Abstract: The present invention relates to a method, a device and a computer-readable medium for training a machine learning model performing competency evaluation on a plurality of competencies, and more particularly, to a method, a device and a computer-readable medium for training a machine learning model performing competency evaluation on a plurality of competencies to efficiently train the machine learning model for outputting an evaluation result of each of the competencies from input data related to answers and the like of an evaluatee.

Abstract: A phosphor wheel comprising: a substrate having a recess, a phosphor layer disposed in the recess, and a first reflection layer surrounding the substrate. Thus, heat emission efficiency is increased, and it is possible to prevent defects such as cracking or discolouration of the phosphor layer.

Abstract: A color wheel according to an embodiment of the present invention comprises: a basic fluorescent body having a basic light-emitting wavelength; and at least one modified fluorescent body having at least one light-emitting wavelength different from the basic light-emitting wavelength, wherein the basic fluorescent body comprises Y3Al5O12 and the modified fluorescent body comprises Y3(GaxAl(1-x))5O12:Ce in which gallium is doped on the basic fluorescent body

Abstract: Alighting apparatus can include a light emitting element that can irradiate light, and an optical conversion layer disposed on the light emitting element for converting the irradiated light. The optical conversion layer can include crystal grains of a first phosphor and crystal grains of a second phosphor, and the crystal grains of the first phosphor and the crystal grains of the second phosphor can be in mixed form in the optical conversion layer.

Abstract: Disclosed is a reflecting screen configured to reflect an image introduced from a projector. The reflecting screen includes a black resin layer having a dark color, wherein the black resin layer includes a plurality of slopes formed at one surface thereof so as to face in a given direction, the slopes being arranged in the vertical direction, and stepped portions formed between the slopes, corrugations formed at the slopes, and a reflecting layer formed at the slopes of the black resin layer. The reflecting screen is capable of reducing raw material costs and manufacturing costs and reducing the weight and volume of a product, as a result of simplifying a multilayered structure of a reflecting screen.