Abstract: 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.

Abstract: 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·nFS·?FS/4, d=m·nSS·?SS/4, nSS/2?nFS/2=odd. Thus, highly-efficient flow velocity measurement is possible.

Abstract: The anisotropic media has an anisotropic layer, is disposed between outer isotropic media, causes multiple mode transmission on an elastic wave having a predetermined mode incident into the anisotropic media, and has a mode-coupling stiffness constant not zero. A thickness of the anisotropic layer according to modulus of elasticity and excitation frequency satisfies Equation (2) which is a phase matching condition of elastic waves propagating along the same direction or Equation (3) which is a phase matching condition of elastic waves propagating along the opposite direction, to generate mode conversion Fabry-Pérot resonance, ???kqld?kqsd=(2n+1)?, ??Equation (2) ???kqld+kqsd=(2m+1)?, ??Equation (3) kql is wave numbers of anisotropic media with quasi-longitudinal mode. lqs is wave numbers of anisotropic media with quasi-shear mode. d is a thickness of anisotropic media. n and m are integers.

Abstract: 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·nFS·?FS/4, d=m·nSS·?SS/4, nSS/2?nFS/2=odd. Thus, highly-efficient flow velocity measurement is possible.

Abstract: The anisotropic media has an anisotropic layer, is disposed between outer isotropic media, causes multiple mode transmission on an elastic wave having a predetermined mode incident into the anisotropic media, and has a mode-coupling stiffness constant not zero. A thickness of the anisotropic layer according to modulus of elasticity and excitation frequency satisfies Equation (2) which is a phase matching condition of elastic waves propagating along the same direction or Equation (3) which is a phase matching condition of elastic waves propagating along the opposite direction, to generate mode conversion Fabry-Pérot resonance, ???kqld?kqsd=(2n+1)?, ??Equation (2) ???kqld+kqsd=(2m+1)?, ??Equation (3) kql is wave numbers of anisotropic media with quasi-longitudinal mode. is wave numbers of anisotropic media with quasi-shear mode. d is a thickness of anisotropic media. n and m are integers.