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An Internet of Things (IoT) network consists of multiple devices with sensor(s), and one or more access points or gateways. These devices monitor and sample targets, such as valuable assets, before transmitting their samples to an access point or the cloud for storage or/and analysis. A critical issue is that devices have limited energy, which constrains their operational lifetime. To this end, researchers have proposed various solutions to extend the lifetime of devices. A popular solution involves optimizing the duty cycle of devices; equivalently, the ratio of their active and inactive/sleep time. Another solution is to employ energy harvesting technologies. Specifically, devices rely on one or more energy sources such as wind, solar or Radio Frequency (RF) signals to power their operations. Apart from energy, another fundamental problem is the limited spectrum shared by devices. This means they must take turns to transmit to a gateway. Equivalently, they need a transmission schedul ....
/PRNewswire/ Women s beauty should never be defined, and "she" should full of possibilities. Most women are not confident enough in themselves and unaware. ....
Laughable. it was just two years ago that china was bragging that they were using microwave weapons on indian border against india. russia sold a testimony to china and in the early 2,000 and china developed their own off of that and called it torch 1. so we know that these exist. in fact, this u.s. patent from 2005 is for a beamed radio frequency energy weapon that can cause cause some of the described side effects. i know the technology that was developed in the former soviet union and that technology, in my mind is perfectly aligned with the type of technology that s needed to deliver targeted repetitively pulse high powered rf energy. ....
A new study conducted by researchers from the University of Massachusetts-Amherst (UMass Amherst) found that 6G, or sixth-generation mobile system standard, could use humans as a power source. In [.] ....