Abstract: Provided are a method for preparing a polyetherketoneketone and a polyetherketoneketone prepared thereby, wherein, at the time of a polymerization reaction, nitrogen gas is blown into a liquid reaction medium while stirring, thereby quickly removing hydrochloric acid, which is a by-product generated during the reaction, and preventing aggregation of resin particles, thus suppressing the generation of scales.

Abstract: A portable terminal in provided. The portable terminal includes a body having a front surface, the front surface having an upper portion and a lower portion, a display unit located in the body and visible at the front surface thereof, the display unit having a first end and a second end, and at least one of the first end being adjacent the upper portion and the second end being adjacent the lower portion, and a speaker unit located in the body, the speaker unit including a bone conduction speaker.

Abstract: An operation mode conversion device, a mobile communication terminal having the same and a method for converting the operation mode are provided. According to an embodiment, a user interface element is provided with an input unit configured to generate a signal to switch a current operation mode to a selected operation mode upon being pressed by a user, the selected operation mode being set with respect to a position on the input unit, and a display area is located at a central portion of the input unit, the display area being configured to output information about the selected operation mode. The user can quickly perform menu navigation to convert the operation mode as desired, the information about the converted operation mode is conveniently viewed, and the overall size of the mobile phone can be minimized.

Abstract: A mobile communication terminal includes a first body, a second body foldably coupled to the first body, and an opening mechanism that rotates the second body with respect to the first body in response to a sliding movement of the second body.

Abstract: A portable terminal in provided. The portable terminal includes a body having a front surface, the front surface having an upper portion and a lower portion, a display unit located in the body and visible at the front surface thereof, the display unit having a first end and a second end, and at least one of the first end being adjacent the upper portion and the second end being adjacent the lower portion, and a speaker unit located in the body, the speaker unit including a bone conduction speaker.

Abstract: An operation mode conversion device, a mobile communication terminal having the same and a method for converting the operation mode are provided. According to an embodiment, a user interface element is provided with an input unit configured to generate a signal to switch a current operation mode to a selected operation mode upon being pressed by a user, the selected operation mode being set with respect to a position on the input unit, and a display area is located at a central portion of the input unit, the display area being configured to output information about the selected operation mode. The user can quickly perform menu navigation to convert the operation mode as desired, the information about the converted operation mode is conveniently viewed, and the overall size of the mobile phone can be minimized.

Abstract: A mobile communication terminal includes a first body, a second body foldably coupled to the first body, and an opening mechanism that rotates the second body with respect to the first body in response to a sliding movement of the second body.

Abstract: Vinyl group-containing diarylethene monomers and photochromic polymers made there from. The diarylethene monomers may be suitable for controlled polyermerization. Polymers formed from the diarylethene monomers may have optical properties such as, for example, optical signal control properties, photochromic properties, and/or optical reflectivity properties.

Abstract: Vinyl group-containing diarylethene monomers and photochromic polymers made there from. The diarylethene monomers may be suitable for controlled polyermerization. Polymers formed from the diarylethene monomers may have optical properties such as, for example, optical signal control properties, photochromic properties, and/or optical reflectivity properties.

Abstract: The conjugate addition of hydrocarbon equivalents to alpha,beta-unsaturated carbonyl compounds using a series of novel catalysts is described. The catalysts comprise copper(I) complexes with ligand systems comprising either tropocoronand macrocycles or N,N'-dialkylsubstituted aminotroponeimines.

Abstract: The conjugate addition of hydrocarbon equivalents to alpha,beta-unsaturated carbonyl compounds using a series of novel catalysts is described. The catalysts comprise copper(I) complexes with ligand systems comprising either tropocoronand macrocycles or N,N'-dialkylsubstituted aminotroponeimines.

Abstract: The conjugate addition of Grignard reagents to alpha, beta-unsaturated carbonyl compounds using a series of novel catalysts is described. The catalysts comprise copper(I) complexes with ligand systems comprising either tropocoronand macrocycles or N,N'-dialkylsubstituted aminotroponeimines.