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With the recent paradigm shift towards Cloud computing and Service Oriented Architecture (SOA), Service selection and evolution have emerged as significant challenges for service integrators and maintainers. Service selection process involves both subjective and objective factors based on user feedback and performance assessment, along with inherently imprecise data. Similarly, determining the relative importance of component services (CS) in a service composition is not a trivial task, and encounters similar challenges as for service selection. This relative importance of CSs is crucial to quantify the impact of a proposed change in service composition. However, existing literature lacks a systematic procedure which aggregates user feedback and real world performance assessment data, while incorporating inherent fuzziness of these criteria. In this study, we formulate these problems as Multi-Criteria Decision problems, and propose a hybrid MCDM model based on Fuzzy Delphi methodology (FDM), Fuzzy Analytic Hierarchy Process (FAHP), Fuzzy Vikor and Fuzzy TOPSIS to tackle previously mentioned issues. The proposed model is different from existing studies in services computing, as it incorporates both user feedback and real world performance assessment data, and deals with uncertainty in decision making process. FDM is used to determine critical subjective and objective factors for service selection and importance degree of CSs in existing compositions. Then, Fuzzy AHP is used to determine the criteria weights, while FTOPSIS or FVIKOR is used to rank the alternatives.

As we search to achieve sustainable development and substance, energy security and efficiency should be viewed not only from the perspective of addressing short-term challenges, but also as a necessity for long-term growth of the economy. Latterly, some articles have majored on selecting the best energy policy and arbitrating the best energy alternatives. In this paper, AHP, VIKOR, PROMETHEE and TOPSIS approaches are suggested for the selection among energy policies. The methodology is based on these four methods under a comparison. In the application of the proposed methodologies, the best energy policy is determined for Turkey.

Service quality evaluation has become a main area of interest for practitioners, managers, researchers and policy makers, who have inclined on the passengers' service. In this paper, intuitionistic fuzzy TOPSIS approach is applied to evaluate service quality of rail transit systems of Istanbul. A total of 6553 surveys are conducted and analyzed in seven rail lines with respect to 20 service qualities.

The evaluation of medical imaging devices is a critical issue for both biomedical engineers and health-care investors. This study proposes a new technique to assess common medical imaging devices using type-2 fuzzy multi-criteria decision making approach. The evaluation criteria were characterized by the interviews with the experts. A Gaussian type-2 Fuzzy membership function was assigned for each interval of the evaluation. TOPSIS algorithm was applied to our system using type-2 Fuzzy numbers. The results were classified with the Wu and Mendel's ranking method. The ranking of device alternatives highlighted the accurate order of future imaging technologies with the fuzzy behavior of medical investments in conjunction with the requirements of the clinicians and the engineers.

In the knowledge economy, a key source of sustainable competitive advantage relies on the way to create, share, and utilize knowledge. This paper presents an application of the interval type-2 TOPSIS method used to select the most appropriate tool to support knowledge management (KM) activities in a healthcare system. The method provides us with a useful way to handle fuzzy multiple attributes group decision-making problems in a more flexible and more intelligent manner to analyze and compare KM tools in the software market. A case study is given to demonstrate the potential of the methodology.