1 Subjects: “...digital twins...”

2 Subjects: “...coordinated multimodal service...”

3 Subjects: “...IT services catalog...”

4 Subjects: “...surface vehicle...”

5 Subjects: “...surface thermal environment...”

6 Subjects: “...social distancing...”

7 Subjects: “...Social Life Cycle Analysis...”

8 Subjects: “...life-cycle social analysis...”

9 Subjects: “...social networks...”

10 Subjects: “...response surface method...”

11 Subjects: “...service robot...”

12 Subjects: “...service robot...”

13 Subjects: “...service robot...”