Abstract: To address the issue of ignoring the internal relationships of ontology data during the ontology construction process, which leads to problems in extracting implicit concepts and ...

Learn the 3 times table and its division facts with the resources below. You can take a quiz, practise mental arithmetic and learn a 3 times table song. Need to practise your 5 times table? Then look ...

National security, unlocked. Each Thursday, host Mary Louise Kelly and a team of NPR correspondents discuss the biggest national security news of the week. With decades of reporting from battlefields ...

More and more children—at increasingly younger ages—are being immersed in neighborhood violence, even if they don’t make the ...