Bioethics are difficult to balance

Damaged BZip Files Are Difficult to Repair

bzip is a program written by Julian Seward that is often used under Unix to compress single files. It splits the file into blocks which are compressed individually using a combination of the Burrows-Wheeler-Transformation, the Move-To-Front algorithm, Huffman and Runlength encoding. The author himself stated that compressed blocks that are damaged, i.e., part of which are lost, are essentially ...

Which graphical models are difficult to learn?

We consider the problem of learning the structure of Ising models (pairwise binary Markov random fields) from i.i.d. samples. While several methods have been proposed to accomplish this task, their relative merits and limitations remain somewhat obscure. By analyzing a number of concrete examples, we show that low-complexity algorithms systematically fail when the Markov random field develops l...

Prevention of Iodine Deficiency: Difficult to Implement, More Difficult to Sustain

Why are Ferroelectric Polymers Difficult to Find – And Difficult to Verify

Bioethics symposium: a scientist's guide to approaching bioethics.

The Bioethics Symposium titled “A scientist’s guide to approaching bioethics” was held at the joint annual meeting of the American Society of Animal Science, American Dairy Science Association, and the Canadian Society of Animal Science in Montreal, Quebec, Canada, July 12 to 16, 2009. The purpose of the symposium was to help animal scientists come to terms with the importance of grappling with...