Yıldız, Beytullah
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Yıldız, Beytullah B.,Yildiz Yildiz, B B., Yildiz B., Yıldız Beytullah, Yildiz Y.,Beytullah Yildiz,B. Y., Beytullah Yıldız,B. Beytullah, Yıldız Yildiz, Beytullah B.,Yıldız
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Doçent Doktor
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beytullah.yildiz@atilim.edu.tr
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Software Engineering
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Sustainable Development Goals
1NO POVERTY
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Research Products
2ZERO HUNGER
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3GOOD HEALTH AND WELL-BEING
2
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4QUALITY EDUCATION
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5GENDER EQUALITY
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6CLEAN WATER AND SANITATION
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7AFFORDABLE AND CLEAN ENERGY
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8DECENT WORK AND ECONOMIC GROWTH
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9INDUSTRY, INNOVATION AND INFRASTRUCTURE
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10REDUCED INEQUALITIES
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11SUSTAINABLE CITIES AND COMMUNITIES
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12RESPONSIBLE CONSUMPTION AND PRODUCTION
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13CLIMATE ACTION
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14LIFE BELOW WATER
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15LIFE ON LAND
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16PEACE, JUSTICE AND STRONG INSTITUTIONS
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17PARTNERSHIPS FOR THE GOALS
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Documents
15
Citations
177
h-index
8
Documents
15
Citations
87
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Scholarly Output
19
Articles
8
Views / Downloads
67/96
Supervised MSc Theses
6
Supervised PhD Theses
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WoS Citation Count
62
Scopus Citation Count
148
Patents
0
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0
WoS Citations per Publication
3.26
Scopus Citations per Publication
7.79
Open Access Source
2
Supervised Theses
6
| Journal | Count |
|---|---|
| Concurrency and Computation: Practice and Experience | 4 |
| IEEE Access | 1 |
| International Conference on Computational Science and Computational Intelligence (CSCI) -- DEC 13-15, 2023 -- Las Vegas, NV | 1 |
| International Journal of Software Engineering and Knowledge Engineering | 1 |
| International Journal on Artificial Intelligence Tools | 1 |
Current Page: 1 / 2
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19 results
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Now showing 1 - 10 of 19
Conference Object Citation - Scopus: 2Enhancing Image Resolution With Generative Adversarial Networks(Institute of Electrical and Electronics Engineers Inc., 2022-09-14) Yildiz,B.Super-resolution is the process of generating high-resolution images from low-resolution images. There are a variety of practical applications used in real-world problems such as high-definition content creation, surveillance imaging, gaming, and medical imaging. Super-resolution has been the subject of many researches over the past few decades, as improving image resolution offers many advantages. Going beyond the previously presented methods, Generative Adversarial Networks offers a very promising solution. In this work, we will use the Generative Adversarial Networks-based approach to obtain 4x resolution images that are perceptually better than previous solutions. Our extensive experiments, including perceptual comparison, Peak Signal-to-Noise Ratio, and classification success metrics, show that our approach is quite promising for image super-resolution. © 2022 IEEE.Master Thesis Reklam Tıklama Tahmini için Takviyeli Öğrenme(2023) Haıder, Umaır; Yıldız, BeytullahÇevrimiçi reklamcılıkta kritik öneme sahip tıklama oranı (CTR) tahmini için geleneksel yöntemler, kullanıcı tercihlerinin dinamikliği ve reklamların alakasını kapsamada zorlanırken, yeni stratejilerin keşfini başarılı olanlarla dengeli bir şekilde sağlayan Thompson Örnekleme gibi takviyeli öğrenme (RL) algoritmaları, etkili bir çözüm sunar. Bu araştırmada, gerçek dünya reklam izlenimleri ve tıklamalarını simüle etmek için özel bir OpenAI Gym ortamını ve kullanıcı tercihlerinin ve reklamların alakasının sürekli değişimini ele alan dinamik CTR'yi tahmin etmek için bir Thompson Örnekleme uygulamasını içeren yeni bir RL tabanlı yaklaşım sunuyoruz. Bulgular, Thompson Örnekleme'nin CTR tahmininde, diğer RL stratejilerinden yaklaşık \%10 daha yüksek bir güven seviyesi ile, üstün bir performans sergilediğini ve bu sayede çevrimiçi reklam seçim süreçlerinin önemli ölçüde gelişebileceğini, böylece daha yüksek CTR'ler ve potansiyel olarak reklam yayıncıları için artan gelir sağlayabileceğini öne sürüyor.Master Thesis Soyutlayıcı Metin Özetlemesi Derin Öğrenme Kullanarak(2021) Abbas, Hanan Wahhab Abbas; Yıldız, BeytullahÖzetleri otomatik olarak üretme yeteneği, çeşitli alanlarda verimliliğin yanı sıra bilginin yayılmasını ve elde tutulmasını iyileştirmeye yardımcı olabilir. Özetleme, soyutlamacı ve çıkarıcı olmak üzere temelde iki yaklaşım vardır. Ana fikirleri yakalamak için kaynak metnin kısa bir özetini oluşturma süreci olduğu için soyutlayıcı yaklaşım daha başarılı kabul edilir. Bu yaklaşımda, kaynak metinden oluşturulan özetler, orijinal metinde yer almayan yeni ifadeler ve cümleler içerebilir. Dikkate dayalı Tekrarlayan Sinir Ağları kodlayıcı-kod çözücü modellerinin kullanımı, özetleme ve makine çevirisi dahil olmak üzere dille ilgili çeşitli görevler için popüler olmuştur. Son zamanlarda, makine çevirisi alanında, Transformer modelinin Tekrarlayan Sinir Ağları tabanlı modelden üstün olduğu kanıtlanmıştır. Bu tezde, metin özetleme için geliştiril-miş bir kodlayıcı-kod çözücü Transformer modeli öneriyoruz. Temel model olarak, soyutlayıcı metin özetleme görevi için bir Tekrarlayan Sinir Ağları modelini olan Dikkatli Uzun Kısa Süreli Bellek kullandık. Bu çalışmanın değerlendirilmesi, ROUGE puanı kullanılarak otomatik olarak yapılmıştır. Deneysel sonuçlar, Transformer modelinin daha iyi bir özet ve daha yüksek bir ROUGE puanı sağladığını göstermektedir.Article Citation - WoS: 30Citation - Scopus: 47Text Classification Using Improved Bidirectional Transformer(Wiley, 2021-07-18) Tezgider, Murat; Yıldız, Beytullah; Yildiz, Beytullah; Aydin, Galip; Yıldız, BeytullahText data have an important place in our daily life. A huge amount of text data is generated everyday. As a result, automation becomes necessary to handle these large text data. Recently, we are witnessing important developments with the adaptation of new approaches in text processing. Attention mechanisms and transformers are emerging as methods with significant potential for text processing. In this study, we introduced a bidirectional transformer (BiTransformer) constructed using two transformer encoder blocks that utilize bidirectional position encoding to take into account the forward and backward position information of text data. We also created models to evaluate the contribution of attention mechanisms to the classification process. Four models, including long short term memory, attention, transformer, and BiTransformer, were used to conduct experiments on a large Turkish text dataset consisting of 30 categories. The effect of using pretrained embedding on models was also investigated. Experimental results show that the classification models using transformer and attention give promising results compared with classical deep learning models. We observed that the BiTransformer we proposed showed superior performance in text classification.Article Citation - WoS: 11Citation - Scopus: 20Reinforcement Learning Using Fully Connected, Attention, and Transformer Models in Knapsack Problem Solving(Wiley, 2021-08-08) Yildiz, Beytullah; Yıldız, Beytullah; Yıldız, BeytullahKnapsack is a combinatorial optimization problem that involves a variety of resource allocation challenges. It is defined as non-deterministic polynomial time (NP) hard and has a wide range of applications. Knapsack problem (KP) has been studied in applied mathematics and computer science for decades. Many algorithms that can be classified as exact or approximate solutions have been proposed. Under the category of exact solutions, algorithms such as branch-and-bound and dynamic programming and the approaches obtained by combining these algorithms can be classified. Due to the fact that exact solutions require a long processing time, many approximate methods have been introduced for knapsack solution. In this research, deep Q-learning using models containing fully connected layers, attention, and transformer as function estimators were used to provide the solution for KP. We observed that deep Q-networks, which continued their training by observing the reward signals provided by the knapsack environment we developed, optimized the total reward gained over time. The results showed that our approaches give near-optimum solutions and work about 40 times faster than an exact algorithm using dynamic programming.Conference Object Citation - Scopus: 36Improving Text Classification With Transformer(Institute of Electrical and Electronics Engineers Inc., 2021-09-15) Soyalp,G.; Alar,A.; Ozkanli,K.; Yildiz,B.Huge amounts of text data are produced every day. Processing text data that accumulates and grows exponentially every day requires the use of appropriate automation tools. Text classification, a Natural Language Processing task, has the potential to provide automatic text data processing. Many new models have been proposed to achieve much better results in text classification. The transformer model has been introduced recently to provide superior performance in terms of accuracy and processing speed in deep learning. In this article, we propose an improved Transformer model for text classification. The dataset containing information about the books was collected from an online resource and used to train the models. We witnessed superior performance in our proposed Transformer model compared to previous state-of-art models such as L S T M and CNN. © 2021 IEEEMaster Thesis Saldırı Tespiti için Takviyeli Öğrenme(2021) Saad, Ahmed Mohamed Saad Emam; Yıldız, BeytullahBulut bilişim, web servisleri ve Nesnelerin İnterneti sistemleri gibi ağ tabanlı teknolojiler, esneklikleri ve üstünlükleri nedeniyle yaygın olarak kullanılmaktadır. Öte yandan, ağ tabanlı teknolojilerin katlanarak büyümesi, ağ güvenliği sorunlarının büyüklüğünü artırmaktadır. İzinsiz giriş, ağ tabanlı teknolojilerin güvenliğinin önemli bir parçasıdır. Sağlam bir saldırı tespit sistemi uygulamak, izinsiz giriş sorununu çözmek ve ağ tabanlı teknolojilerin ve hizmetlerin güvenli bir şekilde sunulmasını sağlamak için çok önemlidir. Bu tezde, izinsiz girişleri tespit etmek ve ağ uygulamalarını daha güvenli, güvenilir ve verimli hale getirmek için pekiştirmeli öğrenmeyi kullanan yeni bir yaklaşım öneriyoruz. Takviye öğrenme yaklaşımı olarak, ağ trafiği saldırılarını taklit eden ve öğrenme sürecine rehberlik eden, özel olarak uyarlanmış bir Gym ortamının yanında kullanılan derin Q-öğrenme kullanılmaktadır. Uzun-Kısa Süreli Bellek kullanan denetimli bir derin öğrenme çözümü, karşılaştırma için temel yaklaşım alarak uygulanmıştır. NSL-KDD veri kümesi, takviye öğrenme ortamını oluşturmak için kullanılmakta olup temel modeli eğitmek ve değerlendirmek için de kullanılır. Önerilen pekiştirmeli öğrenme yaklaşımının performans sonuçları, temel modele ve literatürdeki diğer çözümlere göre büyük bir üstünlük göstermektedir.Conference Object Citation - Scopus: 2A Novel Use of Reinforcement Learning for Elevated Click-Through Rate in Online Advertising(Ieee Computer Soc, 2023-12-13) Haider, Umair; Yildiz, BeytullahEfficiently predicting Click-through Rate (CTR) is crucial for the success of online advertising. Traditional methods often struggle to adapt to the dynamic nature of user preferences and the evolving relevance of advertisements. In this study, we propose a novel Reinforcement Learning (RL) approach for CTR prediction, leveraging OpenAI Gym and the Thompson Sampling algorithm. Our approach dynamically estimates CTR, cleverly adapting to the ever-changing landscape of user preferences and advertisement relevance. Results showcase the exceptional performance of Thompson Sampling in CTR prediction, sur-passing other RL methods with a remarkable 10% higher confidence level. This emphasizes the significant potential of our RL approach in optimizing the selection of online advertisements.Article Citation - WoS: 1Citation - Scopus: 1A Model-Based Evaluation Metric for Question Answering Systems(World Scientific, 2025-01-27) Baklr, D.; Aktas, M.S.; Ylldlz, B.; Yildiz, Beytullah; Bakir, DilanThe paper addresses the limitations of traditional evaluation metrics for Question Answering (QA) systems that primarily focus on syntax and n-gram similarity. We propose a novel model-based evaluation metric, MQA-metric, and create a human-judgment-based dataset, squad-qametric and marco-qametric, to validate our approach. The research aims to solve several key problems: the objectivity in dataset labeling, the effectiveness of metrics when there is no syntax similarity, the impact of answer length on metric performance, and the influence of real answer quality on metric results. To tackle these challenges, we designed an interface for dataset labeling and conducted extensive experiments with human reviewers. Our analysis shows that the MQA-metric outperforms traditional metrics like BLEU, ROUGE and METEOR. Unlike existing metrics, MQA-metric leverages semantic comprehension through large language models (LLMs), enabling it to capture contextual nuances and synonymous expressions more effectively. This approach sets a standard for evaluating QA systems by prioritizing semantic accuracy over surface-level similarities. The proposed metric correlates better with human judgment, making it a more reliable tool for evaluating QA systems. Our contributions include the development of a robust evaluation workflow, creation of high-quality datasets, and an extensive comparison with existing evaluation methods. The results indicate that our model-based approach provides a significant improvement in assessing the quality of QA systems, which is crucial for their practical application and trustworthiness. © 2025 World Scientific Publishing Company.Article Radar Emitter Localization Based on Multipath Exploitation Using Machine Learning(Ieee-inst Electrical Electronics Engineers inc, 2024) Catak, Ferhat Ozgur; Al Imran, Md Abdullah; Dalveren, Yaser; Yildiz, Beytullah; Kara, Ali; Abdullah Al Imran, MdIn this study, a Machine Learning (ML)-based approach is proposed to enhance the computational efficiency of a particular method that was previously proposed by the authors for passive localization of radar emitters based on multipath exploitation with a single receiver in Electronic Support Measures (ESM) systems. The idea is to utilize a ML model on a dataset consisting of useful features obtained from the priori-known operational environment. To verify the applicability and computational efficiency of the proposed approach, simulations are performed on the pseudo-realistic scenes to create the datasets. Well-known regression ML models are trained and tested on the created datasets. The performance of the proposed approach is then evaluated in terms of localization accuracy and computational speed. Based on the results, it is verified that the proposed approach is computationally efficient and implementable in radar detection applications on the condition that the operational environment is known prior to implementation.