Knowledge representation and reasoning in real-world applications often require to integrate multiple aspects of space. In this paper, we focus our attention on the so-called Rectangular Cardinal Direction calculus for qualitative spatial reasoning on cardinal relations between rectangles whose sides are aligned to the axes of the plane. We first show how to extend a tractable fragment of such ...

Do established predictors of children’s arithmetic performance differentially predict performance on timed versus untimed calculation tests? We investigated phonological awareness (i.e., CTOPP), phonological working memory (i.e., digit span), and visuo-spatial short-term memory (i.e., Corsi blocks) as predictors of timed and untimed calculation, both concurrently in Grade 1 (N= 116) and longitu...

What is needed for an analysis of the existing approaches to qualitative spatial reasoning and for a deeper understanding of the domain of space is a unifying theory that explains all of the concepts used for the representation of the different aspects of space by some primitive but well understood relations. In order to provide such primitive relations it will be shown that the concepts used i...

geographic information and analysis provide a wide range of data and techniques to monitor and manage natural resources. as an important case, in arid and semi-arid areas, water management is critical for both local governance and citizens. as a result, the estimation of water potential brought by snowmelt runoff and rainfalls seems to be very useful and important for these areas. hydrological ...

Abstract Spatiotemporal variation in fish assemblage structure was conducted from January to December 2015 in order to know the impacts of sanctuary on ichthyo-faunal diversity with its indices and major hydrological factors from six sampling stations of Karatoya fish sanctuary sectioned in the river Karatoya. A total of 69 fish species was obtained from this sanctuary including 21 threatened ...

We are developing a system in which a user can control virtual agents through natural language dialogue. We particularly focus on the semantic analysis of spatial expressions in natural language instructions. Spatial expressions are relative to the speaker’s viewpoint and the indicated positions can change dynamically. In this paper we propose a semantic representation using lambda structures. ...