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Category: Electrical Engineering

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…

PCB Assembly Services – Screaming Circuits: No Open Vias in or near pads

The term “via” probably comes from the Latin word meaning “road.” Therefore, open via would essentially mean “open road.” Open roads, here in Oregon sometimes run through open range ranch land. That means that cows have as much right to be on the road as do cars. If you don’t want cows on your PC boards where the BGAs go, don’t leave open vias in your BGA footprint. Don’t do this: Here’s what happens: Your assembled board will likely be…

Research on metamaterials transforms satellite communications

Doug Werner, John L. and Genevieve H. McCain Chair Professor in Electrical Engineering at Penn State (left), and graduate student J. Daniel Binion. Credit: Pennsylvania State University Groundbreaking innovations on antenna technology, based on a collaboration between Lockheed Martin Space and Penn State, are now under consideration for use in the next generation of GPS satellite payloads. Douglas Werner, John L. and Genevieve H. McCain Chair Professor in Electrical Engineering, along with his current and former graduate students, J. Daniel…

Physicists build devices using mineral perovskite — ScienceDaily

When German mineralogist Gustav Rose stood on the slopes of Russia’s Ural Mountains in 1839 and picked up a piece of a previously undiscovered mineral, he had never heard of transistors or diodes or had any concept of how conventional electronics would become an integral part of our daily lives. He couldn’t have anticipated that the rock he held in his hand, which he named “perovskite,” could be a key to revolutionizing electronics as we know them. In 2017, University…

Wayfair Data Science Launches New Video Explainer Series! – Wayfair Tech Blog

Find out about how Wayfair tackles product recommendations in our first installment! Wayfair Data Science is composed of a number of sub-teams, each tackling a different set of specific business challenges. In order to give you a taste of the wide array of people and workstreams we have here on the data science team, we decided to film an explainer series showcasing some of our favorite projects and methods. In each video, one of our data scientists will provide a…