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        Structural repairing of damaged reinforced concrete beam-column assemblies with CFRPs

        Yurdakul,,Ozgur,Avsar,,Ozgur 국제구조공학회 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.54 No.3

        Depending on the damage type as well as the level of damage observed after the earthquake, certain measures should be taken for the damaged buildings. In this study, structural repairing of two different types of damaged RC beam-column assembly by carbon fiber-reinforced polymer sheets is investigated in detail as a member repairing technique. Two types of 1:1 scale test specimens, which represent the exterior RC beam-column connection taken from inflection points of the frame, are utilized. The first specimen is designed according to the current Turkish Earthquake Code, whereas the second one represents a deficient RC beam-column assembly. Both of the specimens were subjected to cyclic quasistatic loading in the laboratory and different levels of structural damage were observed. The first specimen displayed a ductile response with the damage concentrated in the beam. However, in the second specimen, the beam-column joint was severely damaged while the rest of the members did not attain their capacities. Depending on the damage type of the specimens, the damaged members were repaired by CFRP wrapping with different configurations. After testing the repaired specimens, it is found that former capacities of the damaged members were mostly recovered by the application of CFRPs on the damaged members.

      • KCI등재

        Does skip metastasis or other lymph node parameters have additional effects on survival of patients undergoing radical cystectomy for bladder cancer?

        Ozgur,Ugurlu,Sumer,Baltaci,Guven,Aslan,Cavit,Can,Cag,Cal,Atilla,Elhan,Levent,Turkeri,Aydin,Mungan 대한비뇨의학회 2015 Investigative and Clinical Urology Vol.56 No.5

        Purpose: To investigate the effects of lymph node metastasis, skip metastasis, and other factors related to lymph node status on survival in patients who underwent radical cystectomy (RC) and extended lymph node dissection (eLND). Materials and Methods: RC and eLND were performed in 85 patients with a diagnosis of bladder cancer. Disease-free survival (DFS) and overall survival (OS) were determined by using a Cox proportional hazards model that included the number of excised lymph nodes, the presence of pathological lymph node metastasis, the anatomical level of positive nodes, the number of positive lymph nodes, lymph node density, and the presence of skip metastasis. Results: The mean number of lymph nodes removed per patient was 29.4±9.3. Lymph node positivity was detected in 85 patients (34.1%). The mean follow-up duration was 44.9±27.4 months (2–93 months). Five-year estimated OS and DFS for the 85 patients were 62.6% and 57%, respectively. Three of 29 lymph node-positive patients (10.3%) had skip metastasis. Only lymph node positivity had a significant effect on 5-year OS and DFS (p<0.001). No difference in OS and DFS was found between the three patients with skip metastasis and other lymph node-positive patients. Other factors related to lymph node status had no significant effect on 5-year OS and DFS. Conclusions: No factors related to lymph node status predict DFS and OS, except for lymph node positivity. OS and DFS were comparable between patients with skip metastasis and other lymph node-positive patients.

      • SCOPUSKCI등재

        On Semiparallel and Weyl-semiparallel Hypersurfaces of Kaehler Manifolds

        Ozgur,,Cihan,Murathan,,Cengizhan,Arslan,,Kadri Department of Mathematics 2009 Kyungpook mathematical journal Vol.49 No.1

        We study on semiparallel and Weyl semiparallel Sasakian hypersurfaces of Kaehler manifolds. We prove that a (2n + 1)-dimensional Sasakian hypersurface M of a (2n+2)-dimensional Kaehler manifold $\widetilde{M}^{2n+2}$ is semiparallel if and only if it is totally umbilical with unit mean curvature, if dimM = 3 and $\widetilde{M}^4$ is a Calabi-Yau manifold, then $\widetilde{M}$ is flat at each point of M. We also prove that such a hypersurface M is Weyl-semiparallel if and only if it is either an ${\eta}$-Einstein manifold or semiparallel. We also investigate the extended classes of semiparallel and Weyl semiparallel Sasakian hypersurfaces of Kaehler manifolds.

      • KCI등재SCOPUS

        Harmony Search Algorithm for Continuous Network Design Problem with Link Capacity Expansions

        Ozgur,Baskan 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.1

        The Continuous Network Design Problem (CNDP) deals with determining the set of link capacity expansions and the corresponding equilibrium link flows which minimizes the system performance index defined as the sum of total travel times and investment costs of link capacity expansions. In general, the CNDP is characterized by a bilevel programming model, in which the upper level problem is generally to minimize the total system cost under limited expenditure, while at the lower level problem, the User Equilibrium (UE)link flows are determined by Wardrop's first principle. It is well known that bilevel model is nonconvex and algorithms for finding global or near global optimum solutions are preferable to be used in solving it. Furthermore, the computation time is tremendous for solving the CNDP because the algorithms implemented on real sized networks require solving traffic assignment model many times. Therefore, an efficient algorithm, which is capable of finding the global or near global optimum solution of the CNDP with less number of traffic assignments, is still needed. In this study, the Harmony Search (HS) algorithm is used to solve the upper level objective function and numerical calculations are performed on eighteen link and Sioux Falls networks. The lower level problem is formulated as user equilibrium traffic assignment model and Frank-Wolfe method is used to solve it. It has been observed that the HS algorithm is more effective than many other compared algorithms on both example networks to solve the CNDP in terms of the objective function value and UE traffic assignment number.

      • KCI등재SCOPUS

        Chemical composition and anti-biofilm activity of Thymus sipyleus BOISS. subsp. sipyleus BOISS. var. davisianus RONNIGER essential oil

        Ozgur,Ceylan,Aysel,Ugur 대한약학회 2015 Archives of Pharmacal Research Vol.38 No.6

        In this study, antimicrobial and antibiofilmactivities and the chemical composition of Thymus sipyleusBOISS. subsp. sipyleus BOISS. var. davisianus RONNIGERessential oil was evaluated. The essential oil wasobtained by hydro-distillation and analyzed by gas chromatography-mass spectrometry. Fourteen compounds werecharacterized, having as major components thymol(38.31 %) and carvacrol (37.95 %). Minimum inhibitoryconcentrations (MICs) of oil and the major componentswere calculated by serial dilution method, and anti-biofilmeffects by microplate biofilm assay against five Grampositive (Staphylococcus aureus MU 38, MU 40, MU 46,MU 47, Stahylococcus epidermidis MU 30) and five Gramnegative (Pseudomonas aeruginosa MU 187, MU 188, MU189, Pseudomonas fluorescens MU 180, MU 181) bacteria. It was found that MICs for essential oil, thymol and carvacrolwere between 5 and 50 ll/ml, 0.125–0.5 lg/ml and0.125–05 ll/ml, respectively. The results showed thatdoses of MIC produced a greater anti-biofilm influencethan 0.5, 0.25 and 0.125 MIC. In the presence of essentialoil (MIC), the mean biofilm formation value was equal to67 ± 5.5 % for P. aeruginosa MU 188, and essential oil(MIC) inhibition exceeds 60 % for P. aeruginosa biofilms. The results also showed that carvacrol (MIC) was able toinduce an inhibition 72.9 ± 4.1 % for S.aureus (MU 40)biofilm. In addition, thymol (MIC) showed 68.6 ± 5.3 %reduction in biofilm formation of P. fluorescens MU 181. This study demonstrated the antimicrobial and antibiofilmactivity of T. sipyleus BOISS. subsp. sipyleus BOISS. var. davisianus RONNIGER essential oil and points out theexceptional efficiency of thymol and carvacrol, whichcould represent candidates in the treatment of Pseudomonasand Staphylococcus biofilms.

      • SCIEKCI등재

        Imipenem - Cilastatin versus Sulbactam - Cefoperazone plus Amikacin in the Initial Treatment of Febrile Neutropenic Cancer Patients

        Ozgur,Ozyilkan,Ulku,Yalcintas,Sezgin,Baskan 대한내과학회 1999 The Korean Journal of Internal Medicine Vol.14 No.2

        The treatment of infectious complications in cancer patients has evolved as a consequence of the developments in the chemotherapy of cancer patients. In this prospective, randomized study, we compared imipenem-cilastatin and sulbactam- cefoperazone with am

      • KCI등재

        Political Islamist Movements in the Turkish Political History and the Position of AKP in Today`s Political Islamism

        ( Ozgur Sari ) 한국외국어대학교 중동연구소 2007 중동연구 Vol.25 No.2

        The political Islam and islamist movements have being existed in the Turkish political and social life until today. Those movements are, nowadays, the most hot and argumentative topics, since Justice and Development Party (AKP), that is called an islamist party by some scholars, has taken the power in the Turkish political life. It is, at the same time, the first time that a political party called as an islamist party is in power. Islam is not a pure religion, but it is, at the same time, a life style and political ideology that dominate Turkish political history. To understand the position of AKP in those movements, the historical processes of those heterogeneous movements in the late Ottoman and Turkish history must be understood.

      • KCI등재

        The Central Dislocation of Femoral Head in the Transverse and Both Column Acetabular Fractures: Is It Really Medialized?

        ( Ozgur Selek ), ( Ahmet Y. Sarlak ) 대한고관절학회 2017 Hip and Pelvis Vol.29 No.3

        Purpose: We hypothesized that the central dislocation of the femoral head does generally not occur in transverse acetabular fractures, although it does usually occur in both column fractures. Material and Methods: Fifty-two transverse and both column acetabular fracture cases were evaluated retrospectively. The distances between (a) the sciatic notch on the fracture side and the vertical axis of the pelvis (VA line) and (b) the contralateral intact sciatic notch and the VA line were measured. The a/b ratio corresponded to the superior iliac segment displacement or rotation. The ratio of the distance between the fracture side femoral head and the VA line (c) and the distance between the contralateral intact femoral head and the VA line (d) corresponded to the femoral head displacement. The width of ischium (e) on fractured side and (f) contralateral side were measured. The e/f ratio increment reflected ischiadic fragment mobility. Results: The median value of femoral head displacement (c/d) of the transverse fracture group (n=25) was 1.02 (1.000-1.07). Ischiadic fragment rotation (e/f ratio) of the transverse fracture group was 1.000. The median value of femoral head displacement (c/d) of the both column fractures (n=27) was 0.78 (0.64-0.85). Ischiadic fragment rotation (e/f ratio) of the both-column group was 1.15 (1.06-1.23). The differences between groups according to measurements were statistically significant. Conclusion: In contrary to Letournel description, our findings showed no medialization of femoral head in transverse acetabular fractures in general. This might be an illusion resulting from external rotation of the superior iliac segment.

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