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6 Papers

Mesh Alignment using Grid based PCA

Topics: Modeling and Algorithms; Scene and Object Modeling; Geometric Computing; Fundamental Methods and Algorithms

Authors: David Kaye and Ioannis Ivrissimtzis

Affiliation: Durham University, United Kingdom

Digital Object Identifier: 10.5220/0005313801740181

Proceedings of GRAPP 2015/VISIGRAPP, ISBN: 978-989-758-087-1

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We present an algorithm for mesh alignment by performing Principal Components Analysis (PCA) on a set of nodes of a regular 3D grid. The use of a 3D lattice external to both inputs increases the robustness of PCA, particularly when dealing with meshes of different and possibly uneven vertex density. The proposed algorithm was tested on meshes that have undergone standard mesh processing operations such as smoothing, simplification and remeshing. In several cases the results indicate an improved robustness compared to performing PCA directly on mesh vertices.
Collapse Button Related Ontology Subjects/Areas/Topics (6)
Computer Vision, Visualization and Computer Graphics

Geometric Computing

Modeling and Algorithms

Fundamental Methods and Algorithms

Geometry and Modeling

Scene and Object Modeling

On Energy-efficient Checkpointing in High-throughput Cycle-stealing Distributed Systems

Topics: Green Data Centers; Virtualization for Reducing Power Consumption; Algorithms for Reduced Power, Energy and Heat; Green Computing Models, Methodologies and Paradigms; Green Communications Architectures and Frameworks

Authors: Matthew Forshaw 1 , A. Stephen McGough 2 and Nigel Thomas 1

Affiliations: 1 Newcastle University, United Kingdom , 2 Durham University, United Kingdom

Digital Object Identifier: 10.5220/0004958302620267

Proceedings of SMARTGREENS 2014, ISBN: 978-989-758-025-3

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Checkpointing is a fault-tolerance mechanism commonly used in High Throughput Computing (HTC) environments to allow the execution of long-running computational tasks on compute resources subject to hardware and software failures and interruptions from resource owners. With increasing scrutiny of the energy consumption of IT infrastructures, it is important to understand the impact of checkpointing on the energy consumption of HTC environments. In this paper we demonstrate through trace-driven simulation on real-world datasets that existing checkpointing strategies are inadequate at maintaining an acceptable level of energy consumption whilst reducing the makespan of tasks. Furthermore, we identify factors important in deciding whether to employ checkpointing within an HTC environment, and propose novel strategies to curtail the energy consumption of checkpointing approaches.
Collapse Button Related Ontology Subjects/Areas/Topics (8)
Algorithms for Reduced Power, Energy and Heat

Green Communications Architectures and Frameworks

Sustainable Computing and Communications

Energy and Economy

Green Computing Models, Methodologies and Paradigms

Virtualization for Reducing Power Consumption
Energy-Aware Systems and Technologies

Green Data Centers

FREQUENCY MODULATED CONTINUOUS TECHNOLOGYFOR RADIO CHANNEL MEASUREMENTS IN THE 60 GHZ BAND

Authors: Stuart M. Feeney 1 and Sana Salous 2

Affiliations: 1 School of Engineering, University of Durham, United Kingdom , 2 Durham University, United Kingdom

Digital Object Identifier: 10.5220/0005414400870093

Proceedings of ICTRS 2012, ISBN: 978-989-8565-28-0

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The architecture of an UWB multi-band channel sounder is presented. The sounder architecture provides an FMCW source to enable measurements in the frequency range up to 1 GHz (which covers the TV white space / digital dividend), the 2.2 – 2.9 GHz band (ISM and LTE) and the 4.4 – 5.9 GHz band (ISM / WiLAN). Additional frequency converters support operation in the 16 GHz and 60 GHz bands. Here we have configured a 2 by 2 MIMO system in the 60 GHz band specifically targeting channel measurements to support the development of on-body networks and short range backhaul communication networks. Performance results in the 2.4 GHz ISM band demonstrate the resolution of the sounder.

Perspectives of Internet based Road Network Traffic Flow Modelling and Control

Author: Apostolos Kotsialos

Affiliation: Durham University, United Kingdom

Digital Object Identifier: 10.5220/0004473100550066

Proceedings of FIATS-M 2011, ISBN: 978-989-8425-87-4

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This paper is concerned with possible future internet applications within the framework of traffic flow modelling and control. Two modelling related uses are described based on the assumption that vehicles in the near future will be equipped with smart on-board devices that can communicate with each other through reliable ad-hoc wireless networks. This capability opens new ways of thinking about traffic flow and requires the explicit consideration of the drivers’ behaviour when more information is available to them pertaining to downstream traffic conditions. Finally, a web-based application for supporting ramp metering is discussed as well.

Validating Search Processes in Systematic Literature Reviews

Authors: Barbara Kitchenham 1 , Zhi Li 2 and Andrew Burn 3

Affiliations: 1 Keele University, United Kingdom , 2 Guangxi Normal University and Peking University, China , 3 Durham University, United Kingdom

Proceedings of EAST 2011/ENASE, ISBN: 978-989-8425-58-4

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Context: Systematic Literature Reviews (SLRs) need to employ a search process that is as complete as possible. It has been suggested that an existing set of known papers can be used to help develop an appropriate strategy. However, it is still not clear how to evaluate the completeness of the resulting search process. Aim: We suggest a means of assessing the completeness of a search process by evaluating the search results on an independent set of known papers. Method: We assess the results of a search process developed using a known set of papers by seeing whether it was able to identify papers from a different set of known papers. Results: Using a second set of known papers, we were able to show that a search process, which was based on a first set of known papers, was unlikely to be complete, even though the search process found all the papers in the first known set. Conclusions: When using a set of known papers to develop a search process, keep a “hold-out” sample to evaluate probable completeness.

EVALUATION OF COLLECTING REVIEWS IN CENTRALIZED ONLINE REPUTATION SYSTEMS

Topics: e-Business and e-Commerce; Social Networks and Organizational Culture; B2B, B2C and C2C; Social Information Systems; Web Information Filtering and Retrieval

Authors: Ling Liu , Malcolm Munro and William Song

Affiliation: Durham University, United Kingdom

Digital Object Identifier: 10.5220/0002763802810286

Proceedings of WEBIST 2010, ISBN: 978-989-674-025-2

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Background: Centralized Online Reputation Systems (ORS) have been widely used by internet companies. They collect users’ opinions on products, transactions and events as reputation information then aggregate and publish the information to the public. Aim: Studies of reputation systems evaluation to date have tended to focus on isolated systems or their aggregating algorithms only. This paper proposes an evaluation mechanism to measure different reputation systems in the same context. Method: Reputation systems naturally have differing interfaces, and track different aspects of user behavior, however, from information system perspective, they all share five underlying components: Input, Processing, Storage, Output and Feedback Loop. Therefore, reputation systems can be divided into these five components and measured by their properties respectively. Results: The paper concentrates on the evaluation of Input and develops a set of simple formulas to represent the cost of reputation information collection. This is then applied to three different sites and the resulting analysis shows the pros and cons of the differing approaches of each of these sites.
Collapse Button Related Ontology Subjects/Areas/Topics (10)
B2B, B2C and C2C

Enterprise Information Systems

Society, e-Business and e-Government

Communication and Software Technologies and Architectures

Social Information Systems

Software Agents and Internet Computing

e-Business

Social Networks and Organizational Culture

Web Information Systems and Technologies
e-Business and e-Commerce

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