Fig 1.
Comprehensive evaluation index system of TPGU.
Fig 2.
Diagram of Euclidean distance and Mahalanobis distance.
(a) Euclidean distance. (b) Mahalanobis distance.
Fig 3.
The mechanism of improved TOPSIS and grey relational analysis model.
Table 1.
The weight of TPGU comprehensive evaluation index.
Table 2.
Positive and negative ideal solution.
Table 3.
Relational coefficient matrix.
Table 4.
Mahalanobis distance from each TPGU to the positive and negative ideal solutions.
Table 5.
Grey correlation degree.
Table 6.
Dimensionless processing.
Table 7.
The proximity of ideal solution.
Table 8.
The relative closeness degree.
Fig 4.
Evaluation results of second-level index.
Fig 5.
The TPGU ranking sequence trend.
Table 9.
The relative closeness degree based on α and β from 0 to 1.
Fig 6.
Radar chart for the three methods.
Table 10.
Final result data for the three methods.
Table 11.
The SWOT analysis of TPGU.