Abstract:
폴리이미드 또는 폴리(이미드-아미드) 코폴리머를 포함하는 베이스 필름, 및 상기 베이스 필름의 일 표면 상에 형성된 하기 화학식 1로 표시되는 공중합체를 포함하는 코팅층을 포함하는 복합 필름, 및 상기 복합 필름을 포함하는 디스플레이 장치가 제공된다: (화학식 1)
Abstract:
PURPOSE: A molded article is provided to have an excellent optical property including the transparency, heat resistance, mechanical strength and flexibility by including a polymer layer in which the refractive index becomes gradually bigger from the surface to the inside. CONSTITUTION: A molded article comprises a polymer layer (10) including polymers (11); and inorganic particles (13) having the concentration gradient in which the concentration becomes smaller from the surface of at least one side of the polymer layer to the inside. The refractive index of the inorganic particles is greater than the refractive index of the air, and less than the refractive index of the polymer. The concentration gradient of the inorganic particles is continuous. The polymer layer has the thickness of 1-1000 micron. The concentration gradient of the inorganic particles is formed within 3 micron depth from the surface of the polymer layer.
Abstract:
PURPOSE: A poly(amide-imide) block copolymer is provided to have excellent transparency, heat resistance, and flexibility. CONSTITUTION: A poly(amide-imide) block copolymer comprises as follows: a first segment which comprises a repeating unit indicated in chemical formula 1, a repeating unit indicated in chemical formula 2, or a combination thereof; a second segment which comprises a repeating unit indicated in chemical formula 3. Each of the first and second segments has a weight average molecular weight of 500-50,000 g/mol. A whole repeating unit in the first segment and a whole repeating unit in the second segment has a molar ratio of 95:5-5:95.
Abstract:
PURPOSE: A polyamide block copolymer is provided to have excellent transparency, thermal resistance and mechanical strength, and comprises a first structure of a rigid structure and a second structure of a flexible structure. CONSTITUTION: A polyamide block copolymer comprises: a first segment comprising a repeating unit indicated in chemical formula 1 and a second repeating unit indicated in chemical formula 2; and a second segment comprising a repeating unit indicated in chemical formula 3. The weight average molecular weight of the first segment is 500-50,000 g/mol. The weight average molecular weight of the second segment is 500-50,000 g/mol. The polyamide block copolymer comprises the first segment and the second segment with the weight ratio of 1:99-60:40.
Abstract:
An apparatus and a method for handover between heterogeneous networks in a mobile communication system are provided to transmit corresponding information by using a defined event when the topology of a wireless communication network changes as a repeater or a mesh node moves in the wireless communication network, thereby enabling a terminal to perform the handover more efficiently between the heterogeneous networks. A method for processing a link event in a broadband wireless communication network comprises the following steps of: checking whether network topology changes according to the movement of a mobile repeater(600); generating a link event for the change of the link event(602); generating an MIH(Media Independent Handover) event for the change of the topology(604); transmitting changed topology configuration information to an MIH information server(606); and maintaining the latest network topology information(608).
Abstract:
A method for performing handover in a communication system is provided to enable an MS(Mobile Station) to transmit a mobile handover indication message by being allocated with uplink bandwidths in a contention-free way, thereby minimizing handover delay caused by time delay taken for allocating the uplink bandwidths. Ranging code information which includes information on a handover bandwidth request ranging code, which is used for being allocated with uplink bandwidths necessary for performing handover in a contention-free way, is received(411). If uplink bandwidth allocation is essential when the handover is performed, the uplink bandwidth allocation is requested to a serving base station by using the handover bandwidth request ranging code(413-419).