Abstract:
Disclosed is a stacked integration module having a small thickness while guaranteeing thermal and operational stabilities when operated at high frequencies. The stacked integration module includes a printed circuit board having first and second surfaces facing each other, at least one hole extending through the first and second surfaces, and a recess formed on the second surface; and a metallic member having an upper surface, the second surface of the printed circuit board being seated on the upper surface while making contact with the upper surface. The stacked integration module is simpler than conventional modules in terms of structure and process. The metallic member, which is made of a plate-shaped material having a larger area than conventional heat-radiation means, is advantageous for cooling and electromagnetic wave shielding.
Abstract:
Provided are a semiconductor package having an advantage for stacking and a stack-type semiconductor package using the semiconductor package. In one embodiment, the semiconductor package includes a wing-type substrate comprising a first surface, a second surface opposite the first surface, a chip pad area, an external terminal area on the first surface and a stack-type terminal pad on the second surface, wherein the chip pad area is lower than the external terminal area; a semiconductor chip mounted on the wing-type substrate within the chip pad area, wherein the semiconductor chip is electrically connected to the wing-type substrate; a sealing part on the wing-type substrate, the sealing part sealing the semiconductor chip and the wing-type substrate; and a conductive connecting member on the external terminal area, wherein a height of the conductive connecting member is greater than a height of the wing-type substrate.
Abstract:
A method for manufacturing shock absorbing materials using wastepaper using vacuum forming principle and wastepaper shock absorbing materials using the method are disclosed, wherein the method comprises: disintegrating wastepaper selected from at least one or more of Korea Old Corrugated Container (KOCC), Korea Old Newspaper (KONP) and milk carton, using a blender; diluting the disintegrated wastepaper to manufacture pulp suspension; mixing the pulp suspension with cationic starch; vacuum-dehydrating the pulp cationic starch mixed with the pulp suspension to a dual direction using a vacuum forming capable of dual vacuuming to manufacture a shock absorbing material; drying the shock absorbing material; and performing a surface sizing process on a surface of the dried shock absorbing material, such that a shock absorbing material having a remarkably low elastic modulus and density can be effectively manufactured without recourse to the conventional press performed by a press plate.
Abstract:
A semiconductor monolithic integrated optical transmitter including a plurality of active layers formed on a semiconductor substrate is disclosed, which comprises: a distributed feedback laser diode including a grating for reflecting light with a predetermined wavelength and a first active layer for oscillating received light from the grating; an electro-absorption modulator including a second active layer for receiving light from the first active layer, wherein the received light intensity is modulated through a change of absorbency in accordance with an applied voltage; an optical amplifier including a third active layer for amplifying received light from the second active layer; a first optical attenuator between the first active layer and the second active layer; and a second optical attenuator between the second active layer and the third active layer.
Abstract:
An electric oven with a door cooling structure includes a cavity formed in the case to provide a high temperature environment, a door for selectively opening and closing the cavity, inner, intermediate and outer panels provided in the door; an airflow shielding panel for blocking a space formed below the intermediate panel to guide introduced air upward; a door cover for blocking a top of the door, which is defined between the inner and outer panels, and a fan for applying negative pressure to gaps defined between the inner, intermediate and outer panels so that the panels can be cooled by the air flowing upward and downward in the gaps.
Abstract:
The present invention relates to a novel genomic RNA of Japanese encephalitis virus (JEV) and an infectious JEV cDNA therefrom. Particularly, the present invention relates to a full-length genomic RNA of JEV represented by SEQ. ID. No 15 and an infectious JEV cDNA therefrom. JEV genomic RNA and infectious JEV cDNA of the present invention can be used not only for the identification of the JEV genes, but also for the molecular biological studies including JEV replication, transcription, and translation. Moreover, they can also be applied to the development of the therapeutic agents, vaccines, diagnostic reagents, and diagnostic devices for Japanese encephalitis, and can be used as an expression vector for the various foreign genes.
Abstract:
A package may include a stack of unit chip packages, and each unit chip package may include a printed circuit board. The printed circuit board may support a semiconductor chip and a connection terminal for connecting to an adjacent unit chip package within the stack. A dummy package substrate may be disposed on the semiconductor chip of the uppermost unit chip package for protecting the semiconductor chip of the uppermost unit chip package. A method of fabricating a package may involve stacking unit chip packages so that the printed circuit board of a lower unit chip package abuts against a solder bump of an upper unit chip package, and stacking a dummy package substrate on the printed circuit board of an uppermost unit chip package.
Abstract:
A door of a microwave oven comprising: a door panel which is installed on a front surface of a casing having a cavity corresponding to a cooking space of food to be opened and closed; a door frame which is combined with the door panel to be located at a front of the cavity; a choke cover which is inserted in the door frame, for covering a choke seal; and a frame subsidiary plate which is positioned to opposed to the choke cover and is combined with the door frame to remove a gap formed between the choke cover and a lateral surface of the door frame.
Abstract:
A BGA package includes a semiconductor chip, and a PCB having a board body, a plurality of circuit patterns, a plurality of signal via holes, a solder resist, and a plurality of thermal emissive vias. The thermal emissive vias are holes located beneath a chip attach area, and these holes are filled with metal having a low melting point. The metal prevents moisture from being absorbed, while effectively transferring heat. The semiconductor chip is attached to the chip attach area of the PCB and is connected to circuit patterns of the PCB with bonding wires. The bonding wires and the semiconductor chip are encapsulated to protect them from external environmental stress. Solder bumps are formed on circuit patterns of the PCB. The BGA package has advantages in that it prevents moisture from penetrating to the chip through the thermal emissive vias, and effectively transfers the heat generated by the chip to the outside.
Abstract:
An apparatus for testing and adjusting audio/video signal waveforms in a color television, comprising a computer unit, a program logic controller, a measurement device, first and second interface units, a printed wiring board remote controller, an adjustment motor driving circuit, adjustment motors, an adjustment motor select circuit and an adjustment motor moving circuit. Therefore, according to the invention, the waveform test and adjustment for the printed wiring board are performed by the present apparatus, resulting in reduction in an inferiority rate and a labor cost in manufacturing the goods.