Doyun Gu
Final-year electrical and electronic engineering at the University of Manchester. Circuit design, embedded systems, and power electronics are what I actually spend the hours on, and simulation of power networks is the research that grew out of them. I write here about the companies building the hardware those networks run on. When a post takes a position, the position goes on the record the same day.
- 2022
University of Manchester
BEng Electrical and Electronic Engineering.
- 2024
Aston Martin, ADAS
Placement year. Designed a custom STM32F board bridging vehicle sensors for Adaptive Cruise Control and Lane Centring.
- 2025
Final year, dynamic phasors
Dynamic-phasor simulation of power networks with Dr Gus Zhang. The work became DPSpice.
- 2026
Building and publishing
DPSpice accepted at IEEE ECCE 2026. Writing here about the equipment layer underneath the build-out.
- Circuit design
- Schematic and PCB, switching converters, analogue sensing front-ends
- Embedded systems
- STM32 firmware, real-time acquisition, sensor fusion
- Power electronics
- Converter topologies, machine drives, inverter control
- Power systems
- Network simulation, dynamic phasors, transient analysis
How the record is kept
A call is a position, not an opinion. It carries a direction, an entry date, and an entry price, and it is written into the registry the day it is taken rather than reconstructed afterwards. Open calls are marked at the last close, so their number is provisional. Closed calls are marked at the exit and never re-marked, which means a realised loss stays a loss even when the ticker later recovers.
A losing position and a broken thesis are different failures. A position can lose money while the reasoning still holds, and a thesis can stop being true while the position is still in profit. Only the second one demands an exit on its own, and calls in that state are marked THESIS BROKEN and left on the record with their final return attached.
Nothing is deleted, backdated, or quietly dropped because it went badly. A record that keeps only its winners is not a record, and the losing calls are the only reason the winning ones mean anything. The whole book is at /stocks.
- me@doyungu.com
- GitHub
- github.com/doyungu
- DPSpice
- dpspice.com