Sürdürülebilir Kalkınma Amaçları
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- MakaleAçık Erişim2026Scopus SJRQ3In-depth Analysis of the Control Unit for Multiple Voltage Rails to Drive a Variety of ICs
Yanarateş, Cağfer; Altan, Aytaç
Generating a negative output voltage rail from a positive input voltage is possible by reconfiguring an ordinary buck regulator into an inverting buck-boost (IBB) topology. Rather than operating considerations such as voltage and current stresses, the main challenge associated with this transformation arises from differences in the small-signal closed-loop characteristics. The most critical distinction is the presence of a right-half-plane (RHP) zero in the control-to-output transfer function of the IBB, which introduces non-minimum-phase behaviour, reduces the achievable phase margin, and may lead to instability and poor load transient response. For conventional PI controllers, the buck and IBB converters resulted in settling times of 5.0 ms and 6.8 ms, with overshoots of 13.65% and 8.46%, respectively, thus demonstrating the performance limitations of fixed-gain designs. As a solution, an auto-tuned PI controller with adaptive features has been proposed, which operates effectively in both the buck and IBB topologies. The proposed scheme achieves a significantly faster settling time of 2.27 ms with overshoot and undershoot below 2%, thereby ensuring superior robustness and dynamic performance compared to conventional approaches.
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İncele - Yüksek Lisans TeziAçık Erişim2025Sağlık yönetimi öğrencilerinin etik değerler ile öz disiplin algıları arasındaki ilişkilerinin incelenmesi: Gümüşhane Üniversitesi örneği
İsmail Gül
Sağlık yönetimi öğrencileri sağlık kurumlarının yönetimi ve planlamasında gerekli bilgi ve becerileri edinerek mesleki yeterlilik kazanmayı hedefleyen bir eğitim sürecinden geçerler. Bu süreç çalışma koşullarına uyum sağlama, disiplinli çalışma ve öz disiplin geliştirme gibi önemli becerilerin gözlendiği bir dönemdir. Öz disiplin öğrencilerin görevlerini etkili ve zamanında yapmalarını sağlar ve bu becerilerin mesleki yaşamlarına olumlu yansımasına katkıda bulunur. Etik değerler ise öğrencilerin doğru ile yanlış arasında seçim yapmalarını, toplumsal kurallara saygı göstermelerini ve bu değerlerin eğitim yaşamlarını nasıl etkilediğini anlamalarını sağlar. Bu çalışmanın amacı Gümüşhane Üniversitesi sağlık yönetimi öğrencilerinin etik değerler ile öz disiplin algıları arasındaki ilişkiyi incelemektir. Çalışmada sağlık yönetimi öğrencilerinin etik değerler ile öz disiplin algıları arasındaki karşılıklı ilişkiler nicel araştırma yöntemleri ile analiz edilecektir. Katılımcılar anketler yoluyla etik değerler ve öz disiplin algılarına ilişkin veri sağlayacak ve bu veriler istatistiksel yöntemler kullanılarak analiz edilecektir. Çalışmanın bulguları sağlık yönetimi öğrencilerinin etik değerler ile öz disiplin algıları arasında anlamlı bir ilişki olup olmadığını ve bu iki kavramın birbirini nasıl etkilediğini ortaya koymayı amaçlamaktadır. Ayrıca bu bulgular sağlık yönetimi eğitim programlarının iyileştirilmesine katkıda bulunmayı ve öğrencilerin etik değer ve öz disiplin düzeylerinin artırılmasına yönelik somut öneriler sunmayı amaçlamaktadır. Çalışmanın analizinde T-testi, ANOVA ve korelasyon analizi yöntemleri kullanılacaktır. Araştırma sonuçlarının öz disiplin ile etik değerler arasında anlamlı bir ilişki ortaya koyması beklenmektedir. Bu çalışma etik değerler ile öz disiplinin bağımsız faktörler olarak değerlendirilemeyeceğini, aksine birbirini tamamlayan ve güçlendiren iki kavram olarak ele alınabileceğini göstermektedi
- MakaleAçık Erişim2024Scopus SJRQ1Enhanced Hysteresis Droop Control for Equivalent Load Sharing in Parallel PWM DC-DC Converters: Optimized Slew Rate by Resonant Filtering
Yanarates, Cagfer; Altan, Aytac
In this study, enhanced hysteresis droop control for equivalent and fast load sharing in parallel PWM DC-DC converters is presented. The basis behind the work encompasses power system stability, reliability, efficiency, reduction of losses and decrease in the operational cost. In this context, phase management, which constitutes the biggest problem, and the resulting factors such as ripple cancellation, thermal stress, transient response behavior and complexity, is aimed to manage with the proposed control scheme. Performance evaluation of the proposed system is based on sensitivity analysis against possible disturbance and noise, and comparative analysis with PI controller against uncertainty and parameter variations using mathematical modeling and simulation techniques. The results show that the proposed controller has improved performance in both noise attenuation and disturbance rejection at typical switching frequencies of DC-DC converters ranging from 100 kHz to a few MHz. Additionally, applying the proposed control technique considering 10% parameter variations led to the largest difference being recorded at 4% while this difference was 18.68% in conventional PI control. According to the findings of the simulation, the proposed control scheme reduces the settling time by a factor of 4.89, whereas it takes 775.862 μs seconds with the PI controller. Furthermore, with the suggested controller, the overshoot - which was 36.09% with the PI controller - is reduced to just 1%.
AtıfScopus7WoS6OpenAlex4İncele - MakaleAçık Erişim2023Scopus SJRQ3Exploring managerial insights through multi criteria decision making techniques in pharmacy inventory classification problem
Şimşek, Ahmet Bahadır; Göktekin, Zekiye; Geliç, Büşra
The current research addresses the inventory classification problem of community pharmacies, which have a dual role as both a vital component of the pharmaceutical supply chain and a typical retail store. Despite the existing literature indicating that pharmacists may lack knowledge on inventory management, it seems that the MCIC literature is weak in explaining how pharmacists can benefit from MCDA techniques in all aspects. To bridge this gap, the study aims to demonstrate that pharmacists can utilize MCDA techniques to gain deeper insights beyond mere classification in the context of inventory management. Real-world data from a community pharmacy in Turkey was classified using the EDAS method. Sensitivity analysis was performed for MCDA inputs, about which pharmacists may lack information. Scenario findings based on criterion weights and threshold values offer important managerial implications for pharmacists. This study provides a critical contribution to the literature on inventory management in community pharmacies by highlighting the potential of MCDA techniques to support decision-making beyond mere classification. The sensitivity analysis also sheds light on areas where pharmacists may lack knowledge and suggests ways to address these gaps. Overall, the study underscores the need for pharmacists to have a deeper understanding of inventory management and highlights the potential benefits of MCDA techniques in addressing this challenge.
AtıfScopus4WoS1OpenAlex6İncele - MakaleYalnız künye2010Scopus SJRQ3Optimum design of planar beams based on sensitivity analysis
Uysal, H.; Asci Demiröz, N.; Uzman, U.
In this study, the size optimization problem of a beam, in which the beam heights are determined along the beam axis, is considered as a shape optimization problem of a plate in plane elasticity. To achieve the shape optimization, different principles such as structural analysis, sensitivity analysis and mathematical programming are interrelated. The ANSYS that is a reliable finite element package programme is used only for the static analysis. The objective of this optimization problem is to minimize the volume of the beam under the constraints that the maximum value of the von Mises stress in each node do not exceed a predefined value and the beam axis is to remain straight. Design variables are the vertical coordinates of the corner nodal points of design elements. The design sensitivities are calculated through the finite, difference method and linear programming technique is used for obtaining the final shape of a beam. Several examples are solved under different loadings and boundary conditions. The obtained optimum beam volumes and the design variables are given in tables and the optimum beam shapes are plotted. One of the results given is compared with the literature.
- MakaleYalnız künye2007Scopus SJRQ1Optimum shape design of shell structures
Uysal, Habib; Gul, Rustem; Uzman, Umit
A finite element-based shape optimization program has been developed for three-dimensional shell structures and the shape optimization of shell structures has been performed. The shape optimization program is implemented by a job control language and a reliable finite element package program, ANSYS, is used for structural analysis. To achieve the shape optimization, different principles such as structural analysis, automatic mesh generation, sensitivity analysis and mathematical programming are inter-related. The objective is to minimize the weight of the shell structure under constraints that are the maximum value of the von Mises stress in each element and the move limit for each design variable. The design sensitivities are calculated using the finite difference method. The search for the final shape of a structure is performed using the linear programming technique. Several examples are provided.
AtıfScopus33WoS29OpenAlex36İncele