Welcome to IIKI 2015, the International Conference on Identification,Information, and Knowledge in the Internet of Things, held October 22–23, 2015, in Beijing, China.

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The Internet of Things (IoT) brings traditional Internet industry and society together with new trends and promising technologies. Realizing the full potential of the Internet of Things requires solving serious technical and business challenges, such as identification of things, organization, integration and management of big data, and the effective use of knowledge-based decision systems. These challenges, and more, are the focus for IIKI. The 2015 conference, the fourth in the IIKI series, provides the scientific and technical community with a dedicated forum for international experts from the USA, Europe, and China to discuss their views on the current trends, challenges, and state-of-the-art solutions related to various issues in the Internet of Things.

IIKI 2015 aims at providing a dedicated forum for discussing research, development,and deployment efforts for knowledge issues in the Internet of Things. We received more than 120 submissions from China, Europe, and the USA. We are excited about the variety of papers that are included in the conference program, reflecting the global momentum in research in this domain. Each submission was rigorously peer reviewed by at least three reviewers from the Program Committee to ensure the quality. Finally, we accepted 25 regular papers and 38 short papers. The regular accepted rate is less than 21%. The selected works address a number of key topics in this space, such as knowledge engineering, big data and cloud computing, wireless and mobile security, frontiers in cyberphysical systems, industry 4.0, mobile opportunistic networks, user experience, and e-health and mobile health. We would like to express our appreciation to all authors of submitted papers, Program Committee members, and reviewers.