Given a spatial expression, or its computational semantic form, how is the expression’s spatial semantics to be allocated lexically, i.e., among entries in the lexicon? In interlingua-based machine translation (MT) research, lexical allocation is the problem of allocating or subdividing a linguistic expression’s full interlingual (IL) structure into the substructures that are lexical IL forms, ...

Solution techniques for location-allocation problems usually are not a part of microcomputer-based geoprocessing systems because of the large volumes of data to process and store and the complexity of algorithms. In this paper, it is shown that processing costs for the most accurate, heuristic, location-allocation algorithm can be drastically reduced by exploiting the spatial structure of locat...

Spatial Database Systems are characterized by large amounts of geometric and geographic data. Query response times in these systems are crucial, since these systems are often used interactively for decision support systems. The Grid file[1] is a well-known spatial access method that has great potential for parallelism, which reduces the response time of spatial queries for time-critical on-line...

In this paper, we propose several power allocation schemes for multi-input multi-output (MIMO) orthogonal frequency division multiplexing (OFDM) transmission based on the minimization of an approximated bit error rate (BER) expression and we evaluate the different solutions via field trial experimentations. The methods illustrated in this paper, serve to allocate power among the different trans...

the complexity of urban systems in our recent world, make it difficult to evaluation and explanation of their changes with traditional and customarily methods. in the past, remote sensing has shown an ability to detect and describe urban growth patterns at different spatial scales. with new remote sensing devices (e.g. ikonos), with innovative image processing techniques and with further develo...

The use of relay nodes to improve the performance of BWA networks has been the subject of intense research activities in recent years. Relay enhanced BWA networks are anticipated to support multimedia traffic (i.e., voice, video, and data traffic). In order to guarantee service to network users, efficient resource distribution is imperative. Wireless multihop networks are characterized by two i...

We present a computational model of multiple object tracking that makes trial-level predictions about the allocation of visual attention and the resulting performance. This model follows the intuition of allocated resources modulating spatial resolution, but it implements it in a specific way that leads to accurate predictions in multiple task manipulations. Experiments on human subjects, guide...

Multisite LandUse Allocation Problem (MLUA) refers to the problem of allocatingmore than one land use type in an area. MLUA problem is one of the truly NP Complete (combinatorial optimization) problems. To cope with this type of problems, intelligent techniques such as genetic algorithms, and simulated annealing, have been used. Research in the area of Spatial Decision Support Systems (SDSS) fo...

A disk-allocation method assigns a disk-id to each unit of spatial data. Allocating spatial data over multiple disks to distribute the I/O cost of query processing uniformly over available disks can tremendously speed up the processing. An allocation method is called perfect for a query set if it balances the I/O load on each disk in processing any query in a query set. Some of the interesting ...