Abstract: A kitchen hood has a first housing and a second housing that slides into and out of the first housing to adjust a length of the kitchen hood. The first housing has a fan to suction air, an outlet, and an air quality sensor assembly to continuously detect air quality in a kitchen. The second housing has an inlet and suction grill through which air is suctioned, a steam cleaning assembly to automatically steam clean an interior of the kitchen hood, and a height sensing assembly to sense a height of cookware seated on a cooktop surface below the second housing. The kitchen hood may be lengthened or shortened based on the sensed height of the cookware, and a speed of the fan and the height of the kitchen hood may be automatically adjusted based on detections by the air quality sensor assembly.

Abstract: An air conditioner includes a purifying unit having at least one filter; a sensor unit including an air quality sensor; and a controller configured to: calculate a filter contamination level based on (i) data regarding indoor air quality measured by the air quality sensor during an operation of the air conditioner, and (ii) an operating time of the air conditioner; combine the calculated filter contamination level with a pre-stored filter contamination level to obtain a combined filter contamination level; and based on the combined filter contamination level satisfying at least one filter replacement condition, output filter replacement indicator information.

Abstract: An air conditioner includes a purifying unit having at least one filter; a sensor unit including an air quality sensor; and a controller configured to: calculate a filter contamination level based on (i) data regarding indoor air quality measured by the air quality sensor during an operation of the air conditioner, and (ii) an operating time of the air conditioner; combine the calculated filter contamination level with a pre-stored filter contamination level to obtain a combined filter contamination level; and based on the combined filter contamination level satisfying at least one filter replacement condition, output filter replacement indicator information.

Abstract: A mobile terminal including a display unit arranged on the front surface so multiple pieces of visual information corresponding to multiple layers, respectively; and a front-surface input unit so a control command is input into the front-surface input unit and a rear input unit arranged on the rear surface so the control command is input into the rear input unit; and a controller to apply a function corresponding to an input to first visual information displayed on a first layer, and activate a second layer arranged under the first layer while maintaining a state in which the first visual information is displayed on the first layer in response to input to the rear input unit.

Abstract: A mobile terminal including a display unit arranged on the front surface so multiple pieces of visual information corresponding to multiple layers, respectively; and a front-surface input unit so a control command is input into the front-surface input unit and a rear input unit arranged on the rear surface so the control command is input into the rear input unit; and a controller to apply a function corresponding to an input to first visual information displayed on a first layer, and activate a second layer arranged under the first layer while maintaining a state in which the first visual information is displayed on the first layer in response to input to the rear input unit.