The DOES is another name for the Thyristor. Geoff's earlier work at Bell Labs refers to the thyristor with this acronym.
Here's an example of a publication from 1992.
http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=163452&url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel1%2F16%2F4237%2F00163452.pdf%3Farnumber%3D163452
Somewhere I have a link to a declassified government document from 1990 describing it in detail, but I'll have to look hard to find it.