48 ellular digital packet data (CDPD) [1–3] networks provide wireless data communications services to mobile users by sharing the radio equipment and unused RF channels with Advanced Mobile Phone System (AMPS) networks [6]. Basically, CDPD transmits packet data over idle AMPS channels, and autonomously switches to another channel when the current channel is about to be assigned for voice usage....

background & aim: families of patients with schizophrenia face with stigma as the most challenging psychosocial pressure; due to its negative consequences on mental health of family and important role of family in a treatment of these patients, it is considered as important mental health issues. comparing the effect of in our own voice-family with psychoeducation on stigma in the families of pa...

In recent years have seen rapid progress in the construction of IP-VPN networks by carriers and new services have been born in that climate, enabled by the ability to process data and voice on the same network. As part of this trend, the time is right for the business of outsourcing of carrier telephone services. For this reason, we developed an improved model of IPstage*1) intended for use by ...

As smart phones appeared with their elegant, easy and exciting touch functionality, the use of touch screen devices has been spreading very fast. Beside the previous advantages, smart phones addresses some new challenges for people with disabilities. Most of visually impaired people don’t prefer using touch-screen devices, as these lack the tactile feedback and are visually demanding. However, ...

Over the past two decades, cable television has largely supplanted over-the-air broadcast as a TV distribution medium, at least in most urban and suburban areas. Several years ago, enterprising companies concluded that they could leverage the extremely wide bandwidth of cable TV systems required to deliver broadcast-quality television as a high-speed conduit for broadband data communications. T...