Recent advances in coherent detection and digital signal processing (DSP) technologies have stimulated the exploration of novel agile architectures for WDM core networks. Filterless optical networks are passive broadc...
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ISBN:
(纸本)9781457708800
Recent advances in coherent detection and digital signal processing (DSP) technologies have stimulated the exploration of novel agile architectures for WDM core networks. Filterless optical networks are passive broadcast & select networks in which the need for agility is delivered by DSP-assisted tunable transceivers, and simple passive splitters/combiners are used for interconnecting the fiber links. the resulting network architecture is expected to bring about significant advantages, such as reduced installed first cost (IFC) of the network, ease of maintenance, and reconfigurability, as well as good resilience and multicast capabilities. In this paper, the filterless network design problem is defined for a wide area network (WAN), and a method based on genetic and Tabu search algorithms is proposed for designing long haul (LH) filterless networks based on the concept of "filterless islands". Filterless network solutions are then proposed for a number of core network topologies, and the main characteristics of the solutions are presented. Our results show that filterless solutions can be found for different WAN topologies and confirm that the filterless networking concept is applicable to optical core networks.
作者:
Goller, JohannesMacmillan
Digital Science Chiyoda Bldg. 2-37 Ichigayatamachi Shinjuku-ku Tokyo Japan
the paper presents the results of an analysis of the merits and problems of using suffix arrays as an index data structure for annotated natural-language corpora. It shows how multiple suffix arrays can be combined to...
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the paper presents the results of an analysis of the merits and problems of using suffix arrays as an index data structure for annotated natural-language corpora. It shows how multiple suffix arrays can be combined to represent layers of annotation, and how this enables matches for complex linguistic patterns to be identified in the corpus quickly and, for a large subclass of patterns, with greater theoretical efficiency than alternative approaches. the results reported include construction times and retrieval times for an annotated corpus of 1.9 billion characters in length, and a range of example patterns of varying complexity.
On September 13th, 2010, the 1st international Workshop on Cross Enterprise Collaboration, People and Work (SG-PAW) was held as part of the 8thinternationalconference on Business Process Management (BPM 10) in Hobok...
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the growing need for power efficient extreme-scale high-performance computing (HPC) coupled with plateauing clock-speeds is driving the emergence of massively parallel compute architectures. Tens to many hundreds of c...
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ISBN:
(纸本)9781450307710
the growing need for power efficient extreme-scale high-performance computing (HPC) coupled with plateauing clock-speeds is driving the emergence of massively parallel compute architectures. Tens to many hundreds of cores are increasingly made available as compute units, either as the integral part of the main processor or as coprocessors designed for handling massively parallel workloads. In the case of many-core graphics processing units (GPUs) hundreds of SIMD cores primarily designed for image and video rendering are used for high-performance scientific computations. the new architectures typically offer ANSI standard programming models such as CUDA (NVIDIA) and OpenCL. However, the wide-ranging adoption of these parallelarchitectures is steeped in difficult learning curve and requires reengineering of existing applications that mostly leads to expensive and error prone code rewrites without prior guarantee and knowledge of any speedups. Broad range of complex scientific applications across many domains use common algorithms and techniques, such as adaptive mesh refinements (AMR), advanced hydrodynamics partial differential equation (PDE) solvers, Poisson-Gravity solvers etc, that have demonstrably performed highly efficiently on GPU based systems. Taking advantage of the commonalities, we use GPU-aware AMR code, GAMER [1], to examine the unique approach of solving multi-science problems in astrophysics, hydrodynamics and particle physics with single codebase. We demonstrate significant speedups in disparate class of scientific applications on 3 separate clusters, viz., Dirac, Laohu and Mole 8.5. By extensively reusing the extendable single codebase we mitigate the impediments of significant code rewrites. We also collect performance and energy consumption benchmark metrics on 50-nodes NVIDIA C2050 GPU and Intel 8-core Nehalem CPU on Dirac cluster at the National Energy Research Supercomputing Center (NERSC). In addition, we propose a strategy and framework for
作者:
Renken, FolkerJade Univ
Dept Engn Power Elect Friedrich Paffrath Str 101 D-26389 Wilhelmshaven Germany
Vehicles with hybrid drive systems are characterized by their driving dynamics, their energy efficiency and their environment-friendliness especially. Dependent on the electrical power and the drive train structure th...
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ISBN:
(纸本)9789984440712
Vehicles with hybrid drive systems are characterized by their driving dynamics, their energy efficiency and their environment-friendliness especially. Dependent on the electrical power and the drive train structure these hybrid drives are grouped into different classes. Designations such as micro-hybrid, mild hybrid, full-hybrid, serial-hybrid, serial/parallel-hybrid or power-split-hybrid reflect the large variance of these different drive train possibilities. In hybrid drive systems electronically controlled converters take an important role. With such a converter also the energy exchange between electrical power system and electrical machine is regulated. the reduction of the vehicle fuel consumption here is of special interest. Today's hybrid vehicles use for the control mainly information from the present driving conditions, taking into account the actual electrical power system-charge as well as the power demand of the driver. With such a control already considerable fuel reductions are reached But additionally superimposed control and information systems promise substantial potential for more fuel reduction. Withthese systems an outstanding energy-saving and anticipatory way of driving could be realized. the aim is to find the best operating point in each case for the combustion engine and to adapt the charge state of the electrical power system to the respective driving situation.
this paper presents parallel versions of Gusfield's cut tree algorithm. Cut trees are a compact representation of the edge-connectivity between every pair of vertices of an undirected graph. Cut trees have many ap...
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the proceedings contain 153 papers. the topics discussed include: reducing communication overhead under parallel list processing in multicore clusters;reinforced-SLAM for path planning and mapping in dynamic environme...
ISBN:
(纸本)9781457710117
the proceedings contain 153 papers. the topics discussed include: reducing communication overhead under parallel list processing in multicore clusters;reinforced-SLAM for path planning and mapping in dynamic environments;discrete-time sliding mode controllers for nonholonomic mobile robots trajectory tracking problem;analysis of power system stability using phase plane analysis of linear OMIB equivalents;adaptive PI controller for a flow process, using an industrial platform with an OPC communication protocol;path following through reference points for a car-like mobile robot;predator-prey analytical dynamics behavior using normal form method;ASYNCAR, a radio-controlled vehicle for asynchronous experiments implementation of an event-based cruise control;single-phase illuminated transmission line model including corona effect;and a model-free backstepping with integral sliding mode control for underactuated ROVs.
the computational demands of multimedia data processing are steadily increasing as consumers call for progressively more complex and intelligent multimedia services. New multi-core hardware architectures provide the r...
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ISBN:
(纸本)9780769545110
the computational demands of multimedia data processing are steadily increasing as consumers call for progressively more complex and intelligent multimedia services. New multi-core hardware architectures provide the required resources, but writing parallel, distributed applications remains a labor-intensive task compared to their sequential counter-part. For this reason, Google and Microsoft implemented their respective processing frameworks MapReduce [10] and Dryad [19], as they allow the developer to think sequentially, yet benefit from parallel and distributed execution. An inherent limitation in the design of these batch processing frameworks is their inability to express arbitrarily complex workloads. the dependency graphs of the frameworks are often limited to directed acyclic graphs, or even pre-determined stages. this is particularly problematic for video encoding and other algorithmsthat depend on iterative execution. Withthe Nornir runtime system for parallel programs [39], which is a Kahn Process Network implementation, we addressed and solved several of these limitations. However, it is more difficult to use than other frameworks due to its complex programming model. In this paper, we build on the knowledge gained from Nornir and present a new framework, called P2G, designed specifically for developing and processing distributed real-time multimedia data. P2G supports arbitrarily complex dependency graphs with cycles, branches and deadlines, and provides both data- and task-parallelism. the framework is implemented to scale transparently with available (heterogeneous) resources, a concept familiar from the cloud computing paradigm. We have implemented an (interchangeable) P2G kernel language to ease development. In this paper, we present a proof of concept implementation of a P2G execution node and some experimental examples using complex workloads like Motion JPEG and Kmeans clustering. the results show that the P2G system is a feasible approach to mu
Aggregation is a sub-task of Natural Language Generation (NLG) that improves the conciseness and readability of the text outputted by NLG systems. Till date, approaches towards the aggregation task have been predomina...
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Aggregation is a sub-task of Natural Language Generation (NLG) that improves the conciseness and readability of the text outputted by NLG systems. Till date, approaches towards the aggregation task have been predominantly manual (manual analysis of domain specific corpus and development of rules). In this paper, a new algorithm for aggregation in NLG is proposed, that learns context sensitive aggregation rules from a parallel corpus of multi-sentential texts and their underlying semantic representations. Additionally, the algorithm accepts external constraints and interacts withthe surface realizer to generate the best output. Experiments show that the proposed context sensitive probablistic aggregation algorithm performs better than the deterministic hand crafted aggregation rules.
Ultra high density oligonucleotide micro arrays allow several millions of genetic markers in a single experiment to be observed. Current bioinformatics software for gene expression quantile data normalization is unabl...
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