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Öğe Enhanced Predictive Models for Construction Costs: A Case Study of Turkish Mass Housing Sector(Springer, 2019) Uğur, Latif Onur; Kanıt, Recep; Erdal, Hamit; Namlı, Ersin; Erdal, Halil İbrahim; Baykan, Umut Naci; Erdal, MürselThe analysis of a construction project, regarding cost, is one of the most vital problem in planning. Due to its nature, the construction sector is an area of strong competition and estimation works are of vital importance. In recent years the Turkish Republic has started a serious urban regeneration movement in parallel to its economic development. This study is based on the drawings and quantities of 63 detached multi-story reinforced concrete housing unit projects of the Housing Development Administration (TOKI) and the Turkey Residential Building Cooperative Union (TURKKONUT). TOKI is a public company and its projects are that have been applied to 282 separate projects and are being applied to a further 266. On the other side TURKKONUT is a union of 1347 private building cooperative and have been completed 200,000 residential building. The main objective of this study is to improve the estimation accuracy of individual machine learning techniques, namely multi-layer perceptron and classification and regression trees and compares the performance of two machine learning meta-algorithms (i.e., bagging and random subspace) on a real world construction cost estimation problem. The study shows that the estimation accuracy of ensemble models are better than the models that constructed by their base learners and ensemble models may improve individual machine learning models.Öğe FUZZY LOGIC MODEL FOR PREDICTION OF COMPRESSIVE STRENGTH OF CONCRETE BY USE OF NON-DESTRUCTIVE TEST RESULTS(Serban Solacolu Foundation, 2017) Baykan, Umut Naci; Erdal, Mürsel; Uğur, Latif OnurIn this study, a fuzzy logic prediction model for compressive strength of concrete was developed based on various nondestructive tests, such as Windsor Probe Penetration Test, Ultrasonic Pulse Velocity and Schmidt Hammer. Experimental results of non-destructive tests were used to construct the fuzzy logic model. The obtained results with fuzzy logic were compared with the multiple linear regression model and experimental values. It was observed that, non-destructive tests' determination abilities were increased by using fuzzy logic. Results have shown that, fuzzy logic systems have strong potential for predicting 28 days compressive strength using Windsor Probe Penetration value, Ultrasonic Pulse Velocity and Schmidt Hammer rebound as inputs variables.Öğe A fuzzy logic model for prediction of compressive strength of concrete by use of non-destructive test results [Predic?ia rezisten?ei la compresiune a betonului pe baza unui model fuzzy ?i a rezultatelor unor teste non-destructive](Fundatia Serban Solacolu, 2017) Baykan, Umut Naci; Erdal, M.; Uğur, Latif OnurIn this study, a fuzzy logic prediction model for compressive strength of concrete was developed based on various nondestructive tests, such as Windsor Probe Penetration Test, Ultrasonic Pulse Velocity and Schmidt Hammer. Experimental results of non-destructive tests were used to construct the fuzzy logic model. The obtained results with fuzzy logic were compared with the multiple linear regression model and experimental values. It was observed that, non-destructive tests’ determination abilities were increased by using fuzzy logic. Results have shown that, fuzzy logic systems have strong potential for predicting 28 days compressive strength using Windsor Probe Penetration value, Ultrasonic Pulse Velocity and Schmidt Hammer rebound as inputs variables. © 2017, Fundatia Serban Solacolu. All rights reserved.Öğe Kat Karşılığı İnşaat Sözleşmelerinde Sözleşme Risk Analizi Yaklaşımları(2017) Güneş, Ayşe; Baykan, Umut Naci; Uğur, Latif OnurKat karşılığı inşaat yapımı günümüz inşaat sektöründe oldukça yaygındır. Müteahhit ve arsa sahibi arasında imzalanan kat karşılığı inşaat sözleşmesi ile tarafların yükümlülükleri ve hakları belirtilir. Bu çalışmada üç adet kat karşılığı inşaat sözleşmesinin; sözleşme sorumluluklarında risklerin dağılımı, risk grupları ve önem derecelerinin belirlenmesi ve İngiliz Local Government Task Force-Standart İnşaat Sözleşmeleri Klavuzu: Sözleşme Anahtar Özellikleri ve Bileşenleri Tabloları kullanılarak risk analizleri yapılmıştır. Tarafların sorumluluğunda olan işler ile bunları gerçekleştirememeleri durumunda ortaya çıkacak riskler tespit edilmiştir. Yapılan risk analizleri sonucunda müteahhitin arsa sahibine nazaran daha çok sorumluluğu olduğu ve sorumluluklarını yerine getirememesi durumunda daha çok risk altında olduğu saptanmıştır. Bundan dolayı müteahhitlik yapacak olan firmanın bir projenin sorumluluğunu yüklenmeden önce işin sözleşmesinin risk analizlerini yaparak ortaya çıkan sonuçlara göre karar vermesi daha doğru olacaktırÖğe Konut Satın Alma Kararı Verilmesinde Gri İlişkisel Analiz Tekniği Uygulaması(2017) Uğur, Latif Onur; Baykan, Umut NaciBu çalışmada, konut satın alınması kararının verilmesinde çok kriterli karar verme yaklaşımlarından Gri İlişkisel Analiz kullanılmıştır. Bu yöntem, veri miktarının yetersiz olduğu hallerde özellikle tercih edilmektedir. Bu yöntemle seçenekler arasında kriterlerin eşit ağırlıkta olması ve farklı değerler taşıması hallerine göre iki ayrı hesaplama ve sıralama yapılmıştır. Çalışmada altı farklı kriter esas alınmış ve dokuz farklı alternatif arasından seçimler yapılmıştır. Yöntemin benzer problemlerin çözümünde yalnız başına yada başka yöntemlerle birlikte kullanılabilmesi mümkün bulunmaktadırÖğe A Model Proposal for Wall Material Selection Decisions by Using Analytic Hierarchy Process (AHP)(Polish Acad Sciences Inst Physics, 2017) Uğur, Latif Onur; Baykan, Umut NaciAnalytical hierarchy process, developed by Saaty, is a multi-criteria decision making method. It creates a hierarchy using the goal, decision criteria and decision alternatives, and sorts the various alternatives according to their relative importance. The aim in AHP is to choose the most suitable and important alternative, by making an arrangement from the most important to the least. In this study, a real life material selection application in a hotel building is described by using AHP method. Wall materials such as brick blocks, pumice concrete block, sand autoclaved aerated concrete blocks are decision alternatives and mechanical properties, physical properties, ease of application and costs of these materials are the decision factors. The analysis was performed based on the opinion of an expert and the most suitable alternative is selected. Also, it is concluded that the order related to the alternatives is reliable for the decision markers. Thus, a decision supporting method for a construction company using AHP applications is developed.