Fahrettin Eldemir

Jeddah University

The Transport sector is of pivotal importance for the economy and development of the countries. Recently, different digital technologies have been used to enhance the efficiency and competitiveness in transportation. In light of this context, this paper investigates the impact of digitalization in the transport sector by employing the input receive...

Due to high competition in the aviation industry, cost reduction comes into prominence and becomes more critical each day. An efficient maintenance and spare part inventory management system that operates based on a reliable demand forecasting mechanism can significantly reduce operation costs. However, the conventional forecasting methods in the l...

Logistics centers are providing integrated services. Due to they are the central points of the logistics activities, these facilities have considerable influence over logistic structure of the cities. Therefore, using spatial data is a way to use the power of the data science instead of considering limited parameters in determining their location....

Public transport routes (especially urban bus routes) may become tedious and lengthy due to undesired deviations from the target destination directions. This makes public transport less attractive compared to other modes. Optimization of bus route layouts (under the name of rationalisation) ought to concentrate on, primarily, the quantification of...

The advantages of logistics centers for companies, cities, and countries have been discussed in the literature and generally mathematical model-based evaluations besides multi-criteria approaches are proposed for site selection processes. However, since mathematical modeling of multiple site selection often turns out to be NP-hard problem structure...

Fishing ports are the vital constituent of the fishery industry of Turkey. With governmental contribution, the number of the fishing ports reached to 366 alongside of the shores and the collected fish volume has been in increasing trend. However, there are differences in the location characteristics and technical infrastructure so that each facilit...

Trafik planlamasında mevcut şebeke altyapısı dikkate alınarak trafik planlaması yapılmaktadır. Bu planlama yapılırken trafikteki yoğunluklar kontrol edilmeye çalışılmakta, trafiğin zaman ve maliyet kaybı üzerindeki etkisi azaltılmaya çalışılmaktadır. Ancak trafiğin oluşturduğu zaman ve maliyet kayıplarının haricinde planlamalarda göz ardı edilen so...

Bisiklet kullanıcıları İstanbul'da genellikle spor ve sosyal etkinlik olarak bisiklet kullandıklarını ifade etmektedirler. İstanbul'un dünyanın en güzel şehirlerinden bir tanesi olarak adlandırılması bu tercihin nedenini ortaya koysa da, İstanbul'un engebeli yapısının bisiklet kullanımı için çok da uygun olmadığı düşünülebilir. Dolayısı ile coğrafi...

Contemporarily, globalization causes increase in competitions and this fact leads the companies having to focus on their specialties in order to gain competitive advantage. In today's market conditions, the decision making process has become more complicated due to improvements in options, targets and environmental conditions parallel to technology...

The private sector assumes that logistics centers create cost benefits for their operations. On the other hand, the public sector also assumes that logistics sectors maintain harmony with an aim to improve the logistics network structure and efficiency. In Turkey, nineteen logistics centers are on-going to develop a system approach and integrate di...

While establishing a new health facility, such as hospitals, multiple factors should be taken into consideration. Due to the variety, the impacts of these factors on location decision should be evaluated initially. Then, spatial effects of the location factors on the plane should be determined to reach an acceptable decision. These factors can be c...

Location analysis for a textile manufacturing facility is a strategic decision due to its longterm effects on profitability, accessibility, and sustainability. Thus an analysis should be made using a comprehensive approach. The facility location selection problem can be represented with a multi-criteria structure. This study considered locating a n...

Hot spots can be described as the high attraction points. Defining the hot spots and clustering approaches in a metropolitan area helps to provide solutions for balancing the freight flows between the sub-areas in the city center. It also helps to provide solutions for secondary problems, such as traffic congestion and air pollution. The techniq...

Toplu taşıma sistemlerinin ana ekseninde yer alan ve dünyada yaygın olarak kullanılan otobüs sistemlerinin hızları farklı metotlarla ölçülmektedir. Araç yol bilgisayar kayıtları, GPS araç takip sistemleri, ORER kayıtları gibi uygulamalar bu metotlardan birkaçıdır. Çalışma kapsamında İstanbul’un toplu taşıma sisteminde faaliyet gösteren otobüslerde...

Toplu taşıma sistemlerinin ana ekseninde yer alan ve dünyada yaygın olarak kullanılan otobüs sistemlerinin hızları farklı metotlarla ölçülmektedir. Araç yol bilgisayar kayıtları, GPS araç takip sistemleri, ORER kayıtları gibi uygulamalar bu metotlardan birkaçıdır. Çalışma kapsamında İstanbul’un toplu taşıma sisteminde faaliyet gösteren otobüslerde...

The Order Accumulation and Sortation Systems (OASS) are becoming more important as distribution centers try to gain competitive advantages. There are certain key parameters that affect the performance of Sortation Systems. The effect of these parameters can be measured by how they are affecting throughput or average sortation time. The time require...

Maintenance is an inevitable reality in industry. Not only its close relationship with safety but also its direct and indirect costs make it attractive for companies and researchers. Initially, the focus for maintenance research was on the periodic maintenance, mainly targeting the identification optimum maintenance period. A new concept of mainten...

The Order Accumulation and Sortation Systems (OASS) are getting more important as distribution centers try to gain competitive advantages. The parameters that affect the sorting time in OASS are analyzed in this study. The length and speed of conveyors, sending the packages within a wave, the wave size, number of the sorting lanes and the sorting s...

Istanbul Strait is one of the most crowded, narrowest straits in the world. Even though the number of accidents has been decreased in recent years, the risk is still high. Simulation of marine traffic in Istanbul Strait is very important to be able to see the effects of different management strategies and possible changes in the parameters that aff...

The present paper addresses the determination of decision parameters in conceptualizing automated palletizing systems (APS). Conceptualizing is the process of developing an initial system design solution for a complex real-world material-handling problem. Such an initial solution is preliminary in nature and reflects the interaction between the pro...

New analytical models supporting the design conceptualization of automated storage and retrieval systems are proposed. They include an analytical cycle time model for automated storage and retrieval systems using dedicated storage and computationally efficient procedures for estimating space requirements with systems using randomized or class-based...

The throughput performance model and the state equation model are alternative analytical approaches for determining the proportion of dual versus single command crane cycles in automated storage and retrieval systems that utilize opportunistic interleaving. The different assumptions underlying these models result in biases in the estimation of expe...