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Yayın An effective maintenance policy for a multi-component dynamic system using factored POMDPs(Springer Verlag, 2019-09-20) Kıvanç, İpek; Özgür Ünlüakın, DemetWith the latest advances in technology, almost all systems are getting substantially more uncertain and complex. Since increased complexity costs more, it is challenging to cope with this situation. Maintenance optimization plays a critical role in ensuring effective decision-making on the correct maintenance actions in multi-component systems. A Partially Observable Markov Decision Process (POMDP) is an appropriate framework for such problems. Nevertheless, POMDPs are rarely used for tackling maintenance problems. This study aims to formulate and solve a factored POMDP model to tackle the problems that arise with maintenance planning of multi-component systems. An empirical model consisting of four partially observable components deteriorating in time is constructed. We resort to Symbolic Perseus solver, which includes an adapted variant of the point-based value iteration algorithm, to solve the empirical model. The obtained maintenance policy is simulated on the empirical model in a finite horizon for many replications and the results are compared to the other predefined maintenance policies. Drawing upon the policy results of the factored representation, we present how factored POMDPs offer an effective maintenance policy for the multi-component systems.Yayın Designing an interactive non-linear documentary contributed by public participation suburbs of Istanbul(Association for Computing Machinery, 2020-07-03) Çevikayak Yelmi, Pınar; Bayar, TuluSuburbs of Istanbul is a web-based interactive documentary project that examines the identity of suburban neighborhoods in Istanbul through the participation of its residents via online submission of their visual and written stories. Public participation also led the design process and helped prototype the interfaces of this non-linear documentary. This project aims to contribute to the field of interactive documentary and non-linear storytelling by integrating participatory design techniques in the prototyping process of documentary interfaces. Involving public both as content providers and as active decision makers in design process lead to a more genuine outcome with a human-centered approach. This project also intends to create an interactive experience to provide a greater insight into rapidly changing lifestyles of Turkish people, to provide a global context to the stories presented, and to generate widespread awareness of issues surrounding suburban lifestyles across the world.Yayın Statistical analysis of bus transportation networks of Istanbul(World Scientific Publishing Co Pte Ltd, 2016) Çoban, Veysel; Atan, Sabri TankutTransportation networks such as railway, airport and bus networks are the real-world networks whose inherent statistical properties characterize and differentiate the networks. In order to understand the network characteristics of bus transportation networks (BTNs) of Istanbul, we analyzed its network properties such as degree distributions, clustering coefficients and assortativity. BTNs of Istanbul is defined into three networks as the existence and nonexistence of the metrobus and existence of third- bridge. They are also graphically represented within C-, L- and P-Space topologies that are defined with the connection of the bus stops or routes. Statistical results obtained from network properties reflected the characteristics of the BTNs of Istanbul and give an information about the effects of the metrobus lines and third bridge on the BTNs in Istanbul.Yayın LLM’leri kullanarak otel incelemelerini görüntü manipülasyonu ile görselleştirme(Institute of Electrical and Electronics Engineers Inc., 2025-08-15) Özdemir, Ata Onur; Giritli, Efe Batur; Can, Yekta SaidDijital çağda müşteri yorumları, özellikle otelcilik sektöründe, karar verme sürecinde önemli bir rol oynamaktadır. Metin tabanlı yorumlar değerli bilgiler sunsa da, potansiyel müşteriler genellikle öznel ifadeleri doğru şekilde yorumlamakta zorlanmaktadır. Araştırmalar, görsel temsillerin anlaşılırlığı artırdığını ve kullanıcı etkileşimini güçlendirdiğini göstermektedir. Bu çalışma, metin tabanlı görüntü manipülasyonu ile yazılı otel yorumlarını orijinal otel görselleri üzerinde değişiklikler yaparak görsel incelemelere dönüştürmeyi amaçlamaktadır. Stable Diffusion modeli kullanılarak yazılı otel yorumları girdileriyle otel odası görüntüleri manipüle edilmiştir. Manipüle edilen görsellerin değerlendirilmesinde SSIM (Structural Similarity Index Measure) ve PSNR (Peak Signal-to-Noise Ratio) metrikleri uygulanmıştır. Ayrıca, manipüle edilmiş ve orijinal görüntü örnekleri karşılaştırmalı olarak sunulmuştur. Sonuçlar, modelin küçük ölçekli değişikliklerde başarılı olduğunu, ancak büyük değişikliklerde kalite kaybı yaşadığını göstermektedir.
