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Category: Electronics Engineering

Metal Detection Systems for the Seafood Industry

The Canadian fish and seafood industry is one of the country’s largest food export sectors. Lobster, crab, salmon and shrimp are some of the country’s biggest exports, and a surge in aquaculture has resulted in record industry highs in recent years. Aquaculture’s popularity is not limited to Canada – this global phenomenon has led to an increase in seafood production in recent years as population growth, increased per capita consumption and rising income levels in countries such as China drive…

Managing “Exploding” Big Data | LinkedIn Engineering

The left side of the figure above shows the partitioned tables. A mapper is launched for each pair partition, which will load the hash table slice for member and item features. In the figure above, the logic is shown for a mapper that processes partition 4 of member features and partition 1 of the item features. Thereafter, for each record, we look up the member and item features from the hash tables and score them right away! The code is…

Constructing a Seamless Flow: Meet Uber Engineering’s Developer Experience Team

Behind the scenes, Uber’s Developer Experience (Dev Exp) team empowers our engineers to seamlessly conceptualize, create, and deploy technologies at scale. Located in our San Francisco, Seattle, and Vilnius offices, Dev Exp falls under the larger umbrella of Uber’s Infrastructure group and includes members of Uber’s Information Platform, Engineering Training & Development, and Service & Language Framework teams. This hardworking group of technical writers, educators, and developers supports our engineers through documentation, training courses, build systems, and development frameworks, among…

Tumblr Engineering — Jetpants Integration Testing

Tumblr is a big user of MySQL, and MySQL automation at Tumblr is centered around a tool we built called Jetpants. Jetpants does an incredible job making risky operations safe and reliable, even fairly complex tasks like replacing failed master servers, or splitting a shard. While Jetpants is an incredibly effective and valuable tool for Tumblr’s day-to-day operation, it has remained very difficult to implement a meaningful testing framework. Integration testing at this level is very challenging. In this article…

Engineers test resilient, intelligent infrastructure

Researchers from the Cambridge Centre for Smart Infrastructure and Construction glue fiber-optic sensors to a test pipe in Cornell’s Geotechnical Lifelines Large-Scale Testing Facility. Credit: Cornell University Like many of today’s household devices, modern infrastructure is gaining the ability to collect and exchange valuable data using wireless devices that monitor the health of buildings and bridges, for example, in real time. But wireless systems for underground infrastructure, such as utility pipelines, are much more difficult to test in the field,…

Upgrading Pinterest to HBase 1.2 from 0.94 – Pinterest Engineering – Medium

Tian-Ying Chang | Pinterest tech lead, Storage & Caching HBase is the backbone of several critical services at Pinterest. It serves more than 10 petabytes data at 10M+ QPS. The majority of the traffic is from real-time online requests that require low latency, so it’s critical that clusters are high performing with high availability. In order to get the most out of HBase and ensure the best experience for Pinners, we upgraded our branch from 0.94.26 to version 1.2. However,…

Never Take Pin Numbering For Granted

Our all-things-about-electronics manufacturing standards body, the IPC, specifies the proper numbering order for most components. That’s a pretty nice thing that they do there, but it’s not always enough to prevent layout mishaps. Case in point a line of small PC board mount switches. IPC calls out pin numbering for dual inline components, with pin one on the upper left (at zero degrees rotation), counting down, then over to the bottom right, and counting back up, as in the illustration…

RRULE expansion in Ruby – Square Corner Blog – Medium

On the Square Appointments team, we often need to deal with events that repeat — from simple cases (like a weekly lunch meeting) to more complex ones (like a haircut every other month on the second-to-last Tuesday, except for September 19th). Fortunately, the iCalendar specification provides a compact way to represent all of these cases. The challenge for us is to turn a text RRULE into a set of actual date occurrences that we can use in our application. Given Ruby’s vast…

A fall left a man paralyzed. Now a robotic ‘exoskeleton’ lets him walk again.

CHARLOTTE, N.C. – Five years after he fell while building a treehouse, paralyzing him from the waist down, Scot Mills stood from his chair at Carolinas Rehabilitation last Monday and took a stroll outdoors. He did it while strapped to a robotic “exoskeleton,” a device named after the rigid outer covers that in nature supports and protects insects, spiders and shellfish. Mills, 43, who lives in Rocky Mount, Va., trained twice a week for two months at the Charlotte…