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    Article
    Citation - WoS: 2
    Citation - Scopus: 2
    Performance of Ge-Sandwiched Gase Layers
    (Springer, 2018) Qasrawi, A. F.; Qasrawı, Atef Fayez Hasan; Abdallah, Maisam M. A.; Qasrawı, Atef Fayez Hasan; Department of Electrical & Electronics Engineering; Department of Electrical & Electronics Engineering
    In the current work, we report the effect of sandwiching Ge between two stacked layers of GaSe. The GaSe and Ge-sandwiched GaSe were subjected to x-ray diffraction, optical spectrophotometry and impedance spectroscopy measurement and analysis. The presence of a Ge layer between two layers of GaSe was observed to cause uniform deformation and increase the absorption of light by GaSe. The response of the dielectric constant to incident light was also significantly enhanced by Ge sandwiching. In addition, Drude-Lorentz modeling of the imaginary part of the dielectric constant revealed that the layer of Ge layer between GaSe layers increased the drift mobility from 30.76 cm(2)/Vs to 52.49 cm(2)/Vs. It also enhanced the plasmon frequency without altering the free carrier density. Moreover, Ge improved the band filtering features of GaSe. In particular, it enhanced the sensitivity of the impedance response to the incident signal and increased the return loss factor of GaSe when it was used as a high band pass filter.
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    Researcher
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    Researcher
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    Researcher
    Kania, Gül
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    Article
    Citation - WoS: 2
    Citation - Scopus: 4
    State-Based Conceptual Design in Mechatronics Via Petri Nets: a Case Study for an Educational Robot
    (Romanian Soc Control Tech informatics, 2011) Erden, Zuhal; Mechatronics Engineering
    Use of state-based models to represent artifact behaviors at conceptual design is a challenging area for design research. Conceptual design of mechatronic systems needs a multi-domain approach in which the "logical behavior" of a mechatronic design artifact is described without any physical realization. This paper presents a case study on state-based representation for the intended behavior of a non-existent robot at early conceptual level. The behavior is defined through a demonstrative scenario and represented as states and state transitions independent of any physical embodiment. Discrete Event System Specification (DEVS) and Petri Net formalism are used for the model. This representational model is first step towards the development of a virtual prototype for the logical behavior of robot design.
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    Master Thesis
    Karmaşık Sistemler için Veritabanı Tasarım Yöntemi
    (2013) Topallı, Damla; Çağıltay, Nergiz Ercil
    Yazılımın kalitesi, kullanıcıların ihtiyaçlarını ve memnuniyetlerini sağlamakla doğrudan ilgilidir. Kullanıcı gereksinimlerini yazılım süreçlerine yansıtmak için, veritabanı modelinin doğru tasarlanması, yazılım geliştirme sürecinde kritik bir aşamayı oluşturur. Veritabanı tasarımı, kullanıcıların veriler ile ilgili tüm gereksinimleri modellemeleri için önemli bir araçtır. Veritabanı tasarımındaki olası hatalı durumlar, tüm yazılım geliştirme süreçlerine yansımaktadır. Olası hatalı durumlar aynı zamanda yazılımda ve amaçlanan sistemin işlevselliğinde sürekli değişimlere de sebep olabilmektedir. Bu durum kullanıcıların memnuniyetsizliğiyle sonuçlanabilir. Bu bağlamda, kullanıcı gereksinimlerini veritabanı modelinde tam olarak yansıtmak ve veritabanının yazılım geliştirme sürecinde yer alan herkes tarafından doğru anlaşılması, yazılım sistemleri geliştirmedeki başarıyı doğrudan etkileyen bir faktördür. Bu çalışmada, karmaşıklık derecesini azaltarak veritabanı modellerinin anlaşılabilirliğini artırmak ve yazılım kalitesini yükseltmek amacıyla iki aşamalı bir kavramsal veri modelleme yöntemi önerilmektedir. Bu çalışmanın başında önerilen iki aşamalı kavramsal veri modelleme anlatılmaktadır. Sonrasında deneysel çalışmalar ve formüller yoluyla, önerilen yöntemin yazılım mühendislerinin kavrayışı üzerindeki etkisi incelenmekte ve sonuçlar değerlendirilmektedir. Bu çalışmanın sonucunda, önerilen iki aşamalı kavramsal modelleme yönteminin yazılım mühendislerinin kavrayışını kolaylaştırdığı ve bu aşamadaki olası hataları önleyebileceği görülmektedir.
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    Article
    Citation - WoS: 27
    Citation - Scopus: 28
    Polycrystalline Diamond End Mill Cutting Edge Design To Improve Ductile-Mode Machining of Silicon
    (Elsevier Science inc, 2018) Oliaei, S. N. B.; Karpat, Y.
    Silicon is a commonly used material in optoelectronics and micro fluidics devices. Micro mechanical milling of silicon with polycrystalline diamond (PCD) tools has the potential to produce three-dimensional surfaces with good surface finish and an increased material removal rate. PCD micro end mill geometry is known to influence process outputs yet its effect has not been studied in detail. In this study, a PCD end mill with a hexagonal geometry has been considered, and its micro cutting geometry has been modified to have a parallelogram shape featuring a large negative rake angle on the bottom of the tool. The proposed micro geometry also reduces the contact area between the tool and the work material. The proposed geometry was fabricated using wire electric discharge machining (WEDM). Ductile-to-brittle transition conditions and areal surface roughness have been investigated as a function of tool geometry and feed during micro milling of silicon. A significant improvement in material removal rate and surface roughness has been obtained compared to a commercially available PCD end mill having hexagonal geometry with flat bottom. The results show that PCD micro end mill geometry significantly affects the process outputs.
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    Article
    An Investigation Into The AI-Assisted Visualization Of Children’s Songs: The Case Of Ali Baba’s Farm
    (Nilgun SAZAK, 2025) Südor, S.; İpekçiler, B.
    This study aims to visualize children’s songs, which are part of primary-level music education, using AI-supported tools. The objectives of the Ministry of National Education’s music course curriculum were examined, and both the themes to be emphasized in song selection and the pedagogical functions of children’s songs were analyzed. In the literature review, the Web of Science and Google Scholar databases were used. The obtained source data were analyzed with the VOSviewer software to generate conceptual maps, through which thematic trends in the field were identified. In the practical part of the study, the children’s song “Old MacDonald’s Farm” was visualized in detail using two different AI-supported tools: RunwayML and WZRD.ai. In RunwayML, prompt-based scenes were generated using the “text-to-video” feature, and visuals compatible with the lyrics of the song were created. On the WZRD.ai platform, visuals were automatically generated in response to sound waves, and the limitations of the platform were examined. Based on the findings, it was concluded that RunwayML offers more effective results for pedagogical content production, while WZRD. ai, despite its technical capabilities, falls short in delivering child-appropriate visual stimuli. The study also provides a theoretical foundation on synesthesia and discusses how AI tools can be integrated into music education in early childhood and primary school levels. The findings indicate that AI-supported visualization tools have the potential to provide engaging and flexible educational materials that support learning at the primary school level. It is recommended that teacher training programs develop hands-on modules for these tools, and that future research focus on how these technologies can be adapted to various songs, age groups, and learning domains. © © 2025 The Author(s). This is an open access article distributed under the Creative Commons Attribution License (CC BY), which permits unrestricted use, distribution, and reproduction in any medium or format, provided the original work is properly cited.
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    Article
    Dance of the Corporate Veils: Shareholder Liability in the United States of America and in the Republic of Turkey
    (2008) Davıs, B. E. Wendy; Hızır, Serdar
    The foundation of corporate law is the existence of a legal entity separate from its shareholders, thus shielding shareholders from liability for corporate obligations. Courts have rarely, and with trepidation, pierced through this corporate veil to impose liability on shareholders for corporate malfeasance. These instances have become more common in recent decades, suggesting that corporate investors and parent corporations acquiring subsidiaries need to be diligent to minimize their risk. In this article two academicians discuss the consequences of wrongdoing and mismanagement underlying the pros and cons of the systems adapted by both countries.
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    Researcher