실시간으로 특정 대상의 위치를 추적하는 것은 특히 u-헬스 서비스에 있어서는 이용자가 자율적인 통제가 어려운 상황에 처할 수 있음에 따라 중요하게 요구되는 사항이다. 지금까지 위치를 인식하는 대표적 방법으로 삼각측량법이 제시되어 왔는데, 이는 세 개의 고정된 기준점에 의하여 대상노드와의 거리를 측량하여 위치를 추정하는 방법이다. 그러나 특히 u-헬스 서비스에서 이용자는 위치인식을 위한 기준 수신장치로부터 멀어지거나 또는 수신장치의 장애,고장,부재 등과 같은 통신 도달성이 결여된 여건에 처할 수 있다. 본 논문에서는 이러한 특수한 여건이나 상황에 적용가능한 위치인식 방안과 이를 실시간으로 추적할 수 있는 방법을 연구하여 제시한다.
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