Abstract:
PURPOSE: An apparatus and a method for eliminating an interference signal out of a band are provided to realize small insertion loss, thereby improving receiving sensitivity while removing an interference signal out of a band. CONSTITUTION: The first mixer(130) performs frequency down shift about a receiving signal including an interference signal out of a band. A filter unit(140) extracts an interference signal out of a and which is down-shifted from the receiving signal which is down-shifted. The second mixer(150) up-shifts the interference signal out of a band which is down-shifted. The interference signal out of a band is returned back to an original frequency band. An operating unit(160) eliminates the returned interference signal out of a band.
Abstract:
PURPOSE: A digital IF wireless transmitter, a RF modulator and a modulating method are provided to enhance the effectiveness and linearity of an intermediate frequency modulation using a high frequency modulation mode for a digital intermediate frequency radio transmitter. CONSTITUTION: An intermediate frequency up converter(110) up-converts an I signal and a Q signal of the base band. A first operation unit(120) subtracts the I signal and the Q signal. A DA converter(130) changes the output of the first operation unit. The intermediate frequency modulator respectively modulates the first and second signals separated from the output of the DA converter. A high pass filter part passes the single-side band of the first signal. The mismatch calibration part compensates the error of the second signal. The second operation unit subtracts the output of the high pass filter part and the output of the mismatch calibration part. A feedback unit extracts the error from the output of the second operation unit. The RF up converter up-converts the output of the second operation unit.
Abstract:
A wireless communications system and a communications method thereof for reducing power consumption are provided to measure signal intensity by each channel received from each wireless communications device. Wireless communications devices(10a~10n) perform a specific application at a remote place. The channel state information is successively transmitted from the wireless communications devices to the wireless channel controller. The wireless channel controller performs the wireless telecommunication to the wireless communications device and specific frequency band. The wireless channel controller receives the channel state information at the fixed cycle interval from the wireless communications device. The mean value about the received channel state information is calculated.
Abstract:
An apparatus and a method for controlling a wireless sensor network based on packet monitoring and a computer-readable medium recording a program for implementing the same are provided to recognize the structure of a data packet broadcasted in each node, analyze the data packet, and detect an abnormal pattern, thereby easily monitoring hacking or invasion for each node within the wireless sensor network. A data communication interface unit(210) receives packet data broadcasted on a wireless sensor network having plural sensor nodes(100). A packet data analysis unit(220) analyzes the packet data received from the data communication interface unit. A pattern data storage unit(230) stores pattern data for an abnormal context. An abnormal context determination unit(240) determines the abnormal context of the wireless sensor network on the basis of the analysis determination of the packet data or the pattern data. The wireless sensor network supports zigbee standards. The packet data analysis unit inspects the sequence number of the zigbee standards for the packet data. The abnormal context determination unit determines that the wireless sensor network is in an abnormal state when the sequence number is abnormal.
Abstract:
V2I 통신에서 단일채널 기반의 다중 IP를 이용한 데이터 전송방법이 개시된다. 일 실시예에 따른 데이터 전송방법은 단일채널을 통해 CCH(Control Channel) 서비스 및 SCH(Service Channel)서비스를 제공할 수 있도록 CCH IP 및 SCH IP를 설정하고, 상기 설정된 IP 정보를 차량단말기에 전송하고, 상기 전송된 IP를 이용하여 차량단말기와 차량기지국 간에 V2I 통신을 수행하는 과정을 포함한다. 본 발명에 따르면 메시지 및 데이터의 신뢰성과 전송효율을 향상시킬 수 있다.
Abstract:
PURPOSE: A frequency selective surface unit cell and a device for suppressing surface wave are provided to efficiently suppress a surface wave by attaching a surface wave suppressor of a unit cell to a ground side. CONSTITUTION: In a frequency selective surface unit cell and a device for suppressing surface wave, a frequency selective surface unit cell comprises a first dielectric layer(120) and a second dielectric layer(110) The first dielectric layer has the bottom side contacting to the ground side and the top side contacting to the second dielectric layer. The second dielectric layer and the first dielectric layer are laminated. A resonator(111) has a part of a folded metallic part which is opposite to the surface of the second dielectric layer.
Abstract:
본 발명은 센서 네트워크를 이용하여 세탁기의 작동 상태를 수신하고, 상기 세탁기를 원격으로 제어함으로써 별도의 배선이나 서버 없이도 세탁기를 제어할 수 있는 세탁기 작동 상태 모니터링 및 원격 제어 장치 및 방법에 관한 것이다. 본 발명에 따른 탁기 작동 상태 모니터링 및 원격 제어 장치는 세탁기에 설치되어 상기 세탁기의 작동 상태에 관한 정보를 전송하는 제1 센서 노드; 상기 제1 센서 노드와 센서 네트워크를 형성하며, 상기 제1 센서 노드가 전송하는 세탁기의 작동 상태에 관한 정보를 중계하는 하나 이상의 제2 센서 노드; 및 상기 센서 네트워크로부터 상기 세탁기의 작동 상태에 관한 정보를 수신하여 상기 정보를 사용자에게 제공하고 상기 사용자의 요청에 따라 상기 세탁기를 원격으로 제어하는 원격 제어 장치를 포함하는 것을 특징으로 한다.
Abstract:
본 발명은 센서 네트워크를 이용하여 시각 장애인이 용이하게 보행자 신호를 제어하고 상기 보행자 신호에 따라 도로를 횡단할 수 있는 시각 장애인용 신호등 시스템 및 이를 이용한 신호등 제어 방법에 관한 것이다. 본 발명에 따른 시각 장애인용 신호등 시스템은 보행자 신호등에 설치되어 상기 신호등의 점등을 제어하며, 상기 신호등의 점등 상태를 전송하는 제1 센서 네트워크 노드; 및 시각 장애인의 제어에 따라 상기 신호등의 점등을 요청하는 신호를 상기 제1 센서 네트워크 노드로 전송하며, 상기 신호등의 점등 상태를 수신하여 상기 시각 장애인에게 통보하는 제2 센서 네트워크 노드를 포함하되, 상기 제1 센서 네트워크 노드와 상기 제2 센서 네트워크 노드의 통신은 RF 통신을 포함하는 것이고, 상기 제1 센서 네트워크 노드의 상기 신호등의 점등 상태의 전송은 브로드캐스트 또는 유니캐스트 전송 방식을 포함하는 것을 특징으로 한다.
Abstract:
A system and a method for monitoring and remote controlling operation of a washing machine are provided to control the washing machine without using a additional server or wiring system. A system for monitoring and remote controlling operation of a washing machine comprises a first sensor node(SN1), at least one second sensor node(SN2,SN5), and a remote controlling unit. The first sensor node is installed at the washing machine and sends information of operation state of the washing machine. The second sensor node forms a sensor network with the first sensor node, and relays information of the washing machine. The remote controlling unit receives operation information of the washing machine from the sensor network, and remotely controls the washing machine according to the request of users.
Abstract:
A signal lamp system for the visually handicapped and a method for controlling a signal lamp are provided to raise a safety level for the visually handicapped by controlling a pedestrian signal. A signal lamp system for the visually handicapped includes first and second sensor network nodes(100,200). The first sensor network node is implemented at a signal lamp to control the signal lamp. The first sensor network node transmits a turn-on state of the signal lamp. The second sensor network node transmits a control request signal from the visually handicapped to the first sensor network node and receives the turn-on state of the signal lamp. The second sensor network node notifies the visually handicapped of the turn-on state of the signal lamp. The first and second sensor network nodes communicate with each other by using an RF(Radio Frequency) communication scheme.