Daewoo Engineering & Construction Co Ltd (Daewoo E&C) is involved in civil engineering projects, housing construction, plant construction, and other businesses. Its business portfolio includes civil engineering projects such as roads, bridges, ports, railways, subways, water resources, and renewable energy. In housing construction, it focuses on apartments, residential-commercial complexes, officetels, and non-residential facilities such as commercial facilities, offices, and data centers. Daewoo E&C is also involved in domestic and international investment development, real estate leasing, and hotel business. The company operates in industries such as infrastructure development, residential and commercial construction, oil and gas facilities, power plants, and industrial equipment. The company's key projects include the Dorimcheon Deep Rainwater Drainage Tunnel, Jinhae New Port dredged soil dumping site, and the Mumbai Sea Bridge. The company serves both domestic and international markets, with a focus on Southeast Asia and the Middle East.

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Daewoo E&C has undertaken various R&D initiatives aimed at advancing technology in construction and engineering. These initiatives include the development of smart construction technologies, digital-based road construction equipment automation, and innovative design technologies for ultra-large floating offshore wind power infrastructure. The company is also focused on improving the performance of construction methods and materials, such as optimizing sound insulation in PC-structured apartment buildings and enhancing offshore DCM performance for large-scale landfill projects. Additionally, Daewoo E&C is working on modernizing sewage treatment plants and developing high-temperature gas furnaces for industrial process heat. The R&D units of the company include the Technology Strategy Team, Smart Construction Research Team, Housing Construction Technology Team, Housing Construction Machinery Equipment Team, Housing Construction Electrical and Communications Team, Housing Construction Research Team, Housing Construction BIM Team, Civil Engineering Domestic Technology Team, Civil Engineering Overseas Technology Team, Civil Engineering Research Team, Plant Business Division teams, and the Plant Research Team. The Technology Strategy Team is responsible for the general planning and operation management of the Technology Research Institute, including technology planning, strategy establishment and implementation, technology support advancement, business performance management, risk management, and intellectual property rights management. In FY2024, the company spent KRW83.0 billion on R&D, which as a percentage of revenue stood at 0.8%.