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14th SIAM International Conference on Data Mining, SDM 2014

作者： Peherstorfer, Benjamin Pflüger, Dirk Bungartz, Hans-Joachim Aerospace Computational Design Laboratory AeroAstro Massachusetts Institute of Technology United States Simulation of Large Systems Group Institute for Parallel and Distributed Systems University of Stuttgart Germany Scientific Computing Group Department of Computer Science Technische Universität München Germany

ISBN: (纸本)9781510811515

Nonparametric density estimation is a fundamental problem of statistics and data mining. Even though kernel density estimation is the most widely used method, its performance highly depends on the choice of the kernel bandwidth, and it can become computationally expensive for large data sets. WTe present an adaptive sparse-grid-based density estimation method which discretizes the estimated density function on basis functions centered at grid points rather than on kernels centered at the data points. Thus, the costs of evaluating the estimated density function are independent from the number of data points. We give details on how to estimate density functions on sparse grids and develop a cross validation technique for the parameter selection. We show numerical results to confirm that our sparse-grid-based method is well-suited for large data sets, and, finally, employ our method for the classification of astronomical objects to demonstrate that it is competitive to current kernel-based density estimation approaches with respect to classification accuracy and runtime. Copyright © SIAM.

关键词： Data mining

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ANCAEE: A Novel Clustering Algorithm for Energy Efficiency in Wireless Sensor Networks

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Wireless Sensor Network 2011年第9期3卷 307-312页

作者： A. P. Abidoye N. A. Azeez A. O. Adesina K. K. Agbele Wireless Sensor Networks & Natural Language Research Group Grid Computing & Distributed Systems Laboratory Department of Computer Science University of the Western Cape

One of the major constraints of wireless sensor networks is limited energy available to sensor nodes because of the small size of the batteries they use as source of power. Clustering is one of the routing techniques that have been using to minimize sensor nodes’ energy consumption during operation. In this paper, A Novel Clustering Algorithm for Energy Efficiency in Wireless Sensor Networks (ANCAEE) has been proposed. The algorithm achieves good performance in terms of minimizing energy consumption during data transmission and energy consumptions are distributed uniformly among all nodes. ANCAEE uses a new method of clusters formation and election of cluster heads. The algorithm ensures that a node transmits its data to the cluster head with a single hop transmission and cluster heads forward their data to the base station with multi-hop transmissions. Simulation results show that our approach consumes less energy and effectively extends network utilization.

关键词： Sensor Nodes Clusters Cluster heads Wireless Sensor Networks Base Station Clustering Algorithms Energy Efficiency

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Succinct representations in collaborative filtering: A case study using wavelet tree on 1,000 cores 20

Succinct representations in collaborative filtering: A case ...

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20th International Conference on Parallel and distributed computing, Applications and Technologies, PDCAT 2019

作者： Peng, Xiangjun Wang, Qingfeng Sun, Xu Gong, Chunye Wang, Yaohua User-Centric Computing Group University of Nottingham Ningbo China China Department of Computer Science and Technology National University of Defense Technology China Science and Technology on Parallel and Distributed Processing Laboratory National University of Defense Technology China

ISBN: (纸本)9781728126166

User-Item (U-I) matrix has been used as the dominant data infrastructure of Collaborative Filtering (CF). To reduce space consumption in runtime and storage, caused by data sparsity and growing need to accommodate side information in CF design, one needs to go beyond the U-I Matrix. In this paper, we took a case study of Succinct Representations in Collaborative Filtering, rather than using a U-I Matrix. Our key insight is to introduce Succinct Data Structures as a new infrastructure of CF. Towards this, we implemented a User-based K-Nearest-Neighbor CF prototype via Wavelet Tree, by first designing a Accessible Compressed Documents (ACD) to compress U-I data in Wavelet Tree, which is efficient in both storage and runtime. Then, we showed that ACD can be applied to develop an efficient intersection algorithm without decompression, by taking advantage of ACD's characteristics. We evaluated our design on 1,000 cores of Tianhe-II supercomputer, with one of the largest public data set ml-20m. The results showed that our prototype could achieve 3.7 minutes on average to deliver the results. © 2019 IEEE.

关键词： Collaborative filtering

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A Wireless Public Access Infrastructure for Supporting Mobile Context-Aware IPv6 Applications 01

A Wireless Public Access Infrastructure for Supporting Mobil...

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1st Workshop on Wireless Mobile Internet, WMI 2001

作者： Friday, Adrian Wu, Maomao Schmid, Stefan Finney, Joe Cheverst, Keith Davies, Nigel Distributed Multimedia Research Group Computing Department Lancaster University Bailrigg LancasterLA1 4YR United Kingdom Computer Science Department Gould-Simpson Building University of Arizona TucsonAZ United States

ISBN: (纸本)1581134231

This paper presents a novel wireless access point architecture designed to support the development of next generation mobile context-aware applications over metropolitan scale areas. In addition, once deployed, this network will allow ordinary citizens secure, accountable and convenient access to the Internet from their local city and campus environments. The proposed architecture is based on an approach utilising a modified Mobile IPv6 protocol stack that uses packet marking and network level packet filtering at the edge of the wired network to achieve this objective. The paper describes this architecture in detail and contrasts it with existing systems to highlight the key benefits of our approach. © 2001 ACM.

关键词： Network architecture

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Base62x: An Alternative Approach to Base64 for non-Alphanumeric Characters

Base62x: An Alternative Approach to Base64 for non-Alphanume...

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2011 Eighth International Conference on Fuzzy System and Knowledge Discovery(第八届模糊系统与知识发现国际会议 FSKD 2011)

作者： Zhenxing Liu Richard Hill Lu Liu Yongzhao Zhan Distributed and Intelligent Systems Research Group School of Computing and Mathematics University Distributed and Intelligent Systems Research Group School of Computing and Mathematics University School of Computer Science and Telecommunication Engineering Jiangsu University Jiangsu China

In computer systems, printable characters include not only 62 alphanumeric characters (0-9, a-z and A-Z) but also non-alphanumeric characters (e.g. *, \, ∧, ％). Base64 is a commonly used encoding scheme that represents binary data in an ASCII string format However, for Base64, non-alphanumeric characters (e.g. *, \, ∧, ％) are problematic for filenames and URLs. For example, “+” is error-prone in URL and “/” is not allowed in filenames. To address this issue, we propose a new method, Base62x, as an alternative approach to Base64. The proposed method is more effective in application development and fully compatible with symbol-sensitive applications, such as, file systems, IP addresses and safe transmission of non-ASCII over the Internet.

关键词： Base62x Base64 Numeric notation Basel6

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An environment for workflow applications on wide-area distributed systems

An environment for workflow applications on wide-area distri...

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Annual Hawaii International Conference on System Sciences (HICSS)

作者： H.A. James K.A. Hawick P.D. Coddington Distributed and High Performance Computing Research Group School of Informatics University of Wales Bangor Gwynedd UK Distributed and High Performance Computing Research Group Department of Computer Science University of Adelaide Adelaide SA Australia

ISBN: (纸本)0769509819

Workflow techniques are emerging as an important approach for the specification and management of complex processing tasks. This approach is especially powerful for utilising distributed data and processing resources in widely-distributed heterogeneous systems. We describe our DISCWorld distributed workflow environment for composing complex processing chains, which are specified as a directed acyclic graph of operators. Users of our system can formulate processing chains using either graphical or scripting tools. We have deployed our system for image processing applications and decision support systems. We describe the technologies we have developed to enable the execution of these processing chains across wide-area computing systems. In particular, we present our distributed Job Placement Language (based on XML) and various Java interface approaches we have developed for implementing the workflow metaphor. We outline a number of key issues for implementing a high-performance, reliable, distributed workflow management system.

关键词： distributed computing computer aided instruction High performance computing Java Physics computing Informatics computer science Power system management Image processing Decision support systems

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A reconfigurable component-based problem solving environment

A reconfigurable component-based problem solving environment

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Annual Hawaii International Conference on System Sciences (HICSS)

作者： K.A. Hawick H.A. James P.D. Coddington Distributed and High Performance Computing Research Group School of Informatics University of Wales Bangor Gwynedd UK Distributed and High Performance Computing Research Group Department of Computer Science University of Adelaide Adelaide SA Australia

ISBN: (纸本)0769509819

Problem solving environments are an attractive approach to the integration of calculation and management tools for various scientific and engineering applications. These applications often require high performance computing components in order to be computationally feasible. It is therefore a challenge to construct integration technology, suitable for problem solving environments, that allows both flexibility as well as the embedding of parallel and high performance computing systems. Our DISCWorld system is designed to meet these needs and provides a Java-based middleware to integrate component applications across wide-area networks. Key features of our design are the abilities to: access remotely stored data; compose complex processing requests either graphically or through a scripting language; execute components on heterogeneous and remote platforms; reconfigure task subgraphs to run across multiple servers. Operators in task graphs can be slow (but portable) pure Java implementations or wrappers to fast (platform specific) supercomputer implementations.

关键词： Problem-solving High performance computing Application software Java Middleware distributed computing Robust stability Informatics computer science Environmental management

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Focus group report: Capturing architectural knowledge with architectural patterns

Focus group report: Capturing architectural knowledge with a...

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11th European Conference on Pattern Languages of Programs, EuroPLoP 2006

作者： Harrison, Neil B. Avgeriou, Paris Zdun, Uwe Department of Computer Science and Engineering Utah Valley State College Orem UT United States Department of Mathematics and Computing Science University of Groningen Groningen Netherlands Distributed Systems Group Information Systems Institute Vienna University of Technology Vienna Austria

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Mobile ad hoc communication issues in ubiquitous computing - The smart-its experimentation platforms

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2003年 2775卷 213-218页

作者： Schmidt, Albrecht Siegemund, Frank Beigl, Michael Antifakos, Stavros Michahelles, Florian Gellersen, Hans-W. Media Informatics Group University of Munich Germany Distributed Systems Group ETH Zurich Switzerland TecO University of Karlsruhe Germany Perceptual Computing and Computer Vision Group ETH Zurich Switzerland Computing Department Lancaster University United Kingdom

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Spotlights on network operations and management research in Latin America - A report on LANOMS 2005

Spotlights on network operations and management research in ...

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作者： Granville, Lisandro Zambenedetti Gaspary, Luciano Paschoal Schulze, Bruno De Souza, José Neuman Brazil Special Interest Group on Computer Networks and Distributed Systems Brazilian Computer Society Brazil Brazilian Laboratory on Computer Networks Brazil IFIP/IEEE im Brazil Graduate Program on Applied Computing Universidade do Vale do Rio dos Sinos Brazil IEEE Communications Society Japan National Lab. for Scientific Computing - LNCC Brazil Brazilian National Research Council CNPq Brazil ACM Brazil IEEE Brazil Brazilian Computing Society Brazil Federal University of Ceará Brazil

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