Rank

High-frequency keywords

Frequency of occurrence

First year

Rank

Highly Centralized Keywords

Centrality

First year

1

Research evaluation

188

1998

1

Research evaluation

0.45

1998

2

Technology Evaluation

111

2001

2

Technology Evaluation

0.42

2001

3

Science and S& T Assessment t

56

1999

3

S& T Assessment

0.18

1999

4

h index

14

2009

4

SCI

0.14

2002

5

Bibliometrics

9

2008

5

Academic evaluation

0.13

2014

6

Colleges

7

2007

6

Colleges

0.10

2007

7

Academic journals

5

2010

7

regression analysis

0.08

2010

8

Technology Management

5

2006

8

Impact factor

0.06

2003

9

Peer review

4

2011

9

Bibliometrics

0.05

2008

10

Impact factor

4

2003

10

Scientific Paper Index

0.05

2003