Rico贾若童的博客

Linux - SSH and X Window System

X Window System, SSH, Static IP

SSH Generate an SSH Key: ssh-keygen -t rsa -b 4096. This will create ~/.ssh/id_rsa and optionally sets a passphrase Copy ssh onto a remote machine: ssh-copy-id username@rem...

Posted by Rico's Nerd Cluster on January 5, 2018

Literature - The Wealthy Barber Notes

Financial Literacy

Roy’s Story “We all felt bad about Roy having to put off his dream of becoming a lawyer, but deep down we knew that he was doing the right thing. You got to be there when your family needs you,...

Posted by Rico's Nerd Cluster on June 5, 2017

Math - Distance Metrics

KL Divergence , Chi-Squared Similarity

Statistical Distance & Divergence Metrics Kullback-Lebler (KL) Divergence Given two distributions, $p(x)$, and $q(x)$, denotes how different $p(x)$ is from $q(x)$, hence it further denotes ho...

Posted by Rico's Nerd Cluster on June 5, 2017

Electronics - General Electronics Notes

Electronics Testing ICT (In-Circuit Testing) ICT is a type of testing performed directly on PCB to check each component for open / short circuits, incorrect part placement. Method: Build a “b...

Posted by Rico's Nerd Cluster on June 4, 2017

Math - Stats Basics Recap

Basic Statistics Concepts, Regression, Distributions, Covariance & Correlation

Basic Statistics Concepts Standard Deviation and Variance Variance of a distribution can be “biased” and “unbiased”. A biased variance is to always underestimate the real bias. $$ \begin{gather*}...

Posted by Rico's Nerd Cluster on June 3, 2017

Electronics - EMF and Eddy Current

Electromotive Force (EMF，电动势) In short, EMF is: 1 changing magnetic field -> induced voltage It’s characterized by the Faraday’s law: \[\begin{gather*} \begin{aligned} & \epsilon = -N \...

Posted by Rico's Nerd Cluster on June 1, 2017

Math - Manifold

Manifold Definitiont A sphere is a manifold. Any two points on a sphere cannot produce another point on the sphere. However, at any point on the sphere, there’s a tangent plane where any two point...

Posted by Rico's Nerd Cluster on February 13, 2017

Math - Multivariate Normal Distribution

PDF, Linear Transformation

PDF “Variate” is basically a synonym to “random variable”. If we have a vector of random variables and we want to find their joint distributution, then we call this “multivariate” distribution. I...

Posted by Rico's Nerd Cluster on February 13, 2017

Math - MAP(Maximum A-Posteriori) and MLE (Maximum Likelihood Estimate)

Likelihood vs Probabilities

Likelihood VS Probabilities Probabilities describe the chances of discrete, mutually-exclusive possible states. These chances should sum up to 1. Likelihoods describe the chances or the plausibili...

Posted by Rico's Nerd Cluster on February 13, 2017

Math - t-SNE

Introduction van der Maaten, Geoff Hinton and Yoshua Bengio came up with “t-SNE” (pronounced as “tee-snee”) to reduce high dimensional data down to low dimensional data, so clusters between data i...

Posted by Rico's Nerd Cluster on February 7, 2017

Rico's Nerd Cluster

Linux - SSH and X Window System

X Window System, SSH, Static IP

Literature - The Wealthy Barber Notes

Financial Literacy

Math - Distance Metrics

KL Divergence , Chi-Squared Similarity

Electronics - General Electronics Notes

Math - Stats Basics Recap

Basic Statistics Concepts, Regression, Distributions, Covariance & Correlation

Electronics - EMF and Eddy Current

Math - Manifold

Math - Multivariate Normal Distribution

PDF, Linear Transformation

Math - MAP(Maximum A-Posteriori) and MLE (Maximum Likelihood Estimate)

Likelihood vs Probabilities

Math - t-SNE

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