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- 저자 : Fevzi (검색결과 25 건)
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Fevzi Bedir 대한기계학회 2006 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.20 No.7
In this study, we describe the conventional hot pressing (CHP) of layered Al-B₄C composites and their characterization. The matrix alloy Al-5 wt.%Cu was prepared from elemental powder mixtures. The metal and B₄C powders were mixed to produce either Al-Cu-10vol.%B₄C or Al-Cu-30vol.%B₄C combinations. Then, these powder mixtures were stacked as layers in the hot pressing die to form a two-layered composite. Hot pressing was carried out under nitrogen atmosphere to produce 30 × 40 × 5 ㎜ specimens. Microstructural features and age hardening characteristics of composites were determined by specimens cut longitudinally. The flexural strength of both layered composites and their monolithic counterparts were investigated via three point bending tests. In the case of layered specimens of both 10vol.%B₄C and 30vol.%B₄C containing layers were loaded for three-point test. The results show that a homogeneous distribution of B₄C particles in the matrix alloy which is free of pores, can be obtained by CHP method. The ageing behavior of the composites was found to be influenced by the reinforced materials, i.e. higher hardness values were reached in 8 hrs for the composites than that for the matrix alloy. Flexural strength test showed that two-layered composites exhibited improved damage tolerance depending on layer arrangement. Microstructural investigation of the fracture surfaces of the bending specimens was performed by means of scanning electron microscope (SEM). While layer with lower reinforcement content exhibited large plastic deformation under loading, the other with higher reinforcement content exhibited less plastic deformation.
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Energy harvesting using an aerodynamic blade element at resonant frequency with air excitation
Fevzi C. Bolat,Selim Sivrioglu 국제구조공학회 2019 Smart Structures and Systems, An International Jou Vol.24 No.3
In this research, we propose an energy harvesting structure with a flexible blade element vibrating at its first mode to maximize the power output of the piezoelectric material. For this purpose, a piezoelectric patch was attached on the blade element used in a small-scale wind turbine, and air load was applied with a suitable angle of attack in the stall zone. The aerodynamic load created by air excitation vibrates the blade element in its first natural frequency and maximizes the voltage output of the piezoelectric patch. The variation of power outputs with respect to electrical resistance, air speed, and extra mass is experimentally investigated for various cases. An analytical model is constituted using a single-mode blade element with piezoelectric patch dynamics, and the power outputs of the obtained model are compared with experimental results.
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Kahveci Fevzi,Ocak Buse Önen,Gün Emrah,Gurbanov Anar,Uçmak Hacer,Aslan Ayşen Durak,Ceran Ayşegül,Özen Hasan,Balaban Burak,Botan Edin,Şıklar Zeynep,Berberoğlu Merih,Kendirli Tanıl 대한중환자의학회 2023 Acute and Critical Care Vol.38 No.3
Background: Diabetic ketoacidosis (DKA) is a common endocrine emergency in pediatric patients. Early presentation to health facilities, diagnosis, and good management in the pediatric intensive care unit (PICU) are crucial for better outcomes in children with DKA. Methods: This was a single-center, retrospective cohort study conducted between February 2015 and January 2022. Patients with DKA were divided into two groups according to pandemic status and diabetes diagnosis. Both groups were examined in two subcategories (pandemic status: pre-pandemic vs. pandemic; and diabetes diagnosis status: previously diagnosed vs. newly diagnosed).Results: The study enrolled 59 patients, and their mean age was 11±5 years. Forty (68%) had newly diagnosed type 1 diabetes mellitus (T1DM), and 61% received follow-up in the pre-pandemic period. Blood glucose, blood ketone, potassium, phosphorus, creatinine, and alanine transaminase levels were significantly higher in the new-onset T1DM group compared with the previously diagnosed group (P=0.01, P=0.02, P=0.01, P=0.039, and p=0.001, respectively). In patients with newly diagnosed T1DM, length of PICU stays were longer than in those with previously diagnosed T1DM (28.5±8.9 vs. 17.3±6.7 hours, p<0.005). The pandemic group was compared with pre-pandemic group, there was a statistically significant difference in laboratory parameters of pH, HCO3, and lactate and also Pediatric Risk Of Mortality (PRISM) III score. All patients survived, and there were no neurologic sequelae. Conclusion: Patients admitted during the pandemic period were admitted with more severe DKA and had higher PRISM III scores. During the pandemic period, there was an increase in the incidence of DKA in the participating center compared to that before the pandemic. Although the reason for this is not fully known, it could be public health presentations were not effective during the coronavirus disease 2019 (COVID-19) period.
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Bedir Fevzi The Korean Society of Mechanical Engineers 2006 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.20 No.7
In this study, we describe the conventional hot pressing (CHP) of layered $Al-B_4C$ composites and their characterization. The matrix alloy Al-5 wt.%Cu was prepared from elemental powder mixtures. The metal and B4C powders were mixed to produce either $Al-Cu-10vol.%B_4C$ or $Al-Cu-30vol.%B_4C$ combinations. Then, these powder mixtures were stacked as layers in the hot pressing die to form a two-layered composite. Hot pressing was carried out under nitrogen atmosphere to produce $30\times40\times5mm$ specimens. Microstructural features and age hardening characteristics of composites were determined by specimens cut longitudinally. The flexural strength of both layered composites and their monolithic counterparts were investigated via three point bending tests. In the case of layered specimens of both $10vol.%B_4C$ and $30vol.%B_4C$ containing layers were loaded for three-point test. The results show that a homogeneous distribution of $B_4C$ particles in the matrix alloy which is free of pores, can be obtained by CHP method. The ageing behavior of the composites was found to be influenced by the reinforced materials, i.e. higher hardness values were reached in 8 hrs for the composites than that for the matrix alloy. Flexural strength test showed that two-layered composites exhibited improved damage tolerance depending on layer arrangement. Microstructural investigation of the fracture surfaces of the bending specimens was performed by means of scanning electron microscope (SEM). While layer with lower reinforcement content exhibited large plastic deformation under loading, the other with higher reinforcement content exhibited less plastic deformation.
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EXPLAINING ONLINE BRAND EQUITY WITH WEBSITE INTERACTIVITY THEORY: A STUDY OF CUSTOMER EQUITY
Albert A. Barreda,Fevzi Okumus,Khaldoon Nusair,Anil Bilgihan 글로벌지식마케팅경영학회 2016 Global Marketing Conference Vol.2016 No.7
The Internet is considered as a competitive marketing instrument in advancing business-related information and real-time transaction opportunities (Kumar, 2013). Several brand managers are questioning whether the existent marketing approaches to position their brands, with the purpose to operate in a traditional and online setting, may be enhanced (Liu, 2012). The Internet is recognized as an influential instrument that has changed the manner brands conduct business and the way consumers and businesses interact (Boyland et al., 2013). The distinctive value that the Internet offers over conventional media is the capacity to interact with consumers. This permits practitioners to adjust their presentation to adapt specific consumers’ needs. Contrary to other forms of media, the Internet assists companies to create long-term relationships with its consumers as it allows a distinctive reciprocal communication. This reciprocal communication that distinguishes the latest marketing channels from conventional media is website interactivity (Wang et al., 2013). a mechanized environment the same way as a company does in a traditional environment. It includes communicating with consumers directly, generating an exclusive and individual interaction with them. As a central aspect in technology-mediated communication, Website interactivity has been identified as a critical component to create strong brands (Voorveld et al., 2013). Regardless of the significance of Website interactivity, very limited research was identified in the branding and marketing literature that investigate the influential role of interactivity on brand equity. To this date very few researchers have devoted efforts to investigate the influential impact of Website interactivity on branding constructs. Therefore, this study closes this gap with the conceptualization and the impact of the two dimensions of Website interactivity namely social interactivity and system interactivity on brand equity. Additionally, another contribution is to examine the mediating effect of brand image and brand awareness in the formation of brand equity in the online environment. The study propose a theory-based model of Website interactivity as a precursor to build online brand equity and to examine the relationships among Website interactivity, bran image, brand awareness, and brand equity in the context of branded Websites. Leaning on the fundamentals of branding literature and the Website interactivity theory, a theoretical framework is designed and seven hypotheses are examined. A two-phase analysis is considered, first a Confirmatory factor analysis (CFA) and then a Structural Equation Modeling (SEM). The findings show that the dimensions of Website interactivity impact significantly on the brand awareness and brand image which in turn influence online brand equity. As today limited research has been focused on studying the impact of Website interactivity as a branding instrument. In this study, the authors consider Website interactivity to be the interaction between Websites and individuals. In this sense, Website interactivity is viewed as an essential high-tech capability for building brands (Voorveld et al., 2013) as it allows a reciprocal communication with the system and other users. Current literature indicates that for a more real illustration of the dual dimensions of Website interactivity, studies devote user control as an expression of system interactivity and two-way communication as an expression of social interactivity (Wang et al., 2013). Two-way communication (social interactivity) refers to reciprocal communication between individuals. The dimension is perceived as the interaction between the users and the system (e.g. Website) (e.g. through e-mail, chat or toll-free telephone access to customer service, etc.). The user control (system interactivity) perspective is more concerned with the ability of the user to select content and guide the interaction (Lowry et al., 2006). User control is manifested when individuals are granted the opportunity to select the content and influence the communication. For instance, Web users may feel themselves as possessing user control because they have the capacity to select without restrictions (through an internal search engine).
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Albert A. Barreda,Khaldoon Nusair,Fevzi Okumus,Anil Bilgihan 글로벌지식마케팅경영학회 2016 Global Marketing Conference Vol.2016 No.7
Trusting beliefs are playing an increasingly important role in building customer-based brand equity (CBBE) in the business arena. The present study examines the mediating effect of trusting beliefs on the interactivity-brand equity relationship. An online survey was administered to collect data from randomly selected consumers. The results show that system interactivity impact brand equity directly and indirectly through trust integrity. The present theory-driven model contributes to a better understanding of online brand equity. Therefore, allocating resources to influence the perception of system interactivity and trusting integrity beliefs is valuable to develop online brand equity. This research contributes to the interactivity theory and the relationship marketing theory and it also offers implications for practitioners.
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