Abstract: The present invention relates to a novel dispersing agent capable of uniformly dispersing a variety of carbon-based materials in different media including aqueous solvents and a preparation method thereof, and a carbon-based material-dispersed composition including the same. The dispersing agent is a mixture of a plurality of polyaromatic hydrocarbon oxides, and the mixture includes polyaromatic hydrocarbon oxide having a molecular weight of 300 to 1000 in an amount of 60% by weight or more.

Abstract: The present invention provides a method for quantitative analysis of a compound in a sample characterized in that the quantitative analysis is performed by a method of using an external standard which obtains NMR spectra of a sample and a standard substance and then compares them, and it can be applied even to an insoluble sample.

Abstract: The present invention relates to a method for analyzing the length of sulfur crosslinking bonds in a vulcanized rubber using NMR spectrum. In some embodiments, the method comprises obtaining, independently, a carbon-13 nuclear magnetic resonance (13C NMR) spectrum of a standard substance, wherein the standard substance containing carbon atoms, and a 13C NMR spectrum of the vulcanized rubber, wherein the 13C NMR spectrum of the standard substance and the 13C NMR spectrum of the vulcanized rubber are obtained under the same conditions; obtaining, independently, free induction decay (FID) amplification values of characteristic peaks in the 13C NMR spectrum of the standard substance, and FID amplification values of characteristic peaks in the 13C NMR spectrum of the vulcanized rubber; and measuring the length of sulfur crosslinking bonds in the vulcanized rubber.

Abstract: The present invention relates to a method for analyzing the length of sulfur crosslinking bonds in a vulcanized rubber using NMR spectrum.

Abstract: The present invention provides a method for quantitative analysis of a compound in a sample characterized in that the quantitative analysis is performed by a method of using an external standard which obtains NMR spectra of a sample and a standard substance and then compares them, and it can be applied even to an insoluble sample.

Abstract: Disclosed is a copolycarbonate composition including: a copolycarbonate having an aromatic polycarbonate-based first repeating unit and one or more aromatic polycarbonate-based second repeating units having siloxane bonds; and a polycarbonate, where the copolycarbonate composition has an impact strength at room temperature of 830 to 1000 J/m as measured at 23 ° C. in accordance with ASTM D256 (? inch, Notched Izod), where the one or more aromatic polycarbonate-based second repeating units having siloxane bonds include a repeating unit represented by Chemical Formula 2 and a repeating unit represented by Chemical Formula 3: and where the copolycarbonate composition satisfies the following Equation 1: 1.0682×X+0.51<Y<1.0682×X+1.2.??[Equation 1] The copolycarbonate composition provides an improved mobility.

Abstract: The present invention relates to a novel dispersing agent capable of uniformly dispersing a variety of carbon-based materials in different media including aqueous solvents and a preparation method thereof, and a carbon-based material-dispersed composition including the same. The dispersing agent is a mixture of a plurality of polyaromatic hydrocarbon oxides, and the mixture includes polyaromatic hydrocarbon oxide having a molecular weight of 300 to 1000 in an amount of 60% by weight or more.

Abstract: The copolycarbonate composition according to the present invention has characteristics that it has excellent mobility and thus is excellent in various physical properties simultaneously.

Abstract: An apparatus and method are provided for transmitting and receiving wireless data and a method of transmitting and receiving wireless data in which a frame is transmitted via one of a plurality of channels, a response frame is received via another of the channels in return for the frame, the receive sensitivity for the frame is determined based on the response frame, and a set of TXVECTOR parameters are controlled according to the determination. The apparatus includes a media access control (MAC) unit which generates a data frame, a first physical (PHY) unit which transmits a wireless signal of the data frame via a first channel, a second PHY unit which receives a control frame comprising a receive sensitivity for the wireless signal via a second channel, and a parameter control unit which adjusts a set of TXVECTOR parameters for the data frame via the first channel based on the control frame.

Abstract: A method and system varying super-frame length information in a wireless network according to characteristics of transmitted data frames and/or a channel status after a basic service set (BSS) is initiated. Characteristics of a data frame to be transmitted on a MAC layer after the BSS initiation is monitored, and if determined as a result of the monitoring that the super-frame length information needs to be changed due to a variation in a transmission duration of the data frame, the super-frame length information is changed.

Abstract: A method and apparatus are provided for detecting a device change in a wireless network environment. The method includes receiving change information of a change device transmitted through a first channel, which is different from a second channel used by a plurality of devices, which form a wireless network, to transmit or receive data; storing the received change information; and reconfiguring the wireless network using the stored change information.

Abstract: Provided is a method of searching for a wireless communication device. The method includes outputting a search signal in multiple output directions; and if a response signal for the search signal is received, mapping an identifier of a wireless communication device having transmitted the response signal and information about an output direction of the search signal.

Abstract: Provided is a lip synchronization method in a wireless A/V network. The method includes generating audio and video packets including time stamps and transmitting the audio and video packets to devices in the wireless A/V network, in which the time stamp has information indicating reproduction time points of both audio data included in the audio packet and video data included in the video packet.

Abstract: A method for data streaming in an ad-hoc wireless local area network (LAN). The method for data streaming includes receiving at least one streaming request frame that requests transmission of streaming data to at least one station, and transmitting frames containing the streaming data to at least one station with Short InterFrame Space (SIFS) interval. Streaming data is reliably transmitted in an ad-hoc wireless LAN without greatly changing existing wireless LAN standards.

Abstract: A method and system varying super-frame length information in a wireless network according to characteristics of transmitted data frames and/or a channel status after a basic service set (BSS) is initiated. Characteristics of a data frame to be transmitted on a MAC layer after the BSS initiation is monitored, and if determined as a result of the monitoring that the super-frame length information needs to be changed due to a variation in a transmission duration of the data frame, the super-frame length information is changed.