Abstract:
PURPOSE: An adaptable relay communication method for an UWB(Ultra-WideBand) link is provided to improve QoS(Quality of Service) and reception rates by reserving relay resources according to a QoS standard. CONSTITUTION: When a MAS(Medium Access Slot) is able to reserve S-R and MAS R-T, a reservation host node transmits a relay acceptance reservation code for the MAS R-T to a reservation target node, a relay request reservation reason code to a relay node, and a relay notification reservation reason code to the reservation target node. When the relay acceptance reservation code is received from the relay node and the reservation target node, the reservation host node transmits data through the relay node.
Abstract:
PURPOSE: A query processing system for supporting variable packet transmission in a wireless sensor network is provided to minimize energy consumption in a sensor node by controlling packets of a transmission message according to an attribute of the packets. CONSTITUTION: A sensor node(300) receives a query message from a base node. The sensor node collects environment data according to a query received in the query message. The sensor node generates a response message including the environment data. The sensor node generates the response message by changing a payload size of the response message packet according to attribute information included in the query message. The sensor node transmits the generated response message to the base node. [Reference numerals] (100) Host PC; (200) Base node; (300) Sensor node; (AA) Transmitting a query written in a Tiny DB to the base node; (BB) Transmitting the query to a corresponding node; (C1) Writing Query, and using API; (C2) Transmitting attributes to assigned nodes by selecting identification Group ID and Node ID; (C3) Writing the query to be convenient and comprehensible for a user using a Tiny DB application program; (C4) Possibly confirming by plotting a graph of data using the API; (DD,GG) Transmitting the query; (EE,HH) Transmitting the data; (F1) Transmitting the Query, and collecting data from each node; (F2) Transmitting the written query to corresponding nodes; (F3) Collecting transmitted data, and transmitting to a PC; (I1) Acquiring the Query, and transmitting the data; (I2) Installing an application to be used; (I3) Receiving the query through the base node; (I4) Acquiring the data of the attribute which is received by query; (I5) Transmitting data acquired from the real world to a BS node; (JJ) Transmitting the data to the PC; (KK) Transmitting the data to the base node according to a variable message format
Abstract:
PURPOSE: A ship sensor network and an effective data merging method are provided to increase the lifetime of a network by reducing the amount of data transmission. CONSTITUTION: A plurality of sensor nodes(1-3) compares a collected average value of a data value with a current data value which is periodically collected. The plurality of the sensor nodes transmits the current data to a cluster head(10) when the current data value is over the average value. The cluster head transmits an average value of a data value transmitted from a plurality of the sensor nodes to a synchronization node(20). The synchronization node transmits the average value transmitted from the cluster head to an upper analysis system. [Reference numerals] (20) Synchronization node; (AA) Legend; (BB) Sensor node; (CC) Cluster head
Abstract:
PURPOSE: An RIO(Random Early Detection with in and Out) method and an RIO-DC(DeCoupled) method are provided to evaluate buffer management methods of AF(Assured Forwarding) PHB(Per Hop Behavior) by comparing a performance between the RIO method and the RIO-DC method. CONSTITUTION: Average transmission rates required by a user are confirmed. A predetermined bandwidth is allocated in each sub-class of a guarantee type service for the confirmed average transmission rate by dividing delay time according to traffic information in each flow. A variable value is set based on a buffer size determined according to a bandwidth rate in a network topology and each sub-class of the guarantee type service.
Abstract:
PURPOSE: A fairness improving method is provided to improve link usage rates by improving fairness between TCP(Transmission Control Protocol) flows in a single domain and a multi-domain environment. CONSTITUTION: The yield fairness of an individual flow is improved in an integrated traffic management method in a differentiated service for a network in a ship. A TCP user uses AS(Assured Service) without managing user flows. The yield and the link usage rate are improved in a minimum bandwidth, a surplus bandwidth, and bandwidth shortage. The improvement of the yield fairness and the link use rate is confirmed in the improved single domain environment and the multi-domain environment.
Abstract:
PURPOSE: A space time coding OFDM(Orthogonal Frequency Division Multiplexing) based low complexity multiple antenna relay transmitting method is provided to increase diversity gain by using a relay mode, an antenna selection mode, or a circulation delay diversity mode. CONSTITUTION: A signal transmitted to a first timeslot from a source node(100) is received by a multiple receiving antenna. An amplification gain is determined in consideration of average transmission power of each receiving signal. An LC-STBC(Linear Combining-Space-Time Block Coding) signal processing of each receiving signal is performed. The processed signal is amplified as the amplifying gain. The amplified signal is transmitted to a target node(300) through multiple transmission antenna. [Reference numerals] (100) Source node; (300) Target node
Abstract:
본 발명은 선박 등의 이동체에 적용할 수 있는 태양 추적 방법에 관한 것으로, 보다 구체적으로는 태양광 발전 시스템을 전기 발전량에 따른 최적의 고도각 및 방위각을 가지도록 구동시키기 위한 태양 추적 방법으로서, 소정의 단위 별로 방위각 및 고도각이 변하도록 태양광 발전 시스템을 구동시켜 각각의 방위각 및 고도각에 따른 전기 발생량을 측정하고, 최대 전기 발생량이 측정된 위치로 태양광 발전 시스템을 구동시키는 과정을 주기에 따라 반복함으로써 전기 발생량을 최대화 시키는 방법을 제공한다. 선박, 태양광 발전, 태양 추적, 방위각, 고도각
Abstract:
PURPOSE: A recognition of a situation sensor media access control protocol is provided to perform operation according to the situation in generating an event by setting situation information. CONSTITUTION: A sensor node collects three sample data if the event is sensed. The sensor node transmits the sample data to a sync node of a server through an RF signal. The sample data is finally transmitted to the server. The server determines generated of a real event through comparison between data of a database and a sample data. If the event is generated, the server request transmission of continuous data to a corresponding node.