Research Areas

Tree of Codes

The first mass-produced book to deviate from a rectilinear format, at least in the United States, is thought to be this 1863 edition of Red Riding Hood, cut into the shape of the protagonist herself with the troublesome wolf curled at her feet. Produced by the Boston-based publisher Louis Prang, this is the first in their “Doll Series”, a set of five “die-cut” books, known also as shape books — the other titles being Robinson Crusoe, Goody Two-Shoes (also written by Red Riding Hood author Lydia Very), Cinderella, and King Winter.

Modular Multilevel Converters

Cascaded H-bridge (CHB) based electric vehicle chargers are widely recognized for their modularity, scalability, and robust fault-tolerant capability. Such converters are often modulated using level-shifted carrier-based PWM (LSPWM) schemes due to computational simplicity and ease of implemen- tation, but results in significant power imbalance among the modules. This power imbalance can be mitigated by reassigning carriers to modules, called Carrier-Reassignment PWM (CR- PWM). A First-In-First-Out (FIFO) based CRPWM is very easy to implement and provides some improvement over LSPWM, but fails to achieve perfect power balance. This paper proposes a novel carrier-reassignment scheme specifically designed for a 17-level CHB stage...