Abstract
A new system named Home-Explorer that searches and finds physical artifacts in a smart indoor environment is proposed. The view on which it is based is artifact-centered and uses sensors attached to the everyday artifacts (called smart objects) in the real world. This paper makes two main contributions: First, it addresses, the robustness of the embedded sensors, which is seldom discussed in previous smart artifact research. Because sensors may sometimes be broken or fail to work under certain conditions, smart objects become hidden ones. However, current systems provide no mechanism to detect and manage objects when this problem occurs. Second, there is no common context infrastructure for building smart artifact systems, which makes it difficult for separately developed applications to interact with each other and uneasy for them to share and reuse knowledge. Unlike previous systems, Home-Explorer builds on an ontology-based knowledge infrastructure named Sixth-Sense, which makes it easy for the system to interact with other applications or agents also based on this ontology. The hidden object problem is also reflected in our ontology, which enables Home-Explorer to deal with both smart objects and hidden objects. A set of rules for deducing an object's status or location information and for locating hidden objects are described and evaluated.
Highlights
The development of wireless sensor network makes it possible to embed sensors into everyday artifacts, creating smart artifacts, which can act as self-aware and environment-aware agents to deliver humancentric services
By analyzing the physical relations between smart object Book-A and skeleton object Table-B, we can infer that Book-A is not placed directly on the desktop because there is a height difference between them, common sense indicates that there must be something between Book-A and the desktop; by executing Rule-2 in Section 4.1 for smart objects, we find that none of them is located under Book-A, so we may conclude that there is a hidden object
Definition 7. (Diverse Test Types): In our system, an accurate test is one in which an object property or a hidden object is detected at the right time by the right rule, it scores a true positive (TP)
Summary
The development of wireless sensor network makes it possible to embed sensors into everyday artifacts, creating smart artifacts, which can act as self-aware and environment-aware agents to deliver humancentric services. One such service supported by a ubiquitous smart artifacts environment, is the real world search. Unlike Google search in the virtual world, a real world search system can identify the real-time location, status and profile information of physical world objects. Such a search system can save people a lot of time and effort in organizing and managing their physical belongings.
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