Abstract:
Disclosed is a transimpedance preamplifier with an improved bandwidth. The transimpedance preamplifier according to one embodiment of the present invention easily increases a bandwidth by reducing input resistance through addition of a feedback circuit that is connected in parallel to a regulated cascode structure. Or, the transimpedance preamplifier easily increases the bandwidth by reducing input capacitance through addition of an inductor to the regulated cascode structure.
Abstract:
A provisioning image revision management apparatus, a provisioning image revision management method, and a provisioning system using the same are disclosed. The image revision management apparatus according to the present invention comprises a command reception unit for receiving a revision management method execution command for the provisioning image; a method execution unit for executing the revision management method selected based on the execution command received in the command reception unit; and an image revision database for managing the revision information of the provisioning images. When the image revision management apparatus and the management method thereof according to the present invention are used, a work for managing a plurality of provisioning system images in the large scale cluster system can be effectively executed.
Abstract:
The present invention relates to a method and an apparatus for providing a concealed software execution environment based on virtualization which supports a secure element. Important security information provided by the secure element can be protected from being exposed by an unauthorized access when used in an actual application by configuring a domain which is operated in a closed manner, not exposed to the outside, using a domain isolation technique based on virtualization and by executing the security information such as key information provided by the secure element only within the concealed domain. [Reference numerals] (400) Secure element unit; (410) Secure element execution unit; (420) Command processing unit; (500) Opened type operating environment unit; (600) Concealed type operating environment unit; (610) Security service request management unit; (620) Security service execution unit; (630) Session management unit; (640) Secure element management unit; (650) Command transmission unit; (700) Hypervisor; (AA) Application program; (BB) Security service requesting unit
Abstract:
PURPOSE: A device for a security function of a computing system and a providing method thereof are provided to enhance security for data stored in a system and a service execution environment by executing a service requiring a security service function in a general service domain when the integrity verification of the execution environment succeeds. CONSTITUTION: A general service domain(320) executes a service and a safe service domain(310) performs the integrity verification of a service execution environment of the general service domain requesting a security service function performance. The safe service domain performs the security service function for the service according to the integrity verification result. A VM(Virtual Machine) monitor(200) separates the general service domain from the service execution environment of the safe service domain based on the same hardware device. When the integrity verification succeeds, the safe service domain performs the security service function and transmits a result of the security service function to the general service domain. [Reference numerals] (100) Hardware device; (200) Virtual machine monitor; (310) Safe service domain; (312) Security operation system; (314) Security monitoring system; (320) First general service domain; (322) First operation system; (324) First security program; (330) Second general service domain; (332) Second operation system; (334) Second security program
Abstract:
본 발명은 전원노이즈에 강인한 전압 제어 발진기 및 그를 이용한 통신 장치에 관한 것으로, 더욱 상세하게는 전원을 통해 들어오는 전원노이즈를 미리 검출해 음의 되먹임 루프를 통해 전원노이즈를 제거함으로써, 저 위상잡음 특성과 저 지터특성을 가지면서 안정적인 단일 발진주파수를 제공할 수 있도록 하기 위한, 전원노이즈에 강인한 전압 제어 발진기 및 그를 이용한 통신 장치를 제공하고자 한다. 이를 위하여, 본 발명은, 전압 제어 발진기에 있어서, 기준전압에 대해 VCO 코어 회로의 가상전원을 안정된 상태로 유지시키기 위한 레귤레이팅 수단; 및 상기 레귤레이팅 수단의 제1 트랜지스터 각각에 대응되도록 제2 트랜지스터를 구성하고, 상기 제1 및 제2 트랜지스터 각각에 의해 형성된 폐회로 루프의 음의 되먹임 상태를 이용하여 상기 가상전원의 전원노이즈를 제거하기 위한 전원노이즈 제거 수단을 포함한다. 전압 제어 발진기, 폐회로 루프, 전원노이즈, 음의 되먹임, 소스전압, 기준전압, 제거
Abstract:
PURPOSE: A memory device for the bulk unified memory, and a meta-data managing method are provided to minimize the saving space overhead of meta-data in a local node and a master node for the bulk unified memory. CONSTITUTION: A memory device for the bulk unified memory comprises the following: a CVM(collective volume memory) command tool(210) for managing a CVM, and controlling the operation of the CVM by analyzing inputted commands from users; and a CVM engine(220) configuring the CVM, initializing, or allocating or accessing the CVM by data transferred from the CVM command tool.
Abstract:
PURPOSE: Personalized service providing system and method are provided to maintain anonymity and to offer personalized service by adding an approval function for supporting personalized service to an authentication function using signature. CONSTITUTION: A service providing server(30) requests an attribute certificate according to service request, confirming the validity of the attribute certificate, and determines the offer of the service. An anonymous authentication server(11) provides the anonymous information of a user in response to request. An attribute issuance server(20) transmits the request for issuing attribute certificate of a user terminal(40) to an anonymous certificate server.
Abstract:
PURPOSE: An anonymity authentication and qualification verification method is provided to accomplish authentication on the basis of a short group signature scheme offering anonymity. CONSTITUTION: A user terminal(120) selects a random number as a personal key. In case the personal key ownership verification information of the user terminal is effective, a group management server(110) issues a signature key for the user terminal through a master secret key. The group management server issues a qualification certificate for the user terminal through the issued signature key. A service providing server(130) performs authentication and qualification verification for the user terminal.
Abstract:
본 발명에 따른 알에프 증폭기는, 알에프 신호를 증폭하는 증폭회로, 상기 증폭회로의 바이어스 전압을 제공하는 바이어스 전압 발생회로, 및 상기 증폭회로 및 상기 바이어스 전압 발생회로 사이에 연결되고, 상기 알에프 신호에 의해 상기 바이어스 전압이 영향을 받도록 결정된 저항값을 갖는 제 1 바이어스 저항을 포함한다. RF 증폭기, 선형, 바이어스 회로
Abstract:
PURPOSE: An apparatus for managing information security of a wireless terminal and a method thereof are provided to prevent important information stored in the wireless terminal from being leaked to an external USB terminal. CONSTITUTION: A signature information DB(330) stores a critical information signature about the of a wireless terminal(100) and an external device(200). A security management unit(320) analyzes a traffic which is transmitted and received between the wireless terminal and the external device in real time. A USB(Universal Serial Bus) interface(310) transmits and receives a signal with the wireless terminal / external device using USB communications protocol.