이야기박스

요새 삼체라는 넷플리스 드라마의 반응이 뜨겁더군요. 제 주변 지인들은 많이 보았는데, 저는 아직 보지 않았습니다. 시작하기가 너무 힘들어요.. 그래도 과거 천문학을 전공했던 사람이라 주변에 아는 척을 하려고 했습니다. 근데 너무 오래되어서 기억이 전혀 나지 않더군요. 적당히 아는 척하려면, 대충 개념이라도 복습해두어야 할 것 같았습니다. 그게 바로 이 포스팅을 시작하게 된 계기입니다. 삼체 문제 (Three Body Problem) 우리가 중고등학교에서 두 물체의 운동을 나타내는 뉴턴 역학을 많이 배웠지요. 하지만 물체가 두 개 이상되면 각 물체의 운동을 나타내는 것은 상당히 어려워집니다. 이를 n-body problem이라고 많이 이야기하는데요. three-body problem은 이 n-body pr..

Brainstorming Have you ever traveled overseas? Where did you visit? What was your purpose of your visit? What did you see? How was it? Before corona pandemic, I sometimes have traveled overseas. Especially I went to Japan often because there is close with my country. And I have been to USA twice. Each travel has taken three months. I was able to stay that long time because I have an aunt and cou..

Brainstorming Have you ever read any literature? What kind of literature work was it? Who wrote it? What was it about? What did you learn from it? I prefer the non-fiction books to the fiction books. Especially I like the non-fiction book, "Guns, Germs, and Steel", written by Jared Mason Diamond. It explain how the europian conquer the africa and the americas at the age of discovery. He said it..

I got feedbacks about preposition and article from previous calling. Today, I try to study about article "the" which is called by "The definite article". We can use it in front of a noun when we believe the listener/reader knows exactly. 1. Already mentioned it. - I will go to a hospital. The hospital is close with my home. 2. There is only one. - The moon has different phases depending on its r..

Brainstorming 1. Have you ever taken any test? When was it? What kind of test was it? How was the result? Except for the tests I took when I was a student, I take tests every time when I move to a company. Because I work as a program developer. The tests include things like coding tests and job interviews. And the tests result is fifty-fifty. I think about that the results depend on how much I d..

cheer My wife has been cheering for LG Twins for a long time. underdog I'm so sad to see an underdog like the Han-hwa Eagles. root for Although I don't like soccer, I'm rooting for South Korea when the match which against Japan has started. visiting team Almost Sport fans think that visiting team has disadvantages for the match. home team The home team wears colorless uniform, such as white, in ..

library card University has replaced student identification cards with library card. identification driver's license I sometimes forget to bring driver's license when I drive. due I had to presentate until the due date, yesterday. keep The weather is very cold, so keep your jacket on. return You should take the receipt when you try to return it.

library card University has replaced student identification cards with library card. identification driver's license I sometimes forget to bring driver's license when I drive. due I had to presentate until the due date, yesterday. keep The weather is very cold, so keep your jacket on. return You should take the receipt when you try to return it.