Abstract:
PURPOSE: A current difference compensating apparatus and method are provided to minimize the current deviation between parallel arrays by applying a constant current feedback circuit to a light-emitting element array. CONSTITUTION: A light-emitting element array (110) comprises one or more light emitting elements. One or more constant current circuits (120) are connected to each string of the light-emitting element array and offset the current deviation of the each string. One or more constant current circuits set-up current amount which is conducted in the each string. One or more constant current circuits control the current amount which is conducted in the each string. One or more constant current circuits offset the brightness variation of the each string. [Reference numerals] (110) Light-emitting element array; (120) Constant current circuit
Abstract:
PURPOSE: A light emitting element circuit and a controlling method thereof are provided to use one light emitting element driver to output a current value suitable for a predetermined brightness to each light emitting array by setting up a setting value for each of the brightness of multiple light emitting element arrays on each light emitting element. CONSTITUTION: A light emitting circuit includes at least one light emitting element array(110) which is connected to at least one light emitting element, and a light emitting element driver(120) which judges the sensing voltage of each light emitting element array, and controls the current which is output to each light emitting element array. [Reference numerals] (110) Light emitting element array; (120) Light emitting element driver
Abstract:
PURPOSE: An error detecting circuit and method are provided to protect a base of a transistor by connecting a resistance between one or more comparators and the transistor and controlling a current applied to the base of the transistor. CONSTITUTION: A light emitting device array(220) comprises one or more strings. A detecting resistance(230) is parallely connected to the light emitting device array. A comparator(240) determines error of the light emitting device array by comparing detecting voltage applied to the detecting resistance with reference voltage. A transistor(250) outputs an error detecting signal based on a determination result of the comparator. A controller(260) stops operation of a light emitting device deriving integrated circuit when receiving the error detecting signal.
Abstract:
PURPOSE: A method for supporting communication route optimization in a 6LoWPAN based MANEMO(Mobile Ad-hoc for NEMO) environment is provided to optimize a communication route, thereby minimizing packet transmission delay. CONSTITUTION: Mobile routers(816,818,820,822) transmit an RS(Router Solicitation) message for a registration request about a moved wireless network to a gateway(814). The gateway obtains an address of the mobile router from the RS message. The gateway assigns a new address to the mobile router. The gateway transmits an RA(Router Advertisement) message to the mobile router. The mobile router obtains assigned address information and gateway address information from the RA message.
Abstract translation:目的:提供一种支持基于6LoWPAN的MANEMO(Mobile Ad-hoc for NEMO)环境中的通信路由优化的方法,以优化通信路由,从而最小化分组传输延迟。 规定:移动路由器(816,818,820,822)向网关(814)发送关于移动的无线网络的注册请求的RS(路由器请求)消息。 网关从RS消息获取移动路由器的地址。 网关为移动路由器分配一个新的地址。 网关向移动路由器发送RA(路由器通告)消息。 移动路由器从RA消息获取分配的地址信息和网关地址信息。
Abstract:
A mobility supporting method of a sensor node and a system thereof in 6LoWPAN is provided to apply proxy mobile IPv6 to 6LoWPAN environment of a multi hop environment supplying the mobility of the mobile sensor node connected by one hop unit. A sensor node(405b) recognizing an access of a mobile sensor node(400) in a proxy mobile 6LoWPAN informs the coordinator of the access of the movement sensor node. Information requested from the AAA server is received by requesting the information of the mobile sensor node to the AAA server through IPv6. The coordinator transmits the information of the movement sensor node.
Abstract:
A packet transmission method in a local area network is provided to maximize the transmission efficiency and energy saving by controlling the initial backoff value according to a duty cycle. A network device produces a packet(S301), transmits the generated packet to an MAC layer(S303), and then checks whether the other packet exists in the MAC layer or not(S305). If the network device is in the activity cycle, it sets up a backoff value as the decreasing function of a duty cycle(S309).
Abstract:
본 발명은 레퍼런스 노드와 센서 노드를 포함한 센서 네트워크에서 레퍼런스 노드의 적정 거리 결정 알고리즘을 이용한 위치 인식 방법 및 장치에 관한 것이다. 우선 사용자가 임의로 설정한 최대 오차 범위를 만족시키기 위해서 배치되어야 하는 레퍼런스 노드들의 간격을 결정하는 알고리즘을 수행하여, 레퍼런스 노드들이 위치되어야 하는 간격이 정해지고, 이와 동시에 위치 인식 테이블이 작성된다. 그러면, 센서 노드는 필요에 의해 레퍼런스 노드에 위치 정보를 요청하고, 이에 대응하여 레퍼런스 노드들로부터 전송되는 위치 인식 테이블을 포함한 위치 정보 신호를 수신하여 자신의 위치를 인식할 수 있다. 본 발명의 또 다른 실시예로서, 상기 센서 노드는 상기 위치 인식 테이블의 전송을 요청하지 않고, 레퍼런스 노드로부터 계산된 센서 노드의 위치 값을 직접 전송 받아 자신의 위치를 인식할 수 있다. 레퍼런스 노드, 센서 노드, 위치 인식 테이블, 위치 정보 요청 신호
Abstract:
A handover method using mutual authentication in a WiBro(Wireless Broadband) network and its system are provided to improve security by providing an effective handover function and mutual authentication function. When requesting handover from an SBS(Serving Base Station)(200) to a TBS(Target BS)(300), an MS(Mobile Station)(100) generates its temporary number and requests a handover from the SBS. According to the handover request of the MS, the SBS transmits a handover request message including a field for storing the temporary number of the MS to the TBS. The TBS transmits a handover response message including fields for the temporary number of the MS ciphered by using an authentication key received from an authentication server connected via a network and a certificate of the TBS to the SBS.
Abstract:
An RSVP(Resource Reservation Protocol) supporting method in an IPv4(Internet Protocol version 4)/IPv6 unified network system and a system therefor are provided to enable traffic transmitted to a dual stack host located within an IPv6 network to receive QoS(Quality of Service) from a server, thereby ensuring QoS by setup through end-to-end RSVP connection. A dual stack host(100) within an IPv6 network transmits an end-to-end QoS session connection request message to an IPv4 server(500) through a DSTM(Dual Stack Transition Mechanism) TEP(Tunnel End Point)(300)(S10-S60). The server(500) transmits an end-to-end path message to the host(100) through the TEP(300)(S70,S80). The TEP(300) transmits a path message for resource reservation to the host(100)(S90). The host(100) sends an end-to-end resource reservation request message to the server(500), so that resource reservation is set within an IPv4 network(S100,S110). The host(100) sends a resource reservation request message to the TEP(300), so that resource reservation can be set within an IPv6 network(S120).
Abstract:
An authentication system in a DSTM(Dual Stack Transition Mechanism) communication network and a method thereof are provided to efficiently solve a problem of the shortage of an IP(Internet Protocol) address such as a DoS attack by disabling the system to respond automatically. An authentication method in a DSTM communication network includes the steps of: storing at least one image file to be used in authentication of a DSTM server, and authentication values of the image files in a database(S201); transmitting the image files to a DSTM node which requests address allocation at a DSTM server(S202); if a user of the DSTM node inputs the authentication value to be checked through the received image files, transmitting the inputted authentication value and the image files to the DSTM server(S203); and performing authentication by comparing the authentication value and the image files stored in the database with the authentication value and the image files received from the DSTM node(S204,205).