Abstract: The invention relates to an Infra Red Closed Circuit Television (IR CCTV) surveillance camera equipped with IR LEDs that can irradiate IR light on a subject, properly illuminating the entire subject according to the distance to the subject, by moving the IR LEDs back from the subject and retracting the LEDs into reflecting sections when the subject is at a far distance, to thereby concentrate the IR light at a distance via a focused, concentrated, and/or collimated beam. The camera moves forward the IR LEDs toward the subject when the subject is nearby, such that the LEDs protrude from the reflecting sections to provide a dispersed beam to properly illuminate the entire nearby subject.

Abstract: Provided are a nanoporous membrane and a method of fabricating the same. The nanoporous membrane includes a support, and a separation layer including a plurality of nano-sized pores at a density of 1010/cm2 or greater and a matrix. The nanoporous membrane has a high flux and a high selectivity.

Abstract: A plasma display panel is disclosed. The plasma display panel includes a first panel including address electrodes, a first dielectric layer, and a phosphor layer formed on a first substrate, and a second panel bonded with the first panel by interposing barrier ribs therebetween, the second panel including a plurality of transparent electrodes and bus electrodes, a second dielectric layer, a first protective layer containing magnesium oxide doped with a crystalline oxide, and a second protective layer containing crystalline magnesium oxide.

Abstract: A plasma display panel and a method for manufacturing the same, which are capable of achieving a reduction in the number of manufacturing processes and a reduction in manufacturing costs, are disclosed. The plasma display panel includes a first substrate including a first electrode, and a second substrate arranged to face the first substrate. The second substrate includes a second electrode arranged to intersect with the first electrode. At least one of the first and second electrodes include a powder mixture comprising Ag powder, and metal powder of at least one selected from a group consisting of Li, K, Ba, Ca, Na, Mg, Al, Zn, Fe, Cd, Co, Ni, Sn, Pb, Cu, Hg, Pt, and Au, and mixed with the Ag powder in a volume ratio of 0.1 to 50 mol % with respect to the Ag powder.

Abstract: Disclosed is a plasma display panel. A plasma display panel according to an embodiment of the present invention comprises a front substrate and a rear substrate attached to each other with a predetermined distance therebetween, a plurality of barrier ribs disposed between the front and rear substrates creating a plurality of discharge cells, and a plurality of scan electrodes and a plurality of sustain electrodes which are alternately arranged in each discharge cell. The plasma display panel has the enhanced discharge efficiency and emission efficiency. Further, the plasma display panel can be manufacture at low cost.

Abstract: A porous polyethylene hollow fiber membrane having a pore-size gradient across the inner and outer surfaces thereof is prepared by introducing, during the cooling step of a melt-spun polyethylene hollow fiber, a nitrogen flow and a solvent having a boiling point in the range of 30 to 80° C. to the inner and outer surfaces of the melt-spun hollow fiber, respectively.

Abstract: A porous polyethylene hollow fiber membrane having a pore-size gradient across the inner and outer surfaces thereof is prepared by introducing, during the cooling step of a melt-spun polyethylene hollow fiber, a nitrogen flow and a solvent having a boiling point in the range of 30 to 80° C. to the inner and outer surfaces of the melt-spun hollow fiber, respectively.

Abstract: A semiconductor manufacturing apparatus and a coolant circulating method are provided. The semiconductor manufacturing apparatus includes: at least two chamber bodies; a chamber lid constituting common tops of at least the two chamber bodies; first and second manifolds supplying a process gas to at least the two chamber bodies, respectively; a third manifold supplying a cleaning gas to at least the two chamber bodies; and first and second coolant lines supplying and retrieving a coolant to the third manifold.

Abstract: An internet telephone communication system including a voice transmitting and receiving parts and a method of operating the system are disclosed. The voice transmitting part retransmits voice data packets at least once through an internet network according to a retransmission frequency information packet received from the voice receiving part. The voice receiving part transmits the retransmission frequency information packet to the voice transmitting part in order to request to retransmit the voice data packets R times, where R is determined based a data loss rate calculated. By retransmitting the voice data packets, the transmitting rate of the data and the corresponding VOIP conversation quality are greatly improved.

Abstract: The present invention relates to a VoIP (Voice over Internet Protocol) system and a method for preventing data loss in the same. A receiving system in the VoIP system decides a hold time corresponding to the loss rate of compressed voice data, and provides the hold time to a transmission system. The transmission system adjusts voice input speed depending on the hold time. Therefore, the transmission system can regulate compressed voice data generation rate therein not to exceed a designated channel capacity.

Abstract: A phase delay element includes a brightness enhancement layer intermediate a reflection layer and an artificial light. The brightness enhancement layer is defined by a first surface and an opposite second surface. The first surface faces the reflection layer. A first light from the artificial light is incident on the second surface. A phase of the first light is delayed by about ¼ phase (?/4) so that a second light is emitted from the first surface toward the reflection layer. The second light is reflected from the reflection layer so that a third light is emitted from the reflection layer toward the first surface. A phase of the third light is delayed by about ¼ phase (?/4) so that a fourth light is emitted from the second surface. Therefore, a portion of the artificial light, which is reflected from the reflection layer, is recycled to improve a luminance of an LCD apparatus.

Abstract: The present invention relates to an internet telephone and a method for recovering voice data lost in the internet telephone. Whether there is any voice data lost in a voice data packet received via the internet network and the position information for a lost portion of the voice data is obtained. A voice data normally received previously to the lost portion is filled in the lost portion of the voice data. In making a telephone call using the internet, the speech quality is improved by correcting the lost voice signal.

Abstract: The present invention relates to a network encryption system and method, and particularly, to a network encryption system and method involving the encryption and/or decryption of user data using random number generation. Even more particularly, the present invention relates to encryption and/or decryption of user data using random numbers that are generated using a portion of the user data discriminated from the data frame or the data packet.

Abstract: An internet telephone communication system including a voice transmitting and receiving parts and a method of operating the system are disclosed. The voice transmitting part retransmits voice data packets at least once through an internet network according to a retransmission frequency information packet received from the voice receiving part. The voice receiving part transmits the retransmission frequency information packet to the voice transmitting part in order to request to retransmit the voice data packets R times, where R is determined based a data loss rate calculated. By retransmitting the voice data packets, the transmitting rate of the data and the corresponding VOIP conversation quality are greatly improved.

Abstract: The present invention relates to a VoIP (Voice over Internet Protocol) system and a method for preventing data loss in the same. A receiving system in the VoIP system decides a hold time corresponding to the loss rate of compressed voice data, and provides the hold time to a transmission system. The transmission system adjusts voice input speed depending on the hold time. Therefore, the transmission system can regulate compressed voice data generation rate therein not to exceed a designated channel capacity.

Abstract: The present invention relates to an internet telephone and a method for recovering voice data lost in the internet telephone. Whether there is any voice data lost in a voice data packet received via the internet network and the position information for a lost portion of the voice data is obtained. A voice data normally received previously to the lost portion is filled in the lost portion of the voice data. In making a telephone call using the internet, the speech quality is improved by correcting the lost voice signal.

Abstract: A mounting structure of a change lever in a vehicle constructed and arranged to absorb an allowance between a housing and a ball rotatively pivoting a lower end of the change lever to rule out generation of noise and to prevent leakage of lubricant coated on a frictional part located therebetween, thereby improving a lever-shifting feeling, the change lever having a change lever knob thereon and a ball thereunder and accommodated in a housing forming a spherical inner space therein for rotation, the structure comprising a support member integrally formed at a lower end of the change lever with a cylindrical upper body unit inserted into a change lever and a spherical inner lower body unit having its diameter expanded at a lower part of the upper body unit and its upper surface adhered to a lower surface of the ball and its lower surface adhered to an inner surface of the housing.

Abstract: A method for non-active processing of an etched surface in a vertical-cavity surface-emitting laser diode is provided. In order to obtain a stable single fundamental transverse mode, at a low temperature of 100 to 300 degrees, an amorphous GaAs is deposited on a surface of an etched active layer and an etched cavity. Also, a bottom emitting laser is provided which is formed by, with the metal electrode as a mask, etching the top mirror layer and the active layer, depositing the amorphous GaAs onto the etched portion and planarizing the deposited GaAs layer and depositing p-type metal pad over the amorphous GaAs around the formed laser device. Also, a top emission type laser is provided which is formed by, with a photoresist as a mask, etching the top mirror layer and the active layer, planarizing the GaAs layer and depositing p-type metal pad containing a window for light emission which is made smaller than laser area over the amorphous GaAs around the formed laser device.

Abstract: The present invention is a vertical resonant surface-emitting laser, and more particularly, a method for making a micro-laser that can be emitted to the upper surface of resonance structures by forming electrodes on the side surface of the resonance structures. By forming the electrodes injecting the current to the active layer on the side surface of resonators, the electrodes may be formed more easily on the fine micro-laser. Moreover, the current is more efficiently injected to the inside the active layer due to the side electrode surrounding an upper glass layer and emitter, and the laser may be operated even with a smaller start current, and serial resistance of the resonators may be reduced.