Abstract: A positive active material for a rechargeable lithium battery includes a LiCoO2 particle. An interior of the particle has a layered structure and a surface of the particle has a spinel structure.

Abstract: Embodiments of the present invention provide an accelerated lifetime estimation device for predicting the lifetime of a secondary battery, and a method thereof. The accelerated lifetime estimation device can accurately estimate a normal lifetime of the secondary battery while reducing an evaluation time period of the secondary battery.

Abstract: A positive active material for a rechargeable lithium battery includes a lithium intercalation compound; and lithium titanium oxide represented by Chemical Formula 1 on the surface of the lithium intercalation compound surface. Li4-xMxTiyO12-z. ??Chemical Formula 1 In the Chemical Formula 1, 0<x?3, 1?y?5, ?0.3?z?0.3, and M is an element selected from Mg, Al, Ga, La, Tb, Gd, Ce, Pr, Nd, Sm, Ba, Sr, Ca, and combinations thereof.

Abstract: A device for analyzing a film on a surface of an electrode for a rechargeable lithium battery includes: an inert chamber capable of maintaining an inert atmosphere including controlled amounts of moisture and oxygen and including an inner space for pretreating a sample including the film on the surface of the electrode; a first analyzer coupled to the inert chamber through a connection tube, the first analyzer being configured to receive the sample and being configured to provide composition and thickness information of the film; an inert holder configured to be assembled around the sample in the inert chamber and configured to maintain the inert atmosphere around the sample; and a second analyzer mounted with the inert holder therein and configured to provide shape information of the film. A method of analyzing a film on a surface of an electrode using the device is also disclosed.

Abstract: A device for analyzing a film on a surface of an electrode for a rechargeable lithium battery includes: an inert chamber capable of maintaining an inert atmosphere including controlled amounts of moisture and oxygen and including an inner space for pretreating a sample including the film on the surface of the electrode; a first analyzer coupled to the inert chamber through a connection tube, the first analyzer being configured to receive the sample and being configured to provide composition and thickness information of the film; an inert holder configured to be assembled around the sample in the inert chamber and configured to maintain the inert atmosphere around the sample; and a second analyzer mounted with the inert holder therein and configured to provide shape information of the film. A method of analyzing a film on a surface of an electrode using the device is also disclosed.

Abstract: Embodiments of the present invention provide an accelerated lifetime estimation device for predicting the lifetime of a secondary battery, and a method thereof. The accelerated lifetime estimation device can accurately estimate a normal lifetime of the secondary battery while reducing an evaluation time period of the secondary battery.

Abstract: Disclosed is a positive active material for a rechargeable lithium battery, which includes an active material capable of reversibly intercalating/deintercalating lithium and lithium polysulfide.

Abstract: The present invention is related to an imidazole ring-containing compound and an organic electroluminescence (EL) display device using the same. In particular, the imidazole ring-containing compound may be used alone or in combination with a dopant as a material for organic films such as an electroluminescent layer. The organic EL display device using an organic film made of the imidazole ring-containing compound has improved characteristics such as luminance, efficiency, driving voltage, and color purity.

Abstract: An apparatus and method for converting a Media Access Control (MAC) frame in a Broadband Wireless Access (BWA) system. The apparatus includes a receiver for receiving an Ethernet MAC frame; a path searcher for extracting a MAC Service Data Unit (SDU) from the Ethernet MAC frame, checking a destination Internet Protocol (IP) address from the extracted MAC SDU, and searching an optimum route by looking up in a routing table; a frame generator for generating a MAC header which includes a MAC address of the route discovered at the path searcher, and generating a wireless MAC frame which includes the MAC header and the MAC SDU; and a transmitter for transmitting the wireless MAC frame generated at the frame generator.

Abstract: An uplink packet data transmission system and method are provided which can reduce a collision probability in a contention period by assigning a priority to mobile stations when bandwidth allocation is rejected due to lack of resources of a base station from which a best effort service is provided. In a method for transmitting best effort data in a communication system, the base station allocates resources to mobile stations for which a reservation has been made in a previous time period when bandwidth for the mobile stations requesting bandwidth allocation is insufficient, reserves bandwidth for mobile stations for which the bandwidth allocation has been rejected, and transmits reservation information. The mobile stations receive the reservation information, skip a next scheduled bandwidth allocation request, and transmit data through bandwidth allocated from the base station.

Abstract: Provided is an efficient routing method for a wireless mesh network. In a method of processing routing control messages in a source node in a wireless mesh network system including the source node having transmission data and a relay node for relaying the data from the source node, the source node determines whether it is an active node knowing a path to a gateway node, upon generation of transmission data. If the source node is an active node, it determines whether it can join one of a predetermined number of logical groups. If the source node can join the group, it determines source nodes included in the remaining groups except the group that the source node can join, and sends and receives routing control messages to and from nodes other than the determined source nodes.

Abstract: The present invention is related to an imidazole ring-containing compound and an organic electroluminescence (EL) display device using the same. In particular, the imidazole ring-containing compound has strong blue luminescence and hole transporting characteristics and may be used as a blue luminescent material and as a host of phosphorescent and fluorescent dopants in various colors such as red, green, blue, and white. In addition, an organic EL display device may be manufactured using the imidazole ring-containing compound of the present invention, which has high-efficiency luminescence characteristics and consumes less power.

Abstract: The present invention is related to an imidazole ring-containing compound and an organic electroluminescence (EL) display device using the same. In particular, the imidazole ring-containing compound may be used alone or in combination with a dopant as a material for organic films such as an electroluminescent layer. The organic EL display device using an organic film made of the imidazole ring-containing compound has improved characteristics such as luminance, efficiency, driving voltage, and color purity.