Abstract:
서버부하를줄이고보안을향상시키기위한 RFID 태그인증방법으로서, RFID 리더가, RFID DB 서버와네트워크를통해연결되고복수의태그와통신을수행할수 있으며, 태그에태그정보를요청하고, 태그로부터인덱스를갖는배열의식별자, 인덱스를갖는배열의인덱스및 암호화된태그 ID를수신한다. RFID DB 서버로부터수신한, 인덱스를갖는배열의식별자에대응하는마스터키를이용해서인덱스를갖는배열을생성하고, 인덱스에해당하는배열값을추출하여암호화키를생성하며, 생성된암호화키를이용해서암호화된태그 ID를복호화하여태그 ID를획득한다.
Abstract:
본 발명은 RF 기반의 실내 위치 추정 방법 및 장치에 관한 것으로서, 장애물이 존재하는 비가시선(Non Line of Sight, NLOS) 환경의 실내에서 장애물 속성에 따른 신호세기 정보를 기반으로 생성한 실내 환경에서의 신호감쇠모델과 거리에 따른 RF신호의 신호전달소요시간의 관계정보를 활용하여, 실내 이동 객체의 위치를 파악하도록 한다. 본 발명에 따르면, 반사나 회절로 인해 다중 경로가 발생하는 NLOS 환경요소를 고려하기 위하여 실내의 장애물 속성에 따른 수신신호세기 기반의 신호감쇠모델과 왕복전달시간 기반 거리측정모델을 활용한 위치 추정 기법을 적용함으로써, 실내 환경에서 이동하는 노드의 위치를 보다 정밀하게 추정할 수 있는 이점이 있다.
Abstract:
PURPOSE: Multi-hop radio communications method of the tree-based considering the node transition is provided to supply routing protocol applied to the network of high-mobility. CONSTITUTION: A general node has a communication state of alone of a plurality of general nodes(100). The general node sets communication establishment information based on a sink node(200) in which the general node generates a connection reply signal, the communication state and the communication level of the general node. The general node updates the communications establishment information based on the connection reply signal received from a parent node. The general node transmits data to the other general node or a server(300) based on an updated communication setting information.
Abstract:
PURPOSE: A relaying node placement device of wireless sensor network in three dimensional spaces is provided to produce the exact setting location of relay nodes using the number of additional relay nodes. CONSTITUTION: An operation unit(420) outputs communication expenses between twp modes in a plurality of nodes, and communication costs between two nodes passing the spot according to the coordinate of the spot on the shortest path of two nodes. A generation unit(430) produces a MST(Minimum cost Spanning Tree) of the wireless sensor network including the communications path of each node according to communication expenses. A detection unit(440) detects the installing location of a relay node according to the coordinate of spot and minimum spanning tree of the spot.
Abstract:
PURPOSE: A sensor network modeling system is provided to perform modeling of a sensor network system in consideration of a three dimensional space communication obstacles in the three dimensional space, thereby facilitating the development of the sensor network system. CONSTITUTION: A space information editor(534) sets three dimensional space information about a building. A sensor node/gateway arranging unit(535) arranges a gateway and a sensor node in the three dimensional space information. Attribute editors(532,533) set attribute for the gateway and the sensor node. A simulation module(550) executes communication simulation for the gateway and the sensor node.
Abstract:
A dynamic reconfiguration method of a wireless sensor network and a system thereof are provided to hierarchically configure a node, thereby reducing a repeated request and transmission of unnecessary packets. When data received from a base station is a new library, a library management unit stores the received library in a library storage unit(S330). A received script file is transmitted to at least one end node through an RPC(Remote Procedure Call) server communication unit(S340,S350). Work result data is received from the end node about the script file(S380). The work result data is transmitted to the base station(S400).
Abstract:
A method for finding an adjacent node based on a request is provided to search neighboring node information only if necessary, thereby reducing a network load. A node produces and broadcasts a request packet(S200). The request packet requests an adjacent node to inform its presence. The adjacent node produces and transmits an advertisement packet informing its presence to the node(S210). The node produces and transmits a response packet to the adjacent node. The response packet informs confirming of the presence of the adjacent node.
Abstract:
A dynamic stack reallocation method in a multi-threaded operating system is provided to user memory capacity efficiently by reallocating dynamic stack. A size of stack data area, and non-data area is measured for a multi-thread(210). A renewed size of the non-data area of each stack is decided based on the size of the stack data(220). Non-data size of each stack is regularized to the newly decided size(230). The regulation of non-data area size is performed from lower stack to high stack. The stack data area is moved to the lower memory area or high memory area. The stack data should not be damaged, and overload is generated at the minimum level.
Abstract:
A sensor network monitoring device capable of changing a GUI(Graphic User Interface) component and a receiving packet type and a monitoring software reconfiguration method based on the device are provided to enable a user to easily add a GUI component of monitoring software, and additionally define the type of a receiving packet in order to receive sensor data which the newly added GUI component requires. A communication module(110) is configured for communication with the outside. A packet parsing rule generation module(210) generates a packet parsing rule to analyze a receiving packet type file where a receiving packet type is defined and to parse a newly added packet. A packet parsing module(220) parses a data packet received from the communication module(110) according to the generated rule. A sensor data management rule generation module(310) generates a sensor data management rule for analyzing a component data file to decide which information of the data packet will be delivered to each GUI component. A sensor data management module(320) classifies information received from the parsing module(220) according to the generated sensor data management rule, and delivers the classified information to the GUI components. A component unify module(410) checks whether newly added GUI components exist by analyzing a GUI component plug-in file, and unifies the newly added GUI components to display the unified components on a screen.
Abstract:
본 발명에서는 H.264 비디오 코딩 표준에 사용되는 1/4 화소 단위 움직임 예측의 속도를 향상시키기 위한 메모리 인덱싱 방법을 제공한다. 최근에 높은 부호화 효율을 갖는 H.264 비디오 표준 기술이 등장하였으나 구현시 요구되는 메모리 대역폭과 연산량의 복잡도가 높기 때문에 실시간 응용에 적용하는데 어려움이 있다. 특히 기존의 1/2 화소 단위보다 복잡도가 높은 1/4 화소 단위의 움직임 예측을 수행함으로 인해 효율적인 화소 보간 방식과 움직임 예측 방식이 요구된다. 본 발명에서는 움직임 예측 알고리즘을 고려한 1/4 단위의 화소 보간의 메모리 저장법을 통해 속도를 높이고자 한다. H.264, 메모리 인덱싱, 화소 보간