The Second International Conference on Green Communications, Computing and Technologies (GREEN 2017), held between September 10-14, 2017 in Rome, continued the inaugural event focusing on current solutions, stringent requirements for further development, and evaluations of potential directions. The event targeted to bring together academia, research institutes, and industries working towards green solutions. Expected economic, environmental and society wellbeing impact of green computing and communications technologies led to important research and solutions achievements in recent years. Environmental sustainability, high-energy efficiency, diversity of energy sources, renewable energy resources contributed to new paradigms and technologies for green computing and communication. Economic metrics and social acceptability are still under scrutiny, despite the fact that many solutions, technologies and products are available. Deployment at large scale and a long term evaluation of benefits are under way in different areas where dedicated solutions are applied. The conference had the following tracks:  Improving Green-ness  Smart Energy and Smart Grid We take here the opportunity to warmly thank all the members of the GREEN 2017 technical program committee, as well as all the reviewers. The creation of such a high quality conference program would not have been possible without their involvement. We also kindly thank all the authors that dedicated much of their time and effort to contribute to GREEN 2017. We truly believe that, thanks to all these efforts, the final conference program consisted of top quality contributions. We also gratefully thank the members of the GREEN 2017 organizing committee for their help in handling the logistics and for their work that made this professional meeting a success. We hope that GREEN 2017 was a successful international forum for the exchange of ideas and results between academia and industry and to promote further progress in the field of green communications, computing and technology. We also hope that Rome, Italy provided a pleasant environment during the conference and everyone found some time to enjoy the historic charm of the city.

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Drawing from an analogy between features based Product Line (PL) models and Constraint Programming (CP), this paper explores the use of CP in the Domain Engineering and Application Engineering activities that are put in motion in a Product Line Engineering ...

Drawing from an analogy between features based Product Line (PL) models and Constraint Programming (CP), this paper explores the use of CP in the Domain Engineering and Application Engineering activities that are put in motion in a Product Line Engineering strategy. Specifying a PL as a constraint program instead of a feature model carries out two important qualities of CP: expressiveness and direct automation. On the one hand, variables in CP can take values over boolean, integer, real or even complex domains and not only boolean values as in most PL languages such as the Feature-Oriented Domain Analysis (FODA). Specifying boolean, arithmetic, symbolic and reified constraint, provides a power of expression that spans beyond that provided by the boolean dependencies in FODA models. On the other hand, PL models expressed as constraint programs can directly be executed and analyzed by off-the-shelf solvers. This paper explores the issues of (a) how to specify a PL model using CP, incl...