Sk Telecom Company, Ltd.

Sk Planet Co., Ltd.

Lg Electronics Inc.

Joosik Lee

Youngshin Yoon

Sungjun Kim

Youngil Kim

Sunshin An

Jaesic Jeon

Youngmin Ji

Sangwoo Rhie

Sangmok Sohn

Soonjae Jeong

Wonjun Lee

Donghwan Lee

Inkeun Ryu

Wonsuk Chung

Donghahk Lee

Seongsoo Park

Joongnyon Kim

Myungsung Lee

Daesic Woo

Dohyun Koo

Sangshin Lee

Hyunmin Jang

Sukil Kang

Junghee Han

Seongjae Jang

Donghahk 809-1101 Imaechon Jinheung Apt Lee

Disclosed is a wireless charger for a mobile terminal in a vehicle, the wireless charger including: a tray on which the mobile terminal is placed and which has one or more holes; a coil part configured to wirelessly provide electrical energy to the mobile terminal; a driving part configured to drive the coil part; a case which accommodates the coil part and the driving part and in which an air flow path is formed; and a fan module configured to discharge air toward the mobile terminal through the holes or suction ambient air of the mobile terminal.

Wireless charger for mobile terminal within vehicle, and vehicle

The present invention relates to a method for measuring a location of a radio frequency identification (RFID) reader by using beacons, and an RFID system for measuring a location of a moving RFID reader in an RFID system comprising: a plurality of beacon devices for emitting beacons; an RFID tag for transmitting pre-stored information by using radio frequency identification; and an RFID reader for calculating a current location using a plurality of at least three beacons wherein the RFID reader receives the plurality of beacons from the plurality of beacon devices while moving, and receiving the information from the RFID tag by using the radio frequency identification. According to the present invention, it is possible to increase the accuracy of the location measurement of a moving RFID reader in an RFID system because the location of the RFID reader is measured in consideration of propagation environments.

Method for measuring location of radio frequency identification reader by using beacon

The present invention relates to a method for determining an optimal frame size for tag collision prevention in an Aloha-based RFID system in which frame sizes limited to a certain unit are used to identify tags, the method including the steps of using an RFID for: (a) calculating an estimated optimal frame value for the RFID reader identifying the tags; (b) calculating expected time delays per tag of a left-hand frame size and a right-hand frame size, which show the smallest differences with respect to the estimated optimal frame value, among the frame sizes; (c) comparing, the expected time delay per tag of the left-hand frame size with that of the right-hand frame size; and (d) determining a frame size which has a smaller expected time delay per tag, between the left-hand frame size and the right-hand frame size, to be an optimal frame size.

Method for determining optimal frame size for tag collision prevention in RFID system

Disclosed is a method for providing a multimedia Ring Back Tone (RBT) service by using a receiver-side switching center, which comprising the steps of: (a) receiving an ISDN User Part (ISUP) call connection request message including information (multimedia codec information) regarding a multimedia codec from a caller-side switching center when the originating terminal attempts a call connection to a terminating terminal; (b) transmitting the ISUP call connection request message including the multimedia codec information to a sound source-providing server; (c) requesting the caller-side switching center to set the multimedia codec, thereby activating a routing path for the RBT service; and (d) receiving a RBT sound source selected using the multimedia codec information from the sound source-providing server and transmitting the RBT sound source to the caller-side switching center.

Method and system for providing multimedia ring back tone service by using receiver-side switching center

Growing community of inventors

Seoul, South Korea

Joosik Lee