Abstract: The invention provides for a device that allows real-time feedback to its carrier (person) about the proximity or distance to another person. This feedback could be a friendly tune or some alarm sound pattern, or a visible light source with some color and brightness pattern. A person could for instance alter his behavior by creating more distance from other persons during a pandemic or in other situations where physical distance is desired. The device according to the invention is colloquially referred to as a SOTAR device, being short for “Sound Transponder Rangefinder”.

Abstract: A method of distributing and aggregating resource data, such as transmission capacity. First, for each edge node in the domain a respective spanning tree is constructed that connects said edge node to ail other edge nodes and that identifies for each node other than said edge node in said tree a single upstream neighbour node and zero or more downstream neighbour nodes. Second, any node that has a change in resource data in connection with a particular spanning tree it is a member of, such as the transmission capacity increase or decreases, will send a message to update each of its upstream and downstream neighbour in that spanning tree on said change. Third, each such neighbour will calculate impact of said change to its own resource data and will send a message to update each of its upstream and downstream neighbour in that spanning tree on said impact.

Abstract: A method of distributing and aggregating resource data, such as transmission capacity. First, for each edge node in the domain a respective spanning tree is constructed that connects said edge node to ail other edge nodes and that identifies for each node other than said edge node in said tree a single upstream neighbour node and zero or more downstream neighbour nodes. Second, any node that has a change in resource data in connection with a particular spanning tree it is a member of, such as the transmission capacity increase or decreases, will send a message to update each of its upstream and downstream neighbour in that spanning tree on said change. Third, each such neighbour will calculate impact of said change to its own resource data and will send a message to update each of its upstream and downstream neighbour in that spanning tree on said impact.