The fourth hijacked plane was crashed into the Pentagon in Arlington, Virginia, killing almost 200 military and civilian personnel. One law enforcement officer, who was a passenger on the plane, was killed in that crash. Seventy-one law enforcement officers, 343 members of the New York City Fire Department, and over 2,800 civilians were killed at the World Trade Center site on 9/11.Ī third hijacked plane crashed into a field in rural Pennsylvania when the passengers attempted to re-take control of the plane. The North Tower collapsed a short time later. Due to their quick actions, it is estimated that over 25,000 people were saved.Īs the evacuation continued, the South Tower unexpectedly collapsed as a result of the intense fire caused by the impact. On the morning of September 11th, 2001, seventy-two officers from a total of eight local, state, and federal agencies were killed when terrorist hijackers working for the al Qaeda terrorist network, headed by Osama bin Laden, crashed four hijacked planes into the World Trade Center towers in New York City, the Pentagon in Arlington, Virginia, and a field near Shanksville, Pennsylvania.Īfter the impact of the first plane into the World Trade Center's North Tower, putting the safety of others before their own, law enforcement officers along with fire and EMS personnel, rushed to the burning Twin Towers of the World Trade Center to aid the victims and lead them to safety. He is survived by his wife and three children. On May 13, 2007, Detective Williamson died as a result of his work at Ground Zero.ĭetective Williamson served with the New York City Police Department for 20 years and was assigned to the Street Crime Unit. During the subsequent years, his pancreas, spleen, gallbladder, most of his stomach, and parts of his intestines and lungs became cancerous. The inhalation of those chemicals led to the development of cancer. While he was working at the site, World Trade Center building 7 collapsed, but Detective Williamson was able to escape unharmed.ĭuring the following months, Detective Williamson worked hundreds of hours at the Ground Zero site, where he inhaled toxic chemicals and materials. " - "Coming from the other end, the main argument for non-convexity is that a convex formulation very often fails to capture fundamental properties of a real problem (e.g.Detective Robert Williamson died of pancreatic and lung cancer he developed as a result of his work at Ground Zero, the site of the World Trade Center terrorist attack of 9/11.ĭetective Williamson responded to the World Trade Center on September 11, 2001, shortly after the two towers had collapsed. " - "Interestingly, (Long and Servedio, 2010) established a lower bound against potential-based convex boosting techniques in the presence of RCN." - "However, it was shown in 2010) that any convex potential booster can be easily defeated by a very small amount of label noise" - "A major roadblock one has to get around in label noise algorithms is the non-robustness of linear classifiers from convex potentials as given in. " - "Moreover, in the case of boosting, it has been shown that convex boosters are necessarily sensitive to noise (Long and Servedio 2010 " - "Ostensibly, this result establishes that convex losses are not robust to symmetric label noise, and motivates using non-convex losses. " "This is as opposed to most boosting algorithms that are highly susceptible to outliers.
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