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Building the data warehouse of frequent itemsets in the DWFIST approach

引用

15th International Symposium on Methodologies for Intelligent systems, ISMIS 2005

作者： Monteiro, Rodrigo Salvador Zimbrão, Geraldo Schwarz, Holger Mitschang, Bernhard De Souza, Jano Moreira Computer Science Department Graduate School of Engineering Federal University of Rio de Janeiro PO Box 68511 21945-970 Rio de Janeiro Brazil Institute f. Parallel and Distributed Systems University of Stuttgart Universitaetsstr. 38 70569 Stuttgart Germany Computer Science Department Institute of Mathematics UFRJ Brazil

ISBN: (纸本)3540258787

Some data mining tasks can produce such great amounts of data that we have to cope with a new knowledge management problem. Frequent itemset mining fits in this category. Different approaches were proposed to handle or avoid somehow this problem. All of them have problems and limitations. In particular, most of them need the original data during the analysis phase, which is not feasible for data streams. The DWFIST (Data Warehouse of Frequent ItemSets Tactics) approach aims at providing a powerful environment for the analysis of itemsets and derived patterns, such as association rules, without accessing the original data during the analysis phase. This approach is based on a Data Warehouse of Frequent Itemsets. It provides frequent itemsets in a flexible and efficient way as well as a standardized logical view upon which analytical tools can be developed. This paper presents how such a data warehouse can be built. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Data warehouses

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A hierarchical cluster algorithm for dynamic, centralized timestamps

A hierarchical cluster algorithm for dynamic, centralized ti...

引用

International Conference on distributed Computing systems

作者： P.A.S. Ward D.J. Taylor Shoshin Distributed Systems Group Department of Computer Science University of Waterloo Canada

ISBN: (纸本)0769510779

Partial-order data structures used in distributed-system observation tools typically use vector timestamps to efficiently determine event precedence. Unfortunately all current dynamic vector-timestamp algorithms either require a vector of size equal to the number of processes in the computation or require a graph search operation to determine event precedence. This fundamentally limits the scalability of such observation systems. In this paper we present an algorithm for hierarchical, clustered vector time-stamps. We present results for a variety of computation environments that demonstrate such timestamps can reduce space consumption by more than an order-of-magnitude over Fidge/Mattern timestamps while still providing acceptable time bounds for computing timestamps and determining event precedence.

关键词： Clustering algorithms Heuristic algorithms distributed computing Data structures Control systems Monitoring Scalability Data visualization computer science Costs

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Performance analysis of computational approaches to solve Multiple Sequence Alignment

Performance analysis of computational approaches to solve Mu...

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作者： Montañola, Alberto Roig, Concepció Guirado, Fernando Hernández, Porfidio Notredame, Cedric Distributed Computing Group Computer Science and Industrial Engineering Department Universitat de Lleida Lleida Spain Computer Architecture and Operating Systems Department Universitat Autònoma de Barcelona Cerdanyola del Vallès Spain Barcelona Spain

In the biotechnology field, the deployment of the Multiple Sequence Alignment (MSA) problem, which is a high performance computing demanding process, is one of the new challenges to address on the new parallel systems. The aim of this problem is to find similar regions on biological sequences. Furthermore, the goal of MSA applications is to align as much sequences as possible with a level of quality that makes the alignment biologically meaningful. An efficiency study of different MSA implementations, based on T-Coffee (one of the most used MSA aligners), has been performed in order to find new optimizations that may improve the average execution time on multi-core systems. We found that the current parallel implementations have some performance issues, affecting negatively the scalability of the process. Finally, the proposed implementation based on the usage of threads in conjunction with a message-passing library is presented, with the aim to optimize the execution of the MSA problem in multi-core-based clusters. © 2012 Springer science+Business Media, LLC.

关键词： Message passing

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Using message-based threading for multimedia applications

Using message-based threading for multimedia applications

引用

IEEE International Conference on Multimedia and Expo (ICME)

作者： R. Koster T. Kramp Distributed Systems Group Department of Computer Science University of Kaiserslautern Kaiserslautern Germany

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Delivering QoS in open distributed systems

Delivering QoS in open distributed systems

引用

IEEE Workshop on Future Trends of distributed Computing systems

作者： F. Siqueira V. Cahill Distributed Systems Group Department of Computer Science Trinity College Dublin Ireland

This paper describes an architecture that provides support for quality of service (QoS) in open systems. The Quartz QoS architecture aims to avoid the dependency on specific platforms that limits the application of most existing QoS architectures in open, heterogeneous and distributed systems. Quartz adopts a flexible and extensible platform-independent design that allows its internal components to be rearranged dynamically, adapting the architecture to the surrounding environment in order to accommodate the differences among diverse computing platforms. Further significant problems found in other QoS architectures, such as the lack of transparency, flexibility and expressiveness in the specification of QoS requirements and limited support for resource adaptation, are also addressed by quartz. This paper compares Quartz to other QoS architectures found in the literature, presents a prototype implementation of Quartz, and shows how Quartz is integrated with CORBA to form a framework for control and transfer of streaming media.

关键词： Quality of service computer architecture Middleware Open systems Protocols computer science Educational institutions Application software Prototypes Streaming media

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Dynamic grid-based multicast group assignment in data distribution management

Dynamic grid-based multicast group assignment in data distri...

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International Workshop/Symposium on distributed Simulation and Real-Time Applications (DS-RT)

作者： A. Boukerche A. Roy N. Thomas Parallel Simulation and Distributed Systems (PARADISE) Research Lab Computer Science Department University of North Texas USA

Data distribution management (DDM) is one of the services defined by the DoD High Level Architecture. DDM is necessary to provide efficient, scalable mechanisms for distributing state updates and interaction information in large scale distributed simulations. We describe data distribution management mechanisms (also known as filtering) used for real time training simulations. We propose a new DDM approach to multicast group allocation, which we refer to as a dynamic grid-based allocation. Our scheme is based on a combination of a fixed grid-based method, known for its low overhead and ease of implementation, and a sender-based strategy, which uses fewer multicast groups than the fixed grid-based method. We describe our DDM algorithm, its implementation, and report on the performance results that we have obtained using the RTI-Kit framework. These results include the outcome of experiments comparing our approach to the fixed grid-based method, and they show that our scheme is scalable and significantly reduces the message overhead of previous grid-based allocation schemes.

关键词： distributed decision making Computational modeling Management training Discrete event simulation computer simulation computer science computer architecture Large-scale systems Filtering Multicast algorithms

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A rule management framework for negotiating mobile agents

A rule management framework for negotiating mobile agents

引用

International Conference on Enterprise distributed Object Computing (EDOC)

作者： M.T. Tu C. Kunze W. Lamersdorf Distributed Systems Group Computer Science Department University of Hamburg Hamburg Germany

Proposes an application framework for mobile agents which provides rule-based generic services to support the three phases of a market transaction (information phase, contracting phase and settlement phase). It is described within the four views of an electronic market (the business view, the transaction view, the services view and the infrastructure view) which describe organizational as well as technological aspects. The focus of this paper is on the technological aspects of the contracting phase in which the participating agents carry out an automated negotiation process to determine the terms of contract.

关键词： Mobile agents Contracts Consumer electronics Logic Automation Automatic control computer science Application software Middleware Software agents

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An offline algorithm for dimension-bound analysis

An offline algorithm for dimension-bound analysis

引用

International Conference on parallel Processing (ICPP)

作者： P.A.S. Ward Shoshin Distributed Systems Group Department of Computer Science University of Waterloo Canada

The vector-clock size necessary to characterize causality in a distributed computation is bounded by the dimension of the partial order induced by that computation. In an arbitrary distributed computation, the dimension can be as large as the width, which in turn can be as large as the number of processes in the computation. Most vector clock algorithms, and all online ones, simply use a vector of size equal to the number of processes. In practice the dimension may be much smaller. It is the purpose of the paper to provide empirical evidence that the dimension of various distributed computations is often substantially smaller than the number of processes. We have found that typical distributed computations, with as many as 300 processes, have dimension less than 10. To achieve this quantification, we developed various theorems and algorithms which we also describe.

关键词： Algorithm design and analysis Clocks Debugging distributed computing Displays computer science Military computing Reactive power Electronic switching systems Monitoring

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The object library for parallel simulation (OLPS) 88

The object library for parallel simulation (OLPS)

引用

Proceedings of the 20th conference on Winter simulation

作者： Marc Abrams Distributed Systems Group Department of Computer Science Stanford University Stanford CA

ISBN: (纸本)9780911801422

The Object Library for parallel Simulation (OLPS) is a set of C++ objects from which a parallel, discrete event simulation or simulation language can be built and run on multiprocessor workstations. OLPS provides a common interface to the simulation programmer for several parallel simulation algorithms, including implementations of the Chandy-Misra and Time-Warp algorithms. OLPS also provides instrumentation to compare the performance of each parallel algorithm on the same simulation problem. The system currently runs on the V distributed system on the DEC Firefly.

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Power Management for Stationary Machines in a Pervasive Computing Environment

Power Management for Stationary Machines in a Pervasive Comp...

引用

Annual Hawaii International Conference on System sciences (HICSS)

作者： C. Harris V. Cahill Distributed Systems Group Department of Computer Science Trinity College Dublin Ireland

This paper examines effective power management of users' stationary desktop PCs in a pervasive computing office environment. The objective being to minimise the building's electricity consumption while maintaining acceptable desktop PC performance. Current state of the art power management is focused on developing polices for mobile devices, which are ineffective for stationary machines. Effective stationary policies need to obtain context from the user of the machine, but there is a balance between what detail of context is necessary and how much this extra context costs both monetarily and energy wise. We have implemented two location aware policies which detect presence of the user's Bluetooth enabled mobile phone. Trial results indicate that with these policies it is possible to get within 8% of optimal energy consumption with little performance degrade. However, this is the best case and the results are dependent on the user's usage patterns and the geographical layout of the office.

关键词： Energy management Environmental management Pervasive computing Energy consumption Power system management Personal communication networks Costs Bluetooth Mobile handsets Degradation

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