In the most recent incident, the Journal was notified by the FBI of a potential breach in the middle of last year, when the FBI came across data that apparently had come from the computer network in the Journal's Beijing bureau, people familiar with the incident said.
The probe watched where the hackers went within the Journal's computer networks, what information they were interested in and how deeply they had penetrated.
According to a posting on the Journal's Web site, editors at the world's top medical journal found by examining a computer diskette that relevant data about Vioxx's risk to the heart compared with an older pain drug, naproxen, were deleted two days before the paper was initially submitted to the Journal.
Ben Edelman, an assistant professor at Harvard Business School who studies Internet advertising, reviewed the computer code on the seven sites at the request of the Journal.
Media outlets including The New York Times, The Wall Street Journal and The Washington Post have all said this year that their computer systems were breached, while several NBC websites were briefly hacked in November.
The online attack comes on the heels of recent hacks into the computer systems of U.S. media and technology companies, including The New York Times and The Wall Street Journal.
The Journal in February reported that Google was using special computer code to install tiny tracking files, or "cookies, " on some people's computers, iPhones and iPads, even if the devices were set to block this kind of tracking.
He is a consulting professor of Computer Science at Stanford University and editor-in-chief of the Journal of the Association of Computing Machinery.
For the first time, an organism whose genetic code was created on a computer is multiplying in a lab, researchers reported on the website of the journal Science.
Staffers at the Wall Street Journal got a taste of that world recently when they suffered a computer glitch that completely knocked out access to e-mail and the Web.
The other manager, Noah Freeman, recorded Mr. Longueuil describing how he destroyed external computer drives in a panic after reading a Wall Street Journal article detailing the government's investigation, according to a criminal complaint against Mr. Longueuil.
He was arrested in 2011 and charged in a scheme in which he allegedly logged into the computer network at the Massachusetts Institute of Technology and using it to download millions of academic journal articles from a database called JSTOR, owned by a nonprofit group.
Robert Coben, a neuropsychologist on Long Island, has recently published in the peer-reviewed Journal of Neurotherapy a study of autistic children who, by playing special computer games, have improved connections among neurons in the frontal and temporal lobes, resulting in fewer repetitive behaviors, better socialization and improved language skills.
Swartz was portrayed by prosecutors as a computer hacker who had wrongfully accessed some free documents from an on-line academic journal repository at the Massachusetts Institute of Technology (MIT).
Despite repeated opposition claims that small business will bear a heavy burden as a result of the Affordable Care Act, a study published this week in the New England Journal of Medicine conducted by the non-partisan, non-profit Rand Corporation and based on sophisticated computer modeling, reveals something quite to the contrary.
FORBES: Small business projected to be big winner in healthcare reform
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