Abstract: Disclosed is a method for recovering magnesium from by-products generated in an electrolytic chlorine generation system. According to one aspect of the present disclosure, there is provided a method for recovering magnesium from by-products generated in an electrolytic chlorine generation system, the method including: receiving and drying the by-products in a preset first environment; and calcining the dried by-products in a preset second environment.

Abstract: An optical apparatus includes a lens including a first surface and a plurality of side surfaces, a display device disposed on a first side surface among the plurality of side surfaces of the lens and providing light to the first side surface of the lens, an optical path control device disposed between the first side surface of the lens and the display device and selectively changing an optical path of a virtual image of the display device, and a plurality of reflecting members disposed in the lens and reflecting light of the display device to the first surface.

Abstract: The present disclosure relates to a high energy density lithium secondary battery having significantly improved high-temperature storage characteristics and lifespan characteristics, which are problematic when a silicon-based negative electrode active material is applied. Specifically, a lithium secondary battery according to an exemplary embodiment includes a positive electrode; a negative electrode facing the positive electrode and including a silicon-based negative electrode active material; and a non-aqueous electrolyte containing a non-aqueous organic solvent including a di-fluoro-based organic solvent and a lithium salt, wherein a content of the di-fluoro-based organic solvent is 5 to 20 vol % with respect to a total volume of the non-aqueous organic solvent.

Abstract: A mobile terminal and method for controlling place recognition are provided. The method includes collecting at least one of state information about a mobile terminal and user information stored in the mobile terminal, determining whether a current place of the mobile terminal is a major place that the user has previously visited at least a number of times using the collected information, determining, if it is determined that the current place of the mobile terminal is a major place, whether the current place has been registered using at least one signal received externally, and outputting a result of the determination as to whether the current place has been registered.

Abstract: A mobile terminal and method for controlling place recognition are provided. The method includes collecting at least one of state information about a mobile terminal and user information stored in the mobile terminal, determining whether a current place of the mobile terminal is a major place that the user has previously visited at least a number of times using the collected information, determining, if it is determined that the current place of the mobile terminal is a major place, whether the current place has been registered using at least one signal received externally, and outputting a result of the determination as to whether the current place has been registered.