About

I am an R&D Scientist at Oak Ridge National Laboratory (ORNL). Before joining ORNL, I worked at Pacific Northwest National Laboratory (PNNL), George Mason University, and Pusan National University as a Post Doctorate Researcher. I have working experience for six months in Geospatial Information Section at United Nations Global Service Centre (UNGSC) in Brindisi, Italy as a geospatial expert regarding Open Source Geospatial Software. Since then, I have contributed to UN Open GIS Initiative as a member. In 2013, I participated in the MediaQ project, which is designed and maintained by the Integrated Media Systems Center (IMSC) at the University of Southern California (USC), as an external collaborator.

I graduated in the Department of Computer Engineering from Pusan National University, South Korea with a Bachelor of Engineering, Master of Engineering, and Ph.D. of Engineering in Computer. My Ph.D. thesis was entitled 'Preserving Location Anonymity in Indoor Spaces.' The Ph.D. was carried out under the supervision of Prof. Ki-Joune Li.

My major research areas include spatial (spatiotemporal) databases, telematics, computational geometry, agent-based modeling, urban simulation, spatial analysis, location privacy, GIS, data modeling, and data mining. Results of my research have been published as papers and reports.

I have been involved in professional services in geoinformation and simulation communities. Currently, I am the general chair of GeoSim 2022, a program co-chair of SpatialEpi 2022, and a program committee member of ACM SIGSPATIAL 2022. I serve on the Editorial Board of Smart Technologies and Cities, specialty section of Frontiers in Sustainable Cities as a review editor. I served as a co-guest editor of the Special Issue: "Geo-Enriched Data Modeling & Mining", ISPRS International Journal of Geo-Information. I served the general chair of GeoSim 2021, the chair of the AIS (AI and Simulation) track of Spring Simulation Conference 2020, and the chair of the AIS (AI and Simulation) track of Annual Modeling and Simulation Conference 2021-2022, a program co-chair of GeoSim'18-'20, and a program committee member of GeoRich 2020, ACM SIGSPATIAL 2019, 2020 & 2021, SpatialEpi 2020 & 2021, WinterSim 2019 (Track: Big Data in Simulation), 2020 & 2021 (Track: Data Science for Simulation)

I have participated in various projects related to GIS including National Spatial Data Infrastructure (NSDI) projects, performing multiple roles. As a software developer, I started the first project to develop a moving object management system in road networks. It includes a moving object generator, simulator, and visualization tool in road networks. I deeply contributed to developing the 3DF-GML, national standards of 3D feature model and data specification based on Geographical Markup Language (GML), as a project manager. And from top to bottom, I have been involved more than 5 years in the R&D project that aims to develop an indoor data management system for indoor spatial awareness and indoor data models. Especially, I developed an alternative and efficient 3D geometry model, called Prism. Also, I have been participating in open source projects as a contributor. In particular, I have been developing modules of GeoTools: 3D geometry and complex feature. During the projects, I have designed overall architecture and DB schema, proposed efficient data models and algorithms, applied and obtained three patents, and implemented core modules and various applications. I have developed an geo-social simulation framework (funded by DARPA), and ensemble approaches to combine predictions from COVID-19 simulations and a dashboard to effectively visualize such predictions (funded by NSF).

I have worked as an expert on international standards related to GIS published by Open Geospatial Consortium (OGC) and ISO/TC211. I also joined an OGC Working Group for IndoorGML, which is an international standard for indoor navigation. You can check out my video lectures on ISO 19107 – Spatial Schema and GML in Korean.

I have strong programming skills. I am not only an expert of C, C++, and Objective-C but also very proficient in C#, Java and Python programming languages. I have taught multiple courses regarding programming including Introduction to GIS Programming and Algorithms, Introduction to Open Source Software Development, Java Programming, and Object-Oriented Programming. I have wide-ranging programming experiences related to GIS including databases, spatial DBMS (PostGIS, Oracle SDO), Web-based, 2D, 3D graphics, and mobile programming. I also have experiences to use and integrate geo-information tools/libraries such as QGIS, ArcGIS, GoogleEarth, GeoServer, GeoNode, GeoSHAPE, GeoTools, CGAL, and LEDA. I have developed simulation models using simulation framework/toolkits including MASON, GeoMASON, NetLogo, OpenSim, Mesa, NS3, HELICS, and GridLAB-D.

My industrial resume and academic CV (last updated October 21, 2021).

Also, you can find me at Google ScholarResearch Gate, LinkedIn, DBLP