Experience

INTERPARK

• South Korea
• IT Services and IT Consulting
• 1 - 100 Employee

• Senior Research Engineer

  • May 2017 - Present

  Purchase/Churn prediction for CRM Marketing(AWS,pySparkML) User profile design and development for recommendation and management (Redash,Tableau,Prestos/hive) Personalized recommendation for ecommerce (AWS/EMR, Spark, Google Analytics, docker, git,airflow,ci/cd,jenkins) • Data analyse and preprocess to filter the unnecessary data on AWS • Recommendation using view/buy data based on popularity of each category • optimizing parameters for Spark job Shoppingmall log data analysis using Pandas/Spark • UV, PV, CTR, CR extraction and analysis Object Detection(Keras) -Train/analyse/release Model -Generate large scale train dataset -large scale Image data processing / cleansing/ management -asynchronized distributed system Visual search • Hand-crafted descriptor based recommendation • CNN based (Keras, Tensorflow) Korean text recognition(OCR) system development using neural networks (Python, mxnet, tensorflow) • Part I: Text detection - Image Processing based method (python, opencv) - Deep Learning based method • Part II: Text recognition, based on deep learning • Part III: Distributed System development for Text recognition platform Show less



Netmarble Games

• Indonesia
• Entertainment Providers
• 1 - 100 Employee

• Senior Research Engineer

  • Aug 2016 - Dec 2016

  - Game item recommendation system using game log data (Python/pyHive/pyMSSQL) • SVM/Random Forest/xGBoost/Decision Tree • Feature construction and extraction, automatic feature selection from game log data • Data visualization: boxplot, histogram, entropy/gini impurity extraction from features - Game action recommendation system development using DQN (python, tensorflow) - Game item recommendation system using game log data (Python/pyHive/pyMSSQL) • SVM/Random Forest/xGBoost/Decision Tree • Feature construction and extraction, automatic feature selection from game log data • Data visualization: boxplot, histogram, entropy/gini impurity extraction from features - Game action recommendation system development using DQN (python, tensorflow)



HydroNet

• United States
• Telecommunications

• Senior Research Engineer

  • Aug 2015 - Jul 2016

  Water leak detection using Deep learning System (Python) • Deep Learning Research: Regularization, Optimization, CNN, Audoencoder, MCMC • Bayesian, Likelihood Classification Research for water leak detection • Audio feature extraction from leak signal: MFCC, coherence, cepstrum,cross-correlation, bessel, hanning Water leak detection using Deep learning System (Python) • Deep Learning Research: Regularization, Optimization, CNN, Audoencoder, MCMC • Bayesian, Likelihood Classification Research for water leak detection • Audio feature extraction from leak signal: MFCC, coherence, cepstrum,cross-correlation, bessel, hanning



KSS-ImageNEXT Co.Ltd

• Appliances, Electrical, and Electronics Manufacturing
• 1 - 100 Employee

• ADAS system developer based on computer vision

  • Dec 2014 - Jul 2015

  - ADAS system development: • Development of Front Collision Warning System using AdaBoost. • Development of day/night classification • Development of Lens Dirt Detection • Development of Image Enhancement algorithm • Development of Image Quality Evaluation system • Autonomous Driving System design using LiDAR, Radar, StereoVision - ADAS system development: • Development of Front Collision Warning System using AdaBoost. • Development of day/night classification • Development of Lens Dirt Detection • Development of Image Enhancement algorithm • Development of Image Quality Evaluation system • Autonomous Driving System design using LiDAR, Radar, StereoVision



Verasys

• Information Services
• 1 - 100 Employee

• ADAS System Development based on computer vision

  • May 2013 - Sep 2014

  - Developed realtime FCW using disparity map from stereo camera and pattern recognition algorithm • Stixel generating algorithm ans clustering • Converted disparity map from stereo camera to 3D space • Developed image feature based vehicle detection for mono camera • Developed RANSAC and PCA algorithm, DBSCAN Clustering • feature extraction used and analysed: HOG, LBP, HAAR • Classifier used and analysed: Adaboost, Decision Tree, SVM, CART • Vehicle detection using disparity map and Adaboost Show less



Real D Square

• India
• Construction

• Computer Vision Algorithm Engineer

  • Jan 2010 - Mar 2013

  10/2011 – 03/2013 Development of 3D reconstruction system using structure from motion method • Epipolar Geometry: Fundamental Matrix, Essential Matrix, Triangulation algorithm • Camera parameter extraction using EXIF information for camera calibration • Point extraction & matching: SIFT, PCA-SIFT and SURF algorithm • Bundle Adjustment algorithm, Space Carving, Volumetric Carving, Delaunay triangulation • Noise remove using Moving Least Square Algorithm, Surface smoothing using Poisson Algorithm • Applied patent: an algorithm for detecting and correcting wrong directions of automatically generated surfaces using point cloud • Used PCL library, Open GL, 01/2010 – 10/2011 Developed depthmap extraction and editing tool for stereoscopic movie conversion in C/C++ • Depth map extraction from stereo image • Motion vector extraction using optical flow • Vanishing point detection using Hough transformation algorithm • Image Segmentation: Graph cut algorithm, Grab Cut algorithm, Alpha Matting algorithm, Mean Shift algorithm, Watershed algorithm, etc. • Morphing algorithm: Free-form deformation, Radial basis function, GPU Programming • System Programming, Undo/Redo function, Memory Management, Structured Exception Handling • Visual C++ and MATLAB mixed programming, C#, C++, Open CV, Open GL, GPGPU Programming etc. libraries • stereoscopic video player using DirectShow and MFC Show less



HQTech

• Software Development
• 1 - 100 Employee

• Junior Software Engineer

  • May 2009 - Dec 2009

  -Developed the automatic bug testing system for camcoder embedded system at Samsung Electronics -Developed the automatic bug testing system for camcoder embedded system at Samsung Electronics



Elektrobit Automotive GmbH

• Germany
• Software Development
• 1 - 100 Employee

• Junior Embedded Software Engineer

  • Sep 2006 - Jul 2007

  - Developed picture viewer on navigation system - Developed firmware update tool by server - Developed media player of set-top box bootloader on Windows CE - Developed picture viewer on navigation system - Developed firmware update tool by server - Developed media player of set-top box bootloader on Windows CE



TwonkyVision

• Germany
• IT Services and IT Consulting

• Junior Software Engineer

  • Mar 2006 - Aug 2006

  - Developed HTTP Server in C - Developed Bluetooth Gateway in C# - Developed UPnP server on Windows CE using Embedded Visual C++ - Developed HTTP Server in C - Developed Bluetooth Gateway in C# - Developed UPnP server on Windows CE using Embedded Visual C++