Abstract: The present invention provides an electronic device having a flexible display panel wherein a user can easily fold or unfold a plurality of unit bodies to expand or contract the display area of the flexible display panel, and when the unit bodies are folded, a portion of the flexible display panel is received in the hollow unit body.

Abstract: An electronic device including: a first functional panel having a photovoltaic cell panel defined as an upper portion thereof; a second functional panel having a display panel defined as an upper portion thereof; and a linking mechanism for connecting the first functional panel and the second functional panel to each other. A mutual-orientation between the first functional panel and the second functional panel is switched between a plurality of mutual-orientations via the linking mechanism.

Abstract: A bearing steel includes 1.0 to 1.3 wt % carbon; 0.9 to 1.6 wt % silicon; 0.5 to 1.0 wt % manganese; 1.5 to 2.5 wt % nickel; 1.5 to 2.5 wt % chromium; 0.2 to 0.5 wt % molybdenum; 0.01 to 0.06 wt % aluminum; 0.01 to 0.1 wt % copper; at least one selected from the group consisting of more than 0 wt % and less than 0.38 wt % vanadium and more than 0 wt % and less than 0.02 wt % niobium; and a balance of iron.

Abstract: The present invention provides an electronic device having a flexible display panel wherein a user can easily fold or unfold a plurality of unit bodies to expand or contract the display area of the flexible display panel, and when the unit bodies are folded, a portion of the flexible display panel is received in the hollow unit body.

Abstract: An electronic device including: a first functional panel having a photovoltaic cell panel defined as an upper portion thereof; a second functional panel having a display panel defined as an upper portion thereof; and a linking mechanism for connecting the first functional panel and the second functional panel to each other. A mutual-orientation between the first functional panel and the second functional panel is switched between a plurality of mutual-orientations via the linking mechanism.

Abstract: The present invention relates to a steel composition for bearing having improved fatigue durability and a method of manufacturing the same. The steel composition comprises: an amount of about 0.08 to 1.0 wt % of carbon (C); an amount of about 0.9 to 1.6 wt % of silicon (Si); an amount greater than 0 wt % and of about 0.03 wt % or less of phosphorus (P); an amount greater than 0 wt % and of about 0.01 wt % or less of sulfur (S); an amount of about 0.01 to 0.1 wt % of copper (Cu); an amount of about 0.01 to 0.06 wt % of aluminum (Al); an amount greater than 0 wt % and of about 0.006 wt % or less of nitrogen (N); an amount greater than 0 wt % and of about 0.001 wt % or less of oxygen (O); one or more selected from the group consisting of: an amount of about 0.5 to 1.00 wt % of manganese (Mn), an amount of about 0.1 to 0.6 wt % of nickel (Ni), an amount of about 1.4 to 1.55 wt % of chromium (Cr), an amount of about 0.2 to 0.5 wt % of molybdenum (Mo), and an amount greater than 0 wt % and of about 0.

Abstract: A bearing steel includes 1.0 to 1.3 wt % carbon; 0.9 to 1.6 wt % silicon; 0.5 to 1.0 wt % manganese; 1.5 to 2.5 wt % nickel; 1.5 to 2.5 wt % chromium; 0.2 to 0.5 wt % molybdenum; 0.01 to 0.06 wt % aluminum; 0.01 to 0.1 wt % copper; at least one selected from the group consisting of more than 0 wt % and less than 0.38 wt % vanadium and more than 0 wt % and less than 0.02 wt % niobium; and a balance of iron.

Abstract: This invention relates to a method of manufacturing non-quenched and tempered steel having an ultrafine grained pearlite structure, including hot forging a steel material so as to be high-temperature compression deformed, thus obtaining a hot forged body; rapidly cooling the hot forged body to a low-temperature pearlite transformation range, thus obtaining a supercooled hot forged body; isothermally holding the supercooled hot forged body in the low-temperature pearlite transformation range so as to be isothermally transformed; and air-cooling the hot forged body; and to non-quenched and tempered steel manufactured thereby.