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| 20090269051 | METHOD OF CONTROLLING OPTICAL OUTPUT POWER AND PASSIVE OPTICAL NETWORK SYSTEM USING THE SAME - Provided are an optical output power control method that provides optical communication without harming the human body even when a transmission line is cut or no optical network unit (ONU) accesses a communication system, and a passive optical network (PON) system using the method. In the method, an optical signal having a predetermined period is transmitted when an optical communication system is in an abnormal state, wherein the predetermined period includes a laser-on time interval in which the optical signal has a normal power level and a laser-off time interval in which the optical signal is off or has a power level lower than the normal power level, so that the optical communication system performs optical communication without harming the human body even during the abnormal state. | 10-29-2009 |
| 20090269066 | Single-Unit Integrated Transceiver Having Pump Source and Transceiver Module Using the Same - Provided are a sing-unit integrated transceiver having a pump source and a transceiver module using the transceiver. The single-unit integrated transceiver includes: an optical transmitter converting an input electric signal into a downstream optical signal; an optical receiver converting a received upstream optical signal into an electric signal; the pump source amplifying the downstream or upstream optical signal using a gain medium positioned in an optical transmission line to amplify an output optical signal; a convergence unit arranging or converging the downstream and upstream optical signals to/from the optical transmission line; and a multiplexing and/or a demultiplexing filter, the multiplexing filter positioned on an optical path between the optical transmitter/pump source and the convergence unit, and multiplexing the downstream optical signal and the amplified optical signal to pass to the convergence unit, the demultiplexing filter positioned on an optical path between the convergence unit and the optical receiver and demultiplexing the upstream optical signal to pass to the optical receiver. | 10-29-2009 |
| 20100272437 | TDMA PASSIVE OPTICAL NETWORK OLT SYSTEM FOR BROADCAST SERVICE - Provided is a TDMA (time division multiple access) PON (passive optical network) OLT (optical line terminal) system for a broadcast service, including packet processor determining information according to types of frames (unicast, multicast, and broadcast frames) and a switch output port using header information (an IP address of a packet header, MAC (medium access control) addresses of Ethernet frames, and the like) of data received from an external node or the ONT (optical network terminal) and attaching the information to header parts of the frames to generate second data, a switch copying the second data by a predetermined number of times according to a transmission method and transmitting the second data to a corresponding destination output port according to the identification codes, M TDMA PON MAC processors removing the identification codes added to the second data and converting the second data into TDMA PON frames, and M optical transceivers converting the TDMA PON frames into optical signals and transmitting the optical signals to an ONT. | 10-28-2010 |
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| 20080231552 | PLASMA DISPLAY APPARATUS - A plasma display apparatus includes a plasma display panel (PDP) including a front panel with a plurality of scan electrodes and sustain electrodes formed thereon and a rear panel with a plurality of address electrodes formed thereon and a driving circuit that applies drive signals to the scan, sustain and address electrodes so that driving can be performed by time-division of one frame of an image displayed on the PDP into a plurality of sub-fields. Each sub-field includes reset, address, and sustain periods, and a first signal that gradually falls is applied to the scan electrodes during the address period. | 09-25-2008 |
| 20090115695 | PLASMA DISPLAY APPARATUS - The present invention relates to a plasma display apparatus. The plasma display apparatus includes a first layer and a second layer over an upper substrate of a plasma display panel. The first layer emits light having a peak at a first wavelength region with light emitted from a discharge space. The second layer emits light having a peak at a second wavelength region lower than the first wavelength region with light emitted from a discharge space. The first layer and the second layer are disposed over a dielectric layer of the upper substrate. The plurality of scan electrodes are divided into first and second groups and then supplied with scan signals, cycles of scan signals supplied in first and second subfields of a plurality of subfields constituting one frame are identical to each other, and scan bias voltages supplied to the first and second groups in at least any one period of an address period are different from each other. | 05-07-2009 |
| 20090115702 | METHOD OF DRIVING PLASMA DISPLAY PANEL AND PLASMA DISPLAY APPARATUS THEREOF - The present invention relates to a plasma display apparatus and, more particularly, to a method of driving a plasma display panel. The plasma display apparatus includes a plasma display panel including a plurality of scan electrodes and sustain electrodes formed on an upper substrate, and a plurality of address electrodes formed on a lower substrate, and a driver for supplying driving signals to the plurality of electrodes. The plurality of scan electrodes are divided into first and second groups and then supplied with scan signals, and scan bias voltages supplied to the first and second groups in at least any one period of an address period are different from each other. In at least one of a plurality of subfields constituting one frame, a width of a first sustain signal of a plurality of sustain signals supplied during a sustain period is larger than a width of each of the remaining sustain signals. | 05-07-2009 |
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| 20090019349 | METHOD AND SYSTEM FOR EXPOSING GAMES - A game exposing method and system is provided. The game exposing method includes displaying a game web site in a first folder of a file manager application of a user terminal; and displaying a game provided from the game web site in a second folder of the file manager application. Accordingly, it is possible to easily access the game portal web site and the game pages to play the games while operating in the file manager application. | 01-15-2009 |
| 20100054507 | FILM SPEAKER - A film speaker is provided. The film speaker includes: a piezoelectric film oscillating by receiving a voltage corresponding to a sound signal from a sound signal supply unit; a plurality of carbon nanotube films formed on both sides of the piezoelectric film; and a plurality of electrodes connected to the plurality of carbon nanotube films, receiving the voltage corresponding to the sound signal from the sound signal supply unit, and applying the voltage to the plurality of carbon nanotube films. | 03-04-2010 |
| 20100328328 | HYBRID ELECTRIC DEVICE USING PIEZO-ELECTRIC POLYMER SUBSTRATE AND ITS FABRICATION METHOD - The present invention relates to an integrated, composite hybrid electric device in which various devices are formed as a single unit on one flexible substrate, and a fabrication method thereof. More particularly, the present invention a hybrid electric device in which a display device, a vibration-generating (or vibration-sensing) device, and a non-volatile memory device are formed on a single flexible piezoelectric polymer substrate into a single unit by using a flexible piezoelectric polymer substrate whose both surfaces are thinly deposited with a patterned transparent oxidation electrode, and a fabrication method thereof. | 12-30-2010 |
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| 20100238152 | PLASMA DISPLAY DEVICE - A method of driving a plasma display panel (PDP) and a plasma display device using the same are provided. In the plasma display device, a plurality of scan electrodes formed on the PDP are divided into first and second groups to supply scan signals. When a scan bias voltage is higher in a first subfield in first and second subfields, lowermost voltages of reset signals are higher in the second subfield. According to the plasma display device, when the plurality of scan electrodes are divided into at least two groups to be driven, the lowermost voltages of the reset signals are controlled in accordance with a scan bias voltage so that it is possible to reduce address erroneous discharge in accordance with the loss of wall charges, to prevent the generation of brilliant points, and to improve the picture quality of a displayed image. | 09-23-2010 |
| 20100238155 | PLASMA DISPLAY DEVICE - A plasma display device is provided. In the plasma display device, a plurality of scan electrodes are divided into one or more scan electrode groups, and different driving signals are applied to the scan electrode groups. More specifically, different scan bias voltages are applied to the scan electrodes during a scan period, and different signals are applied to the scan electrodes during a set-down period of a reset period. Therefore, it is possible to stabilize an address discharge in scan electrodes to which scan signals are applied late. | 09-23-2010 |
| 20100265240 | PLASMA DISPLAY DEVICE - A plasma display device is provided. The plasma display device includes a plasma display panel (PDP) which has an upper substrate, a lower substrate, a plurality of scan electrodes and a plurality of sustain electrodes that are disposed on the upper substrate, and a plurality of address electrodes that are disposed on the lower substrate; and a driving unit which applies driving signals to the scan electrodes, the sustain electrodes and the address electrodes. The driving unit drives the scan electrodes in units of scan electrode groups during an address period, and applies different voltages to the scan electrodes, thereby enabling an address discharge to be stably performed. | 10-21-2010 |
| 20100302224 | PLASMA DISPLAY DEVICE - A plasma display device is provided. In the plasma display device, a plurality of scan electrodes are divided into one or more scan electrode groups, and different driving signals are applied to the scan electrode groups. More specifically, a minimum voltage detected during a set-down period of a reset period is made to be discrepant from a scan voltage, thereby reducing the amount by which wall charge is erased and stabilizing an address discharge. In addition, different driving signals are applied to a plurality of scan electrodes, and thus, it is possible to stabilize an address discharge even in scan electrodes to which a scan signal is applied late. | 12-02-2010 |
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| 20110049464 | Resistive random access memory device and memory array including the same - A resistive random access memory (RRAM) includes a resistive memory layer of a transition metal oxide, such as Ni oxide, and is doped with a metal material. The RRAM may include at least one first electrode, a resistive memory layer on the at least one first electrode, the resistive memory layer including a Ni oxide layer doped with at least one element selected from a group consisting of Fe, Co, and Sn, and at least one second electrode on the resistive memory layer. The RRAM device may include a plurality of first electrodes and a plurality of second electrodes, and the resistive memory layer may be between the plurality of first electrodes and the plurality of second electrodes. | 03-03-2011 |
| 20110147696 | Resistive random access memory devices and resistive random access memory arrays having the same - A resistive random access memory (RRAM) devices and resistive random access memory (RRAM) arrays are provided, the RRAM devices include a first electrode layer, a variable resistance material layer formed of an oxide of a metallic material having a plurality of oxidation states, an intermediate electrode layer on the variable resistance material layer and formed of a conductive material having a lower reactivity with oxygen than the metallic material, and a second electrode layer on the intermediate electrode layer. The RRAM arrays include at least one of the aforementioned RRAM devices. | 06-23-2011 |
| 20110161605 | Memory devices and methods of operating the same - A memory device includes a memory cell. The memory cell includes: a bipolar memory element and a bidirectional switching element. The bidirectional switching element is connected to ends of the bipolar memory element, and has a bidirectional switching characteristic. The bidirectional switching element includes: a first switching element and a second switching element. The first switching element is connected to a first end of the bipolar memory element and has a first switching direction. The second switching element is connected to a second end of the bipolar memory element and has a second switching direction. The second switching direction is opposite to the first switching direction. | 06-30-2011 |
| 20110220860 | Bipolar memory cells, memory devices including the same and methods of manufacturing and operating the same - Bipolar memory cells and a memory device including the same are provided, the bipolar memory cells include two bipolar memory layers having opposite programming directions. The two bipolar memory layers may be connected to each other via an intermediate electrode interposed therebetween. The two bipolar memory layers may have the same structure or opposite structures. | 09-15-2011 |
| 20110310652 | Variable resistance devices, semiconductor devices including the variable resistance devices, and methods of operating the semiconductor devices - Methods of operating semiconductor devices that include variable resistance devices, the methods including writing first data to a semiconductor device by applying a reset pulse voltage to the variable resistance device so that the variable resistance device is switched from a first resistance state to a second resistance state, and writing second data to the semiconductor device by applying a set pulse voltage to the variable resistance device so that the variable resistance device is switched from the second resistance state to the first resistance state to the second resistance state. The reset pulse voltage is higher than the set pulse voltage, and a resistance in the second resistance state is greater than in the first resistance state | 12-22-2011 |
| 20120018695 | Non-Volatile Memory Element And Memory Device Including The Same - Example embodiments, relate to a non-volatile memory element and a memory device including the same. The non-volatile memory element may include a memory layer having a multi-layered structure between two electrodes. The memory layer may include first and second material layers and may show a resistance change characteristic due to movement of ionic species therebetween. The first material layer may be an oxygen-supplying layer. The second material layer may be an oxide layer having a multi-trap level. | 01-26-2012 |
| 20120032132 | Nonvolatile Memory Elements And Memory Devices Including The Same - Nonvolatile memory elements may include a first electrode, a second electrode, a first buffer layer, a second buffer layer and a memory layer. The memory layer may be between the first and second electrodes. The first butter layer may be between the memory layer and the first electrode. The second buffer layer may be between the memory layer and the second electrode. The memory layer may be a multi-layer structure including a first material layer and a second material layer. The first material layer may include a first metal oxide which is of the same group as, or a different group from, a second metal oxide included in the second material layer. | 02-09-2012 |
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| 20100135660 | OPTICAL LINE TERMINAL IN GIGABIT PASSIVE OPTICAL NETWORK AND METHOD FOR TRANSMITTING BROADCAST FRAME USING THE SAME - Disclosed are an optical line terminal in a gigabit passive optical network and a method for transmitting a broadcast frame using the same. The optical line terminal allocates second port identifiers to optical network units such that a broadcast frame is prevented from being retransmitted to an optical network unit which has transmitted the broadcast frame to the optical line terminal. | 06-03-2010 |
| 20100135665 | BURST MODE OPTICAL REPEATER - A burst mode optical repeater is provided. The burst mode optical repeater receives optical signals, which are transmitted from a plurality of optical network units (ONUs) in a passive optical network (PON) to a central office using a time division multiplexing access (TDMA) method, and relays the received optical signals using an optical-electrical-optical (OEO) method. Since the burst mode optical repeater can be installed anywhere between an optical line terminal (OLT) and the ONUs, the number of subscribers and transmission range that can be supported by a corresponding network can be increased. | 06-03-2010 |
| 20100135666 | CLOCK PHASE ALIGNING APPARATUS FOR BURST-MODE DATA - Disclosed is a clock phase aligning apparatus capable of synchronizing a clock signal in the middle of an upstream burst mode data bit in an optical line terminal of a passive optical network. The clock phase aligning apparatus effectively aligns a phase of a clock signal with a phase of data during an overhead period of burst mode packet data through an over-sampling scheme and a digital scheme. Burst mode data signals are subject to an over-sampling through a high speed continuous mode analog circuit and then converted into low speed parallel signals through a parallel conversion unit. Such low speed parallel signals are processed with respect to sampling patterns through a digital look-up scheme in a logic circuit device such that the phase of data is arranged with the phase of a clock signal during a limited bit stream specified in a burst mode preamble timing. | 06-03-2010 |
| 20100221006 | APPARATUS AND METHOD FOR EFFICIENT BANDWIDTH ALLOCATION ON TIME DIVISION MULTIPLE ACCESS-BASED PASSIVE OPTICAL NETWORK (TDMA-PON) - Provided are an apparatus and method for efficiently and dynamically allocating a bandwidth on a Time Division Multiple Access-based Passive Optical Network (TDMA PON). The dynamic bandwidth allocation apparatus for uplink data transmission of a plurality of Optical Network Units (ONUs) including a plurality of class queues corresponding to Transmission Container (T-CONT) types, the plurality of ONUs connected to an Optical Line Terminal (OLT) on a Passive Optical Network (PON), includes: a class queue information storage unit storing information regarding a bandwidth allocation period and an allocatable bandwidth amount for each T-CONT type; an allocation check table unit checking the bandwidth allocation period for the T-CONT type received from the class queue information storage unit, and determining an allocatable bandwidth amount for the T-CONT type; and a bandwidth allocation unit allocating an uplink bandwidth to the T-CONT type with reference to the bandwidth allocation period and the allocatable bandwidth amount for the T-CONT type, and re-allocating to each ONU an uplink bandwidth remaining after allocating a total uplink bandwidths to all T-CONT types. | 09-02-2010 |
| 20100260498 | OPTICAL NETWORK TERMINAL OF THE GIGABIT PASSIVE OPTICAL NETWORK AND FRAME TREATMENT METHOD OF THE ONT - A gigabit passive optical network (GPON) system for fiber to the home (FTTH) service must provide a down-stream data rate of an optical band to provide IPTV service with hundreds of channels to subscribers, and must be able to provide an upstream data rate of an optical band using a currently available BM-IC chip. A currently available BM-IC chip for a GPON has 1.244 Gbps and 2.488 Gbps modes. Accordingly, an optical network terminal (ONT) for a GPON that is capable of providing a downstream transmission band of 10-Gbps and an upstream transmission band of 1.244 Gbps or 2.488 Gbps, and a method for processing an upstream frame in the terminal, are provided. The GPON ONT can provide 20 Mbps, high-definition IPTV service with 500 channels and can provide both upstream data rates of 1.244 Gbps and 2.488 Gbps according to a user's selection without using an additional device. | 10-14-2010 |
| 20100272259 | METHOD FOR FILTERING OF ABNORMAL ONT WITH SAME SERIAL NUMBER IN A GPON SYSTEM - Disclosed is a method of registering only an authorized optical network terminal among a plurality of optical network terminals with the same serial number, in an optical line terminal, using a public key encryption algorithm, in a Gigabit Passive Optical Network (GPON). According to an exemplary aspect, a GPON system encrypts a physical layer OAM message transmitted/received for serial number registration of an optical network terminal, using a key distributed according to a public key encryption algorithm, and authenticates registration of the optical network terminal using the encrypted physical layer OAM message. Accordingly, it is possible to securely authenticate registration of an authorized optical network terminal and block registration of unauthorized optical network terminals. | 10-28-2010 |
| 20110129235 | BURST-MODE OPTICAL SIGNAL RECEIVER - A burst-mode optical receiver is provided. The burst-mode optical receiver includes a preamplifier, a post-amplifier integrated into one body together with the preamplifier, and an operation controller for controlling operation of the preamplifier and the post-amplifier using an external reset signal input from a single external reset input terminal. As a result, it is possible to implement a burst-mode receiver for a gigabit-capable passive optical network (GPON) in which a preamplifier unit and a post-amplifier unit are integrated. | 06-02-2011 |
| 20120045210 | OPTICAL SUBSCRIBER NETWORK - An optical subscriber network for power reduction is provided. The optical subscriber network may include an Optical Line Terminal (OLT) and an Optical Network Terminal (ONT). The OLT may manage a plurality of ONTs by classifying the plurality of ONTs into a sleep group, and may multicast a sleep allowance message only to ONTs included in a predetermined sleep group. | 02-23-2012 |
