Electronics and Telecommunications Research Institute

Kyung-Hoon Lee

Seung-Kab Ryu

Kwang-Uk Chu

Uijung Kim

Up Namkoong

Hoon Ki Lee

Dong-Min Kim

Sung-Hyun Kim

Sang-Kyu Kim

In-Ho Hwang

Hui-Rae Cho

Jin-Hyun Kim

Sae-Hoon Ju

Ji-Eun Kim

Jin-Gak Jang

Chun-Soo Kim

Ji Eun Choi

Jae-Ki Lee

Heesun Park

Ki-Baek Kim

Saehoon Ju

Young-Hyoun Kwon

Hee-Sun Park

Young Jun Lee

Chi Hoon Choi

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

An apparatus and a method for preventing an information leakage. The apparatus for preventing the information leakage includes a shielding signal pattern generation unit configured to generate a shielding signal pattern including a radiation band and a radiation suppression band; a shielding signal generation unit configured to generate an electromagnetic leakage shielding signal corresponding to an Orthogonal Frequency Division Multiplexing (OFDM) scheme by using the shielding signal pattern; a signal amplification unit configured to amplify a transmitting power of the electromagnetic leakage shielding signal; and an antenna unit configured to transmit the amplified electromagnetic leakage shielding signal.

Apparatus and method for preventing information leakage

A broadband surge suppression module having an optical coupling channel includes a surge protection circuit unit for eliminating or limiting a surge signal from an input digital signal, a light-emitting circuit unit for receiving an output signal of the surge protection circuit unit, converting the output signal into an optical signal, and transmitting the optical signal, a light-receiving circuit unit for receiving the optical signal from the light-emitting circuit unit, a signal restoration circuit unit for restoring a digital signal from an output signal of the light-receiving circuit unit, and a module casing unit for allowing the surge protection circuit unit, the light-emitting circuit unit, the light-receiving circuit unit, and the signal restoration circuit unit to be located therein, the module casing unit being formed to penetrate through an electromagnetic shielding wall for protecting a control system.

Broadband surge suppression module having optical coupling channel

A signal detection apparatus includes a signal reception unit, an Analog to Digital (A/D) signal processing unit, and a user interface unit. The signal reception unit receives an external signal. The A/D signal processing unit determines whether the received signal is an abnormal signal based on a plurality of signal profiles having different signal characteristics, and obtains the abnormal signal if, as a result of the determination, it is determined that the received signal is the abnormal signal. The user interface unit displays the abnormal signal.

Apparatus and method for detecting signals

A variable frequency microwave pulse generator that includes a high voltage charger for charging with a high voltage, a high pressure gas tank for supplying insulation gas, and an electrode discharge unit. The electrode discharge unit includes a case, an accommodation section defined inside the case, and a pair of electrode sections disposed at one side and the other side of the accommodation section so as to face each other. The pair of electrode sections is spaced apart from each other to define a spark gap therebetween where the insulation gas supplied from the high pressure gas tank is loaded. An annular resonance recess is defined at the central portion of one electrode section of the pair of electrode sections, the depth of the resonance recess being variable in response to an adjustment knob disposed on the case being manipulated.

Microwave pulse generator with variable frequency emission

An antenna line protection device includes a pair of coaxial connectors and a streamer discharge module. The pair of coaxial connectors are disposed on both side ends of the antenna line protection device. The streamer discharge module is coupled between the coaxial connectors so that, when a pulse signal is input via the coaxial connectors, the streamer discharge module induces an electric field and thus establishes a discharge current channel, thereby suppressing an excessive input pulse.

Antenna line protection device

A stacked diode limiter, which can suppress and eliminate a malicious high-power electromagnetic pulse signal and an Intentional Electromagnetic Interference (IEMI) signal that are input to the antenna line of a wireless system and that include a communication service frequency component having a power of several kW or more, includes a stacked diode unit including one or more diode stack parts formed on a center electrode of a coaxial line formed between an input connector and an output connector, each diode stack part being configured such that a plurality of diodes are arranged in series and stacked on top of one another, and an impedance matching unit for configuring dielectrics between the connectors and the coaxial line as heterogeneous dielectrics and matching impedances between the connectors and the coaxial line.

Stacked diode limiter

A high-voltage wideband pulse load is provided. The high-voltage wideband pulse load includes an internal line, a dielectric substance, and an external housing. The internal line includes input terminal, connection electrode and a rod resistor. The resistance of the internal line linearly increases along the moving direction of an incoming pulse by the rod resistor. The dielectric substance is coupled to the internal line in a coaxial structure which covers the exterior of the internal line, and is configured to have a shape of a non-linearly decreasing external diameter along the moving direction so that impedance linearly decreases along the moving direction in contrast with the resistance of the internal line. The external housing is coupled to the dielectric substance in a coaxial structure which covers the exterior of the dielectric substance, and is formed of metal.

High-voltage wideband pulse load

A surge protection apparatus is provided. The surge protection apparatus includes a non-linear element unit, a signal generation unit, and a switching element unit. The non-linear element unit enables an electrical surge to pass therethrough by rapidly decreasing resistance of the non-linear element unit when the difference in voltage between two ends of the non-linear element unit is equal to or greater than a predetermined value. The signal generation unit generates a control signal in response to current which passes through the non-linear element unit. The switching element unit switches the status thereof in response to the control signal.

Surge protection apparatus and method using the same

A high-voltage coaxial cable and a connector are provided. The connector includes inner connector electrode, a connector dielectric enclosing an inner connector electrode, and an external connector housing. The inside electrode of a connector is provided with a tapped hole in one side thereof. The tapped hole corresponds to the threaded single core of a high-voltage coaxial cable. The inside electrode of a connector is selectively assembled with and separated from the high-voltage coaxial cable by selectively screwing the threaded single core into and away from the tapped hole. The connector dielectric is formed along the circumferential surface of the inside electrode, and is provided with a coupling portion. The coupling portion couples the connector with another connector, and is formed to a preset depth in a corrugated shape. The connector housing is formed in a shape that surrounds the connector dielectric.

Growing community of inventors

Daejeon, South Korea

Kyung-Hoon Lee