Mengmeng Liu Email & Phone Number

New York, United States

New York, United States

Baltimore, Maryland, United States

EN.553.636 Introduction to Data Science

Baltimore, Maryland, United States

EN.553.636 Introduction to Data Science (Graduate)

Shenzhen, Guangdong, China

• Developed and refactored auto data cleaning pipeline for O2O e-commerce project using Python and Impala SQL, increased data and pipeline reuse rate by 30%; Conduct O2O data asset project sharing meeting• Researched and trained unsupervised item image classification model by Pytorch with accuracy around 75%; Deployed through designing Restful API by Flask, Gunicorn and docker, reduced repeated image cleaning and labeling process by 80%• Created piecewise linear regression model to fit vague sale on Taobao platform, considered inventory and comment counts as model inputs, reduced MSE by around 67%• Analyzed evaluation of data asset quality, put forward key indexes and implemented in commercial quotation sheet, saved 70% communication time with clients, made an open presentation

Shenzhen, Guangdong, China

• Led clinical experiments in collecting biological signals (PPG, ECG and EDA) with professional devices; Built and managed reusable experiments dataset for 6 months; Provided data support for other engineers• Analyzed and cleaned experiment data. Filtered and restored signal waveforms with Butterworth, chebyshev2 in Scipy; Extracted features with peak detection algorithms; Wrote reports on abnormal biological behavior

Dongguan, Guangdong, China

• Conduct research on feasibility to implement time-frequency transformation algorithm in audio DSP with Matlab; Created simple GUI for other engineers to assess algorithm• Designed and deployed auto limiter in audio systems; Worked with hardware engineers and added feature to professional audio processor software• Fine-tuned parameters for audio algorithms with math derivation, raised performance by 20%

M.S.E, Data Science

Bachelor'S Degree, Mathematics, 3.7