Dear Ludwig, Obviously the CRM is not a full model for the description of scientific measurements. The question of encoding value conditions under which a measurement is done is interesting. on the other hand I wonder if the conditions are relevant for queries, such as:
Give me all engines in all museums that have horsepower between ... at 150-160 rpm....... If this is actually not the case, but these data are relevant to interprete the quality of the measurement, then I'd argue the conditions are well-placed in the "has note" of the measurement, which can be typed again. Else, I suppose certain conditions can be regarded as type of the measurement, e.g. max horse power, speed at max horse power, etc. I suppose the selection of conditions is not random. So tell us what the logic is. This could be typed again. What do you think? Martin Ludwig Schletzbaum wrote:
Hi everybody, I'm dealing with a problem in Measurement Events concerning parameters of a measurement. A Measurement Event observed a Dimension which has type or appellation power of a Man made Object Diesel-Engine No 3 of Rudolph Diesel. The Dimension has value 14.7 has unit kW. The Problem is, that this measurement has a lot of parameters. For instance the number of crank revolutions per minute, the air pressure, the kind of fuel, the amount of fuel per burning stroke etc. The motor speed could be influenced in an Activity (accelerating the engine to 172 rpm, which contains or preceeds (had specific purpose; was continued by) the following Measurement Event. But not the measurement of the static air pressure (which is of course motivated by the measurement of the power). The consequence is to observe more than one Dimension in one Measurement Event. But that shows not, what the parameters really are. Another workaround whould be to declare the measurement of the power to "power at motor speed 172 rpm and air pressure 1013 hPa". Considered, that power 14.7 kW is the maximum power and the speed observed beneath is 172 rpm. Parameters play a large role in measurements. Remember, that green is not green, but only that what you understand that is green. Sincerely Ludwig Schletzbaum
-- -------------------------------------------------------------- Dr. Martin Doerr | Vox:+30(2810)391625 | Principle Researcher | Fax:+30(2810)391638 | Project Leader SIS | Email: [email protected] | | Information Systems Laboratory | Institute of Computer Science | Foundation for Research and Technology - Hellas (FORTH) | | Vassilika Vouton,P.O.Box1385,GR71110 Heraklion,Crete,Greece | | Web-site: http://www.ics.forth.gr/isl | --------------------------------------------------------------
