abstract   a cystic acoustic neurinoma almost entirely consists of a cystic component and is a well recognized subtype of acoustic schwannoma. we report a case of a 40-year- old male patient who presented with clinical features of a left cerebello-pontine angle mass lesion and ct scan findings mimicking the diagnosis of an epidermoid cyst. however intraoperative and histopathological findings w...

This paper describes in detail the development and applications of a Virtual Reality Simulator for Visually Impaired People. It makes an auditory representation of the virtual environment, rendering the virtual world entirely through the hearing. The simulator has these main purposes: validation of auditory representation techniques, 3d sensor emulation for environment recognition and hardware ...

The acoustic environment of a typical neonatal intensive care unit (NICU) is very rich and may contain a large number of different sounds, which come either from the equipment or from the human activities taking place in it. There exists a medical concern about the effect of that acoustical environment on preterm infants, since loud sounds or particular sounds may be harmful for their further n...

During an early epoch of development, the brain is highly adaptive to the stimulus environment. Exposing young animals to a particular tone, for example, leads to an enlarged representation of that tone in primary auditory cortex. While the neural effects of simple tonal environments are well characterized, the principles that guide plasticity in more complex acoustic environments remain unclea...

Mercury is the element commonly applied in industry. Because of poisoning properties the monitoring of the mercury vapour concentration in the environment is very important. Mercury forms amalgams in connection with gold that causes a change in the electrical resistance and mass of the gold specimens. This e ect was applied to measure mercury vapour concentration in the environment using surfac...

In Underwater Acoustic Sensor Networks (UASNs) maintaining communication integrity is a significant challenge. This is largely due to the adverse physical properties of the medium of communication. The acoustic properties of an underwater environment change significantly with variations in weather. Despite these variations, the typical environment of an UASN remains highly reverberant and prone...

Underwater acoustic networks have recently emerged as a promising approach for oceanic applications such as exploration and surveillance. This new type of networks differs from terrestrial wireless sensor networks in that the network nodes are powerful and well equipped with many resources for diverse applications in challenging environments. Existing operating systems for terrestrial wireless ...

This paper describes a new technique for training a speech recognition system on inhomogenous training data. The proposed technique , acoustic factorisation, attempts to explicitly model all the factors that affect the acoustic signal. By explicitly modelling all the factors the trained model set may be used in a more flexible fashion than in standard adaptive training schemes. Since an individ...

A novel statistical scheme for the characterization of underwater acoustic signals is tested in a shallow water environment for the classification of the bottom properties. The scheme is using the statistics of the 1-D wavelet coefficients of the transformed signal. For geoacoustic inversions based on optimization procedures, an appropriate norm is defined, based on the Kullback-Leibler diverge...

Acoustic source localization is important to the design and implementation of intelligent environments such as computer-human interaction systems. Different methods for multiple source localization are discussed and compared in this paper. The mathematical model of the method based on SRP-PHAT is presented for multiple sources localization under reverberant conditions. The PHAT are applied to s...