Abstract: Provided is a picture frame that fixes and posts a notice including a fixing hole along a side end, the picture frame including: a plurality of frames including, in a length direction, a combining groove having a uniform width, and providing an arrangement space of the notice as ends of the plurality of frames are mutually connected; and a fixing unit provided on the combining groove, and fixes the notice by hooking the fixing hole to one end, wherein the fixing unit applies elastic force to the notice through the fixing hole such that the notice is stretched out and fixed.

Abstract: Disclosed herein is a method of detecting fine surface defects, including: applying nano phosphor paste on a surface of a subject; squeegeeing the surface of the subject such that the nano phosphor paste remains only in defects in the subject; and detecting the fine defects in the subject by placing the subject over a light detection plate, irradiating the subject with a light source, and then determining that light-emitting portions detected using the light detection plate are defects in the subject. The method of detecting fine surface defects is advantageous in that the problems with the conventional methods, such as surface contamination, the difficulty in realizing uniform application of a penetrant on a subject, the limitations on the dwelling time of the penetrant and the testing temperature (surface temperature of the subject: 16˜50° C.