CNN News: Text summarization by the KPC method length; F1: threshold = 14 words; values: 0=short, 1=long paragraph; F2: values: i=first, f=last, m=medial thematic-words; F3: thematic words: attack, Internet, 13, traffic, servers, said, officials, failed, computers, against, FBI; score (nr of thematic words in the sentence) > 3 is high; values: 0=high score, 1=low score 1. (summary) Nine of the 13 computer servers that manage global Internet traffic were crippled by a powerful electronic attack this week, officials said. F1(s1)=1; F2(s1)=i; F3(s1)=0 (8 thematic words) 2. (non-summary) But most Internet users didn't notice because the attack only lasted an hour. F1(s2)=0; F2(s2)=m; F3(s2)=1 (2 thematic words) 3. (n) Its origin was not known, and the FBI and White House were investigating. F1(s3)=0; F2(s3)=m; F3(s3)=1 4. (n) One official described Monday's attack as the most sophisticated and large-scale assault against these crucial computers in the history of the Internet. F1(s4)=1; F2(s4)=f; F3(s4)=0 (4 thematic words) * 5. (su) Seven of the 13 servers failed to respond to legitimate network traffic and two others failed intermittently during the attack, officials confirmed. F1(s5)=1; F2(s5)=i; F3(s5)=0 (7 thematic words) 6. (n) The FBI's National Infrastructure Protection Center was "aware of the denial of service attack and is addressing this matter," spokesman Steven Berry said. F1(s6)=1; F2(s6)=m; F3(s6)=1 (3 thematic words) 7. (su) Service was restored after experts enacted defensive measures and the attack suddenly stopped. F1(s7)=0; F2(s7)=f; F3(s7)=1 (1 thematic word) * 8. (n) The 13 computers are spread geographically across the globe as precaution against physical disasters and operated by U.S. government agencies, universities, corporations and private organizations. F1(s8)=1; F2(s8)=i; F3(s8)=1 (2 thematic words) 9. (n) "As best we can tell, no user noticed and the attack was dealt with and life goes on," said Louis Touton, vice president for the Internet Corporation for Assigned Names and Numbers, the Internet's key governing body. F1(s9)=1; F2(s9)=f; F3(s9)=1 (3 thematic words) 9 sentences S = 3 summary sentences (marked-up with 'su'), 6 non-summary sentences ('n') P1(0) = P(F1(s)=0) = 3/9 = 1/3 P1(1) = 6/9 = 2/3 P1(0 | s belongs to S) = 1/3 P1(1 | s belongs to S) = 2/3 P2(i) = 3/9 = 1/3 P2(f) = 3/9 = 1/3 P2(m) = 3/9 = 1/3 P2(i | s belongs to S) = 2/3 P2(f | s belongs to S) = 1/3 P2(m | s belongs to S) = 0/3 P3(0) = 3/9 = 1/3 P3(1) = 6/9 = 2/3 P3(0 | s belongs to S) = 2/3 P3(1 | s belongs to S) = 1/3 P(s belongs to S) = 3/9 = 1/3 --------------------------------------------------------------------- A new document to summarize: Summarization: 1) for each sentence: find values for the features calculate the probability to be a summary sentence 3) Choose n best-scoring sentences. Thematic words: hostages, building, Russian, rebels, killed, before, forces, end, Vasilyev, Russia, Chechen 11. Russian officials say 36 of the Chechen hostage-takers were killed early Saturday after Russian forces stormed the building where the rebels were holding some 700 hostages. F1(s11)=1; F2(s11)=i; F3(s11)=0 P(s belongs to S | 1,i,0)? P1(1 | s belongs to S) * P2(i | s belongs to S) * P3(0 | s belongs to S) * P(s belongs to S) / P1(1)*P2(i)*P3(0) = 2/3 * 2/3 * 2/3 * 1/3 ---------------------- = 2/3 2/3 * 2/3 * 1/3 12. Some of the Chechen captors may have escaped, according to Russia's deputy interior minister, Vladimir Vasilyev. 13. It is still not clear how many hostages were killed or injured in the ordeal. 14. Russia's Interfax reported two of the hostages were killed in the hours before the activity intensified, and two others -- a woman and man -- suffered head injuries, a rescue official told the news agency. 15. Vasilyev said the Russian forces were able to save many lives by preventing the explosion of the building. * ...