Abstract: A cogeneration system including an engine, which drives a generator to generate electricity, a cooling/heating unit, which comprises at least one compressor, a four-way valve, an outdoor heat exchanger, an expansion device, and an indoor heat exchanger, to establish a heat pump type refrigerant cycle, a pre-heat supplier to supply heat of cooling water used to cool the engine and heat of exhaust gas discharged from the engine to the outdoor heat exchanger, and thus, to pre-heat air passing around the outdoor heat exchanger, and a refrigerant over-heater to supply the heat of the exhaust gas discharged from the engine to an inlet of the indoor heat exchanger of the cooling/heating unit. In accordance with the cogeneration system, it is possible to maximize engine waste heat utilization, and thus, to achieve an enhancement in heating performance.

Abstract: An exhaust gas heat exchanger assembly of a cogeneration system including exhaust tubes, through which exhaust gas discharged from an engine passes, a muffler arranged between the exhaust tubes to reduce exhaust noise, and a first exhaust gas heat exchanger and a second exhaust gas heat exchanger respectively arranged at opposite sides of the muffler to perform heat exchange with the exhaust gas passing through the exhaust tubes. In accordance with the exhaust gas heat exchanger assembly, it is possible to reduce exhaust noise, and thus, to achieve a more quiet system operation. In addition, the heat exchangers are arranged in a compact state, so that it is possible to reduce the volume of the cogeneration system and to enhance the utility of the cogeneration system.

Abstract: A cogeneration system in which at least one of the heat of an engine-cooling heat exchanger and the heat of an exhaust gas heat exchanger is used in a heat consumer during a heating operation of the heat consumer, and the heat of the engine-cooling heat exchanger is transferred to a radiator to allow the transferred heat to be discharged from the radiator during a cooling operation of the heat consumer, so that it is possible to minimize the size of the radiator and the amount of air blown to the radiator, and to reduce costs and noise.

Abstract: A microwave oven has a main body including a cooking compartment, and a component compartment in which a heating component is installed. An outer casing encloses the main body A fan is provided at the component compartment corresponding to the heating component, and blows outside air to cool the heating component. An air inflow part is formed on the outer casing adjacent to the fan and through which the air from the cooling fan flows. A partitioning wall of a round shape separates the cooking compartment and the component compartment, wherein the fan is inclined with respect to the cooking compartment so that the air flowing through the air inflow part is guided toward the heating component along the partitioning wall.

Abstract: A method of fabricating an ink-jet print head includes at least one process of forming an ink feeding port. The ink feeding port forming process comprises fixing a wafer to a stage in a chamber, and processing the ink feeding port to a desired depth in the wafer using a liquid-jet guided laser. In addition, the method of fabricating the ink-jet print head includes a process of dicing a wafer in order to cut the wafer in the form of chips. The wafer dicing process comprises fixing the wafer to a stage in a chamber, and dicing the wafer using a liquid-jet guided laser. According to the present invention, the liquid-jet guided laser that combines laser and a micro liquid-jet is used when forming an ink-feeding port of a print head and/or when dicing the wafer formed with a plurality of print heads, whereby it is possible to achieve effects that a thermal damage of the print heads can be prevented, process costs can be saved, and a process time can be reduced.

Abstract: A heating cooker produces hot steam by boiling water in a cooking cavity thereof, and cooks food by use of the hot steam to prepare steamed food. The heating cooker has a cabinet to define a cooking cavity therein. A steaming vessel to contain food and water therein, is laid on a bottom wall of the cooking cavity. A heater is provided at the bottom wall of the cooking cavity to heat the bottom wall of the cooking cavity on which the steaming vessel is laid. Thus, the heater heats the water contained in the steaming vessel, so that the water is boiled to produce the hot steam.

Abstract: Disclosed is a heat exchanger including: a plurality of tubes through which refrigerants flow, the tubes being spaced away from one another; and a fin through which the tubes are perpendicularly inserted, and having a fin collar for supporting the inserted tube, a seat for supporting an outer circumference of a lower end of the fin collar, and three or more peak portions and three or more valley portions that are alternately disposed at an area defined between the tubes to cause air flow to vary at an area defined between the fin collar, heights of at least two peak portions or depths of at least two valley portions being different from each other.

Abstract: A cathode ray tube display apparatus having a fly back transformer (FBT) to induce and output high voltage, the CRT apparatus including: a power controller controlling source power input into the FBT; a DC power detector to output a shut-off signal to shut off an operation of the power controller if the DC power detector is supplied with a direct current signal. The CRT display apparatus provides for normal operation of a system while protecting circuit components from abnormal operation of the system.

Abstract: Disclosed is a heat exchanger including a plurality of tubes through which refrigerants flow, the tubes being spaced away from each other, and a plurality of fins spaced away from each other at a predetermined distance. Each of the fins has fin collars through which the tubes are perpendicularly inserted, seat portions each concentrically formed around outer circumferences of the fin collars and provided with laterally-opened front and rear portions, more than two peak portions, and more than two valley portions, the peak and valley portions being alternately disposed to provide airflow variation.

Abstract: A heating cooker produces hot steam by boiling water in a cooking cavity thereof, and cooks food by use of the hot steam to prepare steamed food. The heating cooker has a cabinet to define a cooking cavity therein. A steaming vessel to contain food and water therein, is laid on a bottom wall of the cooking cavity. A heater is provided at the bottom wall of the cooking cavity to heat the bottom wall of the cooking cavity on which the steaming vessel is laid. Thus, the heater heats the water contained in the steaming vessel, so that the water is boiled to produce the hot steam.

Abstract: An electric oven capable of cooking food in a cook-top way. The electric oven according to the present invention includes a cabinet which forms an appearance of the electric oven, a cooking cavity defined inside the cabinet and having an opening front part to contain food therein, and a heater movably mounted in the cooking cavity and moves forward from the cooking cavity through the opening front part so as to cook food in cook-top way. The heater may heat the inner part of the cooking cavity also so as to cook food in a conventional oven-cooking manner.

Abstract: An apparatus to genearate a high-voltage regulation signal to control regulation of a display, including: a pulse generator to generate a pulse; a reference signal generator to generate a reference signal with a desired duty ratio using the pulse generated from the pulse generator; and a high-voltage signal generator to generate a switching signal with a duty ratio controlled by the reference signal, according to the pulse from the pulse generator and a feedback regulation output voltage, and to generate a high-voltage regulation signal according to the switching signal, wherein the feedback regulation output voltage is based upon the high-voltage regulation signal.

Abstract: An ink-jet printhead comprising a substrate which includes an ink chamber where ink is stored, nozzles through which ink in the ink chamber is ejected, and a plurality of pads which apply an electrical signal to generate droplets in the ink chamber, a flexible printed circuit (FPC) cable which includes a conductor corresponding to each of the pads, each conductor having bonding portions at front ends thereof, and connection members which electrically connect the pads to the bonding portions.

Abstract: A bubble-jet type ink-jet printhead has a structure in which a base plate, a barrier wall, and a nozzle plate are stacked. The base plate includes a substrate on which a recess is formed to a predetermined depth, an adiabatic layer formed on the substrate, a heater which is formed on the adiabatic layer and generates a thermal energy, and a passivation layer which is formed on the heater and passivates the heater. The barrier wall is stacked on the base plate, defines an ink chamber, which is disposed on the recess and has a recessed bottom surface, and defines an ink passage which communicates with the ink chamber. The nozzle plate is stacked on the barrier wall, has nozzles through which ink is ejected, and is formed at a location corresponding to a center of the ink chamber.

Abstract: A bubble-jet type ink-jet printhead has a structure in which a base plate, a barrier wall, and a nozzle plate are stacked. The base plate includes a substrate on which a recess is formed to a predetermined depth, an adiabatic layer formed on the substrate, a heater which is formed on the adiabatic layer and generates a thermal energy, and a passivation layer which is formed on the heater and passivates the heater. The barrier wall is stacked on the base plate, defines an ink chamber, which is disposed on the recess and has a recessed bottom surface, and defines an ink passage which communicates with the ink chamber. The nozzle plate is stacked on the barrier wall, has nozzles through which ink is ejected, and is formed at a location corresponding to a center of the ink chamber.

Abstract: A surge current prevention circuit of a microwave oven, where a surge relay is turned on or turned off by a predetermined DC voltage supplied by rectification of a predetermined low voltage, such that cost of parts of the surge current prevention circuit becomes low to thereby reduce the manufacturing cost, and electricity can be decreased and operation of the microwave oven can be stabilized by the constant switching operation time of the surge relay.

Abstract: A microwave oven includes a magnetron for performing a microwave cooking function, and a separate electric heater element for performing a grilling function. A single control knob on a control panel serves to activate the magnetron and heater element, as well as selecting an output power of the magnetron. By actuating that single knob a user can select cooking operations solely by microwaves only, or solely by the heating element, or by a combination of both. A separate knob on the control panel enables a cooking time to be selected.