a b s t r a c tMulti-Criteria Decision Making (MCDM) techniques are gaining popularity in energy supply systems. The aim of this paper is to develop the multi-criteria decision support framework for ranking renewable energy supply systems in Turkey. Given the selection of renewable energy supply systems involves many conflicting criteria, multi criteria decision methods (Fuzzy TOPSIS) were employed for the analysis. The Interval Shannon's Entropy methodology was used to determine weight values of the criteria. In this study, a ¼ 0.1, 0.5 and 0.9 values based sensitivity analysis were performed. Three a-cutting levels were identical to the sequence of alternatives. According to result, the first criterion in preference ranking of renewable energy sources in Turkey is the Amount of Energy Produced, followed by the ranking systems Land use, Operation and maintenance cost, Installed capacity, Efficiency, Payback period, Investment cost, Job creation, and Value of CO 2 emission. Thus the multi-criteria analysis showed that the Hydro Power Station is determined to be the most renewable energy supply system in Turkey. Additionally, the Geothermal Power Station, Regulator and Wind Power Station are determined to be the second, third and fourth, respectively. The government of Turkey should invest, in order of priority, in these systems. The government should also evaluate the projects, which are related to these renewable energy resources.
1.GİRİŞGünümüzde küreselleşme olgusunun yaygınlaş-masıyla beraber bilişim teknolojisinin hızlanması, firmaları uluslararası bir arenada rekabetçi ortama sü-rüklemektedir. Böyle rekabetçi bir ortamın hızlı bir şe-kilde yansımalarını finansal piyasalarda daha net bir şekilde görebilmekteyiz. Dolayısıyla Şirketler iktisadi hayatlarını başarılı bir şekilde devam ettirebilmeleri için sürekli olarak stratejik planlamalar esasında kendi performanslarını geleceğe yönelik ışık tutabilecek bir şekilde değerlendirmeleri gerekmektedir. Yapılan performans analizleri sonucunda işletmelerde karar verme konumunda olan yöneticiler, ilgili kaynakların etkin bir şekilde kullanılmasında ve genel olarak verimliliğin artırılmasında daha da bilinçli bir şekilde planlamalar yapabileceklerdir.Firma düzeyinde ve sektör bazında yapılan finansal değerlendirmeler, yöneticiler açısından önemli olduğu gibi yatırımcılar açısından da büyük bir öne-me sahip olmaktadır. Yatırımcılar yapılan analizler ve değerlendirmeler ışığında bilgi şeffaflığı sayesinde alacakları yatırım kararlarında ve oluşturacakları portföy konusunda daha rasyonel ve bilinçli davranabileceklerdir. Dolayısıyla iktisadi bir ortamda performans analizi ve işletmelerin değerlendirilmesi gerek bireysel olarak, gerekse sektör bazında zorunlu bir hale gelmiştir. Şirketlerin performansları değerlendi-rilirken sırf finansal göstergelerin kullanılması çelişkili sonuçlar vererek karar verme sonuçlarını zorlaştırabi-lir. Bu şekilde muhtemel sorunların karşımıza çıktığı durumlarda Çok Kriterli Karar verme yöntemlerinin karşılaştırılmalı olarak kullanılması daha iyi sonuçlar verebilmektedir. ABSTRACTIn this study, measured the financial efficiencies of enterprises operating in Istanbul Stock Exchange "Iron Steel Metal Industry" sector for the between 2009-2011 years. The financial statements enterprises were evaluated based on the effectiveness using the Data Envelopment Analysis. Also Super Efficiency application is performed in order to see the efficiency rank of decisionmaking units (companies) which are considered efficient through DEA and TOPSIS methods. These were compared and interpreted different methods with the obtained findings.
Supplier selection decisions require the choices of individual purchases to determine products and order quantities from certain suppliers. When suppliers are evaluated according to well-defined criteria, their level of effort and attention to detail is expected to increase significantly. This can provide to improve productivity. So, determination of supplier selection criteria that is a multi-criteria decision making process can include both quantitative and qualitative elements that are very important. In this article, the aim is to offer a fuzzy decision making method to determine leading criteria, in terms of supplier selection for an automobile company that operates in Iran, because the right suppliers that are selected according to well-defined criteria can significantly reduce the material purchasing costs and improve corporate competitiveness. For that purpose, linguistic values are used for expressing fuzzy numbers in order to assess the ratings and weights of these factors by considering criteria such as the decisions made by people who work in the purchasing department of the company. Afterward, the fuzzy TOPSIS method that is a multiple criteria decision making (MCDM) method according to fuzzy set theory is presented to cope with the determination of supplier selection criteria process. According to the results, it is determined that the following are important for supplier selection criteria for automobile firms: delivery, the amount of past business, reciprocal arrangements, warranties, and geographical location.
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