Abstract: The present disclosure relates to a plurality of host materials, organic electroluminescent compounds, and organic electroluminescent devices comprising the same. By comprising specific combinations of compounds according to the present disclosure as the plurality of host materials or by comprising a compound according to the present disclosure, it is possible to provide organic electroluminescent devices having improved lifespan characteristics compared to conventional organic electroluminescent devices.

Abstract: According to an embodiment of the present invention, provided is a method of synthesizing nanowires that includes the following steps of: disposing a covering inside a reaction furnace such that the covering is spaced apart by a predetermined gap from a substrate which is provided for synthesis of nanowires; heating the reaction furnace; and synthesizing nanowires by allowing a source gas to be deposited on the substrate while flowing through the gap between the substrate and the covering.

Abstract: A plasma enhanced vapor deposition apparatus includes a process chamber including a first space and a second space, a substrate holder provided in the first space and supporting a substrate, a plasma generating device combined to the process chamber and inducing plasma in the second space, an ion species screening member separating the first and second spaces from each other and filtering ion species to prevent the ion species from diffusing from the second space to the first space, a first gas supplier supplying a first process gas including a precursor gas into the first space, wherein the precursor gas includes atoms constituting a material layer deposited over the substrate, a second gas supplier supplying a second process gas including a reactive gas into the second space, and a gas discharger coupled to the process chamber and inducing a gas flow from the second space to the first space.

Abstract: According to an embodiment of the invention, provided is a method of forming a C/SiC functionally graded coating. In the embodiment, in a step of forming the C/SiC functionally graded coating, a reaction condition is controlled by feeding a larger amount of the oxygen gas at an early stage than a latter stage of the reaction so that a pure carbon film is formed on a surface of the substrate and then gradually decreasing the amount of the oxygen gas so that a SiC film having a higher concentration with an increasing distance from the surface of the substrate is formed.

Abstract: According to an embodiment of the present invention, provided is a method of synthesizing nanowires that includes the following steps of: disposing a covering inside a reaction furnace such that the covering is spaced apart by a predetermined gap from a substrate which is provided for synthesis of nanowires; heating the reaction furnace; and synthesizing nanowires by allowing a source gas to be deposited on the substrate while flowing through the gap between the substrate and the covering.

Abstract: A wall climbing robot using an Indoor Global Positioning System (IGPS) provided in a room is disclosed. The wall climbing robot includes a navigation receiver configured to receive rotating fan beams emitted from one or more navigation transmitters of the indoor global positioning system, and recognize the rotating fan beams as IGPS signals; a robot frame provided with the navigation receiver mounted; a mobile controller configured to be installed on the robot frame, and to recognize and determine its own position using the IGPS signals; and a drive mechanism configured to travel along the surfaces of the room under control of the mobile controller. The mobile controller includes a central processing unit, an input/output unit, a motion control unit, a drive control unit, a navigation control unit, a sensor signal processor, an emergency processing unit, and an alarm generator.

Abstract: A wall climbing robot using an Indoor Global Positioning System (IGPS) provided in a room is disclosed. The wall climbing robot includes a navigation receiver configured to receive rotating fan beams emitted from one or more navigation transmitters of the indoor global positioning system, and recognize the rotating fan beams as IGPS signals; a robot frame provided with the navigation receiver mounted; a mobile controller configured to be installed on the robot frame, and to recognize and determine its own position using the IGPS signals; and a drive mechanism configured to travel along the surfaces of the room under control of the mobile controller. The mobile controller includes a central processing unit, an input/output unit, a motion control unit, a drive control unit, a navigation control unit, a sensor signal processor, an emergency processing unit, and an alarm generator.