Korea Aerospace Research Institute

Kepco Nuclear Fuel Co., Ltd.

Electronics and Telecommunications Research Institute

In Kyu Kim

Sang Man Moon

Ki Bum Park

Jeong Hoon Kim

Dong Hyun Cho

Sung Jun Park

Min Ki Kim

Kwang Eui Pyun

Gyung Ock Kim

Hae Dong Kim

Je Won Lee

Sang Jong Lee

Gi Hyuk Choi

Jung Cheol Shin

Hyoun Kyoung Kim

Se Ick Son

Sang Cherl Lee

Yong Shin Choi

Ho Yeon Hwang

Young Duk Sim

Jong Chul Kim

Dong Young Rew

Chan Hong Yeom

Eun Sup Sim

Tae Sik Kim

Jin Young Suk

Jin-Won Kim

Tae Soo No

Hae Chang Lee

Sung Tae Moon

Hyeon Cheol Gong

Sun Doo Kim

Chan Hyun Park

Sang Hyuck Han

Seung Hwan Lee

Kyoo Chang Oh

Provided is an apparatus for fatigue testing a bulge tool having a WH-type skeleton, the apparatus including: a fixing bracket having tool holes penetrated through opposite sides thereof; a tool housing coupled to the tool hole of the fixing bracket and having the bulge tool inserted and installed therein; a moving rail installed at one side of the fixing bracket in a lengthwise direction of the tool housing and providing a reciprocating movement path facing the tool housing; a moving bracket reciprocating along the moving rail; a pusher protrudingly installed from the moving bracket toward the tool housing and moving in and out of the bulge tool; a measurement means installed between the pusher and the moving bracket, measuring a load applied to the bulge tool; and a drive means for generating power reciprocating the moving bracket on the moving rail.

Apparatus for fatigue testing bulge tool having WH-type skeleton

Provided is an unmanned aerial vehicle that broadcasts a route and future location information of the unmanned aerial vehicle within preset coverage based on sensing data and current location information of the unmanned aerial vehicle. The unmanned aerial vehicle includes a calculator configured to calculate a predicted route and second location information of the unmanned aerial vehicle corresponding to a preset period of time based on first location information and sensing data; and a transmitter configured to periodically broadcast a first notification signal that includes the first location information, the predicted route, and the second location information.

Unmanned aerial vehicle

A gap control device for a Pilger die assembly of cold Pilger mills. The gap control device can independently control the height of a pair of bearing blocks which axially support an upper die. A lower plate has first and second receiving holes which respectively correspond to the upper portions of a pair of bearing blocks. First and second wedge plates are fitted into the receiving holes, and respectively have inclined surfaces on the upper portions thereof. First and second adjustment blocks respectively have inclined guide surfaces to be in surface contact with the inclined surfaces of the wedge plates, and are movable horizontally with respect to the lower plate. An upper plate is assembled to the upper portion of the lower plate to cover the adjustment blocks. First and second adjustment bolts allow the first and second adjustment blocks to be respectively manipulated in a horizontal direction.

Gap control device for pilger die assembly of cold pilger mills

An apparatus and method of charging and housing of an unmanned vertical take-off and landing (VTOL) aircraft is disclosed. The apparatus can accommodate an aircraft, and the apparatus includes a landing platform on which the aircraft lands, a housing portion to monitor state data by housing or charging the aircraft, and a sensor to assist in landing of the aircraft by allowing the aircraft to communicate with the apparatus. The apparatus enhances operational efficiency by reducing a travel time of the aircraft.

Apparatus and method of charging and housing of unmanned vertical take-off and landing (VTOL) aircraft

A pilger die and a pilger mandrel which are used to produce a dashpot tube which can be used in a nuclear fuel assembly having an outer diameter of 31.75 mm or less and an inner diameter 25.654 mm or less, by processing a reduced expression zirconium alloy tube in two pilgering processes (a first step pass and a second step pass) using a single pilgering apparatus. Furthermore, provided are methods of manufacturing the pilger die and the pilger mandrel, and the dashpot tube for the nuclear fuel assembly. The dashpot tube can be manufactured by the single pilgering apparatus provided with the pilger die and the pilger mandrel.

Pilger die and pilger mandrel for manufacturing dashpot tube for nuclear fuel assembly and method of manufacturing the pilger die and the pilger mandrel

There is provided a frequency transceiver for automatically controlling a TX/RX IF signal in a radar or a communication system, which transmits/receives an RF signal. The frequency transceiver includes a local oscillator for oscillating a VHF proportional to a VHF oscillation control voltage, a first IF processor for mixing an external RF signal with the VHF signal oscillated by the local oscillator and converting the RF signal into an IF signal proportional to the VHF signal, a second IF processor for mixing the RF signal oscillated by the RF oscillator with the VHF signal oscillated by the local oscillator, converting the RF signal into an IF signal proportional to the VHF signal, and converting the converted IF signal into a voltage, a control signal generator for generating a control signal to control the VHF signal oscillation of the local oscillator according to an output voltage of the second IF processor, and a VHF oscillation controller for outputting the VHF oscillation control voltage to the local oscillator according to the control signal generated from the control signal generator.

Frequency transceiver for controlling intermediate frequency

There is disclosed a photodetector having two or more avalanche-gain layered structures and multi-terminals. The avalanche photodetector includes an emitter light absorption layer structure located between a collector layer and an emitter layer (top contact layer) stacked on a substrate. The photodetector further comprises multiple avalanche-gain layered structures consisting of a charge layer, a multiplication layer and a contact layer between the light absorption layer and said collector layer.

Avalanche photodetector

Growing community of inventors

Daejeon, South Korea

In Kyu Kim