Japan's NTT DoCoMo said Thursday that it plans to buy 16 percent of AT&T Wireless Group for $9.8 billion. Under the deal, AT&T Wireless (T) will set up a wholly owned subsidiary to produce multimedia applications for its current network, by importing technology used in DoCoMo's "i-mode" Internet-ready phones. DoCoMo will also take a 20 percent stake in Taiwan's third-largest mobile carrier KG Telecom for 59.8 billion yen. - - - Dot-com job blues: According to a new report by the recruitment firm Challenger, Gray and Christmas, chief executive departures rose 59 percent in November to 111, led by the dot-com sector. Twenty-six dot-com company CEOs got the ax in November, making it the fourth consecutive month that dot-com companies led the technology industry for the most CEO departures.