Abstract:
An optical communication system is provided to minimize the signal degradation and cross talk which are generated due to the dispersion and non-linearity of an optical fiber by phase-modulating and transmitting data of half-frequency. An optical communication system comprises the followings: an optical fiber(130) which transmits an optical signal phase-modulated in an optical transmitter(110) to a photo receiver(120); and the photo receiver which frequency-multiplies the received optical signal to detect data, and includes a time delay interferometer(121), the first optical detector(122a), the second optical detector(122b) and a differential amplifier(123). The time delay interferometer generates the first and second optical signals from the received optical signal. The first optical detector photo-electrically converts the first optical signal into the first electrical signal. The second optical detector photo-electrically converts the second optical signal into the second electric signal. The differential amplifier differentially amplifies the first and second electrical signals received from each optical detector.
Abstract:
An ink jet printing system is provided to improve the yield of color filter production, and improve the printing performance. A substrate is mounted on a stage(200). An image capture part captures the image of the injected ink on the pixel region of substrate and provides the image signal. A control part(306) supplies gradation signal expressing the gradation difference of each coordinates. A spray amount control part generates a spray amount control signal by the coordinates signal and gradient signal. An inkjet head part sprays again to the ink shortage domain of the substrate surface according to the spray amount control signal.
Abstract:
A liquid crystal display device is provided to improve the side yellowish phenomenon and bottom side gradation reversion phenomenon. A first and a second gate line(121n,121p) which mutually neighbors are formed on a first substrate. A sustain electrode line(131) is formed on the same layer as the first and the second gate line. A first and a second thin film transistor are connected to the first gate line. A third thin film transistor including the drain electrode is connected to the second gate line. A data line(171) is connected with the first thin film transistor and the second thin film transistor. A first sub pixel electrode is electrically connected with the first and the third TFT. A first alignment layer is scrubbed to the first direction while being formed on the pixel electrode. A second alignment layer is scrubbed to the backward which is the reverse direction of the first direction while being formed on the common electrode.
Abstract:
A washing machine and a method for controlling the same are provided to prevent damage to laundry by displaying a help message about a washing process for helping a user while driving the washing machine. A method for controlling a washing machine comprises the steps of: judging whether a help message providing command is inputted from a help message input unit(S209); and displaying a detailed help message on a display while operating the washing machine if the help message providing command is inputted(S210).
Abstract:
A display panel is provided to define an up capacitor by crossing a prolongation unit and a protrusion pattern, thereby reducing a process error of a manufacturing process and designing the up capacitor more stably. A substrate has plural gate lines(GLn,GLn+1) and plural data lines(DLm-1,DLm,DLm+1). The data lines define plural pixel areas by crossing the gate lines. The pixel area comprises a main pixel area and a sub pixel area adjacent to the main pixel area. A first TFT(Thin Film Transistor)(T1) is formed on the substrate, and is connected to a current gate line and a current data line. A second TFT(T2) is formed on the substrate, and is connected to the current gate line and the current data line. A main pixel electrode(MP) is installed in the main pixel area, and electrically connected to a drain electrode(DE1) of the first TFT. In the main pixel electrode, a protrusion pattern is formed in an end portion adjacent to the next gate line. A sub pixel electrode(SP) is installed in the sub pixel area, and is electrically insulated form the main pixel electrode. The sub pixel electrode is electrically connected to a drain electrode(DE2) of the second TFT. A third TFT(T3) comprises a gate electrode branched from the next gate line, a first electrode(E1) electrically connected to the sub pixel electrode, and a second electrode(E2) crossing the protrusion pattern of the main pixel electrode.
Abstract:
A method and a system for managing energy in the sensor network environment by using the spanning tree are provided to equalize the energy use of sensor nodes distributed in a sensor network. A base station collects the remaining amount of nodes according to the constant period(S201). The number of links for connecting the nodes by clusters is arranged(S202). The degree of the maximum permission link of nodes is determined(S203). A spanning tree is updated on the basis of the degree of the maximum permission link(S204). The constant period for updating the spanning tree is set. An amount of energy that another node is added to the specific node is calculated during the constant period. The constant period is a round period that the node transmits the data to the base station. The entire lifetime of the sensor network is divided by the constant segments so that another period is formed.
Abstract:
An apparatus for monitoring an optical fiber link is provided to measure the length of an optical fiber more precisely by using inspection light rather than reflective light. An apparatus for monitoring an optical fiber link includes a first node(210) and a second node(250), which are connected by an optical fiber link(290). The first node includes an optical transmitter(220), a first optical fiber link monitoring device(230), and a first multiplexer(240). The second node includes an optical receiver(270), a second optical fiber link monitoring device(280), and a second multiplexer(260). Each of the first and second optical fiber link monitoring devices comprises a transmitting part(234,284), a receiving part(236,286), an optical distributor(238,288), and a processor(232,282).
Abstract:
본 발명은 시분할 듀플렉싱 방식의 이동통신 시스템에서 무선 상하향 신호를 송수신하기 위한 무선광섬유 링크 장치에 관한 것이다. 본 발명의 시분할 듀플렉싱 방식 무선광섬유 링크 장치는 이동통신 시스템의 기지국으로부터 무선주파수 신호를 수신하고, 상기 시분할 듀플렉싱 신호의 스위칭에 따라 바이어스 제어되어 상기 무선주파수 신호를 광신호로 변조하는 제1 전광변환부를 구비하는 중앙기지국과; 상기 중앙기지국으로부터 광섬유를 통해 전송되는 상기 광신호를 무선주파수 신호로 변환하는 제1 광전변환부를 구비하며, 상기 무선주파수 신호를 안테나를 통해 이동통신 단말로 전송하는 중계기의 리모트를 포함함을 특징으로 한다. 시분할 듀플렉싱, 무선광섬유, 바이어스
Abstract:
A network traffic distribution method and a network system using the same are provided to open or close a port selectively according to the amount of network traffics, thereby scattering traffic concentration in a network. A network traffic distribution method comprises the following steps. A bridge checks the amount of traffics and confirms whether the checked traffic amount is bigger than a predetermined value(S101,S102). If so, it is confirmed whether a frame is transmitted from an edge port formed to be directly connected to the bridge(S103). If so, the frame is outputted to a substitution port(S104).
Abstract:
A symbol error rate-based adaptive power allocation scheme for OSTBC and beam forming in a DWCS is provided to estimate large-scale fading and nakagami fading parameters in a transmitter, thereby minimizing the SER of MQAM(M-ary Quadrature Amplitude Modulation) and MPSK(M-ary Phase Shift Keying) symbols. A adaptive power allocation scheme for OSTBC(Orthogonal Space Time Block Codes) and beam forming in a DWCS(Distributed Wireless Communication System) comprises the following steps of: setting i to one, A to Ai, and P and P0 to one, wherein A is the optimal antenna sub set, and P is a quasi or optimal SER(Symbol Error Rate)(401); estimating DOA(Direction Of Arrival) for each sub array and generating an array response vector for the each antenna sub array(402); calculating a quasi or optimal SER Pi for the sub set Ai by using quasi and optimal power allocation schemes, PAS1(Power Allocation Scheme1) and PAS2(403); checking whether the calculated SER Pi is less than or equal to Pi-1(404); setting A to Ai and P to Pi if the Pi is less than or equal to Pi-1(405); checking whether I is less than 2^l-1(406); and adding one to i when I is less than 2^l-1(407).