für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Providing delay guarantees to time-sensitive multimedia traffic in future wireless networks is a challenging problem. This is due to the time-varying link capacities and the variety of real-time applications expected to be handled by such networks. Multiuser diversity schemes that exploit the variations in the users` channel conditions offer orders of magnitude increase in the performance of wireless systems. This book addresses the problem of channel-aware scheduling of delay bounded traffic for two different wireless network models: Time Division Multiple Access (TDMA) and Orthogonal Frequency Division Multiple Access (OFDMA) broadband wireless networks. A unique feature of this work is the explicit provisioning of statistical QoS while enhancing fairness in data rates, delay bounds, and delay bound violations. We provide extensive simulation results to show the different performance aspects of the proposed schemes. ····· 1036198428
····· lezzter Preis 49.90€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Digital Steganography is the process of hiding a message in a cover signal. This book shows the various technique available for hiding text data in a speech signal. The process of hiding digital data(such as speech, text, and image) in a Speech Signal is called Speech Steganography. This book i have also discusses the differences between Steganography, Digital Watermarking and Cryptography dealing with a Speech Signal. ····· 1036192630
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Next generation wireless and mobile cellular networks are expected to support multimedia applications with different quality of service (QoS). User mobility and time-varying multipath fading of wireless channels make QoS provisioning a challenging issue in wireless and mobile networks. In order to provide service differentiation and QoS guarantee in such networks, many new technologies have been proposed. Wideband code division multiple access (WCDMA) is the major multiple access technology for the third generation (3G) and beyond mobile communication systems. One major challenge in multimedia services over WCDMA-based networks is QoS provisioning with efficient resource utilization. The allocation and management of radio resources are crucial for such networks, where the scarce wireless spectrum resources are shared by multiple users. On the other hand, in the standard layered networking architecture, each layer is designed and operated independently. However, wireless channels suffer from both interference and inherent instability moreover, the statistical channel characteristics of different users are different. ····· 1036192585
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The system specifically tailored to the detection of web-based attacks, taking advantage of application-specific correlation between server-side programs and parameters used in their invocation. Ideally, the system will not require any installation- specific configuration and learns all query characteristics from training data, even though the level of sensitivity to anomalous data can be configured via thresholds to suit different site policies ····· 1036192422
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray With the advent of new sophisticated terminals and bandwidth-demanding services, system designers are pushed towards the challenge of enhancing system spectral efficiency and providing homogeneous coverage for cellular networks. Although next generation standards are already considering mature enabling technologies (like multiple-input multiple-output, MIMO, or full frequency reuse planning), more efficient wireless technologies and novel deployment concepts are needed to deal with the demanding traffic growth expected in the near future. In this regard, we investigate how to take advantage of two promising transmission technologies and deployments: coordinated multipoint and heterogeneous networks (where base stations, relay stations and femto access points can coexist). ····· 1036192280
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray This study sought to investigate the effectiveness of the rebranding a strategy in the mobile communications industry with Net One as a case study. To help in the execution of this project, the researcher set out five main objectives. These were to identify reasons that necessitated re-branding to find out whether Net One s rebranding strategy is in line with clients needs to assess the clients perceptions in the past and present logo changes to identify the benefits of re-branding that accrues to the organization and to assess resource allocation of the rebranding exercise to the organization. To accomplish the objectives of the research project, the researcher used the case study research design. This uses two broad types of research namely qualitative and quantitative. As for the data collection, the researcher elected to use the self administered questionnaire. A total of 56 questionnaires were distributed to staff, middle managers and clients. Interviews were also done with managers. To analyze collected data, the research assessed all data with some good measure of the objectivity. This was done through the use of tables, pie charts and graphs.. ····· 1036192257
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray This Book is a Performance Evolution of two wireless Protocols (MAC Protocols), The first is the Wireless IEEE-802.11e Enhanced Distributed Channel Access (EDCA) protocol which supports the Quality of Service (QoS) and the other is the Wireless IEEE-802.11 Distributed Coordination Function (DCF) Protocol which does not support Quality of Service. Two Types of wireless Configurations were used, the first is Mobile ad-hoc wireless network and the other is the Access point (AP) wireless network. An Environment of variable number of nodes was established, certain nodes were specified as a transmitted nodes and the rest considered as a receiving nodes. NS2 (Network Simulator version 2) was used to achieve the simulation part of the project, a TCL (Tool Control Language) scripting language and NAM (Network Animator) were used also. The comparisons of results are made in terms of Packet loss, Packet Delivery, and Packet Turn Around Time. A conclusion was drawn from the results to approve that EDCA protocol outperforms DCF protocol. This book can be considered as a complete practical book, it will guide you to achieve a complete wireless ad hoc simulation projects. ····· 1036192175
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Wi-Fi, WiMAX technologies are working both in standalone and integrated environments, to improve handover performance, mobility management, QoS, security and etc. Power save management is biggest issues with sleep and idle modes. When mobile node (MN) enter into idle state, it must perform location update, idle nodes is identified by different methods. The main disadvantage of Wi-Fi, WiMAX integrated environment is that, the both technologies perform individual/standalone idle modes managements. Whenever MN joining its home network performs all the authentication procedures even in power save mode, which causes network burden, overhead and delay. In idle mode management when MN frequently changes it s states between active and idle mode in both technologies, authentication and location update messages are perform every change, during this activity it s may be small switching but causes network overhead and reduces network performance as mobile node does not changes its location or paging group for the registration to access network services. This book provided suitable answers regrinding idle mode with authentication for Wi-Fi, WiMAX Integrated System. ····· 1036192119
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray A comprehensive study and a large set of simulation tests were carried out to analyze the characteristics of packet-switched networks that cannot guarantee the capacity. In this dissertation, such networks are referred to as non-bitrate-guaranteed mobile networks . This study revealed several key problems including: data transfer gaps caused by cell reselection, bandwidth fluctuation caused by either signal quality or cell load, streaming client buffer underflow and limited capability of the streaming client to report these problems to the streaming server. Novel solutions to these problems are proposed in this thesis. In addition to these service issues, this thesis evaluated subjective quality thresholds of lip synchronization and video. It is equally important, compared to technical improvements, to understand whether the improvement give subjective benefits. For example, increased bitrate improves the video/audio quality of streaming service, but the device hardware may become limiting factor that improvements are no longer noticed. ····· 1036192105
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Cloud computing promises a new era of service delivery and deployment in such a way that every person can access any kind of service from anywhere, anytime, using any device having internet connection. Sustainability of Cloud computing is to be addressed in terms of environmental and economic aspects. In this book we explore the energy efficient approaches inside data centres from the site and IT infrastructure perspective incorporating Cloud networking from the access network technologies and network equipment point of view to give a comprehensive prospect toward achieving energy efficiency of Cloud computing. Traditional and Cloud data centres would be compared to figure out which one is more reliable. Virtualization as heart of energy efficient Cloud computing has been introduced briefly. Finally approaches for Cloud computing data centres at operating system and especially data centre level are presented and Green Cloud architecture as the most suitable green approach is described in details. In the experiment segment we modelled and simulated Facebook and studied the behaviour in terms of cost, performance and energy consumption to reach a most appropriate solution. ····· 1036191530
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Multimedia application such as Voice over IP (VoIP) and Video Conferencing are the two demanding applications in the recent times. These applications are noise and delay sensitive due to their variable bit rate characteristic and require higher bandwidth. Therefore quality of service (QoS) has become essential consideration for supporting such applications. The Worldwide Interoperability for Microwave Access (WiMAX) is a popular wireless broadband technology having strong provision for QoS support of multimedia applications. This publication investigates the performance of VoIP and Video Conferencing over WiMAX network. Parameters that indicate Quality of Service such as delay, jitter, packet loss and throughput are analysed construction different scenarios on the basis of different service flows and codecs defined in WiMAX system. OPNET Modeller 14.5 has been used to design and simulate VoIP and Video Conferencing scenarios for the WiMAX Network to analyze its performance capabilities over these real time multimedia applications. The result suggests that better QoS is achieved by using appropriate service flows designed for specific applications. ····· 1036191497
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The Intrusion Detection Systems (IDS) play an important role in protecting the organizations from unauthorized activities. In this dissertation work, a framework using honeypot is proposed with Real Time Rule Accession (ReTRA) capability. Honeypot is used to prevent the attack and collect attack traffic on the network. Furthermore, Apriori algorithm for association rule mining is used on the data logged by honeypot to generate rules which is added to the Snort IDS dynamically. This is different from the previous method of off-line rule base addition. The proposed IDS is efficient in detecting the attacks at the time of their occurrences even if the system was not equipped with rules to detect it. The logs generated by honeypots can grow very large in size when there is heavy attack traffic in the system, thus consuming a lot of disk space. The huge log size poses difficulty when they are processed and analyzed as they consume a lot of time and resources. The proposed system addresses these issues. The logging module for efficient capture of attack traffic saves disk space. The log analyzer processes this log to generate reports and graphs for the security administrators. ····· 1036191462
für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Today s globalized world is driven by information. Due to its wide spread applicability and enormous potential to access information any-time, any-where wireless broadcast has emerged as power tool for data (information) delivery to masses. To effectively manage power and time issues pertaining mobile client and device industries and researchers in this field use various indexing techniques. In last few years we have investigated performance of these indexing techniques through simulation and modeling in different real time broadcast environments. Based on results obtained from these investigations alternative and effective techniques for multichannel data dissemination are designed and investigated further. This research book presents our complete study and investigation results obtained there off. ····· 1036191364
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray In today s networking there are several attractive alternatives to both public telephony and leased lines. IEEE 802.11 WLAN and Voice over IP are the most deployed technologies suitable for real-time applications which are playing major role in the next generation communication networks. In recent years VoIP has caught the imagination of communications and computing industries. Key characteristics of 802.11 WLAN technologies are simplicity, flexibility, and cost-effectiveness. The freedom to roam while still maintaining connectivity has helped propel wireless networking to new heights. However, VoIP solutions don t provide efficient usage of network bandwidth and can cause congestion of networks very quickly. In this project performance of two bandwidth reduction techniques cRTP and Silence Suppression for voice traffic over IEEE 802.11 WLANs is evaluated using OPNET Simulator. All the simulation results show that if cRTP and SS are employed together, they can significantly improve the network efficiency. ····· 1036191318
····· lezzter Preis 71.10€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Vehicle Ad hoc Networks (VANET) emerged as a subset of the Mobile Ad hoc Network (MANET) application it is considered to be a substantial approach to the Intelligent Transportation System (ITS). VANETs were introduced to support drivers and improve safety issues and driving comfort, as a step towards constructing a safer, cleaner and more intelligent environment. VANET has some unique characteristics compared to MANET specifically it includes high mobility and constrained patterns restricted by roads. Many challenges have emerged in VANET, encouraging researchers to investigate their research in an attempt to meet these challenges. Routing protocol issues are considered to be a critical dilemma that needs to be tackled in VANET, particularly in a sparse environment. This book introduces an efficient routing mechanism that impacts on enhancing network performance in terms of disseminating messages to a desired destination, balancing the overhead on the network and increasing the ratio of packet delivery with a reduced time delay. Moreover this book presents an On Board Unit (OBU) architecture for sending HELLO beacon messages adaptively in VANET based on the context aware system. ····· 1036191287
für 80.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Este libro presenta una introducción básica, para un enfoque neuronal del análisis de estructuras para edificios de varios pisos, con la aplicación práctica de las Redes Neuronales Artificiales (RNA) a problemas de la ingeniería estructural. Se presenta el contenido de una manera clara y consistente, para que el lector pueda aplicar con facilidad. Se incluye una reseña acerca de la evolución histórica de las estructuras. Asimismo, se presenta un problema de aplicación a un pórtico con nodos desplazables horizontalmente. Nuevos conceptos fundamentales de la tecnología de las RNA en el lenguaje del ingeniero, proporcionan al estudiante y profesional las herramientas necesarias para un óptimo desempeño de sus funciones. En el texto, brevemente se describe el fenómeno de la mitosis celular, que ha inspirado al autor para la distribución de momentos en los nodos y el diseño de la arquitectura de las RNA. ····· 1036190751
für 26.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Utilizar las redes de datos convencionales para ofrecer servicios mas complejos, tales como telefonía, seguridad física, control ambiental, manufactura, control de infraestructura crítica y muchos otros da origen a vulnerabilidades que no son estudiadas por los especialistas en seguridad de la información. Este texto de divulgación presenta algunas de estas tecnologías y vulnerabilidades con la intención de alertar a quienes administran redes de datos sobre las consecuencias de permitir la convergencia de aplicaciones adicionales. ····· 1036190305
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray En la actualidad las fibras ópticas de Polímero (Polymer Optical Fiber, POF) están empezando a ser utilizadas en varios campos, como por ejemplo: la industria automotriz, las redes de datos, la medicina, la industria aeroespacial, etc. A pesar de que en las POF se cuenta con anchos de banda de alrededor de las centenas de MHz (en distancias menores a 30 m.), en todos los campos antes mencionados se tiene la necesidad característica del aumento del ancho de banda debido principalmente a la necesidad de contar con altas velocidades de transmisión y, considerando que a futuro existirán servicios que requerirán una mayor disponibilidad de ancho de banda, una solución adecuada sería la implementación de WDM (Wavelenght Division Multiplexing). ····· 1036190062
für 35.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Se presenta un estudio sobre la aplicación de lógica difusa para el diseño de controladores predictivos para disminuir el tiempo de handoff en redes inalámbricas. Como resultado se obtienen dos modelos que permitirán mejorar la calidad de servicio. El primero, minimiza el tiempo de handoff, evaluando todos los valores de intensidad de señal promedio recibidos por la estación móvil, así como la variación de intensidad de señal para elegir el punto de acceso más conveniente, permite una incorporación al estándar actual IEEE 802.11 muy transparente. El segundo modelo, también predictivo difuso con un punto de inserción al estándar IEEE 802.11 distinto. Esta segunda propuesta proporciona mejores resultados ya que omite el cuello de botella de búsqueda activa (active scanning), y su inserción dentro del estándar actual es factible. ····· 1036189954
für 35.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray En el Instituto Tecnológico de Sonora (ITSON) se ha desarrollado un modelo de gestión del conocimiento que permita capturar, clasificar, utilizar y re-crear información y conocimiento que se transforme en productos y/o servicios que generen valor, además de resolver el problema de pérdida de conocimiento. Para ello, se diseñó una herramienta tecnológica con el fin de contar con un medio que impulse, promueva y dé a conocer el capital intelectual institucional de tal manera que agregue valor a las actividades sustantivas de la universidad. Sin embargo, la existencia de la plataforma tecnológica en sí misma no garantiza la funcionalidad del sistema además, el contar con el apoyo del autoridades, el tener una estructura organizacional acorde a los requerimientos, así como un plan de capacitación y comunicación no es suficiente para determinar el impacto o los beneficios que dicho modelo está aportando a la institución. Por ello, es necesario valorar la contribución de cada uno de los elementos implicados (tecnología, procesos, gente, cultura, contenidos, entre otros) en el desarrollo del capital intelectual de la institución. ····· 1036189908
für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Las tecnologías en el ámbito de las comunicaciones y de la información avanzan, ya no es necesario un cable para podernos conectar a Internet desde cualquier lugar. Con la llegada de las redes WLANs todo es más fácil, cómodo y flexible, siendo muchos los que se acogen a esta nueva tecnología. Aunque en las redes WI-FI, que es como comúnmente se le conocen, puedan parecer que todo son beneficios, hay que tener en cuenta ciertas características que las hacen más débiles frente a las redes cableadas. Puesto que el medio de transmisión de las redes WI-FI es el aire, se convierten en redes más accesibles, siendo un atractivo para los hackers, no sólo para beneficiarse del ancho de banda, sino también por los datos e información privada de particulares y empresas. En este libro pretendemos detallar las medidas básicas necesarias para configurar una red WI-FI segura, describir los ataques a los que estamos expuestos aportando posibles soluciones y las configuraciones más adecuadas. Para ello complementamos los conceptos teóricos con la realización de varios casos prácticos descritos paso a paso , considerando éste el gran valor añadido de nuestro trabajo. ····· 1036189800
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray La telefonía IP ha revolucionado el mundo de las telecomunicaciones. Esta nueva tecnología, que inicialmente solo tenía presencia en las grandes compañías, empieza a irrumpir con fuerza en la mediana y pequeña empresa. El entorno en el que se encuentra inmersa es muy amplio, necesitando de la compresión de un gran número de técnicas para poder desarrollarse. Todo esto hace que en muchas ocasiones el iniciarse en la VoIP sea una tarea más que ardua. Este libro, mediante la síntesis de las principales tecnologías VoIP y la inclusión de numerosos ejemplos, proporciona una guía para iniciarse en la telefonía IP. Un caso práctico explica con detalle la implantación de un sistema VoIP en una empresa, brindando la posibilidad de descubrir en un contexto real las bondades que ofrece la telefonía de código abierto así como los problemas a los que enfrentarse. A su finalización seremos capaces de instalar, configurar y aprender la sintaxis de Asterisk (solución con más de 400 desarrolladores activos en el último año y 56.000 participando en foros) abordando funcionalidades tan demandadas como la mensajería unificada, el rutado inteligente para disminuir costes, videoconferencia . ····· 1036189542
für 26.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Un gran número de procesos y trámites requieren firmas y/o la plena identificación de quienes intervienen en los mismos. Con el fin de automatizar dichos procesos, es necesario definir una infraestructura logística y tecnológica que iguale o mejore las garantías de seguridad informática y jurídica requeridas. El presente escrito plantea una solución específica y práctica para lograr de manera masiva dicha automatización de procesos en el caso colombiano, teniendo en cuenta el contexto tecnológico, logístico y jurídico del país. Para esto, se tienen en cuenta casos de éxito en otros países, así como los avances que ha tenido Colombia en los diferentes aspectos requeridos para hacer viable la solución planteada. Adicionalmente, se identifican las restricciones que supone una solución de esta naturaleza, con el fin de lograr un real dimensionamiento de la misma. ····· 1036189482· 1 · ::::: · 8 ·· 9 ·· 10 ·· 11 ·· 12 ·· 13 ·· 14 · ::::: · 17 ·
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