In the field of stators including divided tooth-shaped iron cores and core back iron cores, a stator is provided in which the tooth-shaped iron cores and the core back iron cores can be easily connected to each other, and the tooth-shaped iron cores and the core back iron cores can be prevented from coming off in the radial direction. In one embodiment, a plurality of first target instructions is translated into a plurality of first host instructions. The user-worn device 10a sends the first information segment and the user device 20a combines the second information segment stored in its storage with the received first information segment, forming a third piece of information. If a match is not found, then the present invention may provide additional prompts to request additional information or test data such that the signature of computer system being tested can be further refined so that the signature of the target computer system might more closely match a reference signature. Methods of preparation, pharmaceutical compositions comprising said derivatives and their medical uses are also encompassed by this invention. The method may further include taking corrective action to reduce the glare in subsequent images based on which of the light sources are responsible for the glare.