Harry Liuhan

Why the first digit is often one

In some collections of measurements, the first significant digit is much more likely to be one…
A thousand design questions in one adjoint solve

A wing’s shape might be described by a thousand adjustable parameters. Improving the design requires knowing…
Winning every comparison and losing overall

Algorithm A beats algorithm B on easy images. It also beats B on difficult images. Surely…
A quieter wing might still have a lively wake

10th August 2026 Suppose a modified wing produces smaller fluctuations in its total lift. The immediate…
Why a nearly full system can become painfully slow

A server that is busy almost all the time looks efficient and positive for the owners,…
Why a scaled wing needs a different wind

10th June 2026 A miniature aircraft looks like its full-sized counterpart, but the air does not…
The mathematics of knowing when to stop looking

10th May 2026 Choosing is easy when every option can be compared at once. It becomes…
When a perfect ‘fit’ cannot identify the answer

10th April 2026 Imagine watching a mass bounce on a spring. If the mass and spring…
The frequency hiding between the measurements

March 10th 2026 A perfectly clean graph can describe the wrong motion. That is the unsettling…
How a robot decides which measurement to trust: the Kalman filter

10th February 2026 A small robot estimates that it has travelled ten metres along a corridor.…