Çevik, Neslihan

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Citation - WoS: 4
Variable Neighborhood Search-Based Algorithms for the Parallel Machine Capacitated Lot-Sizing and Scheduling Problem
(Academic Publication Council, 2025) Yildiz, Seyda Topaloglu; Ozcan, Sel; Cevik, Neslihan
This paper addresses the capacitated lot-sizing and scheduling problem on parallel machines with eligibility constraints, sequence-dependent setup times, and costs. The objective is to find a production plan that minimizes production, setup, and inventory holding costs while meeting the demands of products for each period without delay for a given planning horizon. Since the studied problem is NP-hard, we proposed metaheuristic approaches, Variable Neighborhood Search, Variable Neighborhood Descent, and Reduced Variable Neighborhood Search algorithms to analyze their performance on the problem. Initially, we presented an initial solution generation method to satisfy each period's demand. Then, we defined insert, swap, and fractional insert moves for generating neighborhood solutions. We employed an adaptive constraint handling technique to enlarge the search space by accepting infeasible solutions during the search. Lastly, we performed computational experiments over the benchmark instances. The computational results show the effectiveness of the proposed solution approaches, compared to existing solution techniques in the literature, and the improvements in various problem instances compared to the best-known results.
A Multigene Genetic Programming Approach on Weather Forecasting
(İzmir Ekonomi Üniversitesi, 2020) Çevik, Neslihan; Anagün, Ahmet Sermet
Hava durumu ve hava durumu tahminlerinin kesinliği, özellikle yolcu taşımacılığı alanında ve günlük yaşamımızda çok önemli bir role sahiptir, çünkü hizmetin kalitesini ve güvenliğini doğrudan etkiler. Bu çalışmada amaç, farklı tahmin yaklaşımları analizler sonucu elde edilen tahmin hatalarını kullanarak karşılaştırmaktır. Veriler, TC Tarım ve Orman Bakanlığı, İzmir Meteoroloji Genel Müdürlüğü Adnan Menderes Havalimanı tarafından 2015-2017 yılları için, sekiz bağımsız değişken ile günlük ortalama sıcaklık ve rüzgar hızı iki bağımlı değişken olacak şekilde sağlanmıştır. Çoklu Gen Genetik Programlama Yaklaşımı ve Gaussian Regresyonunun, SVR ve ANN ile karşılaştırıldığında daha düşük RMSE değerleriyle daha başarılı bir performansa sahip olduğunu göstermiştir.

Çevik, Neslihan

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