Electronics and Telecommunications Research Institute

Hankook Tire Co., Ltd.

Ji Eun Choi

Sung Hyun Kim

Kyung-Hoon Lee

Dae Heon Lee

Sung Hee Park

Sae-Hoon Ju

Heesun Park

Sang Woo Cho

Chi Hoon Choi

Young Jun Lee

Ho Youn Kang

Young Hyoun Kwon

An apparatus and method for preventing an electronic device from recording. The apparatus includes a control unit for generating a first modulation signal and controlling the components of the apparatus; a first modulation unit for modulating the first modulation signal to an FM signal; an ultrasonic signal generation unit for generating an ultrasonic signal, the frequency of which is adjusted by changing the value of at least one of a variable resistor and a variable capacitor depending on the magnitude of the FM signal; an amplification unit for increasing or decreasing the magnitude of the ultrasonic signal; a resonance unit for increasing the voltage to be applied to a transducer by generating resonance; and an ultrasound output unit for converting electrical signals into ultrasonic signals using the transducer and radiating a recording prevention signal, converted into the ultrasonic signal, to the microphone of an electronic device.

Apparatus and method for preventing recording of electronic devices

The rubber composition for tire tread and a tire includes 100 parts by weight of a raw material rubber that includes 20 parts by 80 parts by weight of a first solution polymerized styrene-butadiene rubber (SBR1) having a styrene content of 15% to 25% by weight and a vinyl content in the butadiene of 60% to 65% by weight and produced by a batch method; and 60 parts to 90 parts by weight of a silica having a specific surface area measured by nitrogen adsorption of 155 m/g to 185 m/g and a CTAB value of 150 m/g to 170 m/g.

Rubber composition for tire tread and tire manufactured by using the same

Provided are a two-dimensional array antenna and a device for detecting an internal object using the same. The device includes a plurality of unit antennas in a two-dimensional array of m columns and n rows on a board (where m and n are integers greater than 1), a first switch selecting one or more transmitting antenna to radiate a pulse signal onto an internal object in a structure from among the unit antennas; a second switch selecting one or more receiving antenna to collect a signal reflected from the internal object from among the unit antennas, and a transceiving analysis module analyzing information about the position and shape of the internal object.

Two-dimensional array antenna and device for detecting internal object using the same

Growing community of inventors

Daejeon, South Korea

Ji Eun Choi