Patent application number | Description | Published |
20080266106 | NAVIGATION APPARATUS AND METHOD USING RFID - Disclosed is a navigation apparatus and method using RFID that is capable of providing information on a current position and a moving direction to the destination. An antenna unit has directivity in a predetermined direction and receives at least one radio signal transmitted from at least one RFID tag. An RFID reader converts the at least one radio signal provided by the antenna unit into information on the at least one RFID tag in a digital form, measures the reception strength of the at least one radio signal, and provides the information on the at least one RFID tag and information on the received strength. A control unit determines the current position and moving direction on the basis of the information on the at least one RFID tag and the information on the reception strength provided from the RFID reader. Accordingly, it is possible to accurately recognize the current position and the moving direction of the navigation apparatus and guide the moving direction to the destination. | 10-30-2008 |
20090091446 | SECURITY SYSTEM USING LASER RANGE FINDER AND METHOD OF DETECTING INTRUDER USING LASER RANGE FINDER - A security system using a laser range finder that can precisely determine an existence and a location of an intruder, and a method of detecting the intruder using the laser range finder are provided. The security system using a laser range finder, the security system includes: the laser range finder emitting laser beam, receiving the reflected laser beam, measuring a distance between the laser range finder and a target object, and detecting an existence and a location of an intruder; and at least one reflective means reflecting the emitted laser beam toward the laser beam finder, wherein at least one reflective means is spaced by a predetermined distance of the laser range finder and is installed a predetermined distance from the laser range finder. | 04-09-2009 |
20090147790 | PACKET TRANSMISSION SCHEDULING METHOD IN WIRELESS NETWORK AND PACKET TRANSMISSION METHOD USING THE SAME - Provided are a packet transmission scheduling method in a wireless network and a packet transmission method using the same. The packet transmission scheduling method, includes storing location information and a path loss exponent of each node on a multiplexing path; calculating a Signal-to-Interference and Noise Ratio (SINR) between nodes on a predetermined path based on the stored location information; when the calculated SINR exceeds a threshold, forming the paths as a path table; and scheduling packet transmission based on the formed path table. | 06-11-2009 |
20100026462 | METHOD OF RECOGNIZING RFID TAG FOR THE PURPOSE OF PREVENTING THOURGHPUT INVERSION AND RFID READER PERFORMING THE SAME - A method of recognizing a tag in an RFID reader includes: obtaining a predetermined frame size in the case where throughput obtained by reflecting a slot length based on the remaining number of tags except for recognized tags within a frame progressing current tag recognition that substantially has a maximum value; and when the current frame size is different from the predetermined frame size, stopping the current progress of frame and changing the current frame size into the expected frame size. The method of recognizing a tag may further include when the current frame size is equal to the expected frame size, changing the current frame size into the frame size that does not cause a throughput inversion phenomenon for the remaining number of tags to be recognized within the frame progressing the current tag recognition. By the throughput inversion phenomenon, the occurrence of throughput loss can be prevented and the tag recognition time is reduced to recognize the tags at high speed. | 02-04-2010 |
20150078213 | MEDIUM ACCESS CONTROL METHOD IN SINGLE CHANNEL WIRELESS NETWORK ENVIRONMENT - Disclosed herein is a medium access control method in a single channel wireless network environment, which is a medium access control method of a receiving side terminal capable of communicating in a full-duplex communication scheme. The medium access control method includes: receiving a frame header of a data frame; and transmitting an ACK frame in response to the frame header. | 03-19-2015 |
20150078214 | ACCESS POINT FOR WIRELESS LAN AND MEDIUM ACCESS CONTROL METHOD THEREOF - In a medium access control method of an access point for a wireless LAN, the access point is capable of full-duplex communication, and the medium access control method includes receiving a frame header of a first data frame from a first terminal, and transmitting a second data frame to a second terminal while the first data frame is received from the first terminal. | 03-19-2015 |
20150131574 | WIRELESS COMMUNICATION SYSTEM AND PACKET COMMUNICATION THEREFOR - Disclosed is a wireless communication system including: an access point; and at least two wireless devices capable of transmitting packets to the access point at the same time, wherein the access point receives a packet from at least one of the at least two wireless devices within multi-packet reception (MPR) capability after determining whether packet reception is beyond the multi-packet reception (MPR) capability, when receiving a request to send (RTS) from one of the at least two wireless devices. Thus, it is possible to obtain maximum throughput by optimally using the MPR capability and stably perform packet communication even though the number of wireless devices changes or the wireless device is moved. | 05-14-2015 |
20150153176 | VEHICLE, VEHICLE CLOUD SYSTEM, AND DATA DISSEMINATION SYSTEM - Disclosed is a data dissemination system for vehicles. The data dissemination system includes a vehicle, a vehicle cloud system, and access points connecting with and transferring data to the vehicle and the vehicle cloud system and being stationary near a road, wherein the vehicle comprises a navigator for determining location information, the vehicle cloud system comprises a dissemination setting unit for determining which data to disseminate to which access point based on the location information and vehicle route information, and the data disseminated to the access point is disseminated to the vehicle. According to the present invention, data transfer between vehicles and an infrastructure can be easily achieved such that a large amount of data can be exchanged therebetween, data transfer efficiency can be enhanced, and network resources can be fully utilized. Accordingly, the present invention has advantages of contributing to dissemination and utilization of the vehicle cloud system. | 06-04-2015 |