Abstract:
The present invention relates a method for determining (recognizing) the position of each sensor node forming a wireless sensor network. More specifically, the present invention is about a method for recognizing a range-free position, which calculates the average number of adjacent node hops and determines the position of the sensor node based on the same, and a system using the same.
Abstract:
저전력 파랑 자가 발전을 이용한 충전 장치가 개시된다. 이 충전 장치는 프로펠러 고정 틀에 고정된 단일 프로펠러와, 좌우 회전을 통해 정/반 교류 전원을 병렬로 생성하는 두 개의 발전 모터, 및 상기 단일 프로펠러의 축에 연결되며, 파랑에 의한 상기 단일 프로펠러의 상하 운동을 증속된 좌우 회전으로 상기 두 개의 발전 모터가 좌우 회전하도록 구동하는 두 개의 증속 기어박스를 포함하는 저전력 파랑 발전기, 및 상기 생성된 교류 전원을 증폭 및 안정화한 후 직류 전류로 변환하여 충전지를 충전하는 충전부를 포함한다. 이에 따라 저전력이 필요한 부이, 부표, 소형 선박, 기타 해상 부유 장치 등의 지시등, 표지등, 기타 모든 저전력 장치에 전력을 공급할 수 있게 된다.
Abstract:
PURPOSE: A smart TV capable of offering a video call service uses a microphone of a remote controller to recognize a user's voice at a close location, and thereby improves voice recognition and quality of voice call. CONSTITUTION: A remote controller (200) recognizes a user's voice with a microphone (230) and transmits the recognized user' voice. A main body (100) obtains a user's image from a videotelephony service by a camera. If the user's voice is transmitted from the remote controller, the main body transmits the user's voice and the user's image through a set smart TV communications interface to other user's device, receives the image and voice of the other user are received from the other user's device, and displays/replays it. [Reference numerals] (110) First communication unit; (120) Control unit; (130) Camera; (140) Display unit; (150) Speaker; (160) Wired communication unit; (210) Second communication unit; (220) Signal processing unit; (230) Microphone; (240) Input unit; (AA) IP network
Abstract:
PURPOSE: An interference elimination method of a frequency wireless repeater in a marine telematics environment is provided to control a step size of an LMS(Least Mean Square) filter by estimating a channel state of a feedback signal. CONSTITUTION: A channel state of a feedback signal is estimated based on an output signal of an LMS filter. The feedback signal is eliminated by controlling the step size of the LMS filter based on the estimated channel state of the feedback signal. When the power change of the output signal is rapidly changed as time passed, the channel state is determined as fast fading. When the power change of the output signal is slowly changed as time passed, the channel state is determined as slow fading.
Abstract:
PURPOSE: A cluster-based routing method for sensing an error in a vessel network is provided to continuously perform a data collection and delivery function when an unexpected error in a main cluster head causes suspension of operation. CONSTITUTION: A backup cluster head to replace a main cluster head is selected. The main cluster head and the backup cluster head receive data from a sensor node in a cluster in order to prepare for an error of the main cluster head. When an error occurs in the main cluster head, a base station makes the backup cluster head to take a role of the main cluster head. The backup cluster head collects the data from the sensor node. The backup cluster head merges the data. The backup cluster head transmits the merged data to the base station. [Reference numerals] (AA) Base station checks the failure of a main cluster head; (BB) Base station instructs a backup cluster head to act as the main cluster head; (CC) Backup cluster receive data from a sensor node as before; (DD) Merge the data when all sensor data are received; (EE) Backup cluster head transmits the merged data to the base station
Abstract:
PURPOSE: A method for tracing a UWB(Ultra-WideBand) signal is provided to analyze a generated surrounding peak and a generated problem because of the shape of a correlation function of the UWB signal and to solve the problem. CONSTITUTION: Synchronization of a UWB system is performed. A surrounding peak of a UWB correlation function is removed in a tracing process for the synchronization. The surrounding peak is removed based on a receiving signal and the change of a correlation value. A sharp autocorrelation function is obtained by removing values of the correlation function scattered around surrounding peaks. [Reference numerals] (AA) Tracing process
Abstract:
PURPOSE: A fault optical network unit detection method using data transmission error detection in a GPON(Gigabit-capable Passive Optical Network) is provided to detect a fault ONU(Optical Network Unit) using detection of a generated data transmission error when light of the ONU connected to an OLT(Optical Line Terminal) is transmitted in the GPON. CONSTITUTION: A MAC(Medium Access Control) layer monitors traffic by using a GEM(GPON Encapsulation Method) header of a GTC(GPON Transmission Convergence) frame. The MAC layer finds an ONT(Optical Network Terminal) which data is not delivered. The MAC layer assigns an upstream bandwidth of the ONT with other method which is not round-robin. The MAC layer detects a fault ONT. [Reference numerals] (AA) Communication error; (BB) Example of normal operation
Abstract:
PURPOSE: A reduced TPC algorithm method for a next generation DVB-RCS system is provided to improve an encoding rate, to reduce an amount of calculation and to decrease calculation time. CONSTITUTION: An e-BCH is applied in a horizontal encoding method. An e-BCH is applied in a vertical encoding method. 0 is inserted into a horizontal and vertical encoder and a rate compatible encoding rate is controlled.
Abstract:
PURPOSE: An implementation method of an efficient voice/music classifier proper to marine environment is provided to obtain input vectors from a cache memory of the classifier and to convert a source code of the classifier, thereby shortening execution time and saving energy consumption. CONSTITUTION: An input vector is obtained from a cache memory of a classifier. A source code of the classifier is converted. The source code of the classifier is converted by adding an intermediate value storage variable and the last classification value storage variable for processing input vectors at the same time. [Reference numerals] (a) Address of a support vector; (b) Content of a cache block 0 and a register n
Abstract:
PURPOSE: A data communication method between ship and land by utilizing an OFDMA sub-channel is provided to overcome a limited frequency resource in the environment where the number of ships increases and to efficiently avoid collision of important data of ships. CONSTITUTION: If a navigation identifier receives a plurality of maritime communication data carried in an OFDMA sub-channel of a plurality of group As, the navigation identifier confirms the existence of a repeatedly used OFDMA sub-channel in the OFDMA sub-channels of a plurality of the group As. If there is an OFDMA sub-channel with collision, the navigation identifier modulates maritime communication data carried in the collided OFDMA sub-channel with an OFDMA sub-channel in a group B and transmits the data to a land integration base station. [Reference numerals] (AA) OFDMA sub-channel; (BB) Sub-channel group A; (CC) Sub-channel group B; (DD) OFDMA sub-channel selector