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NONOSCILLATION RESULTS FOR A CLASS OF THIRD ORDER NONLINEAR DIFFERENTIAL EQUATIONS

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Applied Mathematics and Mechanics(English Edition) 2002年第10期23卷 1170-1175页

作者： Pakize Temtek 1, Aydn Tiryaki 2 (1 Department of Mathematics, Faculty of Arts and Science, Erciyes university, 38039, Kayseri, Turkey 2.Department of Mathematics, Faculty of Arts and Science, gazi university, Teknikokullar 06500 Ankara, Turke Department of Mathematics Faculty of Arts and Science Erciyes University Kayseri Turkey Department of Mathematics Faculty of Arts and Science Gazi University Ankara Turkey

Sufficient conditions for the nonoscillatory solutions of a class of third order nonlinear differential equations are presented. The results obtained generalize some criteria given by Parhi. In some special cases, som... 详细信息

关键词： differential equation nonlinear nonoscillatory solution Parhi criteria

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OSCILLATORY BEHAVIOUR OF A CLASS OF NONLINEAR DIFFERENTIAL EQUATIONS OF THIRD ORDER

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Acta Mathematica Scientia 2001年第2期21卷 182-188页

作者： A. Tiryaki Department of Mathematics, gazi university Faculty of Arts and Sciences Teknik Okullar, 06500 Ankara, Turkey S. (Yaman) Pasinlio■u Department of Mathematics, Hacettepe university, 06532 Beytepe, Ankara, Turkey Department of Mathematics Gazi University Faculty of Arts and Sciences Teknik Okullar 06500 Ankara Turkey Department of Mathematics Hacettepe University 06532 Beytepe Ankara Turkey

This paper investigates the oscillatory and nonoscillatory behaviour of solu- tions of a class of third order nonlinear differential equations. Results extend and improve some known results in the literature.

关键词： Oscillatory solution nonoscillatory solution behaviour of solution nonlinear differential equation

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Logical Image Acquisition and Analysis of Android Smartphones

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Journal of Computer and Communications 2024年第4期12卷 139-152页

作者： Nursel Yalçın Tayfun Yıldırım Department of Computer and Instructional Technologies Education Faculty of Education Gazi University Ankara T&#252rkiye Department of Computer Forensics Institute of Informatics Gazi University Ankara T&#252rkiye

Android smartphones largely dominate the smartphone market. For this reason, it is very important to examine these smartphones in terms of digital forensics since they are often used as evidence in trials. It is possible to acquire a physical or logical image of these devices. Acquiring physical and logical images has advantages and disadvantages compared to each other. Creating the logical image is done at the file system level. Analysis can be made on this logical image. Both logical image acquisition and analysis of the image can be done by software tools. In this study, the differences between logical image and physical image acquisition in Android smartphones, their advantages and disadvantages compared to each other, the difficulties that may be encountered in obtaining physical images, which type of image contributes to obtaining more useful and effective data, which one should be preferred for different conditions, and the benefits of having root authority are discussed. The practice of getting the logical image of the Android smartphones and making an analysis on the image is also included. Although root privileges are not required for logical image acquisition, it has been observed that very limited data will be obtained with the logical image created without root privileges. Nevertheless, logical image acquisition has advantages too against physical image acquisition.

关键词： Android Smartphone Forensics Data Acquisition Data Analysis Root Privileges Digital Forensics

Assessment of the potential interactions between favipiravir and radiocontrast agents

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World Journal of Radiology 2024年第5期16卷 128-135页

作者： Sonay Aydin Ozlem Celik Aydin Mesut Furkan Yazar Huseyin Aydemir Mecit Kantarci Sureyya Barun Department of Radiology Erzincan Binali Yıldırım UniversityFaculty of MedicineErzincan 24100Türkiye Department of Pharmacology Gazi UniversityFaculty of MedicineErzincan 24100Türkiye Department of Radiology Bilecik Education and Reseach HospitalBilecik 11230Türkiye Department of Radiology Atatürk UniversityFaculty of MedicineErzurum 25030Türkiye

BACKGROUND In cases of coronavirus disease 2019(COVID-19),favipiravir is commonly included to the therapy regimen.Drug interactions between favipiravir and other COVID-19 therapy drugs are frequently researched.However,no research on possible drug interactions between Favipiravir and radiocontrast agents,which have become almost crucial in diagnostic processes while not being part of the treatment,has been found.AIM To determine potential medication interactions between Favipiravir and radiocontrast agents.METHODS The study comprised patients who were taking Favipiravir for COVID-19 therapy and underwent a contrast-enhanced computed tomography(CT)or magnetic resonance imaging(MRI)test while taking the medicine.The computerized patient files of the cases included in the study,as well as the pharmacovigilance forms in the designated hospital,were evaluated for this purpose.RESULTS The study included the evaluation of data from 1046 patients.The study sample's mean age was 47.23±9.48 years.The mean age of cases with drug interactions was statistically significant greater than that of cases with no drug interactions(P=0.003).When evaluated with logistic regression analysis,a 1-year raises in age increases the risk of developing drug interactions by 1.63 times(P=0.023).There was no statistically significant difference in the occurrence of medication interactions between the sexes(P=0.090).Possible medication interactions were discovered in 42 cases(4%).CONCLUSION The findings of this study revealed that the most notable findings as a result of the combined use of contrast agents and favipiravir were increased creatinine and transaminase values,as well as an increase in the frequency of nausea and vomiting.The majority of drug interactions discovered were modest enough that they were not reflected in the clinic.Drug interactions become more common as people get older.

关键词： Favipiravir Iohexol Gadoxetic acid Meglumine gadoterate Drug interactions

The development of ultralightweight expanded perlite-based thermal insulation panel using alkali activator solution

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Frontiers of Structural and Civil Engineering 2022年第11期16卷 1486-1499页

作者： Damla Nur CELIK Gökhan DURMUŞ Civil Engineering Department Technology FacultyGazi UniversityAnkara 06500Turkey

The International Energy Agency(IEA)states that global energy consumption will increase by 53%by 2030.Turkey has 70%of the world’s perlite reserves,and in order to reduce energy consumption a thermal insulation panel was developed in Turkey using different particle sizes of expanded perlite(EP).In this study,0–1.18 mm(powder)and 0–3 mm(granular)EP particle sizes were selected,since they have the lowest thermal conductivity coefficients among all the particle sizes.In addition,an alkali activator solution was used as a binder in the mixtures.The alkaline activator solution was obtained by mixing sodium hydroxide solution(6,8,10,and 12 mol·L−1)and sodium silicate(Module 3)at the different ratios of Na2SiO3 to NaOH of 1,1.5,2,and 2.5.This study aimed to experimentally determine the optimum binder and distribution ratio of EP,with the lowest coefficient of thermal conductivity and the lowest density.The lowest thermal conductivity and the lowest density were determined as 0.04919 W·m−1·K−1 and 133.267 kg/m3,respectively,in the sample prepared with 83.33%powder-size EP,6 mol·L−1 sodium hydroxide solution,and ratio of Na2SiO3 to NaOH of 1.5.The density,thermal conductivity,and compressive strength of the sample showed the same trends of behavior when the Na2SiO3 to NaOH ratio was increased.In addition,the highest compressive strength was measured in 12 mol·L−1 NaOH concentration regardless of particle size.In conclusion,the study predicts that the EP-based thermal insulation panel can be used as an insulation material in the construction industry according to the TS825 Thermal Insulation Standard.

关键词： expanded perlite alkali activator thermal insulation panel thermal conductivity

Role of natural products and intestinal flora on type 2 diabetes mellitus treatment

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World Journal of Clinical Cases 2023年第1期11卷 65-72页

作者： Ozlem Celik Aydin Sonay Aydın Sureyya Barun Department of Medical Pharmacology Erzincan Mengücek Gazi Training and Research HospitalErzincan 24100Turkey Department of Radiology Erzincan Binali Yıldırım UniversityMengücek Gazi Training and Research HospitalErzincan 24100Turkey Department of Medical Pharmacology Gazi University Faculty of MedicineAnkara 06500Turkey

Diabetes mellitus(DM)is a complicated,globally expanding disease that is influenced by hereditary and environmental variables.Changes in modern society’s food choices,physical inactivity,and obesity are significant factors in the development of type 2 DM(T2DM).The association between changes in intestinal flora and numerous disorders,including obesity,diabetes,and cardiovascular diseases,has been studied in recent years.The purpose of this review is to analyze the mechanisms underlying the alteration of the diabetic patients’intestinal flora,as well as their therapeutic choices.Also included is a summary of the antidiabetic benefits of natural compounds demonstrated by studies.The short-chain fatty acids theory,the bile acid theory,and the endotoxin theory are all potential methods by which intestinal flora contributes to the establishment and progression of T2DM.Due to an intestinal flora imbalance,abnormalities in shortchain fatty acids and secondary bile acids have been found in diabetic patients.Additionally,metabolic endotoxemia with altering flora induces a systemic inflammatory response by stimulating the immune system via bacterial translocation.The agenda for diabetes treatment includes the use of short-chain fatty acids,probiotics,prebiotics in the diet,fecal bacteria transplantation,and antibiotics.Animal studies have proven the antidiabetic benefits of numerous bioactive substances,including Flavonoids,Alkaloids,Saponin,and Allicin.However,further research is required to contribute to the treatment of diabetes.

关键词： Diabetes mellitus Intestinal flora Natural products Endotoxemia Bioactive compounds Probiotics

Using Metaheuristic OFA Algorithm for Service Placement in Fog Computing

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Computers, Materials & Continua 2023年第12期77卷 2881-2897页

作者： Riza Altunay Omer Faruk Bay Department of Information Systems Gazi UniversityAnkara06680Turkey Department of Computer Technologies Ondokuz Mayis UniversitySamsun55100Turkey Department of Electrical-Electronics Engineering Gazi UniversityAnkara06560Turkey

The use of fog computing in the Internet of Things(IoT)has emerged as a crucial solution,bringing cloud services closer to end users to process large amounts of data generated within the system.Despite its advantages,the increasing task demands from IoT objects often overload fog devices with limited resources,resulting in system delays,high network usage,and increased energy consumption.One of the major challenges in fog computing for IoT applications is the efficient deployment of services between fog clouds.To address this challenge,we propose a novel Optimal Foraging Algorithm(OFA)for task placement on appropriate fog devices,taking into account the limited resources of each fog node.The OFA algorithm optimizes task sharing between fog devices by evaluating incoming task requests based on their types and allocating the services to the most suitable fog nodes.In our study,we compare the performance of the OFA algorithm with two other popular algorithms:Genetic Algorithm(GA)and Randomized Search Algorithm(RA).Through extensive simulation experiments,our findings demonstrate significant improvements achieved by the OFA algorithm.Specifically,it leads to up to 39.06%reduction in energy consumption for the Elektroensefalografi(EEG)application,up to 25.86%decrease in CPU utilization for the Intelligent surveillance through distributed camera networks(DCNS)application,up to 57.94%reduction in network utilization,and up to 23.83%improvement in runtime,outperforming other algorithms.As a result,the proposed OFA algorithm enhances the system’s efficiency by effectively allocating incoming task requests to the appropriate fog devices,mitigating the challenges posed by resource limitations and contributing to a more optimized IoT ecosystem.

关键词： Internet of Things cloud computing fog computing

Defining the awareness and attitude of the clinicians through pharmacovigilance in Turkey

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World Journal of Clinical Cases 2023年第20期11卷 4865-4873页

作者： Ozlem Celik Aydin Sonay Aydin Hakki Zafer Guney Department of Medical Pharmacology Gazi University Faculty of MedicineAnkara 06500Turkey

BACKGROUND Pharmacovigilance(PV)is the activities and scientific studies conducted to detect,evaluate,understand or prevent adverse reactions and other drug-related problems.AIM To define the awareness and experiences of the clinicians on PV and adverse drug reactions(ADRs)in Turkey.METHODS The study was cross-sectional and analytical.Data were obtained through a questionnaire.The questionnaire was sent via e-mail.The survey was sent to 2030 physicians and 670 participated.RESULTS The most appropriate definition of PV was correctly defined by 53.9%of the participants.The most important goal of PV was correctly defined by 54.9%of the participants,and 27.3%of the participants were aware of the Turkish Pharmacovigilance Center.Nonsurgical physicians had better PV knowledge than surgical physicians.A total of 80.9%of the physicians who encountered ADRs,filled in the ADR notification form,and 8.8%received training on how to fill in the form.PV knowledge of the clinicians was not sufficient.Although half of the physicians encountered ADRs,the rates of seeing and filling in the ADR form were low.CONCLUSION Few of the physicians followed the current information about PV.The results provide more comprehensive data on PV practices and ADR reporting at a national level.

关键词： Pharmacovigilance Physicians Knowledge level Attitude Behavior Adverse drug reaction

Invisible face of COVID-19 pandemic on the freshwater environment:An impact assessment on the sediment quality of a cross boundary river basin in Turkey

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International Journal of Sediment Research 2022年第2期37卷 139-150页

作者： Cem Tokatl? Laboratory Technology Department Evrenos Gazi Campus Trakya University

In the current research,the impact of the COVID-19 lockdown period on sediment quality of the MericErgene River Basin was evaluated by determining the potentially toxic elements(PTEs) in sediment samples collected from 25 sampling points in the basin.Also some important ecological indicators including potential ecological risk index(PERI),contamination factor(CF),pollution load index(PLI),biological risk index(BRI),and geo-accumulation index(I) and some important statistical indicators including the Pearson correlation index(PCI),factor analysis(FA),and cluster analysis(CA) were applied to collected data.Levels of all the investigated PTEs in sediment of the basin show significant differences between the pre-lockdown and lockdown periods.The PTE contents have considerably decreased by12.8%-45.4% during the lockdown period.Similarly,the results of applied sediment quality risk assessment indices showed significant improvement and the values have decreased by 22.4%-35.8%.In the lockdown period,reduction of industrial activities or limited production at many industrial facilities located in the basin reduced the amount of effluent,leading to significant improvement in sediment quality.

关键词： Meriç–Ergene River basin Sediment quality Ecological–statistical indicators COVID-19 pandemic Lockdown period