About me

  • Nickname: HLETRD
  • GitHub Facebook Email

  • Double majoring in Electrical and Computer Engineering at Seoul National University (2017~)

  • Minoring in Astronomy at Seoul National University (2017~)
  • Majoring in Biological Science at Seoul National University (2016~)
  • Graduated Gyeonggi Science High School (2016)

Skills & Works

Photography (2013~)

Astrophotography (2016~)

  • Deep Sky, Landscape astrophotography
  • Messier Project

Programming

Python 2/3 (2015~)

  • The language I’ve fallen in love with.
  • Also skilled in various frameworks. (Flask, Django, Numpy, Scipy, PyQt5, AstroPy …)
  • Miscellaneous works are on my GitHub
JubeatInfo Clan (https://jubeatinfo.com) (2017~)
  • Based on Python 2, Flask, MongoDB
  • 300+ users
  • Website provides personalized stats & records of Jubeat Clan.
QubellInfo (https://q.jubeatinfo.com) (2016~2017)
  • Based on Python 2, Flask, MongoDB
  • 1000+ users
  • Website provides personalized stats & records of Jubeat Qubell.
Acrux (https://github.com/hletrd/Acrux) (2017)
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)

C# (2017~)

NanoFocus ASCOM drivers
NanoFocus PC console

PHP5, PHP7 (2014~)

XpressEngine contributor (2016)
DDR Info (https://github.com/hletrd/DDR-Info) (2015)
  • Based on PHP, MySQL
  • 200+ users
  • Website provides personalized stats & records of Dance Dance Revolution.
YOTTA (https://github.com/hletrd/YOTTA) (2015)
  • Based on PHP, MySQL
  • Fully encrypted file storage.

Java/Android (2014~)

  • Swing / AWT
TabletDroid (Play store) (2014)
  • Make your Android phone to be used as a tablet(input device.)
  • PC client is based on Visual Basic 6

Javascript (2013~)

Awkward billiard (Experimental) (https://0101010101.com/labs/billiard/) (2015)
  • Based on HTML5 + Javascript
  • Awkward…

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 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, C++, especially for OpenCL, CUDA, and embedded(ARM Cortex-M, AVR)
    • Assembly (x86(little), AVR, ARM Thumb-2)

Careers