Results 21 to 30 of about 4,092,369 (293)

Complex Spatial Query Processing [PDF]

open access: yesGeoInformatica, 2004
The user of a Geographical Information System is not limited to conventional spatial selections and joins, but may also pose more complicated and descriptive queries. In this paper, we focus on the efficient processing and optimization of complex spatial queries that involve combinations of spatial selections and joins. Our contribution is manifold; we
Mamoulis, N, Papadias, D, Arkoumanis, D
openaire   +3 more sources

Predator-Prey Relationship between Urban Bats and Insects Impacted by Both Artificial Light at Night and Spatial Clutter

open access: yesBiology, 2022
Predators respond to the increase of prey by aggregation in space or foraging more often. However, foraging habitat suitability limits predators’ responses.
Han Li, Kenneth T. Wilkins
doaj   +1 more source

A Comparison of Size, Shape, and Fractal Diversity Between Coral Rubble Sampled From Natural and Artificial Coastlines Around Okinawa Island, Japan

open access: yesFrontiers in Marine Science, 2021
Substrate surface area and fractal complexity have been reported to influence the abundance and diversity of mobile cryptic animal communities. Surfaces with higher fractal dimensions not only offer additional space for colonization, but bias space ...
Giovanni D. Masucci   +6 more
doaj   +1 more source

A Ubiquitous Collective Tragedy in Transport

open access: yesFrontiers in Physics, 2022
A tragedy of the commons is said to occur when individuals act only in their own interest but, in so doing, create a collective state of a group that is less than optimal due to uncoordinated action.
Rafael Prieto Curiel   +3 more
doaj   +1 more source

Institutional complexity is complexity with an adjective

open access: yes, 2021
A review of the studies on institutional complexity reveals that the many definitions of institutional complexity and related concepts share similarities with the understanding of complexity and complex systems of complexity science. Yet few publications
Papin, Marielle
core   +1 more source

Governing Complexity in World Politics

open access: yes, 2021
Complexity is the new global ontology for world politics. This article summarizes the characteristics of complexity and its implications for informed US state policy making.
Western, Jon, Haas, Peter M
core   +1 more source

The study of fractals among ecologists - doi: 10.4025/actascibiolsci.v34i1.7701

open access: yesActa Scientiarum: Biological Sciences, 2011
Fractals seemed to have permeated most scientific fields, including ecology. In fact, biodiversity and ecological processes are affected by spatial complexity, and fractals can help understand patterns at multiple scales.
Roger Paulo Mormul   +1 more
doaj   +3 more sources

What makes a “regime complex” complex? It depends

open access: yes, 2021
What makes the collections of international institutions or regimes governing various domains—called in theliterature regime, institutional, or governance complexes—“complex”?
Hollway, James
core   +1 more source

Complex delay dynamics on railway networks from universal laws to realistic modelling

open access: yesEPJ Data Science, 2018
Railways are a key infrastructure for any modern country. The reliability and resilience of this peculiar transportation system may be challenged by different shocks such as disruptions, strikes and adverse weather conditions. These events compromise the
Bernardo Monechi   +3 more
doaj   +1 more source

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