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Hakan Kalkavan

Other affiliations: Istanbul Medeniyet University
Bio: Hakan Kalkavan is an academic researcher from Istanbul Medipol University. The author has contributed to research in topics: Corporate social responsibility & Social responsibility. The author has an hindex of 7, co-authored 19 publications receiving 152 citations. Previous affiliations of Hakan Kalkavan include Istanbul Medeniyet University.

Papers
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Journal ArticleDOI
TL;DR: The findings indicate that the replacement of mechanical system is found as the most effective TRIZ-based investment strategy for solar energy projects regarding both commercial and non-commercial customers and that solar energy companies should give special support to their customers with respect to the security issues.

60 citations

Journal ArticleDOI
TL;DR: In this paper, the authors evaluated PERT-based critical paths of new service development (NSD) process for renewable energy investment projects and concluded that solar energy is the most appropriate renewable energy alternative.
Abstract: The purpose of this study is to evaluate PERT-based critical paths of new service development (NSD) process for renewable energy investment projects. In this context, a novel three-stage model has been proposed. In the first stage, 10 different steps in NSD process are weighted by considering 2-tuple hesitant interval-valued Spherical fuzzy IVSF DEMATEL approach. In the second stage, 26 different critical paths for NSD process are identified. Moreover, the third stage includes the ranking the renewable energy alternatives by path scenarios with 2-tuple hesitant IVSF TOPSIS. The findings demonstrate that idea screening and the formation of cross-functional team are the most significant criteria for the NSD process of renewable energy investments. Additionally, while considering all activities of NSD process, it is concluded that solar energy is the most appropriate renewable energy alternative. This result is also similar for considering the longest path by activity number, the longest path by duration and the shortest path by activity number. However, it is also determined that geothermal energy is the most ideal type of renewable energy to invest in while considering the shortest path by duration. Therefore, it is obvious that investors should primarily give importance to generate new products for solar energy projects. In this way, it can be easier for them to provide efficiency in their investments. On the other hand, if there is time constraint or a positive result is expected from the project in a short time, geothermal energy is the most suitable renewable energy type to invest.

38 citations

Book ChapterDOI
01 Jan 2019
Abstract: The economic crisis is an important event that hurts societies. Communication between the market and the authorities is an important factor in economic crisis situations. Because if the communication is established in a healthy way, economic crises in the future may not be repeated. In this context, the chapter deals with the economic crisis of 1997 in the Asian region as part of crisis communication. In the study conducted with Logit method, data belonging to the period 1975-2006 were used. In addition, the variables used frequently in the literature were considered as data set indicators. The results indicate that economic growth, financial credit, and money supply are important indicators affecting the crisis. Indeed, the emergence of the crisis with these variables reveals that there was a communication problem in the Asian region. Considering this experience, it has been suggested that Asia and other countries should care about the communication tools.

30 citations

Book ChapterDOI
01 Jan 2020
TL;DR: In this paper, three different Islamic banks operating in Turkey were taken to the scope of review, and six different variables that are important for the banking sector have been identified, and the data of these variables in the 2010-2018 period were analyzed by ARIMA method.
Abstract: This chapter aims to predict the future of Islamic banking in Turkey. Three different Islamic banks operating in Turkey were taken to the scope of review. Within this framework, six different variables that are important for the banking sector have been identified. The data of these variables in the 2010-2018 period were analyzed by ARIMA method, and six different models were established. As a result, it is predicted that Islamic banking will grow in the future, and its profitability will increase. However, the ratio of non-performing loans is expected to increase, and capital is expected to decrease. Therefore, Islamic banks should be more cautious in this growth process. In this context, it is important to conduct an effective credibility analysis of customers to be loaned. This situation has a contributing effect on the sustainable economic development of the country.

23 citations

Journal ArticleDOI
TL;DR: In this article, the authors identify the factors affecting economic inequality in emerging seven (E7) countries, and make a wide literature review has been made and 12 different criteri...
Abstract: This study aims to identify the factors affecting economic inequality in emerging seven (E7) countries. Within this framework, first, a wide literature review has been made and 12 different criteri...

17 citations


Cited by
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Posted Content
01 Jan 2014
TL;DR: This Review presents basic facts regarding the long-run evolution of income and wealth inequality in Europe and the United States and discusses possible interpretations and lessons for the future.
Abstract: This Review presents basic facts regarding the long-run evolution of income and wealth inequality in Europe and the United States. Income and wealth inequality was very high a century ago, particularly in Europe, but dropped dramatically in the first half of the 20th century. Income inequality has surged back in the United States since the 1970s so that the United States is much more unequal than Europe today. We discuss possible interpretations and lessons for the future.

580 citations

Reference EntryDOI
15 Sep 2008

273 citations

Journal ArticleDOI
TL;DR: An extension of group decision-making (GDM) and spherical fuzzy numbers is proposed regarding solar energy projects in this article , which can also contribute significantly to the solution of the carbon emission problem.

133 citations

Journal ArticleDOI
TL;DR: The results illustrate that ease of access and security are among the most prominent factors of customer requirements for renewable energy investments and it is identified that innovative technical requirement entitled cushion in advance has the best choice for the sustainable renewable energy projects.
Abstract: The purpose of this study is to determine appropriate innovative strategies for the renewable energy investments For this purpose, a hybrid multi-criteria decision-making (MCDM) model is proposed based on interval type-2 (IT2) fuzzy sets and alpha cut levels Within this context, hesitant IT2 fuzzy DEMATEL-Based Analytic Network Process (DANP) with alpha cut levels is applied for weighting the customer requirements Moreover, hesitant IT2 fuzzy technique for order preference by similarity to ideal solution (TOPSIS) with alpha cut levels is used for ranking the TRIZ-based strategies priorities of renewable energy investments based on house of quality technique These strategies are also ranked with hesitant IT2 fuzzy Vise Kriterijumska Optimizacija I Kompromisno Resenje (VIKOR) approach to make a comparative evaluation The results illustrate that ease of access and security are among the most prominent factors of customer requirements for renewable energy investments It is also identified that innovative technical requirement entitled cushion in advance has the best choice for the sustainable renewable energy projects Furthermore, the results of proposed model using hesitant IT2 fuzzy DANP and hesitant IT2 fuzzy TOPSIS are identical for the different levels of alpha cut In addition, it is also defined that the results of hesitant IT2 fuzzy TOPSIS and hesitant IT2 fuzzy VIKOR are quite coherent This is a clear evidence that the proposed model is coherent and could provide comprehensive results for the future studies It is strongly recommended that a detailed analysis is required to identify the risks in renewable energy investment projects Hence, necessary actions can be taken appropriately so that it can be possible to prevent problems before they grow

78 citations

Journal ArticleDOI
TL;DR: In this article, a multi-criteria decision-making model based on incomplete preferences, consensus-based group decision making and Pythagorean fuzzy sets is proposed to improve the performance of renewable energy investments.
Abstract: The aim of this study is to generate appropriate strategies to improve renewable energy investments. Within this framework, a novel model has also been proposed which includes three different stages. Firstly, incomplete preferences of the relation matrixes are calculated. For this purpose, 4 different decision makers evaluate the balanced scorecard-based criteria. In this stage, missing values are estimated by incomplete preferences to complete the relation matrixes. Additionally, the second stage includes the computing the fuzzy preferences by considering the consensus-based group decision-making (CGDM). The final stage is related to the calculation of the weights of the criteria by considering Pythagorean fuzzy decision-making trial and evaluation laboratory (DEMATEL) methodology. Hence, the main motivation of this study is to identify innovative strategies for the renewable energy investments with a novel multi-criteria decision-making (MCDM) model based on incomplete preferences, CGDM and Pythagorean fuzzy sets. The findings indicate that learning and growth is the most important balanced scorecard-based perspective to improve the performance of renewable energy investments. Additionally, the perspective of internal process is identified as another significant factor for this situation. The biggest problem in renewable energy projects is their high initial costs. Hence, technological developments reduce the production costs of renewable energy sources. Additionally, it is also possible to increase the amount of electricity from renewable energy sources owing to the innovative technologies. Thus, renewable energy investors should follow up-to-date technological developments so that it will be possible to reduce the cost of renewable energy investments.

74 citations