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Zhora Nikoghosyan
Position: Senior Scientific Researcher

Phone: (+374 93) 508819
E-mail: zhora@ipia.sci.am




  Research Interests

Discrete Mathematics, Graph Theory and Combinatorics. Existence problems of long (large) cycles and paths in graphs, as well as spanning trees in graphs with few end vertices (leaves) and few branch vertices - in forms of various generalizations and improvements of classical results based on minimum degree, connectivity, toughness, forbidden subgraphs and outside structures.

 
  Education

M.Sc.   Yerevan State University, Department of Applied  Mathematics
 
  Titles, Degree

Ph.D. in Mathematical Cybernetics, Minsk Institute of Mathematics, Byeloruss Academy of Sciences, Thesis: “On two generalizations of hamiltonian problem in graph theory”

 
  Professional Experience

Senior Scientific Researcher   Institute for Informatics and Automation Problems of NAS RA,(1999 – present)

Lecturer   Gyumri Information Technologies Center
(2005-2011)

Senior Lecturer   Institute for Raising the Qualification
of Teachers, (1989 – 1993)

Scientific Researcher   Institute for Informatics and Automation
Problems of NAS RA, (1974 – 1989)
 
  Selected Publications
Zh. Nikoghosyan, On maximal cycle of a graph (Russian), DAN Arm. SSR, v. LXXII, No. 2 (1981) 82-87.

R. Häggkvist and G.G. Nicoghossian, A remark on hamiltonian cycles, J. Combin. Theory Ser. B 30 (1981) 118-120.

Zh. Nikoghosyan, Spanning trees on simple 3-polytopes (Russian), Kybernetika, No. 4 (1982) 35-42.

Zh. Nikoghosyan, n-spanning and hypo-n-spanning graphs (Russian), tanulmanyok, No. 135, Budapest (1982) 153-167.

Zh. Nikoghosyan, On maximal cycles of a graph (Russian), Studia Scientiarum Mathematicarum Hungarica 17 (1982) 251-282.

Zh. Nikoghosyan, A sufficient condition for a graph to be hamiltonian (Russian), DAN Arm. SSR, v. LXXVIII, No. 1 (1984) 12-16.

Zh. Nikoghosyan, An hamiltonian sufficient condition of a graph (Russian), Matematicheskie voprosy kibernetiki i vychislitelnoj tekhniki, v. XIV (1985) 34-54.

Zh. Nikoghosyan, On longest cycles in graphs (Russian), DAN Arm. SSR, v. LXXXI, No. 4 (1985) 166-170.

Zh.G. Nikoghosyan, Path-Extensions and Long Cycles in Graphs, Mathematical Problems of Computer Science 19 (1998) 25-31.

Zh,G. Nikoghosyan, Cycle-Extensions and Long Cycles in Graphs, Mathematical Problems of Computer Science 21 (2000) 121-128.

Zh.G. Nikoghosyan, Cycle-Extensions and Long Cycles in k-connected Graphs, Mathematical Problems of  Computer Science 21 (2000) 129-155.

Zh.G. Nikoghosyan, Discrete Mathematics (Armenian), Gyumri Information Technologies Center (2007) 334 p.

Zh.G. Nikoghosyan, Dirac-type generalizations concerning large cycles in graphs, Discrete Mathematics 309 (2009) 1925-1930, doi: 10.1016/j.disc.2008.03.011.

M.Zh. Nikoghosyan, Zh.G. Nikoghosyan, Large cycles in 4-connected graphs, Discrete Math. 311 (2011) 302-306. doi:10.1016/j.disc.2010.10.020.

Zh.G. Nikoghosyan, “Graph Invariants and Large Cycles: A Survey”, International Journal of Mathematics and Mathematical Sciences, vol. 2011, Article ID 206404, 11 pages, 2011. doi:10.1155/2011/206404. 

Zh.G. Nikoghosyan, Pure Links Between Graph Invariants and Large Cycle Structures, New Frontiers in Graph Theory, Dr. Yagang Zhang (Ed.) (2012) 19-42, ISBN: 978-953-51-0115-4, InTech,  Available from: http://www.intechopen.com/books/new-frontiers-in-graph-theory/pure-links-between-graph-invariants-and-large-cycle-structures-

Zh.G. Nikoghosyan, Two Sufficient Conditions for Hamilton and Dominating Cycles, International Journal of Mathematics and Mathematical Sciences, Article in Press, v. 2012, ID 185346, 25p. DOI: 10.1155/2012/185346.

Zh.G. Nikoghosyan, Disconnected forbidden subgraphs, toughness and Hamilton cycles, ISRN Combinatorics, Volume 2013, Article ID 673971, 4 pages, http://dx.doi.org/10.1155/2013/673971.

Zh.G. Nikoghosyan, Advanced Lower Bounds for the Circumference, Graphs and Combinatorics 29 (2013) 1531-1541. DOI: 10.1007/s00373-012-1209-4. 

 
News
2019թ. մարտի 19-ին ժ. 11:30-12:30-ը
Ինֆորմատիկայի և ավտոմատացման պրոբլեմների ինստիտուտում (2-րդ հարկ, 209 սենյակ) անցկացվելու է դասախոսություն հետևալ թեմայով. Introduction to Information Retrieval (information retrieval and its basic concepts; current challenges of information retrieval).

Զեկուցողն է Թուլուզի Ինֆորմատիկայի հետազոտությունների ինստիտուտի (IRIT) պրոֆեսոր Ժոզիան Մոթեն (Josiane Mothe):

Բոլոր ցանկացողները հրավիրվում են մասնակցելու:



On March 19, 2019 at 14:00

Seminar of Department for Information theory and statistical models  will be held on the topic: "Information-Theoretic Investigation of Community Detection Problems and Recommender Framework Development". Reporter: PhD student Karen Mkhitaryan.



2019թ. մարտի 21-ին ժ. 14:00-16:00-ը
Ինֆորմատիկայի և ավտոմատացման պրոբլեմների ինստիտուտում անցկացվելու է գիտական սեմինար հետևալ թեմայով. "Lessons learnt from the FabSpace 2.0 experience (FabSpace 2.0 concepts, carried on activities, lessons learnt). FabSpace is an open-innovation network for geodata-based innovation – by leveraging Space data in particular in Universities 2.0. It is a one-stop shop-access to Space data and a wide range of other data as well as free software and data processing tools to develop new digital applications".

Զեկուցողն է` Թուլուզի Ինֆորմատիկայի հետազոտությունների ինստիտուտի (IRIT) պրոֆեսոր Ժոզիան Մոթեն (Josiane Mothe):



                                                           
CONTACTS
  • 0014, Yerevan, Republic of Armenia, 1, P. Sevak str.
  • Phone: (+37410) 28-20-30
  • Fax: (+37410) 28-20-50
  • E-mail: ipia@ipia.sci.am
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