Seoul National University

The Industry & Academic Cooperation in Chungnam National University (Iac)

Center for Advanced Meta-Materials

Nam Eun Park

Joong Seok Lee

Yoon Young Kim

Jieun Yang

Shin Young Kim

Sung C Jeong

Yu Bin Oh

The present invention provides a mode conversion reflector provided on an edge surface of an elastic medium, capable of mode-converting an incident ultrasonic wave with high efficiency and simultaneously reflecting the wave in a desired direction. The mode conversion reflector according to the embodiment includes an elastic medium; and a reflective layer formed of a non-planar structure on an edge surface of the elastic medium, in which an interference phenomenon caused by diffraction of wave occurs by the reflective layer, so that an ultrasonic wave incident through the elastic medium is mode-converted and reflected in a predetermined direction.

Mode conversion reflector

Provided are a sound absorbing and insulating structure is configured to be placed in a sound wave propagation path to reduce noises, and a method of designing the sound absorbing and insulating structure. The sound absorbing and insulating structure includes: a back panel arranged along a sound wave propagation path and having a flat-plate shape; a plurality of rigid partitions spaced apart from the back panel and arranged at intervals in parallel with each other so as to form resonant spaces; and a fixation frame fixing the rigid partitions to the back panel.

Sound absorbing and insulating structures by tailoring sound velocities, and method of designing the sound absorbing and insulating structures

An apparatus for implementing stereoscopic images without control programs on a CRT monitor in a computer system includes a video adapter storing the information of stereoscopic images reading out the contents of the information, and outputting them as analog image signals of red, green and blue colors, vertical synchronizing signals and horizontal synchronizing signal, an analog scan line controller operating in response to external on/off control signals, and outputting the analog image signals including left eye image information and right eye image information to the monitor in response to the vertical synchronizing signals from the video adapter, and a shuttering device being operated by at least any one of the signals from the video adapter.

Apparatus for implementing stereoscopic images in computer system

Growing community of inventors

Seoul, South Korea

Joong Seok Lee