About

Electrical engineer. PhD from Korea University. I design sensor hardware, write the firmware that runs on it, and build the test systems that prove it works. Sometimes I also write software, usually because no one else will.

My PhD work was CubeSat payload hardware. Electrochemical and optical sensor arrays for small satellites. I did the full stack on that -- schematic capture, PCB layout, board bring-up, firmware, calibration, environmental testing. Managed a $220K research budget. Published in IEEE TIE, MDPI Sensors, and Bioelectrochemistry. Three first-author papers.

After that, Hanwha Systems. Systems Integration Engineer on military SAR satellite programs. Integration and test across EM, QM, and FM model builds. I designed EGSE setups, wrote IST procedures, and spent a lot of time debugging interface failures between subsystems that were each working fine on their own. That is where most satellite problems live.

Now I am a Postdoc at UMass Lowell. The work is pharmaceutical process modeling -- digital twins and real-time quality monitoring for manufacturing lines. I built a Python suite that replaced a commercial platform for mRNA-LNP vaccine process development. It is a different domain, but the core problem is the same: measure something, model it, control it.

Engineering Philosophy

If it has not been tested, it does not work. A schematic is a hypothesis. A prototype is an experiment. The test report is what actually matters. I do not trust simulations I cannot validate, and I do not ship things I cannot debug at 2 AM.