Transition from Exploration to Exploitation

I realize that I spend the majority of time on consuming what others produce. Reading, watching, and listening to materials created by others.

It makes sense to do so when I was young and in the exploration stage of my life. I needed a lot of advice and information from others when I was uncertain about what to do for my career, who to live for the rest of my life together, where to settle and live, and so on.

Exploitation vs. Exploration (credit:

However, now I entered into the exploitation stage – I’ve developed my expertise in my career, data science. I married love of my life and had our children together. My family moved to a place where we’d like to live for generation.Β I need to start to focus on producing.

It’s not to say that I’ve already figured out everything and I don’t need to learn anymore. It’s opposite. It’s time to learn new things about how to produce best by utilizing what I’ve learned in the past.

Studies on the secretary problem state that the optimal stopping point of exploration is 37%. e.g. If you’re recruiting a secretary next 100 days, it’s optimal to pass all candidates during the first 37 days to learn about the total distribution of candidates, and then to hire the first person who is better than all candidates who you interview in the first 37 days.

I spent little over 37% of my life so far, by assuming 100 years of life expectancy by 2080. From now on, I will focus on exploitation, execution, and production.

Q2 2017 Review

Image from

Q2 2017 passed by quickly with a couple of major events at work and family, which I will share when things get settled down.

In spite of a challenging schedule,Β a new goal tracking app, Strides, helped me track the progress of goals easily and keep on track of completing those. Even I added a few new goals for the rest of the year.

Yearly Goals

  • Running 200 miles (50%) – I ran 42 miles in Q2, and 100 miles so far.
  • Reading 24 books (63%) – I read 6 books in Q2, and 15 books so far.
    • Ghost in the WiresΒ – About the legendary hacker, Kevin Mitnick. Very entertaining.Β πŸ‘
    • How Google Works – Insider stories of Google by Eric Schmidt and Jonathan Rosenberg. No surprises.
    • Born a Crime – Hilarious yet inspiring and heartwarming personal stories by Trevor Noah. Strongly recommended.Β πŸ‘
    • The Black Swan – It emphasizes the impact of rare events, which are often ignored by traditional forecasting
    • Origins –Β Fourteen billion years of history of the Universe.Β πŸ‘
    • How to Publish Your Book – Practical guides to publish a book.Β πŸ‘
  • Winning 1 competition – In Q2, I managed to participate in only one, the Quora Question Pair competition. My team finished 36th out of 3,307 teams.
  • Reading the BibleΒ βœ…
  • Writing a book on Kaggle (new)

Weekly Goals (new)

  • Reading 1 paper (new)
  • Writing 1 blog post (new)
  • Writing 5 pages of the Kaggle book (new)

Daily Goals

  • 20 pull-ups – 65% success with the average of 18.4 / day
  • 100 push-ups – 52% success with the average of 72.6 / day
  • 2 prayers – 5% success
  • QT – 45% success
  • Writing 1 article of any kinds (new)

Quora: What should I do to get into Google’s DeepMind team?

Read Jeong-Yoon Lee's answer to What should I do to get into Google's DeepMind team? on Quora

Goal Tracking App – Strides

Yesterday, I subscribed to a goal tracking app, Strides at $39.99 per year. Among hundreds of apps that I use, this is the third most expensive app after Yousician ($119 per year) and Dropbox ($99 per year). So, by my standard, it must be very useful.

Strides helps you set and track goals by either the occurrences (e.g. for smoking, smoked or not), target numbers (e.g. for reading, 1 book per month or total of 12 books in 2017), or milestones (e.g. for a website, research, design, development, and launch) over various time intervals.

The first screen is the dashboard that lists all the goals currently being tracked.Β Once a goal is selected, it shows the trend and progress of the goal based on the tracking method.

I like how simple and straightforward it is. Once downloaded, I was able to use it right away after spending just a couple of minutes.

Strides is available for free up to 10 goals with few limitations on tagging and filtering. Therefore, you can try it out before purchase.

If you can’t measure it, you can’t improve it.

Hope it helps you make improvements on your goals. Good luck! 😎

Quora: What are the Most Important Books for Startup Founders to Read?

Read Jeong-Yoon Lee's answer to What are the most important books for startup founders to read? on Quora

New Address –

I moved my blog from to

I’ve used since 1999. Ethiel (μ΄λ””μ—˜) was the name of a Christian student club at my high school.

After 18 years of sporadic blogging, I decided to make my blog more personal by using my name as its address.

I also write on I will continue to write on both.

I plan to post at least one article per week.

If you want to receive updates for either, please subscribe to the blog.

Let’s start the new era. 😎

2017λ…„ 1사뢄기 λŒμ•„λ³΄κΈ°

μ •λŸ‰μ  λͺ©ν‘œ

  • 200마일 λ›°κΈ°(29%) – ν˜„μž¬ 58마일 λœ€. κΌ­ 가지 λͺ»ν•  μ΄μœ κ°€ μ—†μœΌλ©΄ ν—¬μŠ€μž₯μ—κ°€μ„œ 2마일/20λΆ„μ”© λ›°μ—ˆλ‹€.
  • μ±… 24ꢌ 읽기 (38%) – ν˜„μž¬ 9ꢌ 읽음. μž‘λ…„λΆ€ν„° 읽던 μ±… 쀑 μ˜¬ν•΄ 마무리 지은 책이 4ꢌ μžˆλ‹€. μ˜¬ν•΄ λͺ©ν‘œλŠ” λ¬΄λ‚œνžˆ 달성할 λ“―.
  • μ„±κ²½ 1독 βœ… – 1독이라기보닀 1μ²­μ΄μ—ˆλ‹€.
  • 맀일 15λΆ„ 기도 – 세상에. ν•˜λ£¨μ— 15λΆ„ κΈ°λ„ν•˜λŠ” 것도 λͺ»ν•˜λ‹€λ‹ˆ. Q2μ—λŠ” μ΅œμš°μ„  μˆœμœ„λ‘œ 놓고 μ§€μΌœμ•Όκ² λ‹€.
  • λ°μ΄ν„°μ‚¬μ΄μ–ΈμŠ€ λŒ€νšŒ μž…μƒ 1회 (0%) – λŒ€νšŒ μ°Έμ—¬ν•˜λŠ” 것보닀 λŒ€νšŒμ— λŒ€ν•΄ λ°œν‘œν•˜λŠ”λ° μ‹œκ°„μ„ 많이 썼닀. Q2μ—λŠ” λ‹€μ‹œ λŒ€νšŒμ— κΎΈμ€€νžˆ 참여해야지.
  • 빚 XXX 갚기 (x%) – μ—΄μ‹¬νžˆ 갚자. μœΌμ‹ΈμœΌμ‹Έ.

Q2에 μƒˆλ‘œ μΆ”κ°€ν•œ μ •λŸ‰μ  λͺ©ν‘œ

  • 턱걸이 10개 (20%) – ν˜„μž¬ μΉ˜νŒ…ν•˜λ©΄ 5개, μ œλŒ€λ‘œ ν•˜λ©΄ 2개.
  • νŒ”κ΅½ν˜€νŽ΄κΈ° 50κ°œΒ βœ…

정성적 λͺ©ν‘œ

  • μ•„λ‚΄ μ„œμš΄ν•˜κ²Œ ν•˜μ§€ μ•ŠκΈ° – μ°Έ λΆ€λ„λŸ½λ‹€. λ§ˆμŒμ€ μ•ˆ 그런데 μ°Έ 아내와 μ•„μ΄λ“€μ—κ²Œ 잘 λͺ»ν•œλ‹€. 더 λ…Έλ ₯ν•΄μ•Όκ² λ‹€.
  • ν•˜λ‚˜λ‹˜κ³Ό κ°€κΉŒμ›Œμ§€κΈ° – 이것도 μ°Έ λΆ€λ„λŸ½λ‹€. μœ„μ— 기도뢀터 μ‹œμž‘ν•˜μž.
  • 건강해지기 – μ—°μ΄ˆ κ±΄κ°•κ²€μ§„μ—μ„œ 전년보닀 μ½œλž˜μŠ€ν…Œλ‘€ μˆ˜μΉ˜κ°€ 많이 μ’‹μ•„μ‘Œλ‹€. μΌν•˜κ³  μœ‘μ•„μ—μ„œ 슀트레슀 받지 μ•Šλ„λ‘ κ΄€λ¦¬ν•΄μ•Όν•˜λŠ”λ°, μš”μ¦˜ 일이 많이 λ°”μ˜κ³  좜μž₯도 μž¦μ•„μ„œ 쉽지 μ•Šλ‹€. μ§€λ‚œ μ£Ό μ‹œμ• ν‹€ 좜μž₯κ°”λ‹€ λŒμ•„μ˜€λŠ” λΉ„ν–‰κΈ° μ•ˆμ—μ„œ 잠깐 κΈ°μ ˆν•΄μ„œ 깜짝 λ†€λžλ‹€. μš΄λ™/식사/νœ΄μ‹μ— λͺ¨λ‘ 신경써야겠닀.
  • κ°€μ •κ΅νšŒ 잘 μΈλ„ν•˜κΈ° – μ—°μ΄ˆμ— μ˜μš•μ μœΌλ‘œ μ‹œμž‘ν–ˆλŠ”λ°,Β 3μ›”μ—λŠ” λ‚΄λ‚΄ 가쑱듀이 μ•„νŒŒμ„œ μ œλŒ€λ‘œ λͺ»ν–ˆλ‹€. λ‹€μ‹œ μ‹œμž‘ν•˜μž.
  • 기타/μ•…κΈ° 배우기 – μ—­μ‹œ μ—°μ΄ˆμ— μ˜μš•μ μœΌλ‘œ Yousician에 κ°€μž…ν•΄μ„œ μš°μΏ¨λ λ ˆλΆ€ν„° μ‹œμž‘ν–ˆλ‹€κ°€ 쀑간에 그만 λ’€λ‹€. λ‹€μ‹œ μ‹œμž‘ν•˜μž.

Q2에 μƒˆλ‘œ μΆ”κ°€ν•œ 정성적 λͺ©ν‘œ

  • μ•„μ΄λ“€μ—κ²Œ 화내지 μ•ŠκΈ° – 쉽지 μ•Šμ§€λ§Œ, λ…Έλ ₯ν•˜μž.

μ—­μ‹œ μ •λŸ‰μ  λͺ©ν‘œλ₯Ό μ„Έμš΄ ν•­λͺ©λ“€μ€ 비ꡐ적 잘 ν•˜κ³  μžˆλŠ” 반면, 정성적 λͺ©ν‘œμ— ν•΄λ‹Ήν•˜λŠ” ν•­λͺ©λ“€μ€ λ†“μΉ˜λŠ”κ²Œ λ§Žλ‹€. 정성적 λͺ©ν‘œλ“€λ„ μΈ‘μ •ν•  수 μžˆλŠ” 방법을 생각해 봐야겠닀.

μ–Έμ œλ‚˜μ²˜λŸΌ μ‹œκ°„μ€ λΉ λ₯΄κ²Œ κ°„λ‹€. 정신차리지 μ•ŠμœΌλ©΄ μ€‘μš”ν•œ 것듀을 λ†“μΉ˜λ©° 마λƒ₯ λ°”μ˜κ²Œ ν•˜λ£¨ ν•˜λ£¨ 보내기 쉽닀. 쓸렀가지말고 흐름을 타고 λ‚΄κ°€ μ›ν•˜λŠ” λ°©ν–₯으둜 갈 수 μžˆλ„λ‘ μ§‘μ€‘ν•˜μž.

2016λ…„ λŒμ•„λ³΄κΈ° – 일

2016년은 νšŒμ‚¬κ°€ 크게 μ„±μž₯ν•œ ν•΄μ˜€λ‹€.

  • 직원 수 26λͺ…μœΌλ‘œ 증가
  • 맀좜 3배둜 증가
  • 포좘 250/25/10 νšŒμ‚¬μ™€ 계약
  • $1MM+ 단일 계약 성사
  • $9MM μ‹œλ¦¬μ¦ˆ A 투자 유치

덕뢄에 λ‚˜λ„ μ•„μ£Ό λ°”λΉ΄λ‹€.

μ˜μ—… λ―ΈνŒ…κ³Ό 투자 λ―ΈνŒ…μœΌλ‘œ λ‰΄μš•, μ‹œμ• ν‹€, λ‹¬λΌμŠ€, λ””νŠΈλ‘œμ΄νŠΈ, 덴버, μƒŒλ””μ—κ³  λ“±μ§€λ‘œ 좜μž₯도 μž¦μ•˜λ‹€. 4μ‚¬λΆ„κΈ°μ—λŠ” λΉ‘λΉ‘ν•œ 계약 λ‚©ν’ˆ μŠ€μΌ€μ€„λ‘œ μ—°κ΅¬κ°œλ°œμ€ 거의 손을 놓아야 ν–ˆλ‹€.

μ•ˆ 쒋은 일도 μžˆμ—ˆλ‹€.

μ§€λ‚œ 4μ›”, μ°½μ—… CEOκ°€ λ¬ΌλŸ¬λ‚˜κ³  초기 투자자 쀑 ν•œ λͺ…이 CEOκ°€ λ˜μ—ˆλ‹€. κ²°κ΅­, μ°½μ—… CEOλŠ” μ˜¬ν•΄ μ΄ˆμ— νšŒμ‚¬λ₯Ό 떠났닀. 개인적으둜 4λͺ…μ˜ μ°½μ—… 멀버 쀑 κ°€μž₯ μΉœν–ˆκΈ°μ— μ•ˆνƒ€κΉŒμ›€μ΄ μ»Έλ‹€. ν•˜μ§€λ§Œ νšŒμ‚¬κ°€ 컀가며 μžˆμ„ 수 μžˆλŠ” λ§Žμ€ μ•ˆ 쒋은 일 쀑 ν•œ 가지이고 κ²°κ³Όκ°€ 더 μ•ˆ 쒋을 수 μžˆμ—ˆλ‹€κ³  μƒκ°ν•œλ‹€.

νšŒμ‚¬κ°€ μ»€κ°€λŠ” 것을 느끼며 맀일 λ‚˜μ—κ²Œ λ¬»λŠ”λ‹€.

  • λ‚˜μ™€ νŒ€μ€ νšŒμ‚¬μ˜ μ„±μž₯에 제 λͺ«μ„ ν•˜κ³  μžˆλŠ”κ°€
  • λ‚˜μ™€ νŒ€μ€ νšŒμ‚¬κ°€ μ„±μž₯ν•˜λŠ” 만큼 λΉ λ₯΄κ²Œ μ„±μž₯ν•˜κ³  μžˆλŠ”κ°€

2017년이 νšŒμ‚¬μ™€ λ‚˜μ™€ νŒ€μ—κ²Œ 졜고의 ν•΄κ°€ 되기λ₯Ό κΈ°λŒ€ν•œλ‹€.

μ±„μš© 단상

졜근 νŒ€μ— μ‹ μž… μžλ¦¬κ°€ 생겨 μƒˆν•΄ μ—°νœ΄ 직전 μ±„μš© 곡고λ₯Ό μ˜¬λ Έλ‹€.

μ•Œλ €μ§„ νšŒμ‚¬λ„ μ•„λ‹ˆκ³  μ—°νœ΄ 기간에 지원할 μ‚¬λžŒμ΄ μžˆκ² λ‚˜ μ‹Άμ—ˆλŠ”λ°, μ—°νœ΄ ν›„ μΆœκ·Όν•΄μ„œ 깜짝 λ†€λžλ‹€. 130μ—¬ λͺ…이 μ§€μ›ν•œ 것이닀.

이 μ£Ό 남짓 μ§€λ‚˜ μ–΄μ œ, 아직 μ±„μš©μ΄ 진행 μ€‘μ΄μ§€λ§Œ 곡고λ₯Ό λ‚΄λ Έλ‹€. μ§€μ›μž 수 401λͺ…. 인사과 없이 우리 νŒ€ 3λͺ…이 λŠ˜μ–΄λ‚˜λŠ” μ§€μ›μžλ₯Ό 감당할 수 μ—†μ—ˆλ‹€.

μ–΄λŠ 정도 후보ꡰ이 μ’ν˜€μ§€κΈ°λ„ ν–ˆλ‹€. μ§€λ‚œμ£Όμ™€ 이번 주에 각각 ν•œ λͺ…μ”© μ˜¨μ‚¬μ΄νŠΈ 인터뷰λ₯Ό μ§„ν–‰ν–ˆκ³  이 쀑 ν•œ λͺ…μ—κ²Œ 였퍼λ₯Ό 쀄 μ˜ˆμ •μ΄λ‹€.

μ§€μ›μžλ“€μ„ μŠ€ν¬λ¦°ν•˜κ³  μΈν„°λ·°ν•˜λ©° λŠλ‚€ 점이 μžˆλ‹€.

μ»€λ²„λ ˆν„°λŠ” μ§€μ›μžλ₯Ό μŠ€ν¬λ¦°ν•˜κΈ° κ°€μž₯ 쒋은 도ꡬ이닀. 100% μ±„μš©μ΄ λ˜λŠ” μ»€λ²„λ ˆν„°λŠ” μ—†μ§€λ§Œ 100% μŠ€ν¬λ¦°λ˜λŠ” μ»€λ²„λ ˆν„°λŠ” μžˆλ‹€.

예λ₯Ό λ“€μ–΄,

  • λ¬΄μ„±μ˜ν•œ μ»€λ²„λ ˆν„°: μ»€λ²„λ ˆν„°λ₯Ό μ œμΆœν•˜μ§€ μ•Šκ±°λ‚˜ ν•œ λ¬Έμž₯만 뚝 써놓은 μ»€λ²„λ ˆν„°λŠ” λ°”λ‘œ 슀크린. μ§€μ›μžκ°€ ν¬μ§€μ…˜μ— μ§„μ§€ν•œ 관심이 μ—†λ‹€κ³  μƒκ°ν•œλ‹€.
  • μ±„μš©κ³΅κ³ μ™€ λ§žμ§€ μ•Šμ€ μ»€λ²„λ ˆν„°: μ±„μš©ν•˜λŠ” ν¬μ§€μ…˜μ΄λ‚˜ 직급, μ‹¬μ§€μ–΄λŠ” νšŒμ‚¬ 이름을 잘λͺ» μ“΄ μ»€λ²„λ ˆν„°λ„ μžˆλ‹€. λ°”λ‘œ 슀크린.
  • μ±„μš©κ³΅κ³ μ˜ μš”κ΅¬μ‚¬ν•­κ³Ό μƒκ΄€μ—†λŠ” μ»€λ²„λ ˆν„°: μ±„μš©ν•˜λŠ” μž…μž₯μ—μ„œ κ°€μž₯ κΆκΈˆν•œ 것은 μš”κ΅¬μ‚¬ν•­μ„ μΆ©μ‘±ν•˜λŠ”μ§€ 여뢀이닀. 파이썬 μ–Έμ–΄λ₯Ό 잘 μ‚¬μš©ν•˜λŠ” 게 ν•„μˆ˜ μš”κ±΄μΈλ°, νŒŒμ΄μ¬μ— λŒ€ν•œ λ‚΄μš©μ΄ μ „ν˜€ μ—†λ‹€λ©΄ 슀크린.
  • 쿠킀컀터 μ»€λ²„λ ˆν„°: νšŒμ‚¬ μ΄λ¦„μ΄λ‚˜ μ§€μ›ν•˜λŠ” ν¬μ§€μ…˜λ„ μ–ΈκΈ‰ν•˜μ§€ μ•Šκ³  κ·ΈλŒ€λ‘œ 수백 ꡰ데 νšŒμ‚¬μ— 지원할 λͺ©μ μœΌλ‘œ μ“΄ μ»€λ²„λ ˆν„°. 온라인 양식을 κ·ΈλŒ€λ‘œ κ°€μ Έμ™”λŠ”μ§€ λ˜‘κ°™μ€ ꡬ쑰의 μ»€λ²„λ ˆν„°λ“€λ„ λ§Žλ‹€. μ—­μ‹œ 슀크린.

반면 λˆˆκΈΈμ„ λ„λŠ” μ»€λ²„λ ˆν„°λ„ μžˆλ‹€. 이런 경우 ν•œλ²ˆ 이야기해보고 μ‹Άλ‹€λŠ” 생각이 λ“ λ‹€.

  • 개인적인 μ»€λ²„λ ˆν„°: μžμ‹ μ΄ μ™œ 우리 νšŒμ‚¬μ™€ νŒ€, 이 ν¬μ§€μ…˜μ— 관심이 μžˆλŠ”μ§€ 잘 μ„€λͺ…ν•œ 경우.
  • λ§žμΆ€ν˜• μ»€λ²„λ ˆν„°: 무쑰건 “λ‚˜ μž˜λ‚¬μ–΄μš””κ°€ μ•„λ‹Œ, μžμ‹ μ˜ κ²½ν—˜κ³Ό λŠ₯λ ₯이 μ–΄λ–»κ²Œ μš”κ΅¬μ‚¬ν•­κ³Ό λ§žλŠ”μ§€ ꡬ체적으둜 μ„€λͺ…ν•œ 경우.
  • 열정이 λŠκ»΄μ§€λŠ” μ»€λ²„λ ˆν„°: 배우고 μ„±μž₯ν•˜λ €λŠ” κ°•ν•œ μ˜μ§€κ°€ λ“œλŸ¬λ‚˜λŠ” 경우. 학ꡐ μˆ˜μ—…μ΄λ‚˜ 직μž₯ μƒν™œμ— λ©ˆμΆ”μ§€ μ•Šκ³  κΎΈμ€€νžˆ 온라인 κ°•μ˜λ₯Ό μˆ˜λ£Œν•˜κ±°λ‚˜, μ˜€ν”ˆμ†ŒμŠ€ ν˜Ήμ€ 개인 ν”„λ‘œμ νŠΈμ— κΈ°μ—¬ν•˜κ±°λ‚˜, κ΄€λ ¨ λŒ€νšŒμ— μ°Έκ°€ν•˜κ±°λ‚˜ ν•œ 경우.

μ»€λ²„λ ˆν„°λŠ” μ±„μš© λ‹΄λ‹Ήμžμ—κ²Œ λ³΄λ‚΄λŠ” μ—°μ•  νŽΈμ§€μ΄λ‹€.

μ—°μ•  νŽΈμ§€λ₯Ό 보내며 μƒλŒ€μ˜ 이름을 λΆ€λ₯΄μ§€ μ•Šκ±°λ‚˜, 잘λͺ» λΆ€λ₯΄κ±°λ‚˜, μƒλŒ€λ°©μ˜ μ΄μ•ΌκΈ°λŠ” λ¬΄μ‹œν•˜κ³  λ‚΄ μ΄μ•ΌκΈ°λ§Œ ν•œλ‹€κ±°λ‚˜, λ‹€λ₯Έ μ‚¬λžŒλ“€μ—κ²Œλ„ λ˜‘κ°™μ΄ λ³΄λƒˆμ„ 것 같은 μ„±μ˜ μ—†λŠ” νŽΈμ§€λ₯Ό 보내면 μ–΄λ–»κ²Œ λ˜κ² λŠ”κ°€.

μƒλŒ€λ°©μ—κ²Œ 개인적으둜 λ‹€κ°€κ°€μ„œ μ–΄λ–»κ²Œ μžμ‹ μ΄ μƒλŒ€λ°©μ˜ ν•„μš”λ₯Ό μΆ©μ‘±μ‹œν‚¬ 수 μžˆλŠ”μ§€ μžμ‹ μ΄ μ–Όλ§ˆλ‚˜ 열정적인 μ‚¬λžŒμΈμ§€ 보여야 λ˜μ§€ μ•Šμ„κΉŒ?

κ²°λ‘ : μ—°μΈμ—κ²Œλ‚˜ μ±„μš© λ‹΄λ‹Ήμžμ—κ²Œλ‚˜ μ—°μ•  νŽΈμ§€λ₯Ό μ„±μ˜μžˆκ²Œ 잘 μ“°μž. πŸ™‚

2017λ…„ λͺ©ν‘œ

2017λ…„μ—λŠ” λ‹€μŒκ³Ό 같은 λͺ©ν‘œλ₯Ό μ„Έμ› λ‹€.

μ •λŸ‰μ  λͺ©ν‘œ

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정성적 λͺ©ν‘œ

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2017년도 ν™”μ΄νŒ…!