ECG is a standard tool to monitor heart function. ECG generated waveforms are used to find patterns of irregularities in cardiac cycles in patients. In many cases, irregularities evolve over an extended period of time that requires continuous monitoring. However, this requires compression of ECG signals. In the past decades, many compression methods have been proposed. In this paper a comparati...

Digital projectors have been steadily becoming smaller and cheaper, and are now used to augment various surfaces with digital information. However, in situations other than the ideal dark room with a perfect white screen we must contend with ambient light and non-uniformity in surface colour, which will reduce the contrast of the output and introduce visible irregularities. Here we present a me...

In this paper, we examine ionospheric plasma depletions (or bubbles) and irregularities observed by photometers and a ground-based receiver of the global positioning system (GPS) both located in Brazil, South America. A simultaneous observation reveals that when the ionospheric plasma becomes depleted, the GPS total electron content decreases and the associated phase fluctuations grow. Statisti...

The Norwegian Mapping Authority operates a network real time kinematic (RTK) system called CPOS, positioning service providing centimeter level accuracy aimed at commercial users, for example, in civil engineering, excavation, and surveying. CPOS is based on multiple Global Navigation Satellite Systems (multi-GNSS) addition to base stations provide correction data. position subject disturbances...