Sigrid Ewert
Sigrid Ewert
Professor for Computer Science, University of the Witwatersrand, Johannesburg
Verified email at wits.ac.za
Title
Cited by
Cited by
Year
A shrinking lemma for random forbidding context languages
A van der Walt, S Ewert
Theoretical Computer Science 237 (1-2), 149-158, 2000
372000
A pumping lemma for random permitting context languages
S Ewert, A van der Walt
Theoretical Computer Science 270 (1-2), 959-967, 2002
352002
A property of random context picture grammars
A van der Walt, S Ewert
Theoretical computer science 301 (1-3), 313-320, 2003
312003
A property of random context picture grammars
A van der Walt, S Ewert
Theoretical computer science 301 (1-3), 313-320, 2003
312003
Generating pictures using random permitting context
S Ewert, A van der Walt
International Journal of Pattern Recognition and Artificial Intelligence 13 …, 1999
221999
Computing raster images from grid picture grammars
F Drewes, S Ewert, R Klempien-Hinrichs, HJ Kreowski
Journal of Automata, Languages and Combinatorics 8 (3), 499-519, 2003
192003
Generating pictures using random forbidding context
S Ewert, A van der Walt
International journal of pattern recognition and artificial intelligence 12 …, 1998
191998
Abstracting and narrating novice programs using regular expressions
A Ade-Ibijola, S Ewert, I Sanders
Proceedings of the Southern African Institute for Computer Scientist and …, 2014
162014
Random context picture grammars: The state of the art
S Ewert
Manipulation of Graphs, Algebras and Pictures. Essays Dedicated to Hans-Jörg …, 2009
162009
A hierarchy result for random forbidding context picture grammars
S Ewert, A van der Walt
International journal of pattern recognition and artificial intelligence 13 …, 1999
111999
A novel approach to visual password schemes using tree picture grammars
B Okundaye, S Ewert, I Sanders
Proceedings of the 2014 PRASA, RobMech and AfLaT International Joint …, 2014
92014
Bag context tree grammars
F Drewes, C du Toit, S Ewert, B van der Merwe, APJ van der Walt
International Conference on Developments in Language Theory, 226-237, 2006
92006
Random context tree grammars and tree transducers: reviewed article
F Drewes, C Du Toit, S Ewert, J Hogberg, B Van der Merwe, ...
South African Computer Journal 2005 (34), 11-25, 2005
92005
Shrink indecomposable fractals
S Ewert, APJ van der Walt
Journal of Universal Computer Science 5 (9), 521-531, 1999
91999
Introducing Code Adviser: A DFA-driven electronic programming tutor
A Ade-Ibijola, S Ewert, I Sanders
International Conference on Implementation and Application of Automata, 307-312, 2015
82015
Regex Parser II: Teaching regular expression fundamentals via educational gaming
A Rosenfeld, A Ade-Ibijola, S Ewert
Annual Conference of the Southern African Computer Lecturers' Association …, 2017
72017
Requirements for secure graphical password schemes
M Rasekgala, S Ewert, I Sanders, T Fogwill
2014 IST-Africa Conference Proceedings, 1-10, 2014
72014
Determining image similarity from pattern matching of abstract syntax trees of tree picture grammars
B Okundaye, S Ewert, I Sanders
Proceedings of the Twenty-Fourth Annual Symposium of the Pattern Recognition …, 2013
72013
A note on the generative capacity of random context: reviewed article
B Atcheson, S Ewert, D Shell
South African Computer Journal 2006 (36), 95-98, 2006
72006
Translating mutually recursive function systems into generalized random context picture grammars: reviewed article
H Kruger, S Ewert
South African Computer Journal 2006 (36), 99-109, 2006
62006
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