Abstract: A graphene synthesis chamber includes: a chamber case in which a substrate including a metal thin film is placed; a gas supply unit which supplies at least one gas comprising a carbon gas into an inner space of the chamber case; a main heating unit which emits at least one light to the inner space to heat the substrate; and at least one auxiliary heating unit which absorbs the at least one light and emits radiant heat toward the substrate.

Abstract: Provided are a graphene-based laminate, a method of preparing the same, and a transparent electrode and an electronic device each including the graphene-based laminate. The graphene-based laminate includes a substrate, a graphene layer including graphene and disposed on at least one surface of the substrate, and a metal oxide layer disposed on at least one surface of the graphene layer, wherein the metal oxide layer includes a metal oxide having a greater work function than that of the graphene, and the metal oxide layer includes the metal oxide in an amount of 1 ?g to 1 mg per unit area of 1 cm2 of the graphene layer.

Abstract: A fuel injection system of a gas turbine includes a first pilot nozzle injecting fuel in a first flow rate range, a second pilot nozzle injecting fuel in a second flow rate range that is greater than the first flow rate range, a main nozzle injecting fuel in a third flow rate range that is greater than the second flow rate range, a first valve opening or closing a first supply pipe fueling the second pilot nozzle, a second valve opening or closing a second supply pipe fueling the main nozzle, and a controller selectively opening any one of the first supply pipe and the second supply pipe or opening or closing both of the first supply pipe and the second supply pipe by reflecting a change in altitude and thus applying control signals to the first valve and the second valve.

Abstract: According to an aspect of the present invention, a turbine apparatus includes a shaft; a turbine disk provided on the shaft and having a plurality of protrusions protruding in a direction of the shaft; blades provided on the turbine disk; a support plate provided on the turbine disk and having a plurality of latching portions engaged with the plurality of protrusions; a plurality of first fixing blocks located between the plurality of latching portions; and a second fixing block located between the plurality of protrusions and fixed to the plurality of first fixing blocks, wherein a width of a space where the second fixing block is located, from among spaces between the plurality of protrusions, is less than a width of a space where the plurality of first fixing blocks are located, from among spaces between the plurality of latching portions.

Abstract: A graphene synthesis chamber includes: a chamber case in which a substrate including a metal thin film is placed; a gas supply unit which supplies at least one gas comprising a carbon gas into an inner space of the chamber case; a main heating unit which emits at least one light to the inner space to heat the substrate; and at least one auxiliary heating unit which absorbs the at least one light and emits radiant heat toward the substrate.

Abstract: A graphene synthesis chamber includes: a chamber case in which a substrate including a metal thin film is placed; a gas supply unit which supplies at least one gas comprising a carbon gas into an inner space of the chamber case; a main heating unit which emits at least one light to the inner space to heat the substrate; and at least one auxiliary heating unit which absorbs the at least one light and emits radiant heat toward the substrate.

Abstract: A compressor control system includes: a compressor; an inlet guide vane (IGV) arranged at an inlet of the compressor, and configured to adjust opening of the inlet based on a supplementary surge control signal or a performance control signal; an anti-surge valve (ASV) connected to an outlet of the compressor, and configured to prevent a surge based on a surge control signal; and a controller configured to generate the surge control signal for controlling the ASV when an operating point enters a surge control range, generate the supplementary surge control signal for controlling the IGV in an anti-surge mode when the operating point enters a supplementary surge control range set between the surge control range and a surge range, and generate the performance control signal for controlling the IGV in a performance mode until the operating point enters the surge control range.

Abstract: A graphene synthesis chamber includes: a chamber case in which a substrate including a metal thin film is placed; a gas supply unit which supplies at least one gas comprising a carbon gas into an inner space of the chamber case; a main heating unit which emits at least one light to the inner space to heat the substrate; and at least one auxiliary heating unit which absorbs the at least one light and emits radiant heat toward the substrate.

Abstract: A linear actuator having a free fall function. The linear actuator moves a piston-rod member back and forth using torque of a rotary motor. Here, the piston-rod member is disposed within a portion of a cylinder body to be movable back and forth. In the event of jamming in which the piston-rod member is stopped due to sticking between an operating nut and a screw member, the piston-rod member is caused to freely fall in a direction in which load is applied. This can consequently obtain the maximum stretched length of the piston-rod member, thereby providing safety in an emergency.

Abstract: According to an aspect of the present invention, there is provided a method of manufacturing a graphene film, the method including: preparing a catalyst metal having at least a surface on which graphene is formed; forming a support layer on the graphene; and isolating the graphene and the support layer from the catalyst metal by dipping the catalyst metal in an electrolytic solution perpendicularly to a liquid surface of the electrolytic solution when a voltage is applied to the catalyst metal.

Abstract: A diffuser for a compressor includes a body having a ring shape and including: a fluid inflow face extending along a radial direction of the diffuser; and a rim bent from the fluid inflow face; main vanes formed on the fluid inflow face and the rim to guide fluid; and at least one splitter vane disposed between adjacent main vanes of the main vanes to guide the fluid.

Abstract: Graphene, a composition for preparing graphene, and a method of preparing graphene using the composition are disclosed.

Abstract: Provided is a combustor assembly. The combust assembly includes: a plurality of swirlers through which a first fluid that is a part of a fluid discharged from a compressor passes; a base portion, in which the plurality of swirlers are provided, comprising a first through hole formed between one swirler and another swirler from among the plurality of swirlers so that a second fluid that is another part of the fluid discharged from the compressor and different from the first fluid passes through the first through hole; and a deflector provided in the base portion so as to face the first through hole for changing a moving direction of the second fluid.

Abstract: Provided is a camera system capable of detecting and tracking an object. The camera system includes: a camera configured to detect at least one object in a surveillance region of which an image is captured by the camera directed in a first direction and generate metadata of the object; and a camera controller configured to control at least one of panning, tilting and zooming of the camera based on the metadata of a target object selected from among the at least one object.

Abstract: Provided are an apparatus and method for processing data by detecting an event on an interrupt or polling basis according to data transmitting or receiving periods. The apparatus includes a buffer configured to store one or more wireless packets, a period determination unit configured to determine a period of transmitting or receiving the wireless packets, and a data processor configured to process data included in the wireless packets by detecting an event in a polling mode or an interrupt mode according to the period.

Abstract: A surveillance method includes: an interrupt processing operation of determining whether an interrupt is generated and determining a type of the interrupt; a type-1 interrupt processing operation of, in response to determining that the interrupt is a type-1 interrupt, determining whether an event has occurred, and, in response to determining that the event has occurred, sending an event occurrence alarm to an outside of the surveillance apparatus using a second communicator, which transmits or receives data at a second frequency, and sending an image, corresponding to the event, acquired by an image sensor to the outside using a first communicator, which transmits or receives data at a first frequency higher than the second frequency; and a type-2 interrupt processing operation of, in response to determining that the interrupt is a type-2 interrupt, controlling the surveillance apparatus according to control information included in the type-2 interrupt, wherein the type-1 interrupt is an interrupt generated a

Abstract: Provided is a network security system including: a spatial information collector configured to acquire, from a manager input terminal, spatial information; a device position receiver configured to receive, from the manager terminal, at least one device installation position with respect to the spatial information and storing the at least one device installation position; a device recommender configured to provide a candidate device list corresponding to the at least one device installation position; a device determiner configured to receive a signal for selecting at least one device from the candidate device list, and determine a model of the at least one selected device to be installed at the at least one device installation position; and a device setter configured to set a setting of the at least one selected device.

Abstract: A method of selecting hopping target channels by a device except a wireless local area network device includes: selecting candidate channels having a received signal strength less than a set threshold signal strength from among channels included in an available frequency band; classifying the candidate channels into frequency regions based on a channel frequency of each of the candidate channels; and for each of the frequency regions, selecting at least one candidate channel included in a frequency region as a hopping target channel for the frequency region.

Abstract: Provided is a turbine including a rotor; a blade provided on the rotor and comprising a cooling flow path through which a cooling fluid flows; and a shroud surrounding an exterior of the blade, wherein the blade includes: at least one rib turbulator protruding into the cooling flow path; and at least one subsidiary protrusion protruding from an outer surface of the at least one rib turbulator.