Umut Rıfat Tuzkaya Tuzkaya

Yıldız Technical University · Department of Industrial Engineering

For many firms, the key to improve competitiveness is their ability of research and development (R&D);therefore the R&D project selection is an essential decision process for them. In this study, we worked on R&D Project Selection issue and performed an implementation for a home appliances company. Wefirst discussed important criteria for R&D proje...

Urgent response is vitally important after unpredictable disasters and it is highly dependent to the location of the emergency centers. Considering this importance degree, in this study, a location selection methodology for emergency logistics centers (ELCs) is proposed. There are various influencing factors or criteria to choose the most convenien...

In many industries, distribution activities are realised in a dynamic environment including uncertainties. Besides, adding transportation mode alternatives, inventory-stocking opportunities in wholesalers, unmet demand permission in distribution centres, etc. increase the difficulty of problem modelling and solving for large-scale networks. In this...

We try to determine the best location for a bus garage, in which maintenance and repair activities are operated, for public transportation system in Istanbul. An integrated multicriteria decision making technique (MCDM) is used to obtain reliable results. Firstly, various criteria related to garage location selection are specified and weighted by f...

Transportation costs have an important effect on companies’ competition capability in various sectors. To realize a positive effect, transportation industry should provide some specific performance criteria related with the economical efficiency and service quality. Also an increase in this performance degree depends on the obtaining optimum result...

In this study, outcomes of implementing the agile methodologies to software application development are discussed. An integrated multi-criteria decision making technique is used to obtain reliable results. Firstly, various criteria related with project management methodology are defined by using SWOT. Then selection criteria are specified and weigh...

Distribution network design is both strategic and tactical level problem that deals with the alternative locations selection, assignment of the customers to suppliers, and determining the product flow quantities among the echelons. There are various factors that affect decisions on this problem such as transportation mode availability, lead times,...

Supply chain performance measurement is vital for the continuous improvement of supply chain management. Effective supply chain performance measurement is one of the most important aspects for supply chain management in which decision makers can analyze the historical performance and current status, and set future performance targets. This chapter...

During a medical emergency in the USA, critical medical supplies such as medications, vaccines, gloves, masks and ventilators, are delivered to one location within each state. The state and local governments are responsible for delivering the supplies from this location, called the receiving, staging and storage (RSS) site to the points of dispense...

The layout design of distribution center should be considered as a smart decision system that includes the number of customers, demand forecasting, product groups, condition of product conservation, warehousing, transportation management etc. Decision support systems are used on a lot of stages of the layout of the distribution center which is hand...

Tools and machines have an important effect on the manufacturing operationsr effectiveness and the selection process of appropriate tools and machines is a complex issue with the consideration of multiple criteria. Considering the complexity of the problem area and the difficulties in machine tools evaluation processes, the main purpose of this stu...

The concept of a supply chain exists for over twenty years but partners and configuration selection process still is rather unstructured. In order to increase value in any supply chain, a more comprehensive and integrative approach is required to select the right partners and establish the right configuration along the chain. Under economic growth...

The efficient use of the available resources is very important for a country's economical and political development. Energy is the main component of the natural resources of industrialized and developing countries. Since Turkey is not an oil or a natural gas producing country, her current energy resources should be allocated to the appropriate ener...

In this study, a facility layout problem having NP-hard problem characteristic is attempted to be solved by using two different meta-heuristic approaches—Genetic Algorithm (GA) and Simulated Annealing (SA)—and a hybrid approach—Genetic Algorithm/Simulated Annealing (HGASA). The case study is completed for a company which can be seen as a small or a...

In this case study, a real world problem of a production firm in the Marmara Region, Turkey was considered. In the current situation, the firm works with different third-party logistics firms and uses different ports each time. However, they have some quality problems and decided to work with a logistics firm by using the most convenient port alter...

In this paper, a multi-objective model for aggregate production planning is presented which includes two objectives: (1) minimized cost and (2) minimized effect on the workforce motivation level caused by hire/layoff decisions. Then, six strategies are considered and the most appropriate one is determined to structure the plan. These strategies are...

Increasing environmental problems enforce companies to be more environmental responsible. A company's environmental performance is not only related to the company's inner environmental efforts, but also it is affected by the suppliers' environmental performance and image. As a stakeholder of the company, a supplier with bad environmental image affe...

The supply chain (SC) is often defined as a network that is composed of different functions, including suppliers, manufacturing plants, warehouses/distribution centers, retailers and customers. A supply network (SN) is a sequence of different and multiple numbers of functions and individual functional units that must satisfy all capacities and dema...

The increasing needs for transportation of freight and passengers causes environmental impacts. Preventing studies for these impacts should be considered by logistics firms and encouraged by the regulations of authorities. An important contribution can be provided by determining the environmental effects of the transportation modes in specific regi...

Locating an undesirable facility is a sophisticated problem, for the evaluation procedures involve several objectives and the solution to the problem calls for some compromises to be made between probable conflicting criteria. This paper addresses the problem of undesirable facility location selection using the analytic network process (ANP), a mul...

A case study examining the different modes for transportation of freight by a Turkish logistics-service provider company is presented herein. A number of conflicting qualitative and quantitative criteria exist for evaluating alternative modes of transport. Qualitative criteria are often accompanied by ambiguity and vagueness. To cope with ambiguity...

Energy is the main component of natural resources of developing, as well as developed, countries like Turkey. Because of economic and social developments, the demand for energy, in general, has increased considerably in Turkey. Since Turkey is not an oil or natural gas (NG) producing country, the energy resource usage for energy consumption should...

Warehouse operation and management is one of the essential parts of manufacturing and service operations. The warehouse layout problem is a key to warehouse operations. Generally, warehouse layout design models attempt to optimize different objectives such as the orientation of storage racks, the allocation of space among competing uses, the number...

In this study, an integration of the analytic hierarchy process (AHP) and a multi-objective possibilistic linear programming (MOPLP) technique is developed to account for all tangible, intangible, quantitative, and qualitative factors which are used to evaluate and select suppliers and to define the optimum order quantities assigned to each. A mult...

Facility Layout Design (FLD) has a very important effect on the performance of a manufacturing system. The concept of FLD is usually considered as a multi-objective problem. This paper presents a decision-making methodology based on Data Envelopment Analysis (DEA), which uses both quantitative and qualitative criteria, for evaluating FLD. The crite...

This study has shown that data mining can be used to prepare the useful data for multi-objective layout problems. The required data in designing a facility layout procured by the production model of an ERP system, which includes MPS prepared according to demand forecasts and orders. Inte-grating this data with BOM and inventory levels, MRP is run t...

Today, growing amounts of waste due to fast consumption rate of products started an irreversible environmental pollution and damage. A considerable part of this waste is caused by packaging material. With the realization of this fact, various waste policies have taken important steps. Here we considered a firm, where waste Aluminum constitutes majo...

It is difficult to evaluate projects in R&D department according to varied measures. The main problem of achieving long-term objectives is to calculate only financial measures and not to measure the organization's progress. Traditionally, connecting non-financial measures to the economic objectives is a competitive task. The Balanced Scorecard (BSC...

The study summarizes the tasks of a supply chain's main functional units which are transportation and warehousing. Considering some similarities between holonistic systems and supply chain systems, an integrated framework is constituted via holonistic approach and a linear programming model to maximize profit of not only the overall supply chain bu...