To express integrated optimization of multiple hubs location and mixednetwork design, a bi-level programming model was introduced for mathematical models.
为了描述多枢纽选址与混合网络设计综合优化问题，引入了双层规划模型建立数学模型。
2
On the other side, hacker attack, virus spreading and mixednetwork attacks add increasingly, so that the network security defensive line is full frailness.
另一方面，黑客攻击、病毒传播以及形形色色的网络攻击日益增加，网络安全防线十分脆弱。
3
Mixed networks: There are a number of social networks that have a subscription of people from all the above groups and is a heterogeneous social network serving multiple types of social collaboration.