| Hi Mark,
If I remember correctly, La Roquette project was a scheduling
application (OPS5) for the supply of fluid to an irrigation system;
I think the fluid was waste from some potato processing plant.
Thanks for reminding me, it has some connection with what I am looking for
since it involves Fluids. I will get the details I need from Stephane R.
Joe.
|
| Mark,
ROQUETTE project goes on. We signed a contract for evolutive
maintainance which has brought to us a few 100K FF/year for 3
years besides the inital 1 Mff deal.
ROQUETTE is not really a water supply company, and the water
supply problem they are faced with is quite specific :
- waste water comes from potatoe-sturch process
- big tank (several 1000 m3) at plant output is filled within a
few hours
- waste water is brought outside using large fixed pipes
- several teams work 20 hours a day connecting flexible pipes to
these fixed pipes, in order to spread water on "allowed" land
areas (according to contracts with peasants).
The system developped 3 years ago is used to schedule spreading of
waste water (i.e. select next land area for spreading, from a
database) according to various contraints :
- soil type,
- culture type,
- minimum equipement (pipes, watergun) moves,
- working hours,
- minimum pressure drops,
- sensitivity to weather conditions (wind, rain, ...)
- sensitivity to environmental/political constraints ("preferred
peasants", waterguns owners, hunting...).
System is used to design preliminary schedules, and to reschedule
after unpredicted events. 2 last years improvements are about :
- graphical outputs (Gantt Charts)
- heuristics to avoid 90% of bactracking : time to run a
complete case has been reduced from a few hours to a few
minutes, allowing to do simulations.
- change in the way operations are carried out.
It is implemented in OPS5 (# 500-600 rules) with C, TDMS (DECforms
soon), COBOL on a VAXstation 3100.
Hope this can help,
Cheers,
-- St�phane --
|
| Stephane,
We have had no contact with CGE, my question is based upon an article
whihc apppeared in an AI Journal, about which I would like more info such as
"was Digital involved in any of their projects?". I wanted to use the info
as industry ref. for a UK project proposal.
Joe.
|