According to the news item, what are robots supposed to do in the trial?

(8)Robot wardens are about to join the ranks of South Korea’s prison service. A jail in the eastern city of Pohang plans to run a month-long trial with three of the automatons in March. The machines will monitor inmates for abnormal behaviour. Researchers say they will help reduce the workload for other guards. South Korea aims to be a world leader in robotics. Business leaders believe the field has the potential to become a major export industry.
     (9)The one-month trial will cost lbn won and is being sponsored by the South Korean government. It is the latest in a series of investments made by the state to develop its robotics industry. The country’s Ministry of Knowledge Economy said in January that it had spent the equivalent of ￡415 m on research in the sector between 2002 and 2010. It said the aim was to compete with other countries, such as Japan, which are also exploring the industry’s potential.