Presentation at the 17th Dutch-Belgian Information Retrieval workshop (DIR2018). Leiden, the Netherlands, November 23, 2018.

1. Scientific information retrieval:
Challenges and opportunities
Ludo Waltman
Centre for Science and Technology Studies (CWTS), Leiden University
17th Dutch-Belgian Information Retrieval Workshop (DIR2018)
Leiden, The Netherlands
November 23, 2018

2. Centre for Science and Technology Studies (CWTS),
Leiden University
• Quantitative science studies
• Bibliometrics and scientometrics
• Research management and science policy
• Lots of commissioned research for research
institutions, funders, governments, companies, etc.
1

3. Information retrieval vs. scientometrics
2
Scientific
document
retrieval
Web page
retrieval
Image
retrieval
...
Sciento-
metric
analysis
Sciento-
metrics
Information
retrieval
Sound
retrieval
Individual
users
Research
managers
Policy makers
Researchers

4. Outline
• Historical connections between information retrieval and scientometrics
• Scientometric perspective on information retrieval
• Scientific information retrieval
3

5. Historical connections
between information
retrieval and
scientometrics
4

6. Author co-citation analysis of information science
researchers (1980–1987)
5
White and McCain (1998)
Scientometrics Information
retrieval

7. Author bibliographic coupling analysis of information
science researchers (2001–2005)
6
Zhao and Strotmann (2008)
Scientometrics
Information
retrieval

8. PageRank
7Brin and Page (1998) Pinski and Narin (1976)

9. PageRank
8

10. Scientometric
perspective on
information retrieval
9

11. VOSviewer
10

12. Identifying micro-level fields of science
• Based on all articles in reviews in Web of Science between 2000 and 2017
• 21.2 million publications
• 374.1 million citation links
• Clustering of publications into about 4000 micro-level fields of science using
the Leiden algorithm
11

13. Leiden algorithm
12
Traag et al. (2018)

14. Structure of science based on 4000 micro-level fields
13
Social sciences
and humanities
Biomedical and
health sciences
Life and earth
sciences
Mathematics and
computer science
Physical sciences
and engineering
Size of a field is proportional
to the number of publications
in the field

15. Temporal dynamics in micro-level structure of science
14
Social sciences
and humanities
Biomedical and
health sciences
Life and earth
sciences
Mathematics and
computer science
Physical sciences
and engineering
Network science
Electric vehicles
Image processing
Multi-agent systems
Average publication year of
the publications in a field

16. Position of scientometrics in micro-level structure of
science
15
Proportion of publications with
‘bibliometrics’ or
‘scientometrics’ in title or
abstract
Social sciences
and humanities
Biomedical and
health sciences
Life and earth
sciences
Mathematics and
computer science
Physical sciences
and engineering
Scientometrics

17. Position of information retrieval in micro-level structure
of science
• What are the main subfields of information retrieval?
• Which broad scientific disciplines do these subfields relate to?
• Which are the main developments in information retrieval in recent years?
16

18. Position of information retrieval in micro-level structure
of science
17
Proportion of publications with
‘information retrieval’ in title or
abstract
Social sciences
and humanities
Biomedical and
health sciences
Life and earth
sciences
Mathematics and
computer science
Physical sciences
and engineering
IR subfield 2
Scientometrics
IR subfield 1
IR subfield 3

19. Term map of information retrieval subfield 1
18
Average publication year of
the publications in which a
term occurs
Size of a term is proportional
to the number of publications
in which the term occurs

20. Term map of information retrieval subfield 2
19

21. Term map of information retrieval subfield 3
20

22. Information retrieval subfields
• Subfield 1:
– Computer science perspective: ‘Hard’ information retrieval
– Strong recent emphasis on recommender systems, social media, and sentiment analysis
• Subfield 2:
– Information science perspective: ‘Soft’ information retrieval
– Connections between information retrieval, library science, and information behavior and
information literacy research
• Subfield 3:
– Bioinformatics perspective: Information retrieval in the biomedical and health science domain
• These subfields do not exhaustively cover all information retrieval research
21

23. Term map of scientometrics field
22

24. Term map of scientometrics field
23
Proportion of publications with
‘information retrieval’ in title or
abstract

25. Workshops on bibliometric-enhanced information
retrieval
24

26. Scientific information
retrieval
25

27. Tools for scientific information retrieval
26

28. Google Scholar
27

29. Web of Science
28

30. Web of Science
29

31. Approaches in scientific information retrieval
• Semantic search
• Similar articles
• Advanced full-text search
• Clustering
• Highly influential citations
• Citation-based expansion
30

32. Semantic search (Microsoft Academic)
31

33. Identifying fields of study (Microsoft Academic)
32Shen et al. (2018)

34. Similar articles (PubMed)
33

35. Similar articles (PubMed)
34
Lin and Wilbur (2007)

36. Advanced full-text search (Europe PMC)
35

37. Clustering (Open Knowledge Maps)
36

38. Clustering (Open Knowledge Maps)
37

39. Clustering (ongoing work)
38

40. In-text references
39
Boyack et al. (2018)

41. 40
Highly influential citations (Semantic Scholar)

42. Highly influential citations (Semantic Scholar)
41
Valenzuela et al. (2015)

43. Citation-based expansion (CitNetExplorer)
42
Van Eck and Waltman (2014)
Expansion with all citing
and cited publications
Expansion with citing and
cited publications having 3
or more citation links
Selection of publications
(in blue)

44. Citation-based expansion (CitNetExplorer)
43

45. Citation-based expansion (CitNetExplorer)
44

46. Literature reviewing using citation-based expansion
45

47. Open citations
46
Shotton (2018)

48. Open citations
47

49. Citation-based expansion (Citation Gecko)
48

50. Conclusions
• Significant inefficiencies in current information retrieval practices of
researchers
• Lots of room for innovation
• Take advantage of open science developments
• Join forces between information retrieval and scientometrics
49

51. Workshop on Bibliometric-enhanced Information
Retrieval at ECIR 2019
50

52. Thank you for your attention!
51

53. References
Boyack, K.W., Van Eck, N.J., Colavizza, G., & Waltman, L. (2018). Characterizing in-text citations in scientific articles: A large-scale analysis. Journal of Informetrics, 12(1),
59–73.
Brin, S., & Page, L. (1998). The anatomy of a large-scale hypertextual web search engine. Computer Networks and ISDN Systems, 30(1–7), 107–117.
Lin, J., & Wilbur, W.J. (2007). PubMed related articles: A probabilistic topic-based model for content similarity. BMC Bioinformatics, 8(1), 423.
Pinski, G., & Narin, F. (1976). Citation influence for journal aggregates of scientific publications: Theory, with application to the literature of physics. Information Processing &
Management, 12(5), 297–312.
Shen, Z., Ma, H., & Wang, K. (2018). A Web-scale system for scientific knowledge exploration. arXiv:1805.12216.
Shotton, D. (2018). Funders should mandate open citations. Nature, 553, 129.
Traag, V.A., Waltman, L., & Van Eck, N.J. (2018). From Louvain to Leiden: Guaranteeing well-connected communities. arXiv:1810.08473.
Valenzuela, M., Ha, V., & Etzioni, O. (2015). Identifying meaningful citations. AAAI Workshop: Scholarly Big Data.
Van Eck, N.J., & Waltman, L. (2010). Software survey: VOSviewer, a computer program for bibliometric mapping. Scientometrics, 84(2), 523–538.
Van Eck, N.J., & Waltman, L. (2014). CitNetExplorer: A new software tool for analyzing and visualizing citation networks. Journal of Informetrics, 8(4), 802–823.
Waltman, L., & Van Eck, N.J. (2012). A new methodology for constructing a publication-level classification system of science. JASIST, 63(12), 2378–2392.
White, H.D., & McCain, K.W. (1998). Visualizing a discipline: An author co‐citation analysis of information science, 1972–1995. JASIS, 49(4), 327–355.
Zhao, D., & Strotmann, A. (2008). Evolution of research activities and intellectual influences in information science 1996–2005: Introducing author bibliographic-coupling
analysis. JASIST, 59(13), 2070–2086.
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