Abstract:
PURPOSE: A sensor node based on asynchronous MAC protocol and a data transceiving method performed in the sensor node are provided to solve problems such as data transmitting delay reduction, overhead reduction due to time synchronization and battery consumption amount reduction. CONSTITUTION: A main transceiver(412) transceives data. A wake-up RF module(413) converts state of a node. An MCU(Micro Control Units)(411) transmits a wake-up frame to at least one receiving node through the wake-up RF module. The MCU receives the wake-up frame. The MCU transmits data to an activated receiving node through the main transceiver.
Abstract:
PURPOSE: A multi-antenna matching operation and DMA based data transmitting method and a sink node therefor in sensor network performing an intermediating function about a plurality of transcievers connected within a sink node to SPI bus are provided to remove bottleneck when transmitting data by transmitting the sink node based on DMA. CONSTITUTION: A sink node implements data transmission through a DMA channel of a micro controller(300). A DMA controller(307) implements DMA control function for transmitting data about plural antenna structures at high speed. An SPI bus controller(308) controls SPI signal about reception data of plural wireless transceiving elements. A transceiver(309) is connected through the SPI bus control and SPI serial bus.
Abstract:
애드 혹(ad-hoc) 네트워크 내 노드를 위한 자원 할당 방법 및 장치가 개시된다. 본 발명에 따르면, 애드 혹 네트워크 내의 하나의 노드에 있어서 일정 개수의 타임 슬롯들을 포함하는 기본 프레임 구조를 저장하고, 라우팅 경로에서의 그 노드의 패스 시퀀스 넘버(path sequence number)를 기초로 일정 개수의 타임 슬롯들 중 시작 타임 슬롯을 결정하며, 순환되는 기본 프레임 구조에서 시작 타임 슬롯부터 일정 개수의 타임 슬롯들을 포함하는 프레임 구조를 그 노드의 통신 프레임 구조로 결정한다. 이로써 애드 혹 네트워크 내의 노드에 대하여 타임 슬롯을 할당하는데 들던 추가적인 자원과 시간을 최소화할 수 있다. 애드 혹 네트워크, 무선 멀티홉 네트워크, 멀티 홉 환경 간섭, 타임 슬롯 할당
Abstract:
곡면 탄성판을 이용한 발전모듈 및 압전에너지 수집장치가 개시된다. 전기를 발생하는 기본 단위인 본 발명에 따른 발전모듈은 물체에 연결되거나 진동 시스템에서 질량체로서 작용하는 두 개의 관성블록을 포함하고, 두 개의 관성블록을 연결하는 탄성이 있는 곡면의 판으로 구성된 곡면 탄성판을 포함하고, 곡면 탄성판의 두면 중 적어도 하나의 면에 접착되는 압전필름을 포함한다. 또한, 압전 에너지 수집장치는 발전모듈을 소정의 연결블록을 통해 다수 개 연결함으로써 비교적 많은 양의 전기를 생성할 수 있다. 곡면 탄성판, 압전필름
Abstract:
본 발명에 의한 무선 센서 네트워크에서의 라우팅 및 자원 할당 방법은 복수의 센서 노드가 클러스터를 구성하고 그 클러스터를 대표하는 클러스터 헤드를 선출하는 단계; 상기 클러스터 헤드와 센서 노드간의 라우팅(routing) 경로를 선정하는 단계; 네트워크의 구성요소 및 분포 방식과 상기 라우팅 경로를 기초로 프레임 길이를 선정하는 단계; 상기 클러스터 헤드간에 통신을 위한 타임 슬롯 자원할당표를 구성하는 단계; 및 상기 타임 슬롯 자원할당표를 1홉 거리만큼 떨어진 클러스터 헤드간에 상호 교환하는 단계;를 포함하는 것을 특징으로 하며, 무선 센서 네트워크에서 효과적으로 라우팅 경로를 설정하고 다양한 데이터 요구를 충족시킬 수 있도록 자원을 할당함으로써 무선 센서 네트워크의 신뢰성과 서비스 품질을 향상시키는 효과가 있다. 무선 센서 네트워크, 라우팅, 서비스 품질(QoS), 다중 경로, 멀티 홉 환경 간섭, 타임 슬롯 할당
Abstract:
Provided is a method for communication with between readers having dual sensitivity modes for avoiding conflict between readers arising from interference each other when simultaneously used in a limited space. The method for communication between a tag and a reader using dual sensitivity modes for avoiding conflict between the reader and the tag includes: initializing the reader to a normal sensitivity mode; temporarily selecting a frequency channel by the reader; checking whether or not a different reader uses the selected frequency channel; repeatedly selecting another frequency channel if the other readers occupy the selected frequency channel; switching to a reduced sensitivity mode if the other readers do not occupy the selected frequency channel; and communicating with the tag by the reader in the reduced sensitivity mode.
Abstract:
Provided are a transmitting apparatus, a transmitting method, a receiving apparatus, a receiving method and a channel status information updating method of a sensor node based on multiple channels. The transmitting apparatus and method transmit a wake-up signal for switching neighbor nodes in a power-saving mode in a transmission range of the sensor node to a wake-up mode in which the neighbor nodes wait to receive a message from the sensor node through the control channel, transmit a preamble message including a list of unused available channels from among the data channels to a receiving node to which data is transmitted from among the neighbor nodes through the control channel, receive an acknowledgement message including information that indicates a channel selected from the available channels from the receiving node through the control channel, transmit a connection confirmation message for switching neighbor nodes other than the receiving node to the power-saving mode through the control channel, and transmit data to the receiving node through the selected channel.
Abstract:
A generator module and a piezoelectric energy collecting device are provided to amplify the action of objects through a film-type piezoelectric element and a curved elastic plate and collect it to produce electricity. A generator module comprises a first inertia block attached to an object, a second inertia block working as a mass in a vibration system, a curved elastic plate(2) whose both ends are connected to the first and second inertia blocks(1), and a piezoelectric film(3) attached to one or both of the sides of the curved elastic plate. The curved elastic plates are located between the first and second inertia blocks so that the curved side faces outside.
Abstract:
A transmission device of a sensor node based on multi-channels using a wakeup signal, a transmission method, a transmission device and a channel state information update method are provided to improve the reliability and performance and extend the life time of network. A wakeup signal transmitter(110) transmits wakeup signal. A preamble transmitter(120) transmits a preamble message to a receiving node delivering data among adjacent nodes. A receive acknowledgement message receiver(130) receives the receive acknowledgement message. A connection confirm message transmitter transmits the connection confirm message. A connection confirming message converts adjacent nodes except for the receiving node into the power saving state. A data transmitter transmits data in the receiving node.
Abstract:
A USN protocol analysis device for using an XML schema is provided to analyze a plurality of channels and analyze various protocols about XML by analyzing the protocol by using the USN protocols. A packet analyzer(100) collects a packet which communications with sensor nodes of USN(Ubiquitous Sensor Network) through a channel. A protocol analyzer(110) uses XML(eXensible Markup Language) schema defined according to USN protocol by processing the collected packet. The packet analysis unit includes a transceiver. The packet is collected by using the transceiver.