- Name: Jiyong Youn (윤지용)
- Nickname: HLETRD
- Contacts
- Language
- Korean (Native)
- English
- B. S. in Electrical and Computer Engineering at Seoul National University (2020)
- Graduated Gyeonggi Science High School (2016)
Hobbies
Motorcycle (2018-)
- 2017 Honda CB650F (2019.05. -)
- 2016 Yamaha MT-03 (2019.02. – 2019.05.)
- 2018 Honda Super Cub (2018.09. – 2019.02.)
Photography (2013-)
Astrophotography (2016-)
- Deep Sky, Landscape astrophotography
- Messier Project
- Bronze medal winner of 27th astronomical photo contest from KASI
- AAPOD² winner of 2019-06-04 Eta Carina Nebula
- AAPOD² winner of 2019-02-10 Widefield view of Auriga
- AAPOD² winner of 2018-10-25 Around Eta Carina Nebula
- AAPOD² winner of 2018-08-29 IC 2177: Seagull Nebula
- AAPOD² winner of 2018-04-01 Widefield view of Gemini
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 as EDA tool.
- 3D CAD/CAM: Prefer SolidWorks and Autodesk Fusion 360 for 3D product design and Autodesk AutoCAD for 2D design.
- Raspberry Pi
- Low performance and low durability(compared to Cortex-M/R based controllers), but…it’s just cheap!
- Outsourced projects…
- Developed NanoFocus, an electronic focuser controller for astrophotography.
- Developed focusing system & filter control system for SNU CEOU 24inch telescope
Programming
Python 2/3 (2015-)
- The language I’ve fallen in love with.
- Also skilled in various frameworks. (Flask, Django, Numpy, Scipy, PyQt5, AstroPy …)
- Contributor of AstroPy.ccdproc
- Miscellaneous works are on my GitHub
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+ users
JubeatInfo Clan (http://c.jubeatinfo.com) (2017-2018)
- Website providing personalized stats & records of Jubeat Clan.
- Based on Python 2, Flask, MongoDB
- 300+ users
QubellInfo (http://q.jubeatinfo.com) (2016-2017)
- Website providing personalized stats & records of Jubeat Qubell.
- Based on Python 2, Flask, MongoDB
- 1000+ 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
- Service discontinued
Others
C# (2017-)
NanoFocus ASCOM drivers
NanoFocus PC console
Outsourced projects
PHP5, PHP7 (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
Outsourced projects
Javascript (2013-)
Hungry creator https://atik.kr/hungry/ (2018)
- …
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
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)
BrainFuck
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