Zahra Naji Azimi

Dr. Zahra Naji Azimi


Research Focus & Metrics

Academic Career Length

23Years (2004-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

View All Publications
1 November 2012 in European Journal of Operational Research
Verified
Journal Article
Closed access
ZAZahra Naji Azimi
Zahra Naji Azimi
JRJ. Renaud
J. Renaud
Angel RuizAngel Ruiz
Angel Ruiz
MSMajid Salari
Majid Salari

1 November 2012 in INFORMS Journal on Computing
Verified
Journal Article
Closed access
BGBruce Golden
Bruce Golden
ZAZahra Naji Azimi
Zahra Naji Azimi
SRS. Raghavan
S. Raghavan
MSMajid Salari
Majid Salari
PTPaolo Toth
Paolo Toth
Given a graph G = (N, E), the covering salesman problem (CSP) is to identify the minimum length tour “covering” all the nodes. More specifically, it seeks the minimum-length tour visiting a subset of the nodes in N such that each node i not on the tour is within a predetermined distance di of a node on the tour. In this paper, we define and develop a generalized version of the CSP, and we refer to it as the generalized covering salesman problem (GCSP). Here, each node i needs to be covered at least ki times, and there is a cost associated with visiting each node. We seek a minimum-cost tour such that each node i is covered at least ki times by the tour. We define three variants of the GCSP. In the first case, each node can be visited by the tour at most once. In the second case, visiting a node i more than once is possible, but an overnight stay is not allowed (i.e., to revisit a node i, the tour has to visit another node before it can return to i). Finally, in the third case, the tour can visit each node more than once consecutively. In this paper, we develop two local search heuristics to find high-quality solutions to the three GCSP variants. To test the proposed algorithms, we generated data sets based on traveling salesman problem library instances. Because the CSP and the generalized traveling salesman problem are special cases of the GCSP, we tested our heuristics on both of those problems as well. Overall, the results show that our proposed heuristics find high-quality solutions very rapidly.

1 September 2010 in European Journal of Operational Research
Verified
Journal Article
Closed access
ZAZahra Naji Azimi
Zahra Naji Azimi
PTPaolo Toth
Paolo Toth
LGLaura Galli
Laura Galli

1 November 2012 in Computers & Operations Research
Verified
Journal Article
Closed access
MSMajid Salari
Majid Salari
ZAZahra Naji Azimi
Zahra Naji Azimi

1 April 2005 in Applied Mathematics and Computation
Verified
Journal Article
Closed access
ZAZahra Naji Azimi
Zahra Naji Azimi

16 December 2010 in European Journal of Operational Research
Verified
Journal Article
Closed access
ZAZahra Naji Azimi
Zahra Naji Azimi
MSMajid Salari
Majid Salari
PTPaolo Toth
Paolo Toth