1993- ● Designed and manufactured automated mail handling and processing equipment for Ministry of Postal Services. ● Designed and developed plain paper fax machine. ● Designed and manufactured X-Y-Z Robot , an automated central office system for switching telephone circuit numbers. ● Designed and manufactured Optical Character Reader (OCR) checker for high-speed check processing machines. ● Designed and manufactured laboratory equipment. ● Project managed MSW incinerator technology transfer (Japan to Korea) and new technology assessment and transfer (US to Japan).

1992-1983 ● Designed consumer electronics products and supplied components to a major Taiwan manufacturing company. ● Coordinated the construction of a hydroelectric station in Malaysia. ● Provided engineering consulting to electric motor manufacturing companies in Brazil. ● Designed:　 - The Casio liquid crystal printer - The Ricoh copying machine - The Panasonic fax machine - The Hitachi plain paper copying machine - Telephone switchboards - and manufactured control instruments for factory automation

1982-1973 ● Designed consumer electronics products and supplied components to a Singapore manufacturing company. ● Designed:　 - Wireless control center for the NPA agency (National Police). - Satellite communications equipment including antenna for land stations, control systems transmitter-receivers, and related devices. - Meteorological radar. - Missile guidance system. - and manufactured high-frequency measuring device. - and manufactured X-Y plotter.

1972-1962 ● Designed consumer electronics products and supplied components to a Singapore manufacturing company. ● Designed:　 - Electric field strength meter for Radio Wave Research Institute. - Radar and ITV camera, for South Pole Observation boat. - Studio-use TV camera VTR, and broadcasting facility for NHK. - Experimental facility for broadcast satellite and manufactured sensors for the South Pole Rocket.