How Wireless Energy From Space Could Power Everything | Ali Hajimiri | TED

236,114 views ใƒป 2023-06-06

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์•„๋ž˜ ์˜๋ฌธ์ž๋ง‰์„ ๋”๋ธ”ํด๋ฆญํ•˜์‹œ๋ฉด ์˜์ƒ์ด ์žฌ์ƒ๋ฉ๋‹ˆ๋‹ค.

๋ฒˆ์—ญ: Sora Hwang ๊ฒ€ํ† : Jihyeon J. Kim
00:04
Energy and data are the major currencies of our lives today.
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์—๋„ˆ์ง€์™€ ๋ฐ์ดํ„ฐ๊ฐ€ ํ˜„์žฌ ์šฐ๋ฆฌ ์‚ถ์˜ ์ฃผ์š” ํ†ตํ™”์ž…๋‹ˆ๋‹ค.
00:09
Over the last couple of decades,
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์ง€๋‚œ ์ˆ˜์‹ญ ๋…„๊ฐ„
00:11
we've seen data going from being wired to becoming wireless.
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์šฐ๋ฆฌ๋Š” ๋ฐ์ดํ„ฐ๊ฐ€ ์œ ์„ ์—์„œ ๋ฌด์„ ์œผ๋กœ ์ „ํ™˜๋˜๋Š” ๊ฒƒ์„ ๋ณด์•˜์Šต๋‹ˆ๋‹ค.
00:17
And this has helped democratize access to information.
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์ด๊ฒƒ์€ ์ •๋ณด์— ๋Œ€ํ•œ ์ ‘๊ทผ์„ ๋ฏผ์ฃผํ™”ํ•˜๋Š” ๋ฐ ๋„์›€์ด ๋˜์—ˆ์Šต๋‹ˆ๋‹ค.
00:23
Can we do the same thing with energy?
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์—๋„ˆ์ง€๋„ ์ด์ฒ˜๋Ÿผ ํ•  ์ˆ˜ ์žˆ์„๊นŒ์š”?
00:26
Can we send energy when we want,
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์šฐ๋ฆฌ๊ฐ€ ์›ํ•  ๋•Œ,
00:28
where we want and as much as we want
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์›ํ•˜๋Š” ๊ณณ์œผ๋กœ, ์›ํ•˜๋Š” ๋งŒํผ
00:31
and in the process, eliminate the last wire?
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๋ฌด์„ ์œผ๋กœ ์—๋„ˆ์ง€๋ฅผ ๋ณด๋‚ผ ์ˆ˜ ์žˆ์„๊นŒ์š”?
00:36
If we could do this, the possibilities would be endless.
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์ด๊ฑธ ํ•  ์ˆ˜ ์žˆ๋‹ค๋ฉด ๊ฐ€๋Šฅ์„ฑ์€ ๋ฌดํ•œํ•ฉ๋‹ˆ๋‹ค.
00:39
From Earth to space.
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์ง€๊ตฌ์—์„œ ์šฐ์ฃผ๋กœ์š”.
00:43
I'd like to tell you about our dream of wireless energy transfer today.
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์ €๋Š” ์˜ค๋Š˜ ๋ฌด์„  ์—๋„ˆ์ง€ ์ „์†ก์— ๋Œ€ํ•œ ์ €ํฌ์˜ ๊ฟˆ์„ ์—ฌ๋Ÿฌ๋ถ„๊ป˜ ๋ง์”€๋“œ๋ฆฌ๊ณ ์ž ํ•ฉ๋‹ˆ๋‹ค.
00:48
It starts with something we are all familiar with -- waves.
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์šฐ๋ฆฌ์—๊ฒŒ ์ต์ˆ™ํ•œ ๊ฒƒ์ธ ํŒŒ๋™์œผ๋กœ ์‹œ์ž‘ํ•˜๊ฒ ์Šต๋‹ˆ๋‹ค.
00:52
So waves are very essential to our lives.
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ํŒŒ๋™์€ ์šฐ๋ฆฌ ์ƒํ™œ์— ๋งค์šฐ ์ค‘์š”ํ•œ ์—ญํ• ์„ ํ•ฉ๋‹ˆ๋‹ค.
00:56
You can hear this talk because of acoustic waves.
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์ŒํŒŒ๋กœ ์ธํ•ด ์—ฌ๋Ÿฌ๋ถ„์€ ์ด ์ด์•ผ๊ธฐ๋ฅผ ๋“ค์„ ์ˆ˜ ์žˆ๊ณ ,
01:00
You can see this talk
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๋น›์ด๋ผ๊ณ  ํ•˜๋Š”
01:01
because of a certain kind of electromagnetic waves, called light.
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ํŠน์ • ์ „์ž๊ธฐํŒŒ๋ฅผ ํ†ตํ•ด ์ด ์ด์•ผ๊ธฐ๋ฅผ ๋ณผ ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.
01:06
And the odds are, if you're watching it on the internet,
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์ธํ„ฐ๋„ท์—์„œ ์ด๋ฅผ ์‹œ์ฒญํ•˜๊ณ  ์žˆ๋‹ค๋ฉด
01:08
you're using some sort of wireless connectivity
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๋ฌด์„  ๋ฐ RF ํŒŒ์— ์˜์กดํ•˜๋Š” ์ผ์ข…์˜ ๋ฌด์„  ์—ฐ๊ฒฐ์„
์‚ฌ์šฉํ•˜๊ณ  ์žˆ์„ ํ™•๋ฅ ์ด ๋†’์Šต๋‹ˆ๋‹ค.
01:11
that relies on wireless and RF waves.
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01:15
If you have two waves that have the same frequency
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๋งŒ์•ฝ ๋™์ผํ•œ ์ฃผํŒŒ์ˆ˜๋ฅผ ๊ฐ€์ง€๊ณ 
01:18
and are going up and down
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์ƒํ•˜๋กœ ์›€์ง์ด๋Š”
01:19
and they come together at some point in space,
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๋‘ ๊ฐœ์˜ ํŒŒ๋™์ด ์–ด๋–ค ์ง€์ ์—์„œ ๋งŒ๋‚˜๊ฒŒ ๋œ๋‹ค๋ฉด
01:23
they will add and make a wave that's twice the height
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๊ทธ๋“ค์€ ๊ฒฐํ•ฉํ•˜์—ฌ ๋†’์ด๊ฐ€ ๋‘ ๋ฐฐ์ธ ํŒŒ๋™์„ ๋งŒ๋“ค์–ด ๋‚ด์ง€๋งŒ
01:27
but carries four times the energy.
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์—๋„ˆ์ง€๋Š” ๋„ค ๋ฐฐ๋ฅผ ์šด๋ฐ˜ํ•˜๊ฒŒ ๋ฉ๋‹ˆ๋‹ค.
01:31
Now, if the same two waves come together at some other place in space,
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์ด์ œ ๋™์ผํ•œ ๋‘ ํŒŒ๋™์ด
๋‹ค๋ฅธ ๊ณต๊ฐ„์—์„œ ๋งŒ๋‚˜์ง€๋งŒ
01:35
but one is running half a period late,
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ํ•˜๋‚˜๊ฐ€ ๋ฐ˜์ฃผ๊ธฐ ๋Šฆ๊ฒŒ ์‹คํ–‰๋˜๋ฉด
01:38
they cancel
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๊ทธ๋“ค์€ ์ƒ์‡„๋˜์–ด
01:40
and you get very little energy, practically no energy.
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๊ฑฐ์˜ ์—๋„ˆ์ง€๊ฐ€ ์—†๊ฑฐ๋‚˜
์‚ฌ์‹ค์ƒ ์•„๋ฌด๋Ÿฐ ์—๋„ˆ์ง€๋„ ์–ป์ง€ ๋ชปํ•  ๊ฒƒ์ž…๋‹ˆ๋‹ค.
01:44
This is the basis for a process that has been known for a long time.
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์ด๊ฒƒ์€ ์˜ค๋žซ๋™์•ˆ ์•Œ๋ ค์ง„ ๊ณผ์ •์˜ ๊ธฐ์ดˆ์ž…๋‹ˆ๋‹ค.
01:49
It's called interference.
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๊ฐ„์„ญ์ด๋ผ๊ณ  ํ•˜์ฃ .
01:51
The idea here is that if you go and sit at the edge of a pond
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์ด ๊ฐœ๋…์€ ์—ฐ๋ชป์˜ ๊ฐ€์žฅ์ž๋ฆฌ์— ์•‰์•„
01:54
and take both hands and put them in the water
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์–‘์†์„ ๋ฌผ์— ๋„ฃ๊ณ  ์œ„์•„๋ž˜๋กœ ์›€์ง์ธ๋‹ค๋ฉด
01:56
and move them up and down, each hand makes a wave.
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๊ฐ ์†์ด ํŒŒ๋™์„ ๋งŒ๋“ ๋‹ค๋Š” ๊ฒƒ์ž…๋‹ˆ๋‹ค.
02:00
But because of the interaction of these waves,
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๊ทธ๋Ÿฌ๋‚˜ ์ด๋Ÿฌํ•œ ํŒŒ๋™๋“ค์˜ ์ƒํ˜ธ์ž‘์šฉ์œผ๋กœ ์ธํ•ด
02:02
there will be some directions where you get more energy
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๋” ๋งŽ์€ ์—๋„ˆ์ง€๋ฅผ ์–ป๋Š” ๋ฐฉํ–ฅ๊ณผ
02:05
and there are some directions that you will get less.
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๋” ์ ์€ ์—๋„ˆ์ง€๋ฅผ ์–ป๋Š” ๋ฐฉํ–ฅ์ด ์กด์žฌํ•  ๊ฒƒ์ž…๋‹ˆ๋‹ค.
02:08
Can we make it go only in one direction?
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ํ•œ ๋ฐฉํ–ฅ์œผ๋กœ๋งŒ ํŒŒ๋™์ด ์ „๋‹ฌ๋˜๋„๋ก ํ•  ์ˆ˜ ์žˆ์„๊นŒ์š”?
02:11
Well, you need more hands.
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๊ทธ๋ ‡๋‹ค๋ฉด ์†์ด ๋” ํ•„์š”ํ•ฉ๋‹ˆ๋‹ค.
02:13
And they have to go perfectly synchronized.
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๊ทธ๋ฆฌ๊ณ  ๊ทธ ์†๋“ค์€ ์™„๋ฒฝํ•˜๊ฒŒ ๋™๊ธฐํ™”๋˜์–ด์•ผ ํ•ฉ๋‹ˆ๋‹ค.
02:16
But if you do that,
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๊ทธ๋ ‡๊ฒŒ ํ•œ๋‹ค๋ฉด
02:17
what happens is that most of your energy starts traveling straight down.
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๋Œ€๋ถ€๋ถ„์˜ ์—๋„ˆ์ง€๊ฐ€ ์ง์„ ์œผ๋กœ
์•„๋ž˜์ชฝ์œผ๋กœ ์ด๋™ํ•˜๊ฒŒ ๋ฉ๋‹ˆ๋‹ค.
02:24
Now, this is a remarkable thing
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์ด๊ฒƒ์€ ๋†€๋ผ์šด ์ผ์ž…๋‹ˆ๋‹ค.
02:26
because if you think about each one of those little hands,
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๊ทธ ๊ฐ๊ฐ์˜ ์ž‘์€ ์†, ์ž‘์€ ๊ทผ์›์— ๋Œ€ํ•ด ์ƒ๊ฐํ•œ๋‹ค๋ฉด
๊ทธ๊ฒƒ๋“ค์€ ์‚ฌ๋ฐฉ์œผ๋กœ
02:29
each one of those little sources,
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02:30
they would send energy all over the place.
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์—๋„ˆ์ง€๋ฅผ ๋ณด๋‚ผ ๊ฒƒ์ด๊ธฐ ๋•Œ๋ฌธ์ž…๋‹ˆ๋‹ค.
02:32
But when they work together,
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ํ•˜์ง€๋งŒ ์ด๋“ค์ด ํ•จ๊ป˜ ์ž‘๋™ํ•˜๋ฉด
02:35
the result is that the energy is going mostly in one direction.
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๊ฒฐ๊ณผ์ ์œผ๋กœ ์—๋„ˆ์ง€๋Š” ์ฃผ๋กœ ํ•œ ๋ฐฉํ–ฅ์œผ๋กœ ์ด๋™ํ•ฉ๋‹ˆ๋‹ค.
02:40
Now, if the timing was the reason for this happening,
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์ด๋Ÿฌํ•œ ํ˜„์ƒ์ด ๋ฐœ์ƒํ•˜๋Š” ์ด์œ ๊ฐ€ ํƒ€์ด๋ฐ์ด๋ผ๋ฉด
02:44
maybe we can play with it.
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์šฐ๋ฆฌ๋Š” ๊ทธ๊ฒƒ์„ ๊ฐ€์ง€๊ณ  ๋†€ ์ˆ˜ ์žˆ์„์ง€๋„ ๋ชจ๋ฆ…๋‹ˆ๋‹ค.
02:46
Maybe we can mess with it and see what happens.
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๊ทธ๊ฒƒ์„ ์—‰๋ง์œผ๋กœ ๋งŒ๋“ค๊ณ  ์–ด๋–ค ์ผ์ด ๋ฒŒ์–ด์งˆ์ง€ ๋ณผ ์ˆ˜๋„ ์žˆ์ฃ .
02:49
So what if each one of these sources
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๊ทธ๋ ‡๋‹ค๋ฉด ๊ฐ๊ฐ ์˜†์˜ ๊ฒƒ๋ณด๋‹ค
02:51
goes a little bit after the one next to it?
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์กฐ๊ธˆ์”ฉ ๋Šฆ๊ฒŒ ์›€์ง์ด๋ฉด ์–ด๋–ป๊ฒŒ ๋ ๊นŒ์š”?
02:55
So in that case,
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์ด ๊ฒฝ์šฐ
02:56
what happens is that these waves start going in different directions,
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์ด ํŒŒ๋™๋“ค์€ ๋‹ค๋ฅธ ๋ฐฉํ–ฅ์œผ๋กœ ๊ฐ€๊ธฐ ์‹œ์ž‘ํ•˜๊ณ 
02:59
and you can change that direction
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ํƒ€์ด๋ฐ์„ ์ œ์–ดํ•˜๋Š” ๊ฒƒ๋งŒ์œผ๋กœ
03:02
purely by controlling timing and nothing else.
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๊ทธ ๋ฐฉํ–ฅ์„ ๋ฐ”๊ฟ€ ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.
03:08
Now, this makes it possible to change this direction
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์ด์ œ ๊ธฐ๊ณ„์ ์ธ ์›€์ง์ž„ ์—†์ด๋„
03:11
without any mechanical movement.
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์ด ๋ฐฉํ–ฅ์„ ๋ณ€๊ฒฝํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.
03:12
So it can be almost instantaneous.
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๊ทธ๋ ‡๊ฒŒ ๋˜๋ฉด ๊ฑฐ์˜ ์ฆ‰๊ฐ์ ์œผ๋กœ ํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.
03:15
You can go even further.
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๋” ๋‚˜์•„๊ฐ€
03:17
You can think about creating a magnifying glass.
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๋‹๋ณด๊ธฐ ๋งŒ๋“œ๋Š” ๊ฒƒ์— ๋Œ€ํ•ด ์ƒ๊ฐํ•ด ๋ณผ ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.
03:21
A focusing system,
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ํ•˜๋‚˜์˜ ์ดˆ์ ์—
03:23
where you can actually send the energy,
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์—๋„ˆ์ง€์˜ ๊ฑฐ์˜ 90%๋ฅผ ๋ณด๋‚ผ ์ˆ˜ ์žˆ๋Š”
03:25
most of it, close to 90 percent of it, in one focal point.
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์ดˆ์  ์‹œ์Šคํ…œ์ž…๋‹ˆ๋‹ค.
03:29
But again, since you're controlling the timing,
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ํ•˜์ง€๋งŒ ํƒ€์ด๋ฐ์„ ์ œ์–ดํ•˜๊ณ  ์žˆ๊ธฐ ๋•Œ๋ฌธ์—
03:32
you can create different focal points, and you can send it to them.
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๋‹ค๋ฅธ ์ดˆ์ ์„ ๋งŒ๋“ค์–ด ๋ณด๋‚ผ ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.
03:36
And this is the basis for wireless energy transfer.
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์ด๊ฒƒ์ด ๋ฌด์„  ์—๋„ˆ์ง€ ์ „์†ก์˜ ๊ธฐ๋ณธ์ž…๋‹ˆ๋‹ค.
03:40
It's as if you have an army of ants
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์ด๊ฒƒ์€ ๋งˆ์น˜
03:44
that are working in perfect synchronization.
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์™„๋ฒฝํ•œ ๋™๊ธฐํ™” ์ž‘์—…์„ ์ˆ˜ํ–‰ํ•˜๋Š” ๊ฐœ๋ฏธ ๊ตฐ๋Œ€๊ฐ€ ์žˆ๋Š” ๊ฒƒ๊ณผ ๊ฐ™์Šต๋‹ˆ๋‹ค.
03:48
And each one of them contributes a little bit of energy.
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๊ทธ๋“ค ๊ฐ๊ฐ์€ ์ž‘์€ ์—๋„ˆ์ง€๋ฅผ ์ œ๊ณตํ•˜์ง€๋งŒ
03:52
But as a whole, they send it to the right place.
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์ „์ œ์ ์œผ๋กœ ์˜ฌ๋ฐ”๋ฅธ ์žฅ์†Œ๋กœ ๋ณด๋ƒ…๋‹ˆ๋‹ค.
03:56
Now,
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์ด์ œ
03:57
obviously here, timing is everything, like life and comedy.
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์—ฌ๊ธฐ์„œ๋Š” ๋ถ„๋ช…ํžˆ ํƒ€์ด๋ฐ์ด ์ „๋ถ€์ž…๋‹ˆ๋‹ค.
์‚ถ๊ณผ ์ฝ”๋ฏธ๋””์ฒ˜๋Ÿผ ๋ง์ด์ฃ .
04:03
(Laughter)
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(์›ƒ์Œ)
04:05
So weโ€™ve taken this concept,
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๊ทธ๋ž˜์„œ ์šฐ๋ฆฌ๋Š” ์ด ๊ฐœ๋…์„ ๋ฐ›์•„๋“ค์—ฌ
04:07
and we've built these electronic chips, integrated circuits,
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๊ฐ๊ฐ์ด ์ž‘์€ ์—๋„ˆ์ง€๋ฅผ ์ƒ์„ฑํ•˜๋Š”
04:12
that each one of them generates a little bit of power.
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์ „์ž ์นฉ, ํ†ตํ•ฉ ํšŒ๋กœ๋ฅผ ๊ฐœ๋ฐœํ–ˆ์Šต๋‹ˆ๋‹ค.
04:15
But again, as a group, they are designed to work in perfect synchronization
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๋‹ค์‹œ ๋งํ•ด, ๊ทธ๋“ค์€ ์™„๋ฒฝํ•˜๊ฒŒ ๋™๊ธฐํ™”๋˜์–ด ์ž‘๋™ํ•˜๊ณ 
04:20
and drive these little antennas that transmit the energy.
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์ด ์ž‘์€ ์•ˆํ…Œ๋‚˜๋ฅผ ๊ตฌ๋™ํ•˜์—ฌ ์—๋„ˆ์ง€๋ฅผ ์ „์†กํ•˜๋„๋ก ์„ค๊ณ„๋˜์—ˆ์Šต๋‹ˆ๋‹ค.
04:24
Now this army of ants, or army of antennas,
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์ด์ œ ์ด ๊ฐœ๋ฏธ ๊ตฐ๋Œ€ ๋˜๋Š” ์•ˆํ…Œ๋‚˜ ๊ตฐ๋Œ€๋Š”
04:28
is working together to create those focal points of energy.
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ํ•จ๊ป˜ ์ž‘๋™ํ•˜์—ฌ ๊ทธ ์—๋„ˆ์ง€์˜ ์ดˆ์ ์„ ๋งŒ๋“ค์–ด ๋‚ด๊ณ  ์žˆ์Šต๋‹ˆ๋‹ค.
04:32
And what I will show you next
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๋‹ค์Œ์œผ๋กœ ์‹ค์ œ๋กœ ๊ทธ๊ฒƒ์ด ์–ด๋–ป๊ฒŒ
04:33
is some examples of how that actually operates.
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์ž‘๋™ํ•˜๋Š”์ง€์— ๋Œ€ํ•œ ๋ช‡ ๊ฐ€์ง€ ์˜ˆ์‹œ๋ฅผ ๋ณด์—ฌ ๋“œ๋ฆฌ๊ฒ ์Šต๋‹ˆ๋‹ค.
04:36
So what you have here, for example,
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์˜ˆ๋ฅผ ๋“ค์–ด, ์—ฌ๊ธฐ์— ์žˆ๋Š” ๊ฒƒ์€ ๋ฐœ์ „๊ธฐ ์žฅ์น˜๋กœ
04:38
is a generator unit that's sending power wirelessly to the two receivers.
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๋‘ ๊ฐœ์˜ ์ˆ˜์‹ ๊ธฐ์— ๋ฌด์„ ์œผ๋กœ ์ „๋ ฅ์„ ์ „์†กํ•˜๊ณ  ์žˆ์Šต๋‹ˆ๋‹ค.
04:44
And here the point is to see how well-defined these focal points are.
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์—ฌ๊ธฐ์—์„œ ์ค‘์š”ํ•œ ์ ์€
์ด๋Ÿฌํ•œ ์ดˆ์ ์ด ์–ผ๋งˆ๋‚˜ ๋ช…ํ™•ํ•œ์ง€๋ฅผ ๋ณด๋Š” ๊ฒƒ์ž…๋‹ˆ๋‹ค.
04:49
That LED panel basically is receiving that power and showing it.
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ํ•ด๋‹น LED ํŒจ๋„์€ ๊ธฐ๋ณธ์ ์œผ๋กœ ๊ทธ ์ „๋ ฅ์„ ์ˆ˜์‹ ํ•˜๊ณ  ํ‘œ์‹œํ•ฉ๋‹ˆ๋‹ค.
04:53
So you can see energy is going only where it needs to go and nowhere else.
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๋”ฐ๋ผ์„œ ์—๋„ˆ์ง€๊ฐ€ ํ•„์š”ํ•œ ๊ณณ์œผ๋กœ๋งŒ ์ „๋‹ฌ๋˜๊ณ  ์žˆ์Œ์„ ํ™•์ธํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.
04:57
You can take this and put one of these generators
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์ด๊ฒƒ์„ ์ ์šฉํ•˜๋ฉด ์ด๋Ÿฌํ•œ ๋ฐœ์ „๊ธฐ ์ค‘ ํ•˜๋‚˜๋ฅผ
05:00
on the ceiling of your conference room or your living room
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ํšŒ์˜์‹ค์ด๋‚˜ ๊ฑฐ์‹ค ์ฒœ์žฅ์— ์„ค์น˜ํ•˜๊ณ 
05:03
and transmit energy to various devices that need energy.
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์—๋„ˆ์ง€๊ฐ€ ํ•„์š”ํ•œ ๋‹ค์–‘ํ•œ ์žฅ์น˜์— ์—๋„ˆ์ง€๋ฅผ ์ „์†กํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.
05:07
Now this generator on the ceiling is going to power a light bulb.
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์ด์ œ ์ฒœ์žฅ์— ์žˆ๋Š” ์ด ๋ฐœ์ „๊ธฐ๊ฐ€ ์ „๊ตฌ์— ์ „๋ ฅ์„ ๊ณต๊ธ‰ํ•  ๊ฒƒ์ž…๋‹ˆ๋‹ค.
05:13
Now, as we move the light bulb,
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์ด์ œ ์ „๊ตฌ๋ฅผ ์›€์ง์ด๋ฉด
05:16
what happens is that you see
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์ƒˆ๋กœ์šด ์œ„์น˜์—๋Š”
05:18
that there's no energy in the new location,
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์—๋„ˆ์ง€๊ฐ€ ์—†์Œ์„ ์•Œ ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.
05:20
but the system finds it, tracks it
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๊ทธ๋Ÿฌ๋‚˜ ์‹œ์Šคํ…œ์ด ๊ทธ๊ฒƒ์„ ์ฐพ๊ณ  ์ถ”์ ํ•˜์—ฌ
05:22
and sends it to the new location.
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์ƒˆ๋กœ์šด ์œ„์น˜๋กœ ์—๋„ˆ์ง€๋ฅผ ์ „์†กํ•ฉ๋‹ˆ๋‹ค.
05:25
And you can see that it dynamically tracks it back and forth.
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์ด์ œ ์‹œ์Šคํ…œ์ด ๋™์ ์œผ๋กœ ์ถ”์ ํ•œ๋‹ค๋Š” ๊ฒƒ์„ ์•Œ ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.
05:30
You can use this to send energy to one light bulb
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์ด๋ฅผ ์ด์šฉํ•˜์—ฌ ํ•˜๋‚˜์˜ ์ „๊ตฌ๋กœ
05:34
or to the next one or to both of them at the same time.
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๋˜๋Š” ์ด์–ด ๋‹ค๋ฅธ ์ „๊ตฌ๋กœ
๋˜๋Š” ๋‘ ์ „๊ตฌ ๋™์‹œ์— ์—๋„ˆ์ง€๋ฅผ ๋ณด๋‚ผ ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.
05:40
Now you can use something like this, for example, to power a drone.
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์ด์ œ ์ด์™€ ๊ฐ™์€ ๊ฒƒ์„ ์‚ฌ์šฉํ•˜์—ฌ
๋“œ๋ก ์—๋„ ์ „๋ ฅ์„ ๊ณต๊ธ‰ํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.
05:45
This is a battery-less drone
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์ด๊ฒƒ์€ ๋ฐฐํ„ฐ๋ฆฌ ์—†๋Š” ๋“œ๋ก ์ธ๋ฐ
05:48
that's being purely powered by that generator
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์ˆœ์ „ํžˆ ์ € ๋ฐœ์ „๊ธฐ๋กœ๋งŒ ์ „๋ ฅ์ด ๊ณต๊ธ‰๋ฉ๋‹ˆ๋‹ค.
05:51
facing up from the bottom.
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๋ฐ”๋‹ฅ์—์„œ ์œ„๋ฅผ ํ–ฅํ•˜๊ณ  ์žˆ์ฃ .
05:52
And it can also use the same tracking approach to track the drone.
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๋™์ผํ•œ ์ถ”์  ๋ฐฉ์‹์„ ์‚ฌ์šฉํ•˜์—ฌ ๋“œ๋ก ์„ ์ถ”์ ํ•  ์ˆ˜๋„ ์žˆ์Šต๋‹ˆ๋‹ค.
05:57
So now that we know that we can send energy wirelessly,
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์ด์ œ ๋ฌด์„ ์œผ๋กœ ์—๋„ˆ์ง€๋ฅผ ๋ณด๋‚ผ ์ˆ˜ ์žˆ๋‹ค๋Š” ์‚ฌ์‹ค์€ ์•Œ์•˜๋Š”๋ฐ
06:02
the question is, how far can we go?
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๋ฌธ์ œ๋Š” ์–ด๋””๊นŒ์ง€ ๊ฐˆ ์ˆ˜ ์žˆ๋‚˜์ž…๋‹ˆ๋‹ค.
06:05
Really, how far can we go?
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์ •๋ง ์–ด๋””๊นŒ์ง€ ๊ฐˆ ์ˆ˜ ์žˆ์„๊นŒ์š”?
06:09
Could we put photovoltaics in space,
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์šฐ์ฃผ์— ๊ด‘์ „์ง€๋ฅผ ์„ค์น˜ํ•˜๊ณ 
06:13
solar panels in space,
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ํƒœ์–‘ ์ „์ง€ํŒ์„ ์„ค์น˜ํ•ด์„œ
06:15
and collect the energy and send that wirelessly to Earth?
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์—๋„ˆ์ง€๋ฅผ ๋ชจ์•„ ๋ฌด์„ ์œผ๋กœ ์ง€๊ตฌ๋กœ ๋ณด๋‚ผ ์ˆ˜ ์žˆ์„๊นŒ์š”?
06:20
This is not a new idea.
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์ด๋Š” ์ƒˆ๋กœ์šด ์•„์ด๋””์–ด๊ฐ€ ์•„๋‹™๋‹ˆ๋‹ค.
06:24
The first time it was mentioned,
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์ฒ˜์Œ์œผ๋กœ ์–ธ๊ธ‰๋œ ๋•Œ๋Š”
06:25
it was in a short science-fiction story by Isaac Asimov from 1941.
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1941๋…„์— ์ด์‚ญ ์•„์‹œ๋ชจํ”„๊ฐ€ ์“ด
๋‹จํŽธ ๊ณต์ƒ ๊ณผํ•™ ์†Œ์„ค์—์„œ์˜€์Šต๋‹ˆ๋‹ค.
06:33
And what I love about this story is that
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์ด ์ด์•ผ๊ธฐ์—์„œ ์ข‹์•„ํ•˜๋Š” ์ ์€
06:36
it's about a self-conscious robot.
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์ž์˜์‹์„ ๊ฐ€์ง„ ๋กœ๋ด‡์— ๊ด€ํ•œ ๊ฒƒ์ด๋ผ๋Š” ์ ์ž…๋‹ˆ๋‹ค.
06:44
And the humans describing this idea to the self-conscious robot,
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๊ทธ๋ฆฌ๊ณ  ์ธ๊ฐ„๋“ค์ด ์ด ์•„์ด๋””์–ด๋ฅผ ์ž์˜์‹์„ ๊ฐ€์ง„ ๋กœ๋ด‡์—๊ฒŒ ์„ค๋ช…ํ•˜์ž
06:48
after which the robot says,
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๋กœ๋ด‡์€
06:51
"Do you expect me to believe such a far-fetched, crazy notion?
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โ€œ๋‚ด๊ฐ€ ๊ทธ๋ ‡๊ฒŒ ํ„ฐ๋ฌด๋‹ˆ์—†๊ณ  ๋ง๋„ ์•ˆ ๋˜๋Š” ์ƒ๊ฐ์„ ๋ฏฟ์„ ๊ฒƒ์ด๋ผ๊ณ  ๊ธฐ๋Œ€ํ•ฉ๋‹ˆ๊นŒ?
06:55
What do you take me for?"
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๋‚˜๋ฅผ ๋ฌด์—‡์œผ๋กœ ์ƒ๊ฐํ•ฉ๋‹ˆ๊นŒ?โ€ ๋ผ๊ณ  ๋งํ•ฉ๋‹ˆ๋‹ค.
06:57
The first question almost always asked is that,
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์ฒซ ๋ฒˆ์งธ๋กœ ๊ฑฐ์˜ ํ•ญ์ƒ ๋ฌป๋Š” ์งˆ๋ฌธ์€
07:01
โ€œWhy do you want to put your solar panels in space?
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โ€œ์™œ ํƒœ์–‘ ์ „์ง€ํŒ์„ ์šฐ์ฃผ์— ๋‘๋ ค๊ณ  ํ•˜๋Š” ๊ฑฐ์ง€?
07:04
Why donโ€™t you put them up in the desert and be done with it?โ€ Right?
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์™œ ์‚ฌ๋ง‰์— ์„ค์น˜ํ•ด์„œ ๋๋‚ด์ง€ ์•Š๋Š” ๊ฑฐ์•ผ?โ€ ๊ทธ๋ ‡์ฃ ?
07:10
A few reasons.
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๋ช‡ ๊ฐ€์ง€ ์ด์œ ๊ฐ€ ์žˆ์Šต๋‹ˆ๋‹ค.
07:12
First is that in space you get about eight times more energy
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์ฒซ์งธ๋กœ, ์šฐ์ฃผ์—์„œ๋Š” ์•ฝ 8๋ฐฐ ์ •๋„ ๋” ๋งŽ์€ ์—๋„ˆ์ง€๋ฅผ ์–ป์„ ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.
07:16
because you don't have day and night,
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์™œ๋ƒํ•˜๋ฉด ์šฐ์ฃผ๋Š” ๋‚ฎ๊ณผ ๋ฐค์ด ์—†๊ณ 
07:19
you don't have clouds, you don't have seasons,
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๊ตฌ๋ฆ„๋„ ๊ณ„์ ˆ๋„ ์—†์œผ๋ฉฐ
07:22
and you don't have the atmospheric absorption.
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๋Œ€๊ธฐ ํก์ˆ˜๋„ ์—†๊ธฐ ๋•Œ๋ฌธ์ž…๋‹ˆ๋‹ค.
07:26
Also, now that you have this ability to send energy where you want
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๋˜ํ•œ ์›ํ•˜๋Š” ๊ณณ์— ์›ํ•˜๋Š” ์‹œ๊ฐ„์—
07:31
and when you want dynamically,
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๋™์ ์œผ๋กœ ์—๋„ˆ์ง€๋ฅผ ์ „์†กํ•  ์ˆ˜ ์žˆ๊ธฐ ๋•Œ๋ฌธ์—
07:33
you can imagine that you have dispatchable power.
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์‹ ์†ํ•˜๊ฒŒ ์ „๋ ฅ์„ ๊ณต๊ธ‰ ๋ฐ›์„ ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.
07:38
On top of that,
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๋ฌด์—‡๋ณด๋‹ค๋„
07:39
it's an always-available power.
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์–ธ์ œ๋“  ์‚ฌ์šฉ ๊ฐ€๋Šฅํ•˜๋‹ค๋Š” ๊ฒƒ์ž…๋‹ˆ๋‹ค.
07:41
This can be used for a place, for example,
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์˜ˆ๋ฅผ ๋“ค์–ด, ํ—ˆ๋ฆฌ์ผ€์ธ์œผ๋กœ ์ธํ•ด
07:44
let's say an island hit by a hurricane
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์ „๊ธฐ๊ฐ€ ๊ณต๊ธ‰๋˜์ง€ ์•Š๋Š” ์„ฌ๊ณผ ๊ฐ™์€
07:47
where thereโ€™s no power.
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์žฅ์†Œ์— ์‚ฌ์šฉ๋  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.
07:49
Or a city in war zone
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๋˜๋Š” ์ „๋ ฅ ์ธํ”„๋ผ๊ฐ€
07:51
where the power infrastructure is being constantly attacked.
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์ง€์†์ ์œผ๋กœ ๊ณต๊ฒฉ ๋ฐ›๋Š” ์ „์Ÿ ์ง€์—ญ๊ณผ ๊ฐ™์€ ๊ณณ์— ์‚ฌ์šฉ๋  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.
07:55
You can think about using this to send power
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์†ก์ „ ์ธํ”„๋ผ๊ฐ€ ์—†๋Š”
07:58
to a remote village in sub-Saharan Africa
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์•„ํ”„๋ฆฌ์นด ์‚ฌํ•˜๋ผ ์ง€์—ญ์˜ ์™ธ๋”ด ๋งˆ์„์—
08:00
where there is no infrastructure for power transmission.
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์ „๋ ฅ์„ ๊ณต๊ธ‰ํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.
08:04
And that way democratize the access to energy.
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์ด๋Ÿฐ ์‹์œผ๋กœ ์—๋„ˆ์ง€ ์ ‘๊ทผ์„ ๋ฏผ์ฃผํ™”ํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.
08:08
Or send it somewhere above the Arctic circle.
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๋˜๋Š” ๋ถ๊ทน๊ถŒ ์œ„ ์–ด๋”˜๊ฐ€๋กœ ์—๋„ˆ์ง€๋ฅผ ์ „์†กํ•  ์ˆ˜๋„ ์žˆ์Šต๋‹ˆ๋‹ค.
08:11
So all of these things are great.
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์ด ๋ชจ๋“  ๊ฒƒ๋“ค์€ ํ›Œ๋ฅญํ•œ ์•„์ด๋””์–ด์ž…๋‹ˆ๋‹ค.
08:13
But the question is,
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๊ทธ๋Ÿฐ๋ฐ ๋ฌธ์ œ๋Š”
08:14
if it has been known for such a long time and it's such a great thing,
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์ด๋ ‡๊ฒŒ ์˜ค๋ž˜์ „๋ถ€ํ„ฐ ์•Œ๋ ค์ง€๊ณ  ๊ทธ๋ ‡๊ฒŒ ๋Œ€๋‹จํ•œ ์ผ์ด๋ผ๋ฉด
08:17
why hasn't it been done so far?
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์™œ ์ง€๊ธˆ๊นŒ์ง€ ํ•˜์ง€ ์•Š์•˜์„๊นŒ ํ•˜๋Š” ๊ฒƒ์ž…๋‹ˆ๋‹ค.
08:19
The main reason is that the way it has been envisioned before,
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์ฃผ๋œ ์ด์œ ๋Š” ์ด์ „์— ๊ทธ๊ฒƒ์ด
08:22
they've been thinking about it as a big elephant.
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ํฐ ์ฝ”๋ผ๋ฆฌ๋กœ ์ƒ์ƒ๋˜์–ด ์™”๊ธฐ ๋•Œ๋ฌธ์ž…๋‹ˆ๋‹ค.
08:26
If you're thinking about putting big solar panels in space,
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์šฐ์ฃผ์— ํฐ ํƒœ์–‘ ์ „์ง€ํŒ์„ ์„ค์น˜ํ•˜๊ณ 
08:29
collecting the power, generating a lot of energy,
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์ „๋ ฅ์„ ์ˆ˜์ง‘ํ•˜๊ณ  ๋งŽ์€ ์—๋„ˆ์ง€๋ฅผ ์ƒ์„ฑํ•œ ๋‹ค์Œ
08:32
and then putting it into a massive parabolic dish antenna
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๊ฑฐ๋Œ€ํ•œ ํฌ๋ฌผ์„  ์•ˆํ…Œ๋‚˜์— ์ „๋ ฅ์„ ๊ณต๊ธ‰ํ•˜์—ฌ
์ง€๊ตฌ์˜ ๊ณ ์ •๋œ ์œ„์น˜๋กœ ์ „์†กํ•˜๋Š” ๋ฐฉ์‹์œผ๋กœ ์ƒ๊ฐํ•ด์™”๊ธฐ ๋•Œ๋ฌธ์ž…๋‹ˆ๋‹ค.
08:36
and sending it to a fixed location on Earth.
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08:39
Sending things to space is expensive.
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์šฐ์ฃผ๋กœ ๋ณด๋‚ด๋Š” ๊ฒƒ์€ ๋น„์šฉ์ด ๋งŽ์ด ๋“ญ๋‹ˆ๋‹ค.
08:41
You pay dollars -- and that's plural -- per gram.
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๊ทธ๋žจ ๋‹น ๋ช‡ ๋‹ฌ๋Ÿฌ๋ฅผ ์ง€๋ถˆํ•ด์•ผ ํ•ฉ๋‹ˆ๋‹ค.
08:45
The other problem is that even if you could afford it,
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๋˜ ๋‹ค๋ฅธ ๋ฌธ์ œ๋Š” ๋น„์šฉ์„ ๊ฐ๋‹นํ•  ์ˆ˜ ์žˆ๋‹ค๊ณ  ํ•ด๋„
08:48
assembly of something like this in space
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์ด๋Ÿฌํ•œ ๊ฒƒ์„ ์šฐ์ฃผ์—์„œ ์กฐ๋ฆฝํ•˜๋Š” ๊ฒƒ์€
08:50
is still beyond the capabilities that we have today.
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์˜ค๋Š˜๋‚  ์—ฌ์ „ํžˆ ์šฐ๋ฆฌ์˜ ๋Šฅ๋ ฅ ๋ฐ–์ž…๋‹ˆ๋‹ค.
08:54
So we came up with a very different approach
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๊ทธ๋ž˜์„œ ๋ฐœ์ „๊ธฐ๋ฅผ ์œ ์—ฐํ•˜๊ณ 
08:56
where we took our generators
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์ฒœ๊ณผ ๊ฐ™์€ ๊ตฌ์กฐ๋ฌผ๋กœ ๋งŒ๋“œ๋Š”
08:59
and turned them into flexible, fabric-like structures.
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๋‹ค๋ฅธ ์ ‘๊ทผ ๋ฐฉ์‹์„ ์ƒ๊ฐํ•ด ๋ƒˆ์Šต๋‹ˆ๋‹ค.
09:03
We are utilizing the amazing power of electronics,
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์šฐ๋ฆฌ๋Š” ํ†ตํ•ฉ ์ „์ž, ์œ ์—ฐํ•œ ์ „์ž์˜
09:06
integrated electronics and flexible electronics,
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๋†€๋ผ์šด ํž˜์„ ํ™œ์šฉํ•˜์—ฌ
09:08
to make this very lightweight, flexible, fabric-like structures
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๋ง์•„์„œ ํฌ์žฅํ•  ์ˆ˜ ์žˆ๋Š” ๋งค์šฐ ๊ฐ€๋ณ๊ณ  ์œ ์—ฐํ•œ
09:12
that you can roll and pack.
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์ง๋ฌผ๊ณผ ๊ฐ™์€ ๊ตฌ์กฐ๋ฅผ ๋งŒ๋“ค๊ณ  ์žˆ์Šต๋‹ˆ๋‹ค.
09:15
And this allows you to have these satellites packed for launch
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์ด๋กœ์จ ์ด๋Ÿฌํ•œ ์œ„์„ฑ๋“ค์„ ์šฐ์ฃผ์— ๋ฐœ์‚ฌํ•˜๊ณ  ๋ฐฐ์น˜ํ•˜๋„๋ก
09:20
and deployed in space,
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ํฌ์žฅ์ด ๊ฐ€๋Šฅํ•˜๊ฒŒ ๋˜์—ˆ๋Š”๋ฐ
09:22
where each one of these units
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๊ฐ ์œ ๋‹›์€
09:24
would be about several tens of meters on the side.
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ํ•œ ๋ฉด์˜ ๊ธธ์ด๊ฐ€ ๋ช‡์‹ญ ๋ฏธํ„ฐ ์ •๋„ ๋  ๊ฒƒ์ž…๋‹ˆ๋‹ค.
09:26
And then you can pack a whole bunch of them
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๊ทธ๋Ÿฐ ๋‹ค์Œ ๊ทธ๊ฒƒ๋“ค์„ ํ•œ ๊พธ๋Ÿฌ๋ฏธ๋กœ ํฌ์žฅํ•˜๊ณ 
09:29
and create a constellation of them
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์šฐ์ฃผ์—์„œ ๋‚ ์•„๋‹ค๋‹ ๋ฐฐ์น˜๋ฅผ ์ •ํ•˜๊ณ 
09:31
that flies in space
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์ง€๊ตฌ๋กœ ๊ทธ๋ฆฐ ์—๋„ˆ์ง€๋ฅผ ๋ณด๋‚ผ
09:32
and forms your power station to send green energy to Earth.
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๋ฐœ์ „์†Œ๋ฅผ ํ˜•์„ฑํ•ฉ๋‹ˆ๋‹ค.
09:36
This will be flying in formation around the Earth.
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์ด๊ฒƒ์€ ์ง€๊ตฌ ์ฃผ๋ณ€์—์„œ ํ˜•์„ฑ๋œ ํ˜•ํƒœ๋กœ ๋‚ ์•„๋‹ค๋‹ ๊ฒƒ์ž…๋‹ˆ๋‹ค.
09:39
Obviously, this is not the size of the planet
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๋‹น์—ฐํžˆ ์ด๋Š” ํ–‰์„ฑ๋งŒํผ ํฌ์ง„ ์•Š์Šต๋‹ˆ๋‹ค.
09:42
because we're talking about a kilometer across for the whole whole constellation
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์ „์ฒด ์œ„์„ฑ ๊พธ๋Ÿฌ๋ฏธ์˜ ์ง€๋ฆ„์ด 1km ์ •๋„์ธ๋ฐ
09:45
and the planet is a little bit larger than a kilometer.
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ํ–‰์„ฑ์€ 1km๋ณด๋‹ค ์กฐ๊ธˆ ๋” ํฌ๋‹ˆ๊นŒ์š”.
09:48
We've been developing, as a proof of concept,
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์šฐ๋ฆฌ๋Š” ์ด ๊ฐœ๋…์„ ์ฆ๋ช…ํ•˜๊ณ 
09:51
technology demonstrator,
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๊ธฐ์ˆ  ์‹œ์—ฐ์„ ์œ„ํ•ด
09:52
and this is called Maple,
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โ€˜Mapleโ€™์ด๋ผ๋Š” ๊ฒƒ์„ ๊ฐœ๋ฐœํ–ˆ๋Š”๋ฐ
09:54
which demonstrates the power of flexible structures
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์ด๋Š” ์œ ์—ฐํ•œ ๊ตฌ์กฐ์™€ ์ „์ž ํšŒ๋กœ ๊ธฐ์ˆ ์ด
09:57
and electronic circuitry
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์šฐ์ฃผ์—์„œ ์ „๋ ฅ์„ ์ƒ์„ฑํ•˜๊ณ 
09:59
to generate and transmit power in space.
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์ „์†กํ•˜๋Š” ๋Šฅ๋ ฅ์„ ๋ณด์—ฌ์ค๋‹ˆ๋‹ค.
10:02
We integrated that with two other technology demonstrators
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์šฐ๋ฆฌ๋Š” ์ด๋ฅผ ์ €์™€ ์ œ ๋™๋ฃŒ ๋‘ ๋ช…์ด ์ด๋„๋Š”
10:06
for deployable structures and photovoltaics
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์„ธ ํŒ€์ด ๊ฐœ๋ฐœํ•œ ๋ฐฐ์น˜ ๊ฐ€๋Šฅํ•œ ๊ตฌ์กฐ์™€
10:09
that were developed by three teams,
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ํƒœ์–‘ ์ „์ง€ํŒ์„ ํฌํ•จํ•œ
10:11
led by myself and two of my colleagues.
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๋‘ ๊ฐ€์ง€ ๋‹ค๋ฅธ ๊ธฐ์ˆ  ์‹œ์—ฐ์ฒด๋ฅผ ํ†ตํ•ฉํ–ˆ์Šต๋‹ˆ๋‹ค.
10:13
And we integrated into a satellite that was launched recently.
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๊ทธ๋ฆฌ๊ณ  ์ตœ๊ทผ์— ๋ฐœ์‚ฌ๋œ ์œ„์„ฑ์— ์ด๋ฅผ ํ†ตํ•ฉํ–ˆ์Šต๋‹ˆ๋‹ค.
10:19
And the purpose of this experiment
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์ด ์‹คํ—˜์˜ ๋ชฉ์ ์€
10:21
has been to demonstrate the power transfer,
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์šฐ์ฃผ์—์„œ ๋ฌด์„  ์ „๋ ฅ ์ „์†ก์„
10:24
wireless power transfer in space.
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์ฆ๋ช…ํ•˜๋Š” ๊ฒƒ์ด์—ˆ์Šต๋‹ˆ๋‹ค.
10:28
Now that brings me back to the promise of wireless energy transfer
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์ด์ œ ๋ฌด์„  ์—๋„ˆ์ง€ ์ „์†ก์˜ ์•ฝ์†๊ณผ ๊ทธ๊ฒƒ์ด ์šฐ๋ฆฌ์—๊ฒŒ ๋ฌด์—‡์„ ์˜๋ฏธํ•  ์ˆ˜ ์žˆ๋Š”์ง€
10:34
and what it could mean for us.
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๋‹ค์‹œ ์ƒ๊ฐํ•˜๊ฒŒ ๋˜์—ˆ์Šต๋‹ˆ๋‹ค.
10:36
I believe this technology is too compelling to go away.
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์ €๋Š” ์ด ๊ธฐ์ˆ ์ด ์‚ฌ๋ผ์ง€๊ธฐ์—๋Š” ๋„ˆ๋ฌด ๋งค๋ ฅ์ ์ด๋ผ๊ณ  ์ƒ๊ฐํ•ฉ๋‹ˆ๋‹ค.
10:41
And I believe it's bound to appear in our lives in one form or another.
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๊ทธ๋ฆฌ๊ณ  ์–ด๋–ค ํ˜•ํƒœ๋กœ๋“  ์šฐ๋ฆฌ ์ƒํ™œ์— ๋‚˜ํƒ€๋‚  ์ˆ˜๋ฐ–์— ์—†์„ ๊ฒƒ์ด๋ผ ๋ฏฟ์Šต๋‹ˆ๋‹ค.
10:45
And that is something to look forward to.
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๊ทธ๊ฒƒ์€ ๊ธฐ๋Œ€ํ•  ๋งŒํ•œ ๊ฒƒ์ž…๋‹ˆ๋‹ค.
10:48
Thank you.
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๊ฐ์‚ฌํ•ฉ๋‹ˆ๋‹ค.
10:49
(Applause)
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(๋ฐ•์ˆ˜)
์ด ์›น์‚ฌ์ดํŠธ ์ •๋ณด

์ด ์‚ฌ์ดํŠธ๋Š” ์˜์–ด ํ•™์Šต์— ์œ ์šฉํ•œ YouTube ๋™์˜์ƒ์„ ์†Œ๊ฐœํ•ฉ๋‹ˆ๋‹ค. ์ „ ์„ธ๊ณ„ ์ตœ๊ณ ์˜ ์„ ์ƒ๋‹˜๋“ค์ด ๊ฐ€๋ฅด์น˜๋Š” ์˜์–ด ์ˆ˜์—…์„ ๋ณด๊ฒŒ ๋  ๊ฒƒ์ž…๋‹ˆ๋‹ค. ๊ฐ ๋™์˜์ƒ ํŽ˜์ด์ง€์— ํ‘œ์‹œ๋˜๋Š” ์˜์–ด ์ž๋ง‰์„ ๋”๋ธ” ํด๋ฆญํ•˜๋ฉด ๊ทธ๊ณณ์—์„œ ๋™์˜์ƒ์ด ์žฌ์ƒ๋ฉ๋‹ˆ๋‹ค. ๋น„๋””์˜ค ์žฌ์ƒ์— ๋งž์ถฐ ์ž๋ง‰์ด ์Šคํฌ๋กค๋ฉ๋‹ˆ๋‹ค. ์˜๊ฒฌ์ด๋‚˜ ์š”์ฒญ์ด ์žˆ๋Š” ๊ฒฝ์šฐ ์ด ๋ฌธ์˜ ์–‘์‹์„ ์‚ฌ์šฉํ•˜์—ฌ ๋ฌธ์˜ํ•˜์‹ญ์‹œ์˜ค.

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