honorary doctoral degree for prof. dr. lennart ljung and workshop on system identification and data...

Honorary Doctoral Degree for

Prof. Dr. Lennart Ljung and

Workshop on System Identification and Data Modeling

Wednesday October 12 - 13, 2004Katholieke Universiteit Leuven

Literature Network

Hierarchical text-based clustering of the 138 seed papersDendrogram: all papers clustered into 4 groups

The algorithm was able to separate most of the 13 papers belonging to another ‘Ljung L’.Other important words in the suspicious cluster are uterine, electron microscopy, epithelium, …

The 13 corresponding seed papers were removed from the dataset

Answer to question 5

Hierarchical text-based clustering of the 125 seed papersDendrogram: all papers clustered into 2 groups

Hierarchical text-based clustering of the 125 seed papersDendrogram: all papers clustered into 4 groups

Answer to question 6:

Hierarchical text-based clustering of the 125 seed papersDendrogram: all papers clustered into 6 groups

‘identifiability’ Cluster Term Network (4 papers)

‘architectures’ Cluster Term Network (22 papers)

‘models’ Cluster Term Network (65 papers)

‘transfer functions’ Cluster Term Network (4 papers)

‘convergence’ Cluster Term Network (19 papers)

‘algorithms’ Cluster Term Network (11 papers)

Multidimensional Scaling, 125 papers: 2DDifferent color-symbol combination for each of 6 clusters

Multidimensional Scaling, 125 papersEigenvalues of Y*Y’ (with Y “configuration matrix”)

Multidimensional Scaling, 125 papers: 2DDifferent color-symbol combination for each year of publication

Binning papers using sliding window of 5 years

Number of papers in each 5 year bin:1972-1976: 151973-1977: 191974-1978: 27

1976-1980: 261977-1981: 201978-1982: 191979-1983: 121980-1984: 121981-1985: 191982-1986: 211983-1987: 181984-1988: 181985-1989: 161986-1990: 91987-1991: 81988-1992: 131989-1993: 141990-1994: 17

1991-1995: 221992-1996: 261993-1997: 241994-1998: 231995-1999: 231996-2000: 231997-2001: 221998-2002: 261999-2003: 282000-2004: 25

ALL: 125

1975-1979: 29 Most active period (Q3.1)

Hierarchical text-based clusteringDendrogram: most active period (1975-1979)

one paper per leaf

Hierarchical text-based clusteringDendrogram: most active period (1975-1979)

cut-off at 5 groups

Answer to question 3.2: “adaptive” is least relevant

Multidimensional Scaling, 125 papers: 2DBest term or phrase for each paper published in the indicated 5 year window

Multidimensional Scaling, 125 papers: 2DBest term or phrase for each paper published in the indicated 5 year window

Hierarchical text-based clustering of the citing papersDendrogram: all papers clustered into 20 groups

Term Network for all citing papers

Hierarchical text-based clustering of available cited papersDendrogram: all papers clustered into 20 groups

Term Network for all available cited papers

Hierarchical text-based clustering of Lennart Ljung papersw.r.t. complete 1st degree literature network

Dendrogram: all papers clustered into 20 groups

Term Network for all papers of Lennart Ljungw.r.t. complete 1st degree literature network

Co-authorship network, authors with “Ljung Number 1”

- Total number of co-authors on all papers: 175- “collaboration degree” = 175/125 = 1.4

Answer to question 1.1:- Total number of different co-authors: 77

Citation statistics

- Up till July 2004 Lennart Ljung has been cited 3531 times.- Number of citations per paper in descending order (July 2004) :

- Mean citation rate is 28.2 and the median is 7

Answer to question 2: 500 citations

10 most cited papers according to WoS[times cited]: [authors] - [title]

500: LJUNG L - ANALYSIS OF RECURSIVE STOCHASTIC ALGORITHMS

234: ASTROM KJ, BORISSON U, LJUNG L, WITTENMARK B - THEORY AND APPLICATIONS OF SELF-TUNING REGULATORS

196: LJUNG L - POSITIVE REAL TRANSFER-FUNCTIONS AND CONVERGENCE OF SOME RECURSIVE SCHEMES

178: LJUNG L - ASYMPTOTIC-BEHAVIOR OF THE EXTENDED KALMAN FILTER AS A PARAMETER ESTIMATOR FOR LINEAR-SYSTEMS

173: Sjoberg J, Zhang QH, Ljung L, Benveniste A, Delyon B, Glorennec PY, Hjalmarsson H, Juditsky A - Nonlinear black-box modeling in system identification: A unified overview

128: GUSTAVSSON I, LJUNG L, SODERSTROM T - IDENTIFICATION OF PROCESSES IN CLOSED-LOOP - IDENTIFIABILITY AND ACCURACY ASPECTS

125: SODERSTROM T, LJUNG L, GUSTAVSSON I - THEORETICAL-ANALYSIS OF RECURSIVE IDENTIFICATION METHODS

122: LJUNG L - CONVERGENCE ANALYSIS OF PARAMETRIC IDENTIFICATION METHODS

115: FALCONER DD, LJUNG L - APPLICATION OF FAST KALMAN ESTIMATION TO ADAPTIVE EQUALIZATION

109: LJUNG L, MORF M, FALCONER D - FAST CALCULATION OF GAIN MATRICES FOR RECURSIVE ESTIMATION SCHEMES

Source titles

Answer to question 7

Citation statistics

Citation statistics

Citation statisticsTotal number of citations given to any paper of Lennart Ljung in each year

References in papers of Lennart Ljung

- Lennart Ljung has cited 2732 papers in total in his 125 papers known to WoS- Number of references in descending order:

- The mean number of references is 21.9 and the median is 17

Ljung’s favorite authors [times cited]: [author1, author2,...]

188: LJUNG L63: KAILATH T46: SODERSTROM T29: GUSTAVSSON I24: MORF M22: GUO L20: ASTROM KJ18: YUAN ZD, ANDERSON BDO17: MACCHI O, GOODWIN GC16: HJALMARSSON H, BENVENISTE A, WAHLBERG B, FRIEDLANDER B 15: EWEDA E14: GEVERS M, BITMEAD RR13: GUNNARSSON S, VANDENHOF PMJ, PRIOURET P11: GARDNER WA, LAINIOTI.DG, NINNESS B10: KUSHNER HJ, SCHRAMA RJP, HANNAN EJ9: JUDITSKY A, GLOVER K, BILLINGS SA, STOICA P, DELYON B, SJOBERG J8: DEMOOR B, KOSUT RL, WIDROW B, ZHANG Q, LANDAU ID, AKAIKE H7: CAINES PE, VERHAEGEN M, NARENDRA KS, POOLLA K, GUSTAFSSON F6: WILLEMS JC, HUANG H, GLORENNEC PY, KHARGONEKAR PP, SIDHU GS, BREIMAN L, MCCOOL JM, SARIDIS GN, WITTENMARK B, JOHNSON CR, BERK KN, WITTENMA.B, RISSANEN J, FORSSELL U5: KRAUSE J, MORARI M, STONE CJ, NAGPAL K, JUANG JN, GARULLI A, BEMPORAD A, FARDEN DC, BORISSON U, ISERMANN R, MAREELS MY, NIEDZWIECKI M, VANOVERSCHEE P, KABAILA PV, LARIMORE MG, KHARGONEKAR P, MILANESE M, TIKKU A, LINDQUIST A, DEWILDE P, VICINO A...

Ljung’s favorite authors, excluding co-authors [times cited]: [author1, author2,...]

15: EWEDA E14: BITMEAD RR13: VANDENHOF PMJ11: GARDNER WA, LAINIOTI.DG, NINNESS B10: KUSHNER HJ, SCHRAMA RJP, HANNAN EJ9: BILLINGS SA, STOICA P8: DEMOOR B, KOSUT RL, WIDROW B, LANDAU ID, AKAIKE H7: CAINES PE, NARENDRA KS, POOLLA K6: WILLEMS JC, HUANG H, KHARGONEKAR PP, SIDHU GS, BREIMAN L, MCCOOL JM, SARIDIS GN, JOHNSON CR, BERK KN, WITTENMA.B, RISSANEN J5: KRAUSE J, MORARI M, STONE CJ, NAGPAL K, JUANG JN, FARDEN DC, ISERMANN R, MAREELS IMY, NIEDZWIECKI M, VANOVERSCHEE P, KABAILA PV, LARIMORE MG KHARGONEKAR P, MILANESE M, TIKKU A, LINDQUIST A, DEWILDE P, VICINO A

…

17: MACCHI O, GOODWIN GC: Answer to question 4

Ljung’s favorite papers, excluding own[times cited]: [authors] - [title]

10: KAILATH T - SOME NEW ALGORITHMS FOR RECURSIVE ESTIMATION IN CONSTANT LINEAR-SYSTEMS7: GARDNER WA - NONSTATIONARY LEARNING CHARACTERISTICS OF THE LMS ALGORITHM7: EWEDA E, MACCHI O - TRACKING ERROR-BOUNDS OF ADAPTIVE NONSTATIONARY FILTERING6: MACCHI O, EWEDA E - 2ND-ORDER CONVERGENCE ANALYSIS OF STOCHASTIC ADAPTIVE LINEAR-FILTERING6: BERK KN - CONSISTENT AUTOREGRESSIVE SPECTRAL ESTIMATES6: LAINIOTI.DG - PARTITIONED ESTIMATION ALGORITHMS .2. LINEAR ESTIMATION5: WIDROW B, MCCOOL JM, LARIMORE MG, JOHNSON CR - STATIONARY AND NONSTATIONARY LEARNING CHARACTERISTICS OF LMS ADAPTIVE FILTER5: SARIDIS GN - COMPARISON OF 6 ON-LINE IDENTIFICATION ALGORITHMS5: ASTROM KJ, WITTENMA.B - SELF TUNING REGULATORS5: VANDENHOF PMJ, SCHRAMA RJP - AN INDIRECT METHOD FOR TRANSFER-FUNCTION ESTIMATION FROM CLOSED-LOOP DATA5: POOLLA K, KHARGONEKAR P, TIKKU A, KRAUSE J, NAGPAL K - A TIME-DOMAIN APPROACH TO MODEL VALIDATION4: VERHAEGEN M - IDENTIFICATION OF THE DETERMINISTIC PART OF MIMO STATE-SPACE MODELS GIVEN IN INNOVATIONS FORM FROM INPUT-OUTPUT DATA4: KUSHNER HJ, HUANG H - ASYMPTOTIC PROPERTIES OF STOCHASTIC APPROXIMATIONS WITH CONSTANT-COEFFICIENTS4: ASTROM KJ - MAXIMUM-LIKELIHOOD AND PREDICTION ERROR METHODS…

Global trails

Answer to question 1.2: 4

Other solutions

Answer to question 8: Lennart Ljung was born on SUNDAY September 13th, 1946

Answer to question 9: 2ei i

Contact: frizo.janssens@esat.kuleuven.ac.be

Thank you:Dries Van DrommePatrick Glenisson

Bart De Moor

References

(Biolayout, 2001) A.J. Enright, C.A. Ouzounis, BioLayout JAVA, Bioinformatics, 2001, 17/ 853-854, http://maine.ebi.ac.uk:8000/services/biolayout/

(van Dongen, 2000) van Dongen S., “A cluster algorithm for graphs”, Technical Report INS-R0010, National Research Institute for Mathematics and Computer Science in the Netherlands, Amsterdam, May 2000, http://www.cwi.nl/ftp/CWIreports/INS/INS-R0010.ps.Z