Abstract: Provided is a polyethylene film having a multi-layer structure including an outer layer (A) including a first ethylene polymer having a density M1 of 0.935?M1?0.968; an intermediate layer (B) including a second ethylene polymer having a density M2 of 0.900?M2?0.920; and an inner layer (C) including a third ethylene polymer having a density M3 of 0.850?M3?0.905, wherein the outer layer (A), the intermediate layer (B), and the inner layer (C) are sequentially laminated to form the polyethylene film comprising the multi-layer structure, and wherein a falling ball impact strength per unit thickness and a puncture strength per unit thickness of the polyethylene film comprising the multi-layer structure are 3.0 to 15.0 g/?m and 0.2 to 0.4 N/?m, respectively, and a difference in melting point between the outer layer (A) and the inner layer (C) is 30 to 100° C.

Abstract: A robot includes a main body provided with a driving wheel, a neck body extending upward from a front portion of the main body, a head including a display body in which a display is provided, and a protrusion protruding from the display body and inserted into the neck body, a tilting mechanism for tilting the head, and a support frame disposed inside the neck body and supporting the tilting mechanism. The tilting mechanism includes a coupling body coupled to the protrusion, a supporter for supporting the coupling body and coupled to the support frame, and a motor for rotating the coupling body.

Abstract: A robot includes a mobile robot provided with driving wheels, a frame provided in the mobile robot, a housing having an opening formed therein, a drawer guide having a fixed bracket installed in the housing and a moving bracket moving along the fixed bracket and drawable out through the opening, and a drawer mounted on the moving bracket to be inserted into the housing or drawn out of the housing.

Abstract: A robot includes a main body provided with a driving wheel, a neck body extending upward from a front portion of the main body, a head including a display body in which a display is provided, and a protrusion protruding from the display body and inserted into the neck body, a tilting mechanism for tilting the head, and a support frame disposed inside the neck body and supporting the tilting mechanism. The tilting mechanism includes a coupling body coupled to the protrusion, a supporter for supporting the coupling body and coupled to the support frame, and a motor for rotating the coupling body.

Abstract: A robot includes a mobile robot provided with driving wheels, a frame provided in the mobile robot, a housing having an opening formed therein, a drawer guide having a fixed bracket installed in the housing and a moving bracket moving along the fixed bracket and drawable out through the opening, and a drawer mounted on the moving bracket to be inserted into the housing or drawn out of the housing.