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Assessing the Impact of Jeff D. Ullman

Assessing the Impact of Jeff D. Ullman. Peter P. Chen Computer Science Dept Louisiana State University Pchen@lsu.edu , www.csc.lsu.edu/~chen (Presented at Ullman’s Retirement Symposium, Stanford Univ., Dec. 6, 2002). Outline. How to assess the impact of a scientist?

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Assessing the Impact of Jeff D. Ullman

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  1. Assessing the Impact of Jeff D. Ullman Peter P. Chen Computer Science Dept Louisiana State University Pchen@lsu.edu,www.csc.lsu.edu/~chen (Presented at Ullman’s 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 JDU’s 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 Ullman’s 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 Ullman’s 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 JDU’s 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 Ullman’s Publications • Out of 629, 254 authors in the CiteSeer DB • Jeff is ranked as No. 2 • The total number of citations of all Jeff’s publications is: 10592

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

  13. How many JDU’s publications are ranked in the top 200? • 12.   DocContext1455   [4] John Hopcroft and Jeffrey Ullman. Introduction to Automata Theory, Languages, and Computation. Addison Wesley, 1979. • 21.   BookContext1171   [2] A.V. Aho, J.E. Hopcroft, and J.D. Ullman, The Design and Analysis of Computer Algorithms, Addison-Wesley, Reading, MA, 1974. • 26.   BookContext1107   [1] A.V. Aho, R. Sethi, and J.D. Ullman, Compilers: Principles, Techniques, and Tools., Addison-Wesley, 1986.  • 42.   DocContext849   [Ull88] Ullman J. D.: Principles of Database and Knowledge-Base Systems, Volumes 1 and 2. Computer Science Press, 1988. • 66.   DocContext635   [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 • Jeff’s 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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