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19th International Conference on Software engineering and Data engineering 2010, SEDE 2010

作者： Chaudhari, Mahesh B. Dietrich, Suzanne W. School of Computing Informatics and Decision Systems Engineering Arizona State University Tempe AZ 85287-8809 United States Division of Mathematical and Natural Sciences Arizona State University Phoenix AZ 85069-7100 United States

ISBN: (纸本)9781617386077

Enterprise-level applications are becoming complex with the need for event and stream processing, multiple query processing and data analysis over heterogeneous data sources such as relational databases and XML data. Such applications require access to the metadata information for these different data sources. This paper discusses the design and implementation of a service-based dynamic metadata repository over heterogeneous data sources in a distributed event stream processing environment. The metadata repository is dynamic such that data resources can be registered or unregistered at run time. The design of such a metadata database is the first step in researching multiple query optimization over various query expressions to detect and materialize common subexpressions over relational and XML structured data sources.

关键词： Metadata

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Intercalating the social and the technical: Socially robust and enduring computing 10

Intercalating the social and the technical: Socially robust ...

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Proceedings of the 11th Biennial Participatory Design Conference

作者： Hakken, David Teli, Maurizio D'Andrea, Vincenzo School of Informatics and Computing Indiana University Bloomington Bloomington IN United States Science and Society Area Museo Tridentino di Scienze Naturali Trento Italy Department of Information Engineering and Computer Science University of Trento Trento Italy

ISBN: (纸本)9781450301312

This short paper presents our research agenda for a more socially oriented software production, drawing upon the empirical evidences of failure of software organisation in providing enduring software. Constructing a socio-technical perspective on the basis of social sciences research on technology, we outline a research program aimed at building software that could be more reliable and be useful longer. Our guiding principles are the symmetry between the social and the technical, and their intercalation in the development process, and Participatory Design is one of our foundational disciplines. Copyright 2010 ACM 978.

关键词： Social sciences computing

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Utilizing dynamic molecular modelling technique for predicting changes in complex social networks

Utilizing dynamic molecular modelling technique for predicti...

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2010 3rd IEEE/WIC/ACM International Conference on Web Intelligence and Intelligent Agent Technology - Workshops, WI-IAT 2010

作者： Juszczyszyn, Krzysztof Musial, Anna Musial, Katarzyna Bródka, Piotr Institute of Informatics Wroclaw University of Technology Poland Institute of Physics Wroclaw University of Technology Poland School of Design Engineering and Computing Bournemouth University United Kingdom Telnet Sp. z o.o. Wroclaw Poland

ISBN: (纸本)9780769541914

We present a method that utilises dynamic molecular modelling technique to track the changes within complex social network. The users forming a social network are interpreted as large sets of interacting particles. The data for the conducted research was obtained from e-mail communication within Enron company. The social network of employees was extracted and used to evaluate the methodology of social network dynamics modelling. © 2010 IEEE.

关键词： Complex networks

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Power efficient voltage islanding for Systems-on-chip from a floorplanning perspective 10

Power efficient voltage islanding for Systems-on-chip from a...

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Design, Automation and Test in Europe Conference and Exhibition

作者： Pavel Ghosh Arunabha Sen Computer Science and Engineering Program School of Computing Informatics and Decision Systems Engineering Arizona State University Tempe AZ USA

ISBN: (纸本)9783981080162

Power consumption can be significantly reduced in Systems-on-Chip (SoC) by scaling down the voltage levels of the Processing Elements (PEs). The power efficiency of this Voltage Islanding technique comes at the cost of energy and area overhead due to the level shifters between voltage islands. Moreover, from the physical design perspective it is not desirable to have an excessive number of voltage islands on the chip. Considering voltage islanding at an early phase of design as during floorplanning of the PEs can address various of these issues. In this paper, we propose a new cost function for the floorplanning objective different from the traditional floorplanning objective. The new cost function not only includes the overall area requirement, but also incorporates the overall power consumption and the design constraint imposed on the maximum number of voltage islands. We propose a greedy heuristic based on the proposed cost function for the floorplanning of the PEs with several voltage islands. Experimental results using benchmark data study the effect of several parameters on the outcome of the heuristic. It is evident from the results that power consumption can be significantly reduced using our algorithm without significant area overhead. The area obtained from the heuristic is also compared with the optimal, and found to be within 4% of the optimal on average, when area minimization is given the priority.

关键词： Voltage Energy consumption Cost function Power engineering and energy Minimization Very large scale integration Computer science Power engineering computing informatics Systems engineering and theory

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Constructing min-cost single failure immune recovery trees: Computational complexity and approximation algorithms

Constructing min-cost single failure immune recovery trees: ...

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International Symposium on Advanced Networks and Telecommunication Systems (ANTS)

作者： Xi Fang Dejun Yang Guoliang Xue Krishnaiyan Thulasiraman School of Computing Informatics and Decision Systems Engineering Arizona State University USA School of Computer Science University of Oklahoma USA

In this paper, we study the problem of constructing min-cost single-link/node failure immune recovery trees for two-edge/vertex connected networks. We prove its NP-hardness, and present a general framework of efficient approximation algorithms for solving this problem. Based on this framework, we present two realizations: 1) for link failure protection, our realization has an approximation ratio of 2 and O(nlog n(m +nlogn)) running time if different links have different costs, or an approximation ratio of 1.5 and a linear running time if all links have the same cost; 2) for node failure protection, our realization has an approximation ratio of 2 and O(n 3 m) running time if different links have different costs, or an approximation ratio of 5/3 and a linear running time if all links have the same cost.

关键词： Approximation methods Educational institutions Wavelength division multiplexing Nonlinear optics

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Energy efficient mapping and voltage islanding for regular NoC under design constraints

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International Journal of High Performance Systems Architecture 2010年第3-4期2卷 132-144页

作者： Ghosh, Pavel Sen, Arunabha Computer Science Program School of Computing Informatics and Decision Systems Engineering Arizona State University Tempe AZ 85281 United States

Computational energy consumption of the processing elements (PEs) of a NoC can be significantly reduced by scaling down their voltage levels. This creates clusters of adjacent PEs operating at the same voltage level, known as voltage islands. Excessive number of voltage islands is undesirable from the physical design perspective and due to the overhead of level shifter energy consumption between adjacent voltage islands. Considering these issues during mapping of the PEs to the NoC routers, can potentially lead to acceptable solutions with reduced overall energy consumption. In this paper, we formulate the mapping problem as an optimisation problem. We present both optimal solution, obtained by solving a mixed integer linear program (MILP), and heuristic solution based on random greedy selection. Experimental results using benchmark and real applications show that the heuristic finds near-optimal solution in almost all cases in a very small fraction of the time required to achieve the optimal solution. Copyright © 2010 Inderscience Enterprises Ltd.

关键词： Network-on-chip

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A method for group extraction in complex social networks

A method for group extraction in complex social networks

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3rd World Summit on the Knowledge Society, WSKS 2010

作者： Bródka, Piotr Musial, Katarzyna Kazienko, Przemyslaw Institute of Informatics Wroclaw University of Technology Wyb.Wyspiańskiego 27 50-370 Wroclaw Poland School of Design Engineering and Computing Bournemouth University Poole Dorset BH12 5BB United Kingdom

ISBN: (纸本)3642163173

The extraction of social groups from social networks existing among employees in the company, its customers or users of various computer systems became one of the research areas of growing importance. Once we have discovered the groups, we can utilise them, in different kinds of recommender systems or in the analysis of the team structure and communication within a given population. The shortcomings of the existing methods for community discovery and lack of their applicability in multi-layered social networks were the inspiration to create a new group extraction method in complex multi-layered social networks. The main idea that stands behind this new concept is to utilise the modified version of a measure called by authors multi-layered clustering coefficient. © 2010 Springer-Verlag.

关键词： Extraction

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An Adaptive Content Sharing Protocol for P2P Mobile Social Networks

An Adaptive Content Sharing Protocol for P2P Mobile Social N...

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International Conference on Advanced Information Networking and Applications Workshops (AINAW)

作者： Basit Qureshi Geyong Min Demetres Kouvatsos Mohammad Ilyas School of Computing Informatics and Media University of Bradford Bradford UK College of Engineering Florida Atlantic University USA

In Mobile Social Networks (MSN) users can participate in communication based on their mutual interests. Typical implementations of Social Networks involve client/server architecture where a user needs to subscribe to a server for content sharing with other clients. Popular Online Social Network providers have recently extended the web based service into the mobile domain. However due to mobility and connectivity issues this architecture is in-adequate in providing peer to peer content sharing services to mobile users. Many solutions for Mobile Ad Hoc networks have been proposed however content based communication in partially or intermittently connected MANETs has been a recent research area. In this paper we present an adaptive protocol to facilitate implementation of a Mobile Social Network based on peer to peer content driven communication when end-to-end connectivity is not possible. The proposed protocol takes into account the information about user's interests, content based data storing and forwarding, and host mobility in a disconnected, delay tolerant MANET.

关键词： Protocols Social network services Mobile communication Mobile ad hoc networks Disruption tolerant networking Network servers Mobile computing Internet Peer to peer computing Network topology

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Multi-layered social network creation based on bibliographic data

Multi-layered social network creation based on bibliographic...

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IEEE International Conference on Social computing

作者： Kazienko, Przemyslaw Bródka, Piotr Musial, Katarzyna Gaworecki, Jaroslaw Institute of Informatics Wroclaw University of Technology Wroclaw Poland School of Design Engineering and Computing Bournemouth University Poole United Kingdom Telnet Sp. Z O.o Wroclaw Poland Research and Engineering Center Sp. Z O.o Wroclaw Poland

ISBN: (纸本)9780769542119

A method for extraction of the multi-layered social network based on the data about human collaborative achievements, in particular scientific papers, is presented in the paper. The objects linking people form a hierarchy, which is flattened in the pre-processing stage. Only one level of the hierarchy remains together with new activities moved from its other levels. Separate layers of the multi-layered social network are created based on these pre-processed activities. © 2010 IEEE.

关键词： Network layers

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Interface effect on the dynamic stress around an elliptical nano-inhomogeneity subjected to anti-plane shear waves

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Computers, Materials and Continua 2010年第3期16卷 229-246页

作者： Fang, Xue-Qian Wang, Xiao-Hua Zhang, Le-Le Department of Engineering Mechanics Shijiazhuang Railway Institute Shijiazhuang 050043 China School of Computing and Informatics Shijiazhuang Railway Institute Shijiazhuang 050043 China

In the design of advanced micro- and nanosized materials and devices containing inclusions, the effects of surfaces/interfaces on the stress concentration become prominent. In this paper, based on the surface/interface elasticity theory, a two-dimensional problem of an elliptical nano-inhomogeneity under anti-plane shear waves is considered. The conformal mapping method is then applied to solve the formulated boundary value problem. The analytical solutions of displacement fields are expressed by employing wave function expansion method, the expanded mode coefficients are determined by satisfying the boundary conditions at the interfaces of the nano-inhomogeneity. Analyses show that the effect of the interfacial properties on the dynamic stress is significantly related to the wave frequency of incident waves, the shear modulus ratio of the nano-inhomogeneity and the matrix, and the dimensions of the elliptical nano-inhomogeneity. Comparison with the previous results is also presented. Copyright © 2010 Tech Science Press.

关键词： Interfaces (materials)

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