![Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile](https://www.researchgate.net/publication/371152360/figure/fig1/AS:11431281162902378@1685456180076/Example-of-a-DAG-G-drawn-by-our-proposed-framework-left-Same-DAG-drawn-by-the-Sugiyama_Q320.jpg)
Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile
![Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile](https://www.researchgate.net/publication/363501944/figure/fig1/AS:11431281084152502@1663040832311/Example-of-a-DAG-G-drawn-by-our-proposed-framework-left-Same-DAG-drawn-by-the-Sugiyama_Q320.jpg)
Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile
![Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile](https://www.researchgate.net/profile/Ioannis-Tollis/publication/332970916/figure/fig3/AS:757047423426563@1557505579179/shows-two-examples-pointing-out-the-dierence-between-G-c-and-Q-Part-a-shows-a-vertex-u_Q320.jpg)
Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile
![Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile](https://www.researchgate.net/profile/Ioannis-Tollis/publication/335717335/figure/fig2/AS:801574733500428@1568121717983/Path-based-drawing-computed-starting-from-the-graph-represented-in-Figure-5-This-drawing_Q320.jpg)
Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile
![Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile](https://i1.rgstatic.net/ii/profile.image/279480825335815-1443644829536_Q512/Ioannis-Tollis.jpg)
Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile
Graph Drawing: DIMACS International Workshop, GD '94, Princeton, New Jersey, USA, October 10 - 12, 1994. Proceedings | SpringerLink
![Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile](https://www.researchgate.net/profile/Ioannis-Tollis/publication/334735387/figure/fig2/AS:785845225279488@1564371510106/Drawings-of-DAG-1-drawn-with-a-Variant-1-and-b-Variant-2_Q320.jpg)
Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile
![Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile](https://www.researchgate.net/profile/Ioannis-Tollis/publication/298809254/figure/fig4/AS:801249058365446@1568044070849/An-illustration-for-the-construction-in-the-proof-of-Theorem-5_Q320.jpg)
Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile
![Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile](https://www.researchgate.net/profile/Ioannis-Tollis/publication/298809254/figure/fig1/AS:801249058365445@1568044070748/Examples-of-edges-a-the-vertical-segment-of-edge-u-v-is-overloaded-reused-by-the_Q320.jpg)
Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile
![Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile](https://www.researchgate.net/profile/Ioannis-Tollis/publication/298809254/figure/fig5/AS:801249058377732@1568044070884/An-illustration-of-a-pq-component-of-a-single-source-single-sink-DAG-Every-path-from-the_Q320.jpg)
Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile
![Pioneer in Graph Analytics Technology Talks about Trends and Why Graphs Are Going Mainstream | Tom Sawyer Software Blog Pioneer in Graph Analytics Technology Talks about Trends and Why Graphs Are Going Mainstream | Tom Sawyer Software Blog](https://blog.tomsawyer.com/hs-fs/hubfs/Imported_Blog_Media/2017_08_30_0_TomSawyePerspectives_DoDIIS_ThankYouEmail.png?width=573&name=2017_08_30_0_TomSawyePerspectives_DoDIIS_ThankYouEmail.png)
Pioneer in Graph Analytics Technology Talks about Trends and Why Graphs Are Going Mainstream | Tom Sawyer Software Blog
![Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile](https://www.researchgate.net/profile/Ioannis-Tollis/publication/332970916/figure/fig1/AS:757047423430657@1557505579104/Hierarchical-drawing-computed-by-Tom-Sawyer-Perspectives-a-tool-of-Tom-Sawyer-Software_Q320.jpg)
Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile
![Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile](https://www.researchgate.net/profile/Ioannis-Tollis/publication/333971715/figure/fig3/AS:773157581500420@1561346540881/Output-of-Algorithm-ND-Draw-when-the-input-is-the-set-GCP-G0-G1-G2-G3-G4_Q320.jpg)
Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile
![Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile](https://www.researchgate.net/publication/371152360/figure/fig5/AS:11431281162892552@1685456181544/Execution-time-of-PBF-and-OGDF-on-Graphs-with-average-degree-16_Q320.jpg)
Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile
![Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile Ioannis TOLLIS | Professor | Ph.D. Computer Science | University of Crete, Rethymno | UOC | Department of Computer Science | Research profile](https://www.researchgate.net/profile/Ioannis-Tollis/publication/298809254/figure/fig3/AS:801249058377731@1568044070814/A-transitive-overloaded-orthogonal-drawing-right-of-the-graph-in-Figure-1-The_Q320.jpg)