Nand Fun

IELTS Preperation Guide

hza2002@foxmail.com (按点下班) — Wed, 05 Mar 2025 17:08:59 +0800

My 1st IELTS score: Overall 7 (Listening 8, Reading 8, Writing 6, Speaking 5.5)

Summarized my strategies and exam techniques for IELTS preparation.

Ultimate macOS Setup

hza2002@foxmail.com (按点下班) — Thu, 17 Oct 2024 17:08:59 +0800

Rational configuration and efficient functional software, creating a smooth and efficient workflow.

The content will be explained in the order of the configuration. Some parts can be selectively configured according to individual needs.

About

hza2002@foxmail.com (按点下班) — Wed, 25 Sep 2024 01:05:34 +0800

I always try to squeeze in time for work and picking up new skills. Most of these pet projects of mine don’t end up seeing the light of day, to be honest. They are, however, great opportunities to try something in the real world and learn from it.

Owl Keyboard: Assembly

hza2002@foxmail.com (按点下班) — Thu, 15 Aug 2024 01:04:03 +0800

Please note that if you encounter any difficulties during the installation process, please fully utilize your DIY abilities and use various feasible parts.

Switch Socket
#

Please select the corresponding keyboard switch socket according to the selected PCB.

Owl Keyboard: Materials

hza2002@foxmail.com (按点下班) — Wed, 14 Aug 2024 01:04:03 +0800

Please read the guide carefully. If possible, please also refer to other split keyboard construction guides as reference.

PCB
#

Name	Count	Remarks
PCB	2	1.6mm if use 3D printed case
ProMicro	2	nice!nano
Diodes	46	SOD-123 or DO-35
Reset switch	2	365
Battery switch	2	MSK-1102-1.5H
Battery socket	2	PH2.0 2P
Battery	2	3.7V lithium (max size 405070)
PCB sockets	46	Compatible with MX and Gateron low profile, and Kailh choc if using choc version PCB
Key switches	46	Only compatible with MX style
Keycaps	46	1u cap

Previous Next

Optional
#

RGB and Oled
#

Name	Count	Remarks
OLED	2	0.91 inches
SK6812MINI-E	58	Install all lights as they are connected in series

Previous Next

Case
#

General
#

Name	Count	Remarks
Spacer M2 12mm	4	For OLED cover
Screw M2	24	At least 3mm
Rubber feet	ANY	For anti-slip purposes

Owl Keyboard: Overview

hza2002@foxmail.com (按点下班) — Tue, 13 Aug 2024 01:04:03 +0800

Owl (Orthogonal Wireless Layout)

Combines the ergonomic freedom of wireless connectivity with a split keyboard

Design influenced by Lily58, Corne, Sofle and Torn keyboards

Linear Algebra in Imaging

hza2002@foxmail.com (按点下班) — Tue, 10 Jan 2023 12:27:57 +0800

Image is composed of individual pixels, and the essence of image processing is to process these pixels. The correlation between pixels is important information, and it cannot be completely separated, which is also the starting point of many image algorithms. Convolution is a common operation in mathematics. In image processing, it changes the details of the image by performing operations between the image and the convolution kernel. Convolution or filtering operations on images are widely used in various scenarios, such as various filters and convolutional neural networks. This article will explore the knowledge of linear algebra applied in image processing convolution through image filtering.

Introduction to Image Processing
#

Image processing refers to the analysis, processing, and processing of images to meet visual, psychological, or other requirements. Image processing is an application of signal processing in the field of images. Currently, most images are stored in digital form, so in many cases, image processing refers to digital image processing. In addition, processing methods based on optical theory still occupy an important position.

100 Prisoners Problem

hza2002@foxmail.com (按点下班) — Sun, 08 Jan 2023 14:08:24 +0800

The 100 prisoners problem is a counterintuitive problem. It describes a seemingly impossible event: 100 prisoners have a chance to do the same thing, and only when all the prisoners do it can they survive. In fact, there is a reasonable implementation method for this problem to increase its probability by nearly 30 orders of magnitude.

Introduction
#

The 100 prisoners problem is a mathematical problem in probability theory and combinatorics. In this problem, 100 numbered prisoners must find their own numbers in one of 100 drawers in order to survive. The rules state that each prisoner may open only 50 drawers and cannot communicate with other prisoners. Danish computer scientist Peter Bro Miltersen first proposed the problem in 2003. As an upgraded version of this problem, there will be \(2N\) prisoners. Their corresponding \(2N\) number cards are shuffled and placed in \(2N\) drawers. Each prisoner must open at most half of all the drawers and find the corresponding number card for his own number. All prisoners will enter the room separately. The failure of any one prisoner will result in the failure of the entire challenge. What is the maximum probability that the prisoners winning?

Breast Cancer Prediction

hza2002@foxmail.com (按点下班) — Wed, 22 Jun 2022 01:23:48 +0800

Data source: Breast Cancer Prediction Dataset

Introduction
#

Worldwide, breast cancer is the most common type of cancer in women and the second highest in terms of mortality rates.Diagnosis of breast cancer is performed when an abnormal lump is found (from self-examination or x-ray) or a tiny speck of calcium is seen (on an x-ray). After a suspicious lump is found, the doctor will conduct a diagnosis to determine whether it is cancerous and, if so, whether it has spread to other parts of the body.

Jail Deaths In America

hza2002@foxmail.com (按点下班) — Tue, 21 Jun 2022 01:23:48 +0800

Data sources:Jail deaths in America: data and key findings of Dying Inside

It contains data on large prisons with 750 or more prisoners in the United States. In order to ensure that it checked the number of deaths across the country, it also included data on the 10 largest prisons in each state.

Top 50 Most Followed Twitter Accounts

hza2002@foxmail.com (按点下班) — Mon, 20 Jun 2022 01:23:48 +0800

Data source: Top 50 Most Followed Twitter Accounts

Introduction
#

The data lists the top 50 most-followed accounts on Twitter, with each total rounded to the nearest hundred thousand, as well as the profession or activity of each user. Account totals and monthly changes in the ranking were last updated on May 12, 2022.

Carbon Dioxide Emission Estimates

hza2002@foxmail.com (按点下班) — Sun, 19 Jun 2022 01:23:48 +0800

Data source: Carbon Dioxide Emission Estimates

Introduction
#

The data comes from undata. Last updated on November 1, 2021. It contains the total carbon emissions and per capita carbon emissions of various countries in the world for several years.

Nand Fun

IELTS Preperation Guide

Ultimate macOS Setup

About

Owl Keyboard: Assembly

Switch Socket #

Owl Keyboard: Materials

PCB #

Optional #

RGB and Oled #

Case #

General #

Owl Keyboard: Overview

Linear Algebra in Imaging

Introduction to Image Processing #

100 Prisoners Problem

Introduction #

Breast Cancer Prediction

Introduction #

Jail Deaths In America

Top 50 Most Followed Twitter Accounts

Introduction #

Carbon Dioxide Emission Estimates

Introduction #

Switch Socket
#

PCB
#

Optional
#

RGB and Oled
#

Case
#

General
#

Introduction to Image Processing
#

Introduction
#

Introduction
#

Introduction
#

Introduction
#