There are two categories of objects spatial information science investigates: actual objects and their spatial properties, such as in geography, and abstract objects which are employed metaphorically, as for visual languages. A prominent example of the latter are diagrams that model knowledge of some domain. Different aspects of diagrams are of interest, including their formal properties or how...

Maintainability is an increasingly relevant quality aspect in the development of object oriented software systems (OOSS). It is generally accepted that OOSS maintainability is highly dependent on the decisions made early in the development life cycle. Conceptual modelling is an important task of this early development. So that the maintainability of conceptual models have a great influence on t...

Voronoi diagrams are a well-studied data structure of proximity information, and although most cases require Ω(n log n) construction time, it is interesting and useful to develop linear-time algorithms for certain Voronoi diagrams. We develop a linear-time algorithm for abstract Voronoi diagrams in a domain where each site has a unique face and no pair of bisectors intersect outside the domain....

We present a general framework for computing two-dimensional Voronoi diagrams of different site classes under various distance functions. The computation of the diagrams employs the cgal software for constructing envelopes of surfaces in 3-space, which implements a divide-and-conquer algorithm. A straightforward application of the divide-and-conquer approach for Voronoi diagrams yields highly i...

This study investigated people’s mental representations of diagrams and whether these related to views about diagrams and problem solving performance. The participants were 93 undergraduate students who were asked to complete a questionnaire which included free writing on the topic of diagrams, and problem solving. Analysis of the statements and ideas that the students wrote revealed four categ...

To research collaborative interfaces for a blind/sighted pair we pick the application of viewing and editing node-link diagrams, such as UML (Unified Modeling Language) diagrams. Working with diagrams provides two benefits to the blind community. An accessible diagram interface provides blind users with access to the visual information in diagrams. Diagrams are significant for communicating ide...

Models for numerical simulations should be described in a coherent style. They are expected to have consistencies at the causal dependency level. However, System Dynamics causal loop diagrams can have inconsistencies. This diagram style’s arrows, concerning flow and stock relationships, can have the opposite direction of stock flow diagrams which can numerically simulate models. These inconsist...

Mechanical systems have structural organizations-parts, and their relations-and functional organizations-temporal, dynamic, and causal processes-which can be explained using text or diagrams. Two experiments illustrate the role of arrows in diagrams of mechanical systems. In Experiment 1, people described diagrams with or without arrows, interpreting diagrams without arrows as conveying structu...

the present work was aimed to design and develop self-nanoemulsifying drug delivery systems (snedds) with the objective to overcome the problems associated with the delivery of talinolol, a hydrophobic and poorly bioavailable drugs having ph dependant solubility. the solubility of talinolol in various oils, surfactants, cosurfactants and aqueous phases were determined to identify and select the...