최근 들어 인간 중심의 정보화 사회가 USN 기술의 발전과 더불어, 사물 간에도 정보들이 유기적으로 결합되고 활용될 수 있는 유비쿼터스 컴퓨팅 사회로 급격히 변모하고 있다. 이러한 유비쿼터스 컴퓨팅 사회를 성공적으로 구축하기 위해서는 센서노드 하드웨어, 센서 네트워크, USN 미들웨어, 그리고 USN 응용 서비스 등의 USN 핵심기술의 개발이 반드시 필요하게 된다. 본 논문에서는 USN 응용 시스템과 센서노드 하드웨어 의 중간 부분에 위치하여, 이 둘 간의 유연한 통합을 지원할 수 있는 USN 미들웨어 기술에 대하여 자세히 소개하고자 한다. 먼저, Server-side 미들웨어와 In-network 미들웨어로 구성된 USN 미들웨어의 개념, USN 미들웨어가 제공해야 할 핵심기능들, 그리고 기존에 발표된 USN 미들웨어의 특징에 대하여 살펴보고, 이러한 USN 미들웨어의 특징을 반영하여 현재 ETRI에서 개발되고 있는 USN 미들웨어 플랫폼의 시스템 구성과 이를 활용한 응용 시스템에 대하여 간략히 살펴볼 것이다.
KSP Keywords
In-network, Server side
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