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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Computer Science 54 4565 4436 2135 2060 400 11675

Oscar H. Ibarra publications per year

The chart shows the history of publications by Oscar H. Ibarra between 1967 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Oscar H. Ibarra published across 59 years, from 1967 to 2025, averaging 7 papers a year. Output peaked at 19 publications in 2006. 10 of the 414 publications appeared in the last two years.

No. of publications
5 10 15
Bar chart. Horizontal axis: year, 1967 to 2025. Vertical axis: number of publications, 0 to 19. Peak 19 publications in 2006. 1967: 2 publications 1968: 1 publication 1969: 0 publications 1970: 2 publications 1971: 2 publications 1972: 1 publication 1973: 2 publications 1974: 3 publications 1975: 5 publications 1976: 2 publications 1977: 3 publications 1978: 4 publications 1979: 6 publications 1980: 3 publications 1981: 10 publications 1982: 8 publications 1983: 9 publications 1984: 6 publications 1985: 7 publications 1986: 8 publications 1987: 8 publications 1988: 13 publications 1989: 6 publications 1990: 6 publications 1991: 11 publications 1992: 6 publications 1993: 10 publications 1994: 8 publications 1995: 4 publications 1996: 7 publications 1997: 7 publications 1998: 5 publications 1999: 3 publications 2000: 12 publications 2001: 9 publications 2002: 13 publications 2003: 15 publications 2004: 17 publications 2005: 15 publications 2006: 19 publications 2007: 11 publications 2008: 13 publications 2009: 14 publications 2010: 11 publications 2011: 6 publications 2012: 10 publications 2013: 5 publications 2014: 11 publications 2015: 5 publications 2016: 7 publications 2017: 6 publications 2018: 9 publications 2019: 6 publications 2020: 1 publication 2021: 4 publications 2022: 2 publications 2023: 5 publications 2024: 6 publications 2025: 4 publications
1967 2025

414 publications in total across all disciplines

View publications per year as a table
Oscar H. Ibarra: publications per year, 1967 to 2025
Year Publications
1967 2
1968 1
1969 0
1970 2
1971 2
1972 1
1973 2
1974 3
1975 5
1976 2
1977 3
1978 4
1979 6
1980 3
1981 10
1982 8
1983 9
1984 6
1985 7
1986 8
1987 8
1988 13
1989 6
1990 6
1991 11
1992 6
1993 10
1994 8
1995 4
1996 7
1997 7
1998 5
1999 3
2000 12
2001 9
2002 13
2003 15
2004 17
2005 15
2006 19
2007 11
2008 13
2009 14
2010 11
2011 6
2012 10
2013 5
2014 11
2015 5
2016 7
2017 6
2018 9
2019 6
2020 1
2021 4
2022 2
2023 5
2024 6
2025 4
Total 414
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Oscar H. Ibarra publication distribution in Computer Science in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Computer Science in 2026. The highlighted bar marks where Oscar H. Ibarra sits on this spectrum.

No. of scientists
200 400 600
Bar chart with 97 bars. Horizontal axis: publications, 32–41 to 991+. Vertical axis: number of scientists, 0 to 609. Most scientists, 609, have 142–151 publications. The last bar groups every scientist with 991 publications or more. The highlighted bar, 392–401 publications, is where this scientist sits. 32–41 publications: 7 scientists 42–51 publications: 22 scientists 52–61 publications: 82 scientists 62–71 publications: 134 scientists 72–81 publications: 249 scientists 82–91 publications: 324 scientists 92–101 publications: 421 scientists 102–111 publications: 420 scientists 112–121 publications: 497 scientists 122–131 publications: 544 scientists 132–141 publications: 555 scientists 142–151 publications: 609 scientists 152–161 publications: 559 scientists 162–171 publications: 534 scientists 172–181 publications: 556 scientists 182–191 publications: 583 scientists 192–201 publications: 519 scientists 202–211 publications: 508 scientists 212–221 publications: 490 scientists 222–231 publications: 437 scientists 232–241 publications: 423 scientists 242–251 publications: 408 scientists 252–261 publications: 377 scientists 262–271 publications: 301 scientists 272–281 publications: 335 scientists 282–291 publications: 320 scientists 292–301 publications: 293 scientists 302–311 publications: 250 scientists 312–321 publications: 238 scientists 322–331 publications: 206 scientists 332–341 publications: 209 scientists 342–351 publications: 208 scientists 352–361 publications: 162 scientists 362–371 publications: 176 scientists 372–381 publications: 127 scientists 382–391 publications: 158 scientists 392–401 publications: 128 scientists 402–411 publications: 104 scientists 412–421 publications: 94 scientists 422–431 publications: 99 scientists 432–441 publications: 83 scientists 442–451 publications: 108 scientists 452–461 publications: 73 scientists 462–471 publications: 77 scientists 472–481 publications: 69 scientists 482–491 publications: 84 scientists 492–501 publications: 62 scientists 502–511 publications: 54 scientists 512–521 publications: 57 scientists 522–531 publications: 51 scientists 532–541 publications: 51 scientists 542–551 publications: 32 scientists 552–561 publications: 38 scientists 562–571 publications: 28 scientists 572–581 publications: 43 scientists 582–591 publications: 33 scientists 592–601 publications: 41 scientists 602–611 publications: 32 scientists 612–621 publications: 28 scientists 622–631 publications: 25 scientists 632–641 publications: 27 scientists 642–651 publications: 17 scientists 652–661 publications: 20 scientists 662–671 publications: 17 scientists 672–681 publications: 15 scientists 682–691 publications: 14 scientists 692–701 publications: 21 scientists 702–711 publications: 13 scientists 712–721 publications: 12 scientists 722–731 publications: 19 scientists 732–741 publications: 14 scientists 742–751 publications: 12 scientists 752–761 publications: 10 scientists 762–771 publications: 10 scientists 772–781 publications: 11 scientists 782–791 publications: 10 scientists 792–801 publications: 11 scientists 802–811 publications: 8 scientists 812–821 publications: 8 scientists 822–831 publications: 7 scientists 832–841 publications: 11 scientists 842–851 publications: 10 scientists 852–861 publications: 5 scientists 862–871 publications: 9 scientists 872–881 publications: 4 scientists 882–891 publications: 6 scientists 892–901 publications: 3 scientists 902–911 publications: 6 scientists 912–921 publications: 3 scientists 922–931 publications: 2 scientists 932–941 publications: 2 scientists 942–951 publications: 2 scientists 952–961 publications: 3 scientists 962–971 publications: 3 scientists 972–981 publications: 3 scientists 982–990 publications: 5 scientists 991+ publications: 100 scientists
32–41 publications 991+

This scientist: 400 publications — 87th percentile

87% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 991 publications or more.

View publications distribution as a table
Number of Computer Science scientists by publication count, Research.com 2026 ranking edition. Based on 14,188 ranked scientists.
Publications Scientists This scientist
32–41 7
42–51 22
52–61 82
62–71 134
72–81 249
82–91 324
92–101 421
102–111 420
112–121 497
122–131 544
132–141 555
142–151 609
152–161 559
162–171 534
172–181 556
182–191 583
192–201 519
202–211 508
212–221 490
222–231 437
232–241 423
242–251 408
252–261 377
262–271 301
272–281 335
282–291 320
292–301 293
302–311 250
312–321 238
322–331 206
332–341 209
342–351 208
352–361 162
362–371 176
372–381 127
382–391 158
392–401 128 400
402–411 104
412–421 94
422–431 99
432–441 83
442–451 108
452–461 73
462–471 77
472–481 69
482–491 84
492–501 62
502–511 54
512–521 57
522–531 51
532–541 51
542–551 32
552–561 38
562–571 28
572–581 43
582–591 33
592–601 41
602–611 32
612–621 28
622–631 25
632–641 27
642–651 17
652–661 20
662–671 17
672–681 15
682–691 14
692–701 21
702–711 13
712–721 12
722–731 19
732–741 14
742–751 12
752–761 10
762–771 10
772–781 11
782–791 10
792–801 11
802–811 8
812–821 8
822–831 7
832–841 11
842–851 10
852–861 5
862–871 9
872–881 4
882–891 6
892–901 3
902–911 6
912–921 3
922–931 2
932–941 2
942–951 2
952–961 3
962–971 3
972–981 3
982–990 5
991+ 100
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Oscar H. Ibarra D-index placement in Computer Science in 2026

The chart shows the D-index (discipline H-index) distribution of Computer Science scientists ranked by Research.com in 2026. The highlighted bar marks where Oscar H. Ibarra sits on this spectrum.

No. of scientists
200 400 600 800
Bar chart with 52 bars. Horizontal axis: D-Index, 30–31 to 131+. Vertical axis: number of scientists, 0 to 990. Most scientists, 990, have 36–37 D-Index. The last bar groups every scientist with 131 D-Index or more. The highlighted bar, 54–55 D-Index, is where this scientist sits. 30–31 D-Index: 879 scientists 32–33 D-Index: 983 scientists 34–35 D-Index: 918 scientists 36–37 D-Index: 990 scientists 38–39 D-Index: 968 scientists 40–41 D-Index: 907 scientists 42–43 D-Index: 821 scientists 44–45 D-Index: 763 scientists 46–47 D-Index: 689 scientists 48–49 D-Index: 543 scientists 50–51 D-Index: 543 scientists 52–53 D-Index: 518 scientists 54–55 D-Index: 500 scientists 56–57 D-Index: 458 scientists 58–59 D-Index: 400 scientists 60–61 D-Index: 337 scientists 62–63 D-Index: 308 scientists 64–65 D-Index: 292 scientists 66–67 D-Index: 249 scientists 68–69 D-Index: 213 scientists 70–71 D-Index: 192 scientists 72–73 D-Index: 189 scientists 74–75 D-Index: 165 scientists 76–77 D-Index: 139 scientists 78–79 D-Index: 119 scientists 80–81 D-Index: 121 scientists 82–83 D-Index: 113 scientists 84–85 D-Index: 88 scientists 86–87 D-Index: 87 scientists 88–89 D-Index: 75 scientists 90–91 D-Index: 69 scientists 92–93 D-Index: 57 scientists 94–95 D-Index: 46 scientists 96–97 D-Index: 38 scientists 98–99 D-Index: 34 scientists 100–101 D-Index: 36 scientists 102–103 D-Index: 27 scientists 104–105 D-Index: 37 scientists 106–107 D-Index: 18 scientists 108–109 D-Index: 31 scientists 110–111 D-Index: 19 scientists 112–113 D-Index: 16 scientists 114–115 D-Index: 12 scientists 116–117 D-Index: 20 scientists 118–119 D-Index: 15 scientists 120–121 D-Index: 5 scientists 122–123 D-Index: 20 scientists 124–125 D-Index: 8 scientists 126–127 D-Index: 5 scientists 128–129 D-Index: 7 scientists 130 D-Index: 3 scientists 131+ D-Index: 98 scientists
30–31 D-Index 131+

This scientist: 54 D-Index — 69th percentile

69% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 131 D-Index or more.

View D-Index distribution as a table
Number of Computer Science scientists by D-index, Research.com 2026 ranking edition. Based on 14,188 ranked scientists.
D-Index Scientists This scientist
30–31 879
32–33 983
34–35 918
36–37 990
38–39 968
40–41 907
42–43 821
44–45 763
46–47 689
48–49 543
50–51 543
52–53 518
54–55 500 54
56–57 458
58–59 400
60–61 337
62–63 308
64–65 292
66–67 249
68–69 213
70–71 192
72–73 189
74–75 165
76–77 139
78–79 119
80–81 121
82–83 113
84–85 88
86–87 87
88–89 75
90–91 69
92–93 57
94–95 46
96–97 38
98–99 34
100–101 36
102–103 27
104–105 37
106–107 18
108–109 31
110–111 19
112–113 16
114–115 12
116–117 20
118–119 15
120–121 5
122–123 20
124–125 8
126–127 5
128–129 7
130 3
131+ 98
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Research.com Recognitions

  • 2008 - Member of Academia Europaea
  • 1995 - ACM Fellow For contributions to the design and analysis of algorithms, the theory of computation, computational complexity, and parallel computing.
  • 1993 - Fellow of the American Association for the Advancement of Science (AAAS)
  • 1984 - Fellow of John Simon Guggenheim Memorial Foundation

Overview

Óscar H. Ibarra is affiliated with the University of California, Santa Barbara in the United States. Their research spans multiple areas within computer science and biochemistry, genetics, and molecular biology, focusing particularly on computational theory, formal languages, and automata theory.

The main fields of study for Óscar H. Ibarra include:

  • Computer Science
  • Biochemistry, Genetics and Molecular Biology

Within these areas, the scientist's work is concentrated in several subfields:

  • Computational Theory and Mathematics
  • Artificial Intelligence
  • Molecular Biology
  • Industrial and Manufacturing Engineering
  • Control and Systems Engineering

The core topics of research covered by Óscar H. Ibarra comprise:

  • semigroups and automata theory
  • DNA and Biological Computing
  • Logic, programming, and type systems
  • Algorithms and Data Compression
  • Machine Learning and Algorithms
  • Computability, Logic, AI Algorithms
  • Cellular Automata and Applications

Óscar H. Ibarra has published extensively, frequently appearing in the following venues:

  • International Journal of Foundations of Computer Science
  • Information and Computation
  • Theoretical Computer Science
  • SSRN Electronic Journal
  • arXiv (Cornell University)

Recent papers authored by Óscar H. Ibarra include:

  • Semilinearity of Families of Languages, 2020, International Journal of Foundations of Computer Science
  • Generalizations of Checking Stack Automata: Characterizations and Hierarchies, 2021, International Journal of Foundations of Computer Science
  • Space Complexity of Stack Automata Models, 2021, International Journal of Foundations of Computer Science
  • On the complexity of decision problems for some classes of machines and applications, 2023, Information and Computation

Other papers connected to their network of research include:

  • Relationships between bounded languages, counter machines, finite-index grammars, ambiguity, and commutative regularity, 2020, Theoretical Computer Science

The researcher has frequently collaborated with the following co-authors:

  • Ian McQuillan
  • Flavio D'Alessandro
  • Pascal Baumann
  • Moses Ganardi
  • Lia Schütze

Óscar H. Ibarra has received several awards during their career, including:

  • Member of Academia Europaea (2008)
  • ACM Fellow (1995) for contributions to the design and analysis of algorithms, the theory of computation, computational complexity, and parallel computing
  • Fellow of the American Association for the Advancement of Science (AAAS) (1993)
  • Fellow of John Simon Guggenheim Memorial Foundation (1984)

Best Publications

  • Fast Approximation Algorithms for the Knapsack and Sum of Subset Problems

    Oscar H. Ibarra;Chul E. Kim

  • Heuristic Algorithms for Scheduling Independent Tasks on Nonidentical Processors

    Oscar H. Ibarra;Chul E. Kim

  • Reversal-Bounded Multicounter Machines and Their Decision Problems

    Oscar H. Ibarra

  • Polynomially Complete Fault Detection Problems

    O.H. Ibarra;S.K. Sahni

  • Bounds for LPT Schedules on Uniform Processors

    Teofilo F. Gonzalez;Oscar H. Ibarra;Sartaj Sahni

  • SWEB: towards a scalable World Wide Web server on multicomputers

    D. Andresen;Tao Yang;V. Holmedahl;O.H. Ibarra

  • Asynchronous spiking neural P systems

    Matteo Cavaliere;Oscar H. Ibarra;Gheorghe Pun;Omer Egecioglu

  • A generalization of the fast LUP matrix decomposition algorithm and applications

    Oscar H Ibarra;Shlomo Moran;Roger Hui

  • The complexity of decision problems for finite-turn multicounter machines

    Eitan M. Gurari;Oscar H. Ibarra

  • Automated composition of e-services: lookaheads

    Çagdaş Evren Gerede;Richard Hull;Oscar H. Ibarra;Jianwen Su

  • Simple matrix languages

    Oscar H. Ibarra

  • Normal forms for spiking neural P systems

    Oscar H. Ibarra;Andrei Pun;Gheorghe Pun;Alfonso Rodríguez-Patón

  • On two-way multihead automata

    Oscar H. Ibarra

  • Probabilistic Algorithms for Deciding Equivalence of Straight-Line Programs

    Oscar H. Ibarra;Shlomo Moran

  • A note on finite-valued and finitely ambiguous transducers

    Eitan M. Gurari;Oscar H. Ibarra

  • Characterizations and computational complexity of systolic trellis automata

    Oscar H. Ibarra;Sam M. Kim

  • Symbolic String Verification: An Automata-Based Approach

    Fang Yu;Tevfik Bultan;Marco Cova;Oscar H. Ibarra

  • Relating the type of ambiguity of finite automata to the succinctness of their representation

    B. Ravikumar;O. H. Ibarra

  • Sequential SNP systems based on min/max spike number

    Oscar H. Ibarra;Andrei Pun;Alfonso Rodríguez-Patón

  • Characterizations of some tape and time complexity classes of turing machines in terms of multihead and auxiliary stack automata

    Oscar H. Ibarra

  • Multi-tape and multi-head pushdown automata

    Michael A. Harrison;Oscar H. Ibarra

Frequent Co-Authors

Jianwen Su
Jianwen Su University of California, Santa Barbara
Tao Jiang
Tao Jiang University of California, Riverside
Tevfik Bultan
Tevfik Bultan University of California, Santa Barbara
Shlomo Moran
Shlomo Moran Technion – Israel Institute of Technology
Richard A. Kemmerer
Richard A. Kemmerer University of California, Santa Barbara
Lila Kari
Lila Kari University of Waterloo
Koji Nakano
Koji Nakano Hiroshima University
Sartaj Sahni
Sartaj Sahni University of Florida
Juhani Karhumäki
Juhani Karhumäki University of Turku
Arto Salomaa
Arto Salomaa Turku Centre for Computer Science

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