Angad Rekhi, a graduate student and an assistant professor of electrical engineering, has developed a wake-up receiver. This wake-up receiver has many potential applications, particularly in designing the next generation of net worked devices, including so called "smart" devices that can communicate directly with one another without human intervention (介入).

    Once attached to a device, a wake-up receiver listens for a unique ultrasonic（超声波）pattern that tells it when to turn the device on. It needs only a very small amount of power to maintain this constant listening, so it still saves energy overall while extending the battery life of the larger device. A well-designed wake-up receiver also allows the device to be turned on from a significant distance.

    Given the increased interest in networked devices, researchers and industry organizations are starting to define what features and techniques will become standard. Regardless of whether this ultrasound wake-up receiver is among these standard designs, it is likely wake-up receivers of some kind will be combined into commercial applications soon.

    By comparison, the ultrasound wake-up receiver requires a battery but has much greater range than the wirelessly powered devices, while still maintaining a long lifetime due to extremely low power draw. These two technologies-wireless power and wake-up receivers-would likely serve different purposes but both indicate at a turning point in devices that make up the Internet of Things.

    "In light of a long-promised future where interconnected, autonomous, widespread and unremarkable technologies make life easier, the networked devices available now, like video doorbells and app-enabled lights, seem like rather slight advances." the researchers said. They believe technologies like theirs could help cross the gap between the Internet of Things as we know it and the Internet of Things at its best-whatever that may be.

    Are you sometimes a little tired and sleepy in the early afternoon? Many people feel this way after lunch. They may think that eating lunch is the cause of the sleepiness. Or, in summer, they may think it is the heat. However, the real reason lies inside their bodies. At that time—about eight hours after you wake up—your body temperature goes down. This is what makes you slow down and feel sleepy. Scientists have tested sleep habits in experiments where there was no night or day. The people in these experiments almost always followed a similar sleeping pattern. They slept for one long period and then for one short period about eight hours later.

    In many parts of the world, people take naps（小憩） in the middle of the day. This is especially true in warmer climates, where the heat makes work difficult in the early afternoon. Researchers are now saying that naps are good for everyone in any climate. A daily nap gives one a more rested body and mind and therefore is good for health in general. In countries where naps are traditional, people often suffer less from problems such as heart disease. Many working people, unfortunately, have no time to take naps. Though doctors may advise taking naps, employers do not allow it! If you do have the chance, however, here are a few tips about making the most of your nap. Remember that the best time to take a nap is about eight hours after you get up. A short sleep too late in the day may only make you feel more tired and sleepy afterward. This can also happen if you sleep for too long. If you do not have enough time, try a short nap—even ten minutes of sleep can be helpful.

Show Biz Summer 2019

Location: Rosewood Center for Family arts

Important Information:

● Tuition paid on the first day of class. No tuition refunds(退款).

● DCT reserves the right to cancel any class; refunds made for cancellation(取消).

● Please accompany student to the first day of class.

● Registration begins one-half hour before class time.

How To Register:

● Mail: fill out the form in this brochure.

● Be sure to list the class and group that you want & the dates.

    John Smith, an office worker, lives in Washington. He inherited (继承) a million dollars when he was 23, but he wasn't happy at all. When his college friends were looking for their jobs, he didn't have to. Jack decided to living a simple life like everyone else. He gave $l0,000 of his money to a charity (慈善)to help poor children live a better life. Today he is 36. He still wears cheap shoes and clothes and drives a small car only, but he is very happy.

    Up to now John has helped some children from poor countries all over the world, by sending them each $200 a month. The money was used for the children's study, food, medicine and clothing. John receives a report each year on the children's progress. They can write to each other, but usually the children do not speak English.

    When John first heard about these children, he wanted to help them. “It was nothing special,” he said. “Until I went to these countries and met the children I was helping, I didn't know anything about their life.” Once John went to meet a little girl in Africa. He said that the meeting was very exciting. "When I met her, I felt very happy." he said. "And I saw that the money was used for a good cause. It brought me happiness. I want to do everything I can to go on helping those children."

    Four books that will inspire you to travel the world

    There's truly nothing like travel when it comes to gaining perspectives and exposing yourself to other cultures. To get you in the adventuring mood, we asked Amazon Senior Editor Chris Schlep to help you come up with a list of books that transport readers to another time and place. Below, see his list of four books that will inspire you to travel the world.

    ITALY: Beautiful Ruins by Jess Walter

    This book by the popular author Jess Walter is a love story that begins on the Italian Coast in the early 60s and eventually concludes in contemporary Hollywood's screen. As the settings shift from Italy to Edinburgh and Los Angeles, you will find yourself longing to go as well. Buy it on Amazon. Price: $28.90

    SEATTLE: Where'd You Go, Bernadette by Maria Semple

    Maria Semple's first novel is not exactly a love story in Seattle, but if you read it, you just might want to come here to see if people are really as self­involved as the characters in her book. What really shines through is the strange storytelling and the laughs. Buy it on Amazon. Price: $26.60

    ENGLAND: Wolf Hall by Hilary Mantel

    You can't travel to Thomas Cromwell's England without a time machine, but reading Mantel's prize­winning novel is the next best thing. It will make you long to see the ancient buildings and green grass of the English countryside, most of which are still there. Buy it on Amazon. Price: $25.10

    NANTUCKET: Here's to Us by Elin Hilderbrand

    Elin Hilderbrand has built a writing career out of writing about her hometown island of Nantucket. Her latest book is Here's to Us, which, perhaps not surprisingly, is a great beach book. Buy it on Amazon. Price: $30.80

Growing up, we are constantly reminded that young people are heavily affected by technology. We are the "antisocial club", those who prefer to text our friends in the same room rather than make eye contact with them. And even though never-ending studies reveal to us the extent of our social media addiction, we should at least consider that it's not only our young people's problem any more.

There's the rise of the Instagram mums, who like to post an abundance of cute baby pictures, share their mom feelings along the way and show their wonderful lifestyles. They are the so-called "Facebook mum generation", a growing group of parents that like to overshare.

While all of this might be fine, and even a little humorous, new research suggests that parents' technology addiction is negatively affecting their children's behavior. According to the study, 40% of mothers and 32% of fathers have admitted having some sort of phone addiction. This has led to a significant fall in verbal interactions within families and even a decline in mothers' encouraging their children.

There is no denying that I get annoyed when receiving the words "I'll be with you soon" from a parent, when all I want to do is ask one question. But, at the same time, every day leaving the room to wait until my father is finished with his "serious business" (Farmville), has now become the norm. Whether you want to escape your disturbing children for a bit, or want to stay up late flicking through Twitter, know that wanting to do all of these is normal. We, your children, know how addictive it can be and how difficult it is to switch off. But before telling us to put our phones away at the table or even worse, listing statistics of how damaging social media can be for us, maybe lead by example, considering how much time you spend on the phone and how this is impacting your children and your relationship with us. Maybe in this way we can work on our addiction together.