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1 A Framework for Seamless Human-Content-Environment Interaction Abstract. In this paper, we propose a new framework which can support seamless human-contentenvironment interactions in ubiquitous computing environments. Although there have been many research activities on concepts of computing (virtual reality, augmented reality, mobile, wearable, and ubiquitous computing), they have focused on development of technologies in their territories. There have been a few research efforts on the concept of natural human-content-environment interaction in a unified way with a usercentered perspective. The proposed framework provides seamless interactions with a consistent and a unified way by taking into account mobile/wearable computing as users, VR/AR as contents, and ubiquitous computing as environments, respectively. To support the consistent and unified perspective for developers, users, contents, and environments can be modeled by a set of sensors and services as well as the interaction among them can be modeled by user-centric context. We believe that the proposed framework can be an initiative interaction paradigm for user-centric ubiquitous computing environments. Keywords: Seamless interaction, personalized user interface, responsive content, harmonious service environment

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°í¼®ÁÖ Ãâ·Â Performance Optimization of SCTP in Wireless Internet Environments The existing works on Stream Control Transmission Protocol (SCTP) was focused on the fixed network environment. However, the number of