Whenever we see the development of technology of the past, the respective ages always Produced the development of new materials. The appearance of the new materials have been making technologies progress. In this way, we may say new materials and new technology are insparably related to each other. The technology of today has emerged between a valley of new technology of today and it is regarded as contributing to various technologies expected to be executed in the 21 century. Presently, so railed new materials mean fine cermic, high performance organic polymer, new metal materials, compound materials etc. This paper presents several new materials which are chiefly concerned with the electrical and telecommunications engineerings field and its development in Korea.

This paper presents a n analysis of the output voltage waveforms of the double sinusoidal modulated PWM inverter, and are studied on the driving characteristics through the 3 phase induction motor using 6502 microcomputer. The double sinusoidal modulated waves are produced during the interval 4$\pi$/3 [rad] for one cycle, and the switching loss can be reduced. The amplitude of fundamental wave of double sinusoidal modulated PWM inverter is 1.15 times higher than that of the sinusoidal PWM inverter, but the practical measured value by FFT analyzer is 1.13 times.