A conceptual graph (CG) is a graph representation for logic based on the semantic networks of artificial intelligence and the existential graphs of Charles Sanders Peirce. CG design principles emphasize the requirements for a cognitive representation: a smooth mapping to and from natural languages; an “iconic” structure for representing patterns of percepts in visual and tactile imagery; and co...

While learning mathematics or computer science, beginning students often encounter significant problems with abstract concepts. In both subjects there tend to be large numbers of students failing the class or dropping out during the first semesters. There is a substantial existing body of literature on this topic from a didactic perspective, but in our opinion an investigation from a semioticco...

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This article introduces some basic functions and architectural issues for building a tool for programming conceptual models for explainable expert systems. The programming tool is independent from a particular problem class or problem solving method. Our work is based on the KADS knowledge engineering methodology which results in a conceptual model, and we use Sowa ́s Conceptual Graphs (CG) as a...

Text mining is defined as knowledge discovery in large text collections. It detects interesting patterns such as clusters, associations, deviations, similarities, and differences in sets of texts. Current text mining methods use simplistic representations of text contents, such as keyword vectors, which imply serious limitations on the kind and meaningfulness of possible discoveries. We show ho...

In the traditional systems modeling approach, the modeler is required to capture a user’s view of some domain in a formal conceptual schema. The designer’s conceptualization may or may not match with the user’s conceptualization. One of the reasons for these conflicts is the lack of an initial agreement among users and modelers concerning the concepts belonging to the domain. Such an agreement ...

Conceptual Graphs (CGs) are a visual, logic based knowledge representation (KR) formalism. In this paper we show how Conceptual Graph Assemblies (CGAs), a combinatorial extension to Conceptual Graphs, can represent multiple perspectives on the same information and enable the creation and use of modular and reusable CG representations. The natural way of introduction disjunction in the logical s...

Although tools exist to aid practitioners in the construction of directed graphs typified by Conceptual Graphs (CGs), it is still quite possible for them to draw the wrong model, mistakenly or otherwise. In larger or more complex CGs it is furthermore often difficult–without close inspection–to see clearly the key features of the model. This paper thereby presents a formal method, based on the ...