Abstract: The present invention relates to a device and a method for measuring skin changes caused by blue light. A device for measuring skin changes caused by blue light according to one embodiment of the present invention comprises: at least one light source for irradiating light of a blue light band at different light amounts to a plurality of test areas set on a skin area to be tested; and a control unit for detecting a minimum pigmentation point among the test areas and calculating a light amount of the corresponding test area as a minimum pigmentation dose (MPD) for blue light. In addition, the present invention relates to a blue light irradiation device for irradiating a plurality of blue light beams in order to measure skin changes caused by blue light.

Abstract: A positive electrode active material for a secondary battery which includes a nickel-based lithium composite transition metal oxide including nickel (Ni), wherein the lithium composite transition metal oxide satisfies Equation 1 and Equation 2 below 80 nm?crystallite sizeFWHM?150 nm??[Equation 1] ?size(|crystallite sizeIB?crystallite sizeFWHM|)?20??[Equation 2] wherein, in Equation 1 and Equation 2, crystallite sizeFWHM is a crystallite size obtained by calculating from X-ray diffraction (XRD) data using a full width at half maximum (FWHM) method, and crystallite sizeIB is a crystallite size obtained by calculating from XRD data using an integral breadth (IB) method.

Abstract: The method of forming a silicon oxycarbonitride film on a base includes stacking a silicon carbonitride film and a silicon oxynitride film on the base to form the silicon oxycarbonitride film.

Abstract: Disclosed is an Internet group management system of a push-type multicast in a passive access network, and a method thereof. The Internet group management system of a push-type multicast supporting Internet group management with respect to a packet stream simultaneously being transmitted to a subscriber accessing the same node via a passive access network where at least one subscriber accesses a single node, the system including an input packet classifying unit to sort a multimedia contents packet corresponding to a contents transmission packet from the packet stream, and a program managing unit to construct a broadcasting program table having information of the sorted multimedia contents packet, to determine, based on the constructed broadcasting program table, a reception condition of a requested program that is requested by a user, and to output a multimedia contents packet corresponding to the requested program.

Abstract: Provided are a video on demand (VOD) transmission/reception method and system using a divided transport stream (TS). The VOD transmission method includes setting a division coefficient for dividing a TS; dividing the TS into a unicast segment and multicast segments according to the division coefficient; and transmitting the unicast segment by using a unicast method and transmitting the multicast segments by using a multicast method.

Abstract: Disclosed is an Internet group management system of a push-type multicast in a passive access network, and a method thereof. The Internet group management system of a push-type multicast supporting Internet group management with respect to a packet stream simultaneously being transmitted to a subscriber accessing the same node via a passive access network where at least one subscriber accesses a single node, the system including an input packet classifying unit to sort a multimedia contents packet corresponding to an IPTV contents transmission packet from the packet stream, and a program managing unit to construct a broadcasting program table having information of the sorted multimedia contents packet, to determine, based on the constructed broadcasting program table, a reception condition of a requested program that is requested by a user, and to output a multimedia contents packet corresponding to the requested program.

Abstract: A film formation process is performed to form a silicon nitride film on a target substrate within a process field configured to be selectively supplied with a first process gas containing a silane family gas and a second process gas containing a nitriding gas. The method is preset to compose the film formation process of a main stage with an auxiliary stage set at one or both of beginning and ending of the film formation process. The main stage includes an excitation period of supplying the second process gas to the process field while exciting the second process gas by an exciting mechanism. The auxiliary stage includes no excitation period of supplying the second process gas to the process field while exciting the second process gas by the exciting mechanism.

Abstract: Provided are a video on demand (VOD) transmission/reception method and system using a divided transport stream (TS). The VOD transmission method includes setting a division coefficient for dividing a TS; dividing the TS into a unicast segment and multicast segments according to the division coefficient; and transmitting the unicast segment by using a unicast method and transmitting the multicast segments by using a multicast method.

Abstract: A film formation process is performed to form a silicon nitride film on a target substrate within a process field configured to be selectively supplied with a first process gas containing a silane family gas and a second process gas containing a nitriding gas. The method is preset to compose the film formation process of a main stage with an auxiliary stage set at one or both of beginning and ending of the film formation process. The main stage includes an excitation period of supplying the second process gas to the process field while exciting the second process gas by an exciting mechanism. The auxiliary stage includes no excitation period of supplying the second process gas to the process field while exciting the second process gas by the exciting mechanism.

Abstract: Provided are a method and apparatus for providing and using content advisory (CA) information on Internet contents. A method of providing CA information by using a CA information server, includes receiving a request for the CA information on a content, from an Internet Protocol television (IPTV); searching for CA information on the content; and transmitting the found CA information to the IPTV. A method of using CA information when an IPTV reproduces a content not having the CA information, according to the present invention, includes transmitting a request for CA information, to a CA information server; receiving the CA information from the CA information server; analyzing the CA information; and applying the CA information.