Abstract:
PURPOSE: A communication method in a wireless mesh network and an apparatus supporting the same are provided to increase the performance of a capacitor and improve a BER(bit error rate) of a link by minimizing MUI(multi-user interference) of a wireless mesh network based on OFDMA(orthogonal frequency-division multiple access). CONSTITUTION: The number of the other nodes is obtained(S750). A cost parameter is obtained based on BER, a capacitor, and the number of nodes(S760). A weight factor is applied to the cost parameter. The weighted link cost parameter is obtained(S770). A routing path is set up based on the minimum cost routing algorithm(S790). [Reference numerals] (S710) Measuring d_ij between nodes; (S730) SINR calculation on a receipt terminal; (S740) Link BER calculation; (S750) Measuring the number of neighboring node; (S760) Obtaining a cost parameter; (S770) Calculating weighted link cost; (S780) Determining cost between nodes?; (S790) Setting up an optimum routing path by using a Minimum cost routing algorithm
Abstract:
A method and a system for managing physical distribution by RFID(Radio Frequency IDentification) are provided to obtain correct information and improve reliability of the obtained information by linking an RFID system with a barcode system, and manage warehousing/delivery by generating RFID-barcode link information based on mapping RFID information to barcode information. A plurality of sensors(150) detects arrival/departure of a truck and information of pallets loaded in the truck. An RFID reader(130) recognizes an RFID tag(140) attached to each pallet. A controller(120) controls the sensors and the RFID reader, and receives RFID information and sensing information from the sensors and the RFID reader. An RFID physical distribution manager(110) manages distribution of the pallets by receiving the RFID information and the sensing information from the controller, and is linked with a barcode system(10). The RFID physical distribution manager includes middleware(111) filtering the RFID/sensing information and transferring a control command through the controller, a server(112) processing the filtered information and generating RFID-bard link information by mapping the RFID information to barcode information received from the barcode system, an application interface(113), and a database(114).
Abstract:
본 발명은, 무선인식 물류 관리 시스템에서, 무선인식과 바코드를 이용하여 팔렛 및 팔렛에 적재된 단품 등의 물류 관리를 위해, 다수의 센서로부터 센싱된 정보를 통해 차량의 도착 여부를 확인하여 물류 관리를 위한 활성화 상태로 전환하면, 상기 차량에 탑재된 팔렛에 대한 종류 및 수량을 관리하고, 무선인식 및 바코드 시스템과 연계하여 생성된 팔렛 태그-바코드 연계 정보를 이용하여 상기 팔렛에 대한 입/출고를 관리하며, 상기 다수의 센서로부터 센싱된 정보를 통해 상기 차량의 출발 여부를 확인한 후 대기 상태로 전환함으로써, 상품, 제품, 배송품 등의 단품을 팔렛에 적재하여 이동, 운송, 입/출고를 처리하는 과정의 생산성 향상과 함께 정확한 관리를 통해 정보 획득율을 개선시킬 수 있으며, 자동화 수준으로 물류 처리의 생산성을 높일 수 있는 효과가 있다. 무선인식(RFID), RFID 물류 관리 시스템, 바코드, RFID 리더기, 동작 센서, 비디오 센서, RFID 태그, RFID-바코드 연계 정보.
Abstract:
For routing in a wireless mobile mesh network including a plurality of nodes, a node finds a reference point by projecting its position onto an imaginary line connecting a source node and a destination node to each other and finds a destination point based on the reference point and an optimum 1-hop transmission distance - the optimum 1-hop transmission distance being set in view of the number of hops in an entire routing path and a channel state at each of the hops. One of the nodes that are not selected as a routing node on the routing path is selected as the subsequent routing node in view of the destination point and subcarrier use of each of the nodes.