Friday, March 2

Adaptive Brain Interfaces : Seminar Report|PPT|PDF|DOC|Presentation|Free Download

Adaptive Brain Interfaces (ABI) is a part of European Union Information Technology’s ESPRIT programme, with the central aim of extending the capabilities of physically-impaired people to access new services and opportunities. The ABI is a portable brain-computer interface based on the analysis of electroencephalogram (EEG) signals and interface of P300 based speller.

A cap with a few integrated electrodes acquires brain signals that are pre-processed and sent to a computer for further analysis. The portable brain interface has an embedded neural network classifier that recognizes what mental task the wearer is concentrating on. It does so by analyzing continuous variations of EEG signals over several cortical areas of the brain. Each mental task is associated to a simple command. This enables people to communicate using their brain activity, as the interface only requires users to be conscious of their thoughts and to concentrate sufficiently on the mental expression of the commands required to carry out the desired task. So, by composing command sequences (thoughts), the user can read a web page, interact with games, turn on appliances, or even guide a wheelchair. 



Brain interface will be most successful when it is adapted to its owner. The approach is based on a mutual learning process where the user and the ABI interface are coupled together and adapt to each other. The neural network has been specifically designed to cope with the challenging problem of recognizing mental tasks from spontaneous on-line EEG signals. Although the immediate application of ABI is to help physically disabled or impaired people by increasing their independence and facilitating access to the Information Society, the benefits of such a system are extensive. Anyone can use it for other purposes, e.g. health and safety concerns (e.g. monitoring a person's level of alertness). ABI could also contribute to the medical diagnosis of brain disorders.

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Cell Phone Jammer Seminar Abstract


Inside a Cell-phone Jammer

Electronically speaking, cell-phone jammers are very basic devices. The simplest just have an on/off switch and a light that indicates it's on. More complex devices have switches to activate jamming at different frequencies. Components of a jammer include:

Antenna

Every jamming device has an antenna to send the signal. Some are contained within an electrical cabinet. On stronger devices, antennas are external to provide longer range and may be tuned for individual frequencies.

Circuitry

The main electronic components of a jammer are:
• Voltage-controlled oscillator - Generates the radio signal that will interfere with the cell phone signal
• Tuning circuit - Controls the frequency at which the jammer broadcasts its signal by sending a particular voltage to the oscillator
• Noise generator - Produces random electronic output in a specified frequency range to jam the cell-phone network signal (part of the tuning circuit)
• RF amplification (gain stage) - Boosts the power of the radio frequency output to high enough levels to jam a signal
Power supply

Smaller jamming devices are battery operated. Some look like cell phone and use cell-phone batteries. Stronger devices can be plugged into a standard outlet or wired into a vehicle's electrical system.

Alternatives to Jamming

While the law clearly prohibits using a device to actively disrupt a cell-phone signal, there are no rules against passive cell-phone blocking. That means using things like wallpaper or building materials embedded with metal fragments to prevent cell-phone signals from reaching inside or outside the room. Some buildings have designs that block radio signals by accident due to thick concrete walls or a steel skeleton.

Companies are working on devices that control a cell phone but do not "jam the signal." One device sends incoming calls to voicemail and blocks outgoing calls. The argument is that the phone still works, so it is technically not being jammed. It is a legal gray area that has not been ruled on by the FCC as of April 2005.
Cell-phone alerters are available that indicate the presence of a cell-phone signal. These have been used in hospitals where cell-phone signals could interfere with sensitive medical equipment. When a signal is detected, users are asked to turn off their phones.
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