A great challenge for data mining techniques is the huge space of potential rules which can be generated. If there are tens of thousands of items, then potential rules involving three items number in the trillions. Traditional data mining techniques rely on downward-closed measures such as support to prune the space of rules. However, in many applications, such pruning techniques either do not ...

In this paper, we prove some results on characterization of $varepsilon$-simultaneous approximations of downward sets in vector lattice Banach spaces. Also, we give some results about simultaneous approximations of normal sets.

The purpose of this paper is to further investigate criteria reduction in the set-valued ordered decision system, in which some objects may have more than one value for an attribute with preference-ordered domains. By considering the uncertainty of criteria values in such information system, we define a similarity dominance relation and give the dominance-based rough approximation of the upward...

The problem of downward continuation of the gravity field from the Earth’s surface to the reference ellipsoid arises from the fact that the solution to the boundary value problem for geoid determination without applying Stokes formula is sought in terms of the disturbing potential on the ellipsoid but the gravity observations are only available on the Earth’s surface. Downward continuation is a...

To study the effects of frequency shifts on vowel identification, a high-quality vocoder (STRAIGHT) was used to process a set of vowels in /hVd/ syllables spoken by two adult males, two adult females, and two children. Vowel identification accuracy was reduced when the spectrum envelope was shifted upward by a factor of 2.0, or downward by a factor of 0.6. Upward shifts produced a smaller decli...

Using abstraction in planning does not guarantee an im­ provement in search efficiency; it is possible for an abstract planner to display worse performance than one that does not use abstraction. Analysis and experiments have shown that good abstraction hierarchies have, or are close to having, the downward refinement property, whereby, given that a concrete-level solution exists, every abstrac...

To study the effects of frequency shifts on vowel identification, a high-quality vocoder (STRAIGHT) was used to process a set of vowels in /hVd/ syllables spoken by two adult males, two adult females, and two children. Vowel identification accuracy was reduced when the spectrum envelope was shifted upward by a factor of 2.0, or downward by a factor of 0.6. Upward shifts produced a smaller decli...

Empirical evidence suggests that bank lending rates are downward rigid: banks tend to adjust their more slowly and less completely short-term market decreases than increases. We investigate the macroeconomic consequences of this interest rate rigidity by introducing asymmetric adjustment costs in a macrofinance dynamic stochastic general equilibrium model. Calibrating model euro area economy, w...