Abstract:
PURPOSE: A movement state estimating device and a movement state estimating method are provided to calculate a movement state of a user with an accelerometer and a digital compass, thereby accurately estimating the movement state. CONSTITUTION: A movement state estimating device(100) comprises a sensor unit(110) and a movement state determining unit(130). The sensor unit includes an accelerometer(111) sensing the acceleration information of a mobile device(1000) and a digital compass(112) sensing the directional angle information of the mobile device. The movement state determining unit determines a movement state of a user as one among a walking state, a moving state using a vehicle, and a stopped state based on the acceleration information sensed by the accelerometer and the direction angle information sensed by the digital compass. [Reference numerals] (100) Movement state estimating device; (1000) Mobile device; (110) Sensor unit; (111) Accelerometer; (112) Digital compass; (120) Threshold setting unit; (130) Movement state determining unit
Abstract:
PURPOSE: A moving state prediction system and a moving state prediction method thereof are provided to predict a moving state of a mobile device by determining the moving state of the mobile device by using an acceleration sensing unit and a moving direction sensing unit. CONSTITUTION: A sample information generation unit(120) generates the sample information of a mobile device by collecting information sensed by a sensor unit. A moving state calculation unit(130) generates a reference frame by matching sample information generated in a first coordinate with a second coordinate. The moving state calculation unit calculates the moving state of the mobile device. A moving state determination unit(150) predicts the moving state of the mobile device based on information processed in the moving state calculation unit. [Reference numerals] (100) Moving state prediction system; (1000) Mobile device; (111) Acceleration detecting unit; (112) Moving direction detecting unit; (120) Sample information generation unit; (121) Acceleration sample information generation unit; (122) Moving direction sample information generation unit; (130) Moving state calculation unit; (140) Complexity simplification unit; (150) Moving state determination unit
Abstract:
PURPOSE: An AP(Access Point) selecting device and a method thereof are provided to minimize additional delay in the selection of an AP in a wireless communication network environment. CONSTITUTION: A scanning unit(110) receives a beacon message from a plurality of APs. An AP extracting unit(120) extracts an AP complying with a set extraction condition based on beacon information included in the beacon message. An AP selecting unit(160) selects the AP connecting to the AP complying with the selection condition set in the extracted APs. When the extracted condition is complied with extracted reference information, the AP does not execute a security procedure. [Reference numerals] (110) Scanning unit; (120) Access point extraction unit; (130) Extraction reference storage unit; (140) List generation unit; (150) List providing unit; (160) Access point selecting unit
Abstract:
PURPOSE: A control method of a wireless sensor network is provided to store data in a network level by restricting the transmission of an unnecessary message based on the location information of a sensor node in the wireless sensor network. CONSTITUTION: The location information of a caching node(220) is included in an introduction list message. The introduction list message is distributed to a sensor node(210). The sensor node generates sensing data corresponding to a synchronization node. The sensor node transmits the generated sensing data to a caching node corresponding to the location information of the caching node. The caching node returns the sensing data when a data request is received from the synchronization node generating the introduction list message. [Reference numerals] (AA) Wireless sensor network
Abstract:
A transmission power decision method according to network topology configuration based on angular information and a system thereof and a recording medium thereof are provided to continuously maintain information about neighbor nodes that each node has, thereby selectively using another link whenever wireless link connection is failed. The entire network is separated into sectors(510). A database about neighbor node sets included in the separated sectors is configured. The configured database is stored in its own node(520). A neighbor node for a minimum spanning tree is determined to configure a minimum spanning tree(530). Transmission power is determined according to a distance to the neighbor node for a minimum spanning tree(540).
Abstract:
A method for generating and transmitting/receiving location-based data frames by using location information and a system therefor are provided to enable each node within a network to classify data transmission/reception regionally by using the location information of a transmitting/receiving node, and control the number of nodes which can access a transmission medium at once. A position measurement part(230) measures the current location through a position measurement technology. A routing table(220) stores the location information of each node or the corresponding location address information. A location-based data frame generating module(240) confirms the location information of a source node or destination node by using the position measurement part, the direct input by a user or location information stored in the routing table, sets up the location address of the source node or destination node by using the confirmed location information, and then generates a location-based data frame including the set location address.