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Yayın Optimization of fertile land usage and agricultural production of Turkey(Işık Üniversitesi, 2017-01-18) Arslan, Şafak; Altunbay, Seyhun; Işık Üniversitesi, Fen Bilimleri Enstitüsü, Endüstri Mühendisliği - Yöneylem Araştırması Yüksek Lisans ProgramıTurkey has a large amount of land which is suitable for agriculture. On the other hand, agricultural activities gradually decrease every year. Moreover, the fertile lands are not used effectively. As a result, production of agricultural goods does not satisfy the domestic demand. Thus, Turkey is obliged to import lots of agricultural goods in the recent decade.Turkey has to develop the agricultural potential and productivity and demand -supply stability as soon as possible. For this purpose, an optimization model has been developed to optimize the fertile land usage and agricultural production to satisfy the increasing agricultural demand of Turkey. Residential settlements on fertile lands are another problem about the agriculturalland usage of Turkey. The fertile lands are allowed for the construction of residential settlements and this causes the decrease of the fertile land area beside a lot of negative effects to the national economy and nature.This study aims to find solutions to these problems with the help of an optimization model. Specifically, which parts of land has to be farmed, which products has to be cultivated, how much has to be cultivated, how much area has to be used for the cultivation of a specific product. Additionally, the model will yield the effect of loss of fertile land due to residential settlements on fertile lands.Yayın Inventory management and pricing in existence of secondary markets(Işık Üniversitesi, 2019-08-01) Kaya, Burak Erkan; Hekimoğlu, Mustafa; Işık Üniversitesi, Fen Bilimleri Enstitüsü, Endüstri Mühendisliği - Yöneylem Araştırması Yüksek Lisans ProgramıSecondary markets are easily accessible market-places for every participant of a product market, where usually lower prices and shorter lead times than the Original Equipment Manufacturer (OEM) are o?ered. Especially when price is dynamic, determining procurement amount is very important for the OEM who wants to maximize pro?t in existence of secondary markets. The goal of this study is to put an approach forward for maximizing pro?t of the OEM by taking into consideration price and procurement amounts from di?erent suppliers. We consider a trade environment in which OEM is not only a seller on secondary markets but also a buyer. We propose 2 single period additive non-linear maximization models by taking into consideration access priority of the OEM or Price Sensitive Customers (PSC) to secondary markets. We examine proposed models analytically and analyze one of them with Karush-Kuhn-Tucker (KKT) conditions. Due to analytical impracticalities faced in numerical experiments a brutal force search algorithm is applied under some assumptions. Our research provides some managerial insights about inventory management and pricing by considering some parameters as constant. We show e?ects of procurement from di?erent supply sources under our assumptions.
