Abstract: Disclosed are semiconductor devices, electronic systems including the same, and methods of fabricating the same. The semiconductor device comprises a first gate stack structure including a first dielectric pattern and a first conductive pattern that are alternately stacked with each other, a memory channel structure including a first memory portion that penetrates the first gate stack structure, a through contact including a first through portion at a level the same as a level of the first memory portion, and a connection contact including a first connection portion at a level the same as the level of the first memory portion and the level of the first through portion. A minimum width of the first memory portion is less than a minimum width of the first through portion and a minimum width of the first connection portion.

Abstract: Provided is an organic light-emitting device including: an anode; a cathode facing the anode; two or more light-emitting layers provided between the anode and the cathode and each having a maximum light emission peak of ?500 nm (?500 nm emission layer); and a light-emitting layer provided between the two or more ?500 nm emission layers, and having a maximum light emission peak at >500 nm (>500 nm emission layer), where a distance from the anode to the ?500 nm emission layer most adjacent to the anode is 100 nm to 200 nm, the distance from the anode to the ?500 nm emission most adjacent to the cathode is three to four times the distance from the anode to the ?500 nm emission layer most adjacent to the anode, and an N-type charge generation layer including an alkali metal and a P-type charge generation layer including a material with an electron affinity of ?4.8 eV are provided between each of the ?500 nm emission layers and the emission >500 nm emission layer.

Abstract: Method of real-time file format conversion streaming disclosed. The method includes receiving a request for video content from a user terminal, selecting a service format based on a device check on the user terminal, if a file format of requested video content is MP4, based on the service format, maintaining the file format of service content to be provided, or converting the file format to FLV or HLS file format by analyzing a header data, and streaming the service content to the user terminal.

Abstract: A continuously variable valve timing device is provided and includes a cam sprocket connected with a camshaft having a plurality of cams to rotate the camshaft and an electric variable valve timing mechanism connected with the cam sprocket, and driven by an electric motor. A chain cover protects the cam sprocket and a chain system from foreign substances and an electric variable valve timing mechanism cover protects the electric variable valve timing mechanism from foreign substances. A seal ring partitions an internal space between the electric variable valve timing mechanism and the electric variable valve timing mechanism cover. In addition, a pressure maintaining device is mounted within the electric variable valve timing mechanism cover to maintain pressure formed within the internal space of the electric variable valve timing mechanism cover at about atmospheric pressure.

Abstract: Provided are a method and system for delivering a message, and a computer program therefor, the method including: receiving messages from a server to a device of a user; checking at least one feature of user features associated with the user, message features associated with the messages, device features associated with the device, and contextual features associated with the surrounding circumstances; and determining, by the device, whether or not to present at least one message among the messages to the user at a specific time or later in consideration of the at least one feature. The determining whether or not to present the message includes determining, by the device, whether or not to present the message without sending information about the at least one feature to an outside.

Abstract: A continuously variable valve timing device is provided and includes a cam sprocket connected with a camshaft having a plurality of cams to rotate the camshaft and an electric variable valve timing mechanism connected with the cam sprocket, and driven by an electric motor. A chain cover protects the cam sprocket and a chain system from foreign substances and an electric variable valve timing mechanism cover protects the electric variable valve timing mechanism from foreign substances. A seal ring partitions an internal space between the electric variable valve timing mechanism and the electric variable valve timing mechanism cover. In addition, a pressure maintaining device is mounted within the electric variable valve timing mechanism cover to maintain pressure formed within the internal space of the electric variable valve timing mechanism cover at about atmospheric pressure.

Abstract: An apparatus for preventing oil from draining in an engine oil supply system, which supplies the oil from a main gallery in an engine to diverge into a first oil pipe communicating with an intake side hydraulic lash adjuster and into a second oil pipe communicating with an exhaust side hydraulic lash adjuster, may include an adaptor installed between the first oil pipe and a main oil passage connected to the main gallery, wherein the adaptor is disposed higher than the first oil pipe so as to prevent the oil from draining back, and wherein the second oil pipe is communicated with the mail oil passage through a connection pipe.

Abstract: An apparatus for preventing oil from draining in an engine oil supply system, which supplies the oil from a main gallery in an engine to diverge into a first oil pipe communicating with an intake side hydraulic lash adjuster and into a second oil pipe communicating with an exhaust side hydraulic lash adjuster, may include an adaptor installed between the first oil pipe and a main oil passage connected to the main gallery, wherein the adaptor is disposed higher than the first oil pipe so as to prevent the oil from draining back, and wherein the second oil pipe is communicated with the mail oil passage through a connection pipe.