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Displaying 1-29 out of 29 total
Towards a framework to support novice users in understanding and monitoring of Home Area Networks
Found in: Pervasive Computing and Communications Workshops, IEEE International Conference on
By Yuqian Song,Rob Brennan,David Lewis,Owen Conlan
Issue Date:March 2012
pp. 82-87
Advances in Home Area Network (HAN) technologies have afforded end users increased convenience in performing everyday activities. However, even seemingly trivial issues can cause great annoyance for the novice user who lacks domain expertise of often compl...
 
Service-Oriented Policy Management for Web-Application Frameworks
Found in: IEEE Internet Computing
By Kevin Feeney, David Lewis, Declan O'Sullivan
Issue Date:November 2009
pp. 39-47
Policy Based Management technologies represent a potentially important tool in the management of user services provided by web application frameworks. Current policy management systems are, however, a poor fit for the domain due to their lack of support fo...
 
Developing Autonomic Management Systems in Federated Environments
Found in: Engineering of Autonomic and Autonomous Systems, IEEE International Workshop on
By David Lewis, Kevin Feeney, Jose A. Lozano
Issue Date:April 2009
pp. 109-118
Autonomic Systems aim to reduce the costs of operating information and communication technology systems through employing knowledge-driven control loops to ensure that the systems operate within a defined behavioral envelope that conforms to business goals...
 
Making Ontologies Talk: Knowledge Interoperability in the Semantic Web
Found in: IEEE Intelligent Systems
By Monika Lanzenberger, Jennifer Sampson, Horst Kargl, Manuel Wimmer, Colm Conroy, Declan O'Sullivan, David Lewis, Rob Brennan, José Ángel Ramos-Gargantilla, Asunción Gómez-Pérez, Frédéric Fürst, Francky
Issue Date:November 2008
pp. 72-85
Ontologies offer shared vocabularies that are key to agent cooperation and knowledge systems integration as well as fundamental to the Semantic Web. As the number of ontologies increases, so does the need for new tools and techniques to establish agreement...
 
Towards the Visualisation of Collaborative Policy Decomposition
Found in: Policies for Distributed Systems and Networks, IEEE International Workshop on
By John Keeney, Owen Conlan, Declan O'Sullivan, David Lewis, Vincent Wade
Issue Date:June 2008
pp. 65-69
Policy-based management is typically used to manage large and complex systems, e.g. the management of telecommunications networks. When collaborating multi-disciplinary managers try to create policies from their own viewpoint they are hindered by a lack of...
 
Ontology Mapping Through Tagging
Found in: Complex, Intelligent and Software Intensive Systems, International Conference
By Colm Conroy, Declan O'Sullivan, David Lewis
Issue Date:March 2008
pp. 886-891
With ontologies increasing in number and becoming more common place, there is an ever increasing need for tools and techniques to cope with diversity and heterogeneity. We believe that the interfaces to ontology management tools will need to be engineered ...
 
The Role of Standardization in Future Autonomic Communication Systems
Found in: Engineering of Autonomic and Autonomous Systems, IEEE International Workshop on
By John Strassner, Joel Fleck, David Lewis, Manish Parashar, Willie Donnelly
Issue Date:April 2008
pp. 165-173
This paper examines the potential problems of interoperability in the development and widespread future deployment of autonomic communication systems. It draws on experiences from previous standardization efforts in the communications domain and outlines t...
 
Handling Dynamic Organizational Change with Community-Based Policy Management
Found in: Policies for Distributed Systems and Networks, IEEE International Workshop on
By Kevin Feeney, David Lewis, Vincent Wade
Issue Date:June 2007
pp. 56-60
Policy-based management (PBM) aims to provide flexibility in the management of resources so as to readily reflect changing business goals. However, as organizations increasingly use electronic means for more of their core business operations, the ability t...
 
Understanding as We Roam
Found in: IEEE Internet Computing
By Declan O'Sullivan, Vincent Wade, David Lewis
Issue Date:March 2007
pp. 26-33
Increasingly, the problem for roaming users isn't discovering local Web services or local context information or even getting their applications to interoperate with them at a syntactic level, but rather achieving interoperation at a semantic level. Develo...
 
Benchmarking Knowledge-based Context Delivery Systems
Found in: Autonomic and Autonomous Systems, International Conference on
By John Keeney, David Lewis, Declan O'Sullivan
Issue Date:July 2006
pp. 46
As context-aware systems become more widespread and mobile there is an increasing need for a common distributed event platform for gathering context information and delivering to context-aware applications. The likely heterogeneity across the body of conte...
 
Towards the Knowledge-Driven Benchmarking of Autonomic Communications
Found in: A World of Wireless, Mobile and Multimedia Networks, International Symposium on
By David Lewis, Declan O'Sullivan, John Keeney
Issue Date:June 2006
pp. 500-505
Currently a wide range of different adaptive and intelligent system solutions are being proposed for use in self-managing or autonomic networks. However, there are few means by which such proposals can be compared. This paper proposes that a benchmark be d...
 
Trust Meta-Policies for Flexible and Dynamic Policy Based Trust Management
Found in: Policies for Distributed Systems and Networks, IEEE International Workshop on
By Karl Quinn, David Lewis, Declan O'Sullivan, Vincent P. Wade
Issue Date:June 2006
pp. 145-148
It is possible to impose the will of the user or administrator through the specification of policies. These policies reflect the users or administrators goals; however the context in which these goals operate can vary greatly. This paper builds on our prev...
 
Relationship-Driven Policy Engineering for Autonomic Organisations
Found in: Policies for Distributed Systems and Networks, IEEE International Workshop on
By Kevin Feeney, Karl Quinn, David Lewis, Declan O'Sullivan, Vincent Wade
Issue Date:June 2005
pp. 89-98
Autonomic systems are needed to self-manage the increasing complexity of pervasive communications access and the ubiquitous computing services it offers to humans. Policy based governance is the means by which humans will impose their will upon how autonom...
 
The Stratix II logic and routing architecture
Found in: Proceedings of the 2005 ACM/SIGDA 13th international symposium on Field-programmable gate arrays (FPGA '05)
By Andy Lee, Boris Ratchev, Bruce Pedersen, Cameron McClintock, Chris Lane, David Cashman, David Galloway, David Lewis, Elias Ahmed, Giles Powell, Gregg Baeckler, Jay Schleicher, Jonathan Rose, Ketan Padalia, Kevin Stevens, Mark Bourgeault, Mike Hutton, Paul Leventis, Richard Cliff, Richard Yuan, Sandy Marquardt, Srinivas Reddy, Vaughn Betz
Issue Date:February 2005
pp. 14-20
This paper describes the Altera Stratix II™ logic and routing architecture. This architecture features a novel adaptive logic module (ALM) that is based on a 6-LUT, but can be partitioned into two smaller LUTs to efficiently implement circuits contai...
     
A comprehensive approach to modeling, characterizing and optimizing for metastability in FPGAs
Found in: Proceedings of the 18th annual ACM/SIGDA international symposium on Field programmable gate arrays (FPGA '10)
By David Lewis, David Neto, Deshanand Singh, Doris Chen, Jeffrey Chromczak, Ryan Fung, Vaughn Betz
Issue Date:February 2010
pp. 167-176
Metastability is a phenomenon that can cause system failures in digital circuits. It may occur whenever signals are being transmitted across asynchronous or unrelated clock domains. The impact of metastability is increasing as process geometries shrink and...
     
Architectural enhancements in Stratix-III™ and Stratix-IV™
Found in: Proceeding of the ACM/SIGDA international symposium on Field programmable gate arrays (FPGA '09)
By Andy Lee, Chris Lane, David Cashman, David Lewis, Elias Ahmed, Philip Pan, Tim Vanderhoek
Issue Date:February 2009
pp. 1-2
This paper describes architectural enhancements in the Stratix-III" and Stratix-IV" FPGA architectures. These architectures feature programmable power management, which allows the power and performance of logic and routing to be varied to minimize total po...
     
A Testbed for Evaluating Human Interaction with Ubiquitous Computing Environments
Found in: Testbeds and Research Infrastructures for the Development of Networks & Communities, International Conference on
By Eleanor O'Neill, Martin Klepal, David Lewis, Tony O'Donnell, Declan O'Sullivan, Dirk Pesch
Issue Date:February 2005
pp. 60-69
Core to ubiquitous computing environments are adaptive software systems that adapt their behavior to the context in which the user is attempting the task the system aims to support. This context is strongly linked with the physical environment in which the...
 
The stratixπ routing and logic architecture
Found in: Proceedings of the 2003 ACM/SIGDA eleventh international symposium on Field programmable gate arrays (FPGA '03)
By Andy Lee, Bruce Pedersen, Cameron McClintock, Chris Lane, Chris Wysocki, David Jefferson, David Lewis, Giles Powell, Jonathan Rose, Paul Leventis, Richard Cliff, Sandy Marquardt, Srinivas Reddy, Vaughn Betz
Issue Date:February 2003
pp. 12-20
This paper describes the Altera Stratix logic and routing architecture. The primary goals of the architecture were to achieve high performance and logic density. We give an overview of the entire device, and then focus on the logic and routing architecture...
     
Generating Highly-Routable Sparse Crossbars for PLDs
Found in: Field-Programmable Gate Arrays, International ACM Symposium on
By Guy Lemieux, Paul Leventis, David Lewis
Issue Date:February 2000
pp. 155-164
A method for evaluating and constructing sparse crossbars which are both area efficient and highly routable is presented. The evaluation method uses a network flow algorithm to accurately compute the percentage of random test vectors that can be routed. Th...
 
Efficient FPGAs using nanoelectromechanical relays
Found in: Proceedings of the 18th annual ACM/SIGDA international symposium on Field programmable gate arrays (FPGA '10)
By Chen Chen, David Lewis, H.-S. Philip Wong, J Provine, Jeff Watt, Kerem Akarvardar, Nishant Patil, Roger T. Howe, Roozbeh Parsa, Soogine Chong, Subhasish Mitra
Issue Date:February 2010
pp. 273-282
Nanoelectromechanical (NEM) relays are promising candidates for programmable routing in Field-Programmable-Gate Arrays (FPGAs). This is due to their zero leakage and potentially low on-resistance. Moreover, NEM relays can be fabricated using a low-temperat...
     
Application development using modeling and dynamical systems analysis
Found in: Proceedings of the 1st International Workshop on Context-Aware Middleware and Services: affiliated with the 4th International Conference on Communication System Software and Middleware (COMSWARE 2009) (CAMS '09)
By David Lewis, Eleanor O'Neill, Eoin Bailey, Kevin McCartney, Kris McGlinn, Simon Dobson
Issue Date:June 2009
pp. 1-1
Research on context aware systems is handicapped by the lack of readily available large scale data sets, as well as by the lack of tools by which researchers can interact effectively with such data sets across a range of scales and granularities. We show h...
     
Knowledge-based networking
Found in: Proceedings of the second international conference on Distributed event-based systems (DEBS '08)
By David Lewis, Declan O'Sullivan, Dominic Jones, John Keeney
Issue Date:July 2008
pp. 1-29
Content-based networks (CBN), such as [1--3], have formed around the necessity to match a varying subscriber base to that of a networks publication creators. This "de-coupling" of the parties involved in the communication process allows for message routing...
     
Extending Siena to support more expressive and flexible subscriptions
Found in: Proceedings of the second international conference on Distributed event-based systems (DEBS '08)
By David Lewis, Declan O'Sullivan, Dominic Jones, Dominik Roblek, John Keeney
Issue Date:July 2008
pp. 1-29
This paper defines and discusses the implementation of two novel extensions to the Siena Content-based Network (CBN) to extend it to become a Knowledge-based Network (KBN) thereby increasing the expressiveness and flexibility of its publications and subscr...
     
Knowledge-based semantic clustering
Found in: Proceedings of the 2008 ACM symposium on Applied computing (SAC '08)
By David Lewis, Declan O'Sullivan, Dominic Jones, Dominik Roblek, John Keeney
Issue Date:March 2008
pp. 28-34
Users of the web are increasingly interested in tracking the appearance of new postings rather than locating existing knowledge. Coupled with this is the emergence of the Web 2.0 movement (where everyone effectively publishes and subscribes), and the conce...
     
Circuit design of routing switches
Found in: Proceedings of the 2002 ACM/SIGDA tenth international symposium on Field-programmable gate arrays (FPGA '02)
By David Lewis, Guy Lemieux
Issue Date:February 2002
pp. 19-28
This paper examines circuit design of buffered routing switches in symmetrical, island-style FPGAs. The effects of switch size, tile length, level-restoring, and slow input slew rates are examined. Two new fanin-based switch designs are used to eliminate n...
     
Using sparse crossbars within LUT
Found in: Proceedings of the 2001 ACM/SIGDA ninth international symposium on Field programmable gate arrays (FPGA '01)
By David Lewis, Guy Lemieux
Issue Date:February 2001
pp. 59-68
In FPGAs, the internal connections in a cluster of lookup tables (LUTs) are often fully-connected like a full crossbar. Such a high degree of connectivity makes routing easier, but has significant area overhead. This paper explores the use of sparse crossb...
     
Generating highly-routable sparse crossbars for PLDs
Found in: Proceedings of the 2000 ACM/SIGDA eighth international symposium on Field programmable gate arrays (FPGA '00)
By David Lewis, Guy Lemieux, Paul Leventis
Issue Date:February 2000
pp. 155-164
A method for evaluating and constructing sparse crossbars which are both area efficient and highly routable is presented. The evaluation method uses a network flow algorithm to accurately compute the percentage of random test vectors that can be routed. Th...
     
Library/computing center mergers: the shape of the future, or an evil fad?
Found in: Proceedings of the 26th annual ACM SIGUCCS conference on User services (SIGUCCS '98)
By Bernard Hecker, Carolyn Walters, David Lewis, John Bucher, John Supra, Tim Foley
Issue Date:October 1998
pp. 3
Three years ago, the University of Maryland Computer Science Center sought a suitable pool of trainers to meet the computer training needs of the student population. Since full-time professional staff were already over-committed to other training and consu...
     
Characteristics And Problems Encountered In Different Database Applications (Panel Discussion)
Found in: Proceedings of the 1978 annual conference (ACM 78)
By A. O. Smith, Bharat Bhargava, David Lewis, Don P. Moehrke, John Lyon
Issue Date:December 1978
pp. 286
The work in presently available database management system was strongly influenced by business data processing. The future systems need to represent solutions to many of the problems that are encountered in databases employed in many applications such as m...
     
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