Spatial databases play a vital role in many applications such as Geographic Information Systems (GIS), Computer Aided Design (CAD), Very-Large-Scale Integration (VLSI) designs, Multimedia Information System (MMIS), and medicine and biological research. Due to their importance, a large body of work has focused on efficiently computing various spatial queries. A proximity based spatial query comp...

The spatial join combines spatial objects from a Cartesian product that satisfy certain geometric attributes. Unfortunately, to validate the operation the actual objects must be compared against each other. The authors discussed a new process for reducing the number of items that have to be retrieved from disk and compared through filtering and approximation. The three step pipeline started by ...

The aim of this study was to examine serial order processing deficits in 21 schizophrenia patients and 16 age- and education-matched healthy controls. In a spatial serial order working memory task, one to four spatial targets were presented in a randomized sequence. Subjects were required to remember the locations and the order in which the targets were presented. Patients showed a marked defic...

Although a number of methods have been proposed to process exact match or range queries in P2P network, very few attention has been paid on spatial query process. In this paper, we propose a triangular topology of P2P network and spatial query processing methods on this topology. Each node maintains a set of pointers to neighbor nodes determined by delaunay triangulation. This triangular networ...

The ability to reason about relations is relevant for many spatial cognitive processes. This can involve: (i) to represent spatial information mentally, (ii) to manipulate the spatial representation, and (iii) to infer new spatial information. Several cognitive theories make assumptions and predictions about the underlying processes. A detailed and systematic overview and analysis of ireliable ...

Geo-textual indices play an important role in spatial keyword querying. The existing geo-textual indices have not been compared systematically under the same experimental framework. This makes it difficult to determine which indexing technique best supports specific functionality. We provide an all-around survey of 12 stateof-the-art geo-textual indices. We propose a benchmark that enables the ...

Nowadays, the database characteristics, such as the huge volume of data, the complexity of the queries, and even the data availability, can demand minutes or hours to process a query. On the other hand, in many cases it may be enough to the user to get a fast approximate answer, since it has the desired precision. The challenge to give to the user an exact query answer within a reasonable time ...

Two experiments investigated the generality of the selective interference phenomenon by studying several different concurrent tasks, each involving either verbal or spatial information, and a range of retention intervals from 10 to 30 sec. The results supported the selective interference predictions, since the interference in performance was greater when the two simultaneous tasks both involved...

Spatial network queries often have performance bound by the structure and size of the underlying network. This paper discusses methods of improving the performance of these queries, specifically those using network expansion algorithms, by creating a graph representation of the network and removing unnecessary nodes and edges. In addition, two methods of storing and accessing the graph are comp...

We investigated whether vertical-shear disparity was extracted from the whole visual field or from a more local area and how global estimates of vertical disparity are derived. We also investigated the role of cyclovergence in processing shear disparity. Random-dot stereoscopic displays in various configurations were presented with horizontal-shear disparity, vertical-shear disparity or same-si...