News from Habr

Опционы: расчет одношаговой биномиальной модели. Ликбез для гика, ч. 8

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MihailAndreev @ Habr 2 place · 01/21/2021 08:03 EDT

Это третья часть рассказа про опционы, где мы поговорим про биномиальную модель, риск-нейтральную меру и разберёмся, как рассчитать цену опциона. Читать далее Read more ›

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пост для мотивации: как я инвестирую в акции

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Artem_zin @ Habr 3 place · 01/21/2021 06:53 EDT

дисклеймерэтот документ не является финансовым советом, прост личные мысли по поводу инвестиций, компаний почему я инвестирую в компании, а не крипту/недвиж/крышечки от пива (крипта, недвиж и крышечки у меня, конечно, есть): цель коммерческих компаний — зарабатывать деньги, цель валюты/крышечек — быть средством обмена, а недвиж/etc — заморозить $ где-то вокруг инфляции, ну или как-то так, я инженер, а не экономист, сильно не бейте ¯*(ツ)*/¯ мои принципы инвестирования оч простые: Read... Read more ›

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CRISPR для чайников, или Краткая справка по быстрому редактированию ДНК

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SvetBolgova @ Habr 3 place · 01/21/2021 03:25 EDT

Возможность изменять фрагменты ДНК всегда была святым Граалем биотехнологии и медицины. CRISPR позволяет делать это с невиданной ранее скоростью и эффективностью. Считайте, что биологи раньше работали на пишущей машинке, а благодаря CRISPR в одночасье пересели на MacBook. Не зря открытие этого метода в 2020 году удостоилось Нобелевской премии по химии.Под катом — рассказ о появлении CRISPR, принципах работы и применении в настоящем и будущем. Да, вы все верно поняли, это... Read more ›

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Вам показалось! Все о Perceived Performance

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glebmachine @ Habr · 01/21/2021 01:14 EDT

Перед вами быстрый, удобный и отзывчивый сайт? Возможно, это не результат плодотворной работы множества людей, а всего лишь набор психологических и инженерных трюков, направленных на улучшение Perceived Performance.В большинстве случаев с ростом реальной производительности улучшается и Perceived Performance. А когда реальная производительность не может быть с легкостью увеличена, существует возможность поднять видимую. В своем докладе на Frontend Live 2020 бывший разработчик Avito Frontend Architecture Алек Read more ›

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Espressif IoT Development Framework: 71 Shots in the Foot

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Andrey2008 @ Habr · 01/20/2021 07:49 EDT

One of our readers recommended paying heed to the Espressif IoT Development Framework. He found an error in the project code and asked if the PVS-Studio static analyzer could find it. The analyzer can't detect this specific error so far, but it managed to spot many others. Based on this story and the errors found, we decided to write a classic article about checking an open source project. Enjoy exploring... Read more ›

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[Translation] Creating Node.JS web server application with Express, Typescript, Jest, Swagger, log4js and routing-controllers

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alex_29 @ Habr · 01/20/2021 06:33 EDT

This is a step by step instruction for creating Node.JS web server application with typescript and express. Creating of new web application on Node.JS is is not making often, so the steps how to do it can be forgotten. So this article is a kind of reminder for me and other developers. Also I added in article links to video clips for more clarification. Here I show how to create... Read more ›

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Doing «Data Science» even if you have never heard the words before

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kryma @ Habr · 01/20/2021 04:16 EDT

There’s a lot of talk about machine learning nowadays. A big topic – but, for a lot of people, covered by this terrible layer of mystery. Like black magic – the chosen ones’ art, above the mere mortal for sure. One keeps hearing the words “numpy”, “pandas”, “scikit-learn” - and looking each up produces an equivalent of a three-tome work in documentation.I’d like to shatter some of this mystery today.... Read more ›

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Top 10 Best Voice Chat APIs [2021] for Mobile & Web Apps

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parthiba @ Habr · 01/19/2021 09:57 EDT

Voice calling plays a crucial role in personal and professional communication. Be it a friendly conversation among classmates or a business deal between companies – voice calling has been the most easy, convenient, and affordable way to communicate for decades. Thus, communication corporations and developers have brought in innovative ways to integrate their Application Programming Interfaces (APIs) and invent newer ways of voice communication. Read More Read more ›

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What is one of the most common mistakes beginner developers make

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turSystem @ Habr 2 place · 01/19/2021 03:07 EDT

It may seem that when you are a beginner, you'll do simple things only. No need to learn data structures and algorithms. No need to understand Big O notation, complexity and stuff like that. This couldn't be further away from the truth!In 2008, when I just started learning to program, I spent a lot of time reading books on PHP and MySQL. Months later, when I felt confident, I took... Read more ›

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Ant Design component customization and bundle optimization

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kopivan @ Habr 2 place · 01/18/2021 07:35 EDT

I'm Ivan Kopenkov, a senior front-end developer at Mail.ru Cloud Solutions. In this article, I will tell you about the approaches we have used for the UI library components customization. You will also learn how to significantly decrease bundle size, cutting off all the unnecessary modules Ant Design takes there.In our case, we are making wrappers for original Ant Design components inside the project, changing their appearance, and developing their... Read more ›

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CLIP from OpenAI: what is it and how you can try it out yourself

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fralik @ Habr 1 place · 01/14/2021 08:21 EDT

Neural networks (NN) and computer vision models in particular are known to perform well in specific tasks, but often fail to generalize to tasks they have not been trained on. A model that performs well on a food data may perform poorly on satellite images. A new model from OpenAI named CLIP claims to close this gap by a large margin. The paper Open AI wrote presenting CLIP demonstrates how... Read more ›

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Modern Portable Voice Activity Detector Released

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snakers4 @ Habr 2 place · 01/14/2021 02:09 EDT

Currently, there are hardly any high quality / modern / free / public voice activity detectors except for WebRTC Voice Activity Detector (link). WebRTC though starts to show its age and it suffers from many false positives.Also in some cases it is crucial to be able to anonymize large-scale spoken corpora (i.e. remove personal data). Typically personal data is considered to be private / sensitive if it contains (i) a... Read more ›

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10(+) years in the Labs

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Shapelez @ Habr 3 place · 01/14/2021 01:45 EDT

At the beginning of the year 2021, Qrator Labs is celebrating its 10 year anniversary. On January 19 our company marks the official passing of a formal 10 years longevity mark, entering its second decade of existence. Everything started a little bit earlier - when at the age of 10 Alex saw the Robotron K 1820 - in 2008, when Alexander Lyamin - the founder and CEO of Qrator Labs,... Read more ›

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Flutter 1.22 Launched: Will it be a Gain or Pain for Businesses?

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varunbhagat1 @ Habr · 01/14/2021 01:16 EDT

Flutter with extensive support from iOS14 and Android 11 released its newest version 1.22 in October last year. The release is primarily meant to focus on the fact that Android 11 and iOS14 works great with Flutter. Businesses are still in a dilemma to choose the best cross-platform framework between Flutter and React Native. But with the release of Flutter 1.22, they have realized that Flutter must be the top... Read more ›

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Passcode Data Protection by Using FPGA and Verilog

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art22m @ Habr 1 place · 01/12/2021 10:58 EDT

There are many situations when you need to protect your data, and different tools can be used to do that. For example, a safe. We develop a passcode data protection mechanism by using an FPGA board and Quartus Prime software. It allows demonstrating the basic concepts of a combination lock such as entering data, setting and checking a passcode, and displaying data. Read more Read more ›

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Android interop with SWIG (a guide). From simple to weird. Part 2 — weird

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Alex_Goldberg @ Habr 2 place · 01/11/2021 14:58 EDT

This part covers the use of typemaps, complex & weird cases, and debugging suggestions. This part requires an understanding of Part 1 - usage of SWIG in simple cases.This is a practical Android-first guide, with Android Studio project you can play with. Read more Read more ›

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How to grow as a programmer and software architect

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peshrus @ Habr 2 place · 01/11/2021 06:08 EDT

Hey Habr! I'm Ruslan, a Java programmer with experience in IT of 15 years who still doesn't understand how to grow as a technical specialist in a company. Let's see what to do with that Read more ›

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[Translation] Active Restore: Beginning UEFI development

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Dabudabot @ Habr 1 place · 01/11/2021 01:49 EDT

This is a translation with minor changes from the original post according to advice from comments.Hello, folks! We have studied the boot sequence of the Windows operating system as part of a project from Acronis with students of Innopolis University. You can find more about the project here and there. There was an idea to execute the logic even before the boot sequence of the OS. Therefore, we tried to... Read more ›

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Служба для управления инфраструктурой с помощью Telegram бота или infrabot.io

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AkshinM @ Habr 1 place · 01/08/2021 04:19 EDT

Пятница, закончился рабочий день. Радостный, в преддверии двух дней отдыха, а именно субботы и воскресенья, так же, как и мои коллеги собрался я и пошел домой. Добираться до дома та еще задача, так как в связи с сильным ростом заболевших COVID-19, государством было принято решение внести разного рода ряд ограничений, в том числе и ограничение временной остановки работы метрополитена, соответственно все хлынули к виду общественного транспорта – автобусам. Это в... Read more ›

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Войти в IT после 45-ти

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iiwabor @ Habr 2 place · 01/07/2021 15:29 EDT

Два с половиной года назад я перешел из отрасли автоматизации промышленного оборудования, в которой я проработал почти 25 лет, в сферу банковского IT, разработчиком Java, и достиг (по оценке моего лида) уровня middle ++.Кардинально сменить сферу деятельности в 45 было непростым решением и еще более непростым в реализации, путь был трудным, долгим и на нем пришлось много и часто платить – деньгами, свободным временем и постоянной сложной мозговой активностью. Не... Read more ›

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