959 resultados para Digital Communication


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Information and communication technologies are the tools that underpin the emerging “Knowledge Society”. Exchange of information or knowledge between people and through networks of people has always taken place. But the ICT has radically changed the magnitude of this exchange, and thus factors such as timeliness of information and information dissemination patterns have become more important than ever.Since information and knowledge are so vital for the all round human development, libraries and institutions that manage these resources are indeed invaluable. So, the Library and Information Centres have a key role in the acquisition, processing, preservation and dissemination of information and knowledge. ln the modern context, library is providing service based on different types of documents such as manuscripts, printed, digital, etc. At the same time, acquisition, access, process, service etc. of these resources have become complicated now than ever before. The lCT made instrumental to extend libraries beyond the physical walls of a building and providing assistance in navigating and analyzing tremendous amounts of knowledge with a variety of digital tools. Thus, modern libraries are increasingly being re-defined as places to get unrestricted access to information in many formats and from many sources.The research was conducted in the university libraries in Kerala State, India. lt was identified that even though the information resources are flooding world over and several technologies have emerged to manage the situation for providing effective services to its clientele, most of the university libraries in Kerala were unable to exploit these technologies at maximum level. Though the libraries have automated many of their functions, wide gap prevails between the possible services and provided services. There are many good examples world over in the application of lCTs in libraries for the maximization of services and many such libraries have adopted the principles of reengineering and re-defining as a management strategy. Hence this study was targeted to look into how effectively adopted the modern lCTs in our libraries for maximizing the efficiency of operations and services and whether the principles of re-engineering and- redefining can be applied towards this.Data‘ was collected from library users, viz; student as well as faculty users; library ,professionals and university librarians, using structured questionnaires. This has been .supplemented by-observation of working of the libraries, discussions and interviews with the different types of users and staff, review of literature, etc. Personal observation of the organization set up, management practices, functions, facilities, resources, utilization of information resources and facilities by the users, etc. of the university libraries in Kerala have been made. Statistical techniques like percentage, mean, weighted mean, standard deviation, correlation, trend analysis, etc. have been used to analyse data.All the libraries could exploit only a very few possibilities of modern lCTs and hence they could not achieve effective Universal Bibliographic Control and desired efficiency and effectiveness in services. Because of this, the users as well as professionals are dissatisfied. Functional effectiveness in acquisition, access and process of information resources in various formats, development and maintenance of OPAC and WebOPAC, digital document delivery to remote users, Web based clearing of library counter services and resources, development of full-text databases, digital libraries and institutional repositories, consortia based operations for e-journals and databases, user education and information literacy, professional development with stress on lCTs, network administration and website maintenance, marketing of information, etc. are major areas need special attention to improve the situation. Finance, knowledge level on ICTs among library staff, professional dynamism and leadership, vision and support of the administrators and policy makers, prevailing educational set up and social environment in the state, etc. are some of the major hurdles in reaping the maximum possibilities of lCTs by the university libraries in Kerala. The principles of Business Process Re-engineering are found suitable to effectively apply to re-structure and redefine the operations and service system of the libraries. Most of the conventional departments or divisions prevailing in the university libraries were functioning as watertight compartments and their existing management system was more rigid to adopt the principles of change management. Hence, a thorough re-structuring of the divisions was indicated. Consortia based activities and pooling and sharing of information resources was advocated to meet the varied needs of the users in the main campuses and off campuses of the universities, affiliated colleges and remote stations. A uniform staff policy similar to that prevailing in CSIR, DRDO, ISRO, etc. has been proposed by the study not only in the university libraries in kerala but for the entire country.Restructuring of Lis education,integrated and Planned development of school,college,research and public library systems,etc.were also justified for reaping maximum benefits of the modern ICTs.

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The modern telecommunication industry demands higher capacity networks with high data rate. Orthogonal frequency division multiplexing (OFDM) is a promising technique for high data rate wireless communications at reasonable complexity in wireless channels. OFDM has been adopted for many types of wireless systems like wireless local area networks such as IEEE 802.11a, and digital audio/video broadcasting (DAB/DVB). The proposed research focuses on a concatenated coding scheme that improve the performance of OFDM based wireless communications. It uses a Redundant Residue Number System (RRNS) code as the outer code and a convolutional code as the inner code. The bit error rate (BER) performances of the proposed system under different channel conditions are investigated. These include the effect of additive white Gaussian noise (AWGN), multipath delay spread, peak power clipping and frame start synchronization error. The simulation results show that the proposed RRNS-Convolutional concatenated coding (RCCC) scheme provides significant improvement in the system performance by exploiting the inherent properties of RRNS.

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This paper presents a new approach to the design of combinational digital circuits with multiplexers using Evolutionary techniques. Genetic Algorithm (GA) is used as the optimization tool. Several circuits are synthesized with this method and compared with two design techniques such as standard implementation of logic functions using multiplexers and implementation using Shannon’s decomposition technique using GA. With the proposed method complexity of the circuit and the associated delay can be reduced significantly

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The rapid growth in high data rate communication systems has introduced new high spectral efficient modulation techniques and standards such as LTE-A (long term evolution-advanced) for 4G (4th generation) systems. These techniques have provided a broader bandwidth but introduced high peak-to-average power ratio (PAR) problem at the high power amplifier (HPA) level of the communication system base transceiver station (BTS). To avoid spectral spreading due to high PAR, stringent requirement on linearity is needed which brings the HPA to operate at large back-off power at the expense of power efficiency. Consequently, high power devices are fundamental in HPAs for high linearity and efficiency. Recent development in wide bandgap power devices, in particular AlGaN/GaN HEMT, has offered higher power level with superior linearity-efficiency trade-off in microwaves communication. For cost-effective HPA design to production cycle, rigorous computer aided design (CAD) AlGaN/GaN HEMT models are essential to reflect real response with increasing power level and channel temperature. Therefore, large-size AlGaN/GaN HEMT large-signal electrothermal modeling procedure is proposed. The HEMT structure analysis, characterization, data processing, model extraction and model implementation phases have been covered in this thesis including trapping and self-heating dispersion accounting for nonlinear drain current collapse. The small-signal model is extracted using the 22-element modeling procedure developed in our department. The intrinsic large-signal model is deeply investigated in conjunction with linearity prediction. The accuracy of the nonlinear drain current has been enhanced through several issues such as trapping and self-heating characterization. Also, the HEMT structure thermal profile has been investigated and corresponding thermal resistance has been extracted through thermal simulation and chuck-controlled temperature pulsed I(V) and static DC measurements. Higher-order equivalent thermal model is extracted and implemented in the HEMT large-signal model to accurately estimate instantaneous channel temperature. Moreover, trapping and self-heating transients has been characterized through transient measurements. The obtained time constants are represented by equivalent sub-circuits and integrated in the nonlinear drain current implementation to account for complex communication signals dynamic prediction. The obtained verification of this table-based large-size large-signal electrothermal model implementation has illustrated high accuracy in terms of output power, gain, efficiency and nonlinearity prediction with respect to standard large-signal test signals.

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Materials related to the session titled Digital Collector as part of the Research and Communication Skills

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La publicidad en una empresa suele ser la parte más costosa para promover el producto y además suele ser de gran impacto y corta duración o de poco impacto pero con una duración mayor. La publicidad tradicional es de fácil monitoreo, pero predecible en algunos casos, ya que su divulgación está ligada a quién y cómo se dirijan los esfuerzos de las marcas por dar a entender su idea principal. La razón de un negocio es vender y perdurar en el tiempo por lo que es fundamental tener una manera efectiva de dar el mensaje, mostrar y recordar un producto. La experiencia de compra y la experiencia de uso son aspectos decisivos en el momento de volver a comprar, pero aún más importante, es la fidelidad del individuo ya que puede producir un gran impacto en los otros consumidores que tienen en cuenta las opiniones de los demás compradores. La publicidad nos da un gran campo de acción e innovación, el cual debemos explotar de manera inteligente y estratégica, siendo claros a la hora de transmitir el mensaje y generando un estrecho canal de comunicación en el que no existan barreras que dificulten la comprensión del mensaje a transmitir. Es acá donde las empresas se dan cuenta que es fundamental conocer cuáles son los aspectos favorables al difundir información, como en este caso sería la gente bien relacionada en el eje central de las redes sociales que van a acoger un producto y promoverlo ampliamente entre las personas de su círculo social. Por esta razón decidimos escoger las redes sociales como la mejor estrategia digital para el nuevo lanzamiento de cremas corporales de la marca Hinds.

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Estudio de prefactibilidad para determinar si genera rentabilidad financiera por encima de la tasa de oportunidad de la empresa, el montaje y operación de 40 Puntos Vive Digital en la ciudad de Bogotá. Teniendo en cuenta los estudios de soporte tales como: entorno, mercado, técnico, administrativo, legal, financiero, económico-social. Para llevar a cabo dicho objetivo, la empresa deberá evaluar la posibilidad de presentarse a la convocatoria que lidera el Ministerio de Tecnologías de Información y las Comunicaciones (TIC), en el marco del Plan Vive Digital a través del Programa Compartel que promueve la creación de 320 Puntos Vive Digital para el año 2012. Por esta razón, la empresa contrató un formulador para estructurar el proyecto y servir como soporte de un proceso para la toma de decisiones en el escenario real de participar en la convocatoria del proyecto de Puntos Vive Digital del Ministerio de Tecnologías de Información y las Comunicaciones (TIC). Luego de finalizar dicha investigación, resultó recomendable para la empresa, participar en el Programa Plan Vive Digital, particularmente en el proyecto de Puntos Vive Digital, luego de constatar que genera riqueza a la empresa, contribuye en su plan estratégico 2012-2014, especialmente en ampliar su portafolio de servicios TIC de manera rentable y finalmente, cuenta con la experiencia de ejecutar este tipo de proyectos debido a la gran trayectoria en el montaje y operación de puntos de acceso masivo a internet en la ciudad.

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El siguiente documento contiene, en primer lugar la caracterización del sector de las Industrias Digitales, construida a partir de la recopilación de información, datos y estadísticas y basada en el contexto que presenta dicha industria, se presentan además diferentes teorías que permiten el entendimiento del desarrollo de iniciativas digitales desde un perspectiva académica dando peso a los argumentos planteados, dentro de estas se establece como fuente de investigación principal la planteada por Eric Ries quien presenta la metodología Lean Startup, base de la construcción del modelo que se construye como herramienta fundamental para dar soporte a la creación y ejecución de nuevas iniciativas para la industria, de forma que los interesados encuentren una manera sencilla y efectiva de volver tangible, útil y sostenible su idea acompañada de un soporte teórico y académico y permitiendo la disminución de la informalidad en el sector.

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Este trabajo de investigación tuvo como objetivo principal describir la construcción narrativa de las políticas públicas sobre tecnologías de la información en el gobierno de Juan Manuel Santos en los años 2012 y 2013 en la prensa de referencia en Colombia, específicamente en El Espectador y El Tiempo. Para alcanzar este objetivo la pregunta que se planteo fue ¿cómo está conformada la construcción narrativa del discurso de políticas públicas en la prensa sobre tecnologías de la información y comunicaciones? En consiguiente se hizo una organización de información referente al objeto de estudio, a través de un método de investigación empleado por Mary Jane Spink llamado líneas narrativas. El cual le permitió a la investigación la identificación de relatos, en donde se estudia la narrativa de una política TIC emergente y da como resultado líneas narrativas.

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El presente trabajo de investigación tiene como objetivo explicar el papel de las redes sociales en el proceso de conformación de la opinión pública en Colombia en el gobierno de Juan Manuel Santos. Lo que se quiere comprobar es que las redes sociales han ejercido un papel de herramienta configuradora de agendas en el gobierno de Juan Manuel Santos. Las antiguas formas de comunicación como las tertulias en los cafés y las discusiones cara a cara se han reemplazado por las conversaciones “online”, modificando así los procesos comunicativos entre los individuos y la forma de producir opinión pública. Para llevar a cabo esta investigación es pertinente desarrollar los conceptos de opinión pública, esfera pública y redes sociales; además de hacer uso de un método de recolección y análisis de información cualitativo con herramientas cuantitativas como las encuestas, estadísticas y gráficas.

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Resumen basado en el de la publicación

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Esta escrito para apoyar las nueva especificación Edexcel AS en las tecnologías de la información y la comunicación (ICT). Su contenido se estructura en tres unidades: la edad de la información; la economía digital; y el trabajador del conocimiento.

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Monográfico con el título: 'La Alfabetización Tecnológica y el desarrollo regional'. Resumen basado en el de la publicación

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The potential of digital interactive television (iDTV) to promote original services, formats and contents that can be relevant to support personal health care and wellness of individuals, namely elderly people, has not been yet fully explored in the past. Therefore, in a context of rapid change of the technological resources, in which the distribution and presentation of content comes associated with new platforms (such as digital terrestrial TV and IPTV), it is important to perceive the configurations that are being developed for interactive digital TV (iDTV) that may result in relevant outcomes within the field of healthcare and wellness, with the aim of offering complementarity to the existing services and contents made available today via the traditional means and media. This article describes and discusses the preliminary results of the first part of the research project iDTV-HEALTH: Inclusive services to promote health and wellness via digital interactive television. These first results suggest that iDTV solutions may represent a real contribution to delivery healthcare and wellness to the target population, namely as a supplement to health services provision.

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O tema central da presente tese por projeto é a Banda Desenhada, subdivisão da Arte Sequencial. O primeiro capítulo procura elencar as características que fazem com que a Banda Desenhada seja arte sequencial. O segundo capítulo propõe quatro tópicos que podem ser aplicados para que este tipo de Arte seja adaptável ao meio digital (principalmente para a rede mundial de computadores): formatos virtualmente impossíveis na obra impressa, som (ruídos e música), interatividade e movimento. O terceiro capítulo descreve todo o processo realizado (o método escolhido não é o único possível) para a criação e produção de um protótipo que apresenta uma dessas características: movimento.