Abstract:
PURPOSE: A cell management method and a handover method are provided to increase the accuracy of handover generated in a boundary area of a cell by reducing the size of a cell management message including the information of a neighboring base station. CONSTITUTION: A serving base station broadcasts a neighboring base station notification message to a terminal. The neighboring base station notification message includes the information of a sector, in which a terminal is located, and the information of a base station which locates in a boundary area of a cell. A neighboring base station provides cell tier information to the terminal. When a reception signal of the serving base station is maintained during timeout time set as a predetermined value, the terminal handovers data to an adjacent cell. The predetermined value is smaller than a value except for a variable hysteresis margin of handover set from the reception signal of the neighboring base station. [Reference numerals] (AA) Sharing femtosystem network topology; (BB,JJ) Terminal analyzes cell signals; (CC) Cell signal quality(time > hysteresis & serving cell Hysteresis considering overlapped cells); (NN) Terminal and base station determine handover(handover as rank 2); (OO) IEEE 802. 16e, FBS handover;
Abstract:
PURPOSE: A signal extracting device is provided to improve a CNR(Carrier-to Noise Ratio) by generating PRZ(Pseudo Return-to-Zero). CONSTITUTION: A clock extracting unit extracts a clock from an NRZ signal. Interval lattice is regularly arranged in parallel. A generating unit generates a clock signal by using an optical fiber ring laser which is locked with the interval lattice. The interval lattice is constructed as a cladding mode and a core mode. The interval lattice is used as an NRZ-to-PRZ converter.
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 sensor network power saving method is provided to improve energy efficiency in a sensor network by managing data packets of a sensor node. CONSTITUTION: When a sensing time is arrived based on a sensing period, a peripheral environment is sensed. When a receiving time is arrived based on a receiving period, an RF(Radio Frequency) device is turned on and receives a state report packet from a child node. The RF device is turned off. When a transmission time is arrived according to a transmission period, the RF device is turned on and transmits sensing information for the peripheral environment to the state report packet of the child node. The RF device is turned off.
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 cooperative transmission method strong against frequency selective fading is provided to obtain a cooperative diversity gain through asynchronous cooperative communication in a frequency selective fading channel. CONSTITUTION: A source node(S) transmits a generated OFDM(Orthogonal Frequency Division Multiplexing) transmission symbol to relay nodes(R1,R2) respectively. Each relay node performs an amplification operation to the received symbol. A destination node(D) performs a cyclic prefix removal to the symbol received through each of the relay nodes. The destination node obtains an estimation value of combination symbols transmitted from the source node. The destination node demodulates actual data symbols through a recombination process by using the estimation value of the combination symbols.
Abstract:
본 발명은 RFID(RADIO FREQUENCY IDENTIFICATION) 태그(TAG) 식별 과정의 충돌방지를 위한 장치 및 방법에 관한 것으로서, 구체적으로는, RFID 태그(TAG) 식별(IDENTIFICATION) 과정에 있어서 태그 정보(ID) 전송의 충돌방지를 위한 장치 및 그 방법에 관한 것이다. 본 발명은 태그 식별 정보 전송을 위하여 전송 슬롯을 결정하는 단계, 전송 슬롯 결정 단계에서 기 할당된 슬롯의 유무를 확인하는 단계, 할당된 슬롯의 확인을 위해 저장된 카운터 값을 확인하는 단계 및 저장된 카운터 값에 따라 전송 슬롯을 결정하고 식별 정보를 전송하는 단계를 포함한다.
Abstract:
The present invention is a system for predicting marine disasters by analyzing marine environment data collected in internal ocean and sea. The prevent invention can stores database of the successively collected marine environment data and minimize the damage in the marine disasters by analyzing the collected marine environment information and predicting the marine disasters. [Reference numerals] (AA) Marine environment collection system;(BB) Water temperature, temperature, temperature per the depth of the sea;(CC) Component including sea eater;(DD) Dissolved oxygen;(EE) GPS, wave, wind speed;(FF) Prediction system;(GG) Red tide generation;(HH) Run-off wave spread;(II) Marine environment disturbance;(JJ) Sea water temperature;(KK) Sea pollution spread;(LL,SS) Others;(MM) Analysis system;(NN) Summary analysis;(OO) Group analysis;(PP) Classification analysis;(QQ) Relation analysis;(RR) Space analysis;(TT) Communication system;(UU) CDMA module;(VV) Internet;(WW) Telephone;(XX) Situation spreading system
Abstract:
The present invention discloses a query-based document summarization device and a method thereof. Given in the present invention, the query-based document summarization device includes a preprocessor which segments an input document into sentences and generates a matrix of the sentences; a query extender which extends queries using the intent-related feedback; a weighting calculator which re-calculates the weighting of a term using the semantic characteristics through non-negative matrix factorization; and a summarizer which generates summarized sentences for the input document using the matrix of the terms and the sentences into which the extended user queries and the re-calculated term weightings are applied. [Reference numerals] (110) Preprocessor;(120) Question extender;(130) Weighed value calculator;(140) Sentence summary device