A FUZZY BASED DECISION SUPPORT SYSTEM FOR AIR CONDITIONER SELECTION AND AN APPLICATION TO TURKISH CONSTRUCTION SECTOR Tolga Temuçin, Hakan TozanOriginal scientific paper In the construction industry, air conditioners (AC) are vital structural segments affecting human's comfort and health directly. In this context selection process for the proper AC requires the usage of multi-criteria decision making (MCDM) methods due to conflicting criteria such as purchasing and maintenance costs, technical sufficiency, quality of service, performance, etc. This study provides distinct systematic approaches both in fuzzy and crisp environments to deal with the selection problem of appropriate AC and proposes a decision support model helping decision makers in construction sector to assess the potentials of different products. The required data for decision matrices is obtained via a questionnaire administered to specialists as well as deep discussions with experts working in one of the leading construction firms and making use of past studies. An application of the proposed model is also performed in a leading construction company in Turkey. Keywords: air conditioning industry; construction sector; ELECTRE; fuzzy logic; multi-criteria decision making; TOPSIS Fuzzy temeljen sustav za pomoć kod donošenja odluke o izboru klima uređaja i primjena u građevinskom sektoru u TurskojIzvorni znanstveni rad U građevinarstvu su klima uređaji -air conditioners (AC) bitni konstrukcijski elementi od direktnog utjecaja na udobnost i zdravlje ljudi. U tom kontekstu postupak izbora odgovarajućeg uređaja zahtijeva primjenu metoda za donošenje odluke s više kriterija (MCDM -multi-criteria decision making) zbog kontradiktornih kriterija kao što su kupovni troškovi i troškovi održavanja, zadovoljavajuća tehnička svojstva, kvaliteta upotrebe, radne karakteristike itd. U radu se daju jasni, sustavni pristupi i u fuzzy i u crisp okruženju za izbor odgovarajućeg klima uređaja i predlaže model za pomoć onima u građevinskom sektoru koji donose odluku da procijene mogućnosti raznih proizvoda. Podaci potrebni za matrice donošenja odluke dobivaju se putem upitnika podijeljenih stručnjacima kao i podrobnih razgovora s ekspertima koji rade u jednoj od vodećih građevinskih tvrtki te proučavanjem podataka iz prethodnih istraživanja. Predloženi je model također primijenjen u vodećem građevinskom poduzeću u Turskoj.
Multi-criteria decision making (MCDM) is a discipline that explicitly considers assessing alternatives in a decision problem with respect to multiple criteria. Those methods are frequently used to solve real-life decision problems that incorporate multiple, conflicting, and incommensurate criteria. Considering the chaotic, complex, and ambiguous nature and the dynamics of the military operations, most decision problems observed in military organizations also follow a similar structure involving multiple criteria. This chapter gives an overview of the basic decision-making problem types and decision processes observed in military organizations and provides information on the MCDM methodologies adopted to solve those problems.
This paper is devoted to the mechanisms of laser cutting of material from the point of view of thermodynamics. Thanks to the special properties of a laser beam, lasers have proved to be a reliable tool for the industry. Scientific databases currently include many papers devoted to scientific and engineering research aimed at the development and application of the technology of lasers. Operating costs of a laser system are high when operated inefficiently, therefore efficient operation is quite desirable. High dimensional accuracy and mainly good final product quality must be achieved in order to ensure the effective laser cutting. Investigation into thermodynamic efficiencies and quality assessment of the final product in laser cutting is essential. We have created an analytical expression of the thermo-dynamic parameters of the cut. By expression of the entropy S, enthalpy H, heat flow density q and Gibbs' function of free energy G a complex image of thermo-dynamic conditions of the process was achieved. These are the basic thermodynamic parameters of the laser cutting of materials. All these factors under operating conditions had an impact on the surface quality of the cut, depth of the cut and also on the intensity of changes in the mechanical properties of the material, and last but not least, on productivity and competitiveness. This can be used both for predictions concerning the technology process, as well as for control of the process.
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