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Category: Electrical Engineering

Rebuilding the Profile Highlights System at LinkedIn

In this post, we will touch on why we decided to rebuild the backend system that supports this feature, its technological background, how we re-architected it, and the benefits and successes achieved thus far. Motivations for rebuilding the system The initial profile highlights system was built five years ago to support a relatively smaller number of highlights between two members. Started as a proof of concept, the system was built using a monolithic architecture, where all types of highlights were…

Unpacking the Stack and Addressing Complaints about Content

Although we are focused on protecting and optimizing the operation of the Internet, Cloudflare is sometimes the target of complaints or criticism about the content of a very small percentage of the more than thirteen million websites that use our service. Our termination of services to the Daily Stormer website a year and a half ago drew significant attention to our approach to these issues and prompted a lot of thinking on our part.   At the time, Matthew wrote…

Robust approach for minimizing costs in power-distribution networks

Dealing with uncertainty when scheduling power generators Credit: Takayuki Ishizaki, Tokyo Institute of Techology Scientists at Tokyo Institute of Technology have developed a new method for scheduling the activation and deactivation of power generators that minimizes costs and ensures reliability while addressing the issues prevalent in previous methods. Electrical generators have start-up and shut-down times and associated costs. Because multiple generators are generally available at any given time, and they cannot be activated or deactivated quickly, network operators usually schedule…

Approach suppresses spectral cross-talk in dual-band photodetectors — ScienceDaily

A new method developed by Northwestern Engineering’s Manijeh Razeghi has greatly reduced a type of image distortion caused by the presence of spectral cross-talk between dual-band long-wavelength photodetectors. The work opens the door for a new generation of high spectral-contrast infrared imaging devices with applications in medicine, defense and security, planetary sciences, and art preservation. “Dual-band photodetectors offer many benefits in infrared imaging, including higher quality images and more available data for image processing algorithms,” said Razeghi, Walter P. Murphy…

Core technology for ultra-small 3-D image sensor

Figure 1.The manufactured OPA chip. Credit: KAIST A KAIST research team developed a silicon optical phased array (OPA) chip, which can be a core component for three-dimensional image sensors. This research was co-led by Ph.D. candidate Seong-Hwan Kim and Dr. Jong-Bum You from the National Nanofab Center (NNFC). A 3-D image sensor adds distance information to a two-dimensional image, such as a photo, to recognize it as a 3-D image. It plays a vital role in various electronics including autonomous…

Static electricity could charge our electronics

These images show how the surfaces of magnesia (top block) and barium titanate (bottom block) respond when they come into contact with each other. The resulting lattice deformations in each object contributes to the driving force behind the electric charge transfer during friction. Credit: James Chen, University at Buffalo Unhappy with the life of your smartphone battery? Thought so. Help could be on the way from one of the most common, yet poorly understand, forms of power generation: static…

The scalable fabric behind our growing data center network

Dropbox needs its underlying network infrastructure to be reliable, high-performing, cost-effective, and truly scalable. In previous posts we described how the edge network was designed to improve user performance, and how the supporting multi-terabit backbone network spans continents to interconnect edge PoPs and multiple data centers. In this post we describe how we evolved the Dropbox data center network from the legacy chassis based four-post architecture to a scalable multi-tier, quad-plane fabric. Also, we successfully deployed our first fabric at…

MU Engineering team sets new cybersecurity paradigm

The goal of pretense is to focus an attacker’s resources on a quarantined area of the system that isn’t valuable and keeping legitimate users in a safe area of the system. The pretense thus helps in buying time to shore up an intelligent defense of valuable data and resources to deter the attacker to launch more vigorous attacks on valuable data and resource assets. Instead of simply reacting to cyberattacks after they happen, Mizzou Engineering researchers developed a new approach…

Afshaan Mazagonwalla on Bayesian Machine Learning – Wayfair Tech Blog

Welcome back to Wayfair Data Science’s Explainer Series! This week Afshaan Mazagonwalla will be speaking about Bayesian Machine Learning. Wayfair uses Bayesian and Reinforcement Learning based techniques for balancing the exploration – exploitation trade off between new and popular items in ranking products on the website and for recommending sales events in emails. Afshaan works on the Data Science Recommendations team where she builds algorithms for injecting diversity between the products ranked by our reinforcement learning models.  Before joining Wayfair,…

New class of solar cells, using lead-free perovskite materials — ScienceDaily

Lead-based perovskites already gained much attention as promising materials for low-cost and high-efficiency solar cells. However, the intrinsic instability and the toxicity of lead (Pb) have raised serious concerns of the viability of Pb-based perovskites, hindering large-scale commercialization of solar cells and similar devices based on these materials. As an alternative solution, Pb-free perovskites were recently proposed to counter the toxicity of lead-based perovskites, yet it is of little use due to lower efficiencies. A recent study, led by Professor…