Abstract: A method for replicating a holographic optical element and a holographic optical element replicated thereby are provided. The holographic optical element is larger than a master. The master has a holographic grating pattern generated on the master by interference of the reflected, diffracted or transmitted beam generated by irradiating the master having a specific diffraction grating pattern formed thereon with a laser beam.

Abstract: The present disclosure provides a waveguide display apparatus. The waveguide waveguide display apparatus of the present disclosure is a waveguide display apparatus for correcting curved surface reflection distortion, the waveguide display apparatus including a waveguide for guiding light inputted from the outside; a first diffractive optical element disposed at the waveguide, and diffracting the light inputted from the outside to the inside of the waveguide; and a second diffractive optical element disposed at the waveguide, and diffracting the light guided by the waveguide to output a plurality of diffracted lights in a direction of a curved surface reflector located outside, wherein the second diffractive optical element has a structure of a diffraction grating corresponding to a curvature of the curved surface reflector such that the diffracted lights are reflected at different locations of the curved surface reflector in directions parallel to each other.

Abstract: The present invention relates to a wound dressing material comprising a fibrillated acellular dermis matrix and a biodegradable polymer aqueous solution and, more specifically, to: a wound dressing material comprising 5-20 wt % of a fibrillated acellular dermis matrix, 0.5-5 wt % of a biodegradable polymer, and 75-94.5 wt % of water; and a preparation method therefor.

Abstract: The present invention relates to a canister, a suction apparatus and a tissue expansion apparatus comprising same, and provides, according to one aspect of the present invention, a suction apparatus comprising: a housing having an inlet and an outlet; a pump disposed in the housing and suctioning air flowing in via the inlet; a first flow line for connecting the inlet and an inflow port of the pump; a second flow line for connecting an outflow port of the pump and outside air; a control valve disposed in the housing and provided with a first port connected to the first flow line, and a second port connected to the second flow line; a battery disposed in the housing and supplying power to the pump; and a control unit for controlling the pump and the control valve.

Abstract: The present invention relates to a detachable volume measuring apparatus and a tissue expansion apparatus comprising same, and provides, according to one aspect of the present invention, a volume measuring apparatus which is mounted to a tissue expansion apparatus comprising a suction apparatus for generating negative pressure inside a dome, the volume measuring apparatus comprising: a housing having an inlet into which outside air flows, and an outlet for supplying the outside air to the suction apparatus; a flow line for connecting, in the housing, the inlet and the outlet; first and second pressure sensors respectively provided at two different locations on the flow line; and a control unit for outputting, to the suction apparatus, pressure information measured from the first and second pressure sensors.

Abstract: The present invention provides methods of differentiating mesenchymal stem cells or adult stem cells into nerve cells by treating the mesenchymal stem cells or the adult stem cells with an electromagnetic field having a high intensity of 100 to 1,500 mT and a low frequency of 0.01 to 100 Hz. These methods also provide injecting the mesenchymal stem cells or adult stem cells into a subject prior to treating the mesenchymal stem cells or adult stem cells with an electromagnetic field having a high intensity of 100 to 1,500 mT and a low frequency of 0.01 to 100 Hz.

Abstract: The present invention relates to a wound dressing material comprising a fibrillated acellular dermis matrix and a biodegradable polymer aqueous solution and, more specifically, to: a wound dressing material comprising 5-20 wt % of a fibrillated acellular dermis matrix, 0.5-5 wt % of a biodegradable polymer, and 75-94.5 wt % of water; and a preparation method therefor.

Abstract: The present invention relates to a method of differentiating mesenchymal stem cells or adult stem cells into nerve cells by treating the mesenchymal stem cells or the adult stem cells with an electromagnetic field having a high intensity of 100 to 1,500 mT and a low frequency of 0.01 to 100 Hz. The present invention also relates to a medical device to which the method is applied. The method of differentiating nerve cells by using a magnetic field, and a composition according to the present invention induce the differentiation of adult stem cells into nerve cells by using a low-frequency, high-intensity electromagnetic field, so that nerve cells or neural stem cells can easily be differentiated through only electromagnetic field treatment in a short time.

Abstract: A method for the preparation of dermal papilla tissue comprising the step of culturing mesenchymal stem cells in a medium having a specific composition is provided. The method makes it possible to form in vitro a quantity of dermal papilla tissues having hair follicle inducting ability and, accordingly, it can be effectively used for the treatment of alopecia through cell transplantation.

Abstract: A method for the preparation of dermal papilla tissue comprising the step of culturing mesenchymal stem cells in a medium having a specific composition is provided. The method makes it possible to form in vitro a quantity of dermal papilla tissues having hair follicle inducting ability and, accordingly, it can be effectively used for the treatment of alopecia through cell transplantation.