Abstract: A computer-implemented method includes: selecting between a first location tracking technique and a second location tracking technique used to track a user device. The selecting includes: receiving a communications signal emitted from the user device via one or more network devices; selecting the first tracking location technique based on receiving the communications signal; determining that the user device is outside communications range of the one or more network devices; and selecting the second tracking location technique based on the determining that the user device is outside communications range of the one or more network devices. The method further includes monitoring location information of the user device based on the selecting between the first location tracking technique and the second location tracking technique; and storing or outputting the location information.

Abstract: A computer-implemented method, a system that performs the computer-implemented method, and a computer program product that stores instructions to perform the computer-implemented method are disclosed. The computer-implemented includes receiving a device ID and a door ID; retrieving a dynamic set of access rules for the door ID; determining whether the device ID is authorized based on the dynamic set of access rules; outputting an indication indicating that the device ID is authorized to effectuate unlocking or opening of a door associated with the door ID; outputting an indication indicating that the device ID is not authorized to prevent unlocking or opening of the door.

Abstract: Novel 3,2'-spiro(1',3'-thiazolidine) compounds which are transient prodrug forms of known 6- and/or 9-haloglucocorticosteroids are described. The subject prodrugs provide improved delivery of the prior art steroids for therapeutic purposes, particularly in alleviating inflammation, and can be prepared by known methods, for example, by reacting the corresponding 3-keto steroids with a thiazolidine forming reagent such as an L-cysteine alkyl ester.