## 3 Results and Discussion
### Patents Landscape
The former proposes a space usability testing laboratory comprising a test area for displaying a 3D model of the space based on immersive virtual reality, and the experience data of test users are collected during the test process [32]. The latter proposes a method for the usability testing of the space, which involves obtaining a 3D model of the space to be tested, and the test task is performed by a user wearing a virtual-reality-based wearable device [31]. According to the inventors, the advantages are that the user's understanding of the user experience may improve this experience, space usability testing is more convenient, and its results are more accurate. Furthermore, the manner of implementation could truly display the design appearance, the user experience is real, the test result is accurate, and the test consistency and efficiency are high. The US20210090343A1 patent [35] proposes a method for providing design reviews using virtual-reality devices, involving the processing of interactions of users in a virtual-reality format and the generation of output on the basis of users' actions. The advantage of the invention is that the method would make it possible to generate a complete design review cycle in an easy manner, so that time consumption could be reduced effectively. The inventors claim that the technology would open the door to a range of new applications that have not been possible until now and that the invention would revolutionize design reviews with a radically new experience using virtual reality. Multiple users might collaborate remotely and perform design reviews within the virtual reality environments. The US20190227626A1 patent [36] proposes a system for personalizing a human-machine interface (HMI) device based on the mental and physical state of a user. During the performance of a task in a simulation environment (such as training in virtual reality), the system extracts biometric features from data collected from body sensors and brain entropy features from electroencephalogram signals. Both data are correlated to generate a mental-state model. The mental-state model is deployed in a, HMI device during the performance of a task in an operational environment for the continuous adaptation of the HMI device to its user's mental and physical states. The advantage of the invention would be that the continuous adaptation of the HMI to the mental and physical states of the user would reduce the workload and enhance decision-making. The need for unnecessary modifications in the interfaces would be eliminated, and the designs would be more user-centered and customized to the real needs of users. Finally, the KR20190088710A patent [37] proposes a method for assessing the usability of automotive infotainment systems that comprises facilitating interactions between numerous virtual infotainment systems and drivers in a virtual driving environment while investigating the usability of vehicle infotainment systems. The usefulness of a virtual infotainment system is determined by evaluating both the execution time of the operation command and the running condition of a virtual car as a result of the execution of the operation command. The virtual car's running state contains the virtual vehicle's speed, its distance from the preceding vehicle, the distance between the lane and the virtual vehicle, and the steering angle during the execution of a drive operating instruction. The novelty of the invention is its evaluation of the cognitive load of a driver by using the vehicle infotainment system and its use of the driving state of a virtual vehicle in accordance with the performance time of the operation command and the performance of the operation command to evaluate usability for each of virtual infotainment system.