http://irserver.ucd.ie/dspace The DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material. Search the Channel search http://irserver.ucd.ie/dspace/simple-search http://hdl.handle.net/10197/3509 Author: <a reL="tag">Garcia Esparza, Sandra</a>; <a reL="tag">O'Mahony, Michael P.</a>; <a reL="tag">Smyth, Barry</a> <br/> <br/>Abstract: The Social Web provides new and exciting sources of information that may be used by recommender systems as a complementary source of recommendation knowledge. For example, User-Generated Content, such as reviews, tags, comments, tweets etc. can provide a useful source of item information and user preference data, if a clear signal can be extracted from the inevitable noise that exists within these sources. In previous work we explored this idea, mining term-based recommendation knowledge from user reviews, to develop a recommender that compares favourably to conventional collaborative-filtering style techniques across a range of product types. However, this previous work focused solely on recommendation accuracy and it is now well accepted in the literature that accuracy alone tells just part of the recommendation story. For example, for many, the promise of recommender systems lies in their ability to surprise with novel recommendations for less popular items that users might otherwise miss. This makes for a riskier recommendation prospect, of course, but it could greatly enhance the practical value of recommender systems to end-users. In this paper we analyse our User-Generated Content (UGC) approach to recommendation using metrics such as novelty, diversity, and coverage and demonstrate superior performance, when compared to conventional user-based and item- based collaborative filtering techniques, while highlighting a number of interesting performance trade-offs. <br/> <br/>Conference details: Presented at the 3rd Workshop on Recommender Systems and the Social Web (RSWEB-11), 5th ACM Conference on Recommender Systems, Chicago, IL, USA, 23-27 October 2011 Sun, 23 Oct 2011 00:00:00 GMT http://hdl.handle.net/10197/3508 Author: <a reL="tag">Bourke, Steven</a>; <a reL="tag">McCarthy, Kevin</a>; <a reL="tag">Smyth, Barry</a> <br/> <br/>Abstract: The explosive growth of online social networks in recent times has presented a powerful source of information to be utilised in personalised recommendations. Unsurprisingly there has already been a large body of work completed in the recommender system field to incorporate this social in- formation into the recommendation process. In this paper we examine the practice of leveraging a user’s social graph in order to generate recommendations. Using various neighbourhood selection strategies, we examine the user satisfaction and the level of perceived trust in the recommendations received. <br/> <br/>Conference details: Paper presented at RecSys-11, Chicago IL, USA, October 23-27, 2011 Thu, 01 Sep 2011 00:00:00 GMT http://hdl.handle.net/10197/3507 Author: <a reL="tag">McNally, Kevin</a>; <a reL="tag">O'Mahony, Michael P.</a>; <a reL="tag">Smyth, Barry</a> <br/> <br/>Abstract: To date web search has been a solitary experience for the end-user, despite the fact that recent studies highlight the potential for collaboration that is inherent in many search tasks and scenarios. As a result, researchers have begun to explore the potential for a more collaborative approach to web search, one in which the search actions of other users can influence the results returned. In this context, the expertise of other users plays an important role when it comes to ensuring the quality of recommendations that arise from their actions. The reputation of these users is important in collaborative and social search tasks, much as relevance is vital in conventional web search. In this paper we examine this concept of reputation in collaborative and social search contexts. We describe a number of different reputation models and evaluate them in the context of a particular social search service. Our results highlight the potential for reputation to improve the quality of recommendations that arise from the activities of other searchers. <br/> <br/>Conference details: Paper presented at the Third IEEE International Conference on Social Computing (SocialCom2011), MIT, Boston, USA, 9-11 October 2011 Sun, 09 Oct 2011 00:00:00 GMT http://hdl.handle.net/10197/3506 Author: <a reL="tag">O'Grady, Michael J.</a>; <a reL="tag">O'Hare, G. M. P. (Greg M. P.)</a>; <a reL="tag">O'Donoghue, John</a> <br/> <br/>Abstract: The conference series on Pervasive Computing Technologies for Healthcare is one of the leading fora for research dissemination in this space. In May 2011, the most recent event took place in Ireland. A brief overview of the conference is now presented. Thu, 01 Sep 2011 00:00:00 GMT http://hdl.handle.net/10197/3505 Author: <a reL="tag">Ruzzelli, Antonio G.</a>; <a reL="tag">Nicolas, C.</a>; <a reL="tag">Schoofs, Anthony</a>; <a reL="tag">O'Hare, G. M. P. (Greg M. P.)</a> <br/> <br/>Abstract: Sensing, monitoring and actuating systems are expected to play a key role in reducing buildings overall energy consumption. Leveraging sensor systems to support energy efficiency in buildings poses novel research challenges in monitoring space usage, controlling devices, interfacing with smart energy meters and communicating with the energy grid. In the attempt of reducing electricity consumption in buildings, identifying individual sources of energy consumption is key to generate energy awareness and improve efficiency of available energy resources usage. Previous work studied several non-intrusive load monitoring techniques to classify appliances; however, the literature lacks of an comprehensive system that can be easily installed in existing buildings to empower users profiling, benchmarking and recognizing loads in real-time. This has been a major reason holding back the practice adoption of load monitoring techniques. In this paper we present RECAP: RECognition of electrical Appliances and Profiling in real-time. RECAP uses a single wireless energy monitoring sensor easily clipped to the main electrical unit. The energy monitoring unit transmits energy data wirelessly to a local machine for data processing and storage. The RECAP system consists of three parts: (1) Guiding the user for profiling electrical appliances within premises and generating a database of unique appliance signatures; (2) Using those signatures to train an artificial neural network that is then employed to recognize appliance activities (3) Providing a Load descriptor to allow peer appliance benchmarking. RECAP addresses the need of an integrated and intuitive tool to empower building owners with energy awareness. Enabling real-time appliance recognition is a stepping-stone towards reducing energy consumption and allowing a number of major applications including load-shifting techniques, energy expenditure breakdown per appliance, detection of power hungry and faulty appliances, and recognition of occupant activity. This paper describes the system design and performance evaluation in domestic environment. <br/> <br/>Conference details: Paper presented at Sensor Mesh and Ad Hoc Communications and Networks (SECON), 2010 7th Annual IEEE Communications Society Conference, Boston, Massachusetts, 21-25 June, 2010 Tue, 01 Jun 2010 00:00:00 GMT http://hdl.handle.net/10197/3504 Author: <a reL="tag">Daly, Aoife</a> <br/> <br/>Abstract: Dendrochronological dating and timber provenance of a boat found at Knudedyb, Ribe Harbour, Denmark. Result: summer 1264. Tue, 01 Aug 2006 00:00:00 GMT http://hdl.handle.net/10197/3503 Author: <a reL="tag">Daly, Aoife</a> <br/> <br/>Abstract: Dendrochronological dating and timber provenance of a boat found at Spodsbjerg Drej, Svendborg amt, Denmark. Result: after AD 1775. Sun, 01 Aug 2004 00:00:00 GMT http://hdl.handle.net/10197/3502 Author: <a reL="tag">Daly, Aoife</a> <br/> <br/>Abstract: Dendrochronological dating and timber provenance of two boats found at Larvik, Norway. Result: Boat 5 c. 1700, Boat 6 spring/summer 1728. Sat, 01 Dec 2007 01:00:00 GMT http://hdl.handle.net/10197/3498 Author: <a reL="tag">Blokhina, Elena</a>; <a reL="tag">Feely, Orla</a>; <a reL="tag">Dominguez, Manuel</a> <br/> <br/>Abstract: In this paper we apply methods of nonlinear dynamics to examine the behavior of the pulsed digital oscillator for microelectromechanical systems (MEMS). We study the regions of existence of oscillations and demonstrate the effect on these of including additional delays into the feedback loop. <br/> <br/>Conference details: Paper presented at the IEEE International Symposium on Circuits and Systems 2009 (ISCAS 2009), May 24 -27, 2009, Taipei, Taiwan Fri, 01 May 2009 00:00:00 GMT http://hdl.handle.net/10197/3497 Author: <a reL="tag">Blokhina, Elena</a>; <a reL="tag">Feely, Orla</a>; <a reL="tag">Dominguez, Manuel</a> <br/> <br/>Abstract: The aim of this paper is to apply an approach that will allow us to consider different mechanical modes of a MEMS cantilever in the form of separate mass-spring-damper equations with the appropriate form of an external driving. In the paper, we focus on a specific MEMS cantilever and use a Pulsed Digital Oscillator (PDO) to keep self-sustained oscillations of the mechanical structure. By applying the order-reduction procedure to a partial differential equation that describes the transversal deflections, we obtain a system of coupled ordinary differential equations that describes the excitation of multiple spatial modes. On the basis of these ordinary differential equations, we formulate a set of iterative maps to describe the evolution of the modes between two sampling events. The numerical simulations we present are focused on the most common case when the first two mechanical modes are taken into consideration <br/> <br/>Conference details: Paper presented at the European Conference on Circuit Theory and Design 2009 (ECCTD 2009), Antalya, Turkey, 23-27 August 2009 Sat, 01 Aug 2009 00:00:00 GMT http://hdl.handle.net/10197/3496 Author: <a reL="tag">Blokhina, Elena</a>; <a reL="tag">Feely, Orla</a>; <a reL="tag">Ricart, Jordi</a>; <a reL="tag">Dominguez, Manuel</a> <br/> <br/>Abstract: In this paper, we study the possible output of the pulsed digital oscillator (PDO) with multiple resonant modes of the mechanical resonator in the feedback loop. PDOs are simple circuits that allow linear resonators to maintain self-sustained oscillations and can work as mass-change resonant sensors. For a resonant sensor, activation of higher vibration modes of a mechanical resonator can be a way to improve its performance. We show that the location of the sensing/actuation system affects the output and can enhance higher mechanical modes. <br/> <br/>Conference details: Paper presented at the IEEE International Symposium on Circuits and Systems 2010 (ISCAS 2010), Paris, France, 30 May - 2 June, 2010. Sat, 01 May 2010 00:00:00 GMT http://hdl.handle.net/10197/3495 Author: <a reL="tag">English, Niall J.</a>; <a reL="tag">Gorman, Paul D.</a>; <a reL="tag">MacElroy, J. M. Don</a> <br/> <br/>Abstract: Extensive equilibrium molecular dynamics (MD) simulations have been performed to investigate thermal conduction mechanisms via the Green-Kubo approach for (type II) hydrogen hydrate, at 0.05 kbar and between 30 and 250 K, for both lightly-filled H2 hydrates (1s4l) and for more densely-filled H2 systems (2s4l), in which four H2 molecules are present in the large cavities, with respective single- and double-occupation of the small cages. The TIP4P water model was used in conjunction with a fully atomistic hydrogen potential along with long-range Ewald electrostatics. It was found that substantially less damping in guest-host energy transfer is present in hydrogen hydrate as is observed in common type I clathrates (e.g., methane hydrate), but more akin in to previous results for type II and H methane hydrate polymorphs. This gives rise to larger thermal conductivities relative to common type I hydrates, and also larger than type II and H methane hydrate polymorphs, and a more crystal-like temperature dependence of the thermal conductivity. Mon, 23 Jan 2012 01:00:00 GMT http://hdl.handle.net/10197/3492 Author: <a reL="tag">Daly, Aoife</a> <br/> <br/>Abstract: Dendrochronological dating and timber provenance of a boat found at Bestumkilen, Norway. Result c. 1890 Wed, 01 Oct 2008 00:00:00 GMT http://hdl.handle.net/10197/3491 Author: <a reL="tag">Daly, Aoife</a> <br/> <br/>Abstract: Dendrochronological dating and timber provenance of a ship found at Mollö, Sverige. Result c. 1365 Thu, 01 May 2008 00:00:00 GMT http://hdl.handle.net/10197/3490 Author: <a reL="tag">Daly, Aoife</a> <br/> <br/>Abstract: Dendrochronological dating and timber provenance of a ship found at Juvre Sand, Denmark. Result after c. 1770 Sat, 01 Mar 2008 01:00:00 GMT http://hdl.handle.net/10197/3489 Author: <a reL="tag">Daly, Aoife</a> <br/> <br/>Abstract: Dendrochronological dating and timber provenance of a ship found at Melby Overdrev, Zealand, Denmark. Result c. 1765 Sun, 01 Jun 2008 00:00:00 GMT http://hdl.handle.net/10197/3488 Author: <a reL="tag">Daly, Aoife</a> <br/> <br/>Abstract: Dendrochronological dating and timber provenance of a ship found at Strandmøllen, Denmark. Result after c. 1790 Tue, 01 Apr 2008 00:00:00 GMT http://hdl.handle.net/10197/3487 Author: <a reL="tag">Daly, Aoife</a> <br/> <br/>Abstract: Dendrochronological dating and timber provenance of a boat found at Gåsehage, Randers amt, Denmark. Result c. 1577 Sun, 21 Jun 2009 00:00:00 GMT http://hdl.handle.net/10197/3486 Author: <a reL="tag">Daly, Aoife</a> <br/> <br/>Abstract: Dendrochronological dating and timber provenance of a boat found at Bovet Læsø, Denmark. Result c. 1381 Sat, 25 Apr 2009 00:00:00 GMT http://hdl.handle.net/10197/3485 Author: <a reL="tag">Daly, Aoife</a> <br/> <br/>Abstract: Dendrochronological dating and timber provenance of a boat found at Gedserbrogård, Falster, Denmark. Result c. 1490 Mon, 15 Jun 2009 00:00:00 GMT