The study of composed software and its properties is in itself a great challenge. Bringing quantitative aspects into the picture increases the complexity of the analysis and entails the need for reconciling both the classical and the stochastic analyses. The quest herein is to provide constructs for composition of building blocks and semantic models thereof which enable both analyses and allow ...

In this paper, we present preliminary results on achievables rates in half-duplex cooperative multiple access channels (CMAC). We show that the upper bound on the capacity of the half-duplex CMAC can be solved using convex optimization techniques. Under a Gaussian model, we study the maximal achievable rate by every node in the network. We propose a number of scenarios, encompassing existing an...

This paper presents a hybrid audio programming environment, called FAUCK, which combines the powerful, succinct Functional AUdio STream (FAUST) language with the strongly-timed CHUCK audio programming language. FAUCK allows programmers to on-the-fly evaluate FAUST code directly from CHUCK code and control FAUST signal processors using CHUCK’s sample-precise timing and concurrency mechanisms. Th...

Operating guidelines have been introduced to characterize all controllers for a given service S. A controller of S is a service that interacts with S without deadlocking. An operating guideline of S can be used to decide whether S refines another service. It is a special-purpose structure to describe the behavior of service S from the perspective of its controllers rather than from the perspect...

A semiformal development method for obtaining a correct design of embedded control and real-time systems is presented. The design is obtained from a Colored Petri Net (CPN) model of a real-time system, which is subsequently transformed into a formal system specification using CSP+T process algebra. The method translates CPN modelling entities into abstract processes, which allow the expression ...

The transparency and flexibility of the syntax-directed compilation technique, as used in the Tangram (now Haste) and Balsa synthesis systems, comes at the cost of performance overhead. Some control resynthesis and peephole optimisation techniques have been proposed to reduce this performance penalty. In this paper, we introduce new peephole optimisations for Balsa dual-rail circuits. The metho...

HyPA is an algebraic theory based on the classical process algebra Algebra of Communicating Processes (ACP) for the specification and analysis of hybrid systems. We have the idea that HyPA is also well suited for addressing various aspects of digital embedded systems including hardware, software and concurrency, as well as mixed-signal designs. To show that HyPA is useful for the specification ...