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Search Results: 1 - 10 of 972 matches for " Fatih Koca "
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Fatih Ozdemir,Binnaz Koca
Idil Dergisi , 2013, DOI: 10.7816/idil-02-06-12
Abstract: The capitalism goes beyond/crosses all of the class differences and offers a common life style, a common culture, called popular culture with the aim of including the people from all the classes in the market he formed. Andy Warhol transformed the consumption goods that exist in bulks in the community into the art with his distinctive style with the pop art that emerged in the 1960s. Warhol considered the formation of standardized human model that resemble each other without pressure, force on the people constituting the consumption society and wanted to join this consumption society as the machine. Like a machine producing the consumption goods, a machine that is alike the others, that increases as it wishes, works continually and tirelessly... He would get superficial while conveying the facile ordinary subjects without adding his own personality and feeling. It is not necessary to think over the image. He reached the targeted mass production logic by using the screen printing technique and made the things he produced resemble the each other. His subjects were sometimes the canning soup and were sometimes the death paintings. In his paintings, like the consumption goods and ordinary objects, the violence and death turn into a casual object.
Neutrophil gelatinase-associated lipocalin levels in right and left heart failure: an observational study
Fatih Koca,?brahim Halil Tanbo?a,Mehmet Mustafa Can,Alper ?zkan
Anadolu Kardiyoloji Dergisi , 2011,
Abstract: Objective: Neutrophil gelatinase-associated lipocalin (NGAL) is a novel marker for early detection of renotubular deterioration. Despite the limited data concerning the NGAL in heart failure (HF), significance of NGAL in right-sided HF remains unknown. We assessed serum and urinary NGAL in left and right-sided HF due to non-ischemic cardiomyopathy (NICMP) and severe pulmonary arterial hypertension (PAH). Methods: In this cross-sectional observational study, we compared three groups; 35 patients with NICMP, 28 patients with PAH and 27 healthy controls. None had a serum creatinine ≥1.5 mg/dL. Plasma brain natriuretic peptide (BNP) levels, estimated glomerular filtration rate (eGFR) by Cockroft-Gault (CG) and Modification of Diet in Renal Disease Study formulas, echocardiographic measures of left and right ventricles (LV, RV) and non-invasive measurement of cardiac index (CI) by echocardiography and impedance cardiography were assessed. Differences among the groups for continuous variables were evaluated by the ANOVA and the Kruskal-Wallis test as appropriate. The Chi-square test was used for comparison of categorical variables.Results: Despite eGFR with CG formula was lower in NICMP and PAH subsets as compared to those in controls (102±27 and 99.4±29.4 vs 122.4±25.9 mL/min, p<0.05 and p<0.005 in order), serum NGAL [141 (113-151), 174 (130-192) and 132 (95-181) ng/mL] and urinary NGAL [15 (12-18), 15 (12-22) and 13 (8-18) ng/mL] levels were not different among groups (p=0.15 and p=0.35, respectively). Conclusion: Despite the mildly impaired eGFR in left-sided HF due to NICMP and right-sided HF due to PAH, neither serum, nor urinary NGAL levels are elevated in these patients.
Einstein Hermitian Metrics of Positive Sectional Curvature
Caner Koca
Mathematics , 2011,
Abstract: In this paper we will prove that the only compact 4-manifold M with an Einstein metric of positive sectional curvature which is also hermitian with respect to some complex structure on M, is the complex projective plane CP^2, with its Fubini-Study metric.
Extremal Kaehler Metrics and Bach-Merkulov Equations
Caner Koca
Mathematics , 2011,
Abstract: In this paper, we study a coupled system of equations on oriented compact 4-manifolds which we call the Bach-Merkulov equations. These equations can be thought of as the conformally invariant version of the classical Einstein-Maxwell equations in general relativity. Inspired by the work of C. LeBrun on Einstein-Maxwell equations on compact Kaehler surfaces, we give a variational characterization of solutions to Bach-Merkulov equations as critical points of the Weyl functional. We also show that extremal Kaehler metrics are solutions to these equations, although, contrary to the Einstein-Maxwell analogue, they are not necessarily minimizers of the Weyl functional. We illustrate this phenomenon by studying the Calabi action on Hirzebruch surfaces.
Radii of the E8 Gosset Circles as the Mass Excitations in the Ising Model
Mehmet Koca,Nazife Ozdes Koca
Physics , 2012,
Abstract: The Zamolodchikov's conjecture implying the exceptional Lie group E8 seems to be validated by an experiment on the quantum phase transitions of the 1D Ising model carried out by the Coldea et. al. The E8 model which follows from the affine Toda field theory predicts 8 bound states with the mass relations in the increasing order m1, m2= tau m1, m3, m4, m5, m6=tau m3, m7= tau m4, m8= tau m5, where tau= (1+\sqrt(5))/2 represents the golden ratio. Above relations follow from the fact that the Coxeter group W(H4) is a maximal subgroup of the Coxeter-Weyl group W(E8). These masses turn out to be proportional to the radii of the Gosset's circles on the Coxeter plane obtained by an orthogonal projection of the root system of E8 . We also note that the masses m1, m3, m4 and m5 correspond to the radii of the circles obtained by projecting the vertices of the 600-cell, a 4D polytope of the non-crystallographic Coxeter group W(H4). A special non-orthogonal projection of the simple roots on the Coxeter plane leads to exactly the numerical values of the masses of the bound states as 0.4745, 0.7678, 0.9438, 1.141, 1.403, 1.527, 1.846, and 2.270. We note the striking equality of the first two numerical values to the first two masses of the bound states determined by the Coldea et. al.
Current Approach to Treatment of Juvenile Idiopathic Arthritis: Case Report of Hiperimmunglobulin E Syndrome Developed Juvenile Idiopathic Arthritis  [PDF]
Tuba Tülay Koca, Ayd?n Arslan
Open Journal of Rheumatology and Autoimmune Diseases (OJRA) , 2015, DOI: 10.4236/ojra.2015.53011
Abstract: Introduction: Juvenile idiopathic arthritis (JIA) represents a heterogeneous group of childhood chronic arthritic conditions. The pathogenesis of JIA remains incompletely understood. This disease can lead to a significant morbidity including joint deformity, growth impairment and a persistence of active arthritis into adulthood. The past two decades have witnessed significant advances in treatment and improved outcomes for affected children. With the current use of biologics, more target-specific, better tolerated, safer and more effective treatments have become possible. However, continuing, comprehensive follow-up is needed to characterize the long-term effects of such treatments. Hyperimmunoglobulin E syndrome (hyper-IgE, or Job’s syndrome) is a rare immune deficiency characterized by high IgE levels, atopic chronic eczema, tendency towards re-current pyogenic infection, neutrophil chemotaxis disorder and varying T-cell function impairment. Case Report: The case of a 17-year-old male patient with hyper-IgE who develops the oligoarticular subtype of JIA over a period of four years is discussed. The course of JIA is unfavorable, causing severe deformity of numerous joints (left elbow, right 3rd metacarpophalangeal, left knee, right ankle) and a fungal infection scar on the left eye. Blood tests show an ESR of 89 mm/h, rheumatoid factor (RF) 8.3 IU/mL (0 - 20) and positive antinuclear antibody (ANA). To improve gait, corrective surgery is performed on the right ankle, followed by rehabilitation and physical therapy. Conclusion: Developments in the near future will be crucial for understanding JIA pathophysiology and improving treatment.
Stress Fracture of Bilateral Distal Tibia Provoked by Stair Climbing  [PDF]
Aydin Arslan, Ali Utkan, Tuba Tulay Koca
Case Reports in Clinical Medicine (CRCM) , 2015, DOI: 10.4236/crcm.2015.410067
Abstract: Background: Stress fractures are fatigue-induced, very small cracks in the bone caused by repetitive application of force and most often seen in the weight-bearing bones of the lower extremities of athletes or military recruits. Case Report: A 47-year-old postmenopausal and heavy smoker woman complained of localized sensitivity on the distal-anterior and medial surfaces of both tibiae, which had been ongoing for 1 month. She moved to a flat at 5th-floor without an elevator a year ago. Bilateral stress fractures were diagnosed by radiographs and confirmed by Magnetic Resonance Imaging (MRI). She was suggested to restrict activities and to use crutches until the symptoms subsided. Bilateral ankle joint pneumatic brace with full heel support was applied. The patient was followed one year after diagnosis. At the 2-month follow-up examination, the patient was pain free and planning to move to a new house. Conclusions: Several risk factors have been defined in the pathogenesis of stress fracture. In the present case, the acute phase had passed and diagnosis could be made from the direct radiographs. Although extremely rarely seen, tibia distal stress fracture should be kept in mind in the differential diagnosis of patients with the relevant risk factors who present with tibia distal localized pain.
Incidence and Risk Factors of the Secondary Skin Infections in Patients with Radiodermatitis
Ulku Altoparlak,Ozlem Koca,Timur Koca
Eurasian Journal of Medicine , 2011,
Abstract: Objective: The aim of this prospective study was to investigate the incidence and risk factors of secondary infected radiodermatitis in patients receiving radiotherapy and to determine isolated microorganisms’ resistance profiles to different antimicrobial agents.Materials and Methods: The study comprised 62 patients admitted to the Regional Training and Research Hospital from January 2009 to January 2010. Radiodermatitis was graded according to the National Cancer Institute’s Common Toxicity Criteria version 3.0. Potential risk factors for secondary infection were recorded and evaluated by univariate and multivariate analyses.Results: In 62 patients, grade 1, 2, 3 and 4 radiodermatitis were observed in 33 (53.2%), 11 (17.7%), 8 (12.9%) and 10 (16.2%) patients, respectively. Skin infection secondary to radiodermatitis occurred in 14 patients (infected patients), 21.4%, 21.4% and 57.2% of whom had grade 2, 3 and 4 radiodermatitis, respectively. Forty-eight patients were found to be colonized with micoorganisms (colonized patients). In the univariate analysis, concurrent endocrine therapy and radiodermatitis grade differed significantly between infected and colonized patients (p<0.05). Multivariate analyses showed that the radiodermatitis grade was an independent risk factor for the acquisition of infection (p<0.05). The microbial pathogens isolated from patients with skin infection were seven methicillin-resistant coagulase-negative Staphylococcus (MRCNS) strains, three methicillin-resistant Staphylococcus aureus (MRSA) strains, two Candida sp., one methicillin-sensitive coagulase-negative Staphylococcus (MSCNS) strain and one methicillin-sensitive S. aureus (MSSA) strain. Staphylococci strains were more resistant to beta-lactam antibiotics. No glycopeptide resistance was found.Conclusion: The results of this study indicate that high-grade radiodermatitis leads to an increased risk for secondary infection of the skin with pathogens.
Catalan Solids Derived From 3D-Root Systems and Quaternions
Mehmet Koca,Nazife Ozdes Koca,Ramazan Koc
Physics , 2009, DOI: 10.1063/1.3356985
Abstract: Catalan Solids are the duals of the Archimedean solids, vertices of which can be obtained from the Coxeter-Dynkin diagrams A3, B3 and H3 whose simple roots can be represented by quaternions. The respective Weyl groups W(A3), W(B3) and W(H3) acting on the highest weights generate the orbits corresponding to the solids possessing these symmetries. Vertices of the Platonic and Archimedean solids result as the orbits derived from fundamental weights. The Platonic solids are dual to each others however duals of the Archimedean solids are the Catalan solids whose vertices can be written as the union of the orbits, up to some scale factors, obtained by applying the above Weyl groups on the fundamental highest weights (100), (010), (001) for each diagram. The faces are represented by the orbits derived from the weights (010), (110), (101), (011) and (111) which correspond to the vertices of the Archimedean solids. Representations of the Weyl groups W(A3), W(B3) and W(H3) by the quaternions simplify the calculations with no reference to the computer calculations.
Group Theoretical Analysis of Quasicrystallography from Projections of Higher Dimensional Lattices Bn
Mehmet Koca,Nazife Ozdes Koca,Ramazan Koc
Physics , 2014,
Abstract: A group theoretical discussion on the hypercubic lattice described by the affine Coxeter-Weyl group Wa(Bn) has been presented. When the lattice is projected onto the Coxeter plane it is noted that the maximal dihedral subgroup Dh of W(Bn) with h = 2n representing the Coxeter number describes the h-fold symmetric quasicrystallography. Higher dimensional cubic lattices are explicitly constructed for n = 4, 5, 6. Their rank 3 Coxeter subgroups and maximal dihedral subgroups are identified. It has been explicitly shown that when their Voronoi cells are decomposed under the respective rank 3 subgroups W(A3),W(H2) x W(A1) and W(H3) one obtains the rhombic dodecahedron, rhombic icosahedron and rhombic triacontahedron respectively. Projection of the lattice B4 onto the Coxeter plane represents quasicrystal structures with 8-fold symmetry. The B5 lattice is used to describe the quasicrystals with both 5-fold and 10-fold symmetries. The lattice B6 can describe a 12-fold symmetric quasicrystal as well as a 3D icosahedral quasicrystal depending on the choice of subspace of projections. The novel structures from the projected sets of lattice points are compatible with the available experimental data.
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