Abstract: Proposed is a cover structure with a double cover structure and a shooting case of munition having the same. The cover structure with a double cover structure includes: a shooting case main body having an inner space with an open upper side; a cover member seated on the open upper side of the shooting case main body to seal the open upper side; and a cover fixing member coupled to the shooting case main body to fix a position of the cover member, so that the position of the cover member is strongly fixed while simplifying a structure by the double cover structure to increase an internal pressure of the shooting case, thereby increasing a range of munition and maintaining performance of munition.

Abstract: Proposed is a cover structure with a double cover structure and a shooting case of munition having the same. The cover structure with a double cover structure includes: a shooting case main body having an inner space with an open upper side; a cover member seated on the open upper side of the shooting case main body to seal the open upper side; and a cover fixing member coupled to the shooting case main body to fix a position of the cover member, so that the position of the cover member is strongly fixed while simplifying a structure by the double cover structure to increase an internal pressure of the shooting case, thereby increasing a range of munition and maintaining performance of munition.

Abstract: A coupling member that is attachable to/detachable from a housing of an electronic device while making the housing wearable on a user's body, and an electronic device including the coupling member is provided. The electronic device includes a band member that is configured to come in contact with a user's body portion, a slide member that is mounted on the band member, and is bound to a portion of the housing in a state where the coupling member is mounted on the housing, an opening that is formed in the slide member, a locking member that is disposed on the band member, and a locking protrusion that is formed on a locking member. The locking protrusion appears to the outside of the slide member through the opening according to the reciprocating of the locking member, and the coupling member is bound to the housing.

Abstract: The present disclosure relates to a polyamide-based polymer composition with superior fluidity and a polyamide-based composite material with superior mechanical strength prepared therefrom. More specifically, it relates to a polyamide-based polymer composition containing 0.1-5 parts by weight of dicyclohexylmethane bisdecanoamide, which is a cyclic compound, as a fluidity control agent based on 100 parts by weight of a mixture consisting of 20-90 wt % of a polyamide-based resin and 10-80 wt % of a reinforcing fiber, a polyamide-based composite material prepared using the same, and a method for preparing the same. The polymer composition according to the present disclosure, wherein dicyclohexylmethane bisdecanoamide is used as a fluidity control agent, provides an effect of reducing friction between a molten resin and a processing machine and greatly reducing torque by effectively dispersing a reinforcing fiber in a polyamide-based resin.

Abstract: There is provided a cold water tank including: a first tank having an inlet pipe through which water to be cooled is introduced; and a second tank provided in the interior of the first tank such that water of the first tank can be introduced thereinto, having an evaporator included in a refrigerating cycle to cool the introduced water, and having an outlet pipe through which cooled water flows. Although water is introduced at high pressure, the introduced water can remain in the cold water tank for a period of time required for being cooled, and although water is introduced at high pressure, the introduced water can be in a stable state in the cold water tank. Thus, water can be cooled with its inflow pressure maintained, and the degree of freedom of a faucet or cock for allowing cold water to flow therethrough can be improved in its height.

Abstract: The present disclosure relates to a polyamide-based polymer composition with superior fluidity and a polyamide-based composite material with superior mechanical strength prepared therefrom. More specifically, it relates to a polyamide-based polymer composition containing 0.1-5 parts by weight of dicyclohexylmethane bisdecanoamide, which is a cyclic compound, as a fluidity control agent based on 100 parts by weight of a mixture consisting of 20-90 wt % of a polyamide-based resin and 10-80 wt % of a reinforcing fiber, a polyamide-based composite material prepared using the same, and a method for preparing the same. The polymer composition according to the present disclosure, wherein dicyclohexylmethane bisdecanoamide is used as a fluidity control agent, provides an effect of reducing friction between a molten resin and a processing machine and greatly reducing torque by effectively dispersing a reinforcing fiber in a polyamide-based resin.

Abstract: A coupling member that is attachable to/detachable from a housing of an electronic device while making the housing wearable on a user's body, and an electronic device including the coupling member is provided. The electronic device includes a band member that is configured to come in contact with a user's body portion, a slide member that is mounted on the band member, and is bound to a portion of the housing in a state where the coupling member is mounted on the housing, an opening that is formed in the slide member, a locking member that is disposed on the band member, and a locking protrusion that is formed on a locking member. The locking protrusion appears to the outside of the slide member through the opening according to the reciprocating of the locking member, and the coupling member is bound to the housing.

Abstract: The present invention relates to a method for manufacturing an inner structure of a regenerative cooling type combustion chamber, and more specifically to a method for manufacturing the inner structure of the regenerative cooling type combustion chamber, including the steps of: manufacturing a cylinder structure by performing a vacuum casting process or an air casting process for a copper alloy; manufacturing a circular plate having a constant thickness by forging and rolling the cylinder structure; thermally and mechanically processing the circular plate; spinning the circular plate to manufacture the shape of the regenerative cooling type combustion chamber; and thermally processing the shape of the regenerative cooling type combustion chamber.

Abstract: A waterproof case for a portable terminal is provided.

Abstract: There is provided a cold water tank including: a first tank having an inlet pipe through which water to be cooled is introduced; and a second tank provided in the interior of the first tank such that water of the first tank can be introduced thereinto, having an evaporator included in a refrigerating cycle to cool the introduced water, and having an outlet pipe through which cooled water flows. Although water is introduced at high pressure, the introduced water can remain in the cold water tank for a period of time required for being cooled, and although water is introduced at high pressure, the introduced water can be in a stable state in the cold water tank. Thus, water can be cooled with its inflow pressure maintained, and the degree of freedom of a faucet or cock for allowing cold water to flow therethrough can be improved in its height.

Abstract: An injector head of a liquid rocket engine in which a mixture of oxidizer and fuel is supplied to a combustion chamber, including an injection plate having through-holes, a partition plate mounted above the injection plate so as to define a space between itself and the injection plate, a fuel injector which injects the fuel supplied from a fuel manifold into the combustion chamber, with an upper portion thereof engaged with a lower surface of the partition plate and a lower portion thereof inserted into the through-holes of the injection plate, and an oxidizer injector engaged with an upper surface of the partition plate so as to inject the oxidizer supplied from an oxidizer manifold, wherein the partition plate is provided with an oxidizer supply hole through which the oxidizer injected from the oxidizer injector is delivered towards the fuel injected from the fuel injector.

Abstract: Disclosed is a battery pack locking device for a portable wireless terminal which is configured to utilize a locking method in which support protrusions formed at one end of a battery pack are engaged with support grooves formed at the terminal body of the portable wireless terminal, and the battery pack is then brought into close contact with the seat surface of the terminal body, while using a button member adapted to perform a depressing operation, thereby achieving an easy separation of the battery pack from the portable wireless terminal. In accordance with the configuration, it is possible to prevent the fingernail of the user from being damaged during the attachment or detachment procedure of the battery pack. In particular, it is unnecessary to provide an additional space for allowing a horizontal movement of the locking device. Accordingly, there is an increased flexibility in the design of the terminal appearance.

Abstract: Disclosed is a cover for protecting a jack hole, into which a terminal of a microphone or a speaker in various electronic equipments, or a portable mobile telecommunication terminal device is inserted, and which is easily opened by an insertion force of a terminal into the jack hole. The jack hole cover includes a guide holder comprising a through hole for inserting the plug terminal and being fixed to the housing of the equipment, a slide cover comprising at least two pieces and being installed on the guide holder so that the pieces of the slide cover are outwardly stretched by an insertion force of the terminal, and elastic means for supporting the pieces of the slide cover prior to inserting the terminal into the through hole of the guide holder, thereby being automatically opened by inserting the terminal into the jack hole.

Abstract: Disclosed is a deflection yoke which is so configured that a coil separator and horizontal deflection coils have angular cross sectional shapes and a ferrite core and vertical deflection coils have circular cross sectional shapes to improve deflection sensitivity thereby reducing power consumption.

Abstract: Disclosed is a battery pack locking device for a portable wireless terminal which is configured to utilize a locking method in which support protrusions formed at one end of a battery pack are engaged with support grooves formed at the terminal body of the portable wireless terminal, and the battery pack is then brought into close contact with the seat surface of the terminal body, while using a button member adapted to perform a depressing operation, thereby achieving an easy separation of the battery pack from the portable wireless terminal. In accordance with the configuration, it is possible to prevent the fingernail of the user from being damaged during the attachment or detachment procedure of the battery pack. In particular, it is unnecessary to provide an additional space for allowing a horizontal movement of the locking device. Accordingly, there is an increased flexibility in the design of the terminal appearance.

Abstract: Disclosed is a cover for protecting a jack hole, into which a terminal of a microphone or a speaker in various electronic equipments, or a portable mobile telecommunication terminal device is inserted, and which is easily opened by an insertion force of a terminal into the jack hole. The jack hole cover includes a guide holder comprising a through hole for inserting the plug terminal and being fixed to the housing of the equipment, a slide cover comprising at least two pieces and being installed on the guide holder so that the pieces of the slide cover are outwardly stretched by an insertion force of the terminal, and elastic means for supporting the pieces of the slide cover prior to inserting the terminal into the through hole of the guide holder, thereby being automatically opened by inserting the terminal into the jack hole.

Abstract: Disclosed is a deflection yoke which is so configured that a coil separator and horizontal deflection coils have angular cross sectional shapes and a ferrite core and vertical deflection coils have circular cross sectional shapes to improve deflection sensitivity thereby reducing power consumption.