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Formal definition of self-reproduction may have importance the Alife research program, especially for application of its achievements outside the discipline. The paper examines two formal definitions of self-reproduction, suggested by McMullin and Löfgren. It is pointed out

. In this direction we propose a novel methodology to learn formal definitions for biomedical concepts from unstructured text. We evaluate experimentally the suggested methodology in learning formal definitions of SNOMED CT concepts, using their text definitions from MeSH. The evaluation is focused on the learning

This paper gives the formal definition of the parameterized aspect calculus, or ςasp. The ςasp calculus is a core calculus for the formal study of aspect-oriented programming languages. The calculus consists of a base language, taken from Abadi and Cardelli’s object calculus, and point cut

In this paper we define formally a wide variety of separation-of-duty (SoD) properties, which include the best known to date, and establish their relationships within a formal model of role-based access control (RBAC). The formalism helps remove all ambiguities of informal definition, and offers a

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any doubt, a definition and a formalization of our approach are necessary. This work is split in two. The first part relates to the proof of the validity of the approach used in Transformers. The second part is devoted to the correction and the Re-development of the existing tools in order

notation to describe precisely the functionality of components in the diagrams. This paper first describes the formal syntax and semantics of FRSM and then presents an example of using the axiom and inference rules given in the definition of the formal semantics for checking consistency of specifications

Enhanced Timed-LOTOS, denoted ET-LOTOS, is an extension of LOTOS that allows the modelling of real-time behaviours. It covers all the aspects of full LOTOS, including data types, it supports both a dense and a discrete time domain and can manipulate time values as any other data values. A tutorial on ETLOTOS, showing many application examples, has already been published [Le # L97]. The present paper adds to it by providing an in-depth presentation of its theoretical aspects. The complete semantics is given and explained, and its properties are studied. In particular, we prove that the semantics is consistent and that strong bisimulation is a congruence. This requires to deal carefully with the presence of negative premises in the operational semantics, which are necessary to express urgency. ET-LOTOS is also shown to be a conservative extension of LOTOS for guarded processes, and is the basis of the timed extension of LOTOS currently developed by ISO [ISO98]. To our knowledge, this is the first in-depth study of a language that combines data types and real-time behaviours.