Abstract: Provided is a printed circuit board, including: a circuit pattern or a base pattern formed on an insulating layer; and a plurality of metal layers formed on the circuit pattern or the base pattern, wherein the metal layers includes: a silver metal layer formed of a metal material including silver; a first palladium metal layer formed at a lower part of the silver metal layer; and a second palladium metal layer formed at an upper part of the silver metal layer.

Abstract: A composition includes a first host compound including moieties represented by Chemical Formulae 1 to 3 that are sequentially bonded with each other, and a second host compound including at least one carbazole group with a substituent having hole characteristics,

Abstract: Provided is a printed circuit board for a memory card and a method of manufacturing the same, the printed circuit board for the memory card, including: an insulating layer; a mounting unit formed on a first surface of the insulating layer and electrically connected to a memory device; a terminal unit formed on a second surface of the insulating layer and electrically connected to electronic apparatuses of an outside; and metal layers formed at the mounting unit and the terminal unit and made of the same material.

Abstract: Disclosed are a compound for an organic optoelectronic device, an organic light emitting diode including the same, and a display device including the organic light emitting diode. The compound for an organic optoelectronic device represented by a combination of the following Chemical Formula 1 and Chemical Formula 2 provides an organic light emitting diode having life-span characteristics due to excellent electrochemical and thermal stability, and high luminous efficiency at a low driving voltage.

Abstract: A rotary bed which can be directed toward the position of the sun which rotates in accordance with the fortune of the birthday and time of birth time of a user, the oriental concept of five elements, and the flow of the physical energy of the user, to enable the head of the user to be positioned relative to the position of the sun during sleeping, thereby providing a sound sleep to the user. That is, the rotary bed comprises rotating means for rotating the bed one time per every 24 hours relative to the position of the sun. The rotary bed of the present invention, which rotates relative to the position of the sun, enables the head of the user to be positioned relative to the position of the sun during sleeping, thereby providing a sound sleep to the user.

Abstract: Provided is a structure of an air-tight reclosable processed food container in which a lid can be easily opened, can be reclosed for maintaining a remaining food, and can be checked by the user whether it has been opened or not prior to purchasing the food. The air-tight reclosable processed food container, an upper part of which is opened and includes a container body that forms a space with a bottom surface and an container wall and a lid coupled to the container body capable of being opened and closed. The container body includes a container flange formed to extend horizontally along an upper circumference of a container wall and a coupling groove is formed along an upper inner circumference of the container wall, a container leaf formed to extend downward from the container flange, and a container handle formed to extend horizontally from an arbitrary point of the container leaf.