The integration of knowledge extracted from different models described by domain experts or from models generated by machine learning algorithms is strongly conditioned by the lack of an appropriated framework to specify and integrate structures, learning processes, data transformations and data models or data rules. In this work we extended algebraic specification methods to be used in this ty...

This paper introduces a Semiotic Appoach to Hypertext Theory. Having been applied to Informatics only in recent years, Semiotics promises a broader understanding of Hypertext as a structure of signs. The rapid visualization of the World Wide Web seems to justify this approach. Using the methodology of applied Semiotics and Graph Theory, the author analyses the challenges and restrictions of Hyp...

This talk presents implications from Experimental Semiotics for dialogue systems. Experimental Semiotics investigates human communication by forcing participants to create new communication systems, or adapt existing systems in new ways to achieve joint goals. The key results in this field show the importance of interaction, indirect representation, iconicity, and systematicity in the represent...

Ontology Charting (OC) is an Organisational Semiotics (OS) technique for the representation of requirements for information systems and organisations, based on semiotic theories and studies, incorporating technical and social aspects. The application of semiotics to the design of Information Systems (IS) competes with other methods and this paper presents a comparative analysis of these methods...

The Tatami project is building a system to support software engineering over the internet, exploiting recent advances in web technology, interface design, and specification. Our effort to improve the usability of such systems led us into algebraic semiotics, while our effort to develop better formal methods for distributed concurrent systems led us into hidden algebra. We discuss the Tatami sys...

It is already agreed that requirements have a critical impact on the quality and users satisfaction of the resulting software. In this work, web information systems are reviewed from the perspective of organizational semiotics as being part of an organization, which comprises work practices, rules and views of the same system by different stakeholders. This paper presents a case study, where ar...

Psilocybin has been used for centuries for religious purposes; however, little is known scientifically about its long-term effects. We previously reported the effects of a double-blind study evaluating the psychological effects of a high psilocybin dose. This report presents the 14-month follow-up and examines the relationship of the follow-up results to data obtained at screening and on drug s...