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Category: Mechanical Engineering

The invisible power of ‘flutter’—from plane crashes to snoring to free energy

Flapping flags flutter. Credit: withGod/shutterstock.com With the car windows down on the first warm day of spring, the urge is unshakable. You extend your arm into the wind, tracing the city skyline in a natural motion somewhere between swimming and waving. As you move your hand, you alter the flow of the air. The redirected air in turn exerts a force on your hand. Interactions like this – between a fluid flow, like water or air, and a flexible structure…

A Look Behind the AI that Powers LinkedIn’s Feed: Sifting through Billions of Conversations to Create Personalized News Feeds for Hundreds of Millions of Members

Co-authors: Tim Jurka and Pete Davies Overview At LinkedIn, our mission is to connect the world’s professionals to make them more productive and successful. The LinkedIn Feed stands at the center of this global professional community: a place for our members to discover and join the conversations that are happening among their connections, taking place within their groups, and ignited by the Influencers and companies they’re following. Our members post ideas, career news, questions, jobs, and suggestions in an array…

eBPF, Sockets, Hop Distance and manually writing eBPF assembly

A friend gave me an interesting task: extract IP TTL values from TCP connections established by a userspace program. This seemingly simple task quickly exploded into an epic Linux system programming hack. The result code is grossly over engineered, but boy, did we learn plenty in the process! CC BY-SA 2.0 image by Paul Miller Context You may wonder why she wanted to inspect the TTL packet field (formally known as “IP Time To Live (TTL)” in IPv4, or “Hop…

Predicting costly outages with drone analytics

Images of solar panels taken with an infrared thermal-imaging camera. White hot spots mark damaged cells that need replacement. Credit: Northwestern University Lance Li clicks through an endless, uniform sea of purple, pink, and yellow rectangles. He stops and zooms in on a narrow section that’s glowing white. “This hot spot tells us that part of the panel is not performing correctly,” he says. The 2017 Kellogg School of Management graduate is looking at thermal images of a solar…

Dissecting artificial intelligence to better understand the human brain — ScienceDaily

In the natural world, intelligence takes many forms. It could be a bat using echolocation to expertly navigate in the dark, or an octopus quickly adapting its behavior to survive in the deep ocean. Likewise, in the computer science world, multiple forms of artificial intelligence are emerging — different networks each trained to excel in a different task. And as will be presented today at the 25th annual meeting of the Cognitive Neuroscience Society (CNS), cognitive neuroscientists increasingly are using…

Secret management in multi-tenant environments – Pinterest Engineering – Medium

Jeremy Krach | Software engineer, Infrastructure Security Knox, Pinterest’s open-source secret management service, now supports SPIFFE x509 identity documents as an authentication method. This update enables Knox to manage secrets in multi-tenant environments like Kubernetes. Knox is widely used across Pinterest’s infrastructure to provision secrets into production systems. In an environment where one host machine corresponds to one “service” identity, Knox ACLs are completely expressive. However, microservice infrastructures today leverage tools like Docker and Kubernetes to deploy multiple containerized services…

Using Machine Learning to Improve Streaming Quality at Netflix

by Chaitanya Ekanadham One of the common questions we get asked is: “Why do we need machine learning to improve streaming quality?” This is a really important question, especially given the recent hype around machine learning and AI which can lead to instances where we have a “solution in search of a problem.” In this blog post, we describe some of the technical challenges we face for video streaming at Netflix and how statistical models and machine learning techniques can…

Robotic collaboration in timber construction

At Spatial Timber Assemblies, man and machine work together in both the planning and the manufacturing process. Credit: NFS Digital Fabrication / Roman Keller Digitalisation has found its way into timber construction, with entire elements already being fabricated by computer-aided systems. The raw material is cut to size by the machines, but in most cases it still has to be manually assembled to create a plane frame. In the past, this fabrication process came with many geometric restrictions. Under the…

Depth-sensing imaging system can peer through fog

The MIT system was able to resolve images of objects and gauge their depth at a range of 57 centimeters. Credit: Melanie Gonick/MIT MIT researchers have developed a system that can produce images of objects shrouded by fog so thick that human vision can’t penetrate it. It can also gauge the objects’ distance. An inability to handle misty driving conditions has been one of the chief obstacles to the development of autonomous vehicular navigation systems that use visible light, which…

The next step in Facebook’s AI hardware infrastructure | Engineering Blog | Facebook Code

Machine learning drives many aspects of people’s experience on Facebook. We use automatic language translation systems to remove communication barriers and enable people to interact with each other even if they speak different languages. Our image classification systems not only allow people to search for photos of their favorite moments, but also provide an immersive experience for the visually impaired with “talking images” that can be read with your fingertips. We also use machine learning in speech recognition, object and…