- From: John Graybeal <jbgraybeal@mindspring.com>
- Date: Wed, 16 Dec 2009 23:53:11 -0800
- To: Manfred Hauswirth <manfred.hauswirth@deri.org>
- Cc: Luis Bermudez <bermudez@sura.org>, Semantic Sensor Network Incubator Group WG <public-xg-ssn@w3.org>
On Dec 16, 2009, at 12:15, Manfred Hauswirth wrote: > Hi, > > Luis Bermudez wrote: > > [...] > >> Senors and sensor system can be model as process ( they can get >> some input and can produce some output). We are mainly interested >> in the output, this is why "process" is important > > Hmm, in my domain, process is an active component, whereas what you > describe, I would describe as a data stream (processing) system. > >> Sensors and platform have components, these is why they can be >> model as systems > > If you think in terms of hardware only, yes. What about the OS of a > sensor? Like TinyOS - what would that be? Well, it can certainly be modeled as a system, and it certainly has components. (See, I bet you thought 'component' meant hardware. But I didn't.) >> System and Process are two independent concepts. Maybe we should >> leave them that way and say sensor is subclass of both. > > Agreed. No one has told me what the difference between a System and a Process is. If you can't tell me the difference, I don't think there is one. > For me a sensor can be part of a process. A process can use sensors. > On the other hand a sensor can also implement a process. I found the only way it made sense to have a word 'sensor' that was different from a word 'device' was if the sensor was performing an atomic operation. I think this is still implementing a process, though. > A system on the other hand can consist of sensors and processes. A Process can include both sensors and processes. > Am I misunderstanding "system"? No, I think the confusion may be about Process, or maybe Component. > Best regards, > > Manfred > > -- > Prof. Manfred Hauswirth > Digital Enterprise Research Institute (DERI) > National University of Ireland, Galway (NUIG) > http://www.manfredhauswirth.org/ > -------------- I have my new work email address: jgraybeal@ucsd.edu -------------- John Graybeal <mailto:jgraybeal@ucsd.edu> phone: 858-534-2162 System Development Manager Ocean Observatories Initiative Cyberinfrastructure Project: http://ci.oceanobservatories.org Marine Metadata Interoperability Project: http://marinemetadata.org
Received on Thursday, 17 December 2009 07:53:49 UTC