Profile

Senior in Computer Engineering from KUT

Military Service Status : Unfulfilled

CV : [PDF] (as of May. 2019)

   
Email kozistr@gmail.com
Github https://github.com/kozistr
Linkedin https://www.linkedin.com/in/kozistr
Kaggle https://www.kaggle.com/kozistr
Facebook https://www.facebook.com/kozistr
SideShare https://www.slideshare.net/KimHyeongChan
Another Blog http://zer0day.tistory.com

Interests

Machine Learning, Computer Vision, Natural Language Processing, Sound Synthesis

Security Researches, Reverse Engineering


Publications

Conferences/Workshops

[1] kozistr_team, NAVER NLP Challenge 2018 SRL Task

  • SRL Task, challenging w/o any domain knowledge. Presented about trails & errors during the competition

Journals

[1] zer0day, Windows Anti-Debugging Techniques (CodeEngn 2016) Sep. 2016. PDF

  • Wrote about lots of anti-reversing / debugging (A to Z) techniques avail on window executable binary

Challenges & Awards

Machine Learning

  • NAVER NLP Challenge :: NAVER NLP Challenge 2018
  • A.I R&D Challenge :: A.I R&D Challenge 2018
    • Final - Fake or Real Detection - as Digital Forensic Team
  • NAVER A.I Hackathon :: NAVER A.I Hackathon 2018
  • TF-KR Challenge :: Facebook TF-KR MNIST Challenge


Hacking

  • Boot2Root CTF 2018 :: 2nd place (Demon + alpha)
  • Harekaze CTF 2017 :: 3rd place (SeoulWesterns)
  • WhiteHat League 1 (2017) :: 2nd place (Demon)
    • Awarded by 한국정보기술연구원 Received an award of $3,000

Work Experience

Company

Machine Learning Engineer, VoyagerX Intern, (2019.01 ~ 2019.xx)

  • Developed speaker verification models & diarization algorithms for speaker diraization
  • Developed hair swapping / reconstruction & semantic segmentation models

Penetration Tester, ELCID, (2016.07 ~ 2016.08)

  • Penetrated some products related to firewall


Out Sourcing

Korean University Course Information Web Parsing (About 40 Universities). 2 times, (2017.7 ~ 2018.3)


Lab

HPC Lab, KoreaTech, (2018.09 ~ 2018.12)

  • Wrote a paper about improved TextCNN model for predicting a movie rate

Research Experience

[1] Kim et al, CNN Architecture Predicting Movie Rating, 2019. 01.


Personal Projects

Computer Languages

Python
C/C++
Assembly (x86, x86-64, arm, …)
experienced with more than 10 languages

Machine Learning

Generative Models

  • GANs-tensorflow :: Lots of GAN codes :) :: Generative Adversary Networks
    • ACGAN-tensorflow :: Auxiliary Classifier GAN in tensorflow :: code
    • StarGAN-tensorflow :: Unified GAN for multi-domain :: code
    • LAPGAN-tensorflow :: Laplacian Pyramid GAN in tensorflow :: code
    • BEGAN-tensorflow :: Boundary Equilibrium in tensorflow :: code
    • DCGAN-tensorflow :: Deep Convolutional GAN in tensorflow :: code
    • SRGAN-tensorflow :: Super Resolution GAN in tensorflow :: code
    • WGAN-GP-tensorflow :: Wasserstein GAN w/ gradient penalty in tensorflow :: code
    • … lots of GANs (over 20) :)

Super Resolution

  • Image Super Resolution :: Image Super Resolution
    • rcan-tensorflow :: RCAN implementation in tensorflow :: code
    • ESRGAN-tensorflow :: ESRGAN implementation in tensorflow :: code

Style Transfer

  • Image-Style-Transfer :: Image Neural Style Transfer
    • style-transfer-tensorflow :: Image Style-Transfer in tensorflow :: code

Text Classification/Generation

  • movie-rate-prediction :: Korean sentences classification in tensorflow :: code
  • KoSpacing-tensorflow :: Automatic Korean sentences spacing in tensorflow :: code
  • text-tagging :: Automatic Korean articles categories classification in tensorflow :: code

Speech Synthesis

  • Tacotron-tensorflow :: Text To Sound (TTS)
    • tacotron-tensorflow :: lots of TTS models in tensorflow :: code

Speech Recognition :: Speech Recognition

  • [private] :: noisy acoustic speech recognition system in tensorflow :: code

Optimizer

  • AdaBound :: Optimizer that trains as fast as Adam and as good as SGD
    • AdaBound-tensorflow :: AdaBound Optimizer implementation in tensorflow :: code

Kaggle Challenges

Plug-Ins

IDA pro plug-in - Golang ELF binary (x86, x86-64), RTTI parser

  • recover stripped symbols & information and patch byte-codes for being able to hex-ray

Open Source Contributions

  • syzkaller :: New Generation of Linux Kernel Fuzzer :: Minor contribution #575

Security, Hacking

CTFs, Conferences

  • POC 2016 Conference Staff
  • HackingCamp 15 CTF Staff, Challenge Maker
  • CodeGate 2017 OpenCTF Staff, Challenge Maker
  • HackingCamp 16 CTF Staff, Challenge Maker
  • POX 2017 CTF Staff, Challenge Maker
  • KID 2017 CTF Staff, Challenge Maker
  • Belluminar 2017 CTF Staff
  • HackingCamp 17 CTF Staff, Challenge Maker
  • HackingCamp 18 CTF Staff, Challenge Maker

Teams

Hacking Team, Fl4y. Since 2017.07 ~

Hacking Team, Demon by POC. Since 2014.02 ~ 2018.08


Presentations

2018

[2] Artificial Intelligence ZeroToAll, Apr 2018.

[1] Machine Learning ZeroToAll, Mar 2018.

2015

[1] Polymorphic Virus VS AV Detection, Oct 2015.

2014

[1] Network Sniffing & Detection, Oct, 2014.