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Ozbay, Pelin Ozun,Ekinci, Tekin,Caltekin, Melike Demir,Yilmaz, Hasan Taylan,Temur, Muzaffer,Yilmaz, Ozgur,Uysal, Selda,Demirel, Emine,Kelekci, Sefa Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.1
Background: To determine the cut-off values of the preoperative risk of malignancy index (RMI) used in differentiating benign or malignant adnexal masses and to determine their significance in differential diagnosis by comparison of different systems. Materials and Methods: 191 operated women were assessed retrospectively. RMI of 1, 2, 3 and 4; cut-off values for an effective benign or malignant differentiation together with sensitivity, specificity, negative and positive predictive values were calculated. Results: Cut-off value for RMI 1 was found to be 250; there was significant (p<0.001) compatibility at this level with sensitivity of 60%, positive predictive value (PPV) of 75%, specificity of 93%, negative predictive value (NPV) of 88% and an overall compliance rate of 85%. When RMI 2 and 3 was obtained with a cut-off value of 200, there was significant (p<0.001) compatibility at this level for RMI 2 with sensitivity of 67%, PPV of 67%, specificity of 89%, NPV of 89%, histopathologic correlation of 84% while RMI 3 had significant (p<0.001) compatibility at the same level with sensitivity of 63%, PPV of 69%, specificity of 91%, NPV of 88% and a histopathologic correlation of 84%. Significant (p<0.001) compatibility for RMI 4 with a sensitivity of 67%, PPV of 73%, specificity of 92%, NPV of 89% and a histopathologic correlation of 86% was obtained at the cut-off level 400. Conclusions: RMI have a significant predictability in differentiating benign and malignant adnexal masses, thus can effectively be used in clinical practice.
Nurgul Ozbay,Adife Seyda Yargic 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-
Toxic metal bearing effluents can cause severe environmental contamination; thus metal removal by adsorption is a vital situation. In this study, apple pulp carbon was tested as low-cost adsorbent for the copper(II) and cobalt(II) adsorption studies. 25 full factorial experimental design was utilized to optimize the effects of pH, adsorbent dosage, initial metal ion concentration, contact time and temperature. ANOVA, F-test and Student’s t-test showed that Cu(II) and Co(II) adsorption is slightly temperature and contact time dependent but markedly increases with solution pH and adsorbent dosage. Although the initial Cu(II) concentration had a negative effect on removal efficiency, the initial Co(II) concentration had a positive effect. The suggested optimum conditions for 90.49% Cu(II) and 65.11% Co(II) removal were: pH 5, the adsorbent dosage = 0.4 g/50 mL, the initial metal ion concentration = 10 and 20 mg/L, temperature = 40 and 20 °C, contact time = 60 and 120 min, respectively. pH was found as significant within a 95% confidence level for both Cu(II) and Co(II) removal. Additionally, main effects of adsorbent dosage and initial concentration, the interaction effect of pH × initial concentration were also found as significant for Cu(II) removal. In conclusion, apple pulp carbon could be successfully applied for the removal of heavy metals because of its low-cost and abundance.
Cost optimization of high strength concretes by soft computing techniques
Erdogan Ozbay,Ahmet Oztas,Adil Baykasoglu 사단법인 한국계산역학회 2010 Computers and Concrete, An International Journal Vol.7 No.3
In this study 72 different high strength concrete (HSC) mixes were produced according to the Taguchi design of experiment method. The specimens were divided into four groups based on the range of their compressive strengths 40-60, 60-80, 80-100 and 100-125 MPa. Each group included 18 different concrete mixes. The slump and air-content values of each mix were measured at the production time. The compressive strength, splitting tensile strength and water absorption properties were obtained at 28 days. Using this data the Genetic Programming technique was used to construct models to predict mechanical properties of HSC based on its constituients. These models, together with the cost data, were then used with a Genetic Algorithm to obtain an HSC mix that has minimum cost and at the same time meets all the strength and workability requirements. The paper describes details of the experimental results, model development, and optimization results.
Cansu Ozbayer,Hulyam Kurt,Suna Kalender,Hilmi Ozden,Hasan V. Gunes,Ayse Basaran,Ecir A. Cakmak,Kismet Civi,Yusuf Kalender,Irfan Degirmenci 한국식품영양과학회 2011 Journal of medicinal food Vol.14 No.10
Diabetes is the leading cause of chronic renal failure. Our purpose was to determine the effects of N-nitro-l-arginine (l-NNA) and an extract of Stevia rebaudiana (Bertoni) (SrB) leaves on renal function in streptozotocin-nicotinamide (STZ-NA)–induced diabetic rats. Rats were divided into seven groups. Three of these groups were controls. Diabetes was induced by STZ-NA in the other four. Diabetic rats were treated with SrB (200 mg/kg), _L-NNA (100 mg/kg), or SrB + _L-NNA for 15 days after 5–8 weeks of diabetes. At the end of the experiments, urine and blood samples were collected from the rats, and kidney tissue samples were collected with the animals under ether anesthesia. Renal filtration changes were determined by measuring urine pH, urine volume, and serum and urine creatinine. Nitric oxide synthase (NOS) activity was measured in kidney homogenates. Alterations in kidney ultrastructure were determined by electron microscopy, and histological changes were examined by hematoxylin and eosin staining. No statistical differences were observed in urine creatinine or creatinine clearance. Even so, we observed higher NOS activity in SrB-treated diabetic rats. SrB-treated diabetic rats had less mitochondrial swelling and vacuolization in thin kidney sections than other diabetic groups. The control groups showed normal histological structure, whereas in the diabetic groups, membrane thickening, tubular epithelial cells, and cellular degeneration were observed. Thus, SrB has beneficial effects on diabetes compared with _L-NNA. Our results support the validity of SrB for the management of diabetes as well as diabetes-induced renal disorders.
Bulent Arasa,Fatih Ozbay 한국국방연구원 2008 The Korean Journal of Defense Analysis Vol.20 No.1
The Russian and Iranian governments define their relations as ""very close"" and ""strategic"" in many areas. The frontiers of this cooperation, in geopolitical terms, include the south Caucasus, central Asia, Afghanistan, and the oil- and natural gas-rich Caspian basin, while, at the issue level, the cooperation includes the nuclear issue, disarmament, the struggle against terrorism, the Iraqi quagmire, the Palestinian problem, and the U.S. military expansion into Eurasia. The signs of cooperation in these areas are, among others, regular political dialogue and similar attitudes in refusing to include the Lebanese Hizballah on terrorist lists, pursuing political relations with Hamas, maintaining a pro-Arab position on the Arab-Israeli question, objecting to foreign military engagement in Eurasia, and having a common voice during the Israeli-Lebanese conflict in 2006. However, we need to discover the nature of these relations in order to decide whether the close Russian-Iranian relations can be described as a strategic alliance. What is the strategic depth of Russian-Iranian relations? Do the relations consist merely of the conjectural necessities of the post-Cold War period? What are the ""red lines"" in Russian-Iranian relations? This article analyzes the relations between these two countries from a broader perspective, to examine the meaning of the relations in bilateral, regional and international contexts.
Effects of Milled Cut Steel Fibers on the Properties of Concrete
Okan Karahan,Erdogan Ozbay,Cengiz D. Atis,Mohamed Lachemi,Khandaker M. A. Hossain 대한토목학회 2016 KSCE JOURNAL OF CIVIL ENGINEERING Vol.20 No.7
This study presents the mechanical and transport properties of milled cut steel fiber reinforced concretes (MCSFRC). Properties studied include unit weight, workability, compressive strength, flexural strength, splitting tensile strength, bond strength, water absorption, water porosity, water sorptivity, rapid chloride ion permeability and drying shrinkage of concrete. Mixtures with a waterbinder ratio of 0.40, total binder content of 500 kg/m3 and milled cut steel fiber content of 0, 0.25, 0.50 and 1.00% by concrete volume were produced and tested. The laboratory results showed a slight reduction in compressive strength with the use of milled cut steel fiber. On the other hand milled cut steel fibers significantly improved the tensile strength and decreased the drying shrinkage. Although no significant increase was observed in the absorption, porosity and sorptivity, chloride ion permeability increased drastically with the increase of milled cut steel fiber content.
( Mindie H. Nguyen ),( Joseph Lim ),( A. Burak Ozbay ),( Jeremy Fraysse ),( Iris Liou ),( Laura Moore-schiltz ),( Geoffrey Dusheiko ),( Stuart Gordon ) 대한간학회 2017 춘·추계 학술대회 (KASL) Vol.2017 No.1
Aims: Little is known about the age, prevalence of comorbidities, and co-medications among U.S. patients with chronic hepatitis B (CHB). Our aim was to characterize these longitudinal trends in a large diverse population of U.S. CHB patients, between 2006 and 2015. Methods: We conducted a study of CHB patients ≥ 18 years of age (without HDV) who were continuously enrolled for 6 months before and after CHB diagnosis, using de-identified and U.S. administrative healthcare claims extracted from the Truven Health MarketScan® Commercial (general population), Medicare (older than 65), and Multi-State Medicaid (low income population) databases between 7/1/2004 and 6/30/2015. Results: We identified a total of 44,026 U.S. CHB patients. The median age of CHB patients increased from 47 in 2006 to 52 in 2015 (p<0.001). Deyo-Charlson Comorbidity Index scores increased over time from a mean of 1.1 in 2006 to 1.4 in 2015 (p<0.001). The proportion of CHB patients with diabetes, hypertension, and hyperlipidemia also increased significantly between 2006 and 2015 (p<0.001) (Figure). Specifically, from 2006 to 2015, diabetes increased from 12.2% to 17.7%, renal impairment increased from 9.8% to 16.7%, hypertension increased by almost two-fold from 22.0% to 37.3%, hyperlipidemia increased by almost 3-fold from 8.1% to 24.0%, and non-alcoholic fatty liver disease (NAFLD) increased over 2-folds from 1.7% to 5.2% (p<0.001). From 2006 to 2015, use of cardiovascular medications increased from 27.0% to 37.1% and use of antidiabetic medications increased from 10.3% to 13.2% (p<0.001). Conclusions: Between 2006 and 2015, the median age of patients with CHB significantly increased with increasing prevalence of associated comorbidities and concomitant medication use, up to 3-fold increase in some major comorbidities. The contribution of hepatitis B to these comorbidities in an aging population merits further analysis but advancing age and comorbidities in this group require appropriate management.