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- Johan Nilsson, Bo Bernhardsson, Björn Wittenmark
- Automatica
- 1998

The paper discusses modeling and analysis of real-time systems subject to random time delays in the communication network. A new method for analysis of existing schemes is presented. The method is used to evaluate diierent suggested schemes from the literature. A new scheme for handling the random time delays is then developed and successfully compared with… (More)

In this paper a new interaction measure for stable multivariable systems is introduced. The interaction measure, the Hankel Interaction Index, is a dynamic extension of the underlying idea in the classic Relative Gain Array (RGA) and its various extensions. The new index is based upon the Hankel norm of the SISO elementary subsystems built from the original… (More)

- Björn Wittenmark
- Automatica
- 1989

Computers are today essential for implementing controllers in many different situations. The computers are often used in embedded systems. An embedded system is a built-in computer/microprocessor that is a part of a larger system. Many of these computers implement control functions of different physical processes, for example, vehicles, home electronics,… (More)

- Björn Wittenmark
- 1995

This paper gives an overview of di erent techniques for solving the dual control problem. The optimal solution can quite straightforwardly be characterized. The solution is, however, numerically demanding. A large number of suboptimal dual controllers have been developed over the years and the paper gives an overview and discussion of di erent approaches.

The industrial trend in embedded systems is than an increasing amount of control applications are implemented in distributed computer systems. Additional problems then face the designers such as significant and potentially varying end-to-end time-delays, the fact that data may be lost on the network, and that one or more nodes, or even parts of a node, may… (More)

- Björn Wittenmark, Helena Haglund, Mikael Johansson
- 1997

The paper presents interactive learning tools used in courses in automatic control at Lund Institute of Technology. The learning tools are aimed at improving the understanding of and intuition for the abstract parts of the control courses. The paper presents dynamic interactive modules for a course in sampled-data systems. The tools are implemented in… (More)

All service control nodes, for example web sites or Mobile Switching Centers, can be modeled as server systems with one or more servers processing the incoming requests. To avoid overload at the service node different types of admission control mechanisms are usually implemented. In this paper we discuss, from a control point of view, the modeling of a… (More)

- Karl Johan Åström, Ulf Borisson, Lennart Ljung, Björn Wittenmark
- Automatica
- 1977

- Maria Kihl, Anders Robertsson, Björn Wittenmark
- ISCC
- 2003