The subject of this paper is the integration of multi-layered Artificial Neural Networks (ANN) with probability density functions such as Gaussian mixtures found in continuous density Hidden Markov Models (HMM). In the first part of this paper we present an ANN/HMM hybrid in which all the parameters of the the system are simultaneously optimized with respect to a single criterion. In the second...

This paper presents a novel frame acquisition design procedure for the forward link of Ka-band satellite systems. Multiand single-dwell procedures are considered for continuous and discontinuous transmission, respectively. To cope with large frequency errors, the detector employs post detection integration and is based on the threshold crossing (TC) criterion. In particular, non coherent and di...

It is well known that a single Leaky Bucket cannot control all characteristics of a source. Especially, controlling burst length and mean rate may be incompatible, while a poor control of any of these characteristics impacts directly networks performances. Given an ATM source, this paper addresses this issue and gives a general approach to choose the \best" Leaky Bucket parameters; the optimali...

We describe a new carrier–sense multiple access (CSMA) protocol for multihop wireless networks, using multiple channels and a distributed channel selection scheme. The proposed protocol divides the available bandwidth intoN channels where the transmitting station selects an appropriate channel for packet transmission. The selection criterion is based on the interference power measurements on th...

The daily predispositions that are cracked for women in single parenthood variable geometry. After the rupture of conjugality or death spouse, abandonment absence a partner, they begin long stage parenthood. This is what creates matrimonial solitude often punctuated by violence, contempt, revolt eyes entourage, but also marked different kinds solidarity. study analyzes problems encountered stat...

In recent years mobile networks have expanded dramatically, compared with other wireless networks. Routing protocols in these networks are designed with the assumption that there is no attacker node, so routing protocols are vulnerable to various attacks in these networks. In this paper, we review the network layer attacks and then we simulate the impact of black hole attack on ad hoc on demand...

Neural networks have played an important role in intelligent medical diagnoses. This paper presents an Improved Constructive Neural Network Ensemble (ICNNE) approach to three medical diagnosis problems. New initial structure of the ensemble, new freezing criterion, and a different error function are presented. Experiment results show that our ICNNE approach performed better for most problems.