Random Variables

January 28, 2025 · 2 min read

This article introduces the common distribution functions both continuous and discrete. Besides, the basic knowledge of conditional distribution such as total probability and Bayes’ Theorem is also introduced. The most important part are the Normal Approximation and Poisson Approximation of the Binomial Random Variable.

Repeated Trials

January 28, 2025 · 5 min read

This article is mainly about Bernoulli Trials and its properties.

Probability and Its Axioms

January 27, 2025 · 6 min read

This article is about the probability and its axioms.

Reflections on Trending Topics

January 25, 2025 · 12 min read

一次制造热点帖子引发的思考与总结。

CPU can only see the threads

January 23, 2025 · 12 min read

In python, due to the GIL (Global Interpreter Lock), which is a mutex and ensures only one thread can execute at a time, so the multiple threads parallel execution is not supported under the CPython interpreter. But what about the multiple processes? What is the difference between them? How to choose the right method? Do you know the coroutine? Let’s explore it together.

Go Common Test

January 22, 2025 · 2 min read

The test methods in Go mainly include three types: unit test, benchmark test, and example test.

Go Concurrency and Parallelism

January 22, 2025 · 1 min read

Go Cheatsheet

January 21, 2025 · 13 min read

Video Technology 101

January 20, 2025 · 21 min read

Do you really understand the video technology? What is the frame rate, resolution, bit rate and their relationships? Do you know the parameters p and K in the terminology 1080p and 4K? Do you know how to describe the video quality? What is the Blu-ray Disc on earth? What the difference between the codec such as H.264/AVC, H.265/HEVC, AV1? You may notice the Apple ProRes in apple, so do you really understand what it for? Do you know the HDR and Dolby Vision? So why there are so many tailers such as .mp4, .mkv, .flv, etc?

Now this Video Technology 101 will introduce them to you.

The Main Kind of Message Queue

January 19, 2025 · 12 min read

Message queues are a form of asynchronous service-to-service communication. They are important in enhancing a system’s scalability, reliability, and maintainability.