منابع مشابه
Evaluation of Updating Methods in Building Blocks Dataset
With the increasing use of spatial data in daily life, the production of this data from diverse information sources with different precision and scales has grown widely. Generating new data requires a great deal of time and money. Therefore, one solution is to reduce costs is to update the old data at different scales using new data (produced on a similar scale). One approach to updating data i...
متن کاملBuilding Blocks and Excluded Sums
Figure 3. The four terms PPij, PSij, SPij, and SSij “wrap around” the excluded center cell i,j to cover the shaded region. Figure 2. The prefix algorithm. The prefix and suffix sums Pi ,Si are computed as cumulative sums starting from the left and from the right. The excluded sum is then Pi–1 + Si+1. If we peel away, layer by layer, the complexities of the fast multipole method, we find that it...
متن کاملSchemata Evolution and Building Blocks
In the light of a recently derived evolution equation for genetic algorithms we consider the schema theorem and the building block hypothesis. We derive a schema theorem based on the concept of effective fitness showing that schemata of higher than average effective fitness receive an exponentially increasing number of trials over time. The equation makes manifest the content of the building bl...
متن کاملComposable Markov Building Blocks
In sensor data management, it is often useful to collect statistics about state changes of an observed phenomenon. The most basic case is to keep track of how often certain transitions, e.g. from state c to d, have occurred. In our research, we consider a discrete state space and timeline. For example, in the above figure, the state space corresponds to actual two-dimensional space and is divid...
متن کاملSpin-torque building blocks.
The discovery of the spin-torque effect has made magnetic nanodevices realistic candidates for active elements of memory devices and applications. Magnetoresistive effects allow the read-out of increasingly small magnetic bits, and the spin torque provides an efficient tool to manipulate - precisely, rapidly and at low energy cost - the magnetic state, which is in turn the central information m...
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ژورنال
عنوان ژورنال: Nature
سال: 2004
ISSN: 0028-0836,1476-4679
DOI: 10.1038/430970a