Mailing List Archive Mailing List Archive
On Mon, 21 Nov 1994, Carl Meilahn wrote:
>
> 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.
The DCIEM model was originally published 1983 as a series of four
technical bulletins. The first bulletin described the model, bulletin 2
& 3 were devoted to all of the original test data, and bulletin 4
consisted of the dive manual/tables. I have all of the original
publications, I can not remeber how detailed the model description was
but will check and post the information.
===========================================================================
Curt W. Smitka, Administrative Manager Phone: (313) 936-0702
Department of Environmental Fax: (313) 764-9424
and Industrial Health E-mail: CWSMITKA@UM*.ED*
School of Public Health
University of Michigan
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