According to the number of cognitive users, spectrum sensing technology can be divided into single-user spectrum sensing technology and multi-users cooperative spectrum sensing technology.

从参与感知的认知用户数来区分，频谱感知技术可以分为单认知用户频谱感知和多用户协同感知技术。

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The main advantage of FCTM is that users can customize the states and state dependencies of cooperative transactions to reflect the different requirements of CSCW applications.

FCTM的优点在于用户能够根据不同的CSCW应用领域的需求，灵活地定义协同事务的状态和状态依赖。

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Whiteboard is one of important interactive tools based on graphics in Computer Supported Cooperative Work (CSCW). It supports multiple users at different places interact by PCs.

电子白板作为CSCW中的一个重要的图形交互工具，使处于不同地点的用户通过计算机可以实时的进行图形交互。

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Others connect several users with similar interests for larger cooperative projects.

WSJ: Using Wikis and Other Forms of Group Research, Family Historians Are Making Surprising Connections

Wikipedia works on a cooperative model with checks and balances: Each article on the site has its own discussion page, where users debate about edits, additions, new entries and other editorial decisions.

FORBES: The Wikipedia Bureaucracy