It also reviews the DB2 UDB security model, including user authentication, user and group authorization, and super users.
文中还介绍了DB 2 UDB安全模型，包括用户身份验证、用户和组授权以及超级用户。
Such user mobility can be modeled by a group mobility model where the mobile users are organized into groups of different mobility pattern, mobility rate, and coverage area.
这个可以有组群移动模型模拟操作，模拟出手机用户以不同的形式，速度及覆盖面积的状态。
This group of model users increases the user's score density and reflects the overall evaluation of trends in certain class users.
该组用户增大了类内用户的评分密度，反映了类内用户整体评价趋势。
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