WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/20.500.14517/18

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Analysis and Implementation of Sensorless Pmsm Drive With Reduced Dc-Link Capacitance Under Parameter Variations
(Ieee, 2024) Sumsek, Reha Ozgur; Calik, Ramazan; Yavuz, Fikri Serkan; Kivanc, Omer Cihan
In AC drives used in heating, ventilation and air-conditioning applications, film capacitors are becoming widespread instead of electrolytic capacitors in DC-link. These drives with reduced capacitor value provide cost and volume advantages. However, dc-link oscillation increases due to the reduced capacity value. These oscillations cause instability, overvoltage and an increase in total harmonic distortion (THD). On the other hand, the winding temperatures of these motors, which operate continuously under rated operating conditions, reach 80 degrees C. The stator resistance and rotor flux value, which change with the increase in temperature, cause these drives, controlled without sensors, to operate even more unstable. In this study, a hybrid approach is proposed to improve the performance of the inverter using a 16 mu F film capacitor at the dc-link and to reduce the THD. The active damping method regulates the inverter output voltage for DC-link voltage stabilization. A permanent magnet synchronous machine (PMSM) sensorless speed control based on stator feedforward voltage estimation and a model reference adaptive system (MRAS) based on a multiparameter estimation algorithm is performed to minimize the effects of parameter variations. As a result of the experimental studies, it is observed that the grid input current complies with the IEC61000-3-2 standard, even under severe parameter variations.
Analysis of the Factors Affecting the Latency Period and Type of Birth in Patients With Preterm Prematur Rupture of Membranes
(Dokuz Eylul Univ inst Health Sciences, 2022) İlhan, Yunus; Kuzu, Ozan; Gozel, Sercan; Yumru, Ayşe Ender
Purpose: To determine the factors associated with the latent period in patients with preterm premature rupture of membranes (PPROM). Material and Methods: 53 patients who applied to our clinic within 1 year and were diagnosed with PPROM and met the inclusion criteria participated in this prospective cross-sectional study. Factors thought to affect the latent period in these patients were examined in terms of delivery time and mode. Results: Latent period; was negatively correlated with dilatation and positively correlated with collum length. The mean latent time of patients with contraction was statistically significantly lower than those without. In another model, gestational week, collum length and birth weight were found to be the most significant factors associated with the latent period. In the latent period groups; Statistically, a significant difference was found in the mean dilatation and collum length. The contraction rate was higher in those with a latency period of 2 days or less. Conclusion: Latent duration is inversely proportional to dilatation and directly proportional to collum length. Uterine contraction is higher in patients with a latency period of fewer than 2 days. Other statistically significant factors related to the latent period are the gestational week and the fetal weight.
Asthmatic Patients: Is Homocysteine an Issue?
(Galenos Publ House, 2024) Keskinel, Ilkay; Gunturk, Arzu; Eryilmaz, Muzeyyen
Objective: Understanding the causes of asthma is crucial for developing new therapeutic modalities. Homocysteine (HCY) is an intermediate in methionine metabolism. Elevated HCY levels may indicate folate and vitamin B12 deficiencies, which are cofactors for the methylation of HCY to methionine. The relationship between hyperHCY mia and atherosclerosis is well-documented, and it is considered a cause of cardiovascular, neurodegenerative, and ocular diseases. HyperHCY mia may also cause atopy and, consequently, asthma. We aimed to evaluate the levels of HCY, vitamin B12, and folic acid in asthmatic patients and healthy adults, as well as to determine whether correlations exist between these levels and lung function, eosinophil counts, total immunoglobulin E (IgE), and eosinophilic cationic protein (ECP) levels in asthmatic subjects. Methods: A total of 142 asthmatic patients and 36 healthy controls were enrolled in the study. Folic acid, vitamin B12, total IgE, ECP, eosinophil percentage, eosinophil counts, and HCY levels were evaluated in both groups. Results: HCY, vitamin B12, and folic acid levels did not significantly differ between patients with asthma and controls. There was a statistically significant positive correlation (at the 0.95 confidence level) between HCY values and forced vital capacity, peak expiratory flow (PEF), and eosinophil counts in patients with asthma. Folic acid levels correlated positively only with PEF%, whereas vitamin B12 levels did not correlate with any functional parameters or atopic markers like IgE and ECP. Conclusion: Should large-scale randomized controlled trials conclusively establish HCY as a causative factor of asthma, metabolic interventions to lower HCY levels using methyl donors could be considered alongside conventional asthma treatments.
Attıtudes of Female Employees In Nutrıtıon of 9 Months-6 Years Old Chıldren In Covıd-19
(Jpms Publ, 2024) Demir, Ibrahim; Onal, Ayse Emel; Ayvaz, Ozkan; Onal, Mehmet Erinc; Onal, Emel Ruya; Yildiz, Sevda Ozel
Background: We aimed to determine the factors affecting the nutritional attitudes of female hospital workers toward their children between 9 months and 6 years of age during the COVID-19 pandemic.Methods: Our study, which is an original article, was conducted with female employees working in the hospital and having children between the ages of 9 months and 6 years. The impact of changes in work and home life during COVID-19 on changes in child care and child nutrition has been questioned. Result: Statistical significance was detected between the scale and questions such as the frequency of anxiety regarding the child's illness during the COVID19 process, the decrease in the child's appetite, changes in the child's eating pattern, the mother's relationship with the environment and social relations, and the child's sleep pattern. Conclusion: A significant relationship was found between inadequate/unbalanced nutrition and educational status and between the reaction to others' opinions sub-dimension and age groups. Moreover, another significant relationship was found between the frequency of anxiety about the child's illness and the scale, and between the change in the child's nutrition pattern and the scale. The COVID-19 pandemic affected the attitudes of female employees towards the nutrition of their children.
Capital: an Introduction To the Three Volumes
(Palgrave Macmillan, 2024) Savran, Sungur
Capital: the Book of Communism
(Palgrave Macmillan, 2024) Savran, Sungur
Comparative Analysis of Transaction Performance in Different Virtualization Environments
(Istanbul Univ, 2024) Candemir, Ali Ihsan; Incereis, Nilgun
Virtualization technologies are increasing in importance day by day. The selection of virtualization software is an important factor to realize efficient use of physical hardware. In this study, the Ubuntu 22.04 LTS operating system was run on VirtualBox, VMware, and Docker, which are widely used virtualization software. Then, the Tiobench, Compress-7zip, C-ray, Smallpt, Tachyon, and OSBench tests were performed on the Ubuntu operating system with the Phoronix Test Suite software, and the test results were analyzed and compared. The results demonstrate that Docker outperformed the other virtualization technologies, although not in every test. Owing to its rapid deployment and efficient use of resources, Docker is suitable for applications that require agility and scalability. However, traditional virtualization technologies, such as VMware, may be more suitable for applications that require high security and extensive resource management. In addition, this study provides information that can guide users in selecting virtualization software.
Confusions Concerning Sraffa (and Marx): Reply To Critics
(Palgrave Macmillan, 2024) Savran, Sungur
The Controversy Between the Neo-Ricardians and the Marxists
(Palgrave Macmillan, 2024) Savran, Sungur
COVID-19 Seroprevalence in Cirrhotic Patients and Effect of COVID-19 Infection on Liver Cirrhosis by Clinical Form in the Postinfectious Period
(Galenos Publ House, 2024) Oenal, Ugur; Oezbey, Dogukan; Bakkaloglu, Oguz Kagan; Eskazan, Tugce; Kurt, Enes Ali; Hatemi, Ali Ibrahim; Sonsuz, Abdullah
Introduction: There are very few studies demonstrating the seroprevalence of coronavirus disease-2019 (COVID-19) in patients with cirrhosis worldwide and in Turkey. This study aimed to investigate the seroprevalence of COVID-19 in patients with cirrhosis and its effect on liver cirrhosis by clinical form in the postinfectious period. Methods: The study included 174 patients with cirrhosis. Patients with COVID-19 were identified using anti-severe acute respiratory syndrome-coronavirus-2-immunoglobulin G (SARS-CoV-2-IgG) and COVID-19 polymerase chain reaction assays and were divided into symptomatic and asymptomatic groups. The last polyclinic records of the patients before infection or testing were determined as 1 st examination and the date of blood collection for anti-SARS-CoV-2-IgG was determined as the 2 nd examination. Examination findings and liver tests of the patients in both periods were recorded; Child-Pugh Score (CPS) and Model for End Stage Liver Disease (MELD)-Na scores were calculated. Additionally, patients were evaluated for newly developed hepatic decompensation. Results: The seropositivity of anti-SARS-CoV-2-IgG was detected in 35.6% of our patients, and the rate of those who had symptomatic COVID-19 infection was 23.6%, whereas the rate of those who had asymptomatic infection was 12%. There was no significant difference in liver tests, CPS, and MELD-Na scores before and after COVID-19 infection between symptomatic and asymptomatic patients, and new decompensation was found in 9.6% of patients with COVID-19 infection. Conclusion: The incidence of COVID-19 among patients with liver cirrhosis is notably high. Although high decompensation rates were reported in the acute phase of the disease, such rates were not observed in the postinfectious period. Ultimately, our results indicated no significant difference in the course of existing liver disease according to clinical form.
Critique of Political Economy
(Palgrave Macmillan, 2024) Savran, Sungur
Design of a Position Controlled Electric Actuator Used in Fluid Control Valves
(IEEE, 2016) Tosun, Gurkan; Kivanc, O. Cihan; Oguz, Ender; Mutlu, Yasar; Ustun, Ozgur
Valves are the main elements for controlling fluids in industry and other application areas. To control flow precisely, valves need a controlled action which leads to implement actuators, gear systems and electronic controllers. Increasing dominance of electrical actuators due to the advantages of easy control and intervention and space-efficient designs brings seldom implementation of hydraulic and pneumatic actuation. In fluid control applications, the main target is to obtain the right position, i.e. angle for rotary actuators, for adjusting flow rate. In this study, the design and implementation of a position controlled electrically actuated valve used for fluid control are presented. The design phases of system universal power supply and electronic control system are given and the experimental results of position control which are representing the validation the design study is also discussed. Also a special current control scheme is used to overcome transient disruptions.
Effect of External Innovation Capacity on Company Level Innovativeness
(Management & Business Acad, 2019) Okatan, Kagan; Alankus, Orhan Behic
This study focuses on the correlation of national innovation inputs and the external innovation environment with the company-level innovation output. Since all companies are aiming at sustainable innovation to ensure sustainable profit growth, the current literature has highlighted the need for a well-structured internal innovation system for innovation success and discussed the factors affecting the performance of organisations. The internal innovation system has its own dimensions that affect the success of the whole system and emphasize the significant impact of firms on innovation results. Do all companies with a high internal innovation competency and a suitable corporate culture have the chance to become worldwide innovative? What are the impacts of the external environment where the companies are located on the innovation success? And how big is the importance of external environmental inputs? This study seeks to answer these questions and draws attention to the appropriate external environment and conditions to increase firms' innovation competencies.
Factors Affecting Thyroid Volume and the Incidence of Nodules With Goiter School-Aged Children
(Istanbul Univ, 2024) Kaba, Sultan; Dogan, Murat; Yavuz, Alpaslan; Kilic, Sinan
Objective: This study aimed to analyze the associations between age, sex, anthropometric factors, and thyroid volume as well as to determine the prevalence of goiter and thyroid nodules in school children. Methods: This study included schools governed by the Ministry of Education in Van province. Sonographic evaluations of thyroid glands were conducted in children aged 6-17 years, and measurements of weight, height, waist circumference, hip circumference, and skinfold thickness were obtained from the participants. Results: A total of 2284 school children were included in the study. The median age of the participants was 11.08 years. It was observed that thyroid volume exhibited a positive correlation with age, body surface area, body mass index, height, weight, waist circumference, hip circumference, triceps skinfold thickness, and subscapular skinfold thickness (p < 0.008). When assessing the association between age and goiter prevalence based on World Health Organization parameters, 10.2% of children and adolescents developed goiter, and 0.8% of these cases also had a nodule. Among girls, the rates were 9.4% and 1% for goiter and nodules, respectively, whereas among boys, the rates were 11.3% and 0.7%, respectively. Conclusions: Thyroid volume was affected by age, weight, subcutaneous tissue thickness, waist circumference, and BSA. Goiter remains a serious public health problem among school-age children in Van province.
Features Of Popular Sport Movies
(Ataturk Universitesi, 2022) Çetinkaya, G.; Kizilçam, M.
The aim of our study is to try to reveal the general features of popular sports movies. The research was pre-pared with the qualitative method and designed in the descriptive survey model. In this context, all sports movies in the IMDb database were scanned and 307 popular movies were included in the study. The data obtained through the SPSS 25.0 program were analyzed. According to the research findings; It is seen that American cinema leads popular sports movies (71.7%). It has been determined that sports is an important content in British cinema (8.5%) and Indian cinema. Boxing (11.7%), American football (11.1%), baseball (9.8%), racing sports (7.8%), basketball (7.2%), football (6.8%), and combat sports (6.2%) are other sports branches that are frequently featured in the films that are the subject of the research. The main theme that stands out in the movies is drama (65.80%). It was found that the other mostly covered themes were comedy (41.69%) and biography (22.80%). It is observed that popular sports movies make a great profit (69.34%). The arithmetic mean of the scores of the movies from the audience was found to be 6.75 out of 10. The metascore arithmetic mean is 48.57 out of 100. It has been concluded that popular sports films, which are one of the important contents for world cinema, have been appreciated by the audience in general, but cannot show the same success in the critics of cinema professionals. © Author(s).
The Impact of Climate Change Anxiety on the Willingness To Have Children Among Married Individuals
(Springer Heidelberg, 2024) Efeturk, Nida; Gokcay, Gonul; Akgun, Zeynep Genc; Cevirme, Ayse
AimThis study aims to examine the impact of climate change anxiety on the willingness to have children among married individuals.Subject and methodsThe research is designed as a descriptive study within a relational screening model. The study sample consists of 977 married individuals aged 18-49. Data collection tools include the Sociodemographic Information Questionnaire, Climate Change Anxiety Scale, and the Willingness to Have Children Scale. Data were evaluated using SPSS 27-V.ResultsAmong the participants, 73.2% are women, and 79.5% live in nuclear families. Participants scored an average of 28.58 +/- 9.212 on the Climate Change Anxiety Scale and 54.05 +/- 7.647 on the Willingness to Have Children Scale. The impact of individuals' climate change anxiety on their willingness to have children was determined using simple linear regression. The findings indicate that climate change anxiety significantly predicts the willingness to have children.ConclusionThe results of the study suggest that climate change has significant effects not only on the environment but also on psychological health, influencing individuals' decisions regarding having children. These findings highlight the need for climate change mitigation policies to consider psychological well-being alongside environmental solutions. It is recommended to implement awareness-raising education and establish psychological support mechanisms for different segments of society.
In the Tracks of Marx's capital Debates in Marxian Political Economy and Lessons for 21st Century Capitalism Introduction
(Palgrave Macmillan, 2024) Savran, Sungur; Tonak, E. Ahmet
An International Relations Study: Turks in the Western World's History Perspective and Ataturk's Approach
(Deniz Publication, 2022) Çora, H.; Çora, A.N.
Atatürk started numerous revolutions immediately after the war of independence, also called the struggle for national independence. The works conducted were about the content rather than the form. He desired the Turkish nation to take its rightful place among the world's nations. While building the foundations of the newly established state, on the one hand, he was making great efforts to improve the country's prestige and position abroad. At the beginning of the 20th century, the Western world treated the entire Eastern world, naturally to Turks, as second-class people and expressed this attitude on any occasion. Mustafa Kemal, who knew this case very well, decided to conduct comprehensive historical studies to achieve the following objectives: To refuse the accusations that were attributed to the Turks, which sometimes reached the level of insult; to introduce the true identity of the Turkish nation to the world; to get rid of the understanding of chronological history and to switch to the conception of social history in the country. At the end of the studies, a "Turkish History Thesis" was put forward. It was revealed that Turkish history was not limited to Islamic or Ottoman history. There was a pre-Islamic Turkish history with numerous achievements as many as post-Islamic history. Stating that history was not just the chronology, Ataturk gave the task of revealing the human aspect of history to Turkish historians in line with a study plan aiming to reveal the culture and civilization of Turkish history. © 2021, Assiut University, Faculty of Engineering. All rights reserved.
Investigating the Service Quality of Kocaeli Tram Service Using Artificial Neural Networks
(Turkish Chamber Civil Engineers, 2022) Dündar, Selim
Service quality is one of the main issues of today's world. Firms operating in the passenger transportation sector are also trying to improve the quality of the services they provide to their passengers. It is crucial to determine the passenger service quality perceptions and priorities to evaluate and improve the service in this context. In this study, Kocaeli tram user service quality perceptions have been evaluated by applying a survey consisting of 20 questions and user satisfaction levels from different service dimensions. Then, an artificial neural network model was developed using the demographic data of the users and their responses to the survey questions to mimic their service quality satisfaction. The artificial neural network model developed has been examined to understand the importance that tram users give to service quality. Using the developed “change of score” method, how the changes to be made in the tram system will affect the quality of service and, hence, how the opinions of different user groups will be affected can be examined in detail. The artificial neural network model prediction capability was compared with that of the multiple linear regression model, and found its superiority. Based on the developed Change of Score Method, the most frequent user attaches the highest importance to the service dimensions of the convenience to pay for the tram, getting his/her destination on time, and reducing environmental pollution.
Investigation of The Correlation Between Pain, Proprioception and Range of Motion in Patients With Temporomandibular Joint Dysfunction
(Dokuz Eylul Univ inst Health Sciences, 2024) Akdağ, Sercan; Aydın, Gamze
Purpose: The aim of study was to investigate the relationship between pain, proprioception and range of motion in patients with temporomandibular joint dysfunction (TMD). Material and Methods: The study was completed with 45 participants diagnosed with TMD and 45 healthy controls. Visual analog scale and graded chronic pain scale were used to assess pain intensity, dolorimeter was used for pain pressure threshold (PPT) assessment. Evaluation of cervical proprioception by cervical joint position error test (JPET), cervical joint range of motion assessment by digital goniometer, mouth opening measurements were made with a ruler. Results: In the study, pain intensity was high and PPT was low in the TMD group. In the JPET, the right-left rotation and left lateral flexion values in the TMD group had higher mean values than the control group (p=0.028, p=0.003, p=0.004, respectively). There was a significant difference between the groups in digital goniometer measurement in right-left rotation, right-left lateral flexion movements(p=0.008, p=0.001, p=0.041, p=0.005, respectively). The TMD group had a lower mean than the control group in painless, maximum assisted and unassisted mouth opening measurements(p=0.001, p=0.001, p=0.001, respectively). Conclusion: TMD patients presented a lower PPT, less accurate head repositioning, and some impairment in cervical range of motion.

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