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Category: Construction Engineering

Oregon city approves permit for US’ first all-wood high-rise

This Nov. 15, 2016, file photo shows a piece of cross-laminated timber, or CLT , in Portland, Ore. City officials in Portland have approved a construction permit for the first all-wood high-rise building in the nation. The building uses the new technology called cross-laminated timber that tests have shown can withstand the worst earthquakes. Developers worked with scientists at Portland State University and Oregon State University to prove through testing that the materials meet all building and fire safety codes.…

Drivers bewildered by twisting Chinese interchange

Five suspended levels and cars going in all directions: a new highway interchange is driving motorists to tears, as they find themselves lost in a concrete maze resembling a plate of spaghetti. Five suspended levels and cars going in all directions: a new highway interchange is driving motorists to tears, as they find themselves lost in a concrete maze resembling a plate of spaghetti. After eight years of construction, the Huangjuewan interchange was completed last week on the outskirts of…

A Distributed Simulation Service – Netflix TechBlog – Medium

By Satyajit Thadeshwar, Mayank Agarwal, Sangeeta Narayanan & Kevin Lew Hundreds of models of smart TVs, game consoles, mobile devices, and other video streaming devices get shipped with a Netflix app pre-installed. Before shipping these devices, manufacturers need to have the app certified on their device firmware. Certification involves running a series of tests that validate the behavior of the Netflix app under different positive & negative scenarios, and this process is repeated each time a new model of a…

Flying metal detectors? Navy tests new unmanned mine-detection system

Cory Stephanson, president and CEO of Broadband Discovery Systems, Inc., launches a small quadrotor platform as Dr. Rosemarie Oelrich, scientist, Naval Surface Warfare Center Carderock, uses a handheld Android device to monitor data during the Ship-to-Shore Maneuver Exploration and Experimentation (S2ME2) Advanced Naval Technology Exercise (ANTX) 2017 at Marine Corps Base Camp Pendleton, Calif. Credit: U.S. Navy photo by John F. Williams/Released During a recent technology demonstration at Marine Corps Base Camp Pendleton, Dr. Rosemarie Oelrich and Dr. Cory Stephanson…

Proposed Regulatory Text for New Post-Tensioning OSHA Regulations

The following is an bridged version of the proposed regulatory text for the new post-tensioning OSHA Regulations as reported by Ironworkers.org (Sections #1, 6 and 9 relate to the post-tensioning activities). The controlling contractor shall ensure that the following is provided and maintained: (1)   Adequate access roads into and through the site for the safe delivery and movement of derricks, cranes, trucks, other necessary equipment, and the material to be erected and means and methods for pedestrian and vehicular control.  Exception: …

An Application-Level Edge Cache to Make Slack Scale

Professor Robin Dunbar, when studying Neolithic farming villages and primate troupes in the 90s, theorized that the maximum number of stable relationships we can keep is around 148, known popularly as Dunbar’s number. This upper bound is due to the mental dossier kept on individual’s relationships, but more importantly, the number of cross relationships between everyone else, whose number grows geometrically. Today, your Slack client is the window into your workplace, and teams have grown into the tens of thousands…

Reducing Image File Size at Etsy

Serving images is a critical part of Etsy’s infrastructure. Our sellers depend on displaying clean, visually appealing pictures to showcase their products. Buyers can learn about an item by reading its description, but there’s a tangibility to seeing a picture of that custom necklace, perfectly-styled shirt, or one-of-a-kind handbag you’ve found. Our image infrastructure at its core is simple. Users will upload images, we convert them to jpegs on dedicated processing machines (ImgWriters) and store them in large datastores (Mediastores).…

A viral way to share music when a simple text, meme, or gif isn’t enough

Two hackathon veterans discovered Square’s APIs at the SXSW Hackathon and the infinite possibilities they offer to improve their existing and new apps. Eric King and Damola Omotosho are two old friends who met at Virginia Tech while earning their engineering degrees. After graduation, they both ended up pursuing a master’s degree in engineering before working full-time in tech. While they were off to a strong start in their early careers, they had a desire to shake things up and find…

How Data Science Helps Power Worldwide Delivery of Netflix Content

by Andrew Berglund Have you ever wondered where your video comes from when you watch Netflix? We serve video streams out of our own content delivery network (CDN), called Open Connect, which is tailored to one specific application: delivering internet TV to our members around the world. This system is the cornerstone of every Netflix video experience — serving 100% of our video, over 125 million hours every day, to 100 million members across the globe! In this post, we introduce some…