Center for Advanced Meta-materials

Seoul National University

Min Woo Kweun

Jae Hyun Kim

Yoon Young Kim

Hak Joo Lee

Kwang Seop Kim

Bong Kyun Jang

Se Jeong Won

Xiong Wei Yang

Hyeon Don Kim

Chun Guang Piao

Proposed are a stretchable display panel device capable of effectively correcting an image according to a strain ratio and a method of correcting the image. The stretchable display panel device includes a stretchable display panel, a measurement unit, and a correction unit. The measurement unit measures the strain ratio of the stretchable display panel. The correction unit corrects the image on the stretchable display panel on the basis of the strain ratio. The expandable and contractible display panel overall has a uniform strain ratio and has a negative effective Poisson's ratio. The strain ratio is a strain ratio in a first direction.

Stretchable display panel device and image correction method therefor

An ultrasonic transducer employing a meta slab includes a piezoelectric body configured to generate elastic waves; a meta slab connected to the piezoelectric body and configured to induce elastic wave mode conversion resonance with respect to the elastic waves incident on the meta slab; and a wedge connected to the meta slab, attached to an external surface of a pipe, and configured to transmit the elastic waves having passed through the meta slab to the pipe. The meta slab includes an anisotropic medium and a thickness of the meta slab satisfies the equation as follows: d=m&#xb7;n&#xb7;&#x3bb;/4, d=m&#xb7;n&#xb7;&#x3bb;/4, n/2&#x2212;n/2=odd. Thus, highly-efficient flow velocity measurement is possible.

Ultrasonic transducers for flow velocity measurement with meta slab

Growing community of inventors

Seoul, South Korea

Min Woo Kweun