Generating Textual Reports of Scuba Dive Computer Data Funded by the Nuffield Foundation from May 2004 to December 2006
('self-contained underwater breathing apparatus') diving is the most popular
form of underwater sports - every year one million new divers get certified by PADI (Professional
Association of Diving Instructors).
SCUBA divers are vulnerable to decompression illness, a term often used to describe any disease caused by a reduction in ambient pressure. Decompression sickness, more popluarly known as 'the bends' is one such illness. The most widely accepted theory for explaining 'the bends' is 'the nitrogen bubble theory'. According to this theory, because of the extra pressure exerted by water (in addition to the atmospheric pressure) divers' lungs breathe (a mixture of oxygen and nitrogen) from the Scuba air cylinder under increased ambient pressure. As a result more nitrogen gets dissolved in the body tissues. The dissolved nitrogen bubbles through the body when the divers rapidly ascend to the surface just like a fizzy drink bubbles when the cork is rapidly opened (pressure released). These nitrogen bubbles clog at joints causing 'the bends'.
SCUBA divers carry out decompression stops while ascending to the surface to allow their bodies to naturally get rid of the unwanted nitrogen. Divers can also be decompressed in decompression chambers to remove excess Nitrogen. Over the years dive tables have been used to provide guideline information about required decompression times during the ascent of a dive and also about required rest times between two successive dives. When used faithfully these tables help in planning safe dives to avoid 'the bends'.
One of the modern items of diving gear is a dive computer. A dive computer is a sports gadget that is worn on the divers' wrist (looks more like a wrist watch than a computer) to continually monitor their dives. A dive computer continuously records data such as depth and ambient temperature about the dive. It can also generate a dive table on the fly and compare the recorded data against the table data to inform divers about required decompression stops. They therefore ensure that divers are continually informed to perform safe dives.
Dive computers record dive logs which contain time series of dive depth and tissue saturation. These data sets can be useful to
In this project we develop techniques to produce textual (English) reports of dive data recorded by dive computers. The computer generated report will contain the following information
For more information contact Yaji Sripada.