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检索条件"机构=Department of Computer Science Communication and Distributed Systems"

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Polyphonic instrument recognition using spectral clustering

Polyphonic instrument recognition using spectral clustering

引用

8th International Conference on Music Information Retrieval, ISMIR 2007

作者： Martins, Luis Gustavo Burred, Juan Jośe Tzanetakis, George Lagrange, Mathieu Telecommunications and Multimedia Unit INESC Porto Porto Portugal Communication Systems Group Technical University of Berlin Berlin Germany Computer Science Department University of Victoria Victoria BC Canada

ISBN: (纸本)9783854032182

The identification of the instruments playing in a polyphonic music signal is an important and unsolved problem in Music Information Retrieval. In this paper, we propose a framework for the sound source separation and timbre classification of polyphonic, multi-instrumental music signals. The sound source separation method is inspired by ideas from Computational Auditory Scene Analysis and formulated as a graph partitioning problem. It utilizes a sinusoidal analysis front-end and makes use of the normalized cut, applied as a global criterion for segmenting graphs. Timbre models for six musical instruments are used for the classification of the resulting sound sources. The proposed framework is evaluated on a dataset consisting of mixtures of a variable number of simultaneous pitches and instruments, up to a maximum of four concurrent notes. ©2007 Austrian computer Society (OCG).

关键词： Clustering algorithms

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STIS: Smart Travel Planning Across Multiple Modes of Transportation

STIS: Smart Travel Planning Across Multiple Modes of Transpo...

引用

International Conference on Intelligent Transportation

作者： Shane Brennan Rene Meier Lero @ TCD Distributed Systems Group Department of Computer Science Trinity College Dublin Dublin Ireland

Travellers require information on individual transport systems when planning a journey. Many transport-rich urban environments contain numerous underlying transport infrastructures, offering a traveller various ways to complete the journey. This paper presents the smart traveller information service, a system designed to offer travellers an easy to use and efficient means of planning journeys in an otherwise complex multi-modal transport environment. The smart traveller information service bridges the coordination gap between the available transport systems (both public and private), and hides the complexity of the travel planning process from the user. This allows travellers to construct detailed journey plans without concerning themselves with the often heterogeneous and disjoint nature of the available transport facilities.

关键词： Intelligent transportation systems Process planning XML USA Councils computer science Educational institutions Bridges Routing Information systems Internet

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Vs Golf - Developing Location-based Multi-Player Games

Vs Golf - Developing Location-based Multi-Player Games

引用

IEEE Annual International computer Software and Applications Conference (COMPSAC)

作者： Georg Treu Johannes Martens Matthias Schicker Marc Breisinger Axel Kupper Mobile & Distributed Systems Group Department of Computer Science Ludwig-Maximillians-Universität Munich Germany

Location-based multi-player games are currently being pushed by the industry, one main factor being that highly-accurate positioning technologies like GPS as well as broadband mobile networks like UMTS are finally getting widespread. Nevertheless, generic frameworks for efficiently managing user locations are still missing, which strongly complicates game development. This paper presents TraX, a device-centric framework for Location- based Services, which especially supports proactive and multi-player services and thus perfectly matches the challenges mobile game development faces today. The suitability of TraX is evaluated by means of VsGolf, an actual location-based multi-player game, which has been developed and tested by students in only four days.

关键词： Games Global Positioning System Mobile handsets Cellular phones Mobile computing 3G mobile communication Mobile radio mobility management computer science computer industry Toy industry

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Coherence multiplex system topologies

Coherence multiplex system topologies

引用

作者： Meijerink, Arjan Taniman, Robert O. Heideman, Geert H. L. M. Van Etten, Wim IEEE Telecommunication Engineering Group Faculty of Electrical Engineering Mathematics and Computer Science University of Twente 7500 AE Enschede Netherlands Department of Design and Analysis of Communication Systems Faculty of Electrical Engineering Mathematics and Computer Science University of Twente 7500 AE Enschede Netherlands

Coherence multiplexing is a potentially inexpensive form of optical code-division multiple access, which is particularly suitable for short-range applications with moderate bandwidth requirements, such as access networks, LANs, or interconnects. Various topologies are known for constructing an optical transmission system in which several channels are coherence-multiplexed in one optical fiber. In this paper, the parallel array, the intrinsic reference ladder (IRL), and the discontinuous series system topologies will be further considered and compared with respect to code orthogonality requirements, theoretical performance, and some practical implementation aspects. A modification to the IRL system is proposed, resulting in a significant improvement in the theoretical performance. © 2007 IEEE.

关键词： Optical communication

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Analyzing IKEv2 performance when protecting mobile IPv6 signaling

Analyzing IKEv2 performance when protecting mobile IPv6 sign...

引用

4th IEEE International Symposium on Wireless communication systems 2007, ISWCS'07

作者： Faigl, Zoltán Lindskog, Stefan Brunstrom, Anna Mobile Innovation Center Budapest University of Technology and Economics Budapest Hungary Department of Computer Science Karlstad University Karlstad Sweden Centre for Quantifiable Quality of Service in Communication Systems Norwegian University of Science and Technology Trondheim Norway

ISBN: (纸本)1424409799

This paper describes an analysis of the performance overheads caused by the processing and space requirements of the IKEv2 protocol using Diameter and EAP-TLS authentication when protecting Mobile IPv6 signaling. IKEv2 negotiation between mobile nodes, the home agent, and the AAA server in a large-scale reference scenario is considered. The analysis is based on queuing theory and focuses on the overall utilization of the home agent and the AAA server by the IKEv2 reauthentication processes as well as the total mean response time for such a process in the network. © 2007 IEEE.

关键词： Internet protocols

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Ontology Evaluation and Ranking using OntoQA

Ontology Evaluation and Ranking using OntoQA

引用

International Conference on Semantic Computing

作者： Samir Tartir I. Budak Arpinar Large-Scale Distributed Information Systems Lab Department of Computer Science University of Georgia Athens GA USA

Ontologies form the cornerstone of the Semantic Web and are intended to help researchers to analyze and share knowledge, and as more ontologies are being introduced, it is difficult for users to find good ontologies related to their work. Therefore, tools for evaluating and ranking the ontologies are needed. In this paper, we present OntoQA, a tool that evaluates ontologies related to a certain set of terms and then ranks them according a set of metrics that captures different aspects of ontologies. Since there are no global criteria defining how a good ontology should be, OntoQA allows users to tune the ranking towards certain features of ontologies to suit the need of their applications. We also show the effectiveness of OntoQA in ranking ontologies by comparing its results to the ranking of other comparable approaches as well as expert users.

关键词： Ontologies Semantic Web distributed computing Large-scale systems distributed information systems computer science Information analysis Bioinformatics Biology computing Humans

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RAxML-cell: Parallel phylogenetic tree inference on the cell broadband engine

RAxML-cell: Parallel phylogenetic tree inference on the cell...

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21st International Parallel and distributed Processing Symposium, IPDPS 2007

作者： Blagojevic, Filip Stamatakis, Alexandros Antonopoulos, Christos D. Nikolopoulos, Dimitrios S. Department of Computer Science Center for High-end Computing Systems 660 McBryde Hall Blacksburg VA 24061 School of Computer and Communication Sciences École Polytechnique Fédérale de Lausanne Station 14 Ch-1015 Lausanne Switzerland Department of Computer Science College of William and Mary and Greek Armed Forces Division of Research and Informatics

ISBN: (纸本)1424409101

Computational phytogeny is a challenging application even for the most powerful supercomputers. It is also an ideal candidate for benchmarking emerging multiprocessor architectures, because it exhibits fine- and coarse-grain parallelism at multiple levels. In this paper, we present the porting, optimization, and evaluation of RAxML on the Cell Broadband Engine. RAxML is a provably efficient, hill climbing algorithm for computing phylogenetic trees, based on the Maximum Likelihood (ML) method. The Cell Broadband Engine, a heterogeneous multi-core processor with SIMD accelerators which was initially marketed for set-top boxes, is currently being deployed on supercomputers and high-end server architectures. We present both conventional and unconventional, Cell-specific optimizations for RAxML's search algorithm on a real Cell multiprocessor. While exploring these optimizations, we present solutions to problems related to floating point code execution, complex control flow, communication, scheduling, and multilevel parallelization on the Cell. © 2007 IEEE.

关键词： XML

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A Dynamic Critical Path Algorithm for Scheduling Scientific Workflow Applications on Global Grids

A Dynamic Critical Path Algorithm for Scheduling Scientific ...

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IEEE International Conference on e-science and Grid Computing

作者： Mustafizur Rahman Srikumar Venugopal Rajkumar Buyya Grid Computing and Distributed Systems (GRIDS) Laboratory Department of Computer Science and Software Engineering University of Melbourne Australia

Effective scheduling is a key concern for the execution of performance driven grid applications. In this paper, we propose a dynamic critical path (DCP) based workflow scheduling algorithm that determines efficient mapping of tasks by calculating the critical path in the workflow task graph at every step. It assigns priority to a task in the critical path which is estimated to complete earlier. Using simulation, we have compared the performance of our proposed approach with other existing heuristic and meta-heuristic based scheduling strategies for different type and size of workflows. Our results demonstrate that DCP based approach can generate better schedule for most of the type of workflows irrespective of their size particularly when resource availability changes frequently.

关键词： Heuristic algorithms Scheduling algorithm Dynamic scheduling Processor scheduling Grid computing Application software Availability Electrical capacitance tomography Software algorithms Laboratories

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Aneka: Next-Generation Enterprise Grid Platform for e-science and e-Business Applications

Aneka: Next-Generation Enterprise Grid Platform for e-Scienc...

引用

IEEE International Conference on e-science and Grid Computing

作者： Xingchen Chu Krishna Nadiminti Chao Jin Srikumar Venugopal Rajkumar Buyya Grid Computing and Distributed Systems (GRIDS) Laboratory Department of Computer Science and Software Engineering University of Melbourne Australia

In this paper, we present the design of Aneka, a .NET based service-oriented platform for desktop grid computing that provides: (i) a configurable service container hosting pluggable services for discovering, scheduling and balancing various types of workloads and (ii) a flexible and extensible framework/API supporting various programming models including threading, batch processing, MPI and dataflow. Users and developers can easily use different programming models and the services provided by the container to run their applications over desktop Grids managed by Aneka. We present the implementation of both the essential and advanced services within the platform. We evaluate the system with applications using the grid task and dataflow models on top of the infrastructure and conclude with some future directions of the current system.

关键词： Grid computing Object oriented modeling Containers Personal communication networks Application software Processor scheduling Data security Peer to peer computing Authentication Resource management

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Integrated Risk Analysis for a Commercial Computing Service

Integrated Risk Analysis for a Commercial Computing Service

引用

International Symposium on Parallel and distributed Processing (IPDPS)

作者： Chee Shin Yeo Rajkumar Buyya Grid Computing and Distributed Systems Laboratory Department of Computer Science and Software Engineering University of Melbourne VIC Australia

Utility computing has been anticipated to be the next generation of computing usage. Users have the freedom to easily switch to any commercial computing service to complete jobs whenever the need arises and simply pay only on usage, without any investment costs. A commercial computing service however has certain objectives or goals that it aims to achieve. In this paper, we identify three essential objectives for a commercial computing service: (i) meet SLA, (ii) maintain reliability, and (iii) earn profit. This leads to the problem of whether a resource management policy implemented in the commercial computing service is able to meet the required objectives or not. So, we also develop two evaluation methods that are simple and intuitive: (i) separate and (ii) integrated risk analysis to analyze the effectiveness of resource management policies in achieving the required objectives. Evaluation results based on five policies successfully demonstrate the applicability of separate and integrated risk analysis to assess policies in terms of the required objectives.

关键词： Risk analysis Resource management Grid computing distributed computing Switches Maintenance Investments Laboratories computer science Software engineering

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