Analysis of range queries on spatial (multidimensional) data is both important and challenging. Most previous analysis attempts have made certain simplifying assumptions about the datasets and/or queries to keep the analysis tractable. As a result, they may not be universally applicable. This paper proposes a set of five analysis techniques to estimate the selectivity and number of index nodes ...

Many spatio-temporal applications involve managing and querying moving objects. In such an environment, predictive spatio-temporal queries become an important query class to be processed to capture the nature of moving objects. In this paper, we investigated the problem of selectivity estimation for predictive spatio-temporal queries. We propose a novel histogram technique based on a clustering...

Osteoporosis is a bone pathology inducing an increased fragility of the skeleton. With the lengthening of the duration of life, this pathology is going to concern an increasing population. A better knowledge of the quality of the bone structure can help a best prevention of the fracture risk. The bone mineral density is not the unique factor to determine the quality of the bone structure. The t...

The analytical characteristics of aptamers are comparable with those of antibodies for the development of biosensor technology. However, aptamers offer some crucial advantages over antibodies such as selection capability for a variety of targets, easy synthesis, improved reproducibility and stability, simple modification for immobilization to solid supports and enhanced selectivity. This articl...

In OFDM-based IEEE 802.11 Wireless LANs, adapting the modulation type per sub-carrier to the frequency selectivity of the wireless channel leads to significant performance improvements. To integrate adaptive modulation into IEEE 802.11a/g networks, some minor modifications to the standard are needed in order to acquire the subcarrier gains and signalize the modulation assignments (on a per-pack...