Harland Harrison

A printed circuit board (PCB), sheet metal design, and manufacturing package for macOS.

I designed and coded the PCB design apps, including layout, design rule checking, auto-routing, and export for manufacturing. The code accepted schematic design formats from a variety of systems but integrated tightly with a co-marketed macOS tool and a SPICE package. Any manufacturer could use the standard Gerber output, but the apps are integrated well with the factory.

Broca's area is usually located in the cerebral hemisphere associated with the dominant hand. While about 10% of humans are left-handed, other animals with limb preferences exhibit a near-equal left-to-right ratio. At birth, the two brain hemispheres appear identical, and the mechanisms underlying hemispheric dominance remain unclear.

This simulation tests the hypothesis that hemispheric dominance is mainly developmental, with the widespread right-handedness resulting from the amplification of an initial, subtle bias. Although the corpus callosum connects the hemispheres, its long fibers transmit information slowly, suggesting that learned skills may concentrate in one hemisphere.

The simulation analyzes texts to extract vocabulary, randomly assigning new words to one hemisphere or another. When a sequence of three known words is encountered, with the middle word in the opposite hemisphere of the outer two, it is randomly reassigned. The results show that most words tend to concentrate in one hemisphere after processing approximately one million words—the number of words an infant typically hears in their first year. When a slight bias is introduced toward one hemisphere, most runs, though not all, favor the side with the bias.

Served as an iOS developer and wrote the Chiro iOS application, which emulates a physical device called the ThermoGraph, a temperature chart machine for chiropractors. My iOS app, Chiro, reads serial data transmitted from an Arduino device, processes the data, and displays a simulated live paper strip chart. It also edits and exports ID information. As a result, a bulky, custom, physical hardware device has been entirely replaced by the phone the doctor already has.