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Author: engineering

Impact Optimization in Trust & Safety – Airbnb Engineering & Data Science – Medium

There have been 500 million Airbnb guest arrivals, with listings in 191 countries around the world. Trust and Safety is key to the success and continued growth of Airbnb’s community. We employ a complex system of defenses to identify and prevent malicious activities like identity theft, account-takeover, harmful content, credit card fraud, and more while preserving a seamless experience for our good users. Our system is equipped with machine learning, experimentation, and analytics, as well as tools that empower our…

To improve drones, researchers study flying insects

Mechanical engineering researchers Mark Jankauski and Erick Johnson converse in their lab, where they conduct experiments to improve the ability to design small, flapping wings. MSU Photo by Adrian Sanchez-Gonzalez. Credit: MSU, Adrian Sanchez-Gonzalez The unmanned aircraft known as drones, used by hobbyists, researchers and industry to take aerial images and perform other tasks, are growing ever more popular—and smaller. But that miniaturization, which has produced drones that fit in a person’s palm, has started to bump into the laws…

A new manufacturing process for aluminum alloys

PNNL’s ShAPE™ process combined with a unique aluminum alloy produced high-strength, high-ductility rods in one single process. Credit: Andrea Starr | Pacific Northwest National Laboratory An advanced manufacturing process to produce nano structured rods and tubes directly from high-performance aluminum alloy powder—in a single step—was recently demonstrated by researchers from the Pacific Northwest National Laboratory. Using a novel Solid Phase Processing approach, the research team eliminated several steps that are required during conventional extrusion processing of aluminum alloy powders, while…

How engagement bias in short-run experiments can blind you to long-run…

Brian Karfunkel | Data Scientist, Experimentation and Metrics Sciences Congratulations, you’ve just finished building a new feature! But is it good? To find out, you launch an experiment: show half the users your new feature and see how they behave compared to the other half. You run this A/B test for a few days (until you get your predetermined sample size) and the feature performs well! You decide to ship it, but just to be sure you run a long-term…

A new force for optical tweezers awakens — ScienceDaily

When studying biological cells using optical tweezers, one main issue is the damage caused to the cell by the tool. Giovanni Volpe, University of Gothenburg, has discovered a new type of force that will greatly reduce the amount of light used by optical tweezers — and improve the study of all kinds of cells and particles. “We call it ‘intra-cavity feedback force’. The basic idea is that, depending on where the particle or cell you want to study is, the…

What is a Virtual Private Network or VPN?

Virtual Private Network or VPN is a program which allows users to create a secure connection to another network over the internet. It creates a safe connection over a less secure network, such as the public internet. It works by utilizing security procedures and tunneling protocols. Simply put, a VPN creates a virtual encrypted tunnel between the user and a remote server operated by a VPN service. In thus creating, all internet traffic is routed through this tunnel, so the…

A device emerges from the fusion of IGZO and ferroelectric-HfO2

(a) Schematic of ferroelectric-HfO2 based FeFET with 3D vertical stack structure for high memory capacity. Poly-silicon is typically used as a channel material. In this work, we propose to use IGZO as a channel material. (b) Schematic illustration of current challenges of poly-silicon channel and possible solution by IGZO channel. Poly-silicon has low mobility in nanometer thickness region and forms low-k interfacial layer which causes voltage loss and charge trapping. As a part of JST PRESTO program, Associate professor Masaharu…

Securing Certificate Issuance using Multipath DCV

This blog post is part of Crypto Week 2019. Trust on the Internet is underpinned by the Public Key Infrastructure (PKI). PKI grants servers the ability to securely serve websites by issuing digital certificates, providing the foundation for encrypted and authentic communication. Certificates make HTTPS encryption possible by using the public key in the certificate to verify server identity. HTTPS is especially important for websites that transmit sensitive data, such as banking credentials or private messages. Thankfully, modern browsers, such…

Cold weather increases the risk of fatal opioid overdoses — ScienceDaily

Cold weather snaps are followed by a marked increase in fatal opioid overdoses, a new study finds. A research team led by Brandon Marshall, an associate professor of epidemiology at Brown University’s School of Public Health, found a 25 percent increase in fatal opioid overdoses after periods of freezing temperatures compared to days with an average temperature of 52 degrees. And while the researchers continue to investigate the reasons for this pattern, Marshall suggests some interventions that could reduce overdose…

Drones for early detection of forest fires

Credit: CC0 Public Domain The UC3M’s researchers coordinating the scientific part of the project, Fernando García y Abdulla al-Kaff, from the Department of Systems Engineering and Automation, have developed the complete automatic flight system, as well as the interface with which the emergency service can access information about what is occurring in real time. “The drone we have developed for the project has a thermal camera, an optical camera, and four sensors which allow us to identify the temperature of…