Abstract:
PURPOSE: A distribution cooperation protocol method based on a multi-hop UWB(Ultra-WideBand) network for marine telematics is provided to avoid interference generated by a device, which is moved in multi-hop environment, or a plurality of devices, which performs data transmission. CONSTITUTION: When interference or mobility, which is generated by nodes which are existed beyond a communication range, is generated, a new resource allocation information element is generated by using a DRP IE(Distributed Reservation Protocol Information Element) and a DRP availability IE in a channel selection process. The DRP IE and the DRP availability IE are collected from all nodes within the communication range. When DT(Direct Transmission) is selected, a source node performs a DRP reservation negotiation process defined by a WiMedia standard. When RT(Relay Transmission) or CT(Cooperative Transmission) is selected, the source node generates a CoopDRP IE.
Abstract:
PURPOSE: A DRP(Distribution and Replication Protocol) reservation diversity method based on cooperative relay communication is provided to maintain reserved resources by reserving an indirect link which passes through a relay device. CONSTITUTION: If a first indirect path and a second indirect path are able to be reserved, a reservation subject node transmits a reservation detailed state code to a relay node(S44). The relay node transmits the set reservation detailed state code by notifying a relay state to a reservation target node. The reservation subject node transmits the detailed reservation state code to the reservation target node. The reservation subject node receives the set detailed reservation state code. The reservation subject node transmits data via a direct path which is arranged to the reservation target node(S46).
Abstract:
PURPOSE: A network service quality guarantee method in a ship is provided to set variables of RIO(RED(Random Early Detection) with In and Out) again by considering the maximum rate of the whole packets in fixed time sections. CONSTITUTION: A buffer size is determined by being allocated according to a network topology and an AS(Assured Service) sub-class. The variable values of the RIO are set by considering the whole packets and profile packets based on the determined buffer size in fixed time sections. When the profile packets and the whole packets are arrived, the number of the profile packets is determined in the fixed time sections according to the number of the whole packets.
Abstract:
PURPOSE: A message transmission method of an AtoN AIS(aids to navigation automatic identification system) is provided to fully analyze many information necessary for management items of unattended facilities and navigation safety by providing AtoN AIS marine environment, ship integrated monitoring and navigation safety information. CONSTITUTION: The setting of an AtoN AIS is changed by a communication protocol. One selected from a transmission mode, message transmission cycle and transmission slot of the AtoN AIS. When a buoy setting the marine location of the AtoN AIS is out of a location, an alarm message is generated. An identification code of the AtoN AIS is set up or changed. The location of the AtoN AIS on an electronic chart is set up. The type of a transmission and reception channel and the AtoN AIS are changed. [Reference numerals] (AA) AtoN AIS state window; (BB) Message reception window; (CC) Analog port check; (DD) Power save mode; (EE) Transmission message display window; (FF) Decoding completion data reception window; (GG) Communication port set up
Abstract:
PURPOSE: A PFCM(Possibilistic Fuzzy C-Means) and KNN(K-Nearest Neighbor) grouping based mixed wireless indoor positioning method is provided to measure a signal noise ratio received from a plurality of access points, thereby building a wireless fingerprint type database. CONSTITUTION: A database is built with first propagation characteristic value data in a wireless fingerprint mode(S110). A standard point is searched using a KNN(K-Nearest Neighbor)/PFCM(Possibilistic Fuzzy C-Means) mixed technique. k standard points are selected using a KNN technique(S120). A group of the first propagation characteristic value data of the k standard points is formed(S130). A group which has a minimum distance square sum with respect to the first propagation characteristic value data is selected(S140). An average of standard point position coordinates belonged to the selected group is calculated. The location of a terminal is estimated(S150).
Abstract:
PURPOSE: A method for efficiently reusing and managing a frequency by utilizing a seaway mark identification device for marine telematics is provided to supply a frequency reuse method and a frequency utilization method between users in an integrated model which is connected to a land mobile communication system based on OFDM(Orthogonal Frequency Division Multiplexing). CONSTITUTION: A frequency is divided corresponding to distance and is reused. The frequency is assigned to a seaway mark identification device with a CR(Cognitive Radio) function to be reused. A frequency, which use frequency is low, and another frequency which interference is not reached are utilized as a CR frequency. The frequencies are assigned per timeslot. The frequencies are reused in the whole frequency environment. [Reference numerals] (AA) Land integrated system using an OFDMA communication system; (BB) Seaway mark identification device having a cognitive radio function; (CC) Cognitive radio(CR) network; (DD) Frequency reuse in a cognitive radio concept; (EE) Ship B-CR user
Abstract:
PURPOSE: A variable optical microwave notch filter is provided to extract a plurality of signal factors by a single element by a variable method and extract the signal factor in an optical base, thereby providing a method capable of extracting even when the frequency of a carrier is high, when using a plurality of signal carriers in order to receive a plurality of sensors. CONSTITUTION: A variable optical microwave notch filter has a property of obtaining a stable filtering characteristic regardless of the time delay of the reflective optical amplifier which is an incoherent source, and the length of the optical source coherence. The optical source becomes locked by auto-injection by a cavity which is generated between an RSOA(Reflective Optical Amplifier) and an FBG(Fiber optical Bragg Grating), and an oscillation wavelength of the RSOA, which is locked by auto-injection, is decided by a peak wavelength of the FBG.
Abstract:
PURPOSE: A method and an apparatus of ship-borne using a WIBRO uplink frame are provided to prevent the collision of vessel AIS data. CONSTITUTION: A ship-borne device receives AIS data from two or more vessels and senses the collision of vessel AIS data. A collision time slot is transmitted to a land base station through a WiBro channel. A sub channel is allocated by using FLR(Full Loading Range) algorithm.
Abstract:
본 발명은 증강현실을 이용한 선박 항법 시스템의 전자해도 표시 방법에 대하여 개시한다. 본 발명의 일면에 따른 증강현실을 이용한 선박 항법 시스템은, 선박의 주변을 촬영하여 실제 영상을 출력하는 카메라 모듈; GPS 신호를 이용하여 상기 선박의 현 위치를 파악하는 위치감지 모듈; 상기 선박의 주변에 위치한 다른 선박의 운항정보를 확인하는 AIS(Automatic Identification System) 모듈; 항해정보를 포함하는 전자해도를 제공하는 전자해도 제공모듈; 상기 실제 영상에, 상기 전자해도에 따른 항해정보와 상기 다른 선박의 운항정보를 증강현실 처리하여 증강현실 처리된 영상을 출력하는 중앙 처리 모듈; 및 상기 증강현실 처리된 영상을 표시하는 표시모듈 을 포함하는 것을 특징으로 한다.
Abstract:
PURPOSE: A method for implementing an efficient embedded system of an SVM-based sound classifier proper for a marine environment is provided to allocate different transmission rates depending on a voice signal type by accurately distinguishing the voice signal type proper for the marine environment. CONSTITUTION: An embedded system obtains two or more support vectors by learning. The embedded system checks a contribution level of each support vector. The embedded system performs discriminant computation by an SVM(Support Vector Machine) algorithm except for a support vector having a lower contribution level than a preset level.