Abstract:
본 발명은 신규 자기열 물질 및 그 제조방법에 관한 것으로서, 보다 상세하게는 하기 화학식 1로 표현되는 신규 자기열 물질: [화학식 1] (Gd 1-x A x ) 3 SnC (여기서, A는 La 또는 Ce이고, x는 소수이며 0 3 SnC 대비 효율이 현저히 높아서 저가, 고효율의 자기냉각장치 구현과 자기열 효과의 적용 온도 범위의 확장과 제어에 유용하게 사용될 수 있다.
Abstract:
본 발명은 전자화물과 유기구리화합물을 이용하여 제조한 저온 소결 가능한 구리입자 물질 및 그 제조 방법에 관한 것으로서, 보다 상세하게는 입자 크기가 작고 분산성이 높아 전도성 구리잉크 재료로서 유용하게 사용될 수 있 구리 나노입자, 및 전자화물을 환원제로 사용하여 유기구리화합물을 환원시켜 상기 구리 나노입자를 제조하는 방법에 관한 것이다. 본 발명은 구리의 산화가 억제되고, 평균 입자 직경이 5 nm 내외로, 융점의 강하를 일으킬 수 있으며, 분산성이 높고, 간단한 초음파처리 공정으로서 전자화물을 제거할 수 있어, 전도성 구리 나노 잉크 재료에 적합하게 사용할 수 있는 구리 나노입자를 제공하며, 제조된 구리나노 입자는 입자 크기가 작고 분산성이 높은 산화방지 보호체 또는 전도성 구리잉크 재료로서의 유용하게 사용될 수 있다.
Abstract:
PURPOSE: A multicast data transmission system utilizing location information in a wireless ad-hoc network and data transmission method thereof are provided to prevent the creation of overlapped data and to promote network performance by effectively utilizing wireless resources. CONSTITUTION: A source node acquire information of neighbor nodes(S10). The source node selects one or more intermediate nodes locates one hop distance with the source node(S20). The source node selects the intermediate node which locates to the direction of a destination node as one or more relay nodes for transmitting data(S30). The intermediate node is selected based on the location information of the destination node and the location information of the intermediate node. The intermediate node transmits the data received from the source node to the destination node(S40). [Reference numerals] (AA) Start; (BB) End; (S10) A source node acquire information of neighbor nodes; (S20) A source node selects intermediate nodes; (S30) A source node selects the intermediate node and transmits data to a relay node by considering directivity; (S40) Each relay node transmits data to the destination node by transmitting the data to the relay node of a next hop
Abstract:
A method for allocating frequency band in a wireless communication system is provided to assign data transmission frequency bandwidth to the terminal attempting communication with a base station in frequency-divided cell. A total frequency band is divided to a central frequency band and a plurality of outer frequency bands which do not overlap(S110). A first outer frequency band and the central frequency band are allocated in the central region of a first cell(S130). The first outer frequency band is allocated in the outer region of the first cell(S140). The second outer frequency band and the central frequency band are allocated in the central region of the second cell(S150). The second outer frequency band is allocated in the outer region of the second cell(S160).
Abstract:
A system and a method for estimating the number of tags and preventing tag collision are provided to recognize an RFID(Radio Frequency IDentification) tag quickly by estimating the number of RFID tags correctly in an RFID system, transmitting an RF signal in an FSA(Framed-Slotted ALOHA) mode based on the estimated number of RFID tags, and separating the colliding RFID tags in a binary tree mode. A recognizer(10) transmits an instruction message to RFID tags and receives information from the RFID tags, and a collision manager(11) recognizes collision among the RFID tags and calculates a collision probability of the RFID tags. A tag quantity estimator(12) estimates the number of RFID tags by using the collision probability. A reader controller(13) generates the instruction message, sets the size of a frame used for a recognition process depending on the number of RFID tags, and enables an RFID reader(100) to recognize the RFID tag. The RFID performing an RFID recognition process by dividing the process into a tag quantity estimation process and a recognition process, recognizes the RFID tags in a FSA mode by using the estimated number of RFID tags, and recognizes the colliding tag in a binary tree mode when collision occurs.