Results 261 to 270 of about 2,789,688 (309)
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Decentralized spatial spectrum access
2013 IEEE International Conference on Communications (ICC), 2013In this paper, we study the distributed spectrum sharing problem with spatial reuse and without explicit message passing. We propose tow novel threshold-based decentralized spatial spectrum access algorithms, which do not require information exchange among secondary users and channel switching at the equilibrium state.
Bangyi Zhu +2 more
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Spatial Accessibility to Pediatric Services
Journal of Community Health, 2008The objective of this study was to assess spatial accessibility (SA) to pediatric healthcare services at hospitals in Chiba Prefecture, Japan in 2006. We considered the distribution of general pediatricians and neonatologists relative to the geographical distribution of children using the two-step floating catchment area method, which accounts for the ...
Fabiana, Cervigni +3 more
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A Temporal Spatial Access Method
2010 Sixth International Conference on Signal-Image Technology and Internet Based Systems, 2010In this paper, we present a novel temporal spatial access method that is based on the PM Quad tree. It is intended for the efficient management of multi-version maps, where each version is a result of some kinds of modifications at a given point of time.
Ameur Touir +2 more
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Spatial database access methods
ACM SIGMOD Record, 1991In the discussion of research issues in spatial databases (SIGMOD Record vol. 19, no. 4, Dec 1990) we stated the need for a robust framework for analytical comparison of a broad range of spatial access methods. The utility of such a comparison, even of very closely related access methods, was shown in [FALO87]. A necessary precondition for a meaningful
Betty Salzberg, David B. Lomet
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Accessibility, Efficiency, and Spatial Organization
Environment and Planning A: Economy and Space, 1979The author makes the hypothesis that higher spatial equity does not always mean lower economic efficiency. An attempt is made to check this hypothesis by working out four alternative spatial organizations—described as egalitarian, centralistic, moderate, and moderately concentrated—and evaluating them from the viewpoint of spatial equity and economic ...
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Accessibility and Spatial Interaction
2014The concept of accessibility is linked to the level of opportunities available for spatial interaction (flows of people, goods or information) between a set of locations, through a physical and/or digital transport infrastructure network. Accessibility has proved to be a crucial tool for understanding the framework of sustainability policy in light of ...
Melhorado, Ana Condeco +2 more
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Spatial distributed dynamic spectrum access
2013 IEEE International Conference on Communications (ICC), 2013The spatial aspect of distributed dynamic spectrum access (DSA) in a wireless ad hoc network is usually overlooked in the literature. By using tools from stochastic geometry, we analytically characterized the spatial distribution of users and subsequent interference in the network.
Ching-Yueh Kao +2 more
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Accessibility and Spatial Interaction
Transport Reviews, 2015Which combination of transport and economic development policies best promote wider access to goods and services for individuals and businesses?
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Remote access to large spatial databases
Proceedings of the tenth ACM international symposium on Advances in geographic information systems - GIS '02, 2002Enterprises in the public and private sectors have been making their large spatial data archives available over the Internet. However, interactive work with such large volumes of online spatial data is a challenging task. We propose two efficient approaches to remote access to large spatial data.
Egemen Tanin +2 more
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2000
Spatial Databases cover a wide set of applications that handle spatial data, such as points, lines, and regions in multi-dimensional space. GISs are the most popular ones. GIS applications include cartography and network (such as road, telephone, or computer) mapping; apart from such applications, spatial data sets are of interest in the fields of ...
Yannis Manolopoulos +2 more
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Spatial Databases cover a wide set of applications that handle spatial data, such as points, lines, and regions in multi-dimensional space. GISs are the most popular ones. GIS applications include cartography and network (such as road, telephone, or computer) mapping; apart from such applications, spatial data sets are of interest in the fields of ...
Yannis Manolopoulos +2 more
openaire +1 more source