## 2 Related Works
### AR-Based Smart Monitoring Service  
Augmented reality (AR) technologies are the next generation computing platform technologies and are destructive technologies that can significantly change the existing ICT market and create new markets. Augmented reality technology is still growing/evolving to the stage of growth, and efforts to create a profit model based on second- and third-generation products continue. The AR technology field is a core technology field that can innovate the ICT market in the future [18]. In relation to the proposed system, some companies in South Korea have also built a disaster response system. First of all, in order to identify occupants' location and implement the safety management service using the location information, it is essential to analyze and simulate data using virtual reality (VR)/augmented reality (AR) and IoT based on complex environmental information.  
Samsung C&T Corporation is in operation of the \"4D Experience on Falling Safety\" education where workers experience actual 3D virtual images of workplaces, and recognize the risk factors. Virtual reality machines are used to vicariously experience construction site crashes. In South Korea, firefighting schools implement simulations in the same way as actual emergency situations. Currently, domestic disaster management systems through AR technology is mainly an education method and experience-oriented technology for prevention [19].  
In our system, it is crucial to recognize the position of the occupant and related technologies include beacons, detection sensors (ultrasonic, motion detection, etc.) and detection using radio signal strength. Cornerstones Technology Corp. developed an IoT-based fire evacuation system that guides the escape route optimized for each situation to the evacucee by voice or direction using lighting device in 2016. Korea Telecom (KT) Corp. developed MOS (Monitoring, Maintenance and Management Operation System). This service monitors the temperature, humidity, leaks, fire, etc. of the facilities of buildings, factories, railways, and airports. Based on IoT sensors, this service monitors and controls 24 h at the central control center. Firepro Corp. developed a distributed temperature sensing system that monitors the temperature changes within a cable and monitors the occurrence of the fire early on and minimizes the damage. Hansori Corp. is supplying intelligent fire signs detection system. This intelligent system detects fire signs such as abnormal temperature rising before power outage in various electric power equipment and sends this information to the manager. Smart Technology Corp. developed intelligent video-based fire detection system. This system analyzes video signal inputted from closed-circuit television (CCTV) camera. It is possible to detect fire, smoke, auto detect, and set an alarm. BOSCH Security Corp. developed and commercialized intelligent image analysis technology that can detect objects. This technology can detect intrusion and explosive objects in airports, railroad stations, power plants, and so on. There are several disaster-aware and IoT-based disaster management systems. However, systems that aid rapid rescue and provide simulation and guidance for evacuation are few in number. Additionally, there is no remote system based on IoT that can cooperate with the actual fire department to quicken response. The proposed system in this paper can allow safer rescues by providing guidance to occupants in the case of an actual fire. Augmented reality technology is applied for rapid rescue, evacuation simulation, and guidance. Also, this IoT-based remote system provides real-time fire occurrence information, and can allow for quick cooperation with the fire department. Table 3 shows differences of the proposed system compared with the existing system.