Joe, (01)
Roughly the possibility of the event in certain circumstances. The relation
to the measurement may be more or less direct. In the case of maximum
operating temperature, one could argue it is the lack of an event as it is
intended to operate normally provided that the temperature is not exceeded. (02)
To illustrate the circumstances point, an example I was given recently wrt
an aircraft was the ability to fly at Mach 2.1. This was dependent upon it
(a) flying under its own steam, (b) in 'normal' weather, (c) in a standard
configuration, etc.
As this was a contractual requirement, it was important (and worth a lot of
money) to tie down. (03)
To reduce this to a common or garden example. You can buy a light bulb from
the supermarket that is claimed will last 2000 hours (its specification will
mention this quantity).
Now 2000 hours is a period of time. There seems to be relationship between
the bulb and the period of time.
However, it is not clear exactly which period of time is being referred to -
as the bulb may break in an accident or be thrown away well before it is
used for 2000 hours. And in these case we do not say that it could not in
principle have this property. Also, it may only last, say, 1500 hours, but
this not be a breach of the claim as the temperature in the room was not
normal. (04)
The relation here seems much more indirect that say the relation between
Descartes and the length of his life - in Descartes' case one would be happy
to say his life was just that long. (05)
Regards,
Chris Partridge
Chief Ontologist (06)
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> -----Original Message-----
> From: uom-ontology-std-bounces@xxxxxxxxxxxxxxxx [mailto:uom-ontology-std-
> bounces@xxxxxxxxxxxxxxxx] On Behalf Of Joe Collins
> Sent: 02 October 2009 15:29
> To: uom-ontology-std
> Subject: Re: [uom-ontology-std] "Indirect property" - more
>
> I am afraid that I'm not quite clear on the definition of "direct" and
> "indirect" with respect to quantities. Re-definition in terms of
> "manifestation"
> and "dispositional" don't help me much.
>
> Perhaps if I try to parrot back what has been discussed in my own terms,
you
> can
> tell me whether or not I've got it.
>
>
> A direct quantity is an estimate of an attribute of a physical object
> determined
> by an actual measurement event.
>
> An indirect quantity is a hypothetical estimate of an attribute of a
physical
> object, not referring to an actual measurement event, but to the
possibility
> of
> such an event.
>
>
> jbc
> --
> _______________________________
> Joseph B. Collins, Ph.D.
> Code 5583, Adv. Info. Tech.
> Naval Research Laboratory
> Washington, DC 20375
> (202) 404-7041
> (202) 767-1122 (fax)
> B34, R221C
> _______________________________
>
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