This paper establishes a framework to automate the generation of a piecewise-affine approximation... more This paper establishes a framework to automate the generation of a piecewise-affine approximation for a class of nonlinear systems. The results enable a completely automated procedure for designing an output feedback controller using a method described previously. To perform the piecewise-affine approximation it is assumed that a uniform rectangular grid is provided for the domain of the nonlinearity. Given this grid, there are three basic steps of the algorithm presented in this paper. First, a simplicial partition of the grid is found that provides a partition of the entire state space into polytopic cells. Then, the piecewise-affine approximation of the nonlinearity within each cell of the partition is derived. Finally, a polytopic description of the cells and a parametric description of the boundaries between cells is created. Each cell of the partition will have a closed loop equilibrium at a point that must be specified. This paper presents an optimization objective that can be used to automate the selection of these equilibrium points. All steps in this process axe completely automated, which represents a key step in the development of control synthesis tools for piecewise-affine approximations of nonlinear systems
Abstract: Local area networks form the basis of a number of distributed real-time systems. While ... more Abstract: Local area networks form the basis of a number of distributed real-time systems. While current standard technology does not solve all problems related with achieving real-time behaviour---in essence, bounded and known message delivery delays---designers should be able to build reliable LAN-based real-time systems now, using existing technology, VLSI, and namely, non-replicated architectures. Methods and techniques that make this possible are worthwhile being studied. This paper describes the concepts and ...
The authors detail the goals of the ROMANCE (replicated object management configurable environmen... more The authors detail the goals of the ROMANCE (replicated object management configurable environment) project and present its software architecture and current status. A fundamental goal of the project is to experiment with group technology. In ROMANCE, distribution and replication are implemented using underlying group communication and membership services. The authors also describe how these tools are used to achieve ROMANCE goals
The distributed systems architect assembles pieces of hardware that are at least as large as a co... more The distributed systems architect assembles pieces of hardware that are at least as large as a computer or a network router, and assigns pieces of software that are self-contained-such as Java applets-to those hardware components. As system complexity, size and diversity grow, the probability of inconsistency, unreliability, non-responsiveness and insecurity, increases. It is absolutely necessary for distributed systems architects to understand the management of such complex systems. Distributed Systems for System Architects ...
This paper establishes a framework to automate the generation of a piecewise-affine approximation... more This paper establishes a framework to automate the generation of a piecewise-affine approximation for a class of nonlinear systems. The results enable a completely automated procedure for designing an output feedback controller using a method described previously. To perform the piecewise-affine approximation it is assumed that a uniform rectangular grid is provided for the domain of the nonlinearity. Given this grid, there are three basic steps of the algorithm presented in this paper. First, a simplicial partition of the grid is found that provides a partition of the entire state space into polytopic cells. Then, the piecewise-affine approximation of the nonlinearity within each cell of the partition is derived. Finally, a polytopic description of the cells and a parametric description of the boundaries between cells is created. Each cell of the partition will have a closed loop equilibrium at a point that must be specified. This paper presents an optimization objective that can be used to automate the selection of these equilibrium points. All steps in this process axe completely automated, which represents a key step in the development of control synthesis tools for piecewise-affine approximations of nonlinear systems
Abstract: Local area networks form the basis of a number of distributed real-time systems. While ... more Abstract: Local area networks form the basis of a number of distributed real-time systems. While current standard technology does not solve all problems related with achieving real-time behaviour---in essence, bounded and known message delivery delays---designers should be able to build reliable LAN-based real-time systems now, using existing technology, VLSI, and namely, non-replicated architectures. Methods and techniques that make this possible are worthwhile being studied. This paper describes the concepts and ...
The authors detail the goals of the ROMANCE (replicated object management configurable environmen... more The authors detail the goals of the ROMANCE (replicated object management configurable environment) project and present its software architecture and current status. A fundamental goal of the project is to experiment with group technology. In ROMANCE, distribution and replication are implemented using underlying group communication and membership services. The authors also describe how these tools are used to achieve ROMANCE goals
The distributed systems architect assembles pieces of hardware that are at least as large as a co... more The distributed systems architect assembles pieces of hardware that are at least as large as a computer or a network router, and assigns pieces of software that are self-contained-such as Java applets-to those hardware components. As system complexity, size and diversity grow, the probability of inconsistency, unreliability, non-responsiveness and insecurity, increases. It is absolutely necessary for distributed systems architects to understand the management of such complex systems. Distributed Systems for System Architects ...
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Papers by Luis Rodrigues