Conclusion Use <MenuFlyoutItem.Icon>​

Reference: MenuFlyoutItem.Icon property

Example

<MenuBar>
    <MenuBarItem Title="File" x:Uid="File">
        <MenuFlyoutItem x:Name="Open" Text="Open" x:Uid="Open">
            <MenuFlyoutItem.Icon>
                <FontIcon Glyph="&#xED25;" FontFamily="Segoe MDL2 Assets" />
            </MenuFlyoutItem.Icon>
            <MenuFlyoutItem.KeyboardAccelerators>
                <KeyboardAccelerator Modifiers="Control" Key="O"/>
            </MenuFlyoutItem.KeyboardAccelerators>

This post summarizes how I've used my My Number Card, obtained in 2018, and what conveniences it has brought. I'll also cover the inconvenient aspects.

Things I've Used It For​

1. Printing Certificates at Convenience Stores
   • Copy of Resident Record
   • Certificate of Income

This is convenient because there's no need to specially visit a city hall (or branch office) and wait in line.

2. Identity Verification
   • Smartphone communication contracts
   • Opening a securities account
   • Opening a bank account
   • Identity verification for "XXXX Pay" services
   • Identity verification for COVID-19 vaccine appointments

In the future, identity verification might become difficult without a My Number Card. Society is becoming less based on trust, so it might be unavoidable. It's good that I don't have to get a driver's license just for ID purposes when I don't drive. Probably about 20% of people are in this situation.

3. Tax Returns (Kakutei Shinkoku)

I just had to enter numbers into the form and submit it. It's convenient, as it can also calculate medical expense deductions.

4. Using it as a Health Insurance Card

It's good not to have to carry my health insurance card, but I've encountered problems several times where it couldn't be used due to bugs in the qualification verification system, so it seems best to carry my physical health insurance card just in case. It's convenient that information on medicines prescribed at pharmacies can be checked on MyNa Portal (especially for people with drug allergies). If I use my health insurance card instead of my Myna Card, will it still calculate medical expenses? I'm not sure about that.

5. Moving-out Notification

Going to the city hall (or branch office) to submit a moving-out notification during the busy period at the end of March is daunting, but you can submit it online using MyNa Portal. The important thing to remember is not to forget the moving-in notification. (By the way, going to a branch office is less crowded than going to the main city/ward office.) It was a hassle to have to reset my My Number PIN when moving in.

6. Smartphone Electronic Certificate

You can load your My Number electronic certificate onto your smartphone. It might be convenient as you can log in to MyNa Portal card-less.

Dissatisfactions​

1. Smartphone App NFC Even though the electronic certificate is on my smartphone, it always requests NFC. It's inconvenient that the app won't open without NFC being enabled, so I hope for improvement.

2. My Number is Written on It Having the My Number written on the My Number Card creates a risk if it's lost. Although misuse is hard to imagine. I wish it were numberless like a credit card.

3. Monochrome Photo The photo embedded in the My Number Card is monochrome. Why wasn't it in color?

4. Troublesome Renewal Due to electronic certificate security, renewals are every 5 years. However, the card's validity period is 10 years. What? It seems it might or might not be improved.

5. Hospitals Where the Card Cannot Be Used It seems the government provides some subsidies, so I hope they will support it.

6. Too Many PIN Types There are four types of PINs. I wish there were just one, but is it difficult due to security? I don't know.

7. Unstylish Card Design I wish it would emulate the design of a radio operator's license.

Probably Misunderstood Things​

There are many off-base criticisms of the My Number Card, so I'll summarize them. Please understand the system before criticizing.

1. Personal Information Linked from the My Number Card is Extracted This is partially correct. The My Number Card itself only contains basic personal information like address, name, gender, and date of birth. It probably contains less information than a driver's license. To view information linked to the My Number Card, you need to open the linked site and authenticate using the My Number Card. Linked information cannot be viewed without the My Number Card and its PIN. Of course, if you write the PIN on the card and then lose it, various pieces of personal information could be extracted. This point is similar to a cash card.

2. The PIN is only 4 digits, and security is weak It's incorrect that security is weak. Consider logging into SNS on a computer; you can log in with an ID and password. On SNS, the ID is easily known, so you can log in if you have the password. No matter how complex the password, it's a single-factor authentication. On the other hand, the My Number Card uses two-factor authentication: possession of the card + knowledge of the PIN. The reason Windows and other systems allow logging in with a PIN is that two-factor authentication (possession + memory) is said to be more secure than single-factor authentication using a complex password.

3. Errors in Health Insurance Card Linkage This is a linkage error by the health insurance association, a human error. The My Number Card is merely a personal authentication mechanism and is not the problem itself. However, there is an argument to be made about how to deal with errors in linkage by health insurance associations. Health insurance information can be checked on MyNa Portal, so it's advisable to check it once.

4. 100% burden at the counter without a My Number Card is outrageous As before, you can receive a refund by processing it through your health insurance association. However, it seems they will introduce a "qualification certificate" system, which defeats the purpose.

Installing Poetry​

Install Poetry using pip. (It's also a good idea to upgrade pip at the same time.)

python -m pip install --upgrade pip
pip install poetry

Creating a Python Project with Poetry​

1. Creating a New Python Project​

To create a new Python project, run poetry new. A Python project template will be generated.

poetry new xxxxxxxx

2. Existing Python Project​

If you already have a Python project, run poetry init to add the necessary configuration files for Poetry.

poetry init

Entering the Poetry Virtual Environment​

Run poetry shell to start a shell in the Poetry virtual environment. You can use the packages added using Poetry.

poetry shell

Adding Packages to Poetry​

You can add dependency packages using poetry add.

poetry add xxxxxxxx

Other Commonly Used Commands​

• poetry list: Displays a list of commands.
• poetry build: Creates packages (.tar.gz, .whl).
• poetry install: Installs dependency packages.
• poetry publish: Publishes created packages to PyPI, etc.
• poetry search: Searches for packages.
• poetry run: Executes commands in the Poetry environment.
• poetry show: Displays available packages.
• poetry update: Executes dependency package updates.

While Twitter and Instagram are major platforms for information dissemination, they are limited by terms of service and regulations, restricting freedom of expression. Returning to a personal website is a viable option. This site is user-friendly as it does not utilize W○X and therefore lacks advertising or promotion.

Design Aspects​

This site is built using the Jekyll framework, and all themes are custom-made. Here, "theme" refers to font sizes, site structure, margins, etc. It also supports responsive design (adapting to various devices like smartphones and PCs) and dark mode. Although it appears simple, the CSS alone amounts to 13.5 KiB. There's a reason for this. A common pitfall in presentations by those unfamiliar with design is the overuse of accent colors, rainbow gradients, or small margins, resulting in a gaudy design. In other words, poorly executed design can actually make things look worse. Therefore, using accent colors sparingly and setting appropriate margins is beneficial. The result of these meticulous efforts is the large amount of CSS. If anyone finds this homepage gaudy, please share your opinion. Personally, I believe a website with a simple design and no unnecessary animations is the best.

Homepage Design​

This homepage is built with Jekyll. Jekyll simplifies web page creation by allowing you to write HTML templates and combine them with Markdown content. Typically, creating web pages would require writing HTML for each one, and modifying them would involve changing each page individually, which is cumbersome. However, using Jekyll makes modifications easier.

Deployment to GitHub Pages​

This site utilizes GitHub Pages. GitHub Pages allows you to publish web pages for free and even set up a custom domain. However, the free tier has limitations, such as only allowing Pages for public repositories. For Jekyll deployment, GitHub Actions are used to generate the web page whenever a push is made. While Jekyll can be configured to generate pages on every push, workflows enable the use of plugins.

Required Technologies​

The technologies necessary to create such a personal site are:

• Jekyll
• HTML
• CSS / Sass
• GitHub
• JavaScript / TypeScript (not essential)

Considering that creating a personal site alone equips you with these skills, I recommend that programming beginners start by creating a personal site.

Functions used​

• byte[] Encoding.UTF8.GetBytes(string) Converts a string to a byte[]
• MD5 MD5.Create() Creates an MD5 instance
• byte[] md5.ComputeHash(byte[]) Generates an MD5 hash from a byte[]

Example​

string str2MD5(string src)
{
   byte[] srcBytes = Encoding.UTF8.GetBytes(src);
   string MD5src;
   using (MD5 md5 = MD5.Create())
   {
       byte[] MD5srcBytes = md5.ComputeHash(srcBytes);
       StringBuilder sb = new();
       for (int i = 0; i < MD5srcBytes.Length; i++)
           sb.Append(MD5srcBytes[i].ToString("x2"));
       MD5src = sb.ToString();
   }
   return MD5src;
}

• Thread: A single execution unit.
• Block: A group of threads (arranged in 3D).
• Grid: A group of blocks (arranged in 3D).

There are limits to the number of threads, blocks, and grids, which can be obtained using the deviceQuery command.

On RTX3080 with CUDA 11.8, the following were:

Maximum number of threads per block:           1024
Max dimension size of a thread block (x,y,z): (1024, 1024, 64)
Max dimension size of a grid size   (x,y,z): (2147483647, 65535, 65535)

In this case:

• The maximum number of threads per block is 1024.
• The block shape must fit within (1024, 1024, 64). That is, if the block shape is (a, b, c), then the following conditions must be met: $abc \leq 1024$ and $a \leq 1024$ and $b \leq 1024$ and $c \leq 64$.
• The grid shape must fit within (2147483647, 65535, 65535). That is, if the grid shape is (d, e, f), then the following conditions must be met: $def \leq 2147483647 \times 65535 \times 65535$ and $d \leq 2147483647$ and $e \leq 65535$ and $f \leq 65535$.

The type used to define grid and block shapes is dim3.

Example Usage

#include <stdio.h>

__global__ void func1(){
   printf("%d, %d, %d\n", threadIdx.x, threadIdx.y, threadIdx.z);
}

__global__ void func2(){
   int i = threadIdx.x + blockDim.x * threadIdx.y + blockDim.x * blockDim.y * threadIdx.z;
   printf("%d\n", i);
}

int main(){
   dim3 grid(1, 1, 1);
   dim3 block(4, 8, 32);

   func1<<<grid, block>>>();
   func2<<<grid, block>>>();
   cudaDeviceSynchronize();
}

Note: If the crate version is different, the functions will also be different.

Add the required crate​

Add the rand crate as a dependency.

cargo add rand

Example program to generate uniformly distributed random numbers​

use rand::Rng;

fn main(){
   let mut rng = rand::thread_rng();

   // Floating-point number
   let r: f64 = rng.gen_range(0.0..10000.0);
   println!("{}", r);

   // Integer
   let r: i32 = rng.gen_range(0..10000);
   println!("{}", r);
}

$ cargo run
   Finished dev [unoptimized + debuginfo] target(s) in 0.00s
    Running `target/debug/test`
9464.07133934519
9606

Example program to generate uniformly distributed random numbers​

use rand::Rng;

fn main(){
   let mut rng = rand::thread_rng();

   let r: f64 = rng.gen();
   println!("{}", r);
}

$ cargo run
  Compiling alg2opt v0.1.0 (/home/hikari/2-opt/alg2opt)
   Finished dev [unoptimized + debuginfo] target(s) in 0.26s
    Running `target/debug/test`
0.34703657185118175

Random numbers following a specified distribution​

use rand::Rng;
use rand::distributions::Uniform;

fn main(){
   let mut rng = rand::thread_rng();

   let r: f64 = rng.sample(Uniform::new(10.0, 15.0));
   println!("{}", r);
}

$ cargo run
  Compiling alg2opt v0.1.0 (/home/hikari/2-opt/alg2opt)
   Finished dev [unoptimized + debuginfo] target(s) in 0.26s
    Running `target/debug/test`
12.13344856630783

Reference​

https://docs.rs/rand/0.8.5/rand/trait.RnG.html [EOL]

I feel like I spend a lot of money on my PC environment, but I don't know exactly how much, so I'm summarizing it here.

PC Main Unit​

Total: 228,820 JPY

Comment: It's not as expensive as I thought (?). Since it's MicroATX, there's almost no expandability. I might have been better off buying ATX without being stingy, especially since I can't add more memory. I usually consume over 20 GiB of memory, so I might want more.

Peripherals​

Total: 133,246 JPY

Other​

Branches (git branch / git checkout)​

Switching Branches​

git checkout <branch_name>

Deleting Branches​

git branch -d <branch_name>

Creating an Empty Branch​

git checkout --orphan=<branch_name>
git reset --hard

Log​

Displaying the Log​

git log --decorate=full --graph --all

Going Back in Time​

# Find the commit ID
git log

git checkout <commit_id>

Going Back from the Past​

git checkout <branch_name>

Undoing Commits (git reset)​

git reset --soft @^