Abstract: Database normalization is a ubiquitous theoretical relational database analysis process. It comprises several levels of normal forms and encourage database designers not to split database ...

Normalization of medical concepts to an ontology is a key aspect of the natural language processing of biomedical text. It enables the mapping of medical expressions to standardized ontology terms and ...

The cover of Adam Higginbotham's "Challenger: A True Story of Heroism and Disaster on the Edge of Space" Credit: Simon and Schuster Sign up for the Concord Monitor’s morning newsletter for essential ...

How many times does a single event define a decade all by itself? In recent memory, it’s only really happened a couple of times, once on September 11th, 2001, and once more precisely 40 years to this ...

Bob Ebeling was anxious and angry as he drove to work on the morning of Jan. 28, 1986. He kept thinking about the space shuttle Challenger, cradled on a Florida launchpad 2,000 miles away. Ebeling ...

This year marks the 40th anniversary of the Challenger explosion, which occurred 73 seconds after liftoff on Jan. 28, 1986, killing all seven astronauts. Investigators blamed cold-weather O-ring ...

NASA Administrator Jared Isaacman, left, speaks with, second from left to right, former NASA Administrators Bill Nelson, Charles Bolden, and Sean O'Keefe following a wreath laying ceremony as part of ...

Add Yahoo as a preferred source to see more of our stories on Google. This year marks the 40th anniversary of the Challenger explosion, which occurred 73 seconds after liftoff on Jan. 28, 1986, ...

The lefthand side of the mission control room at the Johnson Space Center displays the badges of Apollo 1, Challenger and Columbia. Credit: NASA / Courtesy Sign up for the Concord Monitor’s morning ...

Forty years after the Challenger disaster, NPR explores the engineers' last-minute efforts to stop the launch, their decades of guilt and the... 40 years after Challenger: Lingering guilt and lessons ...