Security manager. Safety participation manager (SEM) is the person who is responsible for coordinating and managing safety projects, teams or cooperative relationships. Responsible for project planning, budget and resource allocation. Security is an action to maintain social stability and people's safety. Including the protection of national security, economic security and social stability by the government and relevant institutions. It also includes some measures taken by enterprises or individuals to protect their own property and safety. Security plays an important role in some specific fields.