公开(公告)号：US10530858B1

公开(公告)日：2020-01-07

申请号：US15863588

申请日：2018-01-05

Applicant: Amazon Technologies, Inc.

Inventor： Ishwardutt Parulkar ,  Jayashree Subramanian

IPC: G06F15/16 ,  H04L29/08 ,  G06F16/27 ,  G06F16/178 ,  H04W84/18

Abstract: A computer system comprises a memory to store instructions and a processor to: generate a list comprising a first entry including an identifier of a first mesh device and a number of neighboring devices that are reachable by the first mesh device over a single-hop path, and a second entry including an identifier of a second mesh device and a number of neighboring devices that are reachable by the second mesh device over a single-hop path; order the initial list in a descending order of the numbers of neighboring devices; determine a replication factor for the digital content item; identify a subset of entries of the ordered list, wherein a number of entries comprised by the subset is equal to the replication factor; and cause a first copy of the digital content item to be stored on the mesh device referenced by the first entry.

公开(公告)号：US11796637B1

公开(公告)日：2023-10-24

申请号：US17016746

申请日：2020-09-10

Applicant: Amazon Technologies, Inc.

Inventor： Kandarp Shah ,  Jayashree Subramanian ,  Pratik Kalpesh Patel ,  Srinath Byregowda ,  James J Wolfe

IPC: G01S7/41 ,  G01S13/42 ,  G06T7/246 ,  G06T7/60

CPC classification number: G01S7/415 ,  G01S7/412 ,  G01S13/42 ,  G06T7/246 ,  G06T7/60 ,  G06T2207/10028 ,  G06T2207/10044 ,  G06T2207/20081 ,  G06T2207/30196

Abstract: Systems and methods for fall detection on uneven surfaces utilizing radar are disclosed. For example, an electronic device may receive reflected energy from surfaces in an environment. Corresponding sensor data associated with an object moving on an uneven surface may be utilized to determine a velocity of the object and a height change of the object. When the velocity indicates that the object has stopped moving toward or away from the sensing device, and the height values indicate a sudden decrease in height, a fall event may be detected.