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      • KCI등재SCOPUS
      • KCI등재후보SCOPUS

        A further generalization of the Euler polynomials and on the 2D-Euler polynomials

        BURAK,KURT 장전수학회 2012 Proceedings of the Jangjeon mathematical society Vol.15 No.4

        In this work, we introduce and investigate a new general-ization of the Euler polynomials by means of a particular generating function. We consider 2D-Euler polynomials and we establish several interesting properties of these polynomials. We give four theorems. Fur-thermore, we prove multiplication formula for the 2D- Euler polynomi-als.

      • KCI등재후보SCOPUS

        Probabilistic ultimate strength analysis of submarine pressure hulls

        Burak,Can,Cerik,신현경,조상래 대한조선학회 2013 International Journal of Naval Architecture and Oc Vol.5 No.1

        This paper examines the application of structural reliability analysis to submarine pressure hulls to clarify the merits of probabilistic approach in respect thereof. Ultimate strength prediction methods which take the inelastic behavior of ring-stiffened cylindrical shells and hemi-spherical shells into account are reviewed. The modeling uncertainties in terms of bias and coefficient of variation for failure prediction methods in current design guidelines are defined by evaluating the compiled experimental data. A simple ultimate strength formulation for ring-stiffened cylinders taking into account the interaction between local and global failure modes and an ultimate strength formula for hemispherical shells which have better accuracy and reliability than current design codes are taken as basis for reliability analysis. The effects of randomness of geometrical and material properties on failure are assessed by a prelimnary study on reference models. By evaluation of sensitivity factors important variables are determined and comparesons are made with conclusions of previous reliability studies.

      • KCI등재SCIESCOPUS

        Effects of confinement reinforcement and concrete strength on nonlinear behaviour of RC buildings

        Burak,Yön,Yusuf,Calayır 사단법인 한국계산역학회 2014 Computers and Concrete, An International Journal Vol.14 No.3

        This paper investigates the effects of confinement reinforcement and concrete strength on nonlinear behaviour of reinforced concrete buildings (RC). For numerical application, an eleven-storey and four bays reinforced concrete frame building is selected. Nonlinear incremental static (pushover) analyses of the building are performed according to various concrete strengths and whether appropriate confinement reinforcement, which defined in Turkish seismic code, exists or not at structural elements. In nonlinear analysis, distributed plastic hinge model is used. As a result of analyses, capacity curves of the frame building and moment-rotation curves at lower end sections of ground floor columns are determined. These results are compared with each other according to concrete strength and whether appropriate confinement reinforcement exists or not, respectively. According to results, it is seen that confinement reinforcement is important factor for increasing of building capacity and decreasing of rotations at structural elements.

      • Structural reliability analysis of submarine ring-stiffened cylinders based on ultimate strength

        Burak,Can,Cerik,Su-Yong,Bae,Sang-Rai,Cho 대한조선학회 2012 대한조선학회 학술대회자료집 Vol.2012 No.5

        A reliability-based structural analysis for submarine pressure hull main component ring-stiffened cylinders is presented. The ultimate limit state of submarine pressure hull is associated with elasto-plastic collapse in various modes. The collapse prediction methods describing the inelastic behavior of ring-stiffened cylindrical shells are reviewed and modeling uncertainties are quantified with available test data compiled. The reliability analysis is performed for an example pressure hull model considering material and geometric uncertainties. It is shown that with probabilistic approach mode interaction and overdiving risks can be accounted contrary to deterministic approach in traditional design methodology. With a parametric study it is confirmed that the sensitivity of failure probability to modeling uncertainties is high. In order to validate the conclusions made for the reference model two experimental models are analyzed and a good agreement is found.

      • Structural reliability analysis of submarine ring-stiffened cylinders based on ultimate strength

        Burak,Can,Cerik,Su-Yong,Bae,Sang-Rai,Cho 한국해양환경·에너지학회 2012 한국해양환경공학회 학술대회논문집 Vol.2012 No.5

        A reliability-based structural analysis for submarine pressure hull main component ring-stiffened cylinders is presented. The ultimate limit state of submarine pressure hull is associated with elasto-plastic collapse in various modes. The collapse prediction methods describing the inelastic behavior of ring-stiffened cylindrical shells are reviewed and modeling uncertainties are quantified with available test data compiled. The reliability analysis is performed for an example pressure hull model considering material and geometric uncertainties. It is shown that with probabilistic approach mode interaction and overdiving risks can be accounted contrary to deterministic approach in traditional design methodology. With a parametric study it is confirmed that the sensitivity of failure probability to modeling uncertainties is high. In order to validate the conclusions made for the reference model two experimental models are analyzed and a good agreement is found.

      • SCIESCOPUSKCI등재

        Lesions in the thymus and bone marrow in chicks with experimentally induced chicken infectious anemia disease

        Burak,Kuscu.,Aydin,,mrel* 대한수의학회 2008 JOURNAL OF VETERINARY SCIENCE Vol.9 No.1

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

        One-day-old SPF chicks were inoculated with the Cux-l strain of chicken infectious anemia virus (CIAV), and the clinical development of disease and its macroscopic and microscopic alterations in the thymus and bone marrow, were observed. Tissue sections of thymus and bone marrow were stained using the streptavidin-biotin peroxidase method and examined under light microscope for evaluation of antigenic intensities in tissues. Those findings were then compared with blood parameters and ELISA results obtained through collected sera during sacrifice procedures. We sought to determine: the localization of viral antigens in thymus and bone marrow tissues after inoculation, the correlation between antigen intensities and hematologic, serologic and histopathologic findings, definitive diagnostic criteria using histopathologic and immunoperoxidase methods, and the reliability of these methods in the diagnosis of CIAV infection. For this purpose, 83, one-day-old SPF chicks were used. The birds were divided into experimental (n =52) and control (n = 26) groups. A virus dose of TCID50 of 100,000/ml was administered intramuscularly to every bird in the experimental group. Based on the results of this study, we have suggested that clinical examination, along with macroscopic and microscopic evaluation of the thymus and bone marrow, maybe undertaken starting from day 7 post-inoculation (PI). ELISA, might be of value, as it might give consistent results starting from day 14 PI. However, the most reliable results were obtained through examination of thymus and bone marrow sections from infected birds stained by immunoperoxidase technique, as early as day 4 PI.

      • KCI등재SCIESCOPUS

        Finite element study on composite slab-beam systems under various fire exposures

        Burak,K.,Cirpici,Suleyman,N.,Orhan,Turkay,Kotan 국제구조공학회 2020 Steel and Composite Structures, An International J Vol.37 No.5

        This paper presents an investigation of the thermal performance of composite floor slabs with profiled steel decking exposed to fire effects from floor. A detailed finite-element model has been developed by representing the concrete slab with steel decking under of it and steel beam both steel parts protected by intumescent coating. Although this type of floor systems offers a better fire resistance, passive fire protection materials should be applied when a higher fire resistance is desired. Moreover, fire exposed side is so crucial for composite slab systems as the total fire behaviour of the floor system changes dramatically. When the fire attack from steel parts, the temperature rises rapidly resulting in a sudden decrease on the strength of the beam and decking. Herein this paper, the fire attack side is assumed from the face of the concrete floor (top of the concrete assembly). Therefore, the heat is transferred through concrete to the steel decking and reaching finally to the steel beam both protected by intumescent coating. In this work, the numerical model has been established to predict the heat transfer performance including material properties such as thermal conductivity, specific heat and dry film thickness of intumescent coating. The developed numerical model has been divided into different layers to understand the sensitivity of steel temperature to the number of layers of intumescent coating. Results show that the protected composite floors offer a higher fire resistance as the temperature of the steel section remains below 60℃ even after 60-minute Standard (ISO) fire and Fast fire exposure. Obtaining lower temperatures in steel due to the great fire performance of the concrete itself results in lesser reductions of strength and stiffness hence, lesser deflections.

      • KCI등재

        All-arthroscopic, Guideless Single Suture-button Fixation of Acute Acromioclavicular Joint Dislocation

        Burak,Altintas,Fatih,Yildiz,Gokcer,Uzer,Mehmet,Kapicioglu,Kerem,Bilsel 대한견주관절의학회 2017 대한견주관절학회지 Vol.20 No.2

        Background: The purpose of this study was to examine the clinical and radiological results of the all-arthroscopic, suture-button fixation technique to treat acute acromioclavicular (AC) joint separations. Methods: All patients with acute AC joint separations received all-arthroscopic, single suture-button (TightRope) procedure without a special guide. Postoperative Constant score (CS), pain level according to visual analogue scale, and range of motion (ROM) were evaluated. For radiological evaluation, coracoclavicular distances were measured bilaterally. Results: Between December 2010 and June 2012, 18 consecutive patients (4 women and 14 men; mean age, 29.3 years) with acute AC joint separations underwent surgical treatment after 6.4 days (range, 2–20 days) following the initial trauma. The average postoperative follow-up was 16.9 months. The mean CS was 92.4 (range, 84–96). The mean external rotation, forward flexion, and abduction were 75.8° (range, 50°–90°), 170° (range, 150°–180°), and 163.8° (range, 140°–180°), respectively. Five patients exhibited coracoclavicular ossifications. In two patients, superficial wound infections were successfully treated with antibiotic therapy. In one patient, a coracoid fracture was observed. No significant differences were found regarding pain, ROM, or strength parameters between both sides. The coracoclavicular distance was discovered to be approximately 2.8 mm greater on the affected side; however, this minimal reduction loss did not affect the functional results. Conclusions: The findings of this study suggests that all-arthroscopic treatment of AC joint separations using the single suture-button technique without a drill guide is safe, yielding good to excellent clinical results.

      • KCI등재SCOPUS

        Lesions in the thymus and bone marrow in chicks with experimentally induced chicken infectious anemia disease

        Burak,Kuscu,Aydin,Gurel 대한수의학회 2008 JOURNAL OF VETERINARY SCIENCE Vol.9 No.1

        One-day-old SPF chicks were inoculated with the Cux-l strain of chicken infectious anemia virus (CIAV), and the clinical development of disease and its macroscopic and microscopic alterations in the thymus and bone marrow, were observed. Tissue sections of thymus and bone marrow were stained using the streptavidin-biotin peroxidase method and examined under light microscope for evaluation of antigenic intensities in tissues. Those findings were then compared with blood parameters and ELISA results obtained through collected sera during sacrifice procedures. We sought to determine: the localization of viral antigens in thymus and bone marrow tissues after inoculation, the correlation between antigen intensities and hematologic, serologic and histopathologic findings, definitive diagnostic criteria using histopathologic and immunoperoxidase methods, and the reliability of these methods in the diagnosis of CIAV infection. For this purpose, 83, one-day-old SPF chicks were used. The birds were divided into experimental (n = 52) and control (n = 26) groups. A virus dose of TCID50 of 100,000/ml was administered intramuscularly to every bird in the experimental group. Based on the results of this study, we have suggested that clinical examination, along with macroscopic and microscopic evaluation of the thymus and bone marrow, maybe undertaken starting from day 7 post-inoculation (PI). ELISA, might be of value, as it might give consistent results starting from day 14 PI. However, the most reliable results were obtained through examination of thymus and bone marrow sections from infected birds stained by immunoperoxidase technique, as early as day 4 PI. One-day-old SPF chicks were inoculated with the Cux-l strain of chicken infectious anemia virus (CIAV), and the clinical development of disease and its macroscopic and microscopic alterations in the thymus and bone marrow, were observed. Tissue sections of thymus and bone marrow were stained using the streptavidin-biotin peroxidase method and examined under light microscope for evaluation of antigenic intensities in tissues. Those findings were then compared with blood parameters and ELISA results obtained through collected sera during sacrifice procedures. We sought to determine: the localization of viral antigens in thymus and bone marrow tissues after inoculation, the correlation between antigen intensities and hematologic, serologic and histopathologic findings, definitive diagnostic criteria using histopathologic and immunoperoxidase methods, and the reliability of these methods in the diagnosis of CIAV infection. For this purpose, 83, one-day-old SPF chicks were used. The birds were divided into experimental (n = 52) and control (n = 26) groups. A virus dose of TCID50 of 100,000/ml was administered intramuscularly to every bird in the experimental group. Based on the results of this study, we have suggested that clinical examination, along with macroscopic and microscopic evaluation of the thymus and bone marrow, maybe undertaken starting from day 7 post-inoculation (PI). ELISA, might be of value, as it might give consistent results starting from day 14 PI. However, the most reliable results were obtained through examination of thymus and bone marrow sections from infected birds stained by immunoperoxidase technique, as early as day 4 PI.

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