1105 Media Inc., a Chatsworth based publishing company, has agreed to acquire Post Newsweek Tech Media, the government publishing and events group of The Washington Post Co. Terms of the transaction were not disclosed. The Post Newsweek group publishes Government Computer News, Washington Technology, Government Leader, Defense Systems and other online products as well as the FOSE trade show. The acquisition will give 1105 Media a subscriber base of 240,000 government readers, the company said.