This research is concerned with the technoeconomic aspects of modern and next-generation telecommunications including the Internet service. The goal of this study thereof is tailored to address the following: (i) Reviewing the technoeconomic considerations prevailing in telecommunication (telco) systems and their implicating futures; (ii) studying relevant considerations by depicting the modern/next-generation telecommunications as a digital ecosystem viewed in terms of underlying complex system evolution (akin to biological systems); (iii) pursuant to the digital ecosystem concept, co-evolution modeling of competitive business structures in the technoeconomics of telco services using dichotomous (flip-flop) states as seen in prey-predator evolution; (iv) specific to Internet pricing economics, deducing the profile of consumer surplus versus pricing model under DiffServ QoS architecture pertinent to dynamic- , smart- and static-markets; (v) developing and exemplifying decision-making pursuits in telco business under non-competitive and competitive markets (via gametheoretic approach); (vi) and modeling forecasting issues in telco services addressed in terms of a simplified ARIMA-based time-series approach, (which includes seasonal and non-seasonal data plus goodness-fit estimations in time- and frequency-domains). Commensurate with the topics indicated above, necessary analytical derivations/models are proposed and computational exercises are performed (with MatLabTM R2006b and other software as needed). Extensive data gathered from open literature are used thereof and, ad hoc model verifications are performed. Lastly, results are discussed, inferences are made and open-questions for further research are identified. / by Renata Cristina Tourinho Sardenberg. / Thesis (Ph.D.)--Florida Atlantic University, 2010. / Includes bibliography. / Electronic reproduction. Boca Raton, Fla., 2010. Mode of access: World Wide Web.

Ad-Hoc mesh networks offer great promise. Low-cost ad-hoc mesh networks can be built using popular IEEE 802.11 equipment, but such networks are unable to guarantee each node a fair share of bandwidth. Furthermore, hidden node problems cause collisions which can cripple the throughput of a network. This research proposes a novel mechanism which is able to overcome hidden node problems and provide fair bandwidth sharing among nodes on ad-hoc 802.11 networks, and can be implemented on existing network devices. The scheme uses TDM (time division multiplexing) with slot reservation. A distributed beacon packet latency measurement mechanism is used to achieve node synchronisation. The distributed nature of the mechanism makes it applicable to ad-hoc 802.11 networks, which can either grow or fragment dynamically.

Orientadores: Leonardo de Souza Mendes, Mario Lemes Proença Junior / Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação / Made available in DSpace on 2018-08-16T19:18:19Z (GMT). No. of bitstreams: 1 Zarpelao_BrunoBogaz_D.pdf: 5089650 bytes, checksum: 281e7d926aae4a7e05a2e94347a06179 (MD5) Previous issue date: 2010 / Resumo: Anomalias em redes de computadores são desvios súbitos e acentuados que ocorrem no tráfego em consequência de diversas situações como defeitos em softwares, uso abusivo de recursos da rede, falhas em equipamentos, erros em configurações e ataques. Nesta tese, é proposto um sistema de detecção de anomalias em redes de computadores baseado em três níveis de análise. O primeiro nível de análise é responsável por comparar os dados coletados em um objeto SNMP (Simple Network Management Protocol) com o perfil de operações normais da rede. O segundo nível de análise correlaciona os alarmes gerados no primeiro nível de análise utilizando um grafo de dependências que representa as relações entre os objetos SNMP monitorados. O terceiro nível de análise reúne os alarmes de segundo nível utilizando informações sobre a topologia de rede e gera um alarme de terceiro nível que reporta a propagação da anomalia pela rede. Os testes foram realizados na rede da Universidade Estadual de Londrina, utilizando situações reais. Os resultados mostraram que a proposta apresentou baixas taxas de falsos positivos combinadas a altas taxas de detecção. Além disso, o sistema foi capaz de correlacionar alarmes gerados para diferentes objetos SNMP em toda a rede, produzindo conjuntos menores de alarmes que ofereceram ao administrador de redes uma visão panorâmica do problema / Abstract: Anomalies in computer networks are unexpected and significant deviations that occur in network traffic due to different situations such as software bugs, unfair resource usage, failures, misconfiguration and attacks. In this work, it is proposed an anomaly detection system based on three levels of analysis. The first level of analysis is responsible for comparing the data collected from SNMP (Simple Network Management Protocol) objects with the profile of network normal behavior. The second level of analysis correlates the alarms generated by the first level of analysis by using a dependency graph, which represents the relationships between the SNMP objects. The third level of analysis correlates the second level alarms by using network topology information. The third level generates a third level alarm that presents the anomaly propagation path through the network. Tests were performed in the State University of Londrina network, exploring real situations. Results showed that the proposal presents low false positive rates and high detection rates. Moreover, the proposed system is able to correlate alarms that were generated for SNMP objects at different places of the network, producing smaller sets of alarms that offer a wide-view of the problem to the network administrator / Doutorado / Telecomunicações e Telemática / Doutor em Engenharia Elétrica

Orientador: Edmundo Roberto Mauro Madeira / Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Computação / Made available in DSpace on 2018-08-13T22:59:15Z (GMT). No. of bitstreams: 1 Carvalho_ClaudioSiqueirade_M.pdf: 1911340 bytes, checksum: 98bf30359311a3a79379b1ed1c97441d (MD5) Previous issue date: 2006 / Mestrado / Mestre em Ciência da Computação

The transmission of realtime audio data across digital networks is subject to strict quality of service requirements. These networks need to be able to guarantee network resources (e.g., bandwidth), ensure timely and deterministic data delivery, and provide time synchronisation mechanisms to ensure successful transmission of this data. Two open standards-based networking technologies, namely IEEE 1394 and the recently standardised Ethernet AVB, provide distinct methods for achieving these goals. Audio devices that are compatible with IEEE 1394 networks exist, and audio devices that are compatible with Ethernet AVB networks are starting to come onto the market. There is a need for mechanisms to provide compatibility between the audio devices that reside on these disparate networks such that existing IEEE 1394 audio devices are able to communicate with Ethernet AVB audio devices, and vice versa. The audio devices that reside on these networks may be remotely controlled by a diverse set of incompatible command and control protocols. It is desirable to have a common network-neutral method of control over the various parameters of the devices that reside on these networks. As part of this study, two Ethernet AVB systems were developed. One system acts as an Ethernet AVB audio endpoint device and another system acts as an audio gateway between IEEE 1394 and Ethernet AVB networks. These systems, along with existing IEEE 1394 audio devices, were used to demonstrate the ability to transfer audio data between the networking technologies. Each of the devices is remotely controllable via a network neutral command and control protocol, XFN. The IEEE 1394 and Ethernet AVB devices are used to demonstrate the use of the XFN protocol to allow for network neutral connection management to take place between IEEE 1394 and Ethernet AVB networks. User control over these diverse devices is achieved via the use of a graphical patchbay application, which aims to provide a consistent user interface to a diverse range of devices.

Discusses the development of WebSAT (Web-based systems administration tool), a computer network tool that allows systems administrators to create and delete accounts, disable and enable existing accounts, manage disk space conveniently, monitor the status of all network printers, and monitor network security. The WebSAT application was implemented using PHP, a server-side embedded scripting language, with a MySQL database.

Thesis (MAcc (Accountancy))--University of Stellenbosch, 2007. / The successful implementation of an Enterprise Resource Planning (ERP) System can help an organisation to redefine its business processes and enhance its competitive advantage. An ERP System Implementation is a transformation project, which changes the way an organisation thinks and acts about its business. An ERP System implementation is also a complex endeavour, and as such, it requires rigorous risk management. The understanding and management of risks relevant to ERP System Implementation Projects are critical in order to ensure that the project delivers on its objectives within the specified budget and timelines, and eventually realises the envisaged business benefits. The purpose of this study is to discuss how key risks relevant to ERP System Implementation Projects could be addressed by applying project management disciplines derived from the PRINCE2 (PRojects IN Controlled Environment) project management methodology. This methodology was developed by the Office of Government Commerce in the United Kingdom. This study also provides a framework that could be applied at the outset and during an ERP System Implementation Project by business management, to understand the risks (“what could go wrong?”) and project management disciplines that should be applied to address these risks (“what must go right?”). This framework was derived by: • Identifying key risks relevant to ERP System Implementation Projects; • Mapping these key risks onto SAP Implementation phases to highlight where these risks could materialise in the SAP Implementation process; • Then mapping these key risks across PRINCE2 project management processes and SAP Implementation phases by creating the SAP Implementation Key Risks Map; and finally • Providing a detailed description of how to apply PRINCE2 project management disciplines to address each risk in the SAP Implementation Key Risks Map.

Funcionalidades de eficiência energética vêm sendo integradas a protocolos e sistemas de gerenciamento de redes. Várias dessas funcionalidades afetam a rede de diferentes modos, acarretando compromissos. Podem afetar a confiabilidade e a disponibilidade da rede ao colocarem equipamentos e enlaces em modo dormente; e podem afetar o tempo de vida dos equipamentos ao alterarem seu modo de utilização. Os resultados da integração dessas funcionalidades à rede podem ser avaliados por emulação, que provê informação sobre como algum mecanismo de roteamento em particular, fruto dessa integração, agiria em diferentes condições de rede. Preparar um ambiente de experimentação que trate das interações entre diferentes funções da rede, considerando as funcionalidades de eficiência energética, traz alguns desafios. Uma combinação de emulação e implementação das principais funcionalidades de eficiência energética provê uma visão mais próxima sobre o que pode ocorrer em implantações reais de sistemas de gerenciamento energeticamente eficiente. Esta dissertação discute (i) como se avaliarem os compromissos existentes no emprego de técnicas de eficiência energética, mostrando também como o tempo de vida de equipamentos pode ser alterado e como a confiabilidade e disponibilidade da rede podem ser degradadas, e discute (ii) requisitos para o desenvolvimento de um ambiente de experimentação para avaliação de tais técnicas. O ambiente é baseado em roteadores implementados por software, para emulação de funcionalidades ainda não disponíveis, mas desejadas, de equipamentos de rede. Após a experimentação do protótipo de um sistema de gerenciamento de redes orientado por política de eficiência energética, aplicam-se os métodos de avaliação dos compromissos ocasionados por este sistema. / Energy efficiency features are being integrated in network protocols and management systems. Many of such features affect the network in different ways, thus yielding tradeoffs. They can affect the reliability and availability of the network when they put devices or links into sleep mode, and they can affect the lifetime of the devices as a result of the new operating pattern. The effects of integrating these features to the network can be assessed through emulation, which can provide insight on how a particular routing mechanism would perform in different network conditions. In addition, building an experimentation environment that is able to comprehensively account for interactions between different network functions taking into account energy efficiency features is challenging. A combination of emulation and implementation of major energy efficiency features provides a view closer to what may happen in a real deployment of energy-efficient management systems. This dissertation discusses (i) how to evaluate the tradeoffs existing between the use of energy-efficiency techniques and the lifetime of devices and with the reliability and availability of the network, and (ii) requirements for the development of a testbed to evaluate such techniques. The testbed is based on software routers, so to emulate future and desired network equipment functionalities. After experiments with the prototype of a sustainability-oriented network management system based on policies, an evaluation about the tradeoffs brought by such system to the network is performed.

In this research, I report and analyze the experiences of people working with small-scale enterprises in the Colombian textile artisanal sector for understanding how artisanal products are delivered to national and international markets. The data was collected by interviewing design managers and managers currently working with several of these small-scale enterprises. This paper was done considering four important features: firstly, the enormous potential that the Colombian textile industry once held back in the 1960’s; secondly, Colombia’s rich and multiple artisanal creations as expression of culture and idiosyncrasy that show the country’s ample geography and culture; thirdly, the characteristics of the Colombian economy and industry which is mainly composed of micro and small enterprises; and lastly , the lack of research on small-scale value networks. In this research the idea of linear value chains is superseded by the notion of value networks, in which relationships, activities and actors are interconnected to co-create value. In this setting, culture, people and sustainability are the key factors to reach differentiation. By learning from these experiences and analyzing practices in small-scale enterprises I can suggest that, new approaches that benefit and reinforce the characteristics of the small and medium scale enterprises must be built as an opportunity for improving the lives of people in developing countries. Additionally, relationships and the order of the production and marketing flows within the value networks depend on the manager approach. / Program: Textilt management med inriktning styrning av textila värdekedjor

Native Multicast plays an important role in distributing and managing delivery of some of the most popular Internet applications, such as IPTV and media delivery. However, due to patchy support and the existence of multiple approaches for Native Multicast, the support for Native Multicast is fragmented into isolated areas termed Multicast Islands. This renders Native Multicast unfit to be used as an Internet wide application. Instead, Application Layer Multicast, which does not have such network requirements but is more expensive in terms of bandwidth and overhead, can be used to connect the native multicast islands. This thesis proposes Opportunistic Native Multicast (ONM) which employs Application LayerMulticast (ALM), on top of a DHT-based P2P overlay network, and Automatic Multicast Tunnelling (AMT) to connect these islands. ALM will be used for discovery and initiating the AMT tunnels. The tunnels will encapsulate the traffic going between islands' Primary Nodes (PNs). AMT was used for its added benefits such as security and being better at traffic shaping and Quality Of Service (QoS). While different approaches for connecting multicast islands exists, the system proposed in the thesis was designed with the following characteristics in mind: scalability, availability, interoperability, self-adaptation and efficiency. Importantly, by utilising AMT tunnels, this approach has unique properties that improve network security and management.