Profile

Cover photo
Wongoo Lee
Works at Google Inc.
Attended 인하대학교
Lives in Sunnyvale
1,483 followers|2,069,243 views
AboutPostsCollectionsPhotosYouTubeReviews

Stream

Wongoo Lee

Shared publicly  - 
 
여기 시간으로 오늘 저녁이군요
 ·  Translate
1
Wongoo Lee's profile photo
Add a comment...

Wongoo Lee

Shared publicly  - 
 
Gravity Falls 끝나버렸네요 ㅠㅠ
 ·  Translate
1
Add a comment...

Wongoo Lee

Shared publicly  - 
 
디스크에 보관하던 사진들 잘 못 될까봐 2중 3중 백업하고 있었는데 한달 1-2불이면 걱정 끝일 듯.
한달 1GB 보관에 1센트, 다운로드 1GB에 1센트.
 ·  Translate
 
Ah yes. With GCP's nearline storage (https://cloud.google.com/storage-nearline/) you get "glacier" at-rest pricing but with the same API as regular storage, 3-second restore, and rational restore pricing.
In late 2012, I decided that it was time for my last remaining music CDs to go. Between MacBook Airs and the just-introd…
1 comment on original post
1
Wongoo Lee's profile photo
 
제가 얘기한 서비스는 이거임. https://cloud.google.com/storage-nearline/
 ·  Translate
Add a comment...

Wongoo Lee

Shared publicly  - 
 
나도 받고 싶다.
 ·  Translate
Imgur: The most awesome images on the Internet.
3
soyoung lee's profile photoWongoo Lee's profile photo
2 comments
 
ㅋㅋ
Add a comment...

Wongoo Lee

Shared publicly  - 
 
그렇다고 합니다.
 ·  Translate
1
Add a comment...

Wongoo Lee

Shared publicly  - 
 
광고없는 유튜브는 생각보다 훨씬 쾌적합니다. 그리고 구글뮤직이랑 번들이에요.

 ·  Translate
3
1
Wongoo Lee's profile photoJiho Han's profile photo
3 comments
 
저도 건강합니다.  (이거 영화 러브레터의 대사 같군요;; )
 ·  Translate
Add a comment...

Wongoo Lee

Shared publicly  - 
 
 
This deserves a Nobel prize

This is a picture of Super-Kamiokande, one of the neutrino detectors that won this year's physics Nobel prize.   It's a tank buried 1 kilometer deep in a mine.   The tank holds 50,000 tons of ultra-pure water, surrounded by 11,146 machines that can detect tiny flashes of light.  When a neutrino zipping through space happens to hit a water molecule, it makes a flash of light --- and Super-Kamiokande records it.

Here you see some people on a raft working on the detectors.  The winners of the Nobel prize were Takaaki Kajita and Arthur B. McDonald, who worked at another neutrino detector in Canada.   But these big experiments involve huge teams of people! 

These teams, and their machines, deserve a Nobel prize because they proved something we'd begun to suspect much earlier.

There are 3 different kinds of neutrinos: electron, muon and tau neutrinos.  Nuclear fusion in the Sun makes electron neutrinos... but we saw only about 1/3 as many as expected.  This made physicists suspect that electron neutrinos were turning into the other 2 kinds of neutrinos as they went from the Sun to Earth. 

But proving this was very hard.  And it's only possible if neutrinos have mass! 

You see, time doesn't pass for a massless particle, since special relativity says time slows down for you when you're moving fast, and it comes to a halt if you're moving at the speed of light.  So, a massless particle can't turn into something else until it hits another particle.

As early as the 1950s we knew that neutrinos were almost massless.  So, we thought they were massless.  But now, thanks to these experiments, we know neutrinos really do change from one kind into another.  So, we know they have a tiny but nonzero mass.

Here's what the Nobel prize committee says about it:

The discovery that neutrinos can convert from one flavour to another and therefore have nonzero masses is a major milestone for elementary particle physics. It represents compelling experimental evidence for the incompleteness of the Standard Model as a description of nature. Although the possibility of neutrino flavour change, i.e. neutrino oscillations, had been discussed ever since neutrinos were first discovered experimentally in 1956, it was only around the turn of the millennium that two convincing discoveries validated the actual existence of neutrino oscillations: in 1998, at Neutrino ’98, the largest international neutrino conference series, Takaaki Kajita of the Super-Kamiokande Collaboration presented data showing the disappearance of atmospheric muon-neutrinos, i.e. neutrinos produced when cosmic rays interact with the atmosphere, as they travel from their point of origin to the detector. And in 2001/2002, the Sudbury Neutrino Observatory (SNO) Collaboration, led by Arthur B. McDonald, published clear evidence for conversion of electron-type neutrinos from the Sun into muon- or tau-neutrinos. These discoveries are of fundamental importance and constitute a major breakthrough.

I would put it this way: in the old Standard Model, neutrinos were massless.  In the new improved Standard model, they have a nonzero mass. 

In fact, there's a whole 3 × 3 matrix of numbers, the neutrino mass matrix, which says what neutrinos do as they're flying through empty space.   These numbers actually say how the neutrinos interact with the Higgs boson.  This determines their masses, but also how the 3 kinds turn into each other.

We don't know why the numbers in this matrix are what they are.  We may never know.  But maybe someday someone will figure it out.  Physics is full of slow-burning mysteries like this. 

For the full story, go here:

http://www.nobelprize.org/nobel_prizes/physics/laureates/2015/press.html

The neutrino mass matrix is also called the Pontecorvo–Maki–Nakagawa–Sakata matrix.  In 1962, right after the muon neutrino was discovered, Ziro Maki, Masami Nakagawa and Shoichi Sakata speculated that electron and muon neutrinos could turn into each other, and invented a 2 × 2 matrix to describe this.  And even earlier, in 1956, Bruno Pontecorvo had considered the possibility that neutrinos and antineutrinos could turn into each other. 

If you want to actually the numbers in this matrix, go here:

https://en.wikipedia.org/wiki/PMNS_matrix

#physics  
56 comments on original post
3
Add a comment...
In his circles
773 people
Have him in circles
1,483 people
金廷會(Jay Kim)'s profile photo
Park SamJong's profile photo
Song InYoung's profile photo
Game Show TV's profile photo
김동환's profile photo
Chang Kim's profile photo
길호's profile photo
현준양's profile photo
suNngKEun LEe's profile photo

Wongoo Lee

Shared publicly  - 
 
3월달에 얘 데리고 와서 바둑을 뒀어야 되는데
 ·  Translate
8
2
Wongoo Lee's profile photoJungkhun Byun's profile photoYongjik Kim's profile photohyung jin park's profile photo
6 comments
 
이건 ai도 없는 머신이에요, 차나 커피머신 같은거죠.
단 시리나 구글 알파고 같은 애들한테 못되게 굴지 마세요 걔들이 바로 미래 스카이넷이 될지 모를 애들입니다. :^>
 ·  Translate
Add a comment...

Wongoo Lee

Shared publicly  - 
 
빌 게이츠도 선택한 바로 그 책! 너무 커서 들고 다니면서 볼순 없음.

http://www.fastcoexist.com/3054348/heres-what-bill-gates-thinks-you-should-be-reading-this-winter

 ·  Translate
3
1
Jungkhun Byun's profile photoJiho Han's profile photoWongoo Lee's profile photo
3 comments
 
xkcd 그리는 사람이 낸 책들이에요. 앞에껀 what if?
+Jiho Han  진석씨까지 추천했다니 믿을 수 밖에 없군요. 근데 진석씨 링크하려고 하니 restricted라고 나오네요.
 ·  Translate
Add a comment...

Wongoo Lee

Shared publicly  - 
3
1
Wongoo Lee's profile photoJungkhun Byun's profile photo
3 comments
 
저는 뉴저지 패션이죠
 ·  Translate
Add a comment...

Wongoo Lee

Shared publicly  - 
 
아직 invitation only입니다만...
 ·  Translate
1
Add a comment...

Wongoo Lee

Shared publicly  - 
 
올 크리스마스 선물은 이게 좋겠다.
 ·  Translate
The Ninebot mini tops out at 10 mph, climbs 15 degree hills and runs for up to 22 km (14 miles).
1
Add a comment...
Wongoo's Collections
People
In his circles
773 people
Have him in circles
1,483 people
金廷會(Jay Kim)'s profile photo
Park SamJong's profile photo
Song InYoung's profile photo
Game Show TV's profile photo
김동환's profile photo
Chang Kim's profile photo
길호's profile photo
현준양's profile photo
suNngKEun LEe's profile photo
Education
  • 인하대학교
    자동화공학과, 1992 - 1998
  • 인하대학교
    Real-time Computing Systems Laboratory, 1998 - 2000
Basic Information
Gender
Male
Other names
이원구
Apps with Google+ Sign-in
  • Hitman GO
  • Evoland
  • Lara Croft GO
Story
Introduction
software engineer, c++, java, javascript, google, samsung alumni, inha univ, married, twins,
Work
Occupation
Software engineer
Employment
  • Google Inc.
    Software engineer, present
  • Samsung Electronics
Places
Map of the places this user has livedMap of the places this user has livedMap of the places this user has lived
Currently
Sunnyvale
Pool was warm and nice.
Public - a month ago
reviewed a month ago
Its location is very convenient for NYC tourists.
Public - 3 months ago
reviewed 3 months ago
Public - 2 years ago
reviewed 2 years ago
5 reviews
Map
Map
Map
Food: Very GoodDecor: GoodService: Good
Public - 3 years ago
reviewed 3 years ago