| http://www.w3.org/ns/prov#value | - Last, carrying a smart phone has been a part of human's daily life, other forms of gateways will be an extra burden for the subject.Among the amount of the off-the-shelf smart phones, an HTC HD2 with a 1 GHz CPU and 448 MB RAM is chosen, although any types of smart phones such as an iPhone or an Android phone could act as the gateway.
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