Publications:

H. Gamboa and A. Fred (2004). A Behavioral Biometric System Based on Human Computer Interaction. In Proc. of Proceedings of SPIE, Vol. #5404-36, 2004.

A. Fred and J. Leitão. A new cluster isolation criterion based on dissimilarity increments. IEEE Trans. on Pattern Analysis and Machine Intelligence, 25(8), 2003.

A. Fred and A. K. Jain. Robust data clustering. In Proc. of IEEE Computer Society Conference on Computer Vision and Pattern Recognition, CVPR 2003, Madison - Wisconsin, USA, June 2003.

H. Gamboa and A. Fred. An identity authentication system based on human computer interaction behaviour. In Jean-Marc Ogier and Eric Trupin, editors, Pattern Recognition in Information Systems – Proc. of the 3rd Intl. Workshop on Pattern Recognition in Information Systems, pages 46 –55. ICEIS PRESS, 2003.

H. Gamboa and A. Fred. A user authentication technique using a web interaction monitoring system. In Proc. of 1st Iberian Conference on Pattern Recognition and Image Analysis, IBPRIA 2003, Mallorca, Spain, June 2003.

A. Fred. Similarity measures and clustering of string patterns. In Dechang Chen and Xiuzhen Cheng, editors, Pattern Recognition and String Matching, Kluwer Academic, 2002.

A. Fred and A. K. Jain. Data clustering using evidence accumulation. In Proc. of the 16th Int’l Conference on Pattern Recognition, ICPR 2002, pages 276 – 280, 2002.

A. Fred. Clustering based on dissimilarity first derivatives. In J. Iñesta and L. Micó, editors, Pattern Recognition in Information Systems – Proc. of the 2nd Intl. Workshop on Pattern Recognition in Information Systems, pages 257 –266. ICEIS PRESS, 2002.

A. Fred and A. K.Jain. Evidence accumulation clustering based on the k-means algorithm. In T.Caelli et al., editor, Structural, Syntactic, and Statistical Pattern Recognition, volume LNCS 2396, pages 442 –451. Springer-Verlag, 2002.

H. Gamboa and A. Fred. Designing intelligent tutoring systems: a bayesian approach. In B.Sharp J.Filipe and P.Miranda, editors, Enterprise Information Systems III, pages 146 –152. Kluwer Academic Publishers, 2002.

A. Fred. Context-dependent clustering based on dissimilarity increments. In Proc. of the Portuguese Conf. on Pattern Recognition - RecPad 2002, Aveiro, June 2002.

A. Fred and A. K. Jain. Guest editors of the special edition: Pattern recognition in information systems. Pattern Recognition, vol 35, No.12, 2002.

A. Fred and A. K. Jain. Pattern Recognition in Information Systems. ICEIS Press, 2001.

A. Fred. Finding consistent clusters in data partitions. In Josef Kittler and Fabio Roli, editors, Multiple Classifier Systems, volume LNCS 2096, pages 309 –318. Springer, 2001.

A. Fred and J. Filipe. Syntax-directed translation schemes for multi-agent systems conversation modelling. In J.Filipe, B.Sharp and J.Cordeiro, editors, Enterprise Information Systems II, pages 94 –100. Kluwer Academic Publishers, 2001.

I. Milho and A. Fred. A user-friendly development tool for medical diagnosis based on Bayesian networks. In J.Filipe B.Sharp and J.Cordeiro, editors, Enterprise Information Systems II, pages 113 –120. Kluwer Academic Publishers, 2001.

A. Fred, J. Filipe, M. Partinen, and T. Paiva. Psg-expert: An expert system for the diagnosis of sleep disorders. In T.Paiva and T.Penzel, editors, European Neurological Network,  number 78 in Studies in Health Technology and Informatics, chapter 3.3, pages 127 –147. IOS Press, 2000.

A. Fred and J. Leitão. Clustering under a hypothesis of smooth dissimilarity increments. In , ICPR 2000, volume 2, pages 190 –194, Barcelona, 2000.

A. Fred and J. Leitão. Partitional vs hierarchical clustering using a minimum grammar complexity approach. In Joint Intl. Workshops on Statistical, Syntactical and Structural Pattern Recognition,   2000.

I. Milho and A. Fred. An auxiliary system for medical diagnosis based on Bayesian belief networks. In Proc. of the 11th Portuguese Conference on Pattern Recognition, RECPAD’2000, pages 271 –276, Porto, 2000.

I. Milho and A. Fred. A user-friendly development tool for medical diagnosis based on Bayesian networks. In Proc. of the 2nd Int’l Conference on Enterprise Information Systems, ICEIS’2000, pages 176 –180, 2000.

A. Fred and J. Filipe. Syntax-directed translation schemes for multi-agent conversation modelling. In Proc. of the 2nd Int’l Conference on Enterprise Information Systems, ICEIS’2000,  pages 132 –138, 2000.

A. Fred. Computation of substring probabilities in stochastic grammars. In Arlindo Oliveira, editor, Grammatical Inference: Algorithms and Applications, volume 1891 of LNAI, pages 103 - 114. Springer, 2000.

A. Fred and J. Filipe. GMED - a case-study of a specialized graphical medical diagnosis shell application. In Proc. of the International Conference on Artificial Intelligence and Soft Computing, AISC 99, 1999.

J. Filipe, A. Fred, and M. Fernandes. GDOS - a graphical diagnosis-oriented expert system development tool. In Proc. of the 1st Int’l Conference on Enterprise Information Systems, ICEIS’99, pages 211 –218, 1999.

A. Fred and J. Leitão. A comparative study of string dissimilarity measures in structural clustering. In Sameer Singh, editor, Int’l Conference on Advances in Pattern Recognition, pages 385 –394. Springer, 1998.

A. Fred and J. Leitão. Minimal Sample Size for Grammatical Inference - a Bootstrapping Approach. In 2nd International Workshop on Statistical Techniques in Pattern Recognition, Springer-Verlag, pp 920-928,1998.

A. Fred, T. Paiva, J. Leitão, and A. Rosa. Sleep EEG patterns and the prediction of REM. In Proc. of the 14th Congress of the European Sleep Research Society, 1998.

A. Fred and J.Leitão. From EEG microstructure to sleep macrostructure: a unified approach. In Proc. of the 10th Portuguese Conference on Pattern Recognition, RecPad 98, pages 179 –186, 1998.

A. Fred, J .S. Marques, and P. M. Jorge. Hidden Markov models vs syntactic modeling in object recognition. In Int’l Conference on Image Processing, ICIP’97, pages 893 –896, Santa Barbara, October 1997.

V. Almeida, V. Ribeiro, and A. Fred. An error-correcting parser for context-free grammars. In Proc. of the 9th Portuguese Conference on Pattern Recognition, RecPad 97, pages 239 - 246, 1997.

A. Fred. Clustering of sequences using a minimum grammar complexity criterion. In  L. Miclet and C. Higuera, editors, Grammatical Inference: Learning Syntax from Sentences, pages 107 –116. Springer-Verlag, 1996.

A. Fred and J. Leitão. A minimum code length technique for clustering of syntactic patterns. In Proc. of the 13th IAPR Int’l Conference on Pattern Recognition,  pages 680 –684, Vienna,1996.

A. Fred and J. Leitão. Parsing in Attributed Grammars: Application to Automatic Sleep Analysis. In  IEEE Int’l Conference on Acoustics, Speech and Signal Processing, ICASSP 96, pp 3466 –3469, Atlanta, May,1996.

A. Fred and T .Paiva. Sleep Dynamics and Sleep Disorders: a Syntactic Approach to Hypnogram Classification. In 10th Nordic-Baltic Conference on Biomedical Engineering and 1st International Conference on Bioelectromagnetism, pp 395 –396, Tampere,Finland, June,1996.

T. Paiva, J. Telles and A. Fred. Automatic Classification of Data. In 13th European Sleep Congress, 1996.

N. Gracias, J. Lima, M. Figueiredo and A. Fred. Adaptive Contour Estimation with genetic Algorithms. In Proc. of the Int’l Conference on Systems, Man and Cybernetics, SMC 96, pp 2265 –2269, China, 1996.

A. Fred. Heuristic Syntax-Directed Translation. In Proc. of the Int’l Conference on Information Systems Analysis and Synthesis, pp 301 –306,1996.

J. Filipe, A. Fred, T. Paiva and M. Partinen. A Second Generation Expert System for the Diagnosis of Sleep Disorders using Polysomnographic Data. In Proc. of the Int’l Conference on Information Systems Analysis and Synthesis, pp 296 –300,1996.

A. Fred and J. Leitão. A Minimum Code Length Technique for Clustering of Syntactic Patterns. In Proc. of the 13th IAPR Int’l Conference on Pattern Recognition, pp 680 –684,  1996.

A. Fred and J. Leitão. A Context-Free Parsing Algorithm using Heuristic Search. In Proc. of the Int’l Conference on Systems, Man and Cybernetics, SMC 95, pp 4224 –4229, 1995.

A. Fred and J. Leitão. Attributed Grammars in Hypnogram Analysis. In Proc. of the Int’l Conference on Systems, Man and Cybernetics, SMC 95, pp 4230  4235, 1995.

A. Fred, A. C. Rosa, and J. Leitão, Predicting REM in Sleep EEG using a Structural Approach, Pattern Recognition in Practice, E.S.Gelsema et.al.(Eds), Elsevier Science Publishers, pp 107 –117,1994.

A. Fred and J. Leitão. Solomonoff coding as a means of introducing prior information in syntactic pattern recognition. In Proc. of the 12th IAPR Int’l Conference on Pattern Recognition, pages 14 –18, 1994.

A. Fred and J. Leitão. Improving Sentence Recognition in Stochastic Context-Free Grammars. In Proc. of the Int’l Conference on Acoustics, Speech and Signal Processing, ICASSP 94, Vol II,pp 9 –12,1994.

A. Fred and J. Leitão. A Heuristic-Based Context-Free Parsing Algorithm. In Proc. of the Int’l Conference on Acoustics, Speech and Signal Processing, ICASSP 93, pp 67 – 70, 1993.

A. Fred and J. Leitão. Use of stochastic grammars for hypnogram analysis. In Proc. of the 11th IAPR Int’l Conference on Pattern Recognition, pp 242 –245,  1992.