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Assessing the Impact of Jeff D. Ullman

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How to assess the impact of a scientist? Scope and Limitations of this study ... the help from Dave Maier and Alberto Mendelzon (two great historians) to dig out ... – PowerPoint PPT presentation

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Title: Assessing the Impact of Jeff D. Ullman


1
Assessing the Impact of Jeff D. Ullman
  • Peter P. Chen
  • Computer Science Dept
  • Louisiana State University
  • Pchen_at_lsu.edu, www.csc.lsu.edu/chen
  • (Presented at Ullmans Retirement Symposium,
    Stanford Univ., Dec. 6, 2002)

2
Outline
  • How to assess the impact of a scientist?
  • Scope and Limitations of this study
  • Research Methodology and Tools
  • Research Results
  • Personal Note
  • Conclusions

3
How to Assess the Impact of a Scientist?
  • Usability
  • Actual Implementation, Tested in Real World
  • Number (or Percentage) of Users
  • Citation
  • Number of Citations of the Most Cited Paper
  • Number of Total Citations
  • Research Pioneering Leadership
  • Scope, number of papers, time length,
  • Number of the followers
  • Education Influence
  • Academic Family Tree Productivity and Paper
    Citations of the nodes in the Family Tree
  • Book Leadership

4
Scope of this Study
  • Focusing on Jeff Ullman
  • Many speakers today already discussed the
    Usability and Research Pioneering Activity
    Dimensions, we did not do such study to avoid
    duplication
  • Concentrating on the Paper Citation and Education
    Influence Dimensions (including influence on me)

5
Research Methodology Tools
  • Using Primarily CiteSeer, supplementing with
    other databases and search engines
  • Discovering various problems many data errors,
    inconsistencies
  • Analysis of the Academic Tree posted at JDUs
    home page himself
  • Building an user interface to the database for
    simple queries
  • Comparing with the CS faculty in 5 universities

6
Education Influence of Jeff Ullman
  • Academic Family Tree
  • One of the Largest in Computer Science
  • Probably the largest in DB
  • Productivity and Citation Index of People in the
    Academic Tree
  • One of the Most Productive and Most Cited Group
    of Researchers
  • Book Leadership

7
Analysis of Data of Ullmans Academic Family Tree
  • How many generations?
  • Which generation has most people?
  • And what is the of people?
  • What is the total number of nodes?
  • Which generation is most productive and
    influential (in terms of)?
  • Most number of publications/person
  • Highest average number of citations?
  • Who is the most
  • Productive?
  • Influential?

8
Analysis of Data of Ullmans Academic Family Tree
  • How many generations? 5
  • Which generation has most people? 2nd
  • And what is the of people? 121
  • What is the total number of nodes? 249
  • Which generation is most productive and
    influential (in terms of)?
  • Most number of publications/person? 1st, 18.05
  • Highest average number of citations? 1st, 163.34
  • Who is the most
  • Productive? Howard Siegel, 373
  • Influential? Larry Petterson (1985, 3rd G.)
  • 1684, Student of D. Commer/R. Sethi

9
Comparisons of JDUs Family with CS Depts
  • See separate spreadsheets
  • (Note the spreadsheets are not linked at this
    time. Will be linked in the near future)

10
How is Jeff ranked in the Citation Dimension?
  • CiteSeer maintains two useful statistics
  • Most Cited Author
  • Most Cited Documents (including books and
    articles)
  • Warning
  • CiteSeer data contains a lot of errors
  • However, it is useful as a rough estimate,
    particularly for not very common last names

11
Cumulative Citations of Jeff Ullmans Publications
  • Out of 629, 254 authors in the CiteSeer DB
  • Jeff is ranked as No. 2
  • The total number of citations of all Jeffs
    publications is 10592

12
Individual Publication Citations of Jeff Ullman
  • How many Jeffs publications are ranked in the
    top 200 based on CiteSeer Data as of September
    2002?
  • Answer 5

13
How many JDUs publications are ranked in the top
200?
  • 12.   Doc     Context   1455   4 John Hopcroft
    and Jeffrey Ullman. Introduction to Automata
    Theory, Languages, and Computation. Addison
    Wesley, 1979.
  • 21.   Book   Context   1171   2 A.V. Aho, J.E.
    Hopcroft, and J.D. Ullman, The Design and
    Analysis of Computer Algorithms, Addison-Wesley,
    Reading, MA, 1974.
  • 26.   Book   Context   1107   1 A.V. Aho, R.
    Sethi, and J.D. Ullman, Compilers Principles,
    Techniques, and Tools., Addison-Wesley, 1986. 
  • 42.   Doc     Context   849   Ull88 Ullman J.
    D. Principles of Database and Knowledge-Base
    Systems, Volumes 1 and 2. Computer Science Press,
    1988.
  • 66.   Doc     Context   635   23 A.V. Aho, R.
    Sethi, and J.D Ullman. Compilers Principles,
    Techniques and Tools. March 1988.

14
Book Leadership
  • JDM is the author or co-author of
  • 5 most cited books
  • Many best selling textbooks
  • Usually one of the first textbooks in a
    particular topic/field
  • Model textbooks for other textbook writers to
    follow

15
When did I meet with JDU the First Time?
  • ???
  • Need the help from Dave Maier and Alberto
    Mendelzon (two great historians) to dig out old
    historical data and compare notes.
  • Between 1974 to 1978, there was a DB workshop at
    Bell Lab.
  • JDM was there
  • Al Aho was there, too (?)

16
Reasons Why I am here
  • As a member of DB Community
  • As a person who have been benefited from his book
    leadership
  • Jeffs book on Principles of Database Systems,
    is probably the first book starting with the ER
    Model first
  • Other DB textbooks follow

17
Conclusions (1)
  • JDM has made very significant impact in computer
    science
  • Ranked No. 2 in total citations
  • 5 Most cited books and articles in top-200 cited
    publications
  • Best-Selling Book Author
  • One of the largest and most productive academic
    family tree
  • The DB community (particularly myself) has been
    benefited from JDU
  • Today, we pay tribute to him (to make an acyclic
    graph to a cyclic graph

18
Conclusions (2)
  • The DB community (particularly myself) has been
    benefited from JDU
  • Today, we pay tribute to him (to make an acyclic
    graph to a cyclic graph)

19
Conclusions (3)
  • We are here today to say to one of the greatest
    computer Scientists
  • Dr. Jeff D. Ullman, Thank You!
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