PMC

The underlying network of the multilayer network model is a physical device network in which routers are connected to each other through connectivity relationships (red undirected links) and routers are connected to servers or end nodes through routing control relationships (red directed links). The middle layer network is a business application network in which business system nodes are connected to business system nodes through business association relationships, while business systems are connected to access. The upper layer network is a user role network based on business system association relationships, where users are connected by social association relationships (yellow undirected links). The physical device network is linked to the business application network by unidirectional interdependencies (green directed dashed links). There are two types of connections between the business application network and the user role layer; business system nodes and user nodes are connected by unidirectional interdependency links (purple directed dashed links), and access nodes and user nodes are connected by login association relationships (blue undirected dashed links). The node disturbance simulation process is as follows: (a) Initially, it destroys a routing node in the physical device network, causing the router to go out of service (indicated by a black routing node). (b) Because the destroyed routing node fails, the routing node with the largest component that has access to the network through that node also fails, which in turn causes the servers and endpoints controlled by its routing to be disabled (indicated by the black server node and the black endpoint node). (c) Loss of server node and terminal node support at the physical device layer, failure of associated business system nodes and access nodes within the business application layer (represented by black business nodes and black access nodes), and consequently failure of associated user roles within the user role layer (represented by black user nodes).

Gas Supply System Risk Heatmap Monitoring. Please note that the business users are usually distributed along the street and here we only draw the gas supply system risk for every business user.

Business logic flow chart of the user management module ((a) business logic of registration function; (b) business logic of login function; (c) business logic of modifying personal information function).

Standard window capture, steps 2–11 of the diagnosis, in which the user must indicate the priority level for each business area. The priority level goes from no interest to high interest.