Abstract:
A packet processing apparatus and a processing method thereof are provided to process various Ethernet packets without an additional process and to prevent degradation of a system line speed and to optimize usage efficiency of a network processor by changing a packet header or adding a delivery header. A packet preprocessor(120) receives data control signals generated in a receiver(110a), analyzes a second layer header of an input packet, produces a transitional header or a first delivery header, and carries out processes related to second layer including a padding eliminating function and an L2 tunnel. A packet filter(130) checks and marks Ethernet FCS(Frame Check Sequence) error, and performs filtering for MRU(Maximum Receiver Unit) packet size, Ethernet destination address and Ethernet source address based on source port, VLAN(Virtual Local Area Network) ID and Ethernet source address. A protocol translator(140) comprises modular protocol engines performing a packet processing function to various types of packets. A delivery header processor(150) removes the transitional header in the delivery header generated in the packet preprocessor and loads PPP(Point to Point Protocol) header according to each packet type.
Abstract:
본 발명은, IPv4 네트워크를 이용한 IPv6 단말 간의 통신하기 위해 제어 서버의 성능을 향상시켜서 IPv6-IPv4 전환을 수행하기 위한 방법 및 시스템에 관한 것으로서, IPv4 네트워크 내에 존재하는 서비스 단말의 증가에 따라 새로 추가된 라우터를 등록시키고, 상기 단말로부터 상기 IPv4망으로 터널생성 요청 메시지를 수신하면, 등록되어 있는 라우터들 중 상기 단말의 요청에 따른 터널을 생성하기 위한 종단 라우터를 결정하고, 상기 결정된 종단 라우터에 제어 터널생성을 요청하여 상기 종단 라우터로부터 상기 터널 생성 요청에 대한 결과를 수신하면, 이를 상기 단말로 전송함에 따라 상기 단말에서 상기 결정된 종단 라우터와의 통신을 위해 IPv6-IPv4 터널을 생성하고, 상기 제어 서버는 상기 종단 라우터와 IPv6 통신을 통해 상기 단말로 패킷을 송/수신함을 특징으로 한다. IPv6 over IPv4 전환, 제어 서버, IPv4 단말, 종단 라우터, 터널 생성.
Abstract:
A traffic analysis method and a system therefor are provided to use a network processor designed for a network only in order to collect packets from an Internet network and to generate flows, thereby increasing processing speed. Flow collecting devices(100) generate flows on the basis of packets collected from an Internet network, and outputs the generated flows. A flow mediation device(200) generates an integrated flow by merging the flows, and outputs a flow message corresponding to the integrated flow. An analysis device(300) analyzes the flow message to generate traffic statistical analysis information in accordance with each Internet application. The flow collecting devices comprise as follows. Packet extraction processors collect the packets. Flow generators generate/output the flows from the collected packets, and generate/output traffic statistical basis information based on contents of the flows.
Abstract:
본 발명은 이종 접합 바이폴라 트랜지스터 제조방법에 관한 것으로, 본 이종 접합 바이폴라 트랜지스터는 기판 상에 부컬렉터층, 컬렉터층, 베이스층, 에미터층 및 에미터 캡층을 형성하는 단계; 상기 에미터 캡층 상부에 에미터 전극을 형성하는 단계; 상기 에미터 전극 하부에 형성된 상기 에미터 캡층과 상기 에미터 층을 식각하여 상기 베이스 층을 노출시키는 단계; 상기 노출된 베이스 층 상에 베이스 전극을 형성하는 단계; 상기 베이스 전극 하부에 형성된 상기 베이스층과 상기 컬렉터층을 식각하여 상기 부컬렉터층을 노출시키는 단계; 상기 부컬렉터층 상에 컬렉터 전극을 형성하는 단계; 및 상기 부컬렉터층을 식각하는 단계; 상기 부컬렉터층이 식각된 상기 기판 전면에 절연층을 형성하는 단계; 상기 에미터 전극, 베이스 전극 및 컬렉터 전극 및 기판의 상단이 노출되도록 상기 절연층을 전면적으로 이방성 식각하는 단계; 및 일측부는 상기 기판 상에 타측부는 상기 베이스 전극에 형성되며, 이들을 연결하는 베이스 연결선을 포함하는 베이스 패드를 형성하는 단계를 포함한다. 이에 따라, 베이스패드를 베이스전극을 포함한 소자영역으로부터 분리시킴으로써, 베이스-컬렉터 커패시턴스의 증가를 제거할 수 있으며, 또한, 에어 브리지(air-bridge) 연결선 형성 기술에서 발생하는 과도한 하부식각을 제거할 수 있어 이종접합 바이폴라 트랜지스터를 안정적으로 제작할 수 있다. 이종접합 바이폴라 트랜지스터, 메사식각, 베이스 전극, 베이스 연결선, 베이스패드, 커패시턴스
Abstract:
A heterojunction bipolar transistor is provided to separate an emitter from a base by additionally using a dielectric on the lateral surface of an emitter so that a partition is formed. A sub collector layer(110), a collector layer(120), a base layer(130), an emitter layer(140) and an emitter cap layer(150) are sequentially stacked on a substrate(100). An emitter electrode(160) is formed on the emitter cap layer. A first dielectric layer is formed on both lateral surfaces of the emitter electrode. The emitter cap layer and the emitter layer are etched by using the emitter electrode as a mask so that the base layer is exposed and an emitter(170) of a mesa type is formed. A second dielectric layer is formed on the lateral surface of the first dielectric layer and the emitter of the mesa type. A base electrode(180) is formed on the exposed base layer by using the emitter electrode as a mask, self-aligned with the emitter electrode. The base layer and the collector layer can be etched to expose the sub collector layer, and a collector electrode can be formed on the sub collector.
Abstract:
A network-based robot control system in a dynamic IP address environment is provided to construct and operate a robot control server in a DHCP(Dynamic Host Configuration Protocol) environment as well as in a shared network environment so that a user can easily construct a PC-based robot control server at home. A network-based robot control system in a dynamic IP address environment consists of a robot(700), a robot control server(500), and an authentication server(100). The robot makes an authentication request for network access, and executes network access, based on a packet received according to an authentication result. The robot control server creates a virtual robot object for the robot, stores and manages information for the robot's network access, and executes an operation corresponding to a command received from the robot connected to a network. The authentication server authenticates, registers, and manages information about the robot control server which performs network access with the robot. If an authentication request packet is received from the robot, the authentication server transmits a response packet, and issues an authentication key for the robot control server. Using the authentication key, the authentication server checks an authentication result for the robot control server. Also, using the authentication key, the authentication server allocates and distributes the robot control server the robot will access.
Abstract:
A flow profile information control system for dynamically controlling upstream traffic in an IP packet network and a method thereof are provided to dynamically control upstream traffic by defining control interfaces between an access network policy control server and a terminal control server and controlling the flow profiles of subscriber terminals through the terminal control servers on the basis of the control interfaces. A flow profile information control system for dynamically controlling upstream traffic in an IP packet network comprises a subscriber DB(118), a subscriber information management server(114), and an access network policy control server(110). The subscriber DB(118) stores subscriber configuration information containing the ID and service profile information of each subscriber and the URL information of each terminal control server(112). Based on a subscriber's network access request, the subscriber information management server(114) extracts the URL information of a terminal control server(112), which manages the subscriber, from the subscriber DB(118). The access network policy control server(110) is connected with the terminal control servers(112) through control interfaces(110a,112a). Whenever a modification for the flow profile of a subscriber terminal is required, the access network policy control server(110) provides flow control data and the subscriber ID of the subscriber terminal to an associated terminal control server(112) through the control interfaces.
Abstract:
A device and a method for upgrading a system using a 2-step bootloader are provided to minimize user interference and use of a non-volatile memory when a bootloader, an OS, or an application program of an embedded system is upgraded, and perform upgrade again even if a fatal error is generated during the upgrade. The first bootloader(111) has a hardware POST(Power-On Self-Test) function and a function for setting a communication interface(120) with an external server(130) for initial system operation of the embedded system(100). The second bootloader(112) has the function for loading a kernel for executing the OS of the embedded system. If the system upgrade is needed, the first bootloader performs the system upgrade by receiving a new system image from the external server connected through the communication interface. The new system image includes at least one of the second bootloader, the kernel(113), and the application program(114).
Abstract:
본 발명은 이더넷 노드에서의 프레임 처리시간을 고려한 노드간 왕복 지연시간 측정방법 및 장치에 관한 것이다. 본 발명은 이더넷 노드간 OAM 프레임의 왕복시간을 측정하기 위한 OAM 프레임 생성을 요청하고, 타 노드로부터 수신된 OAM 루프백 프레임을 회신하기 위한 작업을 수행하는 OAM 프레임 처리부; 상기 OAM 프레임 처리부의 OAM 프레임 생성 요청에 따라서 현재 '송신시간'을 저장한 OAM 루프백 프레임을 생성하여 타 노드로 전송하고, 상기 OAM 프레임 처리부에서 회신을 위한 작업이 수행된 OAM 루프백 프레임을 전달받아 상기 OAM 루프백 프레임의 '수신처리시간'을 저장하여 상기 OAM 루프백 프레임을 전송한 노드로 회신하는 OAM 프레임 송신부; 및 타 노드로부터 수신된 OAM 루프백 프레임에 현재 '수신시간'을 저장하고 상기 OAM 루프백 프레임을 회신하기 위하여 상기 OAM 프레임 처리부로 전달하고, 타 노드로부터 회신된 OAM 루프백 프레임의 현재 '회신시간' 및 상기 T1,T2,T3를 이용하여 상기 OAM 프레임의 왕복 지연시간을 결정하는 OAM 프레임 수신부를 포함한다. 이로 인해 본 발명은 보다 정확한 왕복 지연시간을 측정할 수 있는 효과가 있다. 이더넷, OAM 루프백 프레임, 노드, 왕복지연시간
Abstract:
An RF transceiver for a millimeter wave band radar senor using an MMIC(Monolithic Microwave Integrated Circuit) is provided to enable a signal isolation block to frequency-convert a signal, transmitted from a transmission block, by using an IF of a local oscillation signal and transmit the frequency-converted signal through a band pass filter, thereby improving receive sensitivity as much as 20 to 30db. An RF transceiver for a radar senor comprises the followings: a transmission block(120) which amplifies a modulation signal and radiates the amplified modulation signal through a transmission antenna(106); a signal isolation block(122) which performs frequency conversion on a signal, transmitted from the transmission block(120), by using the IF(Intermediate Frequency) of a local oscillation signal and transmits the frequency-converted signal through a band pass filter(116); a reception block(121) which mixes an external signal, received through a receiving antenna(107), with a signal transmitted from the signal isolation block(122) and transmits the mixed signal; and an IF block(123) which receives a signal transmitted from the reception block(121), mixes the received signal with the local oscillation signal, and amplifies the mixed signal to outputs a bit signal.