Linear Quadratic Regulator (LQR) design is one of the most classical optimal control problems, whose well-known solution an input sequence expressed as a state-feedback. In this work, finite-horizon and discrete-time LQR solved under stability constraints uncertain system dynamics. The resulting feedback controller balances cost value closed-loop stability. Robustness modeled using scenario app...

Design and engineering of networks requires the consideration of many possible configurations (different network topologies, bandwidths, traffic and policies). Network engineers may use network simulation to evaluate changes in network configuration, but detailed, packet-level simulation of many alternatives would be extremely time consuming. This paper introduces the concept of scenario prefil...

Scenarios are often proposed as a means of managing innovation in use-centred design. Here we discuss ‘how’. Scenarios allow design spaces to be mapped, both marking and pushing the boundaries of those spaces, and charting paths through the conceptual terrain therein. They achieve this through facilitating two modes of design discourse (backward and forward linking), and mapping the granularity...

When the requirements and the interaction design of a system are separated, they will most likely not fit together, and the resulting system will be less than optimal. Even if all the real needs are covered in the requirements and also implemented, errors may be induced by human-computer interaction through a bad interaction design and its resulting user interface. Such a system may even not be...

The ability of reconfiguring software architectures in order to adapt them to new requirements or a changing environment has been of growing interest. We propose a uniform algebraic approach that improves on previous formal work in the area due to the following characteristics. First, components are written in a highlevel program design language with the usual notion of state. Second, the appro...

Scenarios of human-computer interaction help us to understand and to create computer systems and applications as artifacts of human activity Ñas things to learn from, as tools to use in one's work, as media for interacting with other people. Scenario-based design of information technology addresses five technical challenges: Scenarios evoke reflection in the content of design work, helping deve...