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Robust Static Output Feedback H? Controller Design for Linear Parameter-Varying Time Delay Systems
No full textThis paper addresses the problem of synthesizing an H infinity static output feedback controller for linear parameter-varying (LPV) time delay systems subject to time-varying delay. The motivation for this research stems from the challenges associated with designing controllers for such systems. In addition to considering the static output feedback controller design, we also explore the design of a dynamic output fee back controller within the context of H-infinity control. This is achieved by augmenting the system dynamics with the inclusion of the dynamic controller state and form lating the dynamic output feedback controller in an equivalent form of static output feedback control for the overall system. To tackle the synthesis problem, a quadratic Lyapunov-Krasovskii functional is selected, and a sufficient matrix inequality co dition is developed by utilizing the well-known Jensen-type integral inequality. This approach enhances the robustness of the controller design and accounts for the time varying delay characteristics of the system. An iterative algorithm is introduced to efficiently search for a potential feasible solution set of the synthesis problem. The effectiveness of the proposed controller design methods is demonstrated through several numerical examples. The application of the proposed approaches is showcased, and a comparative analysis is performed. Specifically, the results are compared with the existing approaches in the literature, considering both dynamic output feedback controllers and static output feedback controllers for H-infinity control. This comparison highlights the advantages and differences of the proposed methodology. Overall, this research contributes to the field by offering systematic methodologies for synthesiing H-infinity static output feedback controllers for LPV time delay systems subject to time-varying delay. The incorporation of dynamic output feedback controller design provides additional insights and flexibility. The numerical examples validate the applicability of the proposed methods and underscore their potential advantages in terms of robustness and performance
Examining outcomes of sport mega-event bidding for national sports development - The case of Turkey's bidding for the UEFA EURO 2024
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Rewriting history: directorate of communications and neo-Ottoman ideological recasting of Turkey's history
No full textThis study presents a multimodal discourse analysis of three historical videos produced by the Presidency of the Republic of Turkiye Directorate of Communications. The Directorate, chiefly operating as a partisan bureaucratic-cum-political apparatus of the ruling political party in Turkey, the Justice and Development Party, produces videos to recast the history of Turkey in line with the ruling party's neo-Ottomanist, nationalist, militarist, and Islamist agenda. These three videos reviewed refer to the discursive building blocks of the AKP's so-called Islamic populist worldview in recent years: the glorious Ottoman past, accumulation and glorification of military power, and a holy cause. The historical repository used in the videos reasserts the loneliness of Turkey, the utmost belief in and dedication to the nation's leader, Turkey's emergence as a regional power, and the primacy of the nation's will. The article discusses the authoritarian and exclusionary implications of the misuse of history by official agencies
Developing a hybrid methodology for green-based supplier selection: Application in the automotive industry
No full textThe green performance values of businesses are of great importance in terms of sustainability, which includes long-term economic, social, and environmental effects. Thus, today, enterprises and managers are increasingly interested in this issue, and related topics, including supplier selection, have been inserted into decision-making procedures. However, how to predict the effects of green performance criteria, which represent environmental sustainability, on social and economic sustainability remains unclear. In this regard, the main purpose of this research is to develop a supplier selection methodology considering green performance criteria by applying multiple regression analysis and the Evidential Fuzzy Multi-Criteria Decision Making (F-MCDM) method based on Dempster-Shafer Theory (DST), which are both powerful methods in statistical analysis and decision-making under uncertainty. In the first phase of the research, variables that significantly affect green performance have been determined by testing the eight generated hypotheses with multiple regression analysis. Then, the best supplier was determined using those green supplier selection criteria in the Evidential F-MCDM method. Since using environmentally hazardous paints in the production process continues, the automobile paint production sector has been chosen as the application area of this green-based supplier selection methodology. In this respect, green dynamic capacity, green purchasing, eco-design, investment recovery, and green product innovation variables have been inserted into the Evidential F-MCDM method as the determinant variables of green performance. This research reveals that integrating multiple regression and Evidential F-MCDM methods can be a hybrid methodology in supplier selection. Thus, a different perspective is introduced into the green supplier selection decision-making process by considering the effects of criteria in the MCDM model on green performance. This innovation enhances the criteria determination and selection processes in classical MCDM approaches. In addition, green dynamic capacity is the most critical criterion in supplier selection based on their green performance, especially in the scope of this research
Duo autoethnographic approach to peer-to-peer collaboration in PhD process
No full textThis debate demonstrates two PhD students’ joint work in altering an often-isolated learning experience through interactions and collaboration with one another. As qualitative researchers, we formed a peer support system that began at the start of the PhD program and has continued to this day in the thesis writing process. During their doctoral program at Bilgi University, the peer authors encountered a unique sort of collaboration that evolved naturally and organically. By utilising duo autoethnography, the goal of this chapter is to identify and examine the impact of organic collaboration and peer-to-peer support on doctorate student completion. Concurring on the idea that peer collaboration is a key component in academic success and student performance, especially within higher educational doctoral programs and improvement of completion rates in doctoral programs, peer authors will visit the meanings and boundaries of the listed conceptual frameworks, driving from their own experiences. © 2024 selection and editorial matter, Begüm Irmak, Can Koçak, Onur Sesigür and Nazan Haydari; individual chapters, the contributors
Datasets and methods of product recognition on grocery shelf images using computer vision and machine learning approaches: An exhaustive literature review
No full textA product recognition system recognizes all products on the shelf images and determines their positions. A business equipped with an automatic product recognition system has a convenient follow-up of many human-powered activities while increasing customer satisfaction. That is, product recognition stands out with its benefits such as tracking shelf layouts and stocking their status, and improving the shopping experience for customers, especially the visually impaired ones. However, product recognition is a challenging problem of computer vision in terms of the difficulty of obtaining and updating datasets and the breadth of the product scale. On the other hand, the number of studies on product recognition is constantly increasing by using various computer vision and machine learning methods, and effective solutions are offered to this problem. This paper provide a comprehensive review in the field of researches of product recognition on grocery store shelves. In this article, data sets and approaches used in the literature for the development of an automatic product recognition system are examined and compared, and their benefits and limitations are commented. Finally, a guideline is provided for future researchers and new perspectives for future studies are presented. © 2024 Elsevier Lt
İşletme sermayesi yönetiminin firma karlılığına etkisi: Türkiye'nin sektörel bir analizi
No full textLisansüstü Programlar Enstitüsü, Finans Ana Bilim Dalı, Finansal Ekonomi Bilim DalıBu tez, Türkiye'deki imalat, tarım ve taşımacılık ile depo sektörlerine odaklanarak işletmelerin karlılığı üzerindeki işletme sermayesi yönetiminin (WCM) etkilerini araştırmaktadır. Panel veri metodolojisi kullanılarak, 2017-2021 yılları arasında EMIS'ten toplanan 954 Türk şirketine ait finansal veriler analiz edilmiştir. Alacak devir hızı, stok devir hızı ve nakit dönüşüm döngüsü (CCC) gibi anahtar metrikler, karlılık üzerindeki etkilerini değerlendirmek için incelenmiştir. Bulgular imalat sektöründe, CCC ile işletme karlılığı arasında önemli bir negatif korelasyon olduğunu, yani etkin WCM'nin karlılığı artırdığını ortaya koymaktadır. Çalışmada, firma büyüklüğü, borç oranı ve satış büyümesi gibi faktörler kontrol edilerek hem tek değişkenli hem de çok değişkenli analizler kullanılmaktadır. Sonuçlar, sektöre özgü WCM stratejilerinin karlılığı optimize etmek ve hissedar değeri yaratmak için gerekli olduğunu vurgulamaktadır. Çalışma, Türkiye'den ampirik kanıtlar sunarak mevcut literatüre katkıda bulunmakta ve çeşitli sektörlerde etkin WCM uygulamalarının önemini vurgulamakta, farklı ekonomik ortamlarda bu dinamikleri keşfetmek için daha fazla araştırma yapılmasını önermektedir.This thesis investigates the effects of working capital management (WCM) on firms' profitability, focusing on the manufacturing, agriculture, transport and warehouse sectors in Türkiye. Utilizing a panel data methodology, the study analyzes financial data from 954 Turkish companies collected from EMIS between 2017 and 2021. Key metrics such as receivables turnover, inventory turnover, and the cash conversion cycle (CCC) are examined to assess their impact on profitability. The findings reveal a significant negative correlation between the CCC and firm profitability in the manufacturing sector, indicating that efficient WCM enhances profitability. The study employs both univariate and multivariate analyses, controlling for factors like firm size, debt ratio, and sales growth. Results emphasize the necessity of sector-specific WCM strategies to optimize profitability and create shareholder value. The study contributes to the existing literature by providing empirical evidence from Türkiye and underscores the importance of effective WCM practices across various sectors, advocating for further research to explore these dynamics in different economic environments
Accident insurances
No full textLisansüstü Programlar Enstitüsü, Hukuk Ana Bilim DalıÇalışmada amaç, Türk Özel Sigorta Hukuku'nun önemli branşlarından olan kaza sigortalarının düzenleniş şeklinin irdelenmesi ile birlikte uygulamada karşılaşılan ihtiyarî kaza sigortaları ile zorunlu kaza sigortalarının kıyaslanmasıdır. İhtiyarî ve zorunlu kaza sigortalarına ilişkin kıyaslama yapılırken, kazanın tanımı, kaza sigortalarındaki rizikolar ve sözleşme ile sigortalılara verilen teminat türleri incelenecektir. Çalışmanın ilk bölümünde, kaza sigortasının tarihçesine değinilerek kaza sigortalarının akdedilmesindeki amacın ve sözleşmeden elde edilmek istenen menfaate ilişkin değerlendirme yapılacaktır. Kaza sigortalarındaki rizikonun ortaya konulabilmesi adına sigorta sözleşmelerinde riziko ve menfaat terimleri incelenecek ve sigorta sözleşmelerinin unsurlarına yer verilecektir. Kaza sigortasının gelişim süreci de dahil olmak üzere hukuki niteliği tartışılacak ve Türk Özel Sigorta Hukuku nezdinde kaza sigortalarının kaynaklarına değinilerek kaza sigortalarına uygulanacak mevzuat hükümleri ile kanuni düzenleniş biçimi açıklanacaktır. Akabinde kaza sigortalarının kuruluşu, sözleşmenin kurulduğu an ve sözleşmenin şekli tespit edilecektir. İlk bölümde son olarak kaza sigortası sözleşmelerinin tarafları ve ilgililerine değinilecektir. İkinci bölümde ise kaza sigortalarının Türk Özel Sigorta Hukuku'nda sınıflandırılması ile türlerine ilişkin ayrım incelenecektir. Kaza sigortalarının kuruluş şekli ve amacına göre farklı sınıflandırmalara tabi olduğu görülmekle, uygulamada karşılaşılan ihtiyarî ve zorunlu kaza sigortası türleri ayrı ayrı açıklanacaktır. Her kaza sigortası türüne ilişkin mevzuat ve uygulamada karşılaşılan durumlar detaylandırılmakla birlikte benzer ve farklı yönleri de ortaya konulacaktır. Üçüncü ve son bölümde ise kaza sigortası sözleşmesindeki tarafların birbirine karşı sözleşmeden ve kanundan doğan borç ve külfetleri incelenecektir. Tarafların borç ve külfetlerine aykırılık hâlinde öngörülen yaptırımlar açıklanacaktır. Nihayette kaza sigortalarının sona erme şekilleri incelenecektir. Kaza sigortalarının tabi olduğu genel sona erme hâlleri ile birlikte kaza sigortalarında özel sona erme hâlleri ayrı ayrı değerlendirilecektir. Son olarak da taraflar arası kaza sigortası sözleşmesinden kaynaklı uyuşmazlıklar çıkması hâlinde, uyuşmazlık çözüm yollarına ilişkin mevcut imkânlar ortaya konularak çalışma sona erdirilecektir.The aim of the study is to examine the structure of accident insurances, one of the essential branches of Turkish Private Insurance Law, with comparison of the accident insurance types used in practice. While comparing accident insurance types, the definition of an accident, risks in accident insurances, and types of coverage through contracts will be discussed. In the first section, the history of accident insurance will be mentioned to create an output of accident insurance contracts and the requested final causes from the contracts. In order to explain "the risk" in accident insurances, terms such as "risk" and "benefit" in accident insurance contracts will be discussed. Also, the elements of insurance contracts will be analyzed. The legal scope of accident insurance and the sources of accident insurances in Turkish Private Insurance Law will be addressed by explaining the applicable legislative provisions and regulatory framework of accident insurances. Subsequently, the formation of accident insurances, and the legal form of the accident insurance contracts will be explained. Finally, the first section will detect the parties involved in accident insurance contracts. In the second section, the classification of accident insurances in Turkish Private Insurance Law and the distinctions relating their establishment types and purposes will be declared. As it is observed that accident insurances are subject to different classifications based on their establishment ways and main purposes willing from the contracts. After that the types of voluntary and compulsory accident insurances in practice will be separately explained. Legislation and situations encountered in practice related to each type of accident insurance will be detailed and voluntary and compulsory types compared by detecting the similarities and differences. In the third and final section, the contractual and legal obligations and burdens of the accident insurance contract parties regulated in 6100 numbered Turkish Commercial Code and each accident insurance general conditions will be instructed. The legal sanctions in the event of non-compliance with the counted liabilities of the parties will be determined. Finally, the general and special termination procedures of accident insurances will be stated. In conclusion, in case of disputes arising between the parties of contracts, available dispute resolution methods will be indicated
The tenant's early return of the lease in compliance with Article 325 of the Turkish Code of Obligation
No full textLisansüstü Programlar Enstitüsü, Özel Hukuk Ana Bilim Dalı, Özel Hukuk Bilim DalıÇalışmamızın konusunu, Türk Borçlar Kanunu'nun 325. maddesinde düzenlenen kira sözleşmesinin sona erme hallerinden biri olan kiralananın erken iadesi oluşturmaktadır. Konuyu tercih etmemizdeki motivasyon özellikle son yıllarda kiralananın erken iadesi ve bu durumun beraberinde getirdiği uyuşmazlıklara sıkça rastlanmasıdır. Çalışmamızda kapsamında yapılan incelemeler Türk Hukuku temel alınarak yapılmış olup çalışmamızda Yargıtay kararları ve öğretiden istifade edilmiştir. Çalışmamızın üç bölümden oluşmaktadır. İlk bölümde kira sözleşmesi sürekli edimli bir sözleşme olduğu için sürekli borç ilişkilerinin genel özellikleri ile sona erme halleri incelenmiştir. İkinci bölümde TBK m. 325'in genel özelliklerine, hukuki niteliğine ve şartlarına, üçüncü bölümde ise TBK m.325'in sonuçlarına yer verilmiştir.Our study focuses on the early return of the lease, which is one of the termination scenarios outlined in Article 325 of Turkish Code of Obligation for lease agreements. The motivation behind choosing this subject is the prevalence of early return of the lease and the disputes that frequently accompany these circumstances in recent years. The examinations conducted within the scope of our study are based on Turkish Law and, we have utilized Court of Cassation Decisions and legal doctrine. Our study consists of three sections. Considering the lease agreements are continuous performance agreements, the general characteristics and termination scenarios of continuous debt relationships have been addressed in the first section. In the second section, general characteristics, legal nature, and conditions set out in Article 325 have been examined. The third section provides an explanation for the consequences of the aforementioned article
PANDEMİNİN 11. AYINDA 112 ÇALIŞANLARINDA TRAVMA SONRASI STRES BOZUKLUĞU GÖRÜLME SIKLIĞI VE İLİŞKİLİ FAKTÖRLER
No full textObjectives: In this study, the prevalence of post-traumatic stress disorder and associated factors among 112 employees was determined in the 11th month of the COVID-19 pandemic, with the aim of preparing for pandemics expected to increase with climate change. Material and Methods: In this cross-sectional study, 440 paramedics randomly selected, and "Socio-demographic Information Form", "Life Events Checklist" and "Post Traumatic Stress Disorder Control Form" were used for data collection. Results: 49.5% of the participants were female and the mean age was 29.9±7.34. The prevalence of Post Traumatic Stress Disorder (PTSD) was 59.8%. Multiple regression analysis showed that approximately 25% of the total PTSD score was explained independently by general health situation and socio-demographic characteristics of paramedics, 27% by crisis management skills, long working hours, lack of equipment and traffic density, and 40% by difficult life events during their professional practice intervention such as gun injuries and being attacked by gunfire, sexual assault, brutal death and causing injury/death to another person from past traumatic experiences (p<0.05). Conclusion: Based on these findings, in order to prevent/control of PTSD in paramedics; it is thought that it would be beneficial to integrate mental health monitoring system into the health and safety program and to apply regular supervision and psycho- social support interventions for high-risk groups in terms of controlling individual and occupational factors of paramedics and to include them in health services’ disaster preparedness plans.Amaç: Bu çalışmada iklim değişikliğiyle birlikte artması beklenen pandemilere hazırlık amacıyla, COVID-19 pandemisinin 11. ayında 112 çalışanlarında travma sonrası stres bozukluğu prevalansı ve ilişkili faktörler saptanmıştır. Gereç ve Yöntemler: Kesitsel tipteki bu araştırmaya rastgele örnekleme yöntemiyle seçilen 440 paramedik katıldı. Veri toplamada "Sosyodemografik Bilgi Formu", "Yaşam Olayları Kontrol Listesi" ve "Travma Sonrası Stres Bozukluğu Kontrol Listesi" kullanıldı. Bulgular: Katılımcıların %49,5'i kadın ve yaş ortalaması 29,9±7,34 idi. Travma Sonrası Stres Bozukluğu (TSSB) yaygınlığı %59,8’dur. Çoklu regresyon analizi, toplam TSSB puanının yaklaşık %25'ini paramediklerin genel sağlık durumu ve sosyo-demografik özelliklerinin, %27'sini kriz yönetimi becerisi, uzun çalışma saatleri, ekipman eksikliği ve trafik yoğunluğunun, %40'ını ise travmatik yaşantılardan silah yaralanmalara, cinsel saldırıya, vahşice ölüme ve bir başkasının yaralanmasına/ ölümüne neden olan olaylara müdahale bağımsız olarak açıklamıştır (p<0.05). Sonuç: Bulgulara dayanarak paramediklerde TSSB'nin önlenmesi amacıyla; bireysel ve mesleki faktörlerin kontrolüne yönelik çalışan sağlığı ve güvenliği programlarına ruh sağlığı izleminin entegre edilmesinin, risk altındaki gruplara düzenli süpervizyon verilmesinin ve psiko-sosyal destek müdahalelerinin uygulanmasının, belirtilen girişimlerin afete hazırlık planlarına dahil edilmesinin yararlı olacağı düşünülmektedir.Istanbul Bilgi University, Istanbul Provincial Directorate of Healt