Contextual effects are ubiquitous in vision and provide a means for detectors with localized receptive fields to encode global properties of a stimulus. Although the nature of the neural connections is complex, the majority of evidence supports the Gestalt idea of collinearity; interactions are greatest when the target and surround orientations are spatially aligned to form a contour. Here we c...

introduction:landscape structure means the pattern of a landscape, which is determined by its type of use, but also by its structure, i.e. the size, shape, arrangement and distribution of individual landscape elements. for the delineation of these landscape elements, or so-called patches, often land use or land cover units are used. in this context, “‘land cover’ refers to the physical surface ...

In this paper, we study social interactions between two populations of individuals living in a city. Agents consume land and benefit from intraand inter-group social interactions. We show that in equilibrium segregation arises: populations get separated in distinct spatial neighborhoods. Twoand three-district urban structures are characterized. For high population ratios or strong intergroup in...

This research aims to identify the role of network architecture in influencing individual travel behavior using travel survey data from Minneapolis-Saint Paul and Florida (Fort Lauderdale and Miami). Various measures of network structure, compiled from existing sources, are used to quantify roadway networks, and to capture the arrangement and connectivity of nodes and links in the networks and ...

This paper introduces a reliability-based multi-objective design method for spatial truss structures. A multi-objective optimization problem has been defined considering three conflicting objective functions including truss weight, nodal deflection, and failure probability of the entire truss structure with design variables of cross sectional area of the truss members. The failure probability o...

Large data sets of high dimensional objects have become important in applications such as image databases. We present a new hierarchical spatial indexing structure in this paper called the PK-tree, which provides eecient queries, low space overhead and eecient updates. There is a more declarative nature to the deenition of the PK-tree which results in a structure that is unique for a given set ...

We study networks that connect points in geographic space, such as transportation networks and the Internet. We find that there are strong signatures in these networks of topography and use patterns, giving the networks shapes that are quite distinct from one another and from non-geographic networks. We offer an explanation of these differences in terms of the costs and benefits of transportati...

Undoubtedly, public spaces can be considered as an essential factor, which could contribute to urban arrangement, create and maintain a strong local center and enhance the quality of superior environment and the sense of citizenship. Moreover, integrity has always been the most basic structural qualities and one of the key principles of cities. Integrated urban spaces exhibit the integrated str...