Abstract:
A RF amplifier is provided to increase linearity by varying a current provided in a bias circuit according to a change of an output power level. A main circuit(120) amplifies a RF signal(RFIN). A bias circuit(140) sets a bias condition of the main circuit. The bias circuit includes a bias resistor(RB1) for delivering a RF voltage(v-rf) from the inputted RF signal. The main circuit includes an input capacitor(CIN) which removes a DC voltage component of the inputted RF signal, an amplifying circuit which amplifies an output signal of the input capacitor, and an output capacitor(COUT) which removes a DC voltage component from the output signal of the amplifying circuit. The bias circuit includes a bias voltage generating circuit(141) which provides a bias voltage of the amplifying circuit and a bias resistor connected between the bias voltage generating circuit and the amplifying circuit.
Abstract:
The low dissipation mixed mode power amplifier is provided to extend the life time of battery by maximizing the efficiency of the maximum usage frequency region. The mixed mode power amplifier(1000) comprises the low output amplifier circuit(1100), the high power amplification circuit(1200), and the amplifier control part(950) and bias circuit(900). The low output amplifier circuit comprises the input impedance conformable part(100), the primary amplification section(200), and the first mid-stage impendence matching line(300) and low output amplifier(700). The high power amplification circuit(1200) comprises the second amplifier(400), and the second mid-stage impendence matching line(500) and high power amplifier(600).
Abstract:
A voltage controlled oscillator having a switching bias is provided to reduce flicker noise and to improve a phase noise characteristic by applying switching bias technique. An LC resonance circuit(120) oscillates a resonant frequency according to an input voltage. A loss compensation circuit(140) is composed of first and second transistors to amplify the oscillated resonant frequency. A bias circuit(160) is composed of third and fourth transistors to provide bias current to the first and second transistors. A peak detector(180) is composed of fifth and sixth transistors and third and fourth capacitors in order to detect a peak value from an oscillation waveform of the LC resonance circuit, and to apply the peak value to the third and fourth transistors of the bias circuit. A switching circuit(190) turns on/off the third and fourth circuits of the bias circuit according to the oscillation waveform.
Abstract:
An apparatus and a method for integratedly managing invasion detection rules in an IPv4 and IPv6 combined network are provided to easily re-use an already developed IPv4 and IPv6 intrusion detection system by using a framework of an invasion detection rule integrated management. A GUI(Graphic User Interface)(110) receives an intrusion detection rule from the exterior. A correlation analyzer(120) analyzes the correlation between an IPv4 and an IPv6 included in the received intrusion detection rule, and automatically converts the received intrusion detection rule by using the analyzed results. A storage unit(150) stores the correlation information between the converted intrusion detection rule and the IPv4 and the IPv6 in a corresponding database. An IPv4 intrusion detection rule manager(130) manages an intrusion detection rule of an IPv4 and transfers the intrusion detection rule of the IPv4 and the previously stored correlation information to an IPv4-based IDS(Intrusion Detection System)(20). An IPv6 intrusion detection rule manager(140) manages an intrusion detection rule of the IPv6, and transfers the intrusion detection rule of the IPv6 and the previously stored correlation information to an IPv6-based IDS(10).
Abstract:
A method for moving a file without copying data is provided to enhance whole performance with reduction of CPU load and costs for copying the data to a user area by moving the file between a source and target device with a buffer page shared in a kernel area. A file moving request is received from an application providing of the user area. The buffer page for the source device is allocated in the kernel area(401). The data of the moved file stored in the source device is copied to the buffer page in a DMA(Direct Memory Access) mode(402). The buffer page is removed from a cache and page management information is changed to allocate the buffer page to the target device(405). The data of the buffer page is copied to the target device in the DMA mode(406).
Abstract:
A method of blocking network attacks using information included in a packet, and an apparatus thereof are provided. The method includes: receiving a packet containing information on the packet including at least information on a source from which the packet is sent, and information on a destination to which the packet is sent; and extracting the information on the packet included in the packet, comparing the information with a predetermined access control condition, and blocking or passing the packet. By doing so, a packet being transferred with a routing header capable of bypassing a security device as in an Internet Protocol version 6 (IPv6) network can be appropriately blocked or passed. Accordingly, security problems caused by the routing header can be overcome, and as a result, usage of the routing header can be promoted. Also, since a routing header can be used for transmitting a packet along a desired path, the routing header can be widely used without security problems, and can ease network security concerns relating to IPv6 networks that are expected to come into increasingly wide use.
Abstract:
An apparatus and a method for preventing conflict of addresses are provided to previously prevent possibility of the address conflict which can be generated when a stateful address autoconfiguration technique and a stateless address autoconfiguration technique are simultaneously provided in the IPv6(Internet Protocol version 6) network environment and when an arbitrary address is manually configured instead of the stateless address autoconfiguration technique, thereby preventing the conflict during network connection of various mobile terminals and home appliances through the stateless address autoconfiguration technique. An apparatus(100) for preventing conflict of addresses comprises the followings: a receiver(110) for receiving a packet if the packet includes an NS(Neighbor Solicitation) message for confirming whether the addresses is used or not on the basis of a header of the packet received by using a promiscuous mode; a uniqueness determiner(120) for determining whether an address, which is included within the received NS message and will be used, is consistent with N number of fixed addresses; and a conflict informer(130) which transmits an NA(Neighbor Advertisement) message showing that the address, which will be used, is redundant if the address which will be used is consistent with an address, which is not configured yet, among the N number of fixed addresses.
Abstract:
A variable gain amplifier and a variable gain amplifying module are provided to reduce power consumption and an area, and to control a gain precisely by connecting to a filter through a simple configuration using a transconductor. A variable gain amplifier includes an operational transconductance amplifier(121), a first variable resistor(122), and a second variable resistor(123). The first variable resistor(122) is connected between a non-inverse input terminal and an inverse output terminal of the operational transconductance amplifier(121). A resistance value of the first variable resistor(122) is changed in an exponential function by an external control voltage. The second variable resistor(123) is connected between a non-inverse input terminal and an inverse output terminal of the operational transconductance amplifier(121). A resistance value of the second variable resistor(123) is changed in an exponential function by an external control voltage.
Abstract:
1. 청구범위에 기재된 발명이 속한 기술분야 본 발명은 전압 제어 발진 장치 및 그를 이용한 튜닝 시스템에 관한 것임. 2. 발명이 해결하려고 하는 기술적 과제 본 발명은, 종래의 전압 제어 발진 장치와 달리 발진을 일으키기 위하여 고정된 차동 입력 전압을 인가하지 않고 두 개의 수동 저항과 능동 저항(제 1 트랜스컨덕터로 구현)으로 구성된 입력전압 생성수단을 통해 트랜스컨덕턴스 제어신호(Vc)에 따라 가변 가능한 차동 DC(direct current) 입력 전압을 생성하고 이를 제 2 트랜스컨덕터로 인가되도록 함으로써, 설계 환경 변화에 대한 영향을 최소화하고 트랜스컨덕턴스(gm)를 고속으로 제어하기 위한, 전압 제어 발진 장치 및 그를 이용한 튜닝 시스템을 제공하는데 그 목적이 있음. 3. 발명의 해결방법의 요지 본 발명은, 전압 제어 발진 장치에 있어서, 캐스코드(Cascode) 구조로 연결된 두 개의 수동 저항과 한 개의 트랜스컨덕터를 구비하여 외부로부터 입력받은 트랜스컨덕턴스 제어전압(Vc)에 따라 가변되는 두 개의 차동 DC(direct current) 입력 전압(VH, VL)을 생성하기 위한 입력전압 생성수단; 상기 입력전압 생성수단에서 생성한 차동 DC 입력 전압(VH, VL)을 입력전압 선택 제어신호( )에 따라 선택하여 적분수단에 지속적으로 교차하여 인가하기 위한 입력전압 선택수단; 상기 트랜스컨덕턴스 제어전압(Vc)의 반전 신호와 상기 입력전압 선택수단으로부터 전달받은 차동 DC 입력 전압의 전압차(VH-VL)에 따라 차동 출력 전류를 발생시켜 충방전하기 위한 상기 적분수단; 및 상기 적분수단에서 충방전한 두 개의 적분 전압을 비교·판단하여 입력전압 선택 제어신호( )를 상기 입력전압 선택수단과 외부기기로 출력하기 위한 제어신호 판별/출력수단을 포함함. 4. 발명의 중요한 용도 본 발명은 디지털 클럭발생기, 주파수 합성기, 및 필터 튜닝 장치 등에 이용됨. 트랜스컨덕터, 트랜스컨덕턴스(gm), 차동 DC 입력 전압 생성, 전압 제어 발진 장치, 튜닝 시스템, 클럭발생기, 능동 필터
Abstract:
본 발명은 온디맨드 어플리케이션을 이용한 단말간 동적 부하 분산 방법에 관한 것으로, 포스트 PC 시대의 편재형 컴퓨팅 환경에서 사용자 자신이 필요로하는 기능 위주로 개인화된 사무환경을 구축할 수 있어, 초고속 네트워크 기반의 다양한 단말을 통해 언제 어디서나 개인화 된 사무환경 서비스를 제공할 수 있도록 한다. 이에, 본 발명의 인터넷 기반 단말 적응형 온디맨드 어플리케이션을 이용한 단말간 동적 부하 분산 방법에 있어서, 사용자가 네트워크에 연결된 단말에서 사무환경 어플리케이션의 실행을 요구하는 경우, 사용자의 단말 성능과 네트워크 상태를 파악하는 단계와, 상기 단말의 업데이트 필요 여부를 판단하여 응용 어플리케이션 수행 환경을 갱신하는 단계와, 상기 단말 성능과 네트워크 상태에 따른 응용 어플리케이션의 수행 부하를 분담하는 단계와, 상기 수행을 분담하는 서버와 상기 단말의 데이터 및 프로세스를 동기화 하는 단계와, 서버의 가용성 및 서비스의 가용성을 높여 지속적인 서비스를 제공하기 위한 가용성 관리 프레임 워크 및 서비스 체크포인트 하는 단계 및 상기 단말의 데이터를 백업하는 단계를 포함하여 이루어진다. 온디맨드 서비스 (On-Demand Service), 동기화 (Synchronization), 체크포인트 (Checkpoint), 서비스 가용성 (Service Availability)