A Busan-based multidisciplinary engineering firm ((주)이정이앤씨, founded 1978) with a dedicated Disaster-Prevention Division (방재사업본부) alongside building, electrical and telecom design and supervision arms. The fire division performs fire performance-based design (소방성능위주설계) using fire and evacuation simulation, plus pre-disaster impact reviews and disaster-mitigation planning for complex and high-rise buildings.