IEEE Circuits and Systems Magazine - Q2 2022 - 54

in mind an adequate definition of system theory for
Engineering applications.
Acknowledgment
A few days before the end of the revision procedure, my
friend J. Tenreiro Machado had a sudden cardio-respiratory
arrest and died. Here I want to express my gratitude
and tribute to a great man and scientist. He was a
very friendly and helpful person, with an unusual work
capacity that allowed him to publish interesting articles
on a wide range of topics.
This work was partially funded by National Funds
through the Foundation for Science and Technology of
Portugal, under the projects UIDB/00066/2020.
Manuel Duarte Ortigueira received the
Electrical Engineering degree at Instituto
Superior Técnico, Universidade
Técnica de Lisboa, in April 1975 and the
PhD and Habilitation degrees at the
same Institution in 1984 and 1991, respectively.
Nowadays he is Associate Professor with Habilitation
(retired) at the Electrical Engineering Department
of the Faculty of Sciences and Technology of Nova
University of Lisbon. He was professor at Instituto Superior
Técnico and Escola Náutica Infante D. Henrique. He
published 3 books on Digital Signal Processing, Fractional
Calculus, and Fractional Signals and Systems, over 180
papers in journals and conferences with revision, and
has 2 registered patents. His research activity started in
1977 at Centro de Análise e Processamento de Sinais,
continued at Instituto de Engenharia de Sistemas e Computadores
(INESC), where he was with the Digital Signal
Processing and Signal Processing Systems groups, and
since 1997, at Instituto de Novas Tecnologias (UNINOVA),
where he is with the Signal Processing group of Center of
Technology and Systems. He is regular reviewer of several
international journals and member of the scientific
committee of several international journals and conferences.
Nowadays his main scientific interests are Fractional
Signal Processing, Digital Signal Processing and
Biomedical Signal Processing.
J. Tenreiro Machado graduated with
the 'Licenciatura' degree in Electrical
Engineering at the University of Porto,
in 1980, obtaining the Ph.D. and 'Habilitation'
degrees in 1989 and 1995, respectively,
in Electrical and Computer
Engineering. He worked as Professor for the Electrical
and Computer Engineering Department of the University
of Porto, during 1980-1998. Since 1998 he worked at the
Institute of Engineering, Polytechnic Institute of Porto,
54
IEEE CIRCUITS AND SYSTEMS MAGAZINE
where he was Principal Coordinator Professor at Dept.
Electrical Engineering. His research interests included
Fractional-order Systems, Nonlinear Dynamics, Complex
systems, Modeling, Control, and Entropy. He was member
of the Editorial Board, Associate Editor, and Editor in
Chief of several journals. He was editor of Special Issues
in several journals, editor and author of several books.
References
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