Abstract: A location of node i in a network having a plurality of nodes is identified by intersecting regions that are guaranteed to contain the node i with respect the other nodes that are neighbors of the node i and iteratively minimizing the size of the intersection region containing the node i.

Abstract: A location of node i in a network having a plurality of nodes is identified by intersecting regions that are guaranteed to contain the node i with respect the other nodes that are neighbors of the node i and iteratively minimizing the size of the intersection region containing the node i.

Abstract: A location of node i in a network having a plurality of nodes is identified by intersecting regions that are guaranteed to contain the node i with respect the other nodes that are neighbors of the node i and iteratively minimizing the size of the intersection region containing the node i.

Abstract: A functional architecture is provided for decentralizing the authorization function of an access control system that incorporates user carried access devices, such as smart cards, and door controllers that interact so as to make access decisions. Access to individual rooms is guarded by parameters partially carried by the user carried access devices and partially included in the door controllers.

Abstract: A location of node i in a network having a plurality of nodes is identified by intersecting regions that are guaranteed to contain the node i with respect the other nodes that are neighbors of the node i and iteratively minimizing the size of the intersection region containing the node i.

Abstract: An automaton capable of providing an access control decision upon receiving an access control request is produced by processing context based access control policies specified in a formal descriptive language, and by converting the context based access control policies to the automaton.

Abstract: In one embodiment, a system comprises a plurality of nodes. Each node comprises a transceiver to communicate with at least one of the other nodes over a communication medium. Each node has an associated logical, repeating time period, where each time period comprises a first portion in which the respective node is in a listen mode in which the respective node listens on the communication medium and a second portion in which the respective node is an inactive mode in which the respective node is operated in a low-power mode. When a sending node included in the plurality of nodes intends to transmit data via the communication medium to a destination node included in the plurality of nodes, the sending node attempts to transmit the data to the destination node via the communication medium when the destination node is in the listen mode.

Abstract: A small intelligent device has a memory that stores a finite state automaton, an input/output interface that receives an input and provides an output, and a processor. The processor is arranged to receive the input and to traverse the finite state automaton stored in the memory in order to supply the output to the input/output interface. The automaton may be an embodiment of context sensitive and context independent rules that are enforced by the automaton execution logic.

Abstract: A functional architecture is provided for decentralizing the authorization function of an access control system that incorporates user carried access devices, such as smart cards, and door controllers that interact so as to make access decisions. Access to individual rooms is guarded by parameters partially carried by the user carried access devices and partially included in the door controllers.