Abstract: A DC-DC converter includes: a switching circuit to change a voltage value of an input voltage, and to generate an output voltage; a feedback circuit connected between an output terminal to which the output voltage is supplied and a source of a first power, and to generate a feedback voltage corresponding to the output voltage; a gate pulse generator to generate a gate pulse to be supplied to the switching circuit by utilizing the feedback voltage; a current protector to control the switching circuit by utilizing the feedback voltage and the gate pulse; and a voltage protector to control the switching circuit by utilizing the feedback voltage.

Abstract: A DC-DC converter includes: a switching circuit to change a voltage value of an input voltage, and to generate an output voltage; a feedback circuit connected between an output terminal to which the output voltage is supplied and a source of a first power, and to generate a feedback voltage corresponding to the output voltage; a gate pulse generator to generate a gate pulse to be supplied to the switching circuit by utilizing the feedback voltage; a current protector to control the switching circuit by utilizing the feedback voltage and the gate pulse; and a voltage protector to control the switching circuit by utilizing the feedback voltage.

Abstract: A gamma reference voltage generator includes first and second resistors between a base voltage source and an input node, a third resistor coupled to a first node between the first resistor and the second resistor, a first transistor coupled to the input node and coupled to a first output node, a fourth resistor coupled between the first transistor and the input node, an operational amplifier coupled to the first node and coupled to a second terminal of the third resistor, a second transistor coupled to the first transistor, coupled to the second terminal of the third resistor and a second output node, and coupled to an output terminal of the operational amplifier, a fifth resistor and a first capacitor coupled in parallel between the second output node and the base voltage source, and a plurality of resistors coupled between the first output node and the second output node.

Abstract: Provided is a rail having a simple structure and capable of stably supporting a load caused by a drawer and accommodated matters. The rail has a structure having a resistance against a torsional load that twists the rail in a central direction of the drawer and configured to prevent interference between components of the rail even when the torsional load occurs.

Abstract: A retainer for a sliding device provided with a buffer member includes a body which is arranged between sliding rails, and has buffering insertion grooves on one side that are open in the outward direction, which is the withdrawal direction, and on the other side, which is the closing direction, so as to adjust the range of withdrawal when the sliding rails are withdrawn; and buffer member portions protruding from the two ends of the body, respectively, in the direction of an accommodation body, and being arranged so as to be respectively inserted into the buffering insertion grooves for coming into contact when the sliding rails are withdrawn.

Abstract: A method for providing video on demand (VoD) service of a client device is disclosed. The method includes requesting content from a server device in response to the content being selected, receiving first type data for sequential frames and second type data for non-sequential frames according to a playback time of the content from the server device, outputting the content using the first type data, and performing a skip operation for displaying a frame at a point of time corresponding to a skip command using the second type data in response to the skip command being input. The skip operation is rapidly performed.

Abstract: A movable rail body is fastened to a movable body and has a first space. Movable rail bearings are disposed in the first space at diagonally facing corners of the movable rail body. A stationary rail body is fastened to a stationary support and has a second space. Stationary rail bearings are disposed in the second space at diagonally facing corners of the stationary rail body. A slider has an upper end in rolling contact with the movable rail bearings, and a lower end in rolling contact with the stationary rail bearings. An angle between a center line parallel to the movable body and a connection line connecting centers of the movable rail bearings ranges from 40 degrees to 50 degrees. An angle between the center line and a connection line connecting centers of the stationary rail bearings ranges from 130 degrees to 140 degrees.

Abstract: Disclosed is a drawer sliding device. The drawer sliding device is configured such that when a drawer is pulled out, an intermediate rail and an inner rail are moved together. Therefore, the load support capacity of a drawer slide can be enhanced and the drawer can be smoothly pulled out. The drawer sliding device may be designed such that the intermediate rail can be extended to a position above an operating rail. In this case, the range of the operation of the automatic closing means can be increased without a reduction in the structural strength of the rail. Furthermore, in the present invention, the drawer slide is provided with the automatic closing means. Therefore, when the drawer is retracted to a predetermined range or more, the drawer can be automatically retracted to a completely closed position, and the drawer in the closed state can be prevented from being undesirably opened.

Abstract: Provided is a rail having a simple structure and capable of stably supporting a load caused by a drawer and accommodated matters. The rail has a structure having a resistance against a torsional load that twists the rail in a central direction of the drawer and configured to prevent interference between components of the rail even when the torsional load occurs.

Abstract: The present invention relates to a bottom-mounted slide. The bottom-mounted slide includes a movable member, stationary members and a ball housings. First raceways are formed in both lateral sides of the movable member. Each stationary member has second raceways which are respectively connected to the first raceways by corresponding balls to guide the movable member. The balls roll along the corresponding first and second raceways. The ball housings are provided between the movable member and each of the stationary members. The ball housings support the balls. A depressed part is provided in a predetermined portion of each of the lateral sides of the movable member between the corresponding first raceways. The depressed part is inserted into a hollow space defined inside the first raceways of the corresponding end of the movable member. Therefore, the stability can be increased by improvement of roll-forming and reduction of horizontal moment.

Abstract: A undermount-type sliding apparatus having an automatic closing device includes a movable rail provided under a receptacle and a fixed rail slidably coupled to the movable rail. A housing body is disposed on the fixed rail. A guide wall includes a curved guide portion, which has a curved shape and is spaced apart from one end of a housing space. A linear guide portion is connected to the curved guide portion. A rotary stopper is inserted into and guided by the guide wall while being caught by and released from the movable rail. An elastic member is disposed in the housing body, and is elastically coupled to the rotary stopper. In a closing operation, the rotary stopper catches the movable rail, and is thus automatically closed by elasticity. When positioned in the opening direction, the movable rail is released from the rotary stopper to enable an opening operation.

Abstract: A retainer for a sliding device provided with a buffer member includes a body which is arranged between sliding rails, and has buffering insertion grooves on one side that are open in the outward direction, which is the withdrawal direction, and on the other side, which is the closing direction, so as to adjust the range of withdrawal when the sliding rails are withdrawn; and buffer member portions protruding from the two ends of the body, respectively, in the direction of an accommodation body, and being arranged so as to be respectively inserted into the buffering insertion grooves for coming into contact when the sliding rails are withdrawn.

Abstract: An apparatus for fixing a slide rail includes a first fixing body positioned at an edge part of one of both ends when the supporting bar is inserted therein to wrap the edge part in a shape of a looped curve by opening an inserting direction of the supporting bar and facing directions of the supporting bar, the edge part, and the fixing bar and closing the remaining parts, and a second fixing body positioned at one side facing a first supporting part corresponding to an edge part of the other one of both ends when the supporting bar is inserted therein to wrap the edge part in the shape of the looped curve by opening the inserting direction of the supporting bar and facing directions of the supporting bar, the edge part, and the fixing bar and closing the remaining parts.

Abstract: A undermount-type sliding apparatus having an automatic closing device includes a movable rail provided under a receptacle and a fixed rail slidably coupled to the movable rail. A housing body is disposed on the fixed rail. A guide wall includes a curved guide portion, which has a curved shape and is spaced apart from one end of a housing space. A linear guide portion is connected to the curved guide portion. A rotary stopper is inserted into and guided by the guide wall while being caught by and released from the movable rail. An elastic member is disposed in the housing body, and is elastically coupled to the rotary stopper. In a closing operation, the rotary stopper catches the movable rail, and is thus automatically closed by elasticity. When positioned in the opening direction, the movable rail is released from the rotary stopper to enable an opening operation.

Abstract: A movable rail body is fastened to a movable body and has a first space. Movable rail bearings are disposed in the first space at diagonally facing corners of the movable rail body. A stationary rail body is fastened to a stationary support and has a second space. Stationary rail bearings are disposed in the second space at diagonally facing corners of the stationary rail body. A slider has an upper end in rolling contact with the movable rail bearings, and a lower end in rolling contact with the stationary rail bearings. An angle between a center line parallel to the movable body and a connection line connecting centers of the movable rail bearings ranges from 40 degrees to 50 degrees. An angle between the center line and a connection line connecting centers of the stationary rail bearings ranges from 130 degrees to 140 degrees.

Abstract: The present invention relates to a bottom-mounted slide. The bottom-mounted slide includes a movable member, stationary members and a ball housing. First raceways are formed in both lateral sides of the movable member. Each stationary member has second raceways which are respectively connected to the first raceways by corresponding balls to guide the movable member. The balls roll along the corresponding first and second raceways. The ball housing is provided between the movable member and each of the stationary members. The ball housing supports the balls. A depressed part is provided in a predetermined portion of each of the lateral sides of the movable member between the corresponding first raceways. The depressed part is inserted into a hollow space defined inside the first raceways of the corresponding end of the movable member. Therefore, the stability can be increased by improvement of roll-forming and reduction of horizontal moment.

Abstract: Disclosed is a self-closing apparatus for a slide, which automatically moves a drawer to a completely closed position by tensile force of springs when the user moves the drawer toward the closed position. The self-closing apparatus includes a pair of springs, a moving pin, a moving pin guide, a plate-shaped movable member, and a fixed member. The moving pin includes a support pin portion, a support plate, and a guide protrusion. The moving pin guide includes a moving pin guide slot including a pin-receiving inlet portion and a pin engaging portion. The movable member includes a plate portion provided with a hole, a sliding rod formed integrally with the plate portion, and spring support portions. The fixed member includes a support base including spring support portions, an extension bar including movable member sliding portions and a moving pin guide portion, and a head.

Abstract: Disclosed is a tungsten film coating method using tungsten oxide powders including the steps of contacting the tungsten oxide powders with a metal substrate and carrying out thermal reduction treatment thereon at a temperature of at least 650° C. under a hydrogen atmosphere just to coat the tungsten film on the metal substrate. Accordingly, the present invention enables to provide a simple method of coating a tungsten thin film on a metal substrate using the phenomenon of tungsten migration through vapor phase when thermal reduction treatment is carried out on tungsten oxide powders without using previous chemical or physical vapor depositions requiring expensive precision equipments or causing environmental pollution.

Abstract: Disclosed is a tungsten film coating method using tungsten oxide powders including the steps of contacting the tungsten oxide powders with a metal substrate and carrying out thermal reduction treatment thereon at a temperature of at least 650° C. under a hydrogen atmosphere just to coat the tungsten film on the metal substrate. Accordingly, the present invention enables to provide a simple method of coating a tungsten thin film on a metal substrate using the phenomenon of tungsten migration through vapor phase when thermal reduction treatment is carried out on tungsten oxide powders without using previous chemical or physical vapor depositions requiring expensive precision equipments or causing environmental pollution.

Abstract: A vacuum apparatus for easily forming a vacuum in any bottle, container or the like and for providing a stable sealing. A lower cylindrical member together with a disc member forms a space portion in which a vacuum or an atmospheric pressure is applied, and the lower portion of an upper cylindrical member is inserted in the space portion and divides the space portion into upper and lower spaces. With a downward movement of the upper cylindrical member, the upper space expands and draws air inside of a bottle, and with an upward movement thereof, the air introduced into the upper space is vented outside. At this time, a check valve is selectively opened and closed and is operated by a pressure difference applied thereon. By repetitive reciprocating movement of the upper cylindrical member, a high vacuum is formed in the bottle and is sealed by the check valve. The apparatus is adaptable in a vacuum bottle, a medical suction instrument or the like.