Photographs at war

Paxos at war

The optimistic latency of Byzantine Paxos can be reduced from three communication steps to two, without using public-key cryptography. This is done by making a decision when more than (n + 3f)/2 acceptors report to have received the same proposal from the leader, with n being the total number of acceptors and f the number of the faulty ones. No further improvement in latency is possible, becaus...

Photographs

Recovering the Subpixel PSF from Two Photographs at Different Distances

In most typical digital cameras, even high-end digital single lens reflex ones (dslr), the acquired images are sampled at rates below the Nyquist critical rate, causing aliasing effects. In this work we describe a new algorithm for the estimation of the point spread function (psf) of a digital camera from aliased photographs, that achieves subpixel accuracy. The procedure is based on taking two...

Medical women at war, 1914-1918.

Women had a long and difficult struggle before they were allowed to obtain a medical education.' Even in 1914 the Royal Free was the only London teaching hospital to admit them and some universities (including Oxford and Cambridge) still held out against them. The cost of a medical education continued to be a major obstacle, but at least there were enough schools by then to ensure that British ...

Women at War: An Evolutionary Perspective