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Izvorni znanstveni članak
https://doi.org/10.17535/crorr.2015.0007
Efficient parallel implementations of approximation algorithms for guarding 1.5D terrains
Goran Martinović
orcid.org/0000-0002-7469-6018
; Faculty of Electrical Engineering, Josip Juraj Strossmayer University of Osijek, Osijek, Croatia
Domagoj Matijević
; Department of Mathematics, Josip Juraj Strossmayer University of Osijek, Osijek, Croatia
Domagoj Ševerdija
; Department of Mathematics, Josip Juraj Strossmayer University of Osijek, Osijek, Croatia
| Puni tekst: engleski, pdf (158 KB) | str. 79-89 | citiraj | |
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APA 6th Edition Martinović, G., Matijević, D. i Ševerdija, D.. (2015). Efficient parallel implementations of approximation algorithms for guarding 1.5D terrains. Croatian Operational Research Review, 6 (1), 79-89. https://doi.org/10.17535/crorr.2015.0007 MLA 8th Edition Martinović, Goran, et al. "Efficient parallel implementations of approximation algorithms for guarding 1.5D terrains." Croatian Operational Research Review, vol. 6, br. 1, 2015, str. 79-89. https://doi.org/10.17535/crorr.2015.0007. Citirano 18.09.2020. Chicago 17th Edition Martinović, Goran, Domagoj Matijević i Domagoj Ševerdija. "Efficient parallel implementations of approximation algorithms for guarding 1.5D terrains." Croatian Operational Research Review 6, br. 1 (2015): 79-89. https://doi.org/10.17535/crorr.2015.0007 Harvard Martinović, G., Matijević, D., i Ševerdija, D.. (2015). 'Efficient parallel implementations of approximation algorithms for guarding 1.5D terrains', Croatian Operational Research Review, 6(1), str. 79-89. https://doi.org/10.17535/crorr.2015.0007 Vancouver Martinović G, Matijević D, Ševerdija D. Efficient parallel implementations of approximation algorithms for guarding 1.5D terrains. Croatian Operational Research Review [Internet]. 2015 [pristupljeno 18.09.2020.];6(1):79-89. https://doi.org/10.17535/crorr.2015.0007 IEEE G. Martinović, D. Matijević i D.. Ševerdija, "Efficient parallel implementations of approximation algorithms for guarding 1.5D terrains", Croatian Operational Research Review, vol.6, br. 1, str. 79-89, 2015. [Online]. https://doi.org/10.17535/crorr.2015.0007 |
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Sažetak
In the 1.5D terrain guarding problem, an x-monotone polygonal line is de ned by k vertices and a G set of terrain points, i.e. guards, and a N set of terrain points which guards are to observe (guard). This involves a weighted version of the guarding problem where guards G have weights. The goal is to determine a minimum weight subset of G to cover all the points in N, including a version where points from N have demands. Furthermore, another goal is to determine the smallest subset of G, such that every point in N is observed by the required number of guards. Both problems are NP-hard and have a factor 5 approximation [3, 4]. This paper will show that if the (1+ϵ)-approximate solver for the corresponding linear program is a computer, for any ϵ > 0, an extra 1+ϵ factor will appear in the fi nal approximation factor for both problems. A comparison will be carried out the parallel implementation based on GPU and CPU threads with the Gurobi solver, leading to the conclusion that the respective algorithm outperforms the Gurobi solver on large and dense inputs typically by one order of magnitude.
Ključne riječi
1.5D terrain guarding; linear programming; CUDA; approximation algorithm
Hrčak ID: 138580
URI
https://hrcak.srce.hr/138580
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