Abstract: An electronic device for measuring water quality of inflow sewage, the electronic device comprising: a sensor part installed inside a pipeline of the inflow sewage and including at least one sensor for measuring a water quality item of the inflow sewage and outputting a sensing value; a communication part for communicating with a server; and a controller for processing and transmitting the sensing value to the server, wherein the sensor part further includes a pollution prevention part for emitting a fluid toward an electrode part of the sensor, and wherein the controller controls the pollution prevention part to emit the fluid at a first predetermined period.

Abstract: The present invention relates to a method and system for selling and buying items at auction using information about the purchase of items via an online shopping mall website. In order to sell and buy used items, a used item seller does not need to separately provide pieces of information about used items, and can perform a transaction for the used item using only a minimum number of inputs or actions, thus saving temporal and material costs caused by the disposal of used items. As a result, the present invention can offer convenience to the sellers of used items and can allow the buyers of used items to reasonably fix the states or prices of their desired used items and purchase relevant used items.

Abstract: A repeater for relaying data signals between two nodes is provided. The repeater includes a first signal processor that amplifies the received data signals, a path controller that transmits initial information of the received data signal through a first path to determine if the received data signal is from a specific local area and transmits data signals following the initial information through a second path to amplify the data signals following the initial information, a second signal processor that amplifies and transmits the data signal, and a data selection processor that allows the data signals following the initial information to be transmitted through the second path when it is determined using the initial information received that the received data signal is from the specific local area.

Abstract: A backlight unit includes a lamp to generate and radiate an ultraviolet ray, a light guide plate including a light receiving portion to receive the ultraviolet ray, an optical sheet disposed on the light guide plate to change the ultraviolet ray into a visible ray, the optical sheet including a fluorescent material, and a reflective sheet arranged under the light guide plate.

Abstract: A backlight unit and a liquid crystal display having the backlight are provided. The backlight unit includes a plurality of light emitting diode (LED) chips, a light guide plate for converting light generated from the LED chips into surface light, and a plurality of optical guide modules corresponding to the respective LED chips and disposed between the LED chips and the light guide plate.

Abstract: A repeater for relaying data signals between two nodes is provided. The repeater includes a first signal processor that amplifies the received data signals, a path controller that transmits initial information of the received data signal through a first path to determine if the received data signal is from a specific local area and transmits data signals following the initial information through a second path to amplify the data signals following the initial information, a second signal processor that amplifies and transmits the data signal, and a data selection processor that allows the data signals following the initial information to be transmitted through the second path when it is determined using the initial information received that the received data signal is from the specific local area.

Abstract: A backlight unit includes a lamp to generate and radiate an ultraviolet ray, a light guide plate including a light receiving portion to receive the ultraviolet ray, an optical sheet disposed on the light guide plate to change the ultraviolet ray into a visible ray, the optical sheet including a fluorescent material, and a reflective sheet arranged under the light guide plate.

Abstract: A backlight unit and a liquid crystal display having the backlight are provided. The backlight unit includes a plurality of light emitting diode (LED) chips, a light guide plate for converting light generated from the LED chips into surface light, and a plurality of optical guide modules corresponding to the respective LED chips and disposed between the LED chips and the light guide plate.