Abstract: An electroabsorption (EA) duplexer in which an optical amplifier, a photodetector, and an optical modulator are monolithically integrated to obtain a high radio frequency (RF) gain in radio-over fiber (RoF) link optical transmission technology is provided. The EA duplexer includes a substrate, a separation area, an optical detection/modulation unit, and an optical amplification unit. The separation area includes a first epitaxial layer formed of at least one material layer on the substrate. The first epitaxial layer functions as a first optical waveguide. The optical detection/modulation unit includes a second epitaxial layer formed of at least one material layer on the first epitaxial layer to detect and modulate an optical signal. The second epitaxial layer functions as a second optical waveguide. The optical amplification unit includes the second optical waveguide and a third epitaxial layer formed of at least one material layer on the second epitaxial layer to amplify an optical signal.

Abstract: A single side band (SSB) response method of a radio frequency identification (RFID) tag receives a double side band (DSB) response signal whose frequency band is shifted from the RFID tag by shifting an SSB frequency band after transmitting an SSB command signal to an RFID tag. Even though the reader uses the SSB frequency band, the reader can receive a stable DSB response signal from the RFID tag.

Abstract: Disclosed is a correlation method to adaptively operate in a time varying phase and a correlator thereof. A correlation method according to the present invention includes performing the first correlation according to a certain reference value and a certain reference interval for correlation of a received signal; calculating an average variation of the received signal through the result of performing the first correlation; deciding a new reference value for the second correlation through the average variation; performing the second correlation according to the new reference value and the reference interval; and selecting the maximum value among the result of performing the second correlation. Accordingly, plural references are decided considering variation of a response signal between tags and also separate plural references are decided considering bit variation of a response signal in the same tag, so that a digital signal can be ideally demodulated in the environment where signal phase variation occurs.

Abstract: When a reader of a Radio Frequency Identification (RF-ID) system sends out a command signal to the RF-ID tag and receives a response signal from the RF-ID tag, an End of Signal (EOS) of the received response signal is detected such that the next command signal can be transmitted within a time. Accordingly, response signal can be detected even under the environment of poor signal to noise ratio performance, and the EOS of the response signal from the RF-ID tag can be recognized with ease and speed.

Abstract: An apparatus of a light source for a liquid crystal display includes two transformers connected between a driver and respective lamps, and a driving signal from a driver is supplied to the lamps through the transformers. Secondary sides of the transformers are connected to each other, and a node between the transformers works as a neutral point in that loads connected to the transformers are symmetrical. The neutral point moves when the symmetry of the load distribution is broken under abnormal operation such as arc generation due to disconnection of the transformers. The movement of the neutral point increases the voltage at the node between the transformers and the driver is shut down when a voltage divided from the voltage of the node is larger than a reference voltage.

Abstract: A signal transmitting and receiving method in a wireless network use a reader creates a pulse width list relating to pulse widths of transmission signals; transmits signals in sequence according to the created pulse width list; and receives a reply signal with respect to the transmitted signals. The method includes creating a pulse width list relating to pulse widths of the transmitted signals; transmitting signals in sequence according to the created pulse width list; and creating an available pulse width list including a corresponding pulse width in response to receiving a reply signal from the transmitted signals; and transmitting signals in sequence according to the created available pulse width list.

Abstract: An identification (ID) anti-collision method using a data structure to be applied to a radio frequency identification (RFID) system, includes transmitting an ID transmission request command from the reader to the tags using a predetermined request value; determining whether the IDs of the tags collide with one another, based on a bit pattern transmitted from the tags; if the IDs of the tags collide, computing a next request value to be used at a next request to transmit a request command, and if the IDs of the tags do not collide, computing and storing a future request value to be used; and if the IDs of the tags do not collide, transmitting and receiving data and a tag using an ID of the tag corresponding to the bit pattern and if the requested value is stored, transmitting a request command using the stored request value.

Abstract: In a lamp and method for fabricating the same, an outer surface of the lamp tube is dipped into a conductive transparent solution for forming an electrode by a predetermined depth, and then the lamp tube is pulled out from the solution. Accordingly, an electrode having different profiles is formed on the outer surface of the tube body. Also, the outer surface of the lamp tube is dipped into the solution by an acute angle, and is pulled out from the solution. Therefore, a problem of a nonuniform brightness between lamps is not generated, and light utilization efficiency is much enhanced even when using a plurality of lamp in parallel connected to a power supply.

Abstract: A reader, tags, an RFID system, and a method of simultaneously identifying a plurality of tags having colliding reply signals and reducing the reading time. In the RFID system including a reader and plural tags assigned unique IDs, the reader stores a comparison code which identifies ID codes generated based on the unique IDs of the tags, and issues a query signal to the tags to inquire into the presence of the tags. In response to the received query signal, the tags generate the ID) codes based on their unique IDs and sends the ID codes to the reader. The reader stores the received ID codes and identifies the responding tags by comparing the stored comparison code with the ID codes. When the ID codes are orthogonal, colliding reply signals can be resolved through a correlation technique.

Abstract: A lamp, lamp holder, and a power supply substrate that allow easy fabrication of a backlight assembly or a power supply module for a display device are presented. The lamp includes a lamp tube and an electrode that extends outside the lamp tube to form a lamp lead. The lamp holder includes a body for holding the lamp tube and a power supply member for providing voltage to the lamp lead. A power supply module includes a power supply substrate combined with a lamp holder holding the lamp. The lamp holders are fixed to fixing portions of the power supply substrate or to fixing holes of a connection plate. As the design allows easy separation of the lamp holders from the power supply substrate, building a backlight assembly or a display device is facilitated.

Abstract: A channel selection method for reading tag information, a channel selection apparatus of an RFID reader applying the same, and an RFID reader. A channel selection apparatus of a radio frequency identification (RFID) reader equipped within a wireless communication portable terminal, includes a channel selection unit which selects a channel to read tag information stored in an RFID tag, and a channel determination unit which, when determining that the selected channel is not used by another RFID reader, determines the selected channel to be a channel to read the tag information. Accordingly, when a plurality of RFID readers reads out the tag information from the RFID tag almost at the same time, the interference among them can be avoided.

Abstract: An anti-collision method is provided for a radio frequency identification (RFID) system including a reader, and two or more tags each having an ID. The anti-collision method includes transmitting an ID request value from the reader to the respective tags, the ID request value containing one or more of the codes forming the ID, receiving the ID from at least one of the tags which contain the ID request value, when a plurality of IDs collide, requesting the tags for a value representing a position of collision, and receiving the value representing the position of collision from the tags and identifying the IDs of the tags. Because collision pattern of the bits of respective IDs is recognized, and a plurality of IDs are recognized, the number of transmissions between the reader and the tags can be reduced.

Abstract: An apparatus of driving a light source for a display device includes a switching unit for selectively transmitting a DC input voltage, an oscillator for converting the DC input voltage into an AC voltage, and a transformer including a primary coil and a secondary coil for boosting the converted AC voltage using mutual inductance and for providing the boosted voltage for the light source. The driving apparatus further includes a current sensor for sensing a current in the oscillator or the secondary coil, and a light controller for controlling the switching unit based on the sensed current by the current sensor and a dimming control signal from an external device. Therefore, the current in the light source can be detected without a separate wire for connecting the light source and the light controller.

Abstract: A system for protecting signal emitting tag related information and a method thereof are provided. The method of protecting the signal emitting tag related information includes operations of receiving a request for the signal emitting tag related information, which is information related to a the signal emitting tag, and providing the requested signal emitting tag related information after authenticating the request. Therefore, a non-permitted user can be prevented from reading the signal emitting tag related information so that the signal emitting tag related information can be protected.

Abstract: A lamp assembly includes a lamp having two electrodes, a power supply module formed with a clip for gripping the electrodes, a base body on which at least two power supply modules are intermittently disposed in series, and an insulating partition for insulating the power supply modules from each other.

Abstract: A radio frequency identification (RFID) reader for offering tag related information and a method thereof are provided. The RFID reader includes a communicator which receives a radio frequency (RF) signal from an RFID tag, a controller which calculates location information of the RFID tag on the basis of the RF signal, and a display information generator which processes the location information of the RFID tag to be displayed on a display. Accordingly, even when a plurality of RFID tags are located around the reader, a user can identify the RFID tags with the identifications (IDs) of the RFID tags read by the reader.

Abstract: A radio frequency identification (RFID) tag and a RFID reader for anti-collision, and an operation method thereof are provided. The RFID tag includes a tag receiving part for receiving a tag recognition signal from a RFID reader, a tag transmitting part for transmitting a response signal and a tag data in response to the tag recognition signal, a mode switching part for switching current mode into a predetermined mode, and a controlling part for causing the predetermined mode to be switched by the mode switching part, when the response signal is transmitted by a predetermined number of times by the tag transmitting part. Accordingly, when a few number of RFID tags are used, collision of tag data can be prevented at the RFID reader, and the RFID tags are rapidly recognized.

Abstract: In a lamp and method for fabricating the same, an outer surface of the lamp tube is dipped into a conductive transparent solution for forming an electrode by a predetermined depth, and then the lamp tube is pulled out from the solution. Accordingly, an electrode having different profiles is formed on the outer surface of the tube body. Also, the outer surface of the lamp tube is dipped into the solution by an acute angle, and is pulled out from the solution. Therefore, a problem of a nonuniform brightness between lamps is not generated, and light utilization efficiency is much enhanced even when using a plurality of lamp in parallel connected to a power supply.

Abstract: A mobile radio frequency identification (RFID) reader, a portable terminal having the same, and an RF transmission (Tx) power setting method thereof. The RF Tx power setting method includes selecting an RF Tx power of an RF Tx power which is used to read tag information from an RF identification (RFID) tag; and setting the selected RF Tx power to a Tx power of the RF Tx signal. Accordingly, since it is possible to variably set the Tx power of the RF Tx signal used to read out the tag information from the RFID tag, the power consumption can be reduced at the RFID reader or the portable terminal equipped with the RFID reader.

Abstract: A method for reconfiguring an application in a pervasive computing environment, includes receiving a request for a reconfiguration of a predetermined application reconfiguration according to a change in a context, searching a service in response to the change in the context with respect to each of at least one service component configuring the predetermined application, and reconfiguring the predetermined application based on the searched service.