Results 271 to 280 of about 3,145,207 (318)
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Spatial and spatial-frequency primitives in spatial-interval discrimination
Journal of the Optical Society of America A, 1985Thresholds for spatial-interval discrimination were determined under conditions designed to introduce randomness in the spatial-frequency content of the stimuli from trial to trial. Neither a random scaling of the display nor the addition of flanking bars at varying distances affected the observer's ability to judge the relative interval between pairs ...
M J, Morgan, R M, Ward
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ON SPATIAL PERIODIC ORBITS AND SPATIAL CHAOS
International Journal of Bifurcation and Chaos, 2003This paper introduces an analytical method for constructing spatial periodic orbits of specified periods. This result is then extended to generating spatial chaos in the sense of Li and Yorke.
Guanrong Chen, Shu Tang Liu
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Spatial Interaction and Spatial Autocorrelation
2008The objective is to combine insights from two research traditions, spatial interaction modelling and spatial autocorrelation modelling, to deal with the issue of spatial autocorrelation in spatial interaction data analysis. First, the problem is addressed from an exploratory perspective for which a generalisation of the Getis–Ord G statistic is ...
Fischer, Manfred M. +2 more
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Spatial Pricing, Spatial Rents, and Spatial Welfare
The Quarterly Journal of Economics, 1982This paper presents a model of spatial equilibrium that integrates elements of spatial pricing and ThA¼nen location models. Properties of equilibrium under mill, uniform, and discriminatory pricing regimes are explored. Three comparative propositions concerning firm, consumer, and landowner welfare that obtain under the alternative pricing schemes are ...
Timothy J. Gronberg, Jack Meyer
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ACM SIGMOD Record, 2000
This paper discusses issues related to the integration of spatial operators into the new generation of SQL-like query languages. Starting from spatial data models, current spatial extensions of query languages are briefly reviewed and research directions are highlighted.
CLEMENTINI, ELISEO, DI FELICE P.
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This paper discusses issues related to the integration of spatial operators into the new generation of SQL-like query languages. Starting from spatial data models, current spatial extensions of query languages are briefly reviewed and research directions are highlighted.
CLEMENTINI, ELISEO, DI FELICE P.
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Conference companion on Human factors in computing systems common ground - CHI '96, 1996
1 Objectives 4 Part One: Introduction and Motivation 12 1.1 Why Spatial Metaphors in Interaction? 14 1.2 Introductory Examples 32 1.3 The Structure of (Spatial) Metaphors 44 1.4 Summary 52 Part Two: A Framework for Understanding Spatialization 62 2.1 The Structure of Spatial Source Domains 64 2.2 What Space Affords its Users 88 2.3 Prototypical Spaces ...
Werner Kuhn, Brad Blumenthal
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1 Objectives 4 Part One: Introduction and Motivation 12 1.1 Why Spatial Metaphors in Interaction? 14 1.2 Introductory Examples 32 1.3 The Structure of (Spatial) Metaphors 44 1.4 Summary 52 Part Two: A Framework for Understanding Spatialization 62 2.1 The Structure of Spatial Source Domains 64 2.2 What Space Affords its Users 88 2.3 Prototypical Spaces ...
Werner Kuhn, Brad Blumenthal
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Design of Spatial Constellation for Spatial Modulation
IEEE Wireless Communications Letters, 2020In order to achieve the transmission of more extra information bits, a new design, called spatial modulation with spatial constellation design (SM-SC), is proposed to extend the size of a spatial constellation diagram in spatial modulation (SM) system by designing the component formation of the transmitted spatial constellation vector (TSV).
Fuchun Huang, Yiju Zhan
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IEEE Transactions on Vehicular Technology, 2008
Spatial modulation (SM) is a recently developed transmission technique that uses multiple antennas. The basic idea is to map a block of information bits to two information carrying units: 1) a symbol that was chosen from a constellation diagram and 2) a unique transmit antenna number that was chosen from a set of transmit antennas.
Raed Mesleh +4 more
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Spatial modulation (SM) is a recently developed transmission technique that uses multiple antennas. The basic idea is to map a block of information bits to two information carrying units: 1) a symbol that was chosen from a constellation diagram and 2) a unique transmit antenna number that was chosen from a set of transmit antennas.
Raed Mesleh +4 more
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ON SPATIAL LYAPUNOV EXPONENTS AND SPATIAL CHAOS
International Journal of Bifurcation and Chaos, 2003In this paper, we investigate the periodic orbits, spatial Lyapunov exponents, and stability of spatially periodic orbits of the general 2D Logistic system [Formula: see text] where a is a real constant and μ is a parameter. The existence of spatial chaos in the sense of Li and Yorke is proved using the Marotto theorem.
Shu Tang Liu, Guanrong Chen
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Spatial Flows and Spatial Patterns
Environment and Planning A: Economy and Space, 1984The misspecification of gravity spatial interaction models has recently been described by the author. The bias in parameter estimates that results from such misspecification appears to produce the ‘map pattern effect’ or ‘spatial structure bias’ in estimated distance-decay parameters.
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