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Managing mechanism for service compatibility and interaction issues in context-aware ubiquitous home
Baek, Seungho,Lee, Hyunjeong,Lim, Shinyoung,Huh, Jaedoo IEEE 2005 IEEE transactions on consumer electronics Vol.51 No.2
In this article, the intelligent home care system based on context-awareness consists of a sensor platform, a context-aware framework and an intelligent agent, where a sensor platform collects raw data and sends them to a context-aware framework, where perceives residents' and a home's context. An intelligent agent triggers intelligent and automatic services according to the information based on situation of the context-aware framework. We design and implement an intelligent home care system based on the context-awareness technology, which minimizes residents' interventions and maximizes functional autonomy of systems. Also we suggest system architecture and its flows for the proposed system. In this article we discuss interaction issue about conflict and interference between various context information and service in the ubiquitous home environment. Context information conflict arises in deciding service through various sensing information. Service interaction generated when service is applied in different controls at the same time for the same device. We focused on context-aware based service mechanism.
WiMedia UWB MAC에서의 무선 구간 손실을 고려한 TSPEC 추정 방안
김재완(Jaewan Kim),이현정(Hyunjeong Lee),허재두(Jaedoo Huh),이성창(Sungchang Lee) 대한전자공학회 2008 電子工學會論文誌-TC (Telecommunications) Vol.45 No.9
WLP(WiMedia Logical link control Protocol)는 WiMedia UWB 플랫폼 상에서 IP 서비스를 지원하기 위한 프로토콜로서 상위 계층으로부터 전달된 패킷들에 대해서 QoS를 보장하여 전송하려고 할 때, TSPEC 파라미터를 사용하여 DRP 방식의 예약을 하도록 정의하고 있다. 그러나, TSPEC이 알려져 있지 않은 응용의 트래픽의 경우에는 MAS 할당 및 QoS를 보장해 주기 곤란하다. 본 논문에서는 이러한 경우에 대해서 해당 트래픽의 실시간 모니터링을 통해 TSPEC을 추정함으로써 QoS를 보장해 주는 방안을 제안하였다. 우선, TSPEC이 주어지지 않은 트래픽에 대하여 TSPEC 추정기법을 제안한다. 또한, 실제에 있어서 있을 수 있는, 무선 구간에서의 손실이 있는 경우를 가정하고 이를 보상한 TSPEC 파라미터 추정으로 상위계층에서 요구하는 QoS를 보장할 수 있는 TSPEC을 추정하는 기법을 제안하였다. 제안된 기법에 대해서, Imm-ACK 방식을 가정하여, 패킷 손실이 있는 무선 상황에서 제안하는 TSPEC 추정 기법이 해당 트래픽이 요구하는 QoS를 보장하는지 시뮬레이션을 통해 성능 평가를 하였다. WLP(WiMedia Logical link control Protocol) is a protocol to support IP services on the WiMedia UWB platform. It defines that DRP needs to be employed using TSPEC parameters when the packets from upper layer transmit with QoS. However, there is no appropriate means to provide QoS when the TSPEC of the traffic is unknown. In this paper, we propose TSPEC estimation scheme to provide QoS for such unknown applications by monitoring the traffic in realtime. Also, the scheme to estimate the effective TSPEC is proposed that compensate the packet losses in the wireless environment to provide the required QoS. The performances of the proposed TSPEC estimation schemes are evaluate by simulation assuming random wireless packet loss and Imm-ACK mechanism.
Guaranteeing Real-Time Services for Industrial Wireless Sensor Networks With IEEE 802.15.4
Seong-eun Yoo,Poh Kit Chong,Daeyoung Kim,Yoonmee Doh,Minh-Long Pham,Eunchang Choi,Jaedoo Huh IEEE 2010 IEEE transactions on industrial electronics Vol.57 No.11
<P>Industrial applications of wireless sensor networks require timeliness in exchanging messages among nodes. Although IEEE 802.15.4 provides a superframe structure for real-time communication, a real-time message-scheduling algorithm is still required to schedule a large number of real-time messages to meet their timing constraints. We propose a distance-constrained real-time offline message-scheduling algorithm which generates the standard specific parameters such as beacon order, superframe order, and guaranteed-time-slot information and allocates each periodic real-time message to superframe slots for a given message set. The proposed scheduling algorithm is evaluated and analyzed extensively through simulations. In addition, a guaranteed time service is implemented in a typical industrial sensor node platform with a well-known IEEE 802.15.4-compliant transceiver CC2420 and ATmega128L to verify the feasibility of the guaranteed time service with the schedule generated by the proposed scheduling algorithm. Through experiments, we prove that the real system runs accurately according to the schedule calculated by the proposed algorithm.</P>