Knowledge On. The Company's principal activity is the manufacture of diodes, transistors, and semi-conductor devices. It also supplies infrared LED chips, and GaAs Schottky Rectifiers, and provides InGaP HBT foundry services. Foundry services include Multi-Project Wafer (MPW), Regular Shuttle Run (RSR), Prototype Wafer Run (PWR) and Pre-Production Run (PPR). The Company's trademarks include 'Optel', 'PowerRect', and 'Knowledge*on'. It operates mainly in South Korea. I red chip accounted for 62% of 2001 revenues; diode, 22% and led chip, 16%