Abstract: An apparatus and a method for providing a streaming video by an application program are provided. A method for providing a streaming video by an application program includes a step of selecting two or more cloud game streaming videos according to a preset condition from amon11lity of cloud game streaming videos output by executing a plurality of cloud game application programs from among a plurality of cloud games, a step of generating one integrated streaming video by combining the selected two or more cloud game streaming videos such that the two or more cloud game streaming videos are output on one screen, and a step of extracting cloud game videos in respectively different progress situations corresponding to the cloud game requested to be executed by two or more user terminals from among the integrated streaming videos and providing the cloud game video to a corresponding user terminal.

Abstract: An oil pump that sucks and discharges oil, includes: a housing portion; a stator portion including an outer ring that is accommodated inside the housing portion, and a main pressing end that is formed to protrude outward from an outer circumferential surface of the outer ring; a rotor portion accommodated inside the outer ring, and sucking and discharging oil through rotation; a spring portion including a main spring that presses the stator portion; a guiding portion including a first guiding member that is installed on the outer circumferential surface of the outer ring; and a sealing portion interposed between the housing portion and a stator portion to prevent the oil flowing into the variable chamber from leaking into another space between the housing portion and the stator portion.

Abstract: A rigid polyurethane foam which is a polymerization product of a composition including a concentrated acid hydrolytic lignin, a polyol, and an isocyanate, and a method of preparing the rigid polyurethane foam.

Abstract: A method of preparing a low-molecular lignin derivative comprises the step of: preparing lignin by hydrolyzing lignocellulosic biomass with an acid; preparing a first mixture by mixing 100 parts by weight of the lignin and 500 parts or more by weight of a phenolic compound; preparing a second mixture by mixing the first mixture with a solvent including the hydrophobic polar solvent; and recovering a low-molecular lignin derivative from the second mixture.

Abstract: A rigid polyurethane foam which is a polymerization product of a composition including a concentrated acid hydrolytic lignin, a polyol, and an isocyanate, and a method of preparing the rigid polyurethane foam.

Abstract: A method of preparing a low-molecular lignin derivative comprises the step of: preparing lignin by hydrolyzing lignocellulosic biomass with an acid; preparing a first mixture by mixing 100 parts by weight of the lignin and 500 parts or more by weight of a phenolic compound; preparing a second mixture by mixing the first mixture with a solvent including the hydrophobic polar solvent; and recovering a low-molecular lignin derivative from the second mixture.