This invention relates to screed methods and building panels. To achieve the object, the technical feature of the present invention is a method of manufacturing high-strength steel with cryogenic temperature toughness. Original source material contained on an optical disk provides pre edited digitally prepared elements for user arrangement into coded sequences. The semiconductor laser light source includes a section for modulating output light emitted from its semiconductor laser, and is connected to an external FBG which has a reflection band narrower than a resonance wavelength spacing determined by the device length of the semiconductor laser. The second magnet is spaced from the first magnet to define a first gap between the second surface and the third surface. Therefore, the temperature of the catalyst reaches to a reforming-start temperature more quickly in the PSR reformers than in the other PSR reformers.