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In reference to developing a desktop deco program,
>Carl Meilahn says:
>I have been toying with...[or] DCIEM if I could get
>my hands on a math representation,
Christina says:
-------->8 snip
>I am also currently reading Weinke's book... it reminds me of my old
>days in optimal control class with the Hamiltonians and all.
>
>My question is about the DCIEM algorithm. I have both the DCIEM
>Manual and John Lippman's _Deeper Into Diving_, which gives some
>background about the DCIEM table development, but neither of these
>say anything about the algorithm. Is it published somewhere, or is
>it proprietary?
>
>If it is not published anywhere, just how hard would it be to reverse
>engineer it from the multitude of tables they give you in the manual?
>
Christina--
I have those books too. Lippman n is very useful in describing the
general workings of the DCIEM theory and table development. It has
gone through several iterations, and I believe the most recent version
used in the tables is the Kidd and Stubbs (KS)-1983 model. This is
apparently just a modification of the KS-1971 to account for actual
dive data. It is a 3 compartment model, with the tissue compartments
"connected" serially. "Straight" Haldanean models use tissues in parallel.
I remember reading in some paper or article around here what the tissue
half-times are, and also the max allowable tissue tensions. I seem to
remember 23 minutes for all 3, with Max tissue tensions only req'd for
the first two. I am not entirely sure where I got this from, so it may
be completely bogus.
On the other hand, it may be completely proprietary, but I find it hard to
believe that Kidd and Stubbs didn't publish anything on their research.
With that in mind, a search of related articles might turn something up.
Who knows, maybe someone on techdiver knows of or has one. If so,
I'd like to get my hands on it (or a copy). I also have the DCIEM Diving
Manual with the O2 deco, and mixed gas tables in it. It doesn't say
anything about the algorithm. It's really just a book of deco tables and
data collection sheets.
BTW, DCIEM does have a program that is a straight table lookup that
they provide (US $10-15 ?) as a tutor. It's interesting, but not very
useful. I got my copy at DEMA this spring.
I think a reverse engineer would be _possible_ but potentially difficult.
I also think I understand where K & S were heading with the serial
variation of haldanean theory, and might be able to work out a
comprable formula for calculations. I believe it's a standard log-in/
log-out style.
I have to run. If I think of something more, or a reference for anything,
I'll post again.
Carl W. Meilahn
NAUI Instr. # 14470
NSS/CDS Full Cave Diver
IANTD EANx # 7460, EANx Cave Diver # 152
cmeilahn@cc*.cc*.ut*.ed*
cmeilahn@cs*.ut*.ed*
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