Web services have become increasingly important over the past decades. Versatility and platform independence are just some of their advantages. On the other hand, grid computing enables the efficient distribution of computing resources. Together, they provide a great source of computing power that can be particularly leveraged by mobile devices. Mobile computing enables information creation, processing, storage and communication without location constraints [63], not only improving business' operational efficiency [63] but actually changing a way of life. However, the convenience of anytime and anywhere communication is counterbalanced by small screens, limited computing power and battery life. Despite these limitations, mobile devices can extend grid functionality by bringing to the mix not only mobile access but sensing capabilities as well, gathering information from their surroundings through built in mechanisms, such as microphone, camera, GPS and even accelerometers. Prior work has already demonstrated the possibility of enabling Web Services Resource Framework (WSRF) access to grid resources from mobile device clients in the WSRF-ME project [39], where a representative Nokia S60 Smartphone application was created on a framework, which extends the JSR-172 functionality to achieve WSRF compliance. In light of today's mobile phone market diversity, this thesis extends the solution proposed by WSRF-ME to non-Java ME phones and to Android devices in particular. Android-based device numbers have grown considerably over the past couple of years despite its recent creation and reduced availability of mature software tools. / Therefore, Android's web service capabilities are studied and the original framework is analyzed in order to propose a modified framework version that achieves and documents WSRF compliant communication form Android for the first time. As a case study, an illustrative mobile File Explorer application is developed to match the mod framework' functionality to the original WSRF-ME's use case. An additional case study, the LIGO Monitor application, shows the viability of mobile web services for monitoring purposes in the Laser Interferometer Gravitational Observatory (LIGO) grid environment for the first time. The context that an actual application implementation such as LIGO provides, allows some of the challenges of real mobile grid clients to surface. As a result, the observations made during this development give way to the drafting of a preliminary set of guidelines for Globus service implementation suitable for Android consumption that still remain open for proof in future works. / by Adriana Garcia-Kunzel. / Thesis (M.S.C.S.)--Florida Atlantic University, 2010. / Includes bibliography. / Electronic reproduction. Boca Raton, Fla., 2010. Mode of access: World Wide Web.

Controlling the cooperative behaviors of a fleet of autonomous underwater vehicles in a stochastic, complex environment is a formidable challenge in artificial intelligence. The complexity arises from the challenges of limited navigation and communication capabilities of underwater environment. A time critical cooperative operation by acoustic networks of Multiple Cooperative Vehicles (MCVs) necessitates a robust task allocation mechanism and an efficient path planning model. In this work, we present solutions to investigate two aspects of the cooperative schema for multiple underwater vehicles under realistic underwater acoustic communications: a Location-aided Task Allocation Framework (LAAF) algorithm for multi-target task assignment and a mathematical programming model, the Grid-based Multi-Objective Optimal Programming (GMOOP), for finding an optimal vehicle command decision given a set of objectives and constraints. We demonstrate that, the location-aided auction strategies perform significantly better than the generic auction algorithm in terms of effective task allocation time and information bandwidth requirements. In a typical task assignment scenario, the time needed in the LAAF algorithm is only a fraction compared to the generic auction algorithm. On the other hand; the GMOOP path planning technique provides a unique means for multi-objective tasks by cooperative agents with limited communication capabilities. Under different environmental settings, the GMOOP path planning technique is proved to provide a method with balance of sufficient expressive power and flexibility, and its solution algorithms tractable in terms of mission completion time, with a limited increase of overhead in acoustic communication. Prior to this work, existing multi-objective action selection methods were limited to robust networks where constant communication available. / The dynamic task allocation, together with the GMOOP path planning controller, provides a comprehensive solution to the search-classify tasks for cooperative AUVs. / by Yueyue Deng. / Thesis (Ph.D.)--Florida Atlantic University, 2010. / Includes bibliography. / Electronic reproduction. Boca Raton, Fla., 2010. Mode of access: World Wide Web.

Channel assignment in multi-radio networks is a topic of great importance because the use of multiple channels and multiple radios reduces interference and increases the network throughput. The goal of our research is to design algorithms that maximize the use of available resources while providing robustness to primary users that could reclaim one or more channels. Our algorithms could be used in ad hoc networks, mesh networks, and sensor networks where nodes are equipped with multiple radios. We design algorithms for channel assignment which provide robustness to primary users without assuming an accurate primary user behavior model. We also compute bounds for capacity in grid networks and discuss how the capacity of a network changes when multiple channels are available. Since preserving energy is very important in wireless networks, we focus on algorithms that do not require powerful resources and which use a reduced number of messages. / Includes bibliography. / Dissertation (Ph.D.)--Florida Atlantic University, 2015. / FAU Electronic Theses and Dissertations Collection

O consumo de dados em dispositivos móveis cresce em taxas que dobram a cada ano. Tal crescimento demonstra como os dispositivos móveis ganham importância e como eles têm sido usados no dia a dia da população. Entretanto, o acesso à Internet ainda possui alto custo e nem sempre está disponível. Esse cenário apresenta o desafio de mantermos o uso dos dispositivos móveis acessível e viável, mesmo quando a Internet não esteja disponível. A comunicação direta entre os dispositivos é vista como alternativa para comunicação sem Internet e, consequentemente, para a redução do tráfego de dados nas redes de celulares. Além disso, ela pode ser útil para manter os dispositivos comunicando entre si mesmo desconectados da Internet. O protocolo Wi-Fi Direct (WD) é uma referência para esse tipo de comunicação, uma vez que seu protocolo não demanda infraestrutura de rede pré-estabelecida para que a comunicação aconteça e utiliza hardware padrão para comunicação Wi-Fi. Apesar dessas vantagens, seu uso é pouco difundido, o que o torna desconhecido pelos usuários, sendo uma das possíveis causas a complexidade de uso. De forma diferente, a conexão com a Internet, que acontece de forma quase espontânea, no WD as partes envolvidas precisam se envolver ativamente, na escolha e autorização, para que a conexão seja estabelecida. A complexidade da comunicação entre dispositivo pode ser constatada quando os usuários utilizam a Internet para enviar dados mesmo que o dispositivo alvo esteja ao lado da origem. Para superar esse obstáculo, a conexão entre os dispositivos deve ser tão ou mais simples do que a ação de enviar um e-mail ou uma mensagem instantânea usando a Internet. Para lidar com esse cenário, este trabalho propõe uma alternativa para comunicação entre dispositivos próximos que não demanda autorização manual prévia a cada conexão com um dispositivo, e que, ainda assim, permita que o usuário decida se quer ou não usar os dados transmitidos por uma conexão. Para isso definimos uma arquitetura que possibilite a conexão e transferência de dados entre os dispositivos próximos sem a necessidade de intervenção prévia do usuário e implementamos o conceito proposto no sistema operacional para dispositivos móveis Android / The consumption data on mobile devices is growing at rates double every year. This growth demonstrates how mobile devices gain importance and how they have been used in everyday life of the population. However, the internet also has high cost and is not always available. This scenario presents the challenge of maintaining the use of affordable and viable mobile devices even when the Internet is not available. Direct communication between the devices is regarded as no alternative for internet communication and, consequently, to reduce the data traffic in cellular networks. Furthermore, it can be useful to keep the devices communicating among themselves disconnected from the Internet. The Wi-Fi Direct (WD) protocol is a reference to this type of communication, since its protocol does not require pre-established network infrastructure for communication to happen and uses standard hardware for Wi-Fi communication. Despite these advantages, its use is not widespread, making it unknown to the users, one of the possible causes of the complexity of use. Differently, the connection to the Internet, which happens almost spontaneously, the WD parties need to engage actively in the selection and authorization for the connection to be established. The complexity of communication between device can be found when users use the Internet to send data even if the target device is adjacent to the source. To overcome this obstacle, the connection between the devices should be as or more simple than the action of sending an email or an instant message using the Internet. To handle this scenario, this paper proposes an alternative for communication between nearby devices that does not require prior manual authorization for each connection to a device, and that still allow the user to decide whether or not to use the data transmitted by a connection. For this we define an architecture that enables the connection and data transfer between nearby devices without the need for prior user intervention and implement the concept proposed in the Android operating system for mobile devices

This mixed methods study examined secondary teachers’ technology selfefficacy, their professional development activities regarding mobile handheld devices, and how those activities affect their use of mobile devices as instructional tools. Additionally, this study also explored teachers’ perceptions of other factors that act as barriers or enablers to their use of such devices. The study included 104 middle and high school teachers who taught in a large, urban public school district in the Southeastern United States. Data were collected through the administration of an electronic survey and semi-structured interviews. The researcher utilized multiple regression and moderator analyses, as well as qualitative analysis of the interview data. The results of the multiple regression analysis revealed teachers’ technologyrelated self-efficacy to be a significant predictor of their instructional use of mobile handheld devices. However, secondary teachers’ level of professional development was found not to contribute significantly to the model. The moderator analysis too revealed professional development to be a nonsignificant factor. The findings of the qualitative phase of the study revealed secondary teachers’ awareness of their varied and fluid technology-related self-efficacy, as well as those factors that modify it. Qualitative data also revealed four categories of essential elements that teachers must have in order to most effectively implement mobile handheld devices within their pedagogy: intellectual capital, emotional capital, social-cultural capital, and technological capital. When lacking, these elements can represent barriers to teachers’ implementation of mobile handheld devices. Targeted professional development and increased funding to minimize the digital divide are recommended to reduce these barriers. The findings of the study inform designers of professional development programs, school and district and secondary teachers, as they are all stakeholders in the process of increasing the effective implementation of mobile handheld devices as instructional tools. / Includes bibliography. / Dissertation (Ph.D.)--Florida Atlantic University, 2016. / FAU Electronic Theses and Dissertations Collection

While new technologies are often used to facilitate regular people's lives, they often fail to see their potential in helping disabled people. Augmented reality, one of the newest state-of-the-art technologies, offers users the opportunity to add virtual information to their real world surroundings in real time. It also has the potential to not only augment the sense of sight, but also other senses such as hearing. Augmented reality could be used to offer the opportunity to complement users' missing sense. In this thesis, we study augmented reality technologies, systems and applications, and suggest the future of AR applications. We explain how to integrate augmented reality into iOS applications and propose an augmented reality application for hearing augmentation using an iPad2. We believe mobile devices are the best platform for augmented reality as they are widespread and their computational power is rapidly growing to be able to handle true AR applications. / by Julie Carmigniani. / Thesis (M.S.C.S.)--Florida Atlantic University, 2011. / Includes bibliography. / Electronic reproduction. Boca Raton, Fla., 2011. Mode of access: World Wide Web.

Media literacy is a competency needed for success in the 21st century yet a clear purpose does not exist that is useful in curriculum design. The purpose of this study was to investigate a combined (eclectic) approach to media literacy education according to selected international media literacy organizations. Determining an eclectic approach from subject area experts will be useful in designing and integrating media literacy curriculum. Methodologically, this study was a qualitative content analysis and is thematic in nature using a constant comparative method of analysis. Supporting frameworks were established through standards based curriculum development and Schwab’s (1969, 1971, 1973, 1983) ideas of practical deliberation. Purposive heterogeneous sampling was utilized in identifying media literacy organizations from countries considered leaders in media education. This included organizations from Australia, Canada, and the United Kingdom. The primary approaches throughout all identified countries include an arts, critical, literacy, protectionist, and tool approach to media literacy. Through the process of curriculum deliberation, it is necessary to reconcile these approaches into one eclectic approach. Although individual subject areas may focus on one approach, it is important to consider all approaches equally during curriculum deliberation. In comparing an eclectic approach to Florida language arts standards (modeled after the Common Core State Standards), it was discovered that an eclectic approach to media literacy is not present. These standards focus almost exclusively on a literacy approach despite state statue requiring the full integration of media literacy. Language arts standards also remain focused on print media despite acknowledging that students should be prepared for success in the 21st century. This is a media saturated world and every subject should implement media literacy principles and approaches that prepare students to succeed in it. / Includes bibliography. / Dissertation (Ph.D.)--Florida Atlantic University, 2016. / FAU Electronic Theses and Dissertations Collection

Este trabalho apresenta uma ferramenta de simulação computacional de canal de propagação para ambiente macro-celular baseada em modelos geométricos e no modelo estatístico apresentado no relatório COST 259 DCM. Para a implementação desta ferramenta é realizada, inicialmente, uma abordagem dos principais modelos de predição de perda por propagação, utilizados atualmente, assim como, um estudo dos modelos geométricos que fornecem as informações de distribuição de potência temporal e angular para diferentes tipos de distribuições estatísticas de espalhadores. A modelagem geométrica utiliza grupos independentes no qual os espalhadores são distribuídos com uma densidade Gaussiana. A utilização desta distribuição Gaussiana leva a distribuições de atraso e ângulo de chegada mais próximas dos resultados de medições do que o usando distribuição uniforme. A base geométrica define o conceito direcional e temporal. A base estatística define o número de grupo de espalhadores adicionais e suas localizações, quando estes existiram. Efeitos como: direção e potência de chegada de cada grupo de espalhadores, a presença ou não de visada direta entre transmissor e receptor a medida que a estação móvel percorre uma célula e a variação da polarização cruzada foram implementados nesse simulador. Desta forma, essa ferramenta computacional simula tanto a dispersão temporal, presente nos modelos de banda larga, como a dispersão angular, utilizadas em sistemas de comunicação móveis que exploram a diversidade espacial. / This work present a simulation tool for macro cell environment based on geometrical and statistical representation of the scatterers and on the COST 259 Directional Channel Model (DCM). A comprehensive review of the propagation prediction models for terrestrial wireless communication systems and geometric channel models, that provide, times of arrival (TOA) and the angle of arrival (AOA) for diferents statistics scatterers distribution is realized. This tool uses gaussianly distributed scatterers for each cluster. This distribution is naturally more realistic than the uniform distribution leading closer to experimental results. This geometrically based model simulates the TOA dispersion present in wide band channel models and the AOA dispersion necessary for systems that explore spatial diversity. This tool also incorporates the concept of line-of-sight and non-line-of-sight and its birth and death as the mobile station moves in a cell, as well as the appearance and disappearance of additional clusters of scatterers. The output provided by this simulation tool is comprised of all the complex amplitudes, delays and angles of arrival of all multipath components associated with each cluster of scatterers. Mean attenuation and slow fading effects are also incorporated to the model and fast fading appears as a consequence of the multipath interference.

by Wong Chun Kau, Jolly. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1992. / Includes bibliographical references (leaves 84-88). / ABSTRACT --- p.1 / ACKNOWLEDGEMENT --- p.3 / Chapter 1. --- INTRODUCTION --- p.7 / Chapter 1.1 --- Land Mobile Radio (LMR) Communications / Chapter 1.2 --- Paramilitary Communications Security / Chapter 1.3 --- Voice Scrambling Methods / Chapter 1.4 --- Digital Voice Encryption / Chapter 1.5 --- Digital Secure LMR / Chapter 2. --- DESIGN GOALS --- p.20 / Chapter 2.1 --- System Concept and Configuration / Chapter 2.2 --- Operational Requirements / Chapter 2.2.1 --- Operating conditions / Chapter 2.2.2 --- Intelligibility and speech quality / Chapter 2.2.3 --- Field coverage and transmission delay / Chapter 2.2.4 --- Reliability and maintenance / Chapter 2.3 --- Functional Requirements / Chapter 2.3.1 --- Major system features / Chapter 2.3.2 --- Cryptographic features / Chapter 2.3.3 --- Phone patch facility / Chapter 2.3.4 --- Mobile data capability / Chapter 2.4 --- Bandwidth Requirements / Chapter 2.5 --- Bit Error Rate Requirements / Chapter 3. --- VOICE CODERS --- p.38 / Chapter 3.1 --- Digital Speech Coding Methods / Chapter 3.1.1 --- Waveform coding / Chapter 3.1.2 --- Linear predictive coding / Chapter 3.1.3 --- Sub-band coding / Chapter 3.1.4 --- Vocoders / Chapter 3.2 --- Performance Evaluation / Chapter 4. --- CRYPTOGRAPHIC CONCERNS --- p.52 / Chapter 4.1 --- Basic Concepts and Cryptoanalysis / Chapter 4.2 --- Digital Encryption Techniques / Chapter 4.3 --- Crypto Synchronization / Chapter 4.3.1 --- Auto synchronization / Chapter 4.3.2 --- Initial synchronization / Chapter 4.3.3 --- Continuous synchronization / Chapter 4.3.4 --- Hybrid synchronization / Chapter 5. --- DIGITAL MODULATION --- p.63 / Chapter 5.1 --- Narrowband Channel Requirements / Chapter 5.2 --- Narrowband Digital FM / Chapter 5.3 --- Performance Evaluation / Chapter 6. --- SYSTEM IMPLEMENTATION --- p.71 / Chapter 6.1 --- Potential EMC Problems / Chapter 6.2 --- Frequency Planning / Chapter 6.3 --- Key Management / Chapter 6.4 --- Potential Electromagnetic Compatibility (EMC) Problems / Chapter 7. --- CONCLUSION --- p.80 / LIST OF ILLUSTRATIONS --- p.81 / REFERENCES --- p.82 / APPENDICES --- p.89 / Chapter I. --- Path Propagation Loss(L) Vs Distance (d) / Chapter II. --- Speech Quality Assessment Tests performed / by Special Duties Unit (SDU)

Ho Chi-Fong. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2000. / Includes bibliographical references (leaves 63-[64]). / Abstracts in English and Chinese. / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Introduction --- p.1 / Chapter 1.2 --- The 2.5G Systems --- p.3 / Chapter 1.2.1 --- HSCSD --- p.3 / Chapter 1.2.2 --- GPRS --- p.3 / Chapter 1.2.3 --- EDGE --- p.4 / Chapter 1.2.4 --- IS-136 --- p.4 / Chapter 1.3 --- The Evolution from 2G/2.5G to 3G --- p.4 / Chapter 1.3.1 --- GSM Data Evolution --- p.4 / Chapter 1.3.2 --- TDMA Data Evolution --- p.5 / Chapter 1.3.3 --- CDMA Data Evolution --- p.6 / Chapter 1.4 --- UTRA --- p.7 / Chapter 1.4.1 --- UTRA FDD --- p.8 / Chapter 1.4.2 --- UTRA TDD --- p.18 / Chapter 1.4.3 --- Transport Channels --- p.25 / Chapter 2 --- Spreading Factor Optimization for FDD Downlink --- p.27 / Chapter 2.1 --- The Optimal Channel Splitting Problem --- p.28 / Chapter 2.2 --- Spreading Factor Optimization for FDD Downlink Dedicated Chan- nel --- p.30 / Chapter 3 --- Random Access Channel Stability Control --- p.33 / Chapter 3.1 --- Random Access Slotted Aloha --- p.33 / Chapter 3.1.1 --- System model --- p.33 / Chapter 3.1.2 --- Probability of Code-Collision --- p.34 / Chapter 3.1.3 --- Throughput Analysis of Random Access in TD/CDMA System --- p.37 / Chapter 3.1.4 --- Retransmission --- p.42 / Chapter 3.1.5 --- System Delay --- p.42 / Chapter 3.2 --- Random Access Channel Stability Control --- p.43 / Chapter 3.2.1 --- System Model --- p.43 / Chapter 3.2.2 --- Random Access Procedure --- p.44 / Chapter 3.3 --- Random Access Channel Stability Control Alogrithm --- p.47 / Chapter 3.3.1 --- Simulation --- p.49 / Chapter 3.4 --- Multi-class Model --- p.55 / Chapter 4 --- Conclusions and Topics for Future Study --- p.60 / Chapter 4.1 --- Thesis Conclusions --- p.60 / Chapter 4.2 --- Future Work --- p.61 / Chapter 4.2.1 --- Downlink and Uplink resource allocation in TDD --- p.61 / Chapter 4.2.2 --- Resource Unit Packing in TDD --- p.62 / Chapter 4.2.3 --- Other Topics --- p.62 / Bibliography --- p.63