DiaGen is a tool for specifying a visual language and generating a graphical editor from such a specification. The specification is mainly based on graph transformation and graph grammars. This paper demonstrates DiaGen and its features by briefly describing how DiaGen can be used to generate a simplified version of an application which is used in education courses for electrical engineers.

In this article we introduce a usage-goal framework within which task design can be guided and analyzed. We tell a tale of one task, the Pentomino Problem, and its evolution through predictive analysis, trial, reflective analysis, and adjustment. In describing several iterations of the task implementation, we focus on mathematical affordances embedded in the design and also briefly touch upon p...

iran enjoys a glorious history in medicine, ophthalmology and optics and has introduced several great physicians and ophthalmologists to the world. the history of ophthalmology dates back to 6000 years ago; unfortunately we have no manuscripts or petrographies from those eras. the oldest document about ophthalmic diseases can be found in avesta. furthermore, as early as 1600 years ago, genta sh...

Here, we briefly outline the history of fission yeast, its life cycle, and aspects of its biology that make it a useful model organism for studying problems of eukaryotic molecular and cell biology.

In the first part of this paper, the Ritter-Kolb catalogue (RKcat for short), its history and a few examples of its application to research in the field of cataclysmic variables are briefly described. In a second part we look forward to possible future applications of RKcat for the study of cataclysmic variables, low-mass X-ray binaries and related objects. Last but not least we also briefly co...

This paper, after briefly describing our context and the problems faced by science and engineering students studying mathematics, presents WALLIS, a webbased system that is being developed to address some of these problems. Keeping in mind pedagogy and the development of a learner-centred application, we first describe the iterative methodology which we employed, and theories (such as construct...

Absfracf-The principles of ray optics and, in more detail, some selected applications of ray techniques to electromagnetic8 are reviewed briefly. It is shown how a systematic use of matrix representation for the wavefront curvature and for its transformations simplify the handling of arbitrary pencils of rays and, consequently, the field computations. The same methods apply to complex rays whic...

The conventional computational description of brain operations has to be understood in a metaphorical sense. In this paper arguments supporting the claim that this metaphor is too restrictive are presented. A new metaphor more accurately describing recently discovered emergent characteristics of neuron functionality is proposed and its implications are discussed. A connectionist system fitting ...

IN THIS report we shall examine the findings which relate an interview-based index of rheumatoid arthritis (RA) to diverse forms of status inconsistency. We shall begin by presenting briefly the theoretical rationale which justifies our interest in this rather complex concept and a few studies will be cited to illustrate its empirical usefulness. Next, the measurement procedures will be describ...

Verbmobil is a project sponsored by the German government, whose aim is to develop a translation system for face-to-face speech dialogue. This book is the report on a preliminary study of the project conducted by CSLI, Stanford University. The contents of the book are as follows: Chapter 1 contains introductory material; Chapter 2 and Chapter 3 are devoted to describing the current state-of-the...