Writings
Judge the value of your company
After founding and forming my startup, I left my company. As the company found Product-Market-Fit, it operates well without my day-to-day monitoring. Setting...
Leader To Follower
Over my entrepreneurial journey, I have been in a leadership position to decide where to head myself and my team. Most of the time, I have been thinking abou...
Rold of AI&ML in forecasting
When it comes to predicting or forecasting something, folks—including marketers, customers, and especially investors—really like to hear that a product is us...
Statistical Modeling and Objective function
Through forecasting projects, I’ve learned a crucial lesson that’s often overlooked in introductory courses: your model is only as good as its loss function,...
Understanding XGBoost: A Deep Dive into the Mathematics and From-Scratch Implementation
Note: This post is initially composed with deep research and finalized by me.
My Expert Forecasts Got Crushed by a Dumb Algorithm
Note: This post is initially composed with deep research and finalized by me.
Forecasting Accuracy Metrics
Note: This post is initially composed with deep research and finalized by me.
The Linear Gaussian State Model: Dynamic Systems
Note: This post is initially composed with deep research and finalized by me.
How to review code in data science
Code review in software engineering is an essential part of the development process. It helps ensure code quality, facilitates knowledge sharing, and promote...
Hilbert Spaces in Time Series
Note: This post is initially composed with deep research and finalized by me.
Explanatory vs. Predictive Modeling: A Guide for the Machine Learning Engineer
Note: This post is mainly written with deep research.
Lesson After End and Before New Start
I stepped away from my startup, hexafarms, which I founded and developed most of the foundational technology for from the beginning. It has been almost a 4-y...
How to Set Up a Custom Domain on GitHub Pages with Namecheap
Today, I went through the process of connecting my custom domain, huijo.xyz, to my GitHub Pages site. It’s a common task for developers looking to personaliz...
Prediction Interval, Confidence Interval
Prediction Interval and Confidence Interval
A Guide to Hierarchical Forecasting
In many real-world scenarios, time series data follows a hierarchical or grouped structure where individual series must sum up to form aggregate series. For ...
Real experiment over job search
My 3-Week Job Search Journey: A Data-Driven Reflection
P Value
The Qustion P-value is common in scientific researches, but it’s not often used in the practical data science. Why?
How to Use Obsidian using Gdrive as Valut in Linux
To use obsidian across multi platform and multi device without using subscription, G-Drive is a good solution as DB.
Job Applications with AI: My Cover Letter Generation Agent
The Problem Writing cover letters sucks. Each one took me 45+ minutes of:
Predict the future
Stephen Hawking’s thoughts on whether we can predict the future, from his book Brief Answers to the Big Questions, really stuck with me. As someone who works...
Copy-Paste SSH registration list
I keep this content for myself. I notice that I have been repeating this process, so want to follow this for myself and anyone I need to advise/guide later.
Secret to Success: Focus
Throughout my career and learning from other entrepreneurs, I’ve realized failure rarely comes from working hard—it happens when we focus on things that don’...
How to Build a Team: A Resource Optimization Perspective
When building a team, two fundamental approaches emerge: Recruiting individuals whose skills precisely match predefined tasks Aligning all team members ...
Distributed Data Parallel: Scaling AI Model Training
What truly makes for a better AI model? It’s a multifaceted journey, beginning with good data and winding through the intricacies of data processing, model a...
Beyond mAP: Better Evaluation of Bbox
In my experiences with computer vision models, evaluating the performance of instance segmentation or object detection models has predominantly relied on a m...
ViT vs CNN: A Technical Deep Dive for High-Resolution Vision Tasks
This isn’t just theory—it’s battle-tested. Over years of deploying vision systems for farming applications, I’ve learned one truth: architecture choice makes...
Knowledge Distillation: A Comparative Exploration and the Role of Soft Targets
Knowledge Distillation is a process that refines large, complex models into smaller, efficient ones without losing much of the original performance. The conc...
Relative Theory
Understanding Relativity: My note into the Depths of Space and Time
Conformal Prediction
The Concept of Conformal Prediction
Data Science in Elixir
Transitioning from Python to Elixir in Data Science Data processing is often dominated by Python and libraries like pandas and spark. However, Elixir is emer...
Law of Human Nature
Let’s understand the laws of human nature. This will help me understand myself first and then others.
Stereo Vision
Building a DIY Depth Camera
Understanding Strawberry Yields with Statistical Distributions
Introducing Statistical Distributions in Agriculture
Limitations of Autoregressive LLMs
Autoregressive Language Models (LLMs) have their limitations. While they are fascinating and undoubtedly useful, they fall short in key areas that define int...
Statistics 1
State Population and Murder Rates
Guide to install and run Termin bot
Simplifying the Berlin Visa Appointment Process with Automation
Exponential Achievement
In the era of the flood of information, we have faced and partially experienced how one can achieve a lot. I have been a big fan of Flow which tells one to f...
Art of Hiring II
I used to be a job seeker. I complained a lot why it takes so much time to find a job. I had to look for companies from platforms such as Linked, Xing and al...
Seeking for Higher
Basically people seek for higher. This tendency is part of human nature. We, as human beings, forget the value of what we have. Every time we achieve somethi...
니체
내체가 내게 두고간 문구들을 아래와 같이 남긴다.
Get Rid Of Emotion
What is the emotion?
Find out What really matters
In business, life, and friendships, we often look at what causes good and bad outcomes. When I was researching ways to make model performance better, I tried...
Art of Hiring
Hiring is an art that goes beyond evaluating applications and conducting interviews. The process entails understanding organizational needs, company culture,...
Second Thought On Productivity
Productivity for me doesn’t mean more works get done. When one can enjoy the journey, then it is truly productive.
How to control your mindset after vacation
Vacation is always sweet. You enjoy the off days and should get back to your life. Often I felt it is uncomfortable to restart my work life. It is very likel...
What makes difference in Business tip and travel
I am writing this blog in the train to Velno, Holland. It is a business trip to set up the solution in the customer’s facility. Traveling along train inside ...
Python Class Method
Knowing a few fundamental Python methods help make better code.
Second Thought: Gig Economy
Let’s think of a scene working in a famous vacation spot working on a freelancing job and having a party in the evening. Quite many people around me have a f...
Is Hacking Bad System Fine?
Hacking is not the right thing. Oxford Dictionary defines hacking as the gaining of unauthorized access to data in a system or computer. As a developer, I k...
Relation between Writing and Thinking
It is the age of generative AI. One of the hot issues is by far GPT series. It provides somehow general AI (of course it is still very far from the original ...
Train Brain first
Syllogism (A is B and B is C. then A is C) sounds obvious but often people don’t realize it. The book Kluge written by Gary Marcus brings up the concept of “...
How brain changes
Brain’s depth has become shallow. This happens mainly due to the way how people live. People use computers through Operating Systems such as Linux, Windows, ...
Retrorepsective Self Analysis myself
There are often multiple versions of me to folks. Let’s start with the most common example: I.
Social Inequality
In the current economic system, inequality is one of the hottest potatoes. Big wealth generates bigger wealth, so the gap between two groups under different ...
How to Talk to Anyone
Book summary of starting a talk.
Balance Of Collaboration
How do you collaborate?
What makes mind differ
Your mind decides whether what you are doing now makes you happy or stressed. One of the vivid cases is the different perspectives between a business trip an...
Journey to Flow state
In positive psychology, a flow state, also known colloquially as being in the zone, is the mental state in which a person performing some activity is fully i...
Don’t follow the metric in research papers: Vision Transformer
Every year, plenty of research papers are released, boasting their metric (IoU, Precision, recall, …) which beats the last state-of-the-art. When I jumped in...
End of 2022
Of 32 years of my life, 2022 is by far the most exciting and special year. It is an essential step to summarize the year because it won’t be as special as to...
Paper Review - Attential Is All You Need
As a machine learning engineer, it’s fun to know the history of machine learning. It starts from perceptron and the challenge of XOR. ReLU appears, and CNN, ...
Paper Review - Deep Learning is Not All You Need
There is one rule of thumb in Deep Learning research. The deep the model is, the better it performs. This is generally correct if it doesn’t overfit too much...
Fear Of Missing Out
Human Psychology is important in every deal.
Role of plan and trust in business
Does plan matter in business?
AI service
As a CTO of AI-first-company, my first approach to solve problems was AI. However, in my iterations of trials and errors, purely relying on AI normally resul...
Reason is essential
Any Lame Excuse is helpful because of “Because justification”
SteelMan
People think in a similar manner
Relation of Ignorance and Evaluation
It is not necessarily bad, even if you couldn’t understand it.
Start with Why
Focus on what We make great computers. They're beautifully designed, simple to use and user-friendly. Wanna buy one? But this is not what the inspiring lead...
A series of choices
Everyone has his/her history. When one is young, the direction of one’s life is decided by one’s guardian. Meanwhile, the distance one goes through still de...
How one likes another
인간의 심리를 이해하고 그를 활용해야 더 지혜로운, 만족스러운, 그리고 성공적인 삶을 보낼 수 있다. 내가 파악한 세가지를 정리하고, 어떻게 활용하면 좋을지 적어보겠다. 1. 자주 보는 것만으로도 타인에 대한 호감이 올라간다. TV에서 자주 볼 수 있는 연예인들에 대해 우리는 호감...
BOLD2
미래의 성공을 잘 예측하는 것 상대방의 성공여부를 파악해야 하는 경우라면, (채용면담 또는 투자심사시) 지원자가 미래에 하려는 일보다는 과거에 한 일에 관심을 갖는다. 뭔가를 하는것은, 하겠다고 말만 하는 것보다 훨씬 중요하다.
Good Design
좋은 디자인은 시간에 구애받지 않는다. 미래의 세대에도 통하는 어떤것을 만들고싶다면, 이전세대에도 통할만한 것을 만들어야 한다.
Variables affecting human behaviors
One of the most common topics to start a conversation is the weather. Weather is changing periodically so that people know how the average weather looks lik...
Lessons from myself
Predict the direction of my life is quite difficult. Sometimes I wonder if this is the right direction. However, after considering these will be one of subch...
BOLD
Skunk Works 어려운 목표: 전 세계적 난관이 곧 전 세계적 사업기회이다. 큰 목표는 개인의 가치와 그 목표가 이루려는 결과가 서로 일치할 때 가장 좋은 효과를 낸다. Reid Hoffman (founder of LinkedIn): 당신의 첫번째 버전 제품이 부끄럽지 ...
Learning Language
My lesson in learning new languages
What matters in life?
What matters in life?
Free to Focus
Know what to do Concretize your future Sketch (Imagine) the story of your desired future as detailed as possible. Find your motivation in people, tools...
Morality in market economy
시장경제의 아래에서는 모든 상호간의 거래가 수요와 공급의 적정점에서 이루어지므로, 누군가 피해를 보지 않는다면 성공적이라 할 수 있다. 여기서 도덕성이라는, 수요와 공급의 반복의 과정에서는 다소 상이한 개념인, 것이 적용되면 확실한 옳고 그름을 판단하기가 어려워진다. 삶과 죽음...
Lesson from Startup in the last half year
Countless jobs exist in the world. Some work for one of the countless jobs in one’s life, and some work for a few jobs of them. Another job title, so calle...
Keep your friends close and your enemies closer.
It’s better to know better something disturb and annoy you. People tend to believe that they know themselves. However, the more one contemplate for yourselve...
Value_invest
주린이 이면서도, Computer scientist로써 읽는 투자 기초서는 정말 insightful 했다. 이번에 접한 책은 “가치투자자 아빠에게 워런 버핏과 찰리 멍거의 지혜를 배우다”이다. 가치투자에 관한 Warren Buffett과 Charlie Munger를 통한 개념과 ...
Science of Wellbeing
The science of well-being is one of the topics I have been reading and thinking often. Good job, good salary, properties, good grade, true love, and perfect...
거꾸로읽는 세계사
1. 프랑스 드레퓌르 대위 사건 진실이 승리한다 이 말은 반만 맞는 것일지 모른다. 기득권의 이해 관계에 따라, 진실이 아닌, 그들이 원하는 것들이 당장은 승리하게 될 수 있기 때문이다. 물론, 장기간을 본다면, 드레퓌르 사건처럼 결국 진실이 밝혀지고 정의가 승리하는 것 처럼 보일...
Out of My Skull: The Psychology of Boredom
James Danckert와 John D. Eastwood는 지난 20년간 지루함이라는 우리가 무심코 알고 있으나, 연구주제로써는 생소한 분야에 대해 집중해왔다. 이 책은 방대한 양의 참고문헌을 토대로 작성된 지루함에 관한 모든 것을 담고 있다. 생활에 있어 생산성, 효율성, ...
Study in Germany
독일 유학을 결심할때, 많은 사람들의 블로그를 보며 내가 어떻게 해나갈지에 대한 그림을 그려보곤 했다.
Polymath
폴리매스는 어감에 따라, 두가지로 정의가 가능하다.
Lessons for the 21st Century
1. Disillusionment Truth is, I just don’t understand what’s going on in the wrold. People become impatient or bored by all the talk of AI, Big data, bio...
Decision on X-mas eve
It has been quite a long time to journal on this page.
Mind Control
새로운 곳에서 모든것이 새로워서 인지, 하루 하루에 항상 감사하며 보내왔다.
Thought on time
독일어 숙제하기에 앞서, 많은 생각이 교차하여 이렇게 갑작스레 글을 쓰게 되었다.
Init: Germany
이 글을 남기는 것은, 19년 10월 8일이다.
Freud
유유 출판사의 명작시리즈 3선 (종의기원-다윈, 꿈의해석-프로이트, 자본론-마르크스)을 인터넷주문한지 시간이 꽤나 흘렀지만, 거의 한달가까이 꿈의해석에서 멈춰있다.
Init: Writing
최근들어 삶의 패턴을 바꿔서, 긍정적인 습관을 만들려 하고 있다.