stability of the proposed schemes to optimal equilibrium is established using the Lyapunov method in the network fluid model. Simulation results are provided to evaluate the proposed schemes in practical networks. / by Zhaoquan Li. / Thesis (Ph.D.)--Florida Atlantic University, 2013. / Includes bibliography. / Mode of access: World Wide Web. / System requirements: Adobe Reader.

Image Processing and Computer Vision solutions have become commodities for software developers, thanks to the growing availability of Application Program- ming Interfaces (APIs) that encapsulate rich functionality, powered by advanced al- gorithms. To understand and create an e cient method to process faces in images by computers, one must understand how the human visual system processes them. Face processing by computers has been an active research area for about 50 years now. Face detection has become a commodity and is now incorporated into simple devices such as digital cameras and smartphones. An iOS app was implemented in Objective-C using Microsoft Cognitive Ser- vices APIs, as a tool for human vision and face processing research. Experimental work on image compression, upside-down orientation, the Thatcher e ect, negative inversion, high frequency, facial artifacts, caricatures and image degradation were completed on the Radboud and 10k US Adult Faces Databases along with other images. / Includes bibliography. / Thesis (M.S.)--Florida Atlantic University, 2016. / FAU Electronic Theses and Dissertations Collection

Submitted by Marlucy Farias Medeiros (marlucy.farias@unipampa.edu.br) on 2017-10-02T18:23:28Z No. of bitstreams: 1 Marcelo Pereira Magalhães - 2017.pdf: 16186012 bytes, checksum: dc2e2c4f42a58ebcadb895281114a36d (MD5) / Approved for entry into archive by Marlucy Farias Medeiros (marlucy.farias@unipampa.edu.br) on 2017-10-04T17:35:03Z (GMT) No. of bitstreams: 1 Marcelo Pereira Magalhães - 2017.pdf: 16186012 bytes, checksum: dc2e2c4f42a58ebcadb895281114a36d (MD5) / Made available in DSpace on 2017-10-04T17:35:03Z (GMT). No. of bitstreams: 1 Marcelo Pereira Magalhães - 2017.pdf: 16186012 bytes, checksum: dc2e2c4f42a58ebcadb895281114a36d (MD5) Previous issue date: 2017-05-12 / This thesis presents the design and analysis of an antenna array system for mobile communication services in a scenario using high altitude platforms (HAPs). For this purpose, a dual-band and dual-polarized microstrip antenna array has been designed, whereby the array should receive the signal in one band and resend it in the other operating band. These requirements have been fulfilled by using a stacked arrangement, whereby each patch has been fed by independent feed lines. Circular polarization was obtained by the use of square patches with truncated corners. Optimizations were needed so as to compensate the effects of mutual coupling on the axial ratio level. To perform the radiation pattern synthesis for the transmission function, an algorithm to calculate the required excitation coefficients was employed to steer the main beam and to control the side lobe level. Additionally to the array design, the development of the high-frequency (HF) circuitry for the retransmission is described. The design of the transmitter was done using off-the-shelf components, which have been tested individually prior to the final integration into the final layout. During the tests, the need of knowledge of the electromagnetic properties of the printed circuit layout and the active/passive components is crucial for a successful design. In order to accelerate the development of HF circuitry, a procedure to perform electromagnetic simulations of HF printed circuit boards is proposed. Experimental results demonstrated that this procedure yielded accurate engineering predictions. / Este trabalho apresenta o projeto e análise de um sistema de rede de antenas para serviços de comunicações móveis em um cenário empregando plataformas de alta altitude (HAPs). Para este fim, uma rede de antenas de microfita foi projetada para operar em dupla-banda e dupla-polarização, onde a rede deve receber o sinal em uma banda e reenviá-lo em outra. Esses requisitos foram cumpridos usando uma rede de antenas com m´ultiplas camadas, onde cada patch foi alimentado por linhas de alimentação independentes. A polarização circular foi obtida pelo uso de patches quadrados com os cantos truncados. Foram necessárias otimizações para compensar os efeitos de acoplamento mútuo no nível da razão axial. Para realizar o controle do diagrama de irradiação para o modo de transmissão, utilizou-se um algoritmo para calcular os pesos necessários para apontar o lóbulo principal e controlar o nível dos lóbulos laterais. Adicionalmente ao projeto da rede, o desenvolvimento de um circuito em alta frequência (HF) para a retransmissão foi descrito. O projeto do circuito transmissor foi realizado empregando componentes comerciais, que foram testados individualmente antes da integração final. Durante os testes em bancada, ficou evidente a necessidade de predição do comportamento eletromagnético do layout da placa de circuito impresso e dos componentes ativos/passivos para obtenção de bons resultados. Com o intuito de acelerar o processo de desenvolvimento de circuitos em HF, um procedimento para a realização de simulações eletromagnéticas de placas de circuito impresso foi proposto. Os resultados experimentais demonstraram que este procedimento produziu bons resultados.

by Hui Ching-Han, Kuok Li-Wen. / Thesis (M.B.A.)--Chinese University of Hong Kong, 2003. / Includes bibliographical references (leaves 112-114). / Questionnaire also in Chinese. / ABSTRACT --- p.i / TABLE OF CONTENTS --- p.iii / LIST OF TABLES AND FIGURES --- p.viii / ACKNOWLEDGEMENTS --- p.ix / Chapter CHAPTER I --- PROJECT INTRODUCTION --- p.1 / Objective --- p.3 / Scope of Study --- p.3 / Methodology --- p.4 / Primary Data Gathering --- p.4 / Secondary Data Gathering --- p.5 / Data Presentation and Analysis --- p.5 / Limitations --- p.6 / Chapter CHAPTER II --- COMPANY BACKGROUND --- p.8 / Mother Company - HK-listed TCL International Holdings Ltd --- p.8 / Maker and Designer of Consumer Electronic Products --- p.8 / Foreign Ownership --- p.8 / China State-Owned Background --- p.9 / Brand Value --- p.10 / Expanding its Overseas Footprint --- p.10 / Source of Income by Market and Product --- p.11 / Performance --- p.11 / Corporate Strategies --- p.13 / Corporate Goal --- p.13 / Business Portfolio --- p.14 / Strategic Partnerships --- p.14 / Nam Tai Electronics --- p.14 / Ericsson --- p.15 / TTPCom --- p.15 / TCL Mobile Communication Co. Ltd --- p.16 / History and Background --- p.16 / Ownership --- p.16 / Sales Performance --- p.17 / Strong Management Team --- p.18 / Scale --- p.19 / Mission --- p.19 / Corporate Culture --- p.19 / Strategy --- p.20 / Mobile Communication Business Plans --- p.22 / Overseas Market Development - HK Market the First Testing Ground --- p.22 / TCL Mobile Information International Company Limited - HK office --- p.23 / Chapter CHAPTER III --- CHINA MOBILE PHONE MARKET --- p.24 / General Market Situation - Supply Side --- p.24 / Number One World Manufacturing Base --- p.24 / Dominant Standard --- p.24 / Revenue and Future Size --- p.25 / General Market Situation - Demand Side --- p.25 / China Consumer Characteristics --- p.26 / Five Faces - Market Segmentation --- p.26 / Location Difference --- p.27 / Most Preferred Brands --- p.27 / Myth of Advertisement --- p.27 / TCL Mobile Phone in China --- p.28 / Largest Mobile Phone Marker in China --- p.28 / Top Five Brands in China --- p.28 / Lucrative Mobile Phone Market - Earnings Driver --- p.29 / Major Foreign Competitors --- p.29 / Major China Competitors --- p.30 / Price War With Profit Margin Unaffected --- p.30 / 4Ps of TCL Mobile Phones --- p.30 / Chapter CHAPTER IV --- HONG KONG MOBILE PHONE MARKET --- p.33 / HK Telecommunication Market - Highlighting Mobile Phone Sub-Sector --- p.33 / Potential Regional Mobile Hub --- p.33 / Highest Telephone Density and Penetration Rate in Asia --- p.34 / Pioneer in Adopting New Technologies and Services --- p.36 / Replacement Mobile Phone Market --- p.37 / Large Business Receipts from Mobile Phone Telecommunication Sub-sector --- p.37 / Network Services Providers --- p.37 / Famous Mobile Phone Brands Dominate Market --- p.38 / Mobile Phone Business Receipts --- p.38 / Characteristics of Hong Kong Consumers --- p.39 / 4Ps of generic brands in Hong Kong market --- p.39 / Recent Developments --- p.41 / Current TCL 4Ps in HK --- p.42 / Price - Medium Pricing --- p.42 / Product - Limited Product Mix with Generic Features --- p.42 / Place - Weak distribution in network service providers --- p.45 / Promotion - No sustainable advertisement after launch --- p.46 / Differences between Hong Kong and the China Market --- p.47 / Chapter CHAPTER V --- SURVEY --- p.49 / Timeline of Survey --- p.49 / Target Market --- p.49 / Methodology --- p.50 / Focus Group --- p.50 / Pilot Test --- p.50 / Quota Sampling --- p.50 / Structure of Questionnaire --- p.51 / Showing Dummy Product --- p.52 / Survey Results Compatible --- p.52 / Highlights and Implications of Survey Results --- p.53 / Part I: HK Mobile Phone Market ´ؤ Usage and Preference --- p.53 / Suggestions in Cracking HK Market by 4Ps Analysis --- p.56 / Part II: Highlights and Implications of the TCL Related Data (4Ps) --- p.57 / Chapter CHAPTER VI --- DATA ANALYSIS --- p.60 / Sample Size --- p.60 / Analysis of the Results of Survey --- p.60 / Demographics --- p.60 / Part I: Mobile Phone Usage and Preference --- p.61 / Current Brand --- p.61 / Frequency of Changing Mobile Phones --- p.62 / Reasons for Replacing Mobile Phone --- p.66 / Mobile Phone Selection Criteria --- p.66 / Preferred Place to Purchase Mobile Phone --- p.72 / Part II: TCL Mobile Phone --- p.75 / General Idea of TCL --- p.75 / Product --- p.75 / Price --- p.81 / Place --- p.82 / Promotion --- p.83 / Confidence in TCL Mobile Phone --- p.85 / Chapter CHAPTER VII --- CONCLUSIONS --- p.88 / The Fate of TCL in the Hong Kong Market --- p.88 / Chapter CHAPTER VIII --- RECOMMENDATIONS --- p.90 / Target Market --- p.90 / Need Market Research --- p.90 / Broaden Target Market --- p.90 / Brand Image --- p.91 / Price --- p.92 / Product --- p.92 / Place --- p.94 / Promotion --- p.94 / APPENDIX 1 Terms (in alphabetical order) --- p.96 / APPENDIX 2 Development Milestones of TCL Mobile Communication --- p.100 / APPENDIX 3 Milestones of Telecommunications (Mobile Phone sub-sector) in Hong Kong..… --- p.102 / APPENDIX 4 (SURVEY: ENGLISH VERSION) --- p.106 / APPENDIX 5 (SURVEY: CHINESE VERSION) --- p.109 / BIBLIOGRAPHY --- p.112 / Periodicals --- p.112 / Interview --- p.114

Our goal in this research is to investigate and determine how to best support a challenging mobile wireless network based in a military operational environment. Since routing protocols used in mobile ad hoc networks (MANET) must adapt to frequent or continual changes of topology, while simultaneously limiting the impact of tracking these changes on wireless resources, we focused our initial research on improving the efficiency of route discovery. We proposed and designed a new MAC layer routing protocol that pursues reduced routing overhead, greater interaction of network protocol layers and passive neighbor/path discovery. This algorithm, called Virtual MAC Tag Switching (VMTS), evolved as we implemented a prototype in the ns-2 network simulator and conducted simulation analysis of existing protocols: DSDV, DSR and AODV. Upon analyzing the performance of existing routing protocols using pragmatic metrics not applied in any MANET literature it was found that current MANET models produce unsatisfactory performance. Subsequent analysis of transport layer protocol behaviors pinpointed the causes that undermine the performance of the existing protocols and would have thwarted VMTS as well.

Mobile technology is improving in quality and capability faster now than ever before. When first introduced, cell phones were strictly used to make voice calls; now, they play satellite radio, MP3s, streaming television, have GPS and navigation capabilities, and have multi-megapixel video cameras. In the near future, cell phones will have programmable graphics processing units (GPU) that will allow users to play games similar to those currently available for top-of-the-line game consoles. Personal digital assistants enable users with full email, scheduling, and internet browsing capabilities in addition to those features offered on cell phones. Underlying all this mobile technology and entertainment is a battery whose technology has just barely tripled in the past 15 years, compared to available disk capacity that has increased over 1,000-fold. Ray tracing is a rendering technique used to generate photorealistic images that include reflections, refraction, participating media, and can fairly easily be extended to include photon mapping for indirect illumination and caustics. In recent years, ray tracing has been implemented on the GPU using various acceleration structures to facilitate rendering. Until now, all studies have used build time and achievable frame rates to determine which acceleration structure is best for ray tracing. We present the very first results comparing both CPU and GPU raytracing using various acceleration structures in terms of energy consumption. By exploring per-pixel costs, we provide insight on the energy consumption and frame rates that can be experienced on cell phones and other mobile devices based on currently available screen resolutions. Our results show that the choice in processing unit has the greatest affect on energy and time costs of ray tracing, followed by the size of the viewport used, and the choice of acceleration structure has the least impact on efficiency. For mobile devices enabled with a programmable GPU, whether it is a cell phone, PDA, or laptop computer, a bounding volume hierarchy implemented on the GPU is the most energy-efficient acceleration structure for ray tracing. Ray tracing on cellular phones with smaller screen resolutions is most energy-efficient using a CPU-based Kd-Tree implementation.

Frequency domain techniques have been widely used in indoor radio propagation measurements and modeling for telecommunication applications. This work addresses measurement of the time of arrival (TOA) of the first path for geolocation applications using results of frequency domain channel measurements. First, we analyze the effect upon TOA measurement accuracy due to: sampling period of the radio channel in the frequency domain, sampling period in the time domain used for detection of the TOA and the windowing filter used before transformation to the time domain. Then, we provide some results of measurement made in line of sight (LOS) and Obstructed LOS (OLOS) indoor environments in order to compare the characteristics of the measured TOA in these two important scenarios for indoor geolocation applications. Finally, we compare the measurement results with the ray tracing based model that had been developed previously for indoor geolocation applications.