Results 181 to 190 of about 41,749 (283)

Exact Solutions for the Moving Firefighter Problem on Trees

open access: yesNetworks, Volume 88, Issue 1, Page 42-58, July 2026.
ABSTRACT The moving firefighter problem (MFP) is a more realistic variant of the classic firefighter problem (FP), where firefighters require time for both travel and defense. Unfortunately, the only known exact solution for the MFP does not scale. In this paper, we establish that the MFP is NP‐complete on trees of maximum degree three and present four
Mauro A. Montenegro‐Meza   +4 more
wiley   +1 more source

On Parallel Tree Traverse in Ada

open access: yesOn Parallel Tree Traverse in Ada
Two new methods for parallel tree traverse are given, and their implementations are described and tested in Ada which supports parallel programming via Ada tasks. The simulations performed show that (1) when there are no restriction imposed on the number of Ada tasks, the amount of time required for the traverse remains constant (equaling a number ...
openaire  

Shaping Decision Models for Stochastic Dynamic Optimization Problems via Reinforcement Learning

open access: yesNetworks, Volume 88, Issue 1, Page 138-157, July 2026.
ABSTRACT With rising customer expectations and increasing computational potential, many transport, manufacturing, and production operations face real‐time decision making in stochastic dynamic environments. Decision makers must find and adapt complex plans that are effective now but also flexible with respect to future developments.
Florentin D. Hildebrandt   +3 more
wiley   +1 more source

Dicrananthera hedyotidea C. Presl. (Melastomataceae) in Maranhão state, Brazil: first record and ecological niche model of the species

open access: yesNordic Journal of Botany, EarlyView.
Dicrananthera C. Presl. is a monospecific genus of the tribe Marcetieae, comprising perennial herbs typically occurring in areas adjacent to wetlands. The species exhibits a disjunct distribution, with confirmed records in both the Amazon and Atlantic Forest domains.
Elias Julio Oliveira Correa   +4 more
wiley   +1 more source

Taxonomic novelties in subgenus Euphorbia (Euphorbiaceae) from South India

open access: yesNordic Journal of Botany, EarlyView.
Extensive floristic explorations throughout southern India have uncovered some noteworthy taxonomic additions within the subgenus Euphorbia (Euphorbiaceae). Three distinct taxa of Euphorbia are described and illustrated herein as E. sankarensis, E. bahalita and E. tortilis var. mysorensis.
Sarojini Devi Naidu   +1 more
wiley   +1 more source

Trust and class aware service discovery with dual control in the social Internet of Things. [PDF]

open access: yesSci Rep
Rehman A   +5 more
europepmc   +1 more source

Impacts of reindeer grazing on phosphorus sorption and nutrient availability in a tundra site

open access: yesOikos, Volume 2026, Issue 6, June 2026.
Reindeer Rangifer tarandus, a large circumpolar herbivore, can influence whether nitrogen (N) or phosphorus (P) is the primary limiting nutrient in tundra plant communities. Specifically, findings from a site in northern Scandinavia suggest that under conditions where reindeer grazing stimulates inorganic N availability, grazing may drive ecosystems ...
Jerzy Szejgis   +5 more
wiley   +1 more source

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