When users click on poor quality advertisements, there is a hidden cost to the search engine due to the user dissatisfaction (for instance, users are less likely to click on ads in the future). We describe how to incorporate hidden costs into the GSP auction for internet ads such that it is in an advertiser’s self interest to create a user experience that maximizes efficiency.

– A three-layered neural network that optimally self-adjusts the number of hidden layer units is proposed. The network combines two techniques : 1) Unit fusion which enables an efficient pruning of the redundant units. 2) Linear transformations applied to the chosen hidden layer unit pair output and a modified back-propagation training rule for gradual fusion to reduce pruning shocks. The netwo...

The documentation retrieval applications have been influenced by each other and have contributed in the creation of some search culture which is shared between the hidden design assumptions (existing behind) of search interfaces and the user skills. The purpose of this work is to exploit the hidden design assumptions in order to define scenarios that combine concrete features for specific retri...

A number of recent results in the geometric framework have been obtained for nonsingular systems, using the notion of Self Bounded Controlled Invariant Subspace, and of Self Hidden Conditioned Invariant Subspace. The aim of this note is to extend the above mentioned notion of Self Bounded Controlled Invariant Subspace to singular systems, to investigate its dynamical properties and to study its...

In this paper we address the issue of recognizing Farsi handwritten words. Two types of gradient features are extracted from a sliding vertical stripe which sweeps across a word image. These are directional and intensity gradient features. The feature vector extracted from each stripe is then coded using the Self Organizing Map (SOM). In this method each word is modeled using the discrete Hidde...