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Category: Mechanical Engineering

Researchers validate optimum composites structure created with additive manufacturing — ScienceDaily

Additive manufacturing built an early following with 3D printers using polymers to create a solid object from a Computer-Aided Design model. The materials used were neat polymers — perfect for a rapid prototype, but not commonly used as structural materials. A new wave of additive manufacturing uses polymer composites that are extruded from a nozzle as an epoxy resin, but reinforced with short, chopped carbon fibers. The fibers make the material stronger, much like rebar in a cement sidewalk. The…

When the diagnostic accuracy of coronary CT angiography matches that of catheter angiography — ScienceDaily

When a patient complains about chest pain, diagnosis will usually involve catheter angiography to evaluate the adequacy of blood supply to the heart. Researchers from Charité — Universitätsmedizin Berlin have now established that, in certain cases, the diagnostic reliability of non-invasive coronary computed tomography (CT) angiography is as good as that of coronary angiography — thereby dispensing with the need for invasive procedures. Results from this research have been published in The BMJ*. Symptoms such as dull chest pain or…

Mizzou Engineering hosts prestigious AmeriMech Symposium

MU Mechanical and Aerospace Engineering Professor Guoliang Huang was instrumental in bringing the event to Columbia, serving as the chair of the local organizing committee and as a member of the conference committee. Mizzou Engineering, in conjunction with the National Academies of Sciences, Engineering and Medicine and the U.S. National Committee on Theoretical and Applied Mechanics, hosted the AmeriMech Symposium: Non-reciprocal and Topological Wave Phenomena in Solids and Fluids recently. AmeriMech Symposia are renowned academic events that “are intended to…

A wearable vibration sensor for accurate voice recognition

Schematic image of the comparison between our device and a reference microphone (Bruel & Kjaer, microphone type 4192, sensitivity of 1 V Pa?1) for voice authentication and voice-controlled applications. Credit: POSTECH A voice-recognition feature can be easily found on mobile phones these days. Oftentimes, we experience an incident where a speech recognition application is activated in the middle of a meeting or a conversation in the office. Sometimes, it is not activated at all regardless of numbers of times we…

🏄‍♀️ Surf’s Up! Preparing for Huge Waves of Traffic via Load Testing

by Serry Park, Arka Ganguli, and Joe Smith. Over 10 million users across the globe rely on Slack everyday to collaborate with their colleagues. As our user base has grown, so has our focus on enhancing the performance of our features and ensuring their ability to perform under load. This was especially true for Enterprise Key Management (EKM), which launched earlier this year for Enterprise Grid customers. EKM allows our most security-conscious customers to use their own keys to encrypt…

Using Causal Inference to Improve the Uber User Experience

This article is the second in our series dedicated to highlighting causal inference methods and their industry applications. Previously, we published an article on mediation modeling, which is one of many methods within the broader category of causal inference. In future articles, we plan on discussing some initiatives at Uber to scale causal inference methods through our platform and tools. At Uber Labs, we apply behavioral science insights and methodologies to help product teams improve the Uber customer experience. One…

Cloudflare’s Ethereum Gateway

Today, we are excited to announce Cloudflare’s Ethereum Gateway, where you can interact with the Ethereum network without installing any additional software on your computer. This is another tool in Cloudflare’s Distributed Web Gateway tool set. Currently, Cloudflare lets you host content on the InterPlanetary File System (IPFS) and access it through your own custom domain. Similarly, the new Ethereum Gateway allows access to the Ethereum network, which you can provision through your custom hostname. This setup makes it possible…

Inside the Entropy

Randomness, randomness everywhere;Nor any verifiable entropy. Generating random outcomes is an essential part of everyday life; from lottery drawings and constructing competitions, to performing deep cryptographic computations. To use randomness, we must have some way to ‘sample’ it. This requires interpreting some natural phenomenon (such as a fair dice roll) as an event that generates some random output. From a computing perspective, we interpret random outputs as bytes that we can then use in algorithms (such as drawing a lottery)…

Creating the “Superclass”: Improving object detection at Wayfair via product class clustering

Executive Summary Object detection is an important component of the computer vision workflow at Wayfair. The goal of object detection is to detect bounding boxes of the objects in an image along with the class information (Figure 1), which empowers many downstream applications. In this post, we will share a novel method we employ at Wayfair to improve the performance of the object detection model we use by making better use of our training data. The underlying idea of this…

No Coding Required: Training Models with Ludwig, Uber’s Open Source Deep Learning Toolbox

Machine learning models perform a diversity of tasks at Uber, from improving our maps to streamlining chat communications and even preventing fraud. In addition to serving a variety of use cases, it is important that we make machine learning as accessible as possible for experts and non-experts alike so it can improve areas across our business. In this spirit, we built Ludwig, an open source, deep learning toolbox built on top of TensorFlow that allows users to train and test…