Yuwei's

Keep calm and carry on

Vibration Analysis 1. Time Domain

常用时域特征 峰峰值 平均值 标准差（均方差，Standard Deviation） $\sigma = \mathrm{SD}(X) = \sqrt{\frac{1}{N} \sum\limits^N_{n=1} (x_n - \mu)^2}$ 当$\mu=0$时，标准差等于均方根RMS。 均...

Posted by Yuwei on September 27, 2022

「Note」Structuring Machine Learning Projects

Coursera Deep Learning Specialization -- Course 3

Week 1. Strategies to Hit the Goal 1. Orghogonalization Definition: Orthogonalization is a system design property that ensures that modification of an instruction or an algorithm component does n...

Posted by Yuwei on August 10, 2020

「Note」Improving Deep Neural Networks

Coursera Deep Learning Specialization -- Course 2

Week 1. Hyperparameter tuning, Regularization and Optimization 1. Data Divide all the data into three parts: the training set: to train the NN the develop (dev) set: to tune the model the...

Posted by Yuwei on August 4, 2020

「译」FAQ：流浪猫对鸟类的影响

FAQ: Outdoor Cats and Their Effects on Birds

本文译自康奈尔鸟类学实验室（The Cornell Lab of Ornithology）官网发表的文章：FAQ: Outdoor Cats and Their Effects on Birds 原文中的讨论包括流浪猫和可以进入户外的宠物猫，这里选译了与流浪猫关系最紧密的段落。 康奈尔鸟类实验室是在讨伐猫咪吗1？ 答：完全不是。我们实验室的很多鸟类学家与员工都在家中养猫。...

Posted by Yuwei on July 23, 2020

Tips for Radio Astronomy

Convert Intensity (Jy/beam) to Flux density (Jy) To calculate flux density (Jy) from intensity (Jy/beam) of an extended source: sum up all the pixels divide it by the beam volume, $\Omega_b$...

Posted by Yuwei on July 21, 2020

「Note」Neural Networks and Deep Learning

Coursera Deep Learning Specialization -- Course 1

Hi, Just a quick reminder: this is a quite personalized lecture note and is not meant for recording all the details. Still, hope it can be of help. Comments and corrections are welcomed...

Posted by Yuwei on July 20, 2020

multi-lang test

subtest

中文版 English ver

Posted by yuwei on January 1, 2020

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