1. Component-Based Architectures for System Synthesis

    01:10:30

    from ISR at UMD / Added

    107 Plays / / 0 Comments

    John Baras Institute for Systems Research and Department of Electrical and Computer Engineering Abstract Advances in Information Technology have enabled the design of complex networked systems, with large number of heterogeneous components and capable of multiple complex functions. These advances have at the same time increased the capabilities of such systems and have increased their complexity to such an extent that systematic design towards predictable performance is extremely difficult if not unfeasible today. This is especially manifested in the area of cyber-physical systems, of all scales, that have become ubiquitous. We first describe the current state of model-based systems engineering (MBSE), a system level design methodology that addresses these challenges. We then show how MBSE leads to a new methodology for designing wireless communication network protocols, which we call Component Based Networking (CBN). The new formal and model-based approach allows a systematic study of network performance and cross-layer analysis and design of routing, scheduling, MAC and PHY layer protocols. We use the method to design new and improved neighbor discovery and topology dissemination components for mobile wireless networks. We formulate the selective link-state broadcast as a graph pruning problem with restricted local neighborhood information and we develop general conditions for the distributed local policies to preserve the stable routing paths globally. We demonstrate that the resulting algorithm, when used with the popular ETX metric, outperforms topology control mechanisms commonly used for Mobile Ad Hoc Networks such as in the OLSR protocol. The analytical tools we use include idempotent semirings, the algebraic path problem, multi-criteria tradeoff analysis. We demonstrate further, using an example from trusted routing, that logical security rules of admission control can be combined with delay performance metrics using this multi-criteria optimization framework. We close by describing briefly fundamental research challenges and promising applications of MBSE in several areas: collaborative robotics, collaborative heterogeneous sensor networks, cybersecurity of critical infrastructures, human-machine teams and organizations, and composite trust.

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    • Jake~Cham Wedding

      03:00

      from Jofre Nachor / Added

      168 Plays / / 0 Comments

      On Site Edit (Same Day) January 22, 2011 Punta De Fabian Resort, Baras Rizal BLISS | ATELIER PILIPINAS Direction/Editing: JOFRE NACHOR Photography: JOHN TRONCO Cinematography: JOSEPH FIGUEROA KANO JOFRE NACHOR

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      • Model-Based SE using SysML

        01:16:46

        from ISR at UMD / Added

        451 Plays / / 2 Comments

        Sanford Friedenthal Lockheed Martin Host John Baras Abstract The practice of systems engineering is transitioning from a document-based approach to a model-based approach. In a model-based approach, emphasis is placed on defining, managing, and controlling a coherent model of the system that can then be reflected in systems engineering documentation such as specifications, interface control documentation, system design documentation, trade studies, and analysis reports. This presentation will provide an overview of the benefits of the model-based systems engineering (MBSE) approach over a document-based approach in terms of how it can improve productivity, quality, and enhance communications among the development team. The presentation also highlights how MBSE can be used to flow requirements down from the mission level to the system design and to hardware and software components, and how SysML integrates with other models. Some of the lessons learned from early applications of MBSE using the SysML standard will also be presented. Biography Sanford Friedenthal is a Lockheed Martin Fellow and currently leads an effort to enable Model Based Systems Development (MBSD) and other advanced practices across the company. His experience includes the application of systems engineering throughout the system life-cycle from conceptual design, through development and production on a broad range of systems in aerospace and defense. He has been a systems engineering department manager, and a lead developer of advanced systems engineering processes and methods including the Lockheed Martin Integrated Enterprise Process and the Object-Oriented Systems Engineering Method (OOSEM). Mr. Friedenthal was a leader of the Industry Standards effort through the Object Management Group (OMG) and INCOSE to develop the Systems Modeling Language (OMG SysML) that was adopted by the OMG in 2006. He is co-author of A Practical Guide to SysML.

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        • JOS MEILĖ. HER LOVE. 3 of 3

          06:57

          from Artūras Barysas, Baras / Added

          80 Plays / / 0 Comments

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          • JOS MEILĖ. HER LOVE. 2 of 3

            09:38

            from Artūras Barysas, Baras / Added

            117 Plays / / 0 Comments

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            • JOS MEILĖ. HER LOVE. 1 of 3

              08:03

              from Artūras Barysas, Baras / Added

              131 Plays / / 0 Comments

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              • SNIEGAS. A Snow

                02:57

                from Artūras Barysas, Baras / Added

                103 Plays / / 0 Comments

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