- Name: Jiyong Youn (윤지용)
- Nickname: HLETRD
- Contacts
- Language
- Korean (Native)
- English (Fluent)
- Works
-
- Developer, Puzzle Monsters Inc. (2024. 04. -)
- System Engineer, Perigee Aerospace Inc. (2023. 11. – 2024. 04.)
- CEO & Founder, Xylolabs (2022.09. – 2024.05.)
- Selected for the Entrepreneurs Support Program in Hanyang University (한양대학교 예비창업자 지원사업) in 2022
- Selected for LG CNS Startup Monster in 2021
- Research Project with Korea Forest Research Institute (국립산림과학원) in 2020
- Seoul National University X-Corps: Awarded 3rd place twice (2020, 2022) and 1st place twice (2019, 2021) as a team.
-
- Educations
- Ph.D. candidate in Electrical and Computer Engineering, Seoul National University (2020 -)
- Virtual Machine and Optimization Lab., Advisor: Prof Soo-Mook Moon
- B.S. in Electrical and Computer Engineering, Seoul National University (2020)
- Graduated Gyeonggi Science High School (2016)
- Ph.D. candidate in Electrical and Computer Engineering, Seoul National University (2020 -)
Skills & Works
Hardwares
- From designing to manufacturing of electrical circuits, including PCB designing, and programming of embedded microcontrollers/FPGA.
- Experiences in STM32, FPGAs, ESP32, ESP8266 microcontrollers, AVRs, Arduinos, …
- PCB EDA: Prefer Altium Designer, EasyEDA as an EDA tool.
- 3D CAD/CAM: Prefer SolidWorks and Autodesk Fusion 360 for 3D product design and Autodesk AutoCAD for 2D design.
- Raspberry Pi
- Developed NanoFocus, an electronic focuser controller for astrophotography.
- Developed focusing system & filter control system for SNU CEOU 24inch telescope
- Designed and built motor controlling hardware.
- Developed ASCOM PC driver using C#, control GUI using web with Python 3 / Flask backend.
Softwares
- Python
- C#
- PHP
- Java
- Kotlin
- Android
- Javascript
- React
- Express
- CUDA / OpenCL
- Go
- C++
- MATLAB
- All projects listed below are solely developed, unless otherwise mentioned.
Python 2/3 (2015-)
- Also skilled in various frameworks. (Flask, Django, Numpy, Scipy, PyQt5, AstroPy …)
- Contributor of AstroPy.ccdproc
- Additional projects are available on my GitHub
VMO lab intranet (https://vmo.snu.ac.kr) (2021)
- Intranet website based on Python 3, Django
Spectools (https://github.com/hletrd/spectools) (2017)
- Spectral analysis tools for astronomy, based on Python and AstroPy.
JubeatInfo Festo (https://jubeatinfo.com) (2018-)
- Website providing personalized stats & records of Jubeat Festo.
- Based on Python 2, Flask, MongoDB
- 500+ active users
JubeatInfo Clan (http://c.jubeatinfo.com) (2017-2018)
- Website providing personalized stats & records of Jubeat Clan.
- Based on Python 2, Flask, MongoDB
- 300+ active users
QubellInfo (http://q.jubeatinfo.com) (2016-2017)
- Website providing personalized stats & records of Jubeat Qubell.
- Based on Python 2, Flask, MongoDB
- 1000+ active users
Acrux (https://github.com/hletrd/Acrux) (2017)
- Based on Python3, PyQt5, PySerial
- PC controller for CRUX-170HD / CRUX-320HD harmonic drive equatorial mount.
PyPreprocessor (https://github.com/hletrd/PyPreprocessor) (2017)
- Based on Python 3, Astropy, Numpy,
- Various scripts for processing observational data for astrophotography as well as astrophotometry.
Neural Style Online (https://github.com/hletrd/neural_style) (2015-2016)
- Based on the Lua/Torch implementation of neural style, and Python 2, Flask, MongoDB
- Covered up to 1000+ sessions, and handled over 40000 total sessions
- Service discontinued
Others
- Outsources projects.
-
- TheChairs, LENIF (2018-2023)
- Developed an hardware to monitor user’s pose from chair, and developed an Android App collect the data via BLE on smartphone.
- Used Python 3, Java, C++
- SITUDY (2018)
- Developed web frontend and visualization systems for study time monitoring service
- TheChairs, LENIF (2018-2023)
-
ARM Cortex M (2018-)
STM32 Pro Mini dev board (https://github.com/hletrd/STM32ProMini) (2020-)
- Designed & built a development board using STM32, compatible with Arduino Pro Mini
- Arduino core and a bootloader for USB HID flasher is available.
Golang (2021-)
Ethereum benchmarking environment (https://github.com/hletrd/go-ethereum-sim) (2021-)
- A forked Go-Ethereum client to support local replay of the entire blockchain.
C# (2017-)
NanoFocus ASCOM drivers
- Developed custom ASCOM (Astronomy Common Object Model) drivers and PC console for NanoFocus electronic focuser (which is also self-developed), enabling compatibility with the most popular astronomy softwares
- Currently installed in the SNU CEOU 24-inch telescope.
PHP5, PHP7, PHP8 (2014-)
SAO Weather Monitor (2018-)
- Automated weather monitor for SNU Astronomical Observatory
XpressEngine contributor (2016)
DDR Info (https://github.com/hletrd/DDR-Info) (2015)
- Website provides personalized stats & records of Dance Dance Revolution.
- 200+ users
- Based on PHP, MySQL
YOTTA (https://github.com/hletrd/YOTTA) (2015)
- Fully encrypted file storage.
- Based on PHP, MySQL
River temperature API Link to API documentation (2015)
- API providing water temperature of rivers in Korea.
RFLP Designer Demo
- Simple tool to design and simulate RFLP(
Restriction Fragment Length Polymorphism) experiment, a very-common experiment in molecular biology.
Java/Kotlin/Android (2014-)
- Swing / AWT
TabletDroid (Link to Play store) (2014)
- Make your Android phone to be used as a tablet(input device.)
- PC client is based on Visual Basic 6
- Taken down due to Google Play policy update
Javascript (2013-)
Ethereum analyzer https://github.com/eth4ne/eth-analysis (2022)
- DB dump & analysis tool for Ethereum blockchain
Voice identification demo https://lgcns.xylolabs.com (2021)
- Voice identification tool to verify an user via reading a short phrase
- Developed front-end, using React.
Awkward billiard (Experimental) (https://0101010101.com/labs/billiard/) (2015)
- Based on HTML5 + Javascript
- Awkward…
Simple word test (https://0101010101.com/labs/wordtest) (2013-2015)
- Simple tool to memorize words fastly
TT4Them https://hletrd.github.io/TypingTutor4Them/ (2016)
- IME-independant typing tutor application, running in browser.
- Source code
HangangSwim (Link to Pebble App Store) (2016)
- Based on Pebble.JS SDK
- Simple app displaying water temperature of nearest river, with KOSPI/KOSDAQ informations.
GPU computing (2015-)
- Moderately skilled in CUDA, OpenCL
Git hash miner (https://github.com/hletrd/gitminer-cuda) (2021)
- To practice CUDA…
- Found a lowest SHA1 hash (probably):
00000000000000c06d2e8c36f247206a9a4b1c63
GPUPhotometry (https://github.com/hletrd/GPUPhotometry) (2015)
- Based on C + OpenCL + GTK+ + CFITSIO
- Very fast CCD data reduction with GPU computing
MD5 maxmin solver (https://github.com/hletrd/md5-maxmin) (2015)
- Based on C + OpenCL/CUDA
- Now holding records for known MD5 extreme values.
- Max:
md5(0DbB^a2hxjdc_JiyongYoun-HLETRD) = fffffffffffffec29931c5489a14a02e
- Min:
md5(08ni(g0u3ada_JiyongYoun-HLETRD) = 00000000000000d4a49581c7f0638557
- Popcount max:
md5()to0wzR*x[L{WJ^y5G>B-HLETRD) = fb9fdfff13efffffffdfffe2efeffaff
- Popcount min:
md5(hhQ1/'jy5W^G[zwJ*RBL-HLETRD) = 0000098a020401801208448010004024
- Bytesum max:
md5(wWrC--3mn-a000000000-HLETRD) = fffae5f0faf8f9f5e6f0fafbf7f8e7f6
- Bytesum min:
md5(Gs4u^x4mn{4000000000-HLETRD) = 0405041602140309020a3c071702070a
- …and a few other languages not listed above…
- C(2010-), C++(2011-), especially for OpenCL, CUDA, and embedded systems(ARM Cortex-M, AVR)
- Assembly newbie (x86, AVR, ARM Thumb/Thumb-2)
- Visual Basic(2009-)… for XP-compatible applications…
- HTML5, CSS, JS (For web dev)
Others
Had prefered CentOS/RHEL than Ubuntu- But Ubuntu is more convenient now…
- Prefer Git as VCS.
- Prefer MariaDB along various RDBMSs.
- Prefer MongoDB and Firebase along many NoSQLs.
- Love Adobe CC products, especially Photoshop, Lightroom, Premiere, and Audition.
- Use PixInsight as post-processing tool for astrophotography.
- Participant, and gold medal winner of IBO 2014
- Feel free to contact me if you are past IBO participant.
- Use Visual Studio Code as the main text editor.
- Migrated from Sublime Text 3