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Contract-based design is emerging as a unifying compositional paradigm for the specification, design and verification of large-scale complex systems. Different contract frameworks are currently available, but we lack a clear understanding of the relations between them. In this paper, we investigate the relation between interface theories (specifically, relational interfaces) and assume-guarantee (A/G)...
We introduce a platform-based design methodology that addresses the complexity and heterogeneity of cyber-physical systems by using assume-guarantee contracts to formalize the design process and enable realization of control protocols in a hierarchical and compositional manner. Given the architecture of the physical plant to be controlled, the design is carried out as a sequence of refinement steps...
Given a global specification contract and a system described by a composition of contracts, system verification reduces to checking that the composite contract refines the specification contract, i.e. that any implementation of the composite contract implements the specification contract and is able to operate in any environment admitted by it. Contracts are captured using high-level declarative languages,...
A new Maximum Power Point Tracking (MPPT) algorithm, based on the well known Perturb and Observe (P&O) method is presented. The proposed algorithm includes some refinements, as a three point comparison, variable duty-cycle increment and a timed reset of working parameters, allowing a more efficient control of a stand-alone photovoltaic system. The experimental results show the good response and...
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