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Publicações

2006

Petri net based methodology for the development of collaborative production systems

Autores
Leitao, P; Colombo, AW;

Publicação
2006 IEEE CONFERENCE ON EMERGING TECHNOLOGIES & FACTORY AUTOMATION, VOLS 1 -3

Abstract
This paper proposes a methodology for the development of collaborative (agent-based) production systems, using High-Level Petri nets. The proposed methodology supports the development life-cycle from specifications analysis through to design-validation and implementation of collaborative and re-configurable production systems and their control systems, in an integrated manner. It covers a wide spectrum of application domains, ranging from intelligent mechatronic devices to multi-agent distributed manufacturing control systems.

2006

Quantum dots as self-referenced optical fibre temperature probes for luminescent chemical sensors

Autores
Jorge, PAS; Mayeh, M; Benrashid, R; Caldas, P; Santos, JL; Farahi, F;

Publicação
MEASUREMENT SCIENCE & TECHNOLOGY

Abstract
The use of semiconductor nano-particles as temperature probes in luminescence chemical sensing applications is addressed. Temperature changes the intensity, the peak wavelength and the spectral width of the quantum dots luminescent emission in a linear and reversible way. Results are presented that show the feasibility of implementing a self-referenced intensity-based sensor to perform temperature measurements independent of the optical power level in the sensing system. A resolution of 0.3 degrees C was achieved. In addition, it is demonstrated that self-referenced temperature measurements at multiple points could be performed using reflection or transmission based optical fibre configurations.

2006

1ª Conferência em Metodologias de Investigação Científica (CoMIC'06) : Actas

Autores
Oliveira, E; Sousa, AAd;

Publicação

Abstract

2006

Instant management infrastructure: Through network management support systems and software agents coordination

Autores
Folha, JA; Marques, BF; Oliveira, JA; Coelho, PM; Oliveira, RF;

Publicação
ICE-B 2006 - International Conference on e-Business, Proceedings

Abstract
Enterprises need to automate manual and routine aspects of IT infrastructure management. In this paper a new concept that integrates different autonomous and management level applications through Instant Messaging protocol (XMPP) is introduced. This is achieved by means of a common management information model implemented in LDAP. A content language implemented in XML is also described, allowing autonomous application integration to carry out management tasks dynamically.

2006

Secure cryptographic workflow in the standard model

Autores
Barbosa, M; Farshim, P;

Publicação
Progress in Cryptology - INDOCRYPT 2006, Proceedings

Abstract
Following the work of Al-Riyami et al. we define the notion of key encapsulation mechanism supporting cryptographic workflow (WF-KEM) and prove a KEM-DEM composition theorem which extends the notion of hybrid encryption to cryptographic workflow. We then generically construct a WF-KEM from an identity-based encryption (IBE) scheme and a secret sharing scheme. Chosen ciphertext security is achieved using one-time signatures. Adding a public-key encryption scheme we are able to modify the construction to obtain escrow-freeness. We prove all our constructions secure in the standard model.

2006

Experimental evaluation of new one-chip solution for induction motor drives

Autores
Araujo, RE; Moutinho, J; Leite, V;

Publicação
2006 IEEE International Symposium on Industrial Electronics, Vols 1-7

Abstract
The design of high performance induction motor drives is a complex task, and the every day compelling requirements in energy efficiency and performance assumes the motivation on finding a more integrated solution on implementing induction motor control. The main subjects of this paper are two: to discuss the IFOC one-chip solution and to explore the development of simple graphical applications in order to operate this control in a simple and effective way. Experimental results are presented to illustrate the main points of our paper.

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