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Category: Civil Engineering

Spotify Modernizes Client-Side Architecture to Accelerate Service on All Devices

Engineer Carl Engström explains how lifting the 10,000 limit on Liked Songs enabled his team to address a much deeper issue and improve the listening experience of end users, whatever their device or network.    At first glance, lifting the 10,000 limit on Liked Songs seems like a simple engineering exercise. Some Reddit commentators even claimed to have identified a few lines of code that set the restriction. Why not just delete them and tidy up any gaps? As the…

Keeping Customers Streaming — The Centralized Site Reliability Practice at Netflix

By Hank Jacobs, Senior Site Reliability Engineer on CORE We’re privileged to be in the business of bringing joy to our customers at Netflix. Whether it’s a compelling new series or an innovative product feature, we strive to provide a best-in-class service that people love and can enjoy anytime, anywhere. A key underpinning to keeping our customers happy and streaming is a strong focus on reliability. Reliability, formally speaking, is the ability of a system to function under stated conditions…

How Netflix is able to enrich VPC Flow Logs at Hyper Scale to provide Network Insight

By Hariharan Ananthakrishnan and Angela Ho The Cloud Network Infrastructure that Netflix utilizes today is a large distributed ecosystem that consists of specialized functional tiers and services such as DirectConnect, VPC Peering, Transit Gateways, NAT Gateways, etc. While we strive to keep the ecosystem simple, the inherent nature of leveraging a variety of technologies will lead us to complications and challenges such as: App Dependencies and Data Flow Mappings: Without understanding and having visibility into an application’s dependencies and data…

Automotive Radar Chip Processes 30 Gb/s of Data

Tel Aviv-based Arbe has developed an automotive-grade (AEC-Q100) high-resolution radar chipset designed to help autonomous vehicles, as well as passenger vehicles equipped with advanced driver-assistance systems (ADAS), detect and identify objects. The technology can separate, identify, and track hundreds of objects in high horizontal and vertical resolution at a long range in a wide field of view. Arbe claims its radar chipset generates an image 100 times more detailed than any other solution on the market today. The system is then…

Researcher Designs and Creates New Cloaking Material

Guoliang Huang is the James C. Dowell Professor in the Department of Mechanical and Aerospace Engineering. Stealth technology, the idea of reducing the ability of the enemy to detect an object, has driven advances in military research for decades. Today, aircraft, naval ships and submarines, missiles and satellites are often covered with radar-absorbent material, such as paint, to hide or cloak them from radar, sonar, infrared and other detection methods. A cloak is a coating material that makes an object…

Enabling highways and bridges to prevent their own damage

Luna Lu is investigating unique ways to build artificial intelligence into concrete-paved bridges and highways, enabling them to prevent and repair their own damage. Credit: Purdue University photo/John Underwood Roads always seem to need repairs. Luna Lu is giving concrete the ability to “talk” and even heal itself. Her lab at Purdue University is developing technology that would allow concrete-paved bridges and highways to reveal more accurately when they need repairs and to come equipped with materials that respond to…

Cut Costs and Build Your Own Network Intelligence – Wayfair Tech Blog

Have you ever wanted to be able to simply switch between Internet Service Providers (ISP) dynamically based on network path reliability? Many network engineers will answer yes. This is a common ask in environments of any size.  At Wayfair, we rely heavily on the resilience and reliability of our Internet and WAN circuits, not just for customer traffic, but for VPN connectivity, back-up DIA for other sites and Data Centers, replication between sites, and Cloud connectivity. While vetting solutions, we…

Double helix of masonry—Researchers discover the secret of Italian renaissance domes

The double loxodrome technique is comprised of rows of vertical herringbone bricks that spiral around the dome and are filled in by horizontal field bricks. Effectively, each course of bricks creates a structural element known as a plate-bande or flat arch that wedges interior bricks between the vertical end caps to distribute load throughout the structure. Credit: Vittorio Paris and Attilio Pizzigoni, University of Bergamo; Sigrid Adriaenssens, Princeton University In a collaborative study in this month’s issue of Engineering Structures,…

“Linear” PTC Thermistors Overcome NTC Temperature-Sensing Shortcomings

Download this article in PDF format. There’s increasing demand for ultra-high precision measurements that can achieve greater than 24-bit resolution in industries from aerospace and defense and gas exploration to pharmaceutical and medical-device manufacturers. For example, the pharmaceutical industry uses high-precision lab balances that offer 0.0001-mg resolution over a 2.1-g full-scale range that would require an analog-to-digital converter (ADC) with greater than 24-bit resolution. Calibration and testing of these high-precision systems challenges the instrumentation industry to offer test equipment that…

Network-Layer DDoS Attack Trends for Q1 2020

As we wrapped up the first quarter of 2020, we set out to understand if and how DDoS attack trends have shifted during this unprecedented time of global shelter in place. Since then, traffic levels have increased by over 50% in many countries, but have DDoS attacks increased as well? Traffic increases are often observed during holiday seasons. During holidays, people may spend more time online; whether shopping, ordering food, playing online games or a myriad of other online activities.…