Intelligent buildings are getting data-centric -they archive the historical records of motion detectors, power usages, HVAC statuses, weather, and any other information in order to improve their control strategies. The engineering cost of installation and maintenance of such systems should be minimized as the system owner has to operate them for several decades: i.e., the lifetime of the building. However, there are several design pitfalls that multiply such engineering costs, which make the operation heavy burden. This paper identifies those pitfalls and presents technical challenges that enable lightweight installation and maintenance. We, then, design facility information access protocol (FIAP) for data-centric building automation systems. We carried out FIAP-based system integration into a building of the University of Tokyo, and demonstrate that FIAP enables incremental installation for wide varieties of applications with small engineering costs.
As the commercial use of the Internet becomes common and the demand for mobile computing through the Internet is emerging, it is necessary to construct a secure mobile environment. This paper presents an implementation example of such a system which employs a secure mobile IP protocol on stationary security gateways and mobile hosts. The IETF standard Mobile IP protocol is modified with I P security primitives, which control the packet flow from a mobile host through multiple security gateways. Using IP security primitives, the packet going into a corporate network and the packet going out the visiting network are both securely processed. This IP security based packet control allows transparent mobile access from anywhere on an IP network even with suficient security support by encrypting and authenticating IP packets. The current implementation status and the performance evaluation is also reported.
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