The book "Computer Applications for Security, Control and System Engineering" presents the refereed contributions from the International Conferences on Security Technology, Control and Automation, as well as Circuits, Communication, Electronics, and Systems Engineering, which took place in November/December 2012 on Jeju Island, Korea. The selected papers provide a comprehensive overview of the latest developments and research findings in these fields. The conferences attracted numerous experts who shared their insights and innovations regarding security technologies and their applications across various technical disciplines. The careful selection of contributions ensures that readers have access to high-quality and relevant information that covers both theoretical and practical aspects.