Kazulog | Page 3 | Gruffly describes topics related to entrepreneurship, development, and IT

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[MBTI] Can Typology and Minutism Coexist? What is the true self?

By intertwining the MBTI's personality typing system with the 'bifurcationism' advocated by Keiichiro Hirano, I would like to discuss whether the 'true self' exists? I would like to discuss the following. Jung's typology proposed that 'one's mental energy is more focused on which world, internal or external, and how one perceives and judges information'.

2024.05.26 2026.02.18

[AI vs. children who cannot read textbooks] Basic reading comprehension has nothing to do with the amount of reading!

Without basic reading comprehension skills, not only in Japanese, but also in all subjects such as arithmetic, social studies and science, it is impossible to solve a text because it is impossible to grasp the text in the first place. Basic reading comprehension skills are not only necessary for children, but also for adults in their work, but shockingly, there was no positive correlation with the amount of reading.

2024.05.04 2026.02.18

Note/Bookraising children

[Mac]Trade in your Intel Mac for an M3 Pro MacBook Pro 14-inch

I have decided to purchase a MacBook Pro 14" M3 Max. Since I will be using it for programming, the Pro looks better than the MacBook Air. As for the size, 14" seems to be fine for dual display. I don't need a chip to M3 Max because I don't do advanced image editing.

2024.06.15 2026.02.18

Note/Booklifehack

[Mia Shipping] Trying to optimize box size and shipping costs.

Until now, we have been dealing with intangible software products such as SaaS and apps, so we did not have to worry about delivery and packaging, but this is our first tangible product, so we have to think about packaging size and shipping costs. Trial and error with Yamato's web pick-up service and Japan Post.

2024.08.01 2026.02.18

EntrepreneurMia

Inspired by my uncle, I tried a no-salt, no-sugar diet.

My uncle, Shoichiro Nakao, is a cardiologist, and after studying at Harvard Medical School, in 1995, he published a paper in the medical journal NEJM on Cardiac Fabry Disease, which was published from Japan to the world, and he is an amazing person. There is probably only one person in Japan who is so strictly salt-free and sugar-free.

2024.07.10 2026.02.17

[Book Review] Super-introduction: The Theory of Relativity What did Einstein think?

I was interested in Einstein's theory of relativity, but had never read it before, so I started with a very introductory reading book. It was biting and explained in a way that I could understand if I understood middle school and high school physics level. The process of law unification from Newton to Maxwell to Einstein

2024.12.15 2026.02.16

(somebody's) sideNote/Book

What is the Grand Unified Theory of the Brain, the Free Energy Principle?

I had been interested in this book, but it had been piled up in my reading pile, so I finally finished it this time. I found the book interesting in its perspective of trying to unify seemingly disparate brain activities such as sensation, movement, emotion, and mental illness from the perspective of free energy.

2024.12.15 2026.02.16

(somebody's) sideNote/Book

[Electronic Circuit] Created a self-made board for bidirectional audio with ESP32+SPH0645LM4H-B (I2S) and placed an order with Elecrow.

How to use SPH0645LM4H-B as a replacement I2S mic for INMP441, wire with ESP32 to make my own board and order from Elecrow. is Elecrow cheaper PCBA cost compared to JLCPCB?

Development/Designelectronic circuit

I tried to make my own board with INMP441 added to ESP32, but INMP441 is out of stock?

I tried to make my own ESP32 board using INMP441 to develop interactive voice for “Mia,” a cat-shaped robot, but the parts were unexpectedly out of stock.

2025.04.16 2025.04.20

Development/Designelectronic circuit

[Rails] RSpec memorandum: describe / context / it / subject / let / let!

This presentation explains how memoization works when using subject in RSpec and the pitfalls of update tests, including why calling subject before does not reflect parameter changes, the correct timing of evaluation, and best practices for test design with concrete examples.

Development/DesignServer (Go/Rails)

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