With the rapid adoption of multimedia network technologies, a number of companies and standards bodies are introducing technologies that enhance user experience in networked multimedia environments. These technologies focus on device discovery, connection management, control, and monitoring. This study focused on control and monitoring. Multimedia networks make it possible for devices that are part of the same network to reside in different physical locations. These devices contain parameters that are used to control particular features, such as speaker volume, bass, amplifier gain, and video resolution. It is often necessary for changes in one parameter to affect other parameters, such as a synchronised change between volume and bass parameters, or collective control of multiple parameters. Thus, relationships are required between the parameters. In addition, some devices contain parameters, such as voltage, temperature, and audio level, that require constant monitoring to enable corrective action when thresholds are exceeded. Therefore, a mechanism for monitoring networked devices is required. This thesis proposes relationships that are essential for the proper functioning of a multimedia network and that should, therefore, be incorporated in standard form into a protocol, such that all devices can depend on them. Implementation mechanisms for these relationships were created. Parameter grouping and monitoring capabilities within mixing console implementations and existing control protocols were reviewed. A number of requirements for parameter grouping and monitoring were derived from this review. These requirements include a formal classification of relationship types, the ability to create relationships between parameters with different underlying value units, the ability to create relationships between parameters residing on different devices on a network, and the use of an event-driven mechanism for parameter monitoring. These requirements were the criteria used to govern the implementation mechanisms that were created as part of this study. Parameter grouping and monitoring mechanisms were implemented for the XFN protocol. The mechanisms implemented fulfil the requirements derived from the review of capabilities of mixing consoles and existing control protocols. The formal classification of relationship types was implemented within XFN parameters using lists that keep track of the relationships between each XFN parameter and other XFN parameters that reside on the same device or on other devices on the network. A common value unit, known as the global unit, was defined for use as the value format within value update messages between XFN parameters that have relationships. Mapping tables were used to translate the global unit values to application-specific (universal) units, such as decibels (dB). A mechanism for bulk parameter retrieval within the XFN protocol was augmented to produce an event-driven mechanism for parameter monitoring. These implementation mechanisms were applied to an XFN-protocol-compliant graphical control application to demonstrate their usage within an end user context. At the time of this study, the XFN protocol was undergoing standardisation within the Audio Engineering Society. The AES-64 standard has now been approved. Most of the implementation mechanisms resulting from this study have been incorporated into this standard.

La stéganographie est l’art de la dissimulation de l’information secrète dans un médium donné (cover) de sorte que le médium résultant (stégo) soit quasiment identique au médium cover. De nos jours, avec la mondialisation des échanges (Internet, messagerie et commerce électronique), s’appuyant sur des médiums divers (son, image, vidéo), la stéganographie moderne a pris de l’ampleur. Dans ce manuscrit, nous avons étudié les méthodes de stéganographie LSB adaptatives, dans les domaines spatial et fréquentiel (DCT, et DWT), permettant de cacher le maximum d’information utile dans une image cover, de sorte que l’existence du message secret dans l’image stégo soit imperceptible et pratiquement indétectable. La sécurité du contenu du message, dans le cas de sa détection par un adversaire, n’est pas vraiment assurée par les méthodes proposées dans la littérature. Afin de résoudre cette question, nous avons adapté et implémenté deux méthodes (connues) de stéganographie LSB adaptatives, en ajoutant un système chaotique robuste permettant une insertion quasi-chaotique des bits du message secret. Le système chaotique proposé consiste en un générateur de séquences chaotiques robustes fournissant les clés dynamiques d’une carte Cat 2-D chaotique modifiée. La stéganalyse universelle (classification) des méthodes de stéganographie développées est étudiée. A ce sujet, nous avons utilisé l’analyse discriminante linéaire de Fisher comme classifieur des vecteurs caractéristiques de Farid, Shi et Wang. Ce choix est basé sur la large variété de vecteurs caractéristiques testés qui fournissent une information sur les propriétés de l’image avant et après l’insertion du message. Une analyse des performances des trois méthodes de stéganalyse développées, appliquées sur des images stégo produites par les deux méthodes de stéganographie LSB adaptatives proposées, est réalisée. L’évaluation des résultats de la classification est réalisée par les paramètres: sensibilité, spécificité, précision et coefficient Kappa. / Steganography is the art of the dissimulation of a secret message in a cover medium such that the resultant medium (stego) is almost identical to the cover medium. Nowadays, with the globalization of the exchanges (Internet, messaging and e-commerce), using diverse mediums (sound, embellish with images, video), modern steganography is widely expanded. In this manuscript, we studied adaptive LSB methods of stéganography in spatial domain and frequency domain (DCT, and DWT), allowing of hiding the maximum of useful information in a cover image, such that the existence of the secret message in the stégo image is imperceptible and practically undetectable. Security of the message contents, in the case of its detection by an opponent, is not really insured by the methods proposed in the literature. To solve this question, we adapted and implemented two (known) methods of adaptive stéganographie LSB, by adding a strong chaotic system allowing a quasi-chaotic insertion of the bits of the secret message. The proposed chaotic system consists of a generator of strong chaotic sequences, supplying the dynamic keys of a modified chaotic 2D Cat map. Universal steganalysis (classification) of the developed methods of stéganography, is studied. On this question, we used the linear discriminating analysis of Fisher as classifier of the characteristic vectors of Farid, Shi and Wang. This choice is based on the wide variety of tested characteristic vectors that give an information about the properties of the image before and after message insertion. An analysis of the performances of three developed methods of steganalysis, applied to the produced stego images by the proposed adaptive methods of stéganography, is realized. Performance evaluation of the classification is realized by using the parameters: sensibility, specificity, precision and coefficient Kappa.

The promise of Wireless Sensor Networks (WSNs) is the autonomous collaboration of a collection of sensors to accomplish some specific goals which a single sensor cannot offer. Basically, sensor networking serves a range of applications by providing the raw data as fundamentals for further analyses and actions. The imprecision of the collected data could tremendously mislead the decision-making process of sensor-based applications, resulting in an ineffectiveness or failure of the application objectives. Due to inherent WSN characteristics normally spoiling the raw sensor readings, many research efforts attempt to improve the accuracy of the corrupted or “dirty” sensor data. The dirty data need to be cleaned or corrected. However, the developed data cleaning solutions restrict themselves to the scope of static WSNs where deployed sensors would rarely move during the operation. Nowadays, many emerging applications relying on WSNs need the sensor mobility to enhance the application efficiency and usage flexibility. The location of deployed sensors needs to be dynamic. Also, each sensor would independently function and contribute its resources. Sensors equipped with vehicles for monitoring the traffic condition could be depicted as one of the prospective examples. The sensor mobility causes a transient in network topology and correlation among sensor streams. Based on static relationships among sensors, the existing methods for cleaning sensor data in static WSNs are invalid in such mobile scenarios. Therefore, a solution of data cleaning that considers the sensor movements is actively needed. This dissertation aims to improve the quality of sensor data by considering the consequences of various trajectory relationships of autonomous mobile sensors in the system. First of all, we address the dynamic network topology due to sensor mobility. The concept of virtual sensor is presented and used for spatio-temporal selection of neighboring sensors to help in cleaning sensor data streams. This method is one of the first methods to clean data in mobile sensor environments. We also study the mobility pattern of moving sensors relative to boundaries of sub-areas of interest. We developed a belief-based analysis to determine the reliable sets of neighboring sensors to improve the cleaning performance, especially when node density is relatively low. Finally, we design a novel sketch-based technique to clean data from internal sensors where spatio-temporal relationships among sensors cannot lead to the data correlations among sensor streams.

Orientador: Vera Regina Toledo Camargo / Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Estudos da Linguagem / Made available in DSpace on 2018-08-27T07:48:48Z (GMT). No. of bitstreams: 1 Pereira_MarcosRogerio_M.pdf: 9331268 bytes, checksum: 83a33eacaa5b46e2776300a967e6c32d (MD5) Previous issue date: 2014 / Resumo: Este estudo é vinculado ao projeto científico "Geração de cenários de produção de álcool como apoio para a formulação de políticas públicas aplicadas à adaptação do setor sucroalcooleiro nacional às mudanças climáticas". Seu objetivo é produzir e divulgar informações científicas para públicos distintos sobre o tema das mudanças climáticas no âmbito da internet. O estudo se justifica graças à sua relevância, no universo digital, como canal de difusão de informação e de conhecimento na vida contemporânea. Enquanto em um primeiro momento enfatiza o uso de sites, blogs e redes sociais on-line para compartilhar ciência, permitindo identificar o público-alvo e, consequentemente, atraindo novos pesquisadores e interessados nas mudanças climáticas e seus impactos, o segundo aborda a criação de um site como horizonte de ação para tornar a informação acessível ao maior número de pessoas possível. A introdução de temas científicos na web requer estudo, compreensão e análise do conteúdo quanto à propagação das informações resultantes desse projeto científico. Considerando que o objeto da pesquisa é como usar a sociedade em rede para transmitir conhecimento, enfatizam-se as principais características deste trabalho: recuperar informações acessíveis e detalhadas geradas pela equipe científica, fatos recentes e de grande repercussão sobre temas de interesse do público-alvo do projeto e difundi-los na rede. De forma sistemática, este estudo mapeou o processo de divulgação científica mediado pelas tecnologias de comunicação e informação. Além do uso em conjunto das redes sociais on-line e o emprego de estratégias de divulgação científica que foram exploradas como tentativa de transmitir e promover amplo acesso ao conhecimento gerado pelos pesquisadores, os principais resultados do trabalho foram o aprimoramento e análise das informações científicas colocadas à disposição do público na web, e as estratégias empregadas para favorecer o acesso ao conhecimento gerado pelo projeto, além do site que foi desenvolvido com recursos técnicos de acessibilidade, usabilidade e design responsivo e que serviu de base para preservar e divulgar o conteúdo científico produzido pelo projeto de pesquisa. Os resultados visam contribuir com a circulação da informação científica na internet e tornar acessíveis artigos, dissertações, teses, entrevistas, vídeos, áudios, textos, fotos, imagens, matérias jornalísticas e informações sobre eventos científicos no contexto das mudanças climáticas. A expectativa é que o uso da internet possa levar as pessoas a identificar os posicionamentos que sustentam os estudos sobre o tema e estimule outras leituras que auxiliem na tomada de decisões sobre o mundo contemporâneo e as mudanças, que nele acontecem, causadas pela atividade humana / Abstract: This research is linked to the scientific project in global climate changes "Generation of Alcohol Production Scenarios as Support for the Formulation of Public Policies Applied to the Adaptation of the National Sugar and Alcohol Industry to the Climate Changes". Its aim is to focus more extensive disclosures, for different audiences, on the topic of global climate changes within the internet. This study is justified by its relevance as a channel for diffusion of information and knowledge of contemporary life. It emphasizes, in the first place, how the use of sites, blog and digital social networks, as science communication platforms, serves to identify the target audience and hence attracting new researchers and stakeholders on climate change and its impacts. Still at the process of adjustment to social networks and medias, the introduction of scientific subjects on those networks demands studies, comprehension and analyses of the content in relation to the spread of information and knowledge resulting of this scientific project. When the object of the research is "how to use the network society" to impart knowledge, it is emphasized that the main features of the work are: to recover accessible and detailed information generated by the scientific staff, to retrieve recent and highly publicized events on topics of interest to the target audience of the project and spread them online. Systematically, the purpose of this study was to map the process of scientific dissemination mediated by communication and information technologies. Besides the use of digital social network together with scientific dissemination strategies that have been explored as attempts of conveying and promoting a broad access to the knowledge generated by the researchers, the main results of the work were the improvement and analyses of the scientific information made available to public on the web, and the strategies employed to facilitate access to knowledge generated by the project, together with the website, that was developed with technical features of accessibility, usability and responsive design and that has been the basis for preserving and disclosing the scientific and technological content produced by the research. And, more broadly, contribute to the circulation of scientific information on the Internet and make available papers, dissertations, theses, interviews, videos, audios, texts, photos, newspaper articles and images, information and news about national and international scientific events in context of climate change. The expectation is that the use of the internet can lead users to identify positions that support the studies on the subject and stimulate other readings that help in making decisions about the contemporary world and the changes that happen in it, caused by human activity / Mestrado / Divulgação Científica e Cultural / Mestre em Divulgação Científica e Cultural

Orientador: Yuzo Iano / Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação / Made available in DSpace on 2018-08-27T10:10:17Z (GMT). No. of bitstreams: 1 Caetano_DiogoGara_D.pdf: 7750727 bytes, checksum: ce4a919f974ece2e4f79e734c8c7fd63 (MD5) Previous issue date: 2015 / Resumo: Esse trabalho inicialmente faz uma análise da evolução dos sistemas de comunicações digitais, enfatizando a evolução dos sistemas DTV (Digital TV) e explora através de aplicações, os conceitos de IoT (Internet of Things), computação em nuvem, mineração de dados, big data e rádios cognitivos, propondo o uso de redes de sensores e banco de dados para uma diversidade de aplicações relacionadas ao uso do espectro de frequências, entre elas: o sensoriamento do espectro, a medição da qualidade de sinais ao longo do tempo, a estatística de audiência e a detecção dos modelos de propagação mais adequados para cada região. Na proposta, a medição de qualidade dos sinais de radiodifusão é realizada por sensores em campo e a interface gráfica é realizada através de Web Map Services, possibilitando a filtragem das informações por tipo de medida, área e período de interesse. Distribui-se o processamento de dados entre servidores e máquinas locais para o melhor desempenho das aplicações. Para o sensoriamento, aplica-se o conceito de IoT ao se propor a conversão de receptores comerciais convencionais como Set-Top-Boxes e smartphones em sensores de qualidade de sinais, considera-se esse método como uma solução viável para a composição de redes com centenas a milhares de sensores. Os sensores ao ganharem a capacidade de varrer o espectro de frequências de forma automática, são também considerados como rádios cognitivos em sistemas DTV. Devido à atual preocupação das agências reguladoras em buscar soluções para a melhor gestão e compartilhamento do espectro, propõe-se dessa forma, uma solução baseada em sensores de baixo custo e banco de dados que possam atuar na gestão do uso das frequências e, consequentemente possibilite uma série de análises quantitativas e qualitativas dos sinais eletromagnéticos / Abstract: This thesis initially analyses the evolution of digital communications, emphasizing the evolution of DTV systems (Digital TV), and, through software applications, explores the concepts of IoT (Internet of Things), cloud computing, data mining, big data and cognitive radios, when proposing the use of sensor networks and databases for a variety of applications related to the use of frequency spectrum, among them, spectrum sensing, measurement of signal quality over time, processing of collected data and its comparison with signal propagation models. We propose the measurement of broadcasting signal quality through low cost field sensors and the use of Web Map Services as a user interface, enabling the data filtering by type of measurement, area and period of interest. The data is processed by servers and local machines for improvement of applications performance. Following the concept of IoT, we propose the conversion of conventional commercial receivers, such as Set-Top-Boxes and smartphones into signal field sensors. This solution is considered a viable solution for the composition of networks with hundreds to thousands of sensors. As the devices incorporates capacity of frequency spectrum scanning capabilities, the proposed method can also be considered an application of cognitive radio system in DTV. Due to the concern of regulatory agencies in seeking solutions for better spectrum management and sharing among different systems, we propose a solution based on low-cost sensors and databases, which can act in the management of the frequency spectrum and therefore enable a series of quantitative and qualitative analyzes of radio signals / Doutorado / Telecomunicações e Telemática / Doutor em Engenharia Elétrica

This project, Database Access through the Web (DAW), implements a database to store academic and general information of graduate students in the Department of Computer Science, CSUSB and provides access to the database from the web. The motivation of the project comes from needs of the Graduate Coordinator, professors and department staff to access through the Internet student information concurrently.

This project was created using ColdFusion 4.5 to build and implement a commercial web site to present a real picture of electronic commerce. This project is intended to provide enough information for other students who are looking for a guideline for further study and to improve their skills in business from an information management aspect.

The purpose of Presentations World Wide System (PWWS) is to allow students to view a live presentation through an Internet browser and allow the instructor to have control over the presentation.

The scope of this project describes World Wide Graphics (WWG) a software package that provides instructors with the tools needed to present a web-based presentation to a group of students while having the ability of enhancing the prepared HTML slide with userdrawn graphics and highlighting.

Wireless is an important part of the future and utilizing the wireless technology in project management is a great tool. This project is a messaging system designed using WAP and Java Server pages, as both of them are the technologies of the future. The project puts together a tool to help in project management made with the use of Java Server Pages and MySQL as the backend database. It uses Wireless Markup Language as the basic language for the cellular phones and the hand held wireless devices. The prototype has been modeled on project planning for power plants done by Asea Brown Boveri, Ltd.