A formal framework for specifying and developing agents/robots must handle not only knowledge and sensing actions, but also time and concurrency. Researchers have extended the situation calculus to handle knowledge and sensing actions. Other researchers have addressed the issue of adding time and concurrent actions. Here both of these features are combined into a unified logical theory of knowl...

Software architecture constitutes the primary design of a software system. Consequently, architectural design decisions involved in architecture design have a key impact on the system in such aspects as future maintenance costs, resulting quality, and timeliness. However, the applied knowledge employed and the design decisions taken by soihvare architects are not explicitly represented in the d...

•Describing actions and their effects in a dynamic system •A set of first-order axioms, mainly includes: Dap (precondition axioms): For each A(~x), Poss(A(~x), s) ≡ φA(~x, s) Dssa (successor state axioms): For each fluent F (~y, s), F (~y, do(a, s)) ≡ ∨ iψ + i (~y, a, s) ∨ F (~y, s) ∧ ¬( ∨ j ψ − j (~y, a, s)) DS0 (an initial theory): All facts hold in the initial situation S0 Duna (unique name ...

We propose an action formalism that is based on description logics (DLs) and may be viewed as an instance of the Situation Calculus (SitCalc). In particular, description logic concepts can be used for describing the state of the world, and the preand post-conditions of actions. The main advantage of such a combination is that, on the one hand, the expressive power for describing world states an...

A team of agents is jointly able to achieve a goal if despite any incomplete knowledge they may have about the world or each other, they still know enough to be able to get to a goal state. Unlike in the single-agent case, the mere existence of a working plan is not enough as there may be several incompatible working plans and the agents may not be able to choose a share that coordinates with t...