Korea Institute of Science and Technology

Sk Telecom Company, Ltd.

Airpoint Co., Ltd.

Seong-Keun Kim

Ji-Won Choi

Chong-Yun Kang

Jin-Sang Kim

Seung-Hyub Baek

Sung-min Cho

Jong-Tae Ihm

Soon-Man Hong

Seok-Jin Yoon

Joo-Sik Lee

Seung-Sang Hwang

Kyung-Youl Baek

Sung-Jun Baik

Chong-Min Koo

Dow-Bin Hyun

Beomjin Kwon

Im-Jun Roh

Sang-Ho Cho

Sung-Youl Park

Gyeong-Ho Choi

Byung-Suk Lee

Kwang-Chon Kim

Disclosed is a thermoelectric composite material includes a thermoelectric material including crystal grains; and a MXene inserted at boundaries of the crystal grains consisting of the thermoelectric material. Accordingly, the thermoelectric composite material may have a reduced thermal conductivity and an increased electrical conductivity. Furthermore, mechanical properties of the thermoelectric composite material may be improved. Thus, the thermoelectric composite material may improve the thermoelectric ability of a thermoelectric module including the same. A method of manufacturing the thermoelectric composite material includes coating MXene on a surface of a thermoelectric material powder including crystal grains; and sintering the thermoelectric material powder coated with the MXene to form a sintered body including the MXene inserted at boundaries of the crystal grains consisting of the thermoelectric material.

Thermoelectric composite material comprising MXene and method for manufacturing the same

A method for manufacturing a thermoelectric material is provided. According to the method, a first shaped body is formed from a thermoelectric powder, of which a crystal has a layer structure. An extruded body is formed by extruding the first shaped body. A plurality of cut-off pieces are formed by cutting the extruded body along a cross-section perpendicular to an extrusion direction. A second shaped body is formed by stacking and pressing the cut-off pieces along a direction perpendicular to the extrusion direction. According to the above, a thermoelectric ability of a thermoelectric material and an efficiency for manufacturing a thermoelectric module may be improved.

Method for manufacturing thermoelectric material having high efficiency

Disclosed herein is a radio frequency (RF) repeater comprising an analog signal processing unit and a digital signal processing unit, wherein the analog signal processing unit includes a filtering unit; an amplification unit on receiving side; a frequency conversion unit on receiving side; a frequency conversion unit on transmitting side; and an amplification unit on transmitting side, and the digital signal processing unit includes a receiving signal detection unit; the automatic gain control unit; a feedback signal detection unit; a feedback signal combining unit; a feedback signal elimination unit; an automatic delay control unit; and the control unit. According to the RF repeater and repeating method, installation cost is reduced, limitations in output magnitude and installation are overcome, and ensuring high output power characteristics.

Radio repeater for mobile communication system and repeating method using the same

Growing community of inventors

Seoul, South Korea

Seong-Keun Kim