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International Workshop on Database and Expert Systems Applications

作者： Paulo Maio Nuno Silva Jose Cardoso School of Engineering Polytechnic of Porto GECAD-Knowledge Engineering and Decision Support Research Center Porto Portugal University of Trás-os-Montes and Alto Douro Vila Real Portugal

Agents embedded in open, dynamic and decentralized environments adopt different ontologies to describe their domain of discourse. Yet, agents have no prior knowledge of the other agents with whom they will interact. Therefore, a consistent and compatible communication relies on the agents' ability to reconcile in run-time the vocabulary used in their ontologies whose result is a set of correspondences. Since each party might have its own perspective about what are the best correspondences, conflicts arise. To address such conflicts, it is envisaged as a suitable approach that agents adopt the generic argument-based negotiation process presented in [1]. A critical issue of that process concerns the argument generation process according to the argumentation framework that it relies on. In this paper we propose an automatic process to generate arguments regarding the ontologies reconciliation through semantic interpretations of third party generated correspondences.

关键词： Ontologies Cognition Classification algorithms Conferences Semantics Semantic Web Educational institutions

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Fiducials marks detection to assist visually impaired people navigation

International Journal of Digital Content Technology and its ...

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International Journal of Digital Content Technology and its Applications 2011年第5期5卷 342-350页

作者： Costa, Paulo Fernandes, Hugo Vasconcelos, Verónica Coelho, Paulo Barroso, João Hadjileontiadis, Leontios Polytechnic Institute of Leiria Portugal University of Trás-os-Montes e Alto Douro Portugal Polytechnic Institute of Coimbra Portugal GECAD - Knowledge Engineering and Decision Support Research Center Porto Portugal Department of Electrical and Computer Engineering Aristotle University of Thessaloniki Greece

Assistive technology enables people to achieve independence in the accomplishment of their daily tasks and enhance their quality of life. Visual information is the basis for most navigational tasks, so visually impaired individuals are at disadvantage due to the lack of information or given unsufficient information about their surrounding environment. With the recent advances in inclusive technology it is possible to extend the support given to people with visual disabilities during their mobility. In this context we propose and describe the SmartVision project, whose global objective is to assist visually impaired people in their navigation through unknown indoor and outdoor environments. This paper is focused mainly on the Computer Vision module of the SmartVision prototype, were we propose a new algorithm to recognise fiducials marks suitably placed on sidewalks, revealing to be a promising solution.

关键词： Empirical mode decomposition

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Recommending access to web resources based on user's profile and traceability

Recommending access to web resources based on user's profile...

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10th IEEE International Conference on Computer and Information Technology, CIT-2010, 7th IEEE International Conference on Embedded Software and Systems, ICESS-2010, 10th IEEE Int. Conf. Scalable Computing and Communications, ScalCom-2010

作者： Bettencourt, Nuno Silva, Nuno GECAD - Knowledge Engineering and Decision Support Research Center Polytechnic of Porto Porto Portugal

ISBN: (纸本)9780769541082

Toward a constant demand for sharing and managing available resources on the Internet, users need better tools and applications for providing resource authorization as well as tools for recommendation about resource sharing. Access control permissions should be independent of resource physical locations and types available on different web servers. This paper presents a novel approach for access control and recommendation by exploiting users FOAF Profiles, resource metadata and traceability information, seemingly captured during the resources' publication process. © 2010 IEEE.

关键词： Authorization

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Emergency energy resource management in smartgrids

Emergency energy resource management in smartgrids

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International Conference on Critical Infrastructure

作者： Vale, Z. Morais, H. Faria, P. Ferreira, J. GECAD - Knowledge Engineering and Decision-Support Research Center Institute of Engineering Polytechnic of Porto Rua Dr. António Bernardino de Almeida 431 4200-072 Porto Portugal

ISBN: (纸本)9781424480814

Energy resources management can play a very relevant role in future power systems in a SmartGrid context, with intensive penetration of distributed generation and storage systems. This paper deals with the importance of resource management in incident situations. The paper presents DemSi, an energy resources management simulator that has been developed by the authors to simulate electrical distribution networks with high distributed generation penetration, storage in network points and customers with demand response contracts. DemSi is used to undertake simulations for an incident scenario, evidencing the advantages of adequately using flexible contracts, storage, and reserve in order to limit incident consequences. © 2010 IEEE.

关键词： Distributed power generation

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Ancillary Services Dispatch using Linear Programming and Genetic Algorithm approaches

Ancillary Services Dispatch using Linear Programming and Gen...

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IEEE Mediterranean Electrotechnical Conference

作者： Zita A. Vale Carlos Ramos Pedro Faria Joao P. Soares Bruno Canizes H. M. Khodr GECAD - Knowledge Engineering and Decision-Support Research Center Institute of Engineering - Polytechnic of Porto (ISEP/IPP) GECAD - Knowledge Engineering and Decision-Support Research Center Institute of Engineering - Polytechnic of Porto(ISEP/IPP)

ISBN: (纸本)9781424457939

Electricity market players operating in a liberalized environment requires access to an adequate decision support tool, allowing them to consider all the business opportunities and take strategic decisions. Ancillary services represent a good negotiation opportunity that must be considered by market players. For this, decision support tools must include ancillary market simulation. This paper proposes two different methods (Linear Programming and Genetic Algorithm approaches) for ancillary services dispatch. The methodologies are implemented in MASCEM, a multi-agent based electricity market simulator. A test case concerning the dispatch of Regulation Down, Regulation Up, Spinning Reserve and Non-Spinning Reserve services is included in this paper.

关键词： Ancillary services Regulation (biology) Standing Orders CASING INSPECTION Genetic Algorithm (GA) decision support tool linear programming Dispatching

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ANN based Day-Ahead Ancillary Services Forecast for Electricity Market Simulation

ANN based Day-Ahead Ancillary Services Forecast for Electric...

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IEEE Mediterranean Electrotechnical Conference

作者： Pedro Faria Zita Vale Joao Soares Hussein Khodr Bruno Canizes Knowledge Engineering and Decision Support Research Center (GECAD) Institute of Engineering - Polytechnic of Porto (ISEP/IPP) Knowledge Engineering and Decision Support Research Center (GECAD) Institute of Engineering - Polytechnic of Porto(ISEP/IPP)

ISBN: (纸本)9781424457939

Adequate decision support tools are required by electricity market players operating in a liberalized environment, allowing them to consider all the business opportunities and take strategic decisions. Ancillary services (AS) represent a good negotiation opportunity that must be considered by market players. Based on the ancillary services forecasting, market participants can use strategic bidding for day-ahead ancillary services markets. For this reason, ancillary services market simulation is being included in MASCEM, a multi-agent based electricity market simulator that can be used by market players to test and enhance their bidding strategies. The paper presents the methodology used to undertake ancillary services forecasting, based on an Artificial Neural Network (ANN) approach. ANNs are used to day-ahead prediction of non-spinning reserve (NS), regulation-up (RU), and regulation down (RD). Spinning reserve (SR) is mentioned as past work for comparative analysis. A case study based on California ISO (CAISO) data is included;the forecasted results are presented and compared with CAISO published forecast.

关键词： Ancillary services Artificial neural networks power markets decision support tool Players simulating

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Recommending Access to Web Resources based on User's Profile and Traceability

Recommending Access to Web Resources based on User's Profile...

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International Conference on Computer and Information Technology (CIT)

作者： Nuno Bettencourt Nuno Silva GECAD-Knowledge Engineering and Decision Support Research Center Polytechnic of Porto Porto Portugal

关键词： Authentication Social network services Authorization Context Web server

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Demsi — A demand response simulator in the context of intensive use of distributed generation

Demsi — A demand response simulator in the context of inten...

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IEEE International Conference on Systems, Man and Cybernetics

作者： Pedro Faria Zita A. Vale Judite Ferreira GECAD-Knowledge Engineering and Decision Support Research Center Institute of Engineering Polytechnic of Porto Porto Portugal

Demand response can play a very relevant role in future power systems in which distributed generation can help to assure service continuity in some fault situations. This paper deals with the demand response concept and discusses its use in the context of competitive electricity markets and intensive use of distributed generation. The paper presents DemSi, a demand response simulator that allows studying demand response actions and schemes using a realistic network simulation based on PSCAD. Demand response opportunities are used in an optimized way considering flexible contracts between consumers and suppliers. A case study evidences the advantages of using flexible contracts and optimizing the available generation when there is a lack of supply.

关键词： Computer languages PSCAD Flexible printed circuits Contracts Aggregates Load modeling

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Ancillary services market clearing simulation: A comparison between deterministic and heuristic methods

Ancillary services market clearing simulation: A comparison ...

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IEEE General Meeting Power& Energy Society

作者： Zita A. Vale Carlos Ramos Pedro Faria João P. Soares Bruno Canizes H.M. Khodr GECAD-Knowledge Engineering and Decision-Support Research Center of the Institute of Engineering Polytechnic of Porto Porto Portugal

Electricity market players operating in a liberalized environment requires access to an adequate decision support tool, allowing them to consider all the business opportunities and take strategic decisions. Ancillary services represent a good negotiation opportunity that must be considered by market players. For this, decision support tools must include ancillary market simulation. This paper proposes two different methods (Linear Programming and Genetic Algorithm approaches) for ancillary services dispatch. The methodologies are implemented in MASCEM, a multi-agent based electricity market simulator. A test case based on California Independent System Operator (CAISO) data concerning the dispatch of Regulation Down, Regulation Up, Spinning Reserve and Non-Spinning Reserve services is included in this paper.

关键词： Electricity supply industry Biological system modeling Optimization Real time systems Production Strontium Frequency control

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Comparison between deterministic and meta-heuristic methods applied to ancillary services dispatch 10

Comparison between deterministic and meta-heuristic methods ...

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Proceedings of the 23rd international conference on Industrial engineering and other applications of applied intelligent systems - Volume Part I

作者： Zita A. Vale Carlos Ramos Pedro Faria João P. Soares Bruno Canizes Joaquim Teixeira Hussein M. Khodr GECAD Knowledge Engineering and Decision Support Research Center Institute of Engineering Polytechnic of Porto Porto Portugal

ISBN: (纸本)9783642130212

This paper proposes two meta-heuristics (Genetic Algorithm and Evolutionary Particle Swarm Optimization) for solving a 15 bid-based case of Ancillary Services Dispatch in an Electricity Market. A Linear Programming approach is also included for comparison purposes. A test case based on the dispatch of Regulation Down, Regulation Up, Spinning Reserve and Non-Spinning Reserve services is used to demonstrate that the use of meta-heuristics is suitable for solving this kind of optimization problem. Faster execution times and lower computational resources requirements are the most relevant advantages of the used meta-heuristics when compared with the Linear Programming approach.

关键词： electricity markets evolutionary particle swarm optimization artificial intelligence techniques linear programming genetic algorithm ancillary services dispatch

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