Help texts and references for the Populus models are collected in a single large “portable document” file (pdf), accessible via Adobe Acrobat Reader. To minimize downloaded file sizes, we provide an English-language version as the default help system, with Spanish and Portuguese translations available as alternatives. At present, both the Spanish and Portuguese translations are incomplete, and ...

The demand for Assistive Technology products is considered through a methodological approach which provides a framework for the analysis of selected aspects of the Assistive Technology (AT) market. Throughout the paper, the AT market is considered from a socio-economic perspective; as a system which is considerably influenced by demographics. This allows the application of systems dynamics in o...

The Intelligent Dictionary Help System (IDHS) is a monolingual (explanatory) dictionary system. Its design was conceived from the study of questions that human users would like to have answered when consulting a dictionary. The fact that it is intended for people instead of automatic processing distinguishes it from other systems dealing with the acquisition of semantic knowledge from conventio...

Consider a sequence of i.i.d. random variables, where each variable is refreshed (i.e., replaced by an independent variable with the same law) independently, according to a Poisson clock. At any xed time t, the resulting sequence has the same law as at time 0, but there can be exceptional random times at which certain almost sure properties of the time 0 sequence are violated. We prove that the...

Version 2.10.0 of R includes new code for processing ‘.Rd’ help files. There are some changes to what is allowed, and some new capabilities and opportunities. One of the reasons for the success of R is that package authors are required to write documentation in a structured format for all of the functions and datasets that they make visible in their packages. This means users can count on askin...