No abstract

There are various stages to the process of acquiring a vessel. First, a decision must be made on what vessel is needed. Next, an appropriate shipyard is selected; this decision is very significant, as it will determine the workmanship quality and delivery date of the vessel to be manufactured. From the point of view of a shipowner, receiving the vessel on time and manufactured to specification is crucial. From the point of view of the shipyard, it is vital to take as many orders as possible; therefore, one of the highest priorities of shipyards is to be the first choice for as many shipowners as possible in order to increase their requirement for steel fabrication and consequently their profits. In this study, the shipyard selection criteria for shipowners are presented and the degree of importance of each criterion is determined using a fuzzy analytic hierarchy process (AHP) technique. The aim of the study is to provide shipyards with information about the perspective of shipowners with regard to the shipyard selection process, thus allowing shipyards to strengthen their weaknesses and increase the number of shipowners which choose them to manufacture their ships.

In a shipyard production system, launching operation is vital process since launching stage is time consuming process as well as being high cost. Therefore, this is a significant issue for shipyards. Choosing the most appropriate one among launching methods gives an advantage to shipyards to obtain competitive power against their competitors. If this is done, shipyards can commit to delivery of more ships and make more profit. In this study, launching methods are evaluated in terms of various performance criteria by means of an integrated method including Analytic Hierarchy Process (AHP), Fuzzy Information Axiom (FIA), Technique for Order Performance by Similarity to Ideal Solution (TOPSIS), and Strengths, Weaknesses, Opportunities, and Threats (SWOT) analyses. Then, the dry docking technique was determined as the most convenient launching method with respect to the conflicting criteria.

Shipyards have large departments or facilities. It is essential to make an effective topological layout plan since the initial investment cost of these departments is high. Topological layout is an optimization problem and Genetic Algorithm (GA) is generally used in the literature. The selection of effective genetic algorithm approaches and operators are very important to improve the performance of the optimization. This study investigates an effective solution to the shipyard topological layout using a Quadratic Assignment Problem (QAP) model with classic and elitist GA approaches. Besides, genetic operators that have significant effects on exploitation and exploration capabilities are analyzed. Therefore, 126 experiments were run with 13 different operators. The results obtained from the classic and elitist GA approach were evaluated individually and compared with each other. It was observed that the elitist GA approach has a superior performance compared to the classic GA approach. This study is the most comprehensive and practical study on the performance of the GA for topological layout of the shipyard in the literature.

TRABZON LĠMANI ELLEÇLEME EKĠPMANLARININ YAKIT TÜKETĠM MALĠYETLERĠ ÜZERĠNEBĠR ARAġTIRMA ÖZ Limanda yüklerin gemiden karaya indirilmesi, taşınması, depolanması, taşıtlara yüklenmesi, taşıtlardan indirilmesi, karadan gemiye konulması gibi birçok işlem dizel yakıt kullanan elleçleme ekipmanları ile birlikte yapılabilmektedir. Limandaki gemi trafiği arttıkça limanda bulunan elleçleme ekipmanlarının çalışma süreleri uzamakta ve buna bağlı olarak yakıt tüketimleri artmaktadır. Dizel yakıtları birçok alanda kullanılmakta ve ülke ekonomisinde önemli bir yer teşkil etmektedir. Petrolün her geçen gün azalması, petrol krizleri ve ülkemizde petrol fiyatlarının gün geçtikçe artması liman yönetimleri için de kayda değer bir maliyet oluşturmaktadır.Bu çalışmada Trabzon Limanında elleçleme yapan ekipmanların yıllara göre yakıt tüketim maliyetlerindeki değişim tespit edilmiş ve regresyon analizi yöntemi kullanılarak gelecek yıllara yönelik tahmin yapılmıştır. Çalışmada kullanılan gemi istatistikleri ve liman elleçleme ekipmanları yakıt tüketim verileri Trabzon Liman Müdürlüğü operasyon biriminin kayıtlarından elde edilmiştir. Çalışma sonucunda, ekipmanlar için kullanılan yakıt miktarı azalsa da petrol fiyatlarında hızlı artıştan dolayı maliyetlerin arttığı tespit edilmiştir.Anahtar Kelimeler: Yakıt Tüketimi, Elleçleme Ekipmanları, Trabzon Limanı, Regresyon A RESEARCH ON FUEL CONSUMPTION COSTS OF HANDLING EQUIPMENT IN TRABZON PORT ABSTRACTOperations such as unloading goods from ship to the land, transporting, storing, loading to vehicles, unloading from vehicles and loading from land to ship, are carried out by various handling equipment, which use diesel fuels. As the ship traffic increases, operation time of the handling equipment extends and consequently, fuel consumption increases. Diesel fuels are used in several fields and are important parameters for the economy of the country. Day by day decreasing of the petroleum resources, petroleum crises and increasing petroleum prices are remarkable costs for port managements. In this study, yearly changes of consumption costs of the handling equipment in Trabzon Port were identified and projections for future years were made by using regression analysis method. The number of vessels and port handling equipment of the fuel consumption amount of data used in this study were obtained from the records of the operation unit Trabzon Port Management. As a result, although the amount of fuel used for equipment is decreasing, costs are rising due to the rapid increase in oil prices.