Faculty
http://dyuthi.cusat.ac.in:80/xmlui/handle/purl/478
2014-09-30T23:59:06ZConvex extendable trees
http://dyuthi.cusat.ac.in:80/xmlui/handle/purl/2861
Convex extendable trees
Parvathy, K S; Vijayakumar,A
The concept of convex extendability is introduced to answer the problem of finding the smallest
distance convex simple graph containing a given tree. A problem of similar type with respect
to minimal path convexity is also discussed.
1999-01-01T00:00:00ZA characterization of fuzzy trees
http://dyuthi.cusat.ac.in:80/xmlui/handle/purl/2860
A characterization of fuzzy trees
Sunitha, M S; Vijayakumar,A
In this paper some properties of fuzzy bridges are studied.A characterization of fuzzy trees is obtained using these concepts.
1999-01-01T00:00:00ZClique Irreducibility and Clique Vertex Irreducibility of Graphs
http://dyuthi.cusat.ac.in:80/xmlui/handle/purl/2859
Clique Irreducibility and Clique Vertex Irreducibility of Graphs
Aparna,Lakshmanan S; Vijayakumar,A
A graphs G is clique irreducible if every clique in G of size at least two,has an edge which does not lie in any other clique of G and is clique reducible if it is not clique irreducible. A graph G is clique vertex irreducible if every clique in G has a vertex which does not lie in any other clique of G and clique vertex reducible if it is not clique vertex irreducible. The clique vertex irreducibility and clique irreducibility of graphs which are non-complete extended p-sums (NEPS) of two graphs are studied. We prove that if G(c) has at least two non-trivial components then G is clique vertex reducible and if it has at least three non-trivial components then G is clique reducible. The cographs and the distance hereditary graphs which are clique vertex irreducible and clique irreducible are also recursively characterized.
2009-01-01T00:00:00ZOPTIMAL UTILIZATION OF SERVICE FACILITY FOR A k-OUT-OF-n SYSTEM WITH REPAIR BY EXTENDING SERVICE TO EXTERNAL CUSTOMERS IN A RETRIAL QUEUE
http://dyuthi.cusat.ac.in:80/xmlui/handle/purl/2040
OPTIMAL UTILIZATION OF SERVICE FACILITY FOR A k-OUT-OF-n SYSTEM WITH REPAIR BY EXTENDING SERVICE TO EXTERNAL CUSTOMERS IN A RETRIAL QUEUE
Krishnamoorthy,A; Vishwanath, Narayanan C; Deepak,T G
In this paper, we study a k-out-of-n system with single server
who provides service to external customers also. The system consists of
two parts:(i) a main queue consisting of customers (failed components of
the k-out-of-n system) and (ii) a pool (of finite capacity M) of external
customers together with an orbit for external customers who find the pool
full. An external customer who finds the pool full on arrival, joins the orbit
with probability
and with probability 1−
leaves the system forever. An
orbital customer, who finds the pool full, at an epoch of repeated attempt,
returns to orbit with probability (< 1) and with probability 1 − leaves
the system forever. We compute the steady state system size probability.
Several performance measures are computed, numerical illustrations are
provided.
2007-01-01T00:00:00Z