Editorial
Internet of Things, Big Data and Complex Information Systems: Challenges, solutions and outputs from IoTBD 2016, COMPLEXIS 2016 and CLOSER 2016 selected papers and CLOSER 2015 keynote

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Introduction

Cloud Computing has been regarded as one of the emerging technologies and services since 2007 [1]. There are papers focusing on storage [2], high performance computing [3], applications [4], cost management [[5], [6]] and security [[7], [8], [9]]. While demands for business, research and individual requirements have been on the way up, a bottleneck has been reached. In order to move forward, more emerging services and technologies are on the rise, including Internet of Things (IoT), Big Data, Complex Information Systems and security for all of these domains. IoT provides platforms to collect all different types of data and connects to different devices through wireless connections [10]. Big Data deals with the processing, analysis, presentation and making sense of all the data collected from IoT. Implications and summary from Big Data analysis can make business and organizations more competitive, since present and future business performance, areas of improvement and future forecasts can be revealed to the stakeholders, especially decision-makers and customers [[2], [3], [4], [5], [6]]. Complex information systems represent the term to sum up the fusion between Cloud, IoT, Big Data, Artificial Intelligence and Machine Learning together. Notably, security and privacy for all these services are highly important [[7], [8], [9]].

This special issue invites top papers from the 1st International Conference on Internet of Things and Big Data (IoTBD 2016), the 1st International Conference on Complexity, Future Information Systems and Risk (COMPLEXIS 2016), and the 6th International Conference on Cloud Computing and Service Science (CLOSER 2016), together with their related workshops and events. These three international conferences and all collated events were held in Rome, Italy, between April 23 and 25, 2016. The acceptance rate for the conference papers was around 20%. We were honored and pleased to have Prof. Peter Sloot as the keynote speaker and honorable guest of our conferences.

Only the best paper winners, papers in top rankings, or winners in these events were invited. Eventually only nine papers were accepted, after passing rounds of vigorous review process. We divided the selection into two stages. In the first stage, four papers were selected and published as regular papers. In the second stage, we have selected five articles for this special issue, which can be divided into three areas: (i) modeling and prediction, (ii) cost optimization, (iii) Big Data and Cloud, and (iv) security enhancement.

Section snippets

Selected papers from part one of this special issue

There are five articles selected by part one of this special issue. For cost optimization, Li et al. [5] proposed an energy cost optimization algorithm taking into account of job security for Internet data centers in deregulated electricity markets. Based on Lyapunov optimization framework, security levels for guaranteeing job risk probability constraint, temporal diversity of electricity price, and delay guarantee was taken into account. Based on the real-life electricity price, their

Selected papers from part two of this special issue

There are four papers selected by from part two of this special issue. For modeling and prediction, Jeon et al. [4] made use of Big Data for predicting stock price by tracking similarities of historical price graph patterns. This is a very hard problem because of irregularities. They proposed a novel complex methodology with multiple steps: (i) find most similar patterns to the current situation with a Dynamic Time Warping algorithm, (ii) select features the most affecting stock prices with

Conclusion

The guest editor team has ensured that best papers in each category can be selected and disseminated for the community. Some of authors may have the choice to present their work in the forthcoming High Quality Journal Forum, in conjunction with IoTBDS 2017 and COMPLEXIS 2017 held in Porto, Portugal, between April 24 and 26, 2017. We thank FGCS board, Elsevier editor team and Prof. Peter Sloot for their ongoing support and kind assistance to make our scholarly activities more influential and

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