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Jan C. Willems was born in Bruges in Flanders, Belgium. His interests turned to geometric control and questions of disturbance decoupling. He introduced the notion of almost invariant subspaces which allows the solution of a number of control problems involving high gain feedback.
In the mid 80's, he became conscious of the limitations of input/output thinking as the framework for the analysis and synthesis of open and interconnected systems. This uneasiness led him to develop what is called the behavioral approach, in which a dynamical system is simply viewed as a family of trajectories. This work also emphasizes the importance, for example in object oriented modeling, of latent variables in addition to the manifest variables which the model aims at. In the behavioral setting, interconnection is viewed as variable sharing, and control is viewed as interconnection, with feedback as an important special case. The original ideas were introduced in an early paper in the, now defunct, Italian journal Ricerche di Automatica. A more extensive development appeared in a 3-part paper in Automatica in 1986-87, and in a paper in Dynamics Reported in 1989. Other convenient sources for these ideas are two papers in the IEEE Transactions on Automatic Control (1991 and 1997), a textbook (co-authored with Jan Willem Polderman) published by Springer Verlag, and an expository article published in the IEEE Control Systems Magazine in 2007. In 1988, he was awarded the Automatica Prize Paper Award for the series of 3 articles in which the behavioral framework was put forward.
Professor Willems became a fellow of the IEEE, the Society for Industrial and Applied Mathematics, the American Mathematical Society, and the International Federation of Automatic Control. He has held the unavoidable administrative positions in his department at the University of Groningen, including a six year term as director of research. He served terms as chairperson of the European Union Control Association and of the Dutch Mathematical Society (Wiskundig Genootschap). He has been on the editorial board of a number of journals, in particular, as managing editor of the SIAM Journal of Control and Optimization and as founding and managing editor of Systems & Control Letters.
In the mid 80's, he became conscious of the limitations of input/output thinking as the framework for the analysis and synthesis of open and interconnected systems. This uneasiness led him to develop what is called the behavioral approach, in which a dynamical system is simply viewed as a family of trajectories. This work also emphasizes the importance, for example in object oriented modeling, of latent variables in addition to the manifest variables which the model aims at. In the behavioral setting, interconnection is viewed as variable sharing, and control is viewed as interconnection, with feedback as an important special case. The original ideas were introduced in an early paper in the, now defunct, Italian journal Ricerche di Automatica. A more extensive development appeared in a 3-part paper in Automatica in 1986-87, and in a paper in Dynamics Reported in 1989. Other convenient sources for these ideas are two papers in the IEEE Transactions on Automatic Control (1991 and 1997), a textbook (co-authored with Jan Willem Polderman) published by Springer Verlag, and an expository article published in the IEEE Control Systems Magazine in 2007. In 1988, he was awarded the Automatica Prize Paper Award for the series of 3 articles in which the behavioral framework was put forward.
Professor Willems became a fellow of the IEEE, the Society for Industrial and Applied Mathematics, the American Mathematical Society, and the International Federation of Automatic Control. He has held the unavoidable administrative positions in his department at the University of Groningen, including a six year term as director of research. He served terms as chairperson of the European Union Control Association and of the Dutch Mathematical Society (Wiskundig Genootschap). He has been on the editorial board of a number of journals, in particular, as managing editor of the SIAM Journal of Control and Optimization and as founding and managing editor of Systems & Control Letters.
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