Abstract:
Disclosed are a cloud server and a data management method thereof. According to one embodiment of the present invention, the cloud server includes a storage which includes a physical allocation space allocated to each terminal user to store data and a logical allocation space allocated to a plurality of terminal users to store data in a way the same data is not duplicated; and a client administrator which stores data in the physical or logical allocation space of the storage according to the request from a terminal connected to the Internet.
Abstract:
PURPOSE: A channel resource management device and a method thereof are provided to manage PHY-FH(PHYsical-Frequency Hopping) and MAC-FH(Media Access Control-Frequency Hopping) by using one channel hopping sequence. CONSTITUTION: A setting unit(810) sets a channel hopping offset value and a channel hopping sequence. The time slot allocation unit(820) allocates a time slot. A time slot and frame division unit(830) divides the time slot into a plurality of sub-slots. The time slot and frame division unit divides a data frame into a plurality of sub-frames. A channel selection unit(840) selects a channel for transmitting the plurality of the sub-frames to the plurality of the sub-slots by using the index of the sub-slot transmitting the sub-frame, the index of the time slot, the channel hopping offset value, and the channel hopping sequence. [Reference numerals] (810) Setting unit; (820) Time slot allocation unit; (830) Time slot and frame division unit; (840) Channel selection unit;
Abstract:
PURPOSE: An apparatus for managing a controlling node, a method for the same, a growing environment sensor network system using the same are provided to reduce the overhead of a data frame by managing data for the controlling node at a separate server. CONSTITUTION: A data analyzing part(31) analyzes data collected from a sensor node. The data analyzing part selects a controlling node containing a controlling device to be controlled. A server accessing part(32) communicates with a managing server(50) saving and managing metadata. A metadata acquiring part(33) acquires the metadata related to the controlling device contained in the selected controlling node.
Abstract:
PURPOSE: An apparatus and a method for managing a slot are provided to manage a slot through the three times of command frame exchange and the primitive exchange of MLME(MAC sublayer management entity) and an upper layer. CONSTITUTION: A node 3 transmits a DSME-GTS(Deterministic And Synchronous Multi-Channel Extension Guaranteed Time Slot) request command for requesting the allocation of a slot to a node 1(S310). The DSME-GTS request command includes the number of a requested slot and information about a current DSME slot allocation bit-map sub block. DSME SAB(Slot Allocation Bitmap), sub block information has a bit-mapped form. The node 1 broadcasts assigned slot information and a DSME-GTS response command, which includes a destination address, to an adjacent node(S320). The assigned slot information includes the DSME SAB sub block information A node 3 broadcasts the slot information assigned to inform an allocation result to the adjacent node and the DSME-GTS notification command including the destination address to the adjacent node(S330).
Abstract:
PURPOSE: An apparatus and a method for wake-up signal communication are provided to activate an RF(Radio Frequency) reception unit for a certain cycle in order to confirm whether or not the received signal is a wakeup signal. CONSTITUTION: An RF reception unit(310) receives a wireless signal through an antenna, and an SFD(Start of Frame Delimiter) detection unit(320) activates the RF reception unit for time shorter than the cycle according to a pre-defined search period. The SFD detection unit detects an SFD which indicates that the received wireless signal is a wakeup signal. If the SFD is detected, a wakeup signal detection unit(330) detects the wakeup signal by continuously activating the RF reception unit.
Abstract:
본 발명은 불필요한 센서노드의 전력 소모를 최소화하여 센서노드의 수명 연장 및 전체 센서 네트워크의 소모 전력을 극소화 할 수 있는 저전력 센서노드를 위한 웨이크업 장치 및 제어 방법에 관한 것이다. 본 발명의 웨이크업 장치는 센서노드의 수명을 극대화 하는 방안으로 센서노드의 송수신 장치를 필요할 때에만 무선 신호로 깨우는 극소전력 무선 장치인 웨이크업 구조로 이뤄졌으며, 본 발명의 웨이크업 장치에서는 미리 부여된 웨이크업주소 신호로 선택적인 센서노드의 웨이크업이 가능하다. 특정 웨이크업주소와 함께 웨이크업 신호를 전송하여 센서노드의 웨이크업 장치에서 수신된 웨이크업 신호에서 웨이크업주소를 식별, 검증 및 웨이크업 신호 송신과 휴면 상태의 센서노드 및 센서 네크워크를 깨우기 위한 동작 제어를 위한 인터럽트 발생이 가능하다. 본 발명에서의 극소전력 웨이크업 장치를 통해 센서노드의 전력 관리 및 센서 네트워크에서의 소모전력을 최소화하여 긴 배터리 교환주기를 가능하게 하여 전체 시스템의 높은 에너지 효율을 기대할 수 있으며, 사용자의 애플리케이션에 따라 센서노드의 웨이크업 장치를 다양하게 활용 가능하다. 유비쿼터스, 센서 네트워크, 센서노드, 웨이크업(Wake-up), 저전력, 무선 신호, Unicast, Broadcast, Multicast
Abstract:
A single port memory control apparatus for bi-directional data communication and a control method thereof are provided to reduce the number of RAM for buffering data by performing reading/writing transmission/receiving data from a memory composed of an external synchronous signal port RAM. A single port memory control apparatus for bidirectional data communication includes a transmission control unit(120), a receiving control unit(110), a mediation control unit(103), and a mode selection unit(104). The transmission control unit(120) generates read/write signals for a transmission packet frame by using write/read enable-signals and write data of the transmission packet frame generated in a transmission terminal. The receiving control unit(110) generates read/write signals for a receiving packet frame by using the write/read enable-signals and write data of the receiving packet frame generated in a receiving terminal. The mediation control unit(103) mediates the reading/writing of a memory for the transmission/receiving packet frames which are inputted from the transmission control unit(120) and the receiving control unit(110) according to an operation mode. The mode selection unit(104) outputs an operation mode signal to the mediation control unit(103).
Abstract:
A digital AGC(Automatic Gain Control) method in a burst mode optical receiver and a device therefor are provided to generate a selective reset signal inside the optical receiver, thereby being suited to a small-sized chip and extending a loud/soft ratio and the dynamic range of an input signal even as maintaining a fast response. When a burst is initiated, the bottom level of an outputted voltage signal is detected. A reset signal is generated based on a reference voltage generated according to an output signal of a trans-impedance amplifier(102). The detected bottom level is compared with the input signal. According to the compared results, an AGC signal is generated to control gain of the trans-impedance amplifier(102).
Abstract translation:提供了一种突发模式光接收机及其装置中的数字AGC(Automatic Gain Control,自动增益控制)方法,用于在光接收机内部产生选择性复位信号,从而适合于小尺寸芯片并延伸大/软比率, 输入信号的动态范围即使保持快速响应。 当突发启动时,检测输出电压信号的底部电平。 基于根据跨阻放大器(102)的输出信号生成的参考电压产生复位信号。 将检测到的底层电平与输入信号进行比较。 根据比较结果,产生AGC信号以控制跨阻放大器(102)的增益。
Abstract:
본 발명은, 비동기전송모드(ATM) 계층을 통하여 에이티엠적응계층1에서의 T1/E1 등의 전용선(leased line) 데이터를 구조화하기 위한 구조경계를 식별할 수 있는 포인터의 생성장치 및 그 방법에 관한 것으로, 그 구성은 포인터 값 및 ATM 셀의 순서를 기억하기 위한 Pointer_P 값을 이용하여 다음 사이클 구조경계 값을 생성하는 다음 사이클 구조경계 생성수단; 상기 다음 사이클 구조경계 생성수단으로부터 입력된 다음 사이클 구조경계 값을 블록 사이즈 값으로 나눈 나머지 값을 계산하는 모듈로 계산수단; 상기 다음 사이클 구조경계 생성수단으로부터 입력된 다음 사이클 구조경계 값과 상기 모듈로 계산수단으로부터 입력된 나머지 값과 외부로부터 입력된 블록 사이즈 값을 이용해 현재 사이클의 구조경계 값을 생성하는 현재 사이클 구조경계 생성수단; 상기 현재 사이클 구조경계 생성수단으로부터 입력된 현재 사이클 구조경계 값에 따라 구조경계를 위한 포인터 값과 Pointer_P 값을 각각 생성하는 포인터 계산수단; 및 순서번호와 시작번호를 입력받아 상기 다음 사이클 구조경계 생성부 및 현재 사이클 구조경계 생성수단으로 인에이블 신호를 발생하는 제어신호 발생수단을 포함하는 것을 특징으로 한다.
Abstract:
PURPOSE: A device of compensating for characteristics of a laser diode and an optical transmitter comprising device thereof are provided to change a bias current of a laser diode according to a temperature change, and to regularly output an optical power of the laser diode. CONSTITUTION: An optical output detector(2) detects an optical power outputted from a laser diode(1), and converts the optical power into a voltage. A bias current controller(3) detects a maximum level of the voltage, and outputs the first control value corresponding to a difference between the maximum level and the first reference voltage. A modulation current controller(4) detects a minimal level of the voltage, and outputs the second control value corresponding to a difference between the minimal level and the second reference voltage. A laser diode driver(5) outputs a driving current in accordance with the first and second control values to the laser diode(1).