They recommended establishment of monitoring networks for hydrogen sulfide and ammonia using many low-cost passive monitors and a lesser number of expensive realtime monitors.
The implementation of routine passive monitoring for large numbers of patients faces many hurdles, including patient acceptance, physician usability, and processing large volumes of data from sensors (Redmond et al. 2014; Muench 2014).
"We've spoken to many experts in the addiction treatment eco-system and concluded there is a need for passive monitoring of the substances this biosensor can detect," added Patrik Schmidle, CEO, CARI Therapeutics.
For more on network monitoring projects etc. (including passive monitoring) see Interesting web sites for Internet Monitoring.
One firm says its "massive passive monitoring" equipment can "capture up to 1bn intercepts a day".
Russia, France and China had urged an immediate shift from intrusive inspections to passive monitoring and verification visits.
"That is a flaw inherent in any passive monitoring system," commented Anne Elliot, a spokeswoman for Nielsen Media Research, the television rating company.
Instead NCSA relies on passive monitoring techniques, making heavy use of ICSI's open-source Bro network security monitor to understand and protect its network.
There are many passive, battery-operated water games that require remote controls.
