Abstract: The gas sensor according to an exemplary embodiment of the present invention comprises: an FET device including one or more gate electrodes; a sensor array part including a plurality of sensors, in which a first electrode of each sensor is connected to at least one gate electrode of the plurality of gate electrodes in the FET device; and a controller detecting a gas using a current between a drain-source in response to voltage changes in the gate electrode of the FET device, wherein each sensor includes: a first electrode connected to a gate electrode of the FET device; a second electrode receiving an operating voltage through a switch controlled by the controller; and a detection film interposed between the first electrode and the second electrode.

Abstract: Proposed is a hydraulic cylinder rod in which a rod eye is robustly coupled to a hybrid round rod for weight reduction. To this end, the hydraulic cylinder rod is configured with a hybrid round rod including a metal tube and a composite material round rod provided for weight reduction inside the metal tube, wherein a side of the metal tube is formed to be relatively longer than the length of the composite material round rod to thereby provide a space defined by a length difference therebetween; and a rod eye is coupled to the space.

Abstract: Proposed is a CFRP surface coating method and a hydraulic cylinder including a component coated by the method. The CFRP surface coating method can prevent damage to a CFRP surface due to thermal spray coating and increase the bonding strength between a CFRP surface and a metal coating layer formed by the thermal spray coating. To this end, the method includes: forming a mesh layer on a CFRP surface; fixing the mesh layer on the CFRP surface by impregnating a heat-resistant resin therein; and forming a metal coating layer by thermal spray coating on the fixed mesh layer in which the heat-resistant resin is impregnated.

Abstract: Proposed is a method of manufacturing a hydraulic cylinder rod, the method including the step of deriving an optimal ratio between a metal tube and a composite material round rod when preparing a hybrid round rod by inserting the composite material round rod into the metal tube in order to reduce the weight of an existing metal round rod such as a cylinder rod of a hydraulic cylinder, whereby the hybrid round rod is prepared through the step and then a rod eye is coupled to the hybrid round rod to manufacture the hydraulic cylinder rod.

Abstract: Proposed is a hydraulic cylinder rod in which a rod eye is robustly coupled to a hybrid round rod for weight reduction. To this end, the hydraulic cylinder rod is configured with a hybrid round rod including a metal tube and a composite material round rod provided for weight reduction inside the metal tube, wherein a side of the metal tube is formed to be relatively longer than the length of the composite material round rod to thereby provide a space defined by a length difference therebetween; and a rod eye is coupled to the space.

Abstract: Proposed is manufacturing method for a hybrid tube, the method including the step of deriving an optimal ratio between a metal tube and a composite material layer when manufacturing the hybrid tube in which the composite material layer is formed on an outer circumferential surface of the metal tube in order to reduce the weight of an existing metal tube such as a cylinder tube of a hydraulic cylinder. In manufacturing a hybrid tube, it is possible to derive an optimal ratio between heterogeneous materials that can achieve weight reduction while satisfying a target buckling load, thereby making it possible to reduce the weight of tubes of metal materials and apparatuses related to such tubes.

Abstract: Proposed is a method of manufacturing a hybrid round rod, the method including the step of calculating an optimal ratio between a metal round rod and a composite material layer when manufacturing the hybrid round rod in which the composite material layer is formed on an outer circumferential surface of the metal round rod, in order to reduce the weight of an existing metal round rod such as a rod of a hydraulic cylinder. As such, the optimal ratio between heterogeneous materials can be derived, so that the weight can be reduced while satisfying a target buckling load when manufacturing the hybrid round rod. Thus, the present disclosure can contribute to reduction of the weight of round rods and tubes of metal materials and the weight of related apparatuses.

Abstract: Proposed is a CFRP surface coating method and a hydraulic cylinder including a component coated by the method. The CFRP surface coating method can prevent damage to a CFRP surface due to thermal spray coating and increase the bonding strength between a CFRP surface and a metal coating layer formed by the thermal spray coating. To this end, the method includes: forming a mesh layer on a CFRP surface; fixing the mesh layer on the CFRP surface by impregnating a heat-resistant resin therein; and forming a metal coating layer by thermal spray coating on the fixed mesh layer in which the heat-resistant resin is impregnated.