This paper discusses current versions of WordNet from a data modelling perspective. We show that these versions do not consider basic data model desiderata for their design, like flexibility, extensibility and interoperability. We claim that a data model for WordNet must also consider the inherent network structure of WordNet data. Thus we make the case for an RDF model for WordNet and present ...

Fish tank VR systems provide head coupled perspective projected stereo images on a display device of limited dimensions that resides at a fixed location. Therefore, fish tank VR systems provide only a limited virtual workspace. As a result, such systems are less suited for displaying virtual worlds that extend beyond the available workspace and depth perception problems arise when objects that ...

The basic building blocks of Description Logics (DLs) in general are concept and role constructors (e. g. , intersection, union, nominals, negation etc.), terminological as well as individual axioms. Combining axioms, meaningful statements can be expressed. Additional axiom constructors (so-called syntactical sugar) has been introduced in most ontology language (such as OWL and OWL 2 [1]) in or...

This is an expository paper, aimed to provide a gentle introduction to missing data problems as viewed from graphical modeling perspective. Aside from producing new theoretical results, the graphical perspective offers researchers a transparent language in which to understand, articulate and analyze missing data problems. Users can specify graphical features of their problems before choosing so...

Integrated within neural circuits, astrocytes have recently been shown to modulate brain rhythms thought to mediate sleep function. Experimental evidence suggests that local impact of astrocytes on single synapses translates into global modulation of neuronal networks and behavior. We discuss these findings in the context of current conceptual models of sleep generation and function, each of wh...

Current tests for contagion in social network studies are vulnerable to the confounding effects of latent homophily (i.e., ties form preferentially between individuals with similar hidden traits). We demonstrate a general method to lower bound the strength of causal effects in observational social network studies, even in the presence of arbitrary, unobserved individual traits. Our tests requir...

This paper describes the design and analysis of a well test for determining hydraulic properties of a low permeability, low porosity formation that potentially contains a small amount of free methane. Estimation of gas-related parameters in such formations is difficult using standard pumping tests because (i) pressures and flow rates may fluctuate as a consequence of gas exsolution during the t...

Are there relationships between consciousness and the material world? Empirical evidence for such a connection was reported in several meta-analyses of mind-matter experiments designed to address this question. In this paper we consider such meta-analyses from a statistical modeling perspective, emphasizing strategies to validate the models and the associated statistical procedures. In particul...

We outline a procedure called communicative and material functions analysis that can be used to derive business modeling concepts. It is rooted in the language-action perspective on organizations and has its point of departure in Business Action Theory, an empirically grounded framework for modeling business processes from an action perspective. We apply this procedure to enhance an existing me...

This document presents an eeort towards nding a common understanding on how user and learner modeling systems, if seen as agents, can communicate with the applications. The fundamental characteristics of the communication between application agents (Apps) and user or learner modeling systems (ULMSs) are examined in order to draw some conclusions on what features should be considered within such...