Abstract: The present invention discloses a refrigerator which can perform direct cooling of circulating cool air by natural convection in a freezing chamber (F) and a refrigerating chamber (R), and which can selectively perform indirect cooling of circulating cool air by forcible convection in the refrigerating chamber. It is like that, frost or condensed water formed in the refrigerating chamber (R) of the direct cooling type refrigerator does not Influence the inside of the refrigerating chamber. In addition, the refrigerator efficiently performs a defrosting operation of the refrigerating chamber (R), sanitarily performs a cooling operation, and maintains uniform cooling performance.

Abstract: The present invention discloses a method for manufacturing am ultra-hydrophilic thin film coated metal product, and an ultra-hydrophilic thin film coated metal product. In order to easily manufacture an air conditioning metal material having excellent hydrophilic performance, aging property and corrosion resistance on an industrial production scale, an HMDSO anticorrosive thin film is selectively formed on both surfaces of a metal substrate sheet, and an ultra-hydrophilic Ti—O—C group compound thin film is coated on the anticorrosive thin film. The metal substrate sheet is mechanically processed into a target shape.

Abstract: act The present invention discloses a defrost operating method for a refrigerator which performs a defrost operation by controlling operations of a compressor and a fan on the basis of a continuous operation time of the compressor and surface temperatures of evaporators to prevent frost from being formed on the evaporators, when cool air is generated in a freezing chamber and a refrigerator chamber by circulating refrigerants through a refrigeration cycle built in a refrigerator main body and forcibly circulated bX rotating the fan. The defrost operating method for the refrigerator can omit a general heater by performing the defrost operation by using the compressor and the fan. In addition, the defrost operating method for the refrigerator improves heat exchange efficiency and reduces power consumption by efficiently performing the defrost operation.

Abstract: A method and apparatus for optimizing a cross layer in an ad-hoc wireless network are provided. A link price is set using the number of packets of a queue. A flow rate is set using the link price. A channel access rank is set by comparing the link price with a link price of a neighboring node. A channel access backoff time is set based on the channel access rank. The method and apparatus for optimization may not be subject to interference and can simultaneously obtain fairness and efficiency while adaptively setting link capacities.

Abstract: A resource reservation system and a method for managing resources under consideration of the mobility of an MN are provided where an old refresh interval for an old resource reservation state is changed in response to handoff. The changed refresh interval propagates through at least one of a path supporting a corresponding session before the handoff and a path newly established due to handoff occurrence. When the handoff is completed, resources are released on a path, which is a part of the path supporting the corresponding session before the handoff and is not used due to the handoff occurrence, based on the changed refresh interval.

Abstract: A system and method for reserving resources for a Mobile Node (MN) having a plurality of wireless network interfaces in a mobile network under a multi-homed environment are provided, wherein the MN transmits query messages requesting a path be setup to a plurality of Access Routers (ARs) accessible through the wireless network interfaces, a Crossover Router Node (CRN), shared by a plurality of paths running to a CN via the ARs, selects an optimal path from among the plurality of paths using the path information set in the query messages propagated through the plurality of paths, the CRN transmits the resource reserve message through the selected optimal path, and the routers existing in the optimal path reserve resources according to the resource reserve message.

Abstract: A refrigerator with first and second chambers includes a compressor configured to compress a refrigerant, a condenser configured to condense the compressed refrigerant while cooling the refrigerant, a first evaporator configured to evaporate the refrigerant to cool the first chamber, a second evaporator configured to evaporate the refrigerant to cool the second chamber, and a valve mechanism connected to control a flow of the refrigerant relative to the evaporators in three different modes. The valve mechanism is configured to provide the refrigerant to the first evaporator and not the second evaporator in a first mode, to provide the refrigerant to the second evaporator and not the first evaporator in a second mode, and to provide the refrigerant to the first and second evaporators in a third mode. In the third mode, the refrigerant may pass the first and second evaporators sequentially or in parallel.

Abstract: A heat exchanger includes: fins formed in a wavy shape; and a tube attached with the wavy fins and bent in a zigzag shape. A contact area between the tube and the fins are maximized to thus considerably enhance heat transfer through the fins.

Abstract: The present invention discloses a refrigerator having a user avatar display function which can store avatars of each user, identify users, and display the avatars corresponding to the identified users. The refrigerator having the user avatar display function includes a photographing means for photographing images of users, a storing means for storing user information for identifying the users, and avatar information having avatars corresponding to the users and/or user information, a display means for displaying the avatars, and a control means for reading the user information, comparing the user information with the images of the users photographed by the photographing means, reading the avatar information according to the comparison result, and displaying the avatars of the users included in the read avatar information on the display means.

Abstract: A reciprocating compressor includes a driving unit (10) disposed inside a hermetic container (86) and generating a reciprocal motional force, a compression unit (10) for performing a compressing operation on a refrigerant upon receiving the reciprocal motional force generated from the driving unit (8); and a lubrication unit (12) for supplying a lubricant to each motional portion of the driving unit (8) and the compression unit (10) to perform a lubrication operation. Hydrocarbon consisting of carbon and hydrogen, a sort of natural refrigerant, is used as the refrigerant. The lubricant is a paraffin-based mineral lubricant, which is a sort of mineral oil and well harmonized with the natural refrigerant used for a refrigerator. Accordingly, a lubricating performance is improved and thus a performance of the reciprocating compressor can be enhanced.

Abstract: A method for controlling an operation of a compressor and its apparatus can easily control an operation of the compressor without a request for a high-priced operation control apparatus by operating the compressor with controlling the amount of currents flowing into a winding coil of a motor (100) of the compressor according to load capacity of the refrigerator. The apparatus includes a control unit (103) for generating a control signal for selecting a main winding coil (M) of a linear motor (100) of a compressor or an auxiliary winding coil (M2) on the basis of the load capacity of a refrigerator, and a switching unit (101) for selecting the main winding coil (M) of the linear motor (100) or the auxiliary winding coil (M2) on the basis of the control signal. Herein, the main winding coil of the linear motor (100) is divided into a plurality of auxiliary winding coils (M2).

Abstract: A coil spring in accordance with the present invention includes inner coils formed as a wire is wound plural times; and an inflection portion having a nonlinear shape and formed at an outer circumferential surface of the end coil, which is positioned toward the inner coil. When connected to other component and is constricted and relaxed to absorb an impact or a vibration transmitted from the outside, the coil spring minimizes friction generated between itself and other components so that reliability of a reciprocating compressor having the coil spring can be improved.

Abstract: A refrigerating system includes: an evaporator (2) for performing a cooling operation as a refrigerant is evaporated; a compressor (4) for compressing the refrigerant discharged from the evaporator as a mover is reciprocally moved; a condenser (86) for changing the refrigerant compressed in the reciprocating compressor to a liquid refrigerant; and a capillary tube (8) for decompressing the refrigerant discharged from the condenser and transferring it to the evaporator. Hydrocarbon consisting of carbon and hydrogen, a sort of natural refrigerant, is used as the refrigerant, and a paraffin-based lubricant, a sort of a mineral oil, is used as the lubricant, so that a lubricating performance and a performance of the refrigerating system can be improved.

Abstract: A plasma polymerizing apparatus is provided which comprises at least one chamber in which sheet to be coated can be moved continuously, at least one gas inlet supplying reactive gas into the chamber, and at least one gas outlet exhausting the reactive gas out of the chamber, wherein the gas inlet and the gas outlet are disposed on the chamber in such a way that reactive gas flows in substantially parallel with moving direction of the sheet.

Abstract: The present invention relates to an apparatus for forming polymer by DC plasma polymerization wherein a substrate is used as an electrode by applying a power to the substrate and an opposite electrode in a deposition chamber is positioned to both the surfaces of the substrate to be deposited. In addition, the present invention can acquire safety during the polymerization by insulating a main body from a substrate to which voltage is applied.

Abstract: The present invention relates to a plasma polymerizing apparatus comprises a polymerizing chamber polymerizing surface of substrates by high voltage discharge, a discharge electrode installed inside of the polymerizing chamber, an opposite electrode having a plurality of uniform edges in order to get electric field be formed uniformly on the surface of the electrode, a high voltage applying unit applying the high voltage to the electrode, a gas providing unit providing monomer gas and non-monomer gas inside of the polymerizing chamber, and a pumping unit keeping vacuum inside of the chamber. The present invention can keep the uniformity of the electrode, accordingly the high quality polymerizing film can be fabricated by keeping the uniformity of the current density, carbonation on the each part of the electrode.

Abstract: A plasma polymerizing apparatus is provided which comprises at least one chamber in which sheet to be coated can be moved continuously, at least one gas inlet supplying reactive gas into the chamber, and at least one gas outlet exhausting the reactive gas out of the chamber, wherein the gas inlet and the gas outlet are disposed on the chamber in such a way that reactive gas flows in substantially parallel with moving direction of the sheet.