| Summary: | 博士 === 國立東華大學 === 資訊工程學系 === 96 === Ubiquitous computing is the trend of future life, which means anyone can use anything to access any service at anytime no matter where he/she is. Under this vision, many technologies should be developed and applied to satisfy people’s desire. However, behind these technologies, one of the important concerns is user-centricity. Novel technologies should always help people with usage transparency. That is to say, technologies must accommodate human’s common actions rather than the other way around. In this dissertation, two major approaches are proposed to accomplish the purpose. The first one is to think from user sides, which includes semantic approach and user-centric identification. Semantic communication is human’s nature. A semantic service discovery methodology is proposed in the dissertation. Also, user identification is important. A process of identifying user through common behaviors model is addressed with the consideration of keeping user anonymous (which means information can not be associated with a user at all), pseudonymous (which means transactions can be linked to a pseudonym but not to a particular individual, e.g. nicknames), or veronymous (which means the user is revealed and proven as real identity). The other one involves several technical improvements, which makes pervasive environment more efficient and feasible. These refinements comprise internetworking between heterogeneous network environments and protocols, and an enhancement of performance while roaming. In accordance with the globalization of ubiquitous environment, IPv6 is a proper core of communication. For this, in compliant with widely separated IPv4 network, the transition mechanisms from IPv4 to IPv6 are examined and evaluated. A cooperating model between IP-based and non-IP-based networks is presented for the cross realm ubiquitous networks. The example scenario is an integration of ZigBee/802.15.4 and IPv6/802.3 networks. For enhancing the performance with Mobile IPv6, a cross-layer mechanism in proposed. All of these are focused on one aspect – construct a user-centric ubiquitous computing prospect.
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