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Category: Mechanical Engineering

The Science of Quality Growth

Analyses and A/B testing shows that increasing our Quality Signup rate causes an increase in our long-term engagement rate.   The concept of a custom true-north metric is not unique to LinkedIn. In fact, many other companies have similar measures that serve as their true-north metric for growth. For example, Facebook is known to track users who connect with 10 friends in seven days. Pinterest tracks Weekly Active Repinners. And Slack tracks teams who have sent 2,000 messages. For the…

How Airbnb Democratizes Data Science With Data University

By Jeff Feng, Erin Coffman & Elena Grewal Introduction Data is essential to us at Airbnb. We characterize data as the voice of our users at scale. Thus, data science plays the role of an interpreter — we use data and statistics to understand our users and translate it to a voice that people or machines can understand. We leverage these quantitative insights, paired together with qualitative insights (e.g. in-person user research) to make the best possible decisions for both the business…

Tactile feedback adds ‘muscle sense’ to prosthetic hand

Test subjects were more than twice as likely to correctly discern the size of grasped objects grasped with a prosthetic hand when they received haptic feedback from a simple skin-stretch device on the upper arm. Credit: Jeff Fitlow/Rice University Engineers working to add “muscle sense” to prosthetic limbs found that tactile feedback on the skin allowed blindfolded test subjects to more than double their ability to discern the size of objects grasped with a prosthetic hand. The results will be…

Reflections on Technology in France

My wife and I recently had the privilege of spending a week in southern France, at a conference in the small town of Aurillac (pronounced “AW-ree-ack”).  I say small—27,000 people is about the size of Cleburne, Texas, which is a town I’m somewhat familiar with.  Based on my admittedly very limited and undoubtedly biased observations of what we saw and experienced, I’d like to make some comparisons between the different ways that the French citizens we encountered and Texans have…

New Russian jet takes to air in bid to rival Airbus and Boeing

Russian Prime Minister Dmitry Medvedev in front of the new MC-21 medium-haul jet, which has made a successful test flight, during its roll-out ceremony last June Russia on Sunday held a successful test flight of its new MC-21 medium-haul passenger jet that it hopes will revive its troubled civil aviation industry and challenge giants Airbus and Boeing. The plane, whose prototype was unveiled last June, flew for 30 minutes at a height of 1,000 metres and a speed of 300…

Spinnaker Orchestration – Netflix TechBlog – Medium

Author: Rob Fletcher When the Spinnaker project first started more than two years ago we implemented Orca — Spinnaker’s orchestration engine µservice — using Spring Batch. It wasn’t an entirely unreasonable fit at the time. It gave us atomic, compartmentalized units of work (tasks in a Spinnaker pipeline), retry semantics, the ability to define branching and joining workflows, listeners that could get notified of progress and many other things we needed. However, in the long run, that choice—and our implementation on top of it—imposed…

Jupiter: A high-performance job-matching service | Engineering Blog | Facebook Code

As part of the engineering workflow — writing, editing, testing, and shipping code — we rely on backend services and machines to do a variety of jobs, such as building new packages, installing dependencies, and running tests. At Facebook’s scale, the number and variety of jobs engineers need to execute every day can build up and become a bottleneck in the system. Our goal is to minimize the amount of time engineers spend waiting on machines so that they can…

Join Us at the 10th Annual Hadoop Summit /…

We’re excited to co-host the 10th Annual Hadoop Summit, the leading conference for the Apache Hadoop community, taking place on June 13 – 15 at the San Jose Convention Center. In the last few years, the Hadoop Summit has expanded to cover all things data beyond just Apache Hadoop – such as data science, cloud and operations, IoT and applications – and has been aptly renamed the DataWorks Summit. The three-day program is bursting at the seams! Here are just…

Under the hood: Photo Search | Engineering Blog | Facebook Code

Today, the volume of photos taken by people with smartphone cameras challenges the limits of structured categorization. It is difficult for one person to categorize their own repository of smartphone photos, much less to define a structured taxonomy for everyone’s photos. On Facebook, people share billions of photos every day, making it challenging to scroll backward in time to find photos posted a few days ago, let alone months or years ago. To help people to find the photos they’re…

World’s first demonstration of multicolor 3-D in vivo imaging using ultra-compact Compton camera

The Compton camera only weighs 580g and is palm-sized, making it the world most compact medical gamma-ray detector. Credit: Waseda University As represented by conventional radiograph, radiological images provide only black and white figures in 2D space. The situation is basically the same for Single photon emission tomography (SPECT) and positron emission tomography (PET), which are the two most common molecular imaging techniques used in nuclear medicine. PET is used especially for early cancer and Alzheimer’s disease detection, but radioactive…