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    Analysis of a hypothetical humanitarian supply chain with agent-based simulation: The expected Istanbul earthquake
    (CRC Press, 2024) Usluer, Furkan Onur; Sezen, Hayrettin Kemal; Şeneras, Arzu Eren
    All humanity has tragic memories and experiences of disasters. Disasters are low-probability events. In most cases, it is impossible to predict exactly when and where they will occur and what will be the devastating effects. However, many improvements can be made to reduce losses. According to estimates, as many as 2.5 million people may need emergency shelter after the expected Istanbul earthquake. The focus of this study is a hypothetical humanitarian supply chain to provide food and water to people in need of emergency shelters. An agent-based simulation (ABS) is created for the analysis. Software for the ABS model was developed with the Python programming language. Among agent-oriented software engineering methodologies, situational method engineering was chosen as a programming approach in the software development process. Agents of the model are smart objects that can have behavioral traits such as "parent", "mentally disabled", and "opportunist". The results indicate that panic among people can hinder the success rate of aid efforts, and relief operation plans that overlook individual differences are more likely to be unsuccessful.
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    DİJİTİZASYON, DİJİTALİZASYON, DİJİTAL DÖNÜŞÜM KAVRAMLARINA İLİŞKİN BİR DEĞERLENDİRME
    (2022) Sezen, Hayrettin Kemal; Eren Şenaras, Arzu
    Kavramlar bazen çok iyi nedenlerle farklı kişilerce farklı anlamlarda kullanılabilmekte ya da anlamları zaman içinde değişebilmektedir. Dünya bilgi - bilişim çağı olarak da adlandırılan bir dönemden geçmektedir. Bilginin yaratılma, toplanma, saklanma, işlenme, iletilme yol ve yöntemlerinde analogdan sayısala bir dönüşüm olmuştur. Otomasyon, nesneler interneti, dijitizasyon, dijitalizasyon, dijital dönüşüm, bilgi sistemleri, bilgi işlem, bilişim günümüzde sık kullanılan, ekonomi ve toplum üzerindeki etkileri yüksek sözcüklerdir. Bunlardan dijitizasyon, dijitalizasyon ve dijital dönüşüm sıklıkla biri diğeri yerine kullanılabilen, ara sıra uygunsuz ya da yanlış anlamlarda kullanılan üç kavramdır. Bu üç kavram için literatür ve günlük konuşma dilinde bir kavram kargaşası vardır. Çalışmada insanlığın zaman içindeki teknolojik birikimine, yıkıcı toplumsal dönüşümdeki etkili bilgi keşiflerine göz atılmış, dijitizasyon, dijitalizasyon ve dijital dönüşüm sözcüklerinin anlam ve tanımlarına yönelik literatür taraması yapılıp bulgular sunulmuştur. Kavramlar arasındaki kargaşanın giderilmesine destek amaçlı; dijitizasyon, dijitalizayon ve dijital dönüşüm aralarındaki farklar tartışılıp, belirginleştirilmeye çalışılmıştır. Son olarak dijital dönüşümün ekonomi ve toplum üzerindeki etkileri ile dönüşümde stratejinin önemine değinilmiştir.
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    The formulation of a linear programming model for the vehicle routing problem in order to minimize idle time
    (Regional Association for Security and crisis management, 2020) Çam, Ömer Nuri; Sezen, Hayrettin Kemal
    The paper deals with the question, "What is the Vehicle Routing Problem, Which Is Minimized Idle Time, and How Its Linear Programming Model Is Written?" In this study, a linear programming (LP) model has been developed for the vehicle routing problem (VRP) in order to minimize the total idle time (MIT). This problem was realized while managing the route operations of a company transporting long-distance passengers by bus in Turkey. The differences between this problem and other VRPs first arise from its objective function. It suggests that vehicles should work more because they make profit if they work. So, its objective function should be defined so as to minimize the sum of the idle time of those vehicles. Contrary to the VR problems examined so far, vehicles should work more, sometimes preferring long-distance routes as well. The other two differences pertain to constraints: Some locations should be visited more than once in different time periods, and subtours could be allowed in some situations. In order to present the problem, a total of 34 routes of the company which belongs to one of the five subgroups were chosen for the samples. To solve this kind of problems, it is very important that exact methods, such as linear programming or branch and bound, should be used. © 2020 Regional Association for Security and crisis management. All rights reserved.
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    Shortest route application via dynamic programming in the transportation networks
    (2021) Şahin, İnanç; Şenaras, Arzu Eren; Sezen, Hayrettin Kemal; Şenaras, Onur Mesut
    The purpose of this study is to develop an application for finding the shortest path in the transportation sector. The application was developed using the dynamic programming method in MS Excel Visual Basic application. These types of problems are also called stagecoach problems. The purpose of the problem is finding the shortest path between the starting point (node) and the destination point. Values are related to the roads in the network to specify the distance between two nodes. In case of a small number of nodes (activities), a solution can be reached by evaluating all options. But the number of possible options to be scanned for real problems is quite large. In such cases, a suitable method is needed for the solution. It can produce effective solutions with the dynamic programming approach.
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    System dynamics modelling for policy design: A case study in Turkey
    (IGI Global, 2019) Şenaras, Arzu Eren; Sezen, Hayrettin Kemal
    The system dynamics model was developed in the Vensim software. The model was developed based on the Yamaguchi study. The construct and behavioral validity of the model were addressed. Construct validity means that the correlations that construct the model, that is, the "rationale" of the model, are consistent with the correlations in the real system. There were five sub-models in the model. These were manufacturers and consumers sub-model, banks sub-model, central bank submodel, balance of payments sub-model, exchange rate market sub-model. Five sub models included in the model developed with the VENSIM software are included in the appendices. © 2020, IGI Global. All rights reserved.