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  • Communications and Radar  (4)
  • Computer Programming and Software  (3)
  • Computer Systems  (2)
  • Chemistry
  • Fluid Mechanics and Heat Transfer
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  • 1995-1999  (9)
  • 1970-1974
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  • 1999  (9)
  • 1
    Publikationsdatum: 2018-06-08
    Beschreibung: The Optical Communications Demonstrator (OCD) is a laboratory based lasercom terminal that was developed to validate several key technologies such as precision beam pointing, high bandwidth beacon tracking and beacon acquisition.
    Schlagwort(e): Communications and Radar
    Materialart: International Society for Optical Engineering (SPIE) - Laser Communications Technologies; United States
    Format: text
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  • 2
    Publikationsdatum: 2018-06-08
    Beschreibung: This paper presents an overview of the preliminary design of both the flight and ground systems of the Optical Communication Demonstration and High-Rate Link Facility which will demonstrate optical communication from the International Space Station to ground after its deployment in October 2002.
    Schlagwort(e): Communications and Radar
    Materialart: International Society for Optical Engineering (SPIE), Free-Space Optical Communication; San Jose, CA; United States
    Format: text
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  • 3
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    In:  Other Sources
    Publikationsdatum: 2018-06-08
    Schlagwort(e): Communications and Radar
    Materialart: Diode Laser Technology Review; FL; United States
    Format: text
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  • 4
    Publikationsdatum: 2018-06-08
    Beschreibung: Introduction to free space optical communications.
    Schlagwort(e): Communications and Radar
    Materialart: DESCANSO Symposium; Pasadena, CA; United States
    Format: text
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  • 5
    Publikationsdatum: 2019-07-13
    Beschreibung: Classical mesh partitioning algorithms were designed for rather static situations, and their straightforward application in a dynamical framework may lead to unsatisfactory results, e.g., excessive data migration among processors. Furthermore, special attention should be paid to their amenability to parallelization. In this paper, a novel parallel method for the dynamic partitioning of adaptive unstructured meshes is described. It is based on a linear representation of the mesh using self-avoiding walks.
    Schlagwort(e): Computer Systems
    Materialart: IPPS''99; Apr 12, 1999 - Apr 16, 1999; San Juan; Puerto Rico
    Format: application/pdf
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  • 6
    Publikationsdatum: 2019-07-13
    Beschreibung: This viewgraph presentation covers the advantages of mesh adaptation, unstructured grids, and dynamic load balancing. It illustrates parallel adaptive communications, and explains PLUM (Parallel dynamic load balancing for adaptive unstructured meshes), and PSAW (Proper Self Avoiding Walks).
    Schlagwort(e): Computer Programming and Software
    Materialart: Petaflops II; Feb 15, 1999 - Feb 19, 1999; Santa Barbara, CA; United States
    Format: application/pdf
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  • 7
    Publikationsdatum: 2019-07-13
    Beschreibung: The success of parallel computing in solving real-life computationally-intensive problems relies on their efficient mapping and execution on large-scale multiprocessor architectures. Many important applications are both unstructured and dynamic in nature, making their efficient parallel implementation a daunting task. This paper presents the parallelization of a dynamic unstructured mesh adaptation algorithm using three popular programming paradigms on three leading supercomputers. We examine an MPI message-passing implementation on the Cray T3E and the SGI Origin2OOO, a shared-memory implementation using cache coherent nonuniform memory access (CC-NUMA) of the Origin2OOO, and a multi-threaded version on the newly-released Tera Multi-threaded Architecture (MTA). We compare several critical factors of this parallel code development, including runtime, scalability, programmability, and memory overhead. Our overall results demonstrate that multi-threaded systems offer tremendous potential for quickly and efficiently solving some of the most challenging real-life problems on parallel computers.
    Schlagwort(e): Computer Systems
    Materialart: Supercomputing; Nov 13, 1999 - Nov 19, 1999; Portland, OR; United States
    Format: application/pdf
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  • 8
    Publikationsdatum: 2019-07-13
    Beschreibung: The ability to dynamically adapt an unstructured -rid (or mesh) is a powerful tool for solving computational problems with evolving physical features; however, an efficient parallel implementation is rather difficult, particularly from the view point of portability on various multiprocessor platforms We address this problem by developing PLUM, tin automatic anti architecture-independent framework for adaptive numerical computations in a message-passing environment. Portability is demonstrated by comparing performance on an SP2, an Origin2000, and a T3E, without any code modifications. We also present a general-purpose load balancer that utilizes symmetric broadcast networks (SBN) as the underlying communication pattern, with a goal to providing a global view of system loads across processors. Experiments on, an SP2 and an Origin2000 demonstrate the portability of our approach which achieves superb load balance at the cost of minimal extra overhead.
    Schlagwort(e): Computer Programming and Software
    Materialart: International Parallel Processing; Apr 12, 1999 - Apr 16, 1999; San Juan; Puerto Rico
    Format: application/pdf
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  • 9
    Publikationsdatum: 2019-07-10
    Beschreibung: The ability to dynamically adapt an unstructured grid is a powerful tool for efficiently solving computational problems with evolving physical features. In this paper, we report on our experience parallelizing an edge-based adaptation scheme, called 3D_TAG. using message passing. Results show excellent speedup when a realistic helicopter rotor mesh is randomly refined. However. performance deteriorates when the mesh is refined using a solution-based error indicator since mesh adaptation for practical problems occurs in a localized region., creating a severe load imbalance. To address this problem, we have developed PLUM, a global dynamic load balancing framework for adaptive numerical computations. Even though PLUM primarily balances processor workloads for the solution phase, it reduces the load imbalance problem within mesh adaptation by repartitioning the mesh after targeting edges for refinement but before the actual subdivision. This dramatically improves the performance of parallel 3D_TAG since refinement occurs in a more load balanced fashion. We also present optimal and heuristic algorithms that, when applied to the default mapping of a parallel repartitioner, significantly reduce the data redistribution overhead. Finally, portability is examined by comparing performance on three state-of-the-art parallel machines.
    Schlagwort(e): Computer Programming and Software
    Format: application/pdf
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