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Wearable devices that integrate multiple sensors, processors, and communication technologies have the potential to transform mobile health for remote monitoring of health parameters. However, the small form factor of the wearable devices limits the battery size and operating lifetime. As a result, the devices require frequent recharging, which has limited their widespread adoption. Energy harvesting has emerged as an effective method towards sustainable operation of wearable devices. Unfortunately, energy harvesting alone is not sufficient to fulfill the energy requirements of wearable devices. This paper studies the novel problem of adaptive energy management towards the goal of self-sustainable wearables by using harvested energy to supplement the battery energy and to reduce manual recharging by users. To solve this problem, we propose a principled algorithm referred as AdaEM. There are two key ideas behind AdaEM. First, it uses machine learning (ML) methods to learn predictive models of user activity and energy usage patterns. These models allow us to estimate the potential of energy harvesting in a day as a function of the user activities. Second, it reasons about the uncertainty in predictions and estimations from the ML models to optimize the energy management decisions using a dynamic robust optimization (DyRO) formulation. We propose a light-weight solution for DyRO to meet the practical needs of deployment. We validate the AdaEM approach on a wearable device prototype consisting of solar and motion energy harvesting using real-world data of user activities. Experiments show that AdaEM achieves solutions that are within 5% of the optimal with less than 0.005% execution time and energy overhead.
Of course, the year when many media outlets and companies decide to skip on attending CES in person, Sony decides this is the year to make some news at its press conference. While we got more news on its EV plans, and next-gen TVs, Tom Holland was also drafted into the showcase to promote the forthcoming Uncharted feature film. Then it hit us with a barrage of specs for the highly anticipated next-gen PlayStation VR headset. It will, of course, be compatible with the PS5 and the VR2 Sense controllers we've already seen. It will have a display resolution of 2,000 x 2,040 pixel per eye, a 110-degree field of view, and be capable of 90 to 120Hz frame rates, all while supporting 4K HDR.
CES 2022 will put the spotlight on electric vehicles, digital health, the metaverse and other hot technologies when the trade show officially opens on Wednesday. But the resurgent Covid-19 pandemic threatens to overshadow the innovations on display. CES 2022 officially runs Jan. 5-7, but preshow media events begin on Monday. The upcoming show will be a hybrid event with an in-person conference in Las Vegas along with an online component for those who can't attend the physical show. On Friday, organizers shortened the physical show by one day.
South Korean scientists have developed a flexible battery that bends and stretches like a snake, an innovation that could find application in advanced wearable devices and soft robots used in disaster management. Engineers from the Korea Institute of Machinery and Materials (KIMM) said the battery's structure draws inspiration from snake scales, which while rigid, can fold together to protect against external impact, and also possess traits that allow them to be highly stretchable and move flexibly. The stretchable device, described in the journal Soft Robotics, enables flexible movement by connecting several small, hard batteries in a scale-like structure. It consists of small, hexagonal battery cells resembling a snake scale which are connected together using a hinge mechanism made of a polymer and copper material to fold and unfold. "This study proposes a novel structure with individual, overlapping units, similar to snake scales that can be used to construct shape-morphing batteries for untethered soft robots," the scientists wrote in the study.
SAVE $60: Get the Ring Video Doorbell 3 for just $139.99 through Nov. 4. Just because you're home all day doesn't mean you should skimp on home security. Video doorbells can help you with package deliveries, visitors, and keep your home safe and secure. Plus, it's a perfect product to let you get started on your dream smart home. The Ring Video Doorbell 3 is on sale in Best Buy's early Black Friday Deal for its Prime Day price of $139.99.
Amazon-owned Ring has unleashed a few upgraded versions of the six-year-old Ring Video Doorbell over the years, including the $230 Video Doorbell 3 Plus that went on sale in April, yet the original $100 Ring Video Doorbell has remained on sale as a budget option. Now comes word that the $100 model is finally getting its own update. Available for pre-order now and slated to ship on June 3, the second-generation Ring Video DoorbellRemove non-product link will keep the original's $100 price tag while adding new features such as improved video resolution, privacy zones, an additional "near" motion zone, and more. Starting with the basics, the revamped Ring Video Doorbell boosts its video resolution to 1080p, versus 720p for the first-generation model, along with "crisper" night vision and "improved" two-way audio quality. The new Video Doorbell features "privacy zones" that let you specify areas in the camera's 155-degree field of view that you don't want recorded or displayed in the Ring App's live view, while an additional "near zone" allows for motion detection in areas that are between five and 15 feet in front of your home.
The Ring Video Doorbell 2 adds the convenience of a front-door intercom to pretty much any home, and with minimal DIY skills required, meaning it's never been easier to get rid of doorsteppers. There have long been wifi-connected doorbells, for those envious of flat-dwelling friends with video intercoms adding that extra barrier between them and the outside world, but most of them require some sort of wiring to install. The Ring Video Doorbell 2 has a rechargeable battery, which means there's no need to wire it into the mains or a low voltage circuit. But is a rechargeable video doorbell actually any good? The Ring Video Doorbell 2 is essentially a big battery-powered doorbell with a camera in the top of it, which video calls your phone or tablet when someone presses the button.