trilliwon

Precision and ambiguity

• Coarse-grained materials or systems have fewer, larger discrete components than fine-grained materials or systems.
• A coarse-grained description of a system regards large subcomponents.
• A fine-grained description regards smaller components of which the larger ones are composed.

granularity : 과립 상태

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True Positive

참인 것을 참으로 판단

True Negative

거짓인 것을 거짓으로 판단

False Positive

실제 거짓인 것을 참인 것으로 판정하는 오류

A false positive error, or in short a false positive, commonly called a "false alarm", is a result that indicates a given condition exists, when it does not. For example, in the case of "The Boy Who Cried Wolf", the condition tested for was "is there a wolf near the herd?"; the shepherd at first wrongly indicated there was one, by calling "Wolf, wolf!"

trilliwon

Python Study

• tutorials
• Built in functions
• The Python Standard Library

여러개의 입력값을 받을 때

trilliwon

I love vim

Vim Visual Mode

• v% if the cursor is on the starting/ending parenthesis
• vib if the cursor is inside the parenthesis block
• vi" for double quotes
• vi' for single quotes
• vi{ / viB for curly block

trilliwon

CNAME vs A Records

Last Edited: May 14, 2019 11:06 AM

A and CNAME records are for DNS records.

Deferences

• The A record maps a name to one or more IP addresses when the IP are known and stable.
• The CNAME record maps a name to another name. It should only be used when there are no other records on that name.

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How the internet works

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Bandwidth

• transmission capacity, measured by bitrate

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Tree-and-Graph

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Tree

What is Tree?

• 그래프의 일종이다.

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bandwidth, throughput, latency

• bandwidth (대역폭)

  • 단위 시간 동안 한 곳에서 다른 곳으로 전달할 수 있는 데이터의 최대량

• throughput (처리량)

  • 일정한 주기 동안 채널을 가로질러 전송될 수 있는 데이터의 양

• latency (대기시간)

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Private(Local) IP vs Public IP (내부 IP, 외부 IP, IP : Internet Protocol)

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1. Find my IP Address on macOS

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• Option +"Click Wifi Menu Bar", then you can see below

trilliwon

정규표현식으로 한글을 확인하는 방법

const re = /[가-힣]+/g
const sample =
  "Pomodoro, 안녕하세요. Hello World! 아닌데요. Really 저 아니에요."
const result = re.exec(sample)
const result01 = sample.match(re)

console.log(result)