In querying GDBs, RPQs are of user importance.
By analyzing the proposed local centrality and closeness degree between users, user importance between users from the same and different fog community can be evaluated.
Therefore, the closeness degree which describes the encounter frequency between two users with different fog community is used for user importance of different fog community.
Section 5 describes the user importance perceiving mechanism, whereas a social and physical attribute cooperatively perceiving D2D data forwarding mechanism is introduced in Section 6.
Because users from the same fog community are all socially close, the local centrality which describes the relationship among users within the same fog community will be used for user importance of same fog community, while the relationship of users from the different fog community is not all closed.
A user importance evaluation method is proposed in this paper to estimate the local centrality and closeness degree of users, which indicate the horizontal social relationship, namely the intra-community social relationship, and vertical social relationship, namely inter-community social relationship.
In the second stage, the costs of FM services in two comparable estates and the users' perceived importance and performance of the services were collected.
To ensure uninterrupted supply of electricity to its end users, critical importance is given to maintenance work of equipment like pumps, fans, boilers, condenser tubes, turbine blades etc. by the management.
Focusing on typical public and private high-rise residential buildings in Hong Kong, users' perceived importance of four key attributes, namely thermal comfort, air cleanliness, odour and noise, and their perceived performance of the buildings in these attributes were studied.
