Publications

Refereed Int'l /National Journals

2021
  • Shiva Prakash Gupta, Urmila Pyakurel and Tanka Nath Dhamala, Network Flows with Arc Reversals and Non-Symmetric Transit Times. American Journal of Mathematics and Statistics, 2021 11(2), pp. 27-33.
  • Shiva Prakash Gupta, Urmila Pyakurel and Tanka Nath Dhamala, Generalized Dynamic Contraflow with Non-Symmetric Transit Times, American Journal of Computational and Applied Mathematics, 2021 11(1), pp. 12-17
  • Hari Nandan Nath, Urmila Pyakurel, Tanka Nath Dhamala, Network reconfiguration with orientation-dependent transit times, International Journal of Mathematics and Mathematical Sciences, Volume 2021, Article ID 6613622, https://doi.org/10.1155/2021/6613622
  • Urmila Pyakurel, and Sachin Wagle, Prioritized continuous dynamic contraflow on multi-terminal network, International Journal of Innovative Science Engineering and Technology (IJISET), 8(2) 147-152, 2021, ISSN: 2348 – 7968, http://www.ijiset.com/articles.html
  • Urmila Pyakurel and Stephan Dempe, Universal Maximum Flow with intermediate storage for Evacuation, Planning. Chapter in: Kotsireas I.S., Nagurney A., Pardalos P.M., Tsokas A. (eds) Dynamics of Disasters, pp 229-241, 2021. Springer Optimization and Its Applications, vol 169. Springer, Cham, https://doi.org/10.1007/978-3-030-64973-9_14
2020
  • Urmila Pyakurel and Stephan Dempe, Network flow with intermediate storage: Models and Algorithms, SN Operations Research Forum 1, 37 (2020). DOI: https://doi.org/10.1007/s43069-020-00033-0
  • Shiva Prakash Gupta, Durga Prasad Khanal, Urmila Pyakurel, Tanka Nath Dhamala, Approximate Algorithms for Continuous-Time Quickest Multi-Commodity Contraflow Problem, The Nepali Mathematical Sciences Report, 37 (1 & 2), 30-46,  2020. DOI: https://doi.org/10.3126/nmsr.v37i1-2.34068
  • Urmila Pyakurel, Shiva Prakash Gupta, Durga Prasad Khanal, Tanka Nath Dhamala, Efficient Algorithms on Multicommodity Flow over Time Problems with Partial Lane Reversals, International Journal of Mathematics and Mathematical Sciences, Volume 2020, Article ID 2676378, https://doi.org/10.1155/2020/2676378.
  • Tanka Nath Dhamala, Shiva Prakash Gupta, Durga Prasad Khanal, Urmila Pyakurel, Quickest Multi-Commodity Flow Over Time with Partial Lane Reversals, Journal of Mathematics and Statistics,  16(1), 198-211, 2020, DOI: https://doi.org/10.3844/jmssp.2020.198.211.
  • Urmila Pyakurel, Sachin Wagle and Mohan Chandra Adhikari, Efficient lane reversals for prioritized maximum flow, International Journal of Innovative Science Engineering and Technology (IJISET), 7(7) 354-363, 2020.
  • Iswar Mani Adhikari, Urmila Pyakurel, and Tanka Nath Dhamala, An integrated solution approach for time minimization evacuation planning problem. International Journal of Operations Research, 17(1) 27-39, 2020,  DOI:10.6886/IJOR.202003_17(1).0002   
  • Hari Nandan Nath, Urmila Pyakurel, Tanka Nath Dhamala, and Stephan Dempe, Dynamic Network Flow Location Models and Algorithms for Evacuation Planning, AIMS Journals, Journal of Industrial and Management Optimization (JIMO)  2020, Doi: 10.3934/jimo.2020102 
2019
  • Urmila Pyakurel, Hari Nandan Nath Stephan Dempe, and Tanka Nath Dhamala, Efficient Algorithms for Flow over Time Evacuation Planning Problems with Lane Reversal Strategy, Mathematics, 7(10), 993, 2019,  https://doi.org/10.3390/math7100993.  
  • Hari Nandan Nath, Urmila Pyakurel, Tanka Nath Dhamala and Stephan Dempe.  A path saving strategy with arc reversals for evacuation planning. International Journal of Innovative Knowledge Concepts, 7(1) 160-165, 2019.
  • Urmila Pyakurel. Efficient algorithms for minimum cost flow problem with partial lane reversals, The Nepali Math. Sc. Report 36(1&2), 49-57, 2019.
  • Urmila Pyakurel and Stephan Dempe.  Earliest arrival flow with partial lane reversals for evacuation planning. International Journal of Operations Research Nepal (IJORN), 8(1), 27-37, 2019.
  • Durga Prasad Khanal, Shiva Prakash Gupta, Urmila Pyakurel and Tanka Nath Dhamala.  An approximation for general transit time function. International Journal of Operational Research Nepal (IJORN), 8(1), 13-25, 2019.
  • Santosh Gautam, Urmila Pyakurel and Tanka Nath Dhamala. Generalized Dynamic Flow on Lossy Network, Journal of Institute of Science and Technology, 15(2), 2019, DOI: https://doi.org/10.3126/jie.v15i2.27664.
  • Urmila Pyakurel, Hari Nandan Nath and Tanka Nath Dhamala. Partial Contraflow with Path Reversals for Evacuation Planning, Annals of Operations Research, 283, 591-612, 2019, https://doi.org/10.1007/s10479-018-3031-8.
2018
  • Tanka Nath Dhamala, Urmila Pyakurel and Stephan Dempe (2018), A critical survey on the network optimization algorithms for evacuation planning problems, International Journal of Operations Research, Vol. 15, No. 3, 101-133 (2018), DOI: 10.6886/IJOR.201809_15(3).0002.  
  • Urmila Pyakurel, Hari Nandan Nath, Tanka Nath Dhamala, Efficient contraflow algorithms for quickest evacuation planning, Science China Mathematics, 61, 2079–2100, 2018, DOI: https://doi.org/10.1007/s11425-017-9264-3  
  • Ram Chandra Dhungana, Urmila Pyakurel and Tanka Nath Dhamala (2018), Abstract Contraflow Models and Solution Procedures for Evacuation Planning, Journal of Mathematics Research, 10(4), 2018, DOI:10.5539/jmr.v10n4p89.
  • Urmila Pyakurel. Generalized Contraflow for Evacuation Planning Problem, Journal of Nepal Mathematical Society (JNMS), 1 (1), 38-49, 2018.
  • Durga Prasad Khanal, Urmila Pyakurel and Tanka Nath Dhamala. Flow Over Time Problem with Inflow-Dependent Transit Times. Journal of the Institute of Science and Technology, 23, 49-56, 2018, DOI: https://doi.org/10.3126/jist.v23i1.22161.
  • Tanka Nath Dhamala, Iswarmani Adhikari, Hari Nandahn Nath and Urmila Pyakurel. Meaningfulness of OR Models and Solution Strategies for Emergency Planning, In: Kruhl J., Adhikari R., Dorka U. (eds) Living with the Threat of Earthquakes, 175-194, 2018, DOI: https://doi.org/10.1007/978-3-319-68044-6_12  Springer Natural Hazards.
2017
  • Urmila Pyakurel; Efficient Algorithms for Contraflow Reconfiguration in Evacuation Planning, Neural, Parallel, and Scientific Computations 25 (3 and 4), 469--484 (2017).
  • Urmila Pyakurel and Tanka Nath Dhamala, Evacuation planning by earliest arrival contraflow, AIMS Journals, Journal of Industrial and Management Optimization (JIMO), 13(1): 489-503, 2017, doi: 10.3934/jimo.2016028 .
  • Urmila Pyakurel and Tanka Nath Dhamala, Continuous Dynamic Contraflow Approach for Evacuation Planning, Annals of Operations Research, 253, 573–598, (2017) DOI: https://doi.org/10.1007/s10479-016-2302-5
  • Urmila Pyakurel, Tanka Nath Dhamala and Stephan Dempe, Efficient Continuous Contraflow Algorithms for Evacuation Planning Problems, Annals of Operations Research (ANOR), 254, (1&2), 335–364, 2017, DOI: https://doi.org/10.1007/s10479-017-2427-1.  
  • Urmila Pyakurel. Network Flow Models for Evacuation Planning, Journal of the Institute of Engineering (JIE), 13 (1), 90-101, 2017, DOI: https://doi.org/10.3126/jie.v13i1.20353.
2016
  • Urmila Pyakurel and Tanka Nath Dhamala, Continuous time dynamic contraflow models and Algorithms. Advanced in Operations Research, Volume 2016, 1-6, 2016 Hindawi Publishers, DOI: https://doi.org/10.1155/2016/7902460.
  • Urmila Pyakurel, Marc Goerigk, Tanka Nath Dhamala and Horst W. Hamacher , Transit Dependent Evacuation Planning for Kathmandu Valley: A Case Study, International Journal of Operational Research Nepal, IJORN 5, 49-73, 2016.
  • Urmila Pyakurel , Transshipment contraflow on multi-terminal networks. The Nepali Math. Sc. Report, 34(1&2), 39-45, 2016.
  • Tanka Nath Dhamala and Urmila Pyakurel. Significance of transportation network models in emergency planning of urban cities. Int'l Journal of Cities, People and Places, 1(2), 58-76, 2016, DOI: http://doi.org/10.4038/cpp.v1i2.10.
2015
  • Urmila Pyakurel and Tanka Nath Dhamala, Models and algorithms on contraflow evacuation planning network problems, International Journal of Operations Research (Taiwan), 12(2): 36-46, 2015.
  • Ram Chandra Dhungana, Urmila Pyakurel, Shree Ram Khadka and Tanka Nath Dhamala, Efficient algorithm on universally maximum contraflow, International Journal of Operations Research Nepal, 4, 67-78, 2015.
2014
  • Urmila Pyakurel and Tanka Nath Dhamala, Earliest arrival contraflow model for evacuation planning, Neural, Parallel, and Scientific Computations,  22(3), 441-450, 2014.
  • Urmila Pyakurel, Tanka Nath Dhamala and HorstW. Hamacher, Generalized maximum dynamic contraflow on lossy network, International Journal of Operational Research, Nepal, 3, 27-44, 2014.
2013
  • Tanka Nath Dhamala and Urmila Pyakurel, Earliest Arrival Contraflow Problem on Series- Parallel Graphs, International Journal of Operational Research (IJOR-TW), 10, 1-13, 2013.