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            <front>

                <journal-meta>
                                    <journal-id></journal-id>
            <journal-title-group>
                                                                                    <journal-title>Karaelmas Fen ve Mühendislik Dergisi</journal-title>
            </journal-title-group>
                            <issn pub-type="ppub">2146-7277</issn>
                                                                                                        <publisher>
                    <publisher-name>Zonguldak Bülent Ecevit Üniversitesi</publisher-name>
                </publisher>
                    </journal-meta>
                <article-meta>
                                        <article-id pub-id-type="doi">10.7212/karaelmasfen.1484595</article-id>
                                                                <article-categories>
                                            <subj-group  xml:lang="en">
                                                            <subject>Construction Business</subject>
                                                    </subj-group>
                                            <subj-group  xml:lang="tr">
                                                            <subject>Yapı İşletmesi</subject>
                                                    </subj-group>
                                    </article-categories>
                                                                                                                                                        <title-group>
                                                                                                                        <article-title>Yapım İşlerinde İhale Parametreleri Kullanılarak Makine Öğrenmesi ile Sözleşme Bedeli Tahmini</article-title>
                                                                                                                                                                                                <trans-title-group xml:lang="en">
                                    <trans-title>Construction Contract Price Prediction Using Machine Learning with Bidding Parameters</trans-title>
                                </trans-title-group>
                                                                                                    </title-group>
            
                                                    <contrib-group content-type="authors">
                                                                        <contrib contrib-type="author">
                                                                    <contrib-id contrib-id-type="orcid">
                                        https://orcid.org/0000-0002-0127-5474</contrib-id>
                                                                <name>
                                    <surname>Aslay</surname>
                                    <given-names>Semi Emrah</given-names>
                                </name>
                                                                    <aff>ERZİNCAN ÜNİVERSİTESİ</aff>
                                                            </contrib>
                                                                                </contrib-group>
                        
                                        <pub-date pub-type="pub" iso-8601-date="20241125">
                    <day>11</day>
                    <month>25</month>
                    <year>2024</year>
                </pub-date>
                                        <volume>14</volume>
                                        <issue>3</issue>
                                        <fpage>64</fpage>
                                        <lpage>73</lpage>
                        
                        <history>
                                    <date date-type="received" iso-8601-date="20240515">
                        <day>05</day>
                        <month>15</month>
                        <year>2024</year>
                    </date>
                                                    <date date-type="accepted" iso-8601-date="20240730">
                        <day>07</day>
                        <month>30</month>
                        <year>2024</year>
                    </date>
                            </history>
                                        <permissions>
                    <copyright-statement>Copyright © 2011, Karaelmas Fen ve Mühendislik Dergisi</copyright-statement>
                    <copyright-year>2011</copyright-year>
                    <copyright-holder>Karaelmas Fen ve Mühendislik Dergisi</copyright-holder>
                </permissions>
            
                                                                                                <abstract><p>Kamu ihalelerinde sözleşme bedelleri, temel olarak metraj ve birim fiyatlardan oluşmaktadır ve dolayısıyla bu parametrelerle yakından ilişkilidir. Bu parametrelerden başka, daha sade sayısal ifadeler üretebilen ve parasal anlaşma bedelleri hakkında önemli ipuçları veren ihale verileriyle de anlamlı ilişkilere sahiptir. Dolayısıyla ihale verileri ile sözleşme bedeli arasındaki anlamlı ilişkinin değerlendirilmesi önem kazanmaktadır. Bu çalışmada inşaat işlerinde ihale değişkenleri kullanılarak makine öğrenmesi yöntemleri ile sözleşme bedelleri tahmin edilmeye çalışılmaktadır. Bunun için temel ve popüler algoritmalardan yararlanılmıştır. Tahmin modellerini geliştirmek amacıyla bir dizi hiper parametre optimizasyonu yapılarak olumlu sonuçlar alınmıştır. Özellikle çalışmada en iyi sonuçlara sahip olan XGBoost ve ANN algoritmalarında uygulanan parametrik optimizasyonlar, mevcut modelin daha iyi bir performansı göstermesini sağlamıştır. XGBoost 0.9435, MAE 1.2988, RMSE 2.0621 en iyi genelleme yeteneğine sahip algoritma olmuştur. Çalışma hem kullandığı parametrelerin özgünlüğü hem de makine öğrenmesi modelinde uygulanan hiper parametre optimizasyonları ile literatüre katkı sunmaktadır.</p></abstract>
                                                                                                                                    <trans-abstract xml:lang="en">
                            <p>In public tenders, contract values are primarily composed of quantities and unit prices, and therefore are closely related to these parameters. Besides these parameters, contract values are also meaningfully associated with procurement data that can produce more straightforward numerical expressions and provide significant insights into monetary agreement values. Therefore, evaluating the meaningful relationship between procurement data and contract value becomes crucial. This study aims to predict contract amounts in construction works using machine learning methods with bidding variables. Basic and popular algorithms were employed for this purpose. A series of hyperparameter optimizations were conducted to enhance prediction models, yielding positive results. Particularly, the parametric optimizations applied to XGBoost and ANN algorithms, which demonstrated the best results in the study, improved the performance of the existing model. XGBoost achieved the best generalization ability with an of 0.9435, MAE of 1.2988, and RMSE of 2.0621. The study contributes to the literature by introducing novel parameters and implementing hyperparameter optimizations in the machine learning model.</p></trans-abstract>
                                                            
            
                                                            <kwd-group>
                                                    <kwd>ANN</kwd>
                                                    <kwd>  kamu ihaleleri</kwd>
                                                    <kwd>  makine öğrenmesi</kwd>
                                                    <kwd>  sözleşme bedeli</kwd>
                                                    <kwd>  XGBoost</kwd>
                                            </kwd-group>
                                                        
                                                                            <kwd-group xml:lang="en">
                                                    <kwd>ANN</kwd>
                                                    <kwd>  public tenders</kwd>
                                                    <kwd>  machine learning</kwd>
                                                    <kwd>  contract price</kwd>
                                                    <kwd>  XGBoost</kwd>
                                            </kwd-group>
                                                                                                            </article-meta>
    </front>
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