We propose a calculus, cCOA, combining, thus more expressive than each of, two orientation calculi well-known in QSR: Frank’s projection-based cardinal direction calculus, CDA, and a coarser version, ROA, of Freksa’s relative orientation calculus. An original constraint propagation procedure, PcS4c+(), for cCOA-CSPs is presented, which aims at (1) achieving path consistency (Pc) for the CDA pro...

The technique is pennant diagrams, introduced with several kinds of bibliographic data in White (2007a, b, 2009, 2010). White’s examples to date, including the one in this paper, have required datagathering in the Dialog search system (with its Rank command), to which many information scientists lack access. However, simple pennant diagrams, using 25 co-cited author names, have also been progra...

We encountered the need for a theory of forgetting in our work on Cognitive Robotics. 1 In our effort to control an autonomous robot, we imagine the robot has a knowledge base representing the initial world state. As the robot performs actions, she needs to bring the knowledge base up to date. To do so, she needs to forget about all the facts that are no longer true, and in such a way that this...

The proposed contribution presents the results of an on going research work aiming at the implementation of a knowledge based system devoted to supporting the local government and the citizenship during the setting up process of a Regional Natural Park in Southern Italy. The system architecture integrates Group Decision Support Technology already available on the enterprise software market with...

An anytime family of propositional reasoners is a sequenceR0;R1; : : : of inference relations such that each Ri is sound, tractable, and makes more inferences than Ri 1, and each theory has a complete reasoner in the family. Anytime families are useful for resource-bounded reasoning in knowledge representation systems. Although several anytime families have been proposed in the literature, only...

Some 50% of the people in the world live in rural areas, often under harsh conditions and in poverty. The need for knowledge of how to improve living conditions is well documented. In response to this need, new knowledge of how to improve living conditions in rural areas and elsewhere is continuously being developed by researchers and practitioners around the world. People in rural areas, in pa...

Background: Ethnobotany is the study of a region's plants and their practical uses through the traditional knowledge of a local culture and people. Traditional plant usage for medicinal purposes is a main part of indigenous people culture which has been formed during centuries in rural area. This knowledge has played important role in the development of new drugs on the modern medicine. Object...