Abstract: A device for providing a location-based automatic participation chat room, the device, when a request to open a chat room is received along with service location information from at least one host terminal, creates at least one chat room, and sets a chat room identifier and a recognition code corresponding to each of the at least one chat room, and when at least one guest terminal accesses a location corresponding to the service location information using a pre-set participation means or the recognition code included in the participation means is received, makes the guest terminal participate in the chat room corresponding to the recognition code.

Abstract: A device for providing a location-based automatic participation chat room, the device, when a request to open a chat room is received along with service location information from at least one host terminal, creates at least one chat room, and sets a chat room identifier and a recognition code corresponding to each of the at least one chat room, and when at least one guest terminal accesses a location corresponding to the service location information using a pre-set participation means or the recognition code included in the participation means is received, makes the guest terminal participate in the chat room corresponding to the recognition code.

Abstract: A ventilating apparatus is disclosed, by which an installation of the apparatus is conveniently facilitated. The present invention includes a blower device supplying an outdoor air to an indoor space and discharging an indoor air to an outdoor space, a heat exchange unit performing heat exchange between the outdoor air supplied to the indoor space and the indoor air discharged to the outdoor space, and a case having a first chamber receiving the heat exchange unit therein and a second chamber receiving the blower device therein to communicate with the first chamber.

Abstract: Ventilating system including a total heat exchanger at a region where an air supply duct, a passage for supplying outdoor air to a room, and an air discharge duct, a passage for discharging room air to an outside of the room, cross for making room air and outdoor air to heat exchange, an air supply fan connected to the air supply duct for drawing the outdoor air and discharging the outdoor air to the room, an air discharge fan connected to the air discharge duct for drawing the room air and discharging the room air to an outside of the room, and a flow guide between the air supply/discharge fans and the total heat exchanger for guiding flow directions of the room air and the outdoor air, thereby reducing a flow resistance and making the heat exchange efficient.

Abstract: The present invention relates to ventilating systems, and more particularly, to a ventilating system having a heat exchanger for exchanging heat of room air being discharged to an outside of a room with heat of outdoor air supplied to the room. The present invention provides a ventilating system including a case having a first flow passage for guiding outdoor air to a room, and a second flow passage for guiding room air to an outside of the room, and a fan unit in the case, the fan unit having a first side for drawing the outdoor air from the first flow passage, a second side for drawing the room air, and a circumferential side for discharging the outdoor air drawn through the first side to the room, and discharging the room air drawn through the second side to an outside of the room.

Abstract: Ventilating system including a case in communication with a room and an outside of the room, an air supply fan unit secured to the case, the air supply fan unit having a plurality of fans for introducing outdoor air into the room, an air discharge fan unit secured to the case, the air discharge fan unit having a plurality of fans for discharging room air to an outside of the room, and a preheat exchanger in the case opposite to the air supply fan unit and the air discharge fan unit, for making the outdoor air and the room air to heat exchange with each other, thereby providing a compact ventilating system.

Abstract: In a plasma display panel, a space between a pair of sustain electrodes of a non-valid screen is different from a space between a pair of sustain electrodes of a valid screen. Accordingly, when discharges occur, impurities present inside the plasma display panel can be attached on the sustain electrodes of the non-valid screen, and thus, occurrence of an erroneous discharge at the valid screen can be prevented.

Abstract: A refrigerator and a method for controlling the same. The refrigerator having at least one storage chamber includes a food container for containing food; an RF tag attached to the food container for sensing a temperature of the food; an RF reader for reading data regarding the temperature of the food from the RF tag; and a controller for controlling an internal temperature of the storage chamber such that the temperature of the food read by the RF reader reaches a predetermined temperature. The refrigerator receives data regarding the temperature of the food by a non-contact manner, thus more precisely detecting the temperature of the food and storing the food in a fresh state for a long time compared to a conventional refrigerator.

Abstract: There is provided an air conditioning system and method for operating an air conditioner according to a user's physical response to external conditions. The air conditioning system includes: an indoor environment sensing unit/a personal characteristic value reception unit for measuring an indoor environment and the user's physical status so as to obtain information used to operate an air conditioner; a control unit including at least a microprocessor, for finding out personal characteristic values which are used to evaluate the user's physical status on the basis of information inputted from the personal characteristic value reception unit; and a driving unit controlled by the control unit, for promptly enhancing the user's physical status.

Abstract: The present invention relates to a plasma display apparatus. A plasma display apparatus according to the present invention comprises a plasma display panel comprising a scan electrode and a sustain electrode, a scan driver for applying a negative voltage to the scan electrode before a reset period when the scan electrode is applied with a positive voltage and a sustain driver for applying a positive voltage to the sustain electrode while the scan electrode is applied with a negative voltage.

Abstract: The present invention relates to a plasma display apparatus and a driving method thereof in which an erroneous discharge, a misdischarge and an abnormal discharge are prevented, a darkroom contrast is increased, an operation margin is widen, and an influence of a lower substrate wall charge is reduced in a sustain discharge. The plasma display apparatus and its driving method is characterized in that when the plasma display panel has a second temperature higher than a first temperature, a period between the last sustain pulse generated during a sustain period of (n?1)th sub-field (“n” is a positive integer) and an initialization signal generated during a reset period of nth sub-field is more lengthened than when it has the first temperature. The plasma display apparatus and its driving method is characterized in that a pre sustain pulse (PRESUSP) rising from a sustain bias voltage (Vzb) is applied to the second electrode in the sustain period.

Abstract: A plasma display apparatus comprises a plurality of upper electrodes formed on an upper substrate, a plurality of lower electrodes formed on a lower substrate facing the upper substrate and crossing the upper electrodes, and barrier ribs separating a plurality of discharge cells formed between the upper and lower substrates. The discharge cell is formed such that a horizontal width of at least one of an upper or lower portion thereof is smaller than that of a central portion thereof.

Abstract: Disclosed is a compact ventilating system, in which a heat exchange is carried out between the indoor air being exhausted to the outside of a room and the outdoor air being supplied to the inside of the room. The ventilating system includes a case fluid-communicated with the inside of a room and the outside of the room. An air-supply fan unit is secured to the case and introduces the outside air into the inside of the room. An air-exhaust fan unit is secured to the case and exhausts the indoor air to the outside of the room. A pre-heat exchanger is provided inside the case so as to face the air-supply fan unit and the air-exhaust fan unit. The pre-heat exchanger carries out a heat exchange between the indoor air and the outdoor air.

Abstract: A built-in ventilator mountable on a wall of a building includes an interior panel provided on an interior wall surface, the interior panel being provided with an interior air intake portion through which interior air flows in and an interior air supply portion through which exterior air is introduced into an interior space, an exterior panel provided on an exterior wall surface, the exterior panel being provided with an exterior air intake portion through which exterior air flows in and an exterior air exhaust portion through which interior air is exhausted to an exterior space, a partition disposed between the interior and exterior panels to separate the exterior air from the interior air, a fan unit for forcedly generating an air current for ventilation, and a regeneration heat exchanger for minimizing heat loss by heat-exchanging the interior air with the exterior air.

Abstract: Method for controlling an air purifier by using biorhythm including a first step of calculating total number of days (Delta_Time) a person in a room has lived by using the present year/month/date provided thereto or known through an inner counter, and birth year/month/date of the person in the room provided thereto, a second step of representing a physical rhythm state P_state, an esthetic state E_state, and an intellectual state I_state of the person in the room with the Delta_Time, numerically, a third step of setting a physical weight P-weight, an esthetic weight E, and an intellectual weight in correspondence to the P_state, E_state, and I_state, and a fourth step of controlling operation of the air purifier taking at least one of the P_weight, E_weight, and I_weight into account, whereby operating the purifier according to the biorhythm of the person in the room.

Abstract: Ventilating and air purifying device including a case having a blower therein provided to a ceiling or a wall, a first flow passage provided between the blower and a room for making an outdoor, the blower, and the room in communication, a second flow passage for making the room, an inside of the case, and the outdoor in communication, and a damper in the case for isolating the first flow passage from the second flow passage so that room air is discharged to the outdoor and the room air is guided to the blower, or making the first flow passage and the second flow passage in communication so that the room air introduced into the second flow passage is guided to the blower, thereby ventilating and purifying the room air.

Abstract: Disclosed is a combination air purifier and ventilator. The air purifier in accordance with the present invention includes a case being provided on a ceiling or a wall and having a fan therein, a first passage communicating with an outside, an inside of the case and an room, having an air purifying member being provided between the inside of the case and the room, and guiding the external air into the room, a second passage communicating with the room, the fan, and the outside, and guiding the room air to the outside, and a damper provided in the case for isolating the first passage from the second passage for supplying the external air into the room and discharging the room air to the outside, or communicating with the fist and second passages to guide the room air drawn into the second passage back into the room after passing through the air purifying member.

Abstract: A plasma display panel for improving a color coordinates correction and a color temperature is disclosed. In the plasma display panel, a vertical barrier rib separates red, green and blue discharge cells from each other in a longitudinal direction. A horizontal barrier rib is provided between the vertical barrier ribs to separate the red, green and blue discharge cells from each other in a wide direction. The horizontal barrier rib has a first horizontal barrier rib provided between the red discharge cells, a second horizontal barrier rib provided between the green discharge cells, and a third horizontal barrier rib provided between the blue discharge cells and having a smaller width than the first and second horizontal barrier ribs.

Abstract: The present invention relates to an ironing plate. Double sides may be used for ironing. In the present invention, front and back surfaces as well as curved portions of clothes are effectively ironed without forming wrinkles in a state that clothes are putted onto an ironing plate through a 3D ironing surface formed based on the curves of human body. In addition, ironing parts are provided based on the characteristic of each part of upper garment, sleeve of upper garment and lower garment for thereby enhancing an ironing efficiency.

Abstract: The present invention relates to a repeater for amplifying signals transmitted and received between a communications terminal such as cellular phone and a base station and, more particularly, to a repeater for mobile communications system, which amplifies the signal received from the communications terminal accommodatively to intensity of the signal, or correlatively with the existence of the input signal, and transmits the amplified signal to the base station. The repeater of the invention establishes a line coupler 7 on a transmission line for a first amplifier 5 amplifying the frequency signal received from the terminal and divides the frequency signal input to the first amplifier 5. A gain control signal generator 8 generates a gain control signal corresponding proportionally to a level of the frequency signal divided by the line coupler 7 and applies the gain control signal to the first amplifier 5.