Curiosity is the fundamental driving force of all my research. Based on empirical data, I am trying to understand the underlying mechanism of everything, from cosmos to humans. My research covers the following main topics and you can navigate to the details by clicking the hyperlinks.Â
Item Response Theory, Classical Testing Theory, Test Design
Evidence Centered Design (design games/simulations for assessment purpose)
Data Mining and Analytics in Game/Simulation-Based Assessment
Assessment of Collaborative Problem Solving and Teamwork
Data Model Design for Log files from G/SBAs
Development of Tools for Assessment Analytics
Natural Language Processing
Automated scoring/annotation, Sequential annotation
Text mining, Sentiment Analysis
Keystroke analysis for essay writing
Data mining/Statistical analysis/scientific computing
Machine learning algorithms, cluster analysis, Mixture Model, Hidden Markov Model, State Space Model
Linear/Nonlinear regression, Logistic Regression, Generalized Linear Regression, Bayesian Regression
Sequential Data Analysis/Time Series, Dynamical Linear Modeling, Dynamical Bayesian Network
Stochastic Process, Random Field, Markov Chain Monte Carlo, Monte Carlo Simulation, Gaussian Process Regression
Statistical/Mathematical Modeling, Model estimation
Digital image device & image analysis
CCD (charge coupling device) testing/calibration
Astronomical image segmentation, registration, pattern recognition
Image quality and point spread function measurement
Image based precision measurement
Theoretical physics/Astrophysics/Cosmology
Cosmology, Dark energy dynamics
Galaxy cluster identification, cluster cosmology, galaxy alignment
Non-topological soliton
Quasi-normal mode of stringy black hole
Dynamical system and differential equations