Abstract:
PURPOSE: A hybrid LED(Light Emitting Device) drive circuit is provided to reduce the size of a circuit structure by minimizing an use of a heat sink, to save energy and to convert a high efficiency power, and to supply an advantageous circuit structure for the standardization of an LED driver module. CONSTITUTION: A hybrid LED circuit comprises a filter unit(110) which removes a noise of an inputted power source; a dimming unit(120) which controls an exposure of power source; more than one hybrid LED chip(130) in which a power supply unit of a switching drive circuit mode is connected to each LED to chip-type, and in which a power source applied in each LED is controlled by each power supply unit; and a control unit(140) controlling the power source of more than one hybrid LED. [Reference numerals] (110) Filter unit; (120) Dimming unit; (140) Control unit
Abstract:
본 발명은 휴대단말기에서 위치정보의 표시를 설정하는 방법에 있어서, 현재위치의 공개범위 설정과 연관된 공개범위 설정이 요청되는 과정과, 현재위치가 포함된 지도화면을 소정 개수의 분할화면으로 분할하고, 상기 지도화면과 상기 현재위치를 함께 표시하는 과정과, 상기 표시된 지도화면과 현재위치를 통해 사용자로부터 상기 현재위치의 공개범위를 설정받아 공개범위 설정정보로 저장하는 과정을 포함한다.
Abstract:
PURPOSE: A method for supporting mobility of a mobile node in a multi-hop IP network and a network system therefor are provided to efficiently operate a wireless PAN which supports low power and low bandwidth without complex signaling for mobility in mobile nodes. CONSTITUTION: A mobile node(600) moves from a source PAN(Personal Area Network) to a target PAN. The mobile node transmits an RS(Router Solicitation) message(612) to a gateway(604) of the target PAN. The router solicitation message includes an option requesting its own profile. The mobile node receives a router advertisement message(618) from the gateway in response to the router solicitation message. The router advertisement message is a home prefix of the mobile node as the requested profile.
Abstract:
A scheduling method in a wireless communication system and a system therefor are provided to use an algorithm for multicast proportional fair scheduling developed in consideration of a multi hop network, thereby efficiently applying the method to scheduling in a multi hop system. Mobile terminals are grouped according to data requested from relay stations and proportional fair scheduling about performance values of groups are performed(320). A performance value allocated to a target group requesting specific data is transmitted to a base station(330). The base station selects and transmits candidates of performance values from the scheduling performance value(350). The relay stations calculate a different value between a case when the scheduling performance value is applied to a TG and a case when the candidate performance values are respectively applied and transmit it to the base station. The base station determines a minimum value as a performance value about the TG by summing the different values(390).
Abstract:
A method and a system for controlling packet transmission based on a transmission control protocol are provided to perform packet transmission adaptively by classifying the network state into the segmented state and differently applying the algorithm transmitting a packet according to the classified network state. A transmission terminal confirms whether retransmission timeout or 3 repetition responses occur when transmitting the packet. The transmission terminal classifies the network state into the congestion state and the bit error state based on the reciprocating time. The transmission terminal performs the first packet transmission control in the retransmission time out generation and congestion state. The transmission terminal performs the second packet transmission control in the 3 repetition response generation and congestion state. The transmission terminal performs the third packet transmission control in the retransmission time out generation and bit error state. The transmission terminal performs the fourth packet transmission control in the 3 repetition response generation and bit error state.
Abstract:
본 발명에 따른 ONU에서의 광 출력 제어장치 및 그 방법은, ONU의 UP Stream 파장의 광신호를 감시하기 위하여 OLT로 전송되는 광 출력신호를 일부를 필터링하고, 필터링된 광신호를 포토 다이오드를 통해 모니터링하게 된다. 그리고 포토 다이오드는 모니터링하는 광신호를 전기적인 신호로 변환하고, 변환된 신호를 디지털 신호로 변환한다. 이렇게 변환된 신호(광출력 ON 신호)가 설정된 시간(타임슬롯 주기)동안 지속적으로 유지되는 되는 경우 또는 ON 상태로 간주되어 있을 정도의 광 출력이 감지되는 경우 광 출력을 차단하기 위하여 레이저 다이오드의 구동을 강제적으로 오프시켜 줌으로써, 레이저 다이오드의 오동작으로 인하여 정상적으로 동작하는 다른 ONU에 미치는 영향을 차단 및 보호하여 전체 PON 시스템을 안정적으로 동작할 수 있도록 한 것이다.
Abstract:
An apparatus, computer program and method for packet buffer management in an IP network system. The apparatus includes at least one link queue buffer, a shared buffer, a buffer state detector, and a buffer manager. The at least one link queue buffer is allocated a buffer of a packet stored in a memory. The shared buffer is excessively allocated when exceeding a minimum buffer threshold value. The buffer state detector determines whether a buffer value stored in a link queue buffer of a corresponding link exceeds a preset minimum buffer threshold value. The buffer manager sets the shared buffer to be included in the link queue buffer if the stored buffer value exceeds the preset minimum buffer threshold value.
Abstract:
A system and a method for estimating the amount of traffic of each flow of a pair of L2/L3-based routers are provided to enhance extendibility of the size of a network, and effectively cope with a traffic management by accurately estimating the amount of traffic. A plurality of RFC routers generate or consume traffic. An RFR router transmits a packet to the plurality of RFC routers. An SNMP(Simple Network Management Protocol) server receives traffic information transmitted after being measured by each RFC router, and configures information about a traffic distribution of an overall network. Each RFC router receives a data packet from a client, generates an FIP(Flow Information Packet) for estimating information about a received flow, and transmits the data packet and the FIP to an RFC router of a destination by way of the RFR router. The RFR router is set to have a high priority with respect to the FIP.
Abstract:
본 발명에 따른 네트워크에서의 혼잡 발생 예고 시스템 및 방법은, 네트워크에서의 혼잡이 발생하기 전에, 혼잡이 발생할 가능성이 있다고 판단되는 경우 송신 패킷량의 조절을 요청하는 혼잡 발생 예고 메시지를, 패킷을 송신하는 네트워크 구성요소에 전송함으로써 패킷량을 조절하며, 이를 통해 네트워크에서의 혼잡 발생 및 혼잡으로 인해 발생하는 패킷의 폐기를 방지할 수 있다.
Abstract:
A BcN(Backward congestion Notification) system and method in a network are provided to prevent generation of congestion without discarding packets, and reduce a loss of traffic between end users, thereby improving performance of data transmission between the users. A detecting unit(106) determines whether a BcN needs to be made according to the amount of received traffic, and when a BcN is required, the detecting unit(106) obtains BcN information including information about a traffic transmitter, a target of the BcN, and outputs it. A BcN unit(114) receives the BcN information and generates a BcN message by using the BcN information. The detecting unit determines whether the BcN is required or not by comparing the amount of traffic, queued in a queue, with a predetermined reference value.