Korea Advanced Institute of Science and Technology

Hyundai Motor Company

Byung Man Kwak

Young-Ho Cho

KwyRo Lee

Kwanhum Park

Soo Hyun Kim

Kyung-Soo Kim

Sang Jun Yoo

In Gwun Jang

Eun Ho Kim

Yunsub Jung

Youn Sik Park

Hanjong Ju

Kyung Woon Kwak

Yun Sic Hong

Doo Yeol Koh

Yoon Keun Kwak

Kyung Ii Kim

Kyong-Soo Kim

A crane for loading and unloading a cargo includes multi-stage trolley. The multi-stage trolley for a crane includes a first trolley movable in a longitudinal direction along a boom of the crane; a second trolley movable in a lateral direction on the first trolley; a hoisting wire provided in the longitudinal direction along the boom; a spreader connected to the hoisting wire through the first trolley and the second trolley and supported by the hoisting wire, the spreader being movable in a vertical direction according to a movement of the hoisting wire. The multi-stage trolley further includes a sheave block unit for changing a direction of the hoisting wire to maintain a vertical level of the spreader constant when the first trolley and/or the second trolley is moved.

Multi-stage trolley for a crane and a crane therewith

A symmetrical proof-mass accelerometer with a self-diagnosis capability and its fabrication method are disclosed. The accelerometer has symmetrical mass distribution with respect to the plane of the cantilever beam with an offset between upper and lower masses, so as to minimize cross-axis sensitivity and facilitate self-diagnostic resistor installation. This accelerometer can be applied to automobile electronics systems, consumer electronics, and industrial electrical measurement systems, in which the measurements of displacement, velocity, vibration, acceleration, angular acceleration and their changes are required.

Self-diagnostic accelerometer with symmetric proof-mass and its

A symmetrical proof-mass accelerometer with a self-diagnosis capability and its fabrication method are disclosed. The accelerometer has symmetrical mass distribution with respect to the plane of the cantilever beam with an offset between upper and lower masses, so as to minimize cross-axis sensitivity and facilitate self-diagnostic resistor installation. This accelerometer can be applied to automobile electronics systems, consumer electronics, and industrial electrical measurement systems, which require measurements of displacement, velocity, vibration, acceleration, angular acceleration and their changes.

Growing community of inventors

Taejon, South Korea

Byung Man Kwak