Abstract:
An apparatus and a method for reproducing an instance in a ubiquitous space by inferring and predicting the instance are provided to enable a user to have an effect just like moving to a past or future point by reproducing an instance inferred or predicted in a virtual space. A situation sensor(110) senses physical and electric situations in a ubiquitous space, and an information storage(130) stores the sensed physical and electric situations as space-time information. An apace-time reproducer(150) receives a reproducing request for the space-time which is to be reproduced, and reproduces the space-time information, which corresponds to the requested space-time, in a ubiquitous space. If the space-time information is not stored, the space-time reproducer infers the space-time information of past period and predicts the space-time information of future period to reproduce the inferred or predicted space-time information.
Abstract:
무선 센서 네트워크에서의 동적 모니터링 주기 설정 방법 및 시스템이 제공된다. 본 발명에 따른 센서 네트워크에서 동적 모니터링 주기 설정 방법은, 복수의 센서노드를 포함하는 센서 네트워크에서 동적 모니터링 주기를 설정하는 방법에 있어서, (a) 상기 복수의 센서노드 중 어느 한 센서노드에 대해 데이터 변화량이 소정의 인지 경계값보다 크면 모니터링 주기를 1/k배(k는 2이상의 자연수)로 변경하고, 상기 데이터 변화량이 소정의 인지 경계값 이하이면 모니터링 주기를 k배로 변경하는 단계; (b) 상기 한 센서노드의 모니터링 간격이 소정의 한계값보다 크면, 하나 이상의 이웃 센서노드에게 주기 변경을 요청하는 단계; 및 (c) 상기 이웃 센서노드의 모니터링 시각이 상기 요청한 센서노드의 모니터링 시각으로부터 모니터링 주기 조절 간격 내에 있으면, 상기 이웃 센서노드의 모니터링 시각을 상기 요청한 센서노드의 모니터링 시각으로부터 모니터링 주기 조절 간격의 범위 밖에 위치하도록 변경하는 단계를 포함한다. 무선 센서 네트워크, 센서노드, 모니터링 주기
Abstract:
PURPOSE: A method for improving power consumption in a DCF(Distributed Coordinated Function)-based wireless network is provided to prevent power from being unnecessarily consumed by classifying the beacon section at an ATIM(Announcement Traffic Indication Message) Window section according to whether a data packet to be transmitted exists and making a terminal, receiving a beacon signal, transferred to a doze state directly according to the received timing. CONSTITUTION: An ATIM Window section is divided into an ETS(Earlier Time Slot) section and an LTS(Later Time Slot) section(S31). In case that a terminal has a data packet to transmit to another terminal, the terminal transmits a beacon signal to each terminal at the ETS section. If the terminal doesn't have any data packet to transmit, the terminal transmits a beacon signal to each terminal at the LTS section(S32). If a terminal receives the beacon signal at the LTS section, the terminal enters a doze state at once, without waiting until the doze state section(S33).
Abstract:
PURPOSE: A method for processing a database on bioinformatics using user grouping is provided to reduce a response time and system expense by reducing access frequency of the data as collectively processing user's requests gathered in each access cycle. CONSTITUTION: The users requests are grouped by storing a service requested sequence received from a user terminal in a queue, transferring the service requested sequences stored in the queue for each cycle, and initializing the queue(S10). If the service requested sequences are received, respective service requested sequences are analyzed/compared with the sequence accessed at the database after accessing the database once(S20).