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aries1988 : simulation   12

A Virtual-Reality Program to Conquer the Fear of Public Speaking | The New Yorker

Glossophobia, the fear of public speaking

He showed me how to use the program to teleport across cavernous halls and land inches away from strangers, where I could admire rogue gray hairs on their heads and fine webs of wrinkles on their slacks. I was drawn to a woman sitting in a middle row of a banquet-hall audience. She appeared to be miserably bored, as if waiting for a train that would never arrive. She had dun-colored hair, worn in a bun that did not suit her. I reached out to touch it. She blinked, and my hands disappeared from view, sinking into the depth of her head. I backed off and marvelled at the sight of my alternate self’s hands, which were covered with barely detectable freckles and hair follicles. Marshall helped me adjust the size to more closely resemble my own.

I styled everyone in the program in casual, just-stopping-by-the-bookstore clothing, adjusted the gender ratio to include more women, and set the audience rudeness level as high as I could. Now everyone assembled was checking their phones, crossing their arms, or yawning theatrically. I spotted kindness on only one face. Ned, as I decided to call him, was a balding man in a gray cardigan. His hopeful eyebrows told me that he’d been through a lot.

Even though I knew that I was alone in my kitchen, in the middle of the day, and that Ned and his rude friends were illusory, my nerves kept tripping me up. A man who was seated near me at a conference table picked at some lint on his trousers, and I lost my footing and had to start the recording over. Again and again, I recited my spiel over a soundtrack of coughing and an occasional unsilenced mobile device. When I made it all the way to the end of my remarks, the crowd granted me a lackluster round of applause.

Thanks to a real-time “heat map” that tracks a user’s visual attention, I could plainly see that my gaze favors the left side of the room. I watched the words “very” and “so” rise faithfully from my mouth like bubbles.

My avatar—who had my round face and slumped posture—appeared during the playbacks. From my position at the edge of the imaginary room, all I could do was watch her ape my body movements and listen to the recording of my speech. The program designates a grade at the end of each playback, factoring in gaze distribution, pace, pauses, reliance on filler words, and hand activity. Five days in, my scores still hovered around seventy per cent. (My dead-fish hands earned consistent fourteens.)

But, in the group settings, Ned was always somewhere to be found, soothing me with a look of compassionate distress.

While the other authors spoke, I located a young woman whose wide eyes and bobbing head suggested a sympathetic soul—a new, real-life Ned. When it was my turn to speak, I focussed on her and stepped into the light.
temoignage  fun  speaking  public  stress  vr  tool  simulation  social  technique  practice  howto  idea  entrepreneurial 
may 2019 by aries1988
A Hybrid Quadcopter for Longer Flights, Quieter Skies
Video from a computational fluid dynamics simulation of the Straight Up Imaging (SUI) Endurance quadcopter hybrid design in forward flight. The video starts with NASA’s novel hybrid design modification from the original configuration, where the front rotors have been undermounted and the back rotors are kept overmounted. The video then shows the vortex wake using the Q-criterion isosurfaces. If you look closely, you can see that the upper surfaces of the blades are blue (lower pressure), and the lower surfaces are red (higher pressure). The difference in pressure is what generates thrust to fly the drone. The hybrid design reduces the rotor wake interactions and yields much better performance. Timothy Sandstrom, NASA/Ames
drone  nasa  simulation  cfd  video 
january 2018 by aries1988
Venus could have been habitable while life evolved on Earth | New Scientist
Grinspoon and his colleagues aren’t the first to imagine Venus as a hospitable world. It’s similar to Earth in size and density, and the fact that the two planets formed close together suggests that their compositions are similar, too. Venus also has an unusually high ratio of deuterium to hydrogen atoms, a sign that it once had water delivered to the surface by comets, as we think happened on Earth.

The most promising of the four Venuses enjoyed moderate temperatures, thick cloud cover and even the occasional light snowfall (

His team discovered ancient rocks and sedimentary formations in the Jishi Gorge, in the upper reaches of the Yellow river, that could only have existed as a result of a cataclysmic flood. They also found evidence of an earthquake and analysed the skeletons of three children killed by it. Together these helped the team establish a timeline of events. (Science,
simulation  planet 
august 2016 by aries1988
A Climate-Modeling Strategy That Won’t Hurt the Climate -
Such machines will need to be more than 100 times faster than today’s most powerful supercomputers, and ironically, such an effort to better understand the threat of climate change could actually contribute to global warming. If such a computer were built using today’s technologies, a so-called exascale computer would consume electricity equivalent to 200,000 homes and might cost $20 million or more annually to operate.
Computer engineers now believe that sometime between 2020 and 2023 is a likely arrival date for the next generation of supercomputers.

“Scientific calculations like weather and climate modeling are generally, inherently inexact,” Dr. Palem said. “We’ve shown that using inexact computation techniques need not degrade the quality of the weather-climate simulation.”

To more accurately predict the long-term impact of climate change will require shrinking the cell size to just a single kilometer. Such a model would require more than 200 million cells and roughly three weeks to compute one simulation of climate change over a century.
supercomputer  climate  simulation  debate 
may 2015 by aries1988
Hyperwall Item 30017 - GEOS-5 Nature Run Collection
Really cool NASA videos here! Impressive simulation of global weather systems
video  earth  simulation  weather 
november 2013 by aries1988
CfA Press Room
One of Arepo's key advantages is the geometry it uses. Previous simulations divided space into a bunch of cubes of fixed size and shape. Arepo uses a grid that flexes and moves in space to match the motions of the underlying gas, stars, dark matter, and dark energy.

The simulations ran on Harvard's Odyssey high-performance supercomputer, using in total 1024 processor cores. This fast machine allowed the scientists to compress 14 billion years into only a few months - an endeavor that would have kept a desktop computer busy for hundreds of years!
simulation  astro 
august 2012 by aries1988

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