Abstract:
본 발명은 보안 방법 및 장치에 관한 것으로서, 더욱 상세하게는 NAN(Neighborhood Area Network)에서 이웃 검색을 이용하여 네트워크 보안을 하는 시스템 및 방법에 관한 것이다. 본 발명의 일 실시예에 따른 NAN에서의 이웃 검색을 이용한 네트워크 보안 시스템은 소정의 부모 노드를 통하여 새로운 클러스터로 접근하는 접속 노드; 및 상기 접속 노드에 이웃 검색 요청을 송신하여 상기 접속 노드로부터 이웃 검색에 의하여 생성된 확장 ACL 프레임을 수신하는 코디네이터를 포함하며, 상기 확장 ACL 프레임은 상기 접속 노드와 한 홉 이내의 이웃 노드들을 나타내는 이웃 리스트 필드; 및 상기 이웃 노드들에게 각각 할당된 무선 자원의 시간 정보를 나타내는 이웃노드 타임 스탬프 필드를 포함한다. 이웃 검색, NAN, 클러스터 구조
Abstract:
PURPOSE: An underwater node installation device is provided to transmit various data obtained underwater to the surface of water by the underwater installation of nodes. CONSTITUTION: An underwater node installation device comprises a housing(10), an anchor(30), and a connecting member(40). The housing forms an upper housing part(12) and a lower housing part(14). The upper housing part comprises a horizontal flange(12'). The upper housing part and the lower housing part are hemi-spherical. The lower housing part comprises a horizontal flange. As sealing is interposed between each horizontal flange of the upper housing part and the lower housing part, the upper housing part and the lower housing part are coupled. The housing is formed with an inner space for mounting components. An anchor is mounted on the underwater ground. The connecting member interlinks the housing and the anchor. The housing is formed with a horizontal installation part(20) and a sensor connection part(22).
Abstract:
A wireless data transmitting method and a medium recording a program for the same are provided to increase efficiency of the network by minimally decreasing the number of data transmission times and to reduce power consumption. A wireless data transmitting method at a transmitter connected with a receiver through the communication network is composed of steps for judging whether the size of a data frame stored in a queue is over a preset minimum size value or not in transmitting the data frame(1010); adding an initiation field to the data frame to be transmitted for the next time, if the size of the data frame is over the preset minimum size value; and transmitting the data frame additionally including the initiation field, to the receiver(1020).
Abstract:
PURPOSE: A transmission method is provided to reduce energy consumption by reducing the length, transmission number, and transmission time of a packet in a wireless communication system. CONSTITUTION: Packets are individually transmitted from a plurality of sensor nodes to a master node(S201). A response packet is generated. The generated response packet is broadcasted to a plurality of the sensor nodes. The response packet is received from a plurality of the sensor nodes(S215). It is confirmed whether the packet is transmitted from a plurality of the sensor node to the master node by confirming node ID(Identification) information and transmission type information included in the received response packet(S217). [Reference numerals] (AA) Start; (BB) End; (S201) Transmitting packets from a plurality of sensor nodes to a master node; (S203) Receiving the packets in the master node; (S205) Confirming the packets in the master node; (S207) Normal packet?; (S209) Generating a response packet containing ACK/NAK transmission type information and node ID information and transmitting to a plurality of sensor nodes; (S211) Block packet?; (S213) Generating a response packet containing Block ACK/NAK transmission type information and node ID information and transmitting to a plurality of sensor nodes; (S215) Receiving the response packet in a plurality of sensor nodes; (S217) Confirming the transmission success of the packet
Abstract:
PURPOSE: A communication protocol for underwater environment and network forming method using the same are provided to add a preamble section in which a sync node broadcasts in a MAC(Medium Access Control) protocol. CONSTITUTION: A network topology performs a maintenance/repair operation in a superframe section(20). An inter-node data is transceived in the superframe section. A channel state is measured between a sync node and a sensor node in a preamble section. A sensor node is determined in a configuration section(14). The network topology is formed in the configuration section. Time synchronization is performed between the sensor node and the sync node in a synchronization section(16).
Abstract:
본 발명은 마스터와 슬레이브 간의 데이터 전송방법 및 장치에 관한 것이다. 본 발명은 마스터(100)와 슬레이브(200) 상호 간에 SPI(Serial Peripheral Interface) 규격에 의한 핀 구성 이외에 슬레이브(200)가 마스터(100)에게 전송할 데이터가 있음을 알리는 외부 핀을 추가로 구성한다. 외부 핀은 마스터(100)와 슬레이브(200)에 각각 구비되고 서로 연결된다. 그런 상태에서 슬레이브(200)가 데이터 전송준비를 완료하면 외부 핀을 로우레벨 상태로 설정한다. 로우레벨 상태는 데이터 송수신이 가능한 상태를 말한다. 마스터(100)는 외부 핀 상태를 감시하다가 슬레이브(200)의 외부 핀이 로우레벨로 설정되면, 클럭핀(SCK)을 통해 소정 주파수의 클럭신호를 슬레이브(200)에게 발생한다. 이에 슬레이브(200)는 클럭신호에 따라 상기 마스터(100)에게 데이터를 전송한다. 슬레이브(200)는 데이터 전송을 완료하면, 상기 마스터(100)에게 데이터 전송이 완료되었음을 통보하기 위해 상기 외부 핀을 하이레벨 상태로 설정한다. 이와 같은 본 발명에 따르면, 마스터가 슬레이브로부터 수신할 데이터 유무를 확인할 필요가 없기 때문에 데이터의 오버헤드를 감소시키는 이점이 있다. 마스터, 슬레이브, SPI, 외부 핀
Abstract:
PURPOSE: A method and a device for transmitting data between a master and a slave are provided to transmit presence of transmission data in the salve when the slaver has the transmission data for the master, thereby reducing overhead of data. CONSTITUTION: A data transmitting device comprises a master(100), a slave(200), and an SPI(Serial Peripheral Interface) unit. The master controls data communication of a sensor node in a wireless sensor network. The slave transmits data according to a control operation of the master. The SPI unit is connected between the master and the slave. The SPI interface unit transceives data between the master and the slave in a serial transmission type.
Abstract:
A system and method for estimating the location of a mobile node based on snooping node using a received signal strength indication are provided to block an unnecessary operation with a coordinator in another indoor space. In the separated indoor space, a location of a mobile node is located based on a correction node(400) with presumption, and a mobile node(200) is determined whether it is moved from a second indoor space to a first indoor space. The mobile node receives a signal from a plurality of fixed nodes(100) and a plurality of data of each fixed node is obtained. A plurality of data of the obtained each fixed node is received from the mobile node. The representative received signal strength of each fixed node is produced by using a plurality of data of each fixed node.
Abstract:
A method for estimating a location by using received signal strength on a sensor network and a system thereof are provided to enhance accuracy of location estimate by amending received signal strength with confidence. A method for estimating a location by using received signal strength on a sensor network includes the following steps of: acquiring a plurality of data about each fixing node and detecting the received signal strength(S1000); generating a confidence population about each fixing node from the data(S1020); calculating a central value about each fixing node(S1030); and estimating a relative position from each fixing node by using the measured central value(S1040).
Abstract:
본 발명은 수중환경에서 주기적 데이터 및 비주기적 데이터의 통합 통신방법 및 시스템에 관한 것이다. 본 발명의 통합 통신시스템은 수중통신 프로토콜의 비콘구간에서 자신이 속한 클러스터 내 다수의 다른 노드로 비콘 메시지를 브로드캐스팅하고 상기 수중통신 프로토콜의 경쟁구간에서 상기 다수의 다른 노드로 비주기적으로 제어 데이터를 전송하는 싱크노드; 및 상기 비콘 메시지를 수신하여 상기 비콘 메시지에 포함된 자신에게 각각 할당된 데이터 전송시간을 확인하고 상기 수중통신 프로토콜의 비경쟁구간에서 상기 할당된 데이터 전송시간에 따라 미리 수집한 수중정보 수집 데이터를 상기 싱크노드로 주기적으로 전송하는 다수의 센서노드를 포함한다.