- Acoustic microscopy (1975-1992)
- Photoacoustics (1978-1981)
- Design of digital integrated-circuits (1985-1993)
- Design of analog integrated-circuits
- Microwave-integrated-circuit design (1989-1994)
- Computer-aided-design of VLSI circuits (1989-1996)
- Atomic force microscopy (1995-2005)