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Mobile optical communications has so far largely been limited to short ranges of about ten meters, since the highly directional nature of optical transmissions would require costly mechanical steering mechanisms. Advances in CCD and CMOS imaging technology along with the advent of visible and infrared (IR) light sources such as (light emitting diode) LED(More)
Cameras have become commonplace in phones, laptops, music-players and handheld games. Similarly, light emitting displays are prevalent in the form of electronic bill-boards, televisions, computer monitors, and hand-held devices. The prevalence of cameras and displays in our society creates a novel opportunity to build camera-based optical wireless(More)
The inherent limitations in RF spectrum availability and susceptibility to interference make it difficult to meet the reliability required for automotive safety applications. To address this challenge, this work explores an alternative communication system called Visual MIMO that uses light emitting arrays as transmitters and cameras as receivers. Visual(More)
We propose a rate adaptation scheme for visual MIMO camera-based communications, wherein parallel data transmissions from light emitting arrays are received by multiple receive elements of a CCD/CMOS camera image sensor. Unlike RF MIMO, multipath fading is negligible in the visual MIMO channel. Instead, the channel is largely dependent on receiver(More)
The existence and importance of free radicals are well established both theoretically and in in vivo experiments. Methods and techniques are now available to demonstrate the formation of free radical metabolites of natural substances and xenobiotics. Theories of the biological effects of free radicals could be unified and used for a better understanding of(More)
Prior to the development of effective antiretroviral therapy, persons diagnosed with HIV thought they were going to die. Now, long-term survivors are contemplating death again as they age and develop other chronic diseases. The purpose of our study was to understand the experiences of adults living with HIV for 20 or more years as they faced death for a(More)
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