This dissertation presents a semantics-based context-aware dynamic service composition framework that composes an application through combining distributed components based on the semantics of components and contexts of users. The proposed framework consists of Component Service Model with Semantics (CoSMoS), Component Runtime Environment (CoRE), and Semantic Graph based Service Composition (SeGSeC). CoSMoS models the semantics of components and contexts of users. CoRE is a middleware to support CoSMoS on various distributed computing technologies. SeGSeC is a mechanism to compose an application by synthesizing its workflow based on the semantics of components and contexts of users. By leveraging the semantic information of components, the proposed framework is able to compose applications requested in a natural language. By leveraging contextual information, the proposed framework is able to compose applications adaptively to individual users. The proposed framework also adapts to dynamic environments by autonomously composing a new application upon detecting context change. This dissertation describes the design and mechanism of the proposed framework, and also presents simulation experiments to evaluate the proposed framework.
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