Green Technology Collaboration Network Analysis of China’s Transportation Sector: A Patent-Based Analysis

Table 1

Characteristics of GTTs collaborative network in different stages.

Item	S1 (2007–2010)		S2 (2011–2014)		S3 (2015–2018)
Qty. of nodes	987		1686		1727
B type node	238	24.11%	572	33.93%	680	39.37%
C type node	703	71.23%	1010	59.91%	903	52.29%
U type node	24	2.43%	55	3.26%	71	4.11%
I type node	22	2.23%	49	2.91%	73	4.23%
Qty. of links	876		1769		1822
B lead link	288	32.88%	869	49.12%	939	51.54%
C lead link	489	55.82%	716	40.47%	618	33.92%
U lead link	26	2.97%	48	2.71%	79	4.34%
I lead link	73	8.33%	136	7.69%	186	10.21%
Density	0.001		0.001		0.001
Average degree	0.637		0.657		0.675
Average weighted degree	0.888		1.049		1.055
Diameter	5		5		6
Average clustering coefficient	0.009		0.013		0.009
Average path length	1.1214		1.265		1.97