Yüksek Lisans, Proje Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.11779/215

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Market Basket Analysis Using Apriori Algorithm
(MEF Üniversitesi, Fen Bilimleri Enstitüsü, 2018) Şimşek, Yıldırım Murat; Çakar, Tuna
Predictive analysis is a branch of data engineering that predicts some occurrence or probabilities depend on the data. To make predictions about future events, predictive analytics uses data mining techniques. The process of these techniques involves an analysis of historic data and predicts the future events based on that analysis. Also using predictive analytics modelling techniques, a model can be created to predict. Depending on the data that they are using these predictive models can be varied. Predictive analytics is made of various statistical and analytical techniques used to develop models that will predict future occurrence, events or probabilities. Market basket analysis is one of the data mining techniques that focusing on discovering purchasing pattern by extracting associations from a store’s transactional data. The electronic commerce point-of-sale expanded the utilization and application of transactional data in Market Basket Analysis. The needs of the customers have to be known and adapted to them from the retailers. The retailers collect information about their customers and what they purchase with the help of the advanced technology. Analysing this information is extremely valuable for understanding purchasing behaviour in retail commerce. Market basket analysis is one possible way to discover which items can be sold together. This analysis gives retailer valuable information about related sales on a group of goods basis customers who buy bread often also buy several products related to bread like milk or butter. It makes sense that these groups are placed side by side in a store so that customers can reach them quickly. Market basket analysis is very useful technique for the related group of products that are bought together, and to reorganize the supermarket layout, and also to design promotional campaigns such that products’ purchase can be improved. The main aim of this capstone project is to find the co-occurring items in consumer shopping baskets in the data set that provided by GittiGidiyor E-Commerce Company with the help of the association rule mining algorithm; apriori. Mining association rules from transactional data will provide us with valuable information about co-occurrences and copurchases of products. Such information can be used as a basis for decisions about marketing activity such as promotional support, inventory control and cross-sale campaigns.
Carbon Price Forecasting
(MEF Üniversitesi, Fen Bilimleri Enstitüsü, 2018) Karakaya, Nurhak; Ağralı, Semra
In last twenty years great improvements occurred both in technological advances and in the world economic capacity. The total production capacity of countries has been increasing rapidly. These increases need great usage of energy. For that reason, prices of energy related products are very important as they dramatically affect company budgets. Energy budgets get a great deal in total budget of companies and countries. A unit increase in an energy related product can severely affect the budget. The carbon price is one of those products. Besides carbon prices, carbon usage also affects global environment so its price also has an impact on global temperature. To forecast future carbon price different machine learning methods are used. In literature, support vector machines (SVM) [1, 2, 3], random forest (RF) [4, 5], artificial neural networks (ANN) [6, 7, 8] and Auto Regressive Moving Average (ARMA) [9] are commonly used methods. All these methods have pros and cons over the others. In this project, we also apply different machine learning methods, ANN, SVM, RF, Lasso Regression (LG)[11] and Ridge Regression (RR) [10] to forecast the carbon price over time, and give an explanation for future price movements. Then, we compare those five models by analyzing model validation methods. Finally, we choose the best model for further experiments. We have four data types: daily carbon price (CP), electricity price (EP), natural gas price (NG) and coal price (COP) that cover the period of 2009 and 2017. Prices are provided in different currencies. First of all, we work on the data to have all prices in the same currency. We completely eliminate null data. Then, graphically we investigate overall trend by smoothing the data. For analyzing data, we look for daily, monthly, yearly and seasonally time scales. For every weekday or weekends in train data set we keep a day in test data set so that we can keep the time effect in our model. After the data management process, we apply different forecasting methods to explain future carbon price tendencies.
İnşaat Sözleşmelerinde Yer Alan Ceza Koşulu ve Götürü Tazminat Kayıtları
(MEF Üniversitesi Sosyal Bilimler Enstitüsü, 2021) Dinçer, Beliz; Ekrem Kurt
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Alternative Credit Scoring Model for Thin File Customers
(MEF Üniversitesi, Fen Bilimleri Enstitüsü, 2019) Korkmaz, İstem Akça; Taş Küten, Duygu
Credit scoring is a widely used tool for banks, financial institutions or corporations. Traditional credit score models are calculated from past financial history of users, and this may lead to exclude some people who have limited financial history from the credit system. Alternative credit scoring allows sector players to access to a larger portion of these customers. The credit scoring industry has expanded with an "all data is credit data" approach that combines traditional credit scoring systems with new data points. In this study, we aim to build an alternative credit scoring model for customers who have limited financial historical data (thin file) by using alternative data points for a national bank in Turkey. Some of the alternative data points and variables have been gathered from one of the bank’s products: the authorized card for Turkish national league football tickets (Passolig). Using alternative data points combining with demographical and geographical information, we perform a comparison between the machine-learning approaches. We use logistic regression approach as a base model and perform a comparison between tree-based approaches: decision tree, random forest and XGBoost to select the most effective modelling approach
Teknolojik Uygulamaların Yazma Becerisi ile Yazma Tutumu Arasındaki İlişkisinin ve Öğrenci Deneyimlerinin İncelemesi
(MEF Üniversitesi Sosyal Bilimler Enstitüsü, 2021) Güzel Özcan, Pınar; Duygu Umutlu
Çalışmanın amacı teknolojik uygulamaların yazma becerisi ile yazma tutumu arasındaki ilişkisini görmek ve öğrenci deneyimlerini incelemektir. Araştırmanın katılımcılarını kolay erişilebilirliği nedeniyle İstanbul ili Eyüpsultan ilçesi sınırlarında bulunan bir özel okuldaki ’Digital Storytelling’ kulübünü tercih eden ortaokul öğrencileri oluşturmaktadır. Araştırma 2020-2021 eğitim öğretim yılının güz döneminde ‘Digital Storytelling’ kulübünün 8 hafta süren ders kulüp saatlerinde uygulanmıştır. Araştırma verileri; kulüp saatlerinde gözlemci tarafından alınan gözlem notları, katılımcıların dijital ve yazılı halde bulunan ürünleri, kulüp dersi bitiminde uygulanan değerlendirme anketi ve katılımcı görüşlerinin incelenmesinden elde edilmiştir. Bu veriler, tematik içerik analizi yöntemiyle analiz edilmiş ve ana temalar oluşturulmuştur. Araştırmada kulüp vaka olarak ele alınmış ve elde edilen veriler nitel yöntemle betimlenerek bulgular elde edilmiştir. Teknolojik uygulamaların kullanımı ile yazmada yaratıcılık arasında olumlu anlamda bir ilişki olduğu, teknolojik uygulamaların kullanımının yazma motivasyonunu ve yazma becerisini desteklediği bulgularına ulaşılmıştır. Teknolojik uygulamaların kullanımı ile yazma becerisi ve yazma tutumu arasındaki ilişkiyi incelemek amacıyla yapılacak benzer araştırmaların daha geniş bir zaman aralığında ve Türkçe ders saatleri içinde yapılması araştırmanın veri setinin daha kuvvetli olmasını sağlayacaktır. Aynı zamanda araştırmanın yüz yüze eğitim dahilinde yapılması teknolojik uygulamaların kullanımı ile yazma becerisi ve yazma tutumu arasındaki ilişkinin belirlemesinde daha anlamlı bir katkı sağlayacaktır.
Predicting Outcomes and Improving Game Models for Football Matches
(MEF Üniversitesi, Fen Bilimleri Enstitüsü, 2019) Göçer, Murat; Küçükaydın, Hande
This study is conducted to predict the results of the 2017/2018 English Premier League football matches and show the teams what they should pay attention to in order to win. In this study, classification algorithms are used and the algorithm that gives the best results is applied to real matches. After evaluating the results, some suggestions are made for similar future studies and for the teams to develop their game models.
Turkish Private Pension Fund Size Forecasting as an Application of Data Analytics
(MEF Üniversitesi Fen Bilimleri Enstitüsü, 2020) Kara, Serdar Ufuk; Tuna Çakar
In this study univariate and multivariate models are used to forecast the net changes in total pension fund size of a private pension company in Turkey, using the daily data between November 2003 and November 2020. Univariate models include the naïve, autoregressive (AR), moving average (MA), and autoregressive moving average (ARMA) models. Multivariate models include vector autoregression (VAR) and multiple linear regression models. Our findings suggest that multivariate model predictions outperform univariate model predictions. Univariate model predictions can be improved with walk forward approach. Increased lag size can help improve AR, MA, ARMA and VAR model predictions. Naïve model produces the weakest predictions.
Predicting Facebook Ad Impressions & Cpm Values
(MEF Üniversitesi, Fen Bilimleri Enstitüsü, 2018) Tekten, Semih; Özlük, Özgür
It is estimated that there are more than two billion active users on Facebook as of the first quarter of 2018 and social media has tremendous opportunities for advertisers in terms of performance and measurability. However, for marketing managers, it is very difficult to manage all the campaigns on different marketing channels and optimize for better results.For that reason, Facebook Marketing Partners or other optimization solutions emerged in the adtech market. In order to improve existing optimization solutions in the market, ad impression costs will be predicted in this study by using different machine learning techniques and different algorithms. The main goal of this study is to generate a robust model for predicting CPM values on Facebook, and to use that model as an in put for the existing optimization solution Adphorus offers for its clients. Adphorus is one of the Facebook Marketing Partners in the market.
Sentiment Analysis of Hürriyet Emlak
(MEF Üniversitesi, Fen Bilimleri Enstitüsü, 2017) Korkmaz, Alev; Özlük, Özgür
Sentiment analysis refer to the task of natural language processing to determine whether a piece of text contains some subjective information and what subjective information it expresses, whether the attitude behind a text is positive, negative or neutral.
Applications of Balanced Scorecard in Different Business Contexts
(MEF Üniversitesi Sosyal Bilimler Enstitüsü, 2019) Aktaş, Utku; Karadağ, Hande
In this project, it is aimed to explain the elements and give background information, to show industrial applications of balanced scorecard in different industries, to show implementations of balanced scorecard in 4 chosen companies, to explain corporate balanced scorecard in academic studies, and last but not least conclude the research. The results of this analysis indicates that this document is a very important tool for a company to track and measure its success, detect and identify the relevant measures and actions in order to achieve the overall goals. It is seen that even the single work of an employee can highly contribute to the goals of the company, if integrated with balanced scorecard. This study is expected to contribute to the literature by its focus on the important performance measurement system of Corporate Balanced Scorecard and the application of this system in different contexts.
Akademik Kütüphanelerde Kullanım Ödüncü Sözleşmesi
(MEF Üniversitesi Sosyal Bilimler Enstitüsü, 2019) Yarar, İpek; Kurt, Ekrem
Kütüphaneler; Toplumu oluşturan bireylerin sosyo-kültürel açıdan gelişimine katkı sağlayan ve sonsuz bir dönüşümde olan dünyada bireylere bilginin kaynaklığını eden mekanlar olarak görev almaktadır. Kütüphaneciler ise söz konusu bu mekanlarda temel görevi bilgiyi araştırmacılarla doğrudan buluşturmak ve/veya bilgiye ulaşılan yolda rehberlik etmek olan önemli dinamiklerden biridir. Proje çalışmasının konusu olan “Akademik Kütüphanelerde Kullanım Ödüncü Sözleşmesi” de kütüphaneler içerisinde kütüphaneciler tarafından verilen hizmetlerden biridir. Geniş kapsamda bilgi olarak tanımlayabileceğimiz kitaplar, süreli yayınlar, elektronik yayınlar, makaleler vb. kaynakların araştırmacıya ulaştırılmasında öncelikle bilginin düzenlenmesi, araştırılmaya uygun hale gelmesi, sunulması, araştırmacıyla buluşturulması ve tanıtılması ise kütüphanelerin temel iş akışlarıdır. Bilginin ya da kaynağın kullanıcıyla buluşturulması kütüphanelerde “Kullanıcı Hizmetleri”nin bir parçasıdır. Çalışmada Kullanıcı Hizmetleri’nde sunulan ödünç verme işleminin kütüphaneciler açısından hukuksal düzlemdeki yerini inceleyeceğiz. Bu düzlemde ödünç verme işlemlerini inceleyecek fakat bu incelemeden önce Kullanım Ödüncü’nün temel bilgisini işleyeceğiz.
Çocuklardaki Yardım Etme Davranışına Yönelik Tutumların Sosyal Alan Teorisi Kapsamında İncelenmesi
(MEF Üniversitesi Sosyal Bilimler Enstitüsü, 2021) Küçükosman, Özge; Melike Acar
Bu araştırmanın amacı ilkokul 3. ve ortaokul 7. sınıf çocuklarının yardımdavranışlarına yönelik tutumlarının ve gerekçelerinin Sosyal Alan Teorisi (Turiel,1983) kapsamında incelemesi ve karşılaştırılmasıdır. Araştırmanın evreni İstanbul’daki eğitim ve gelir seviyesi yüksek ailelerin çocuklarının okuduğu özel bir ortaokulun 3. ve 7. sınıf öğrencileridir. Örneklem seçiminde tabakalı yöntem kullanılmış ve toplam 28 öğrenci ile çalışılmıştır. Yapılan klinik görüşmeler sırasında katılımcılara dört farklı hikâye anlatılmış ve her durum için yardım etme eğilimleri tespit edilmiştir. Yardım talep eden kişinin yardımaduyduğu ihtiyaç ve yardım eden kişinin bulunacağı fedakârlık düzeyinin farklılık gösterdiği bu hikayelerde katılımcılardan yardım etmeye yönelik eğilimlerine gerekçe göstermeleri istenmiş ve katılımcıların gerekçeleri Sosyal Alan Kuramı alanları ve alt kriterler ile eşleştirilmiştir. Öğrencilerin hikayelerin tamamı dikkate alınarak verdiği cevaplar incelendiğinde yardım etme davranışının kız öğrencilerde yaşla birlikte azalma gösterdiği; oğlan öğrencilerde ise artış gösterdiği tespit edilmiştir. Hikayelerdeki yardım davranışı ayrı ayrı incelendiğinde, öğrencilerin karşılarındaki kişinin yardıma ihtiyacı arttıkça yardım etme davranışının da arttığı görülmüştür. Kişinin yardıma ihtiyacının fazla olduğu durumlarda öğrencilerin bulunacakları fedakârlık düzeyi artsa da kişisel çıkarlarını ikinci plana atarak yardım etme davranışında bulunmayı tercih ettikleri görülmüştür. Öğrenciler çoğunluklayardım etme gerekçelerini evrensel ahlaki normlar kavramlarıyla açıklamışlardır. Karşılarındaki kişinin yardım ihtiyacının düşük olduğu ancak ödeyecekleri bedelin yüksek olduğu durumlarda öğrencilerin yardım etme eğilimleri yaş ve cinsiyete göre farklılıklar göstermiştir. Öğrencilerin her hikâye için yardım etme eğilimleri ve bu eğilimlerine gösterdikleri gerekçeler MEB’in kök değerler içinde kabul ettiği yardımseverlik ve Sosyal Alan Teorisi çerçevesinde tartışılmıştır.
Game Recommendation System for Steam Platform
(MEF Üniversitesi Fen Bilimleri Enstitüsü, 2021) Bayram, Serhan; Semra Ağralı
Increasing number of choices and competition in the markets, force companies to differ in services they provide to their customers. Offering better services have a positive impact on customer loyalty, and to do so, companies should understand their customers’ interests and act accordingly. One popular method for this purpose is building recommendation engines to make personalized suggestions. In this project, collaborative filtering methods with implicit feedback are used to make recommendations to users of theSteam platform. The recommendation systems are built using two different matrix factorization techniques, Alternating Least Squares and Bayesian Personalized Ranking. Different models are created with implicit playtime data of the users and the results are evaluated by using Precision at k metric. Additionally, similar items that are offered by the models are analyzed. Results show that the models are considerably successful at finding personal choices and similar items. The best model finds the item in the libraries of 33% ofthe users.
Scoring Neighborhoods for Locating Atm Using Machine Learning
(MEF Üniversitesi, Fen Bilimleri Enstitüsü, 2018) Yıldırım, Oğuzhan; Küçükaydın, Hande
Facility location is a general problem that is important for many different sectors and it is even more important when building the facility costs too much. In this project we analyzed the neighborhoods of Turkey and built two different models to estimate the good and bad neighborhoods for locating an ATM, which has significant costs for banks to build one. We used demographic and socio-economic data of 4,504 neighborhoods in Turkey and built models using Linear Regression and Decision Tree techniques of Machine Learning to find the best neighborhoods for locating a new ATM for a new bank entering the market. We compared the results of two machine learning methods and the results showed that we can make successful predictions of the neighborhoods by using machine learning methods which are good to locate an ATM without classical optimization techniques that requires complex calculations and machine learning methods.
Airbnb Host Recommendation Engine
(MEF Üniversitesi Fen Bilimleri Enstitüsü, 2021) Arslan, Batuhan; Özgür Özlük
In this project, a fifth rule is proposed to reveal guests ' comments about hosts using the recommendation system and sentiment analysis for the super hosts' selection for Airbnb. This project is aimed to contribute to Airbnb's selection of Super hosts. In this study, sentiment analysis and comment data are examined, and polarity scores are created for use in suggestion systems. A collaborative filtering method is used for the recommendation system. The FunkSVD algorithm received the best RMSE score. Polarity scores are estimated for each latent user by looking at the host and listing id. The recommendation system developed ranked the polarity scores of hosts for each user.
The Passanger Load Factor Prediction of Airline Transport
(MEF Üniversitesi, Fen Bilimleri Enstitüsü, 2017) Karakoç, Kalender; Arslan, Şuayb Ş.
Turkish Airlines is one of the most preferred leading European air carriers with global network coverage thanks to its strict compliance with flight safety, reliability, product line, service quality and competitiveness. Turkish Airlines maintains its identity as the flag carrier of Turkey.
Text Classification Using Apache Spark
(MEF Üniversitesi, Fen Bilimleri Enstitüsü, 2018) Azizoğlu, Umut Rezan; Özlük, Özgür
One of the biggest problems of enterprises which are marketplace e-commerce business model with social platform; The improper communication of their social platform is the negative impact of the customer experience and the damage of the brand's value both materially and morally. As the number of daily commentaries is in numbers that cannot be read manually with optimal human resources in terms of company profitability, the interpretation modules in social market places are left unconscious. With this Project; established a model that prevents sentences that spoil the customer experience in their social platforms. Both data preparation and machine learning model were developed on Databricks notebook, using the apache spark platform with SparkML libraries and Pyspark language. The “Text Classification” approach is adopted when determining the model.
Credit Risk Estimation With Machine Learning and Artifical Neural Networks Algorithms
(MEF Üniversitesi Fen Bilimleri Enstitüsü, 2021) Yıldız, İlker; Berk Gökberk
Credit risk assessment is very important for financial institutions today. The probability that a financial institution customer will not be able to repay the credits used is called credit risk. Financial institutions accept or reject credit applications. Institutions evaluate credit applications according to the personal information of the customers, life situation, loyalty, etc. If these data are below various values, financial institutions reject the application. The organization rejected the application because the client anticipated financial difficulties in the future. In the project, "German Credit" data on the Kaggle platform was used. In this data set, customers information and credit status are found as "good" and "bad". By using these data, it is aimed to evaluate new credit application requests. The data set used was passed through various pre-data processing steps and models such as Logistic Regression, Artificial Neural Networks, K-NN, Support Vector, Naïve Bayes, Decision Trees, Random Forest, LGBM and XGB were trained. The highest accuracy is achieved using the XGB model. (0.74)
A Study on Churn Prediction in Telecommunication and Pay Tv Area
(MEF Üniversitesi, Fen Bilimleri Enstitüsü, 2020) Şayık, Murat; …
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İşletmelerde Finansal Risk Yönetimi ve Önemi
(MEF Üniversitesi Sosyal Bilimler Enstitüsü, 2019) Muğ, Ezgi; Karamollaoğlu, Nazlı
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