# About Me

I am a full-time Ph.D. student ad researcher at the Department of Computer Science, Masaryk University .
My thesis supervisor is Petr Hliněný .
My main area of interest is computational geometry.
Particularly, I am interested in visibility graphs and unit disk graphs.

I am a member of Laboratory of Discrete Methods and Algorithms (DIMEA) research group.

###### address

Office C420

Botanická 68A

Brno, CZ

onur@mail.muni.cz

###### phone

+420 549 49 6748

# Research

My areas of interest

###### Conflict-free coloring of polygon visibility graphs

**Conflict-free coloring** of a simple graph is assigning colors to a subset of vertices such that every vertex in the graph sees a unique color. A polygon visibility graph is a graph that describes the visibility relations among the vertices of a given polygon.

###### Unit disk graph recognition on restricted domains

**Recognizing** of a unit disk graph is determining whether a given simple graph can be realized as an intersection graph of unit disks.
A **restricted domain** is a pre-determined solution space where the disks are allowed to be centered.

###### Maximum clique of a disk set

A **clique** is a set of disks where each disk mutually intersect. The aim is to find such a set with maximum cardinality. It is not yet known whether this problem is tractable.

Events I have attended

###### Workshops

May 2019, Telč, Czech Republic -- Crossing Numbers Workshop '19

October 2017, Telč, Czech Republic -- MEMICS '17

May 2017, Osnabrück, Germany -- Crossing Numbers Workshop '17

October 2016, Telč, Czech Republic -- MEMICS '16

###### Miscellaneous

April 2017, Žďár nad Sázavou, Czech Republic -- Spring School of Combinatorics '17

December 2016, Prague, Czech Republic -- CE-ITI '16

# Short CV

For my full CV click here.

## Activities

**2019**

visiting researcher at ENS de Lyon *Lyon, France*

**2017**

visiting researcher at UASLP *San Luis Potosí, Mexico*

visiting researcher at UNAM *Mexico City, Mexico*

visiting researcher at Cinvestav *Mexico City, Mexico*

visiting researcher at Jagiellonian University *Kraków, Poland*

**2016 - ongoing**

PhD at Masaryk University *Brno, Czech Republic *

**2012-15**

MSc at Izmir University of Economics *Izmir, Turkey*

**2010**

Internship at University of Cantabria *Santander, Spain*

**2008**

Internship at Coretech *Istanbul, Turkey*

**2007-11**

BSc at Izmir University of Economics *Izmir, Turkey*

## Publications

[1] **Onur Çağırıcı**, Subir Kumar Ghosh, Petr Hliněný, Bodhayan Roy: *On conflict-free chromatic guarding of simple polygons
. * CoRR abs/arXiv:1904.08624 (2019)

[2] **Onur Çağırıcı**: *Axes-parallel unit disk graph recognition is NP-hard. * CoRR abs/1811.09881 (2018)

[3] **Onur Çağırıcı**, Petr Hlinený, Bodhayan Roy: *On Colourability of Polygon Visibility Graphs. * FSTTCS 2017

[4] **Onur Çağırıcı**: *Exploiting Coplanar Clusters to Enhance 3D Localization in Wireless Sensor Networks.* CoRR abs/1502.07790 (MSc thesis, 2015)