Abstract: A voice communication method and system that enables establishing a voice communication in a URC environment is provided. The voice communication method and system of the present invention allow establishing a voice communication channel between terminals (private IP address to private IP address, public IP address to public IP address, and private IP address to public IP address) in a URC environment. Particularly, the voice communication system of the present invention is implemented with a call server acting as a STUN server for supporting voice communication between two terminals of which one is assigned private IP address and controlling the communication session in the URC environment.

Abstract: A software robot apparatus (sobot apparatus) with a genetic code is disclosed. The sobot apparatus includes an application module, an artificial animated object engine, a sobot protocol module, an update agent, an update protocol module, a network interface, a sobot player, a script engine, a player database, a repository interface, a sobot graphic/audio interface, a 3D engine, a system software, a memory device, a display part, and an audio output part.

Abstract: Provided are a network-based robot control system and a robot velocity control method in the network-based robot control system. A client calculates a robot control velocity according to its reception state of video data frames captured by a robot, generates a robot control message including the calculated robot control velocity, and transmits the robot control message to the robot. The robot then changes its velocity according to the robot control velocity included in the received robot control message. In this way, the velocity of the robot is controlled according to the video data reception state of the client, thereby allowing a user to easily control the robot regardless of the performance of the client.

Abstract: The present invention relates to an apparatus and method for driving a PDP (plasma display panel). An image signal processor of the apparatus performs gamma correction and error diffusion processes of input image signals. A quantization error compensator compensates quantization errors with respect to an automatic power control (APC) level of image data output from the image signal processor. An error diffuser sets part of the image data output from the quantization error compensator as display errors and diffuses the display errors to peripheral pixels. A memory control and address driver generates sub-field and address data corresponding to image data that have undergone error diffusion by the error diffuser, and applies the data to the PDP. An APC and sustain/scan pulse generator generates a sub-field arrangement structure according to the APC level, generates control signals based on the generated sub-field arrangement, and applies the control signals to the PDP.

Abstract: Disclosed are a PDP and a driving method thereof. A falling ramp, having the same or greater gradient as that of a falling ramp pulse applied to a Y electrode, is applied to an X electrode in part of a Y ramp falling period during which a falling ramp pulse is applied to the Y electrode. Therefore, high-rate addressing may be allowed and discharge efficiency may be improved since the maximum wall voltage may be formed within a range in which no erroneous discharge may be generated to the X and Y electrodes in a reset period.

Abstract: A PDP address data processor, a method thereof, and a recording medium for storing a program used to perform the method. The address data processor generates subfield data corresponding to RGB input video data, divides them into two sets of subfield data, and stores them in a frame memory using rising and falling edges of a reference clock signal of a frame memory. The address data processor reads and arranges the stored subfield data using the rising and falling edges to generate address data for representing gray on the PDP. The address data processor uses an RGB mixing algorithm for selecting two different video data from among the RGB input video data to select video data, and generates the subfield data corresponding to the selected video data.

Abstract: A voice communication method and system that enables establishing a voice communication in a URC environment is provided. The voice communication method and system of the present invention allow establishing a voice communication channel between terminals (private IP address to private IP address, public IP address to public IP address, and private IP address to public IP address) in a URC environment. Particularly, the voice communication system of the present invention is implemented with a call server acting as a STUN server for supporting voice communication between two terminals of which one is assigned private IP address and controlling the communication session in the URC environment.

Abstract: A PDP address data processor, a method thereof, and a recording medium for storing a program used to perform the method. The address data processor generates subfield data corresponding to RGB input video data, divides them into two sets of subfield data, and stores them in a frame memory using rising and falling edges of a reference clock signal of a frame memory. The address data processor reads and arranges the stored subfield data using the rising and falling edges to generate address data for representing gray on the PDP. The address data processor uses an RGB mixing algorithm for selecting two different video data from among the RGB input video data to select video data, and generates the subfield data corresponding to the selected video data.

Abstract: An apparatus for driving a discharge display panel using dual subfield coding, which can prevent a gradient low discharge effect due to an address discharge failure by performing a subfield gradient weight design, by which a subfield gradient has a plurality of redundancies in all gradients except gradients having the lowest gradient weight and the highest gradient weight, and a dynamic dual subfield coding. The apparatus divides an image signal into frame units, obtains an input gradient of a frame from the image signal, performs a time division gradient display on the discharge display panel according to the input gradient by dividing the frame into a plurality of subfields having respective gradient weights, and has at least two subfields having a least gradient weight.

Abstract: A software robot apparatus (sobot apparatus) with a genetic code is disclosed. The sobot apparatus includes an application module, an artificial animated object engine, a sobot protocol module, an update agent, an update protocol module, a network interface, a sobot player, a script engine, a player database, a repository interface, a sobot graphic/audio interface, a 3D engine, a system software, a memory device, a display part, and an audio output part.

Abstract: In a method of resetting a plasma display panel including a front substrate and a rear substrate separated from each other and facing each other, in which a first electrode line and second display electrode line are formed parallel to each other on the front substrate and address electrode lines are formed perpendicular to the first electrode line and the second display electrode lines, a voltage applied to the first display electrode lines is gradually increased up to a first voltage. Then, a voltage applied to the second display electrode lines is gradually increased up to a second voltage higher than the first voltage while the voltage applied to the first display electrode lines is gradually increased up to a third voltage lower than the first voltage. The voltage applied to the first display electrode lines is maintained at the first voltage while the voltage applied to the second display electrode lines is gradually decreased down to a fourth voltage lower than the third voltage.

Abstract: Provided are a network-based robot control system and a robot velocity control method in the network-based robot control system. A client calculates a robot control velocity according to its reception state of video data frames captured by a robot, generates a robot control message including the calculated robot control velocity, and transmits the robot control message to the robot. The robot then changes its velocity according to the robot control velocity included in the received robot control message. In this way, the velocity of the robot is controlled according to the video data reception state of the client, thereby allowing a user to easily control the robot regardless of the performance of the client.

Abstract: The present invention relates to an apparatus and method for driving a PDP (plasma display panel). An image signal processor of the apparatus performs gamma correction and error diffusion processes of input image signals. A quantization error compensator compensates quantization errors with respect to an automatic power control (APC) level of image data output from the image signal processor. An error diffuser sets part of the image data output from the quantization error compensator as display errors and diffuses the display errors to peripheral pixels. A memory control and address driver generates sub-field and address data corresponding to image data that have undergone error diffusion by the error diffuser, and applies the data to the PDP. An APC and sustain/scan pulse generator generates a sub-field arrangement structure according to the APC level, generates control signals based on the generated sub-field arrangement, and applies the control signals to the PDP.

Abstract: The present invention relates to an apparatus and method for driving a PDP (plasma display panel). An image signal processor of the apparatus performs gamma correction and error diffusion processes of input image signals. A quantization error compensator compensates quantization errors with respect to an automatic power control (APC) level of image data output from the image signal processor. An error diffuser sets part of the image data output from the quantization error compensator as display errors and diffuses the display errors to peripheral pixels. A memory control and address driver generates sub-field and address data corresponding to image data that have undergone error diffusion by the error diffuser, and applies the data to the PDP. An APC and sustain/scan pulse generator generates a sub-field arrangement structure according to the APC level, generates control signals based on the generated sub-field arrangement, and applies the control signals to the PDP.

Abstract: An apparatus for driving a discharge display panel using dual subfield coding, which can prevent a gradient low discharge effect due to an address discharge failure by performing a subfield gradient weight design, by which a subfield gradient has a plurality of redundancies in all gradients except gradients having the lowest gradient weight and the highest gradient weight, and a dynamic dual subfield coding. The apparatus divides an image signal into frame units, obtains an input gradient of a frame from the image signal, performs a time division gradient display on the discharge display panel according to the input gradient by dividing the frame into a plurality of subfields having respective gradient weights, and has at least two subfields having a least gradient weight.

Abstract: A method of driving a display panel includes: quantizing a sustain pulse; and performing a sustain discharge by supplying a ramp-type sustain pulse in at least one sub-field. Accordingly, it is possible to prevent low gray-scale display deterioration due to the quantization of sustain pulses by performing a sustain discharge using a ramp-type sustain pulse.

Abstract: In a plasma display panel, a period of a sustain discharge waveform alternately applied to scan electrodes and sustain electrodes during a sustain period is varied with a display load ratio. That is, the period of the sustain discharge waveform is reduced because light caused by the sustain discharge waveform is stabilized when the display load ratio is lower. Accordingly, an idle period that is increased when the period of the sustain discharge waveform is decreased can be allocated to an address period or a reset period.

Abstract: In a method of resetting a plasma display panel including a front substrate and a rear substrate separated from each other and facing each other, in which a first electrode line and second display electrode line are formed parallel to each other on the front substrate and address electrode lines are formed perpendicular to the first electrode line and the second display electrode lines, a voltage applied to the first display electrode lines is gradually increased up to a first voltage. Then, a voltage applied to the second display electrode lines is gradually increased up to a second voltage higher than the first voltage while the voltage applied to the first display electrode lines is gradually increased up to a third voltage lower than the first voltage. The voltage applied to the first display electrode lines is maintained at the first voltage while the voltage applied to the second display electrode lines is gradually decreased down to a fourth voltage lower than the third voltage.

Abstract: A plasma display panel (PDP) driver and PDP gray scale representation method for applying a sustain pulse based subfield arrangement and address light for representation of gray scales and improving representation performance of gray scales. Inverse gamma correction is performed on input image signals so as to represent inverse gamma correction gray scales corresponding to a number of sustain pulses and address light. The inverse gamma correction gray scale is inverted into a subfield based on the number of sustain pulses so as to represent the gray scale through address light and light caused by the number of sustain pulses.

Abstract: Disclosed are a PDP and a driving method thereof. A falling ramp, having the same or greater gradient as that of a falling ramp pulse applied to a Y electrode, is applied to an X electrode in part of a Y ramp falling period during which a falling ramp pulse is applied to the Y electrode. Therefore, high-rate addressing may be allowed and discharge efficiency may be improved since the maximum wall voltage may be formed within a range in which no erroneous discharge may be generated to the X and Y electrodes in a reset period.