DDI nears approval

Crash development of AIDS test nears goal.

Impending development of a blood test for AIDS has paved the way for an epidemiological study by the National Heart, Lung and Blood Institute. Blood samples from 200,000 presumably healthy donors will soon be drawn and stored, to be screened when the test becomes available. Donors and recipients of blood which tests AIDS-positive will then be followed to see if AIDS develops. The study raise...

Diffusion Directions Imaging (DDI)

Di usion magnetic resonance imaging (dMRI) is the reference in vivo modality to study the connectivity of the brain white matter. Images obtained through dMRI are indeed related to the probability density function (pdf) of displacement of water molecules subject to restricted di usion in the brain white matter. The knowledge of this di usion pdf is therefore of primary importance. Several metho...

The DDI Approach to Morphology

DDI stands for “Don’t Do It.” White (1980) used the acronym DDI in a delightful paper on garbage collection. He argued 25 years ago that the garbage collector should be run rarely – perhaps once a year – if at all. That’s pretty much how many of us work these days. We buy enough memory so we don’t have to clean up more than once a week. Rebooting is easier than garbage collecting. As for disks,...

Locating the Geographic Center of DDI 3.0

Is Approval Voting Optimal Given Approval Votes?

Some crowdsourcing platforms ask workers to express their opinions by approving a set of k good alternatives. It seems that the only reasonable way to aggregate these k-approval votes is the approval voting rule, which simply counts the number of times each alternative was approved. We challenge this assertion by proposing a probabilistic framework of noisy voting, and asking whether approval v...