TR-Dizin İndeksli Yayınlar Koleksiyonu

Permanent URI for this collectionhttps://acikerisim2.beykoz.edu.tr/handle/20.500.12879/4

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Analyses of Chemical and Physical Egg Quality Parameters of Laying Hens Housed in Different Conditions in Turkey
(Sakarya University, 2023) Uysal Afacan, R.S.
The aim of the present study is to determine the content of chemical and physical quality parameters of hen eggs (liquid whole egg (LWE), liquid egg yolk (LEY), and liquid egg white (LEW)) produced for different housing and feeding conditions in Turkey. Chemical quality parameters (protein, lipid, and moisture) and physical quality parameters (total soluble solid (°Brix), pH, conductivity, and yolk:white ratio) were analyzed using different egg samples. Kjeldahl, wet ashing, and oven-drying official methods were used for the protein, total lipid, and moisture analyses of egg samples. The highest protein content in the LEY and LEW samples were found to be 19.0% and 15.13%, respectively for the tenth sample having fortified feeding (selenium+DHA) parameters. For LWE samples, it was also obtained 15.65% with the second sample having a not fortified feeding parameter. The highest total lipid content for LWE samples was determined as 10.43% for the seventh sample which housed under cage free conditions and fed with organic (omega3+EPA+DHA) fortifiers, while it was found with a value 25.7% for the second and third LEY samples possessing a not fortified feeding parameters. The highest moisture content was determined as 78.37%, 54.64%, and 89.11 for thirty-first LWE sample (with not fortified feeding), third LEY sample (with not fortified feeding) and sixth LEW sample (having cage free and organic parameters), respectively. As a result, the minimum, average, and maximum contents of the chemical and physical quality parameters were determined for laying hen eggs raised in several housing and feeding conditions in Turkey. © 2023, Sakarya University. All rights reserved.
Competitive Advantage and Clusters: What Can We Learn from Nine Turkish Clusters
(Boğaziçi University bjournal@boun.edu.tr, 2018) Mutlucan, N.Ç.
Many researchers have studied the ability of clusters to promote innovation, regional economic development, and national prosperity; however, these studies had been mostly conducted at the cluster level, not at the firm level. This study attempts to bring the cluster discourse back to the firm by answering the following research question: how do firms create and defend competitive advantages through clusters? The theoretical model presumes positive relationships between several constructs and firm performance, namely, business ties, support ties, entrepreneurial orientation and strategic learning capability. Furthermore, these relationships are supposed to be enhanced by the moderating effect of the cluster construct. The Partial Least Squares path model analysis of data from 160 surveyed firms located in nine Turkish clusters revealed that only entrepreneurial orientation and support ties contributed significantly and positively to firm performance. © 2018 The Trustees of Indiana University. All rights reserved.
Detection of Damaged Structures from Satellite Imagery Processed by Autoencoder with Boruta Feature Selection Method
(AVES, 2023) Muzoglu, Nedim; Adiguzel, Ertugrul; Akbacak, Enver; Karaslan, Melike Kaya
Many worldwide changing events, including meteorology, weather forecasting, disaster response, and environmental monitoring, are tracked by states or companies via satellite imagery. Early response to disasters is critical for human life. In these cases, artificial intelligence applications are also used to make rapid determinations about large geographical region. In this study, satellite images of flooded and undamaged structures in Hurricane Harvey were used. An autoencoder process has been applied to this dataset to reduce the noise in satellite imagery. AlexNet and VGG16 deep learning (DL) models are used to extract features from both datasets. The most effective features selected by the Boruta feature selection algorithm were classified with the support vector machine, and the highest classification accuracy of 99.35% was obtained. Since disasters involve the evaluation of very big datasets from large geographic areas, presenting the data with the smallest possible feature will facilitate the process. For this reason, by applying dimensionality reduction to the selected attributes, a 98.29% success was achieved in the classification with only 90 attributes. The proposed approach shows that DL and feature engineering are very effective methods to quickly respond to disaster areas using satellite imagery.
Determination of the Anticarcinogenic Activity of 5-Hydroxymethyl-2-furfural Produced from Grape Must Under in Vitro Conditions
(Turkish Chemical Society, 2023) Kelleci, K.; Gölebatmaz, E.
Every year, millions of tons of food and beverage waste are thrown away unused around the world. The carbohydrates found in food waste create a raw material potential for the production of high value-added products that are used in energy, feed and pharmacology. One of these products, 5-Hydroxymethyl-2-furfural (5-HMF), is a by-product of simple dehydration of carbohydrates. It finds wide use in the field of pharmacy due to its anticancer, antifungal and antimicrobial activities. Many studies have stated that the sugar source with the highest conversion rate in 5-HMF production is fructose. For this reason, in this study, it was aimed to realize the production of 5-HMF in autoclave sterilization carried out under high temperature and pressure using grape must waste, which is known to have high fructose content, and determine the anticarcinogenic activity and cytotoxicity of the produced 5-HMF under in vitro conditions. In this study, it was determined that the medium containing DMSO increased the sugar conversion percentage, 5-HMF efficiency and selectivity in the waste grape must more than the medium containing only water. In the production of 5-HMF, the conversion of sugar in the medium saturated with salt, and the efficiency and selectivity of 5-HMF were determined as 97.04%, 68.61% and 70.82%, respectively, when DMSO organic solvent was used. In addition, it has been determined that 5-HMF produced from waste grape must has a toxic effect on both healthy cells and cancer cells and has anticancer properties. © 2023, Turkish Chemical Society. All rights reserved.
Fault Detection in Pipelines with Graph Convolutional Networks (GCN) Method
(Gazi Üniversitesi, 2024) Şahin, E.; Yüce, H.
Pipeline networks have a wide range of applications, from the transportation of energy sources such as oil and natural gas to the conveyance and distribution of water resources. However, leaks and ruptures in pipelines can cause significant harm to the environment. Therefore, it is crucial to accurately detect pipeline faults in order to avoid economic losses and protect the environment. In this study, pipeline networks carrying water fluid are represented using graph structures. The graph convolutional network (GCN) algorithm is employed for the detection of leaks and blockages in pipeline networks. Experimental methods are employed to collect the necessary data (pressure data) for the GCN algorithm, creating two datasets by considering five different scenarios. The fault detection performance of the GCN algorithm is compared with other graph machine learning algorithms, namely, RGCN, HinSAGE, and GraphSAGE. The results of this study indicate that the performance of the GCN model surpasses that of the other algorithms. Reviewing the literature, accuracy rates for fault diagnosis in pipeline networks using machine learning algorithms range from 78.51% to 99%. In this study, it is found that the GCN, GraphSAGE, HinSAGE, and RGCN algorithms achieve fault detection accuracies of 91%, 90%, 87%, and 89%, respectively, in pipeline networks. Classical machine learning SVM model was used to compare the performance of graph-based algorithms. It is seen that the performances of the algorithms face the literature and the results are above the literature average. © 2024 Gazi Universitesi. All rights reserved.
Forensic Interview with Child Victims of Sexual Abuse in Turkey: The Interviewer’s Subjective Experience
(Association for Clinical Psychology Research, 2023) Ustun Gullu, B.; Erden, G.
Child abuse and neglect is an important social problem affecting millions of children and their families around the world. Regardless of the physical, emotional, or sexual abuse, in the judicial process regarding child abuse, it is very important to collect and evaluate the physical, biological, and psychological findings correctly, as well as forensic interviews with the victim child. Forensic interview is an interview in which information about the incident is collected, whether the crime has been revealed, and the obtained information is analyzed in a psychological and legal framework, with an impartial approach to the victim or suspect in judicial incidents. In the forensic interview process, the issues related to the evaluation of the reliability of the child’s statement, the knowledge, skills, experiences, and needs of the forensic interviewers, the interview environment and conditions are important issues. In this direction, the aim of our research was trying to create a descriptive framework for the competence and effectiveness of forensic interviewing through qualitative analysis. Forensic interviewers from 3 different cities with forensic interview experience were selected in the study. Six forensic interviewers were employed in the study. Semi-structured interviews were conducted with the interviewees by using the interview form prepared in accordance with the working areas and interview processes of the forensic interviewers, and the interview records were evaluated using Interpretive Phenomenological Analysis (IPA). As a result of the examination of the interviews, eight repetitive themes were determined and concrete quotations from the discourses of the participants were given for each top theme. The results obtained are discussed in the literature. © 2023 Association of Clinical Psychology Research. All rights reserved.
The Intolerance of Uncertainty Scale for Children: Reliability, Validity and Adaptation Study
(Klinik Psikiyatri dergisi, 2024) Erden, Gulsen; Celik, Cihat
Objective: The aim of this study is to adapt the Intolerance of Uncertainty Scale for Children (IUSC) into Turkish. Method: The sample of the study consists of 282 children aged 7-12 (M= 9.55, SD = 1.81) and their parents (M= 36.84, SD = 7.04). The Uncertainty Intolerance Scale (IUSC) for Children-Parent Form and Spence Anxiety Scale for Children-Parent (SASC-P) Form were used. The Cronbach Alpha internal consistency and two half test reliability coefficients were calculated for the reliability of the IUSC. Confirmatory Factor Analysis (CFA) was conducted for construct validity and the relationships between the IUSC and the SASC-Parent Form for content validity were evaluated. Results: The CFA analyzes revealed that the 12-item short form of the IUSC had good fit values, and one-factor and two-factor structure were confirmed. As a result of the analyzes significant correlations were found between the total score of the child and parent forms of IUSC-12 and the sub-factors of the SASC-P form, separation anxiety, panic attack, social phobia, obsessive compulsive disorder and agoraphobia scores (child form respectively, r = .25, r = .37, r = .40, r = .25, r = .25; p < .001; parent form respectively, r = .26 , r = .32, r = .43, r = .31, r = .22; p < .001). The reliability analyzes revealed that Cronbach Alpha coefficient for the child form of the IUSC-12 short form was .91 and for the parent form .91. The two half-test Spearman-Brown correlation coefficients were found to be r = .89 for the child form and r = .90 for the parent. Discussion: The results show that parent and child form of the IUSC-12 short form provide reliable and valid results in evaluating the intolerance of uncertainty levels of children in Turkey.
Investigation of Functional Status, Balance and Kinesiophobia in Women with Hallux Valgus Underwent Chevron Osteotomy, a Pilot Study
(Turkish Physiotherapy Association, 2022) Meran Çağlar, M.; Kinikli, G.İ.; Çaǧlar, Ö.
Purpose: The aim of this study, was to investigate functional status, balance and kinesiophobia after Chevron osteotomy in women with Hallux Valgus (HV) in comparison to non-surgical women with HV. Another aim was to compare the pre- and post-surgical radiographic values of women with HV who underwent surgery. Methods: A total of 38 individuals were included in the study, including aged 20-70 years 19 women with an average of 28 months after surgery and 19 HV women diagnosed with non-surgical. Individuals' pain intensity (Visual Analogue Scale), thumb joint range of motion (ROM) (universal goniometer), static balance (Single-Leg-Stance Test), dynamic balance (Timed Up and Go Test), functional status and cosmetic concern (Multidimensional Nil Hallux Valgus Scale), kinesiophobia (Tampa Kinesiophobia Scale) was evaluated. Results: Pain severity, cosmetic concern, ROM of the thumb and HV angle (HVA) were lower in women with HV following surgery than non-surgical HV women (p<0.001); functional scores were better than women with non-surgical HV (p<0.05). Balance and kinesiophobia scores were similar in both groups (p>0.05). However, the average kinesiophobia scores in both groups (surgical: 36.20 ± 5.35; non-surgical: 36.44 ± 5.40) were above the mean score of the scale. HVA and 1-2 intermetatarsal angle of the surgical group showed significant improvement compared to the values before surgery (p <0.001). Conclusion: The results of this study showed that the total ROM of thumb is limited and long-term post-surgical kinesiophobia in women with HV. For a comprehensive evaluation of these individuals, it should be taken into consideration that joint movements and kinesiophobia evaluations should be added to physiotherapy and rehabilitation programs before and after surgery. © 2022 Turkish Physiotherapy Association. All rights reserved.
Lumbar Spine Implant Design with Finite Element Method and Determination of Biomechanical Effects
(Gazi Univ, Fac Engineering Architecture, 2023) Taherzadeh, Paniz; Kelleci, Kubra; Ozer, Sevil
Graphical/Tabular The restoration percentages of two different implants designed and simulated in six different directions are given in Figure A. Figure A. Restoration percentages of theimplant 1 and implant 2 devices in six different directionsPurpose: In this study, it was aimed to design a new pedicle-screw based posterior dynamic stabilization implant that can help stabilize the spine normally. In the study, two different implants were designed using the finite element method (FEM) and their biomechanical effects were compared.Theory and Methods: Stable and treated models of the lumbar spine with two different implants were simulated under physiological loading conditions according to Computed tomography data. Implant and device components were created with the SOLIDWORKS program. All designed devices were used together with ABAQUS CAD simulation program and MATLAB program to calculate range of motion, adjacent level effect and restoration percentages in six different directions (right-left axial rotation, right-left lateral bending and flexion-extension). In the study, 70% restoration percentage, which is an acceptable value in the movement of the spine with the implant, was tried to be achieved in all directions.Results: With the second device, which obtained optimum data and was found to be more flexible, a higher percentage of restoration was obtained in the Z and Y axes. Restoration values are 33% for extension, 53% for flexion, and 68% and 55% for lateral bending and axial rotations, respectively.Conclusion: It can be said that pedicle-screw implants designed with this simulation study will be applicable after experimental validation and clinical trials
Making Sense of Turkey’s Foreign Policy from the Perspective of Neorealism
(Uluslararası İlişkiler Konseyi Derneği, 2023) Oguzlu, Tarik; Han, Ahmet Kasim
This study singles out the impact of systemic and external factors on Turkey's foreign policy from the establishment of the Republic until now. Such an exercise accords with a neorealist interpretation of foreign policy, as the key emphasis is on the impact of the anarchical nature of the external environment, and the influence of the distribution of material power capabilities among states at a given time on foreign policy preferences. This in no way suggests that the internal and individual level of factors holds a secondary place in comparison to systemic/external factors. Yet this article simply highlights the importance of systemic factors, for the main reason that neorealism seems to account for foreign policy choices and behaviors of middle powers more convincingly than in the case of great powers.
De Novo Malignancy Development Following Kidney Transplantation: Managing Risks and Outcomes in Clinical Practice
(Galenos Publ House, 2025) Huseynov, Amil; Cicek, Sevim Nuran Kuslu
Objective: Denovo malignancy is a significant complication following kidney transplantation, attributed to prolonged immunosuppression.This study evaluates the incidence, risk factors, and clinical outcomes of denovo malignancies in kidney transplant recipients. Material and Methods: A retrospective cohort analysis was conducted on 1200 kidney transplant recipients between 2016 and 2023. Patients were categorized based on the presence or absence of de novo malignancies. Statistical analyses were performed to identify risk factors, including age, sex, comorbidities, and immunosuppressive regimens. Patient and graft survival were assessed using Kaplan-Meier analysis and the log-rank test. Results: Among the study population, 43 patients (3.6%) developed de novo malignancies. The most frequent malignancy types were non-melanoma skin cancers (27.9%) and post-transplant lymphoproliferative disorders (18.6%). Patients with malignancies exhibited a lower three-year survival rate (83.7%) compared to those without malignancies (91.4%), though the difference was not statistically significant (p=0.067). Graft survival at three years was slightly lower in the malignancy group (84.0% vs. 88.7%, p=0.146). Older recipient age was identified as a significant risk factor (hazard ratio=1.03 per year, p=0.025). Conclusion: De novo malignancy remains a concern in kidney transplant recipients, particularly among older patients. Regular screening protocols, lifestyle interventions, and individualized immunosuppressive regimens are essential to mitigate risk and improve outcomes.
Where Can Urodynamic Testing Help Assess Male Lower Urinary Tract Symptoms
(AVES, 2019) Gurbuz, Cenk; Drake, Marcus J.
Urodynamic studies assess the function of the bladder and bladder outlet. They are often useful in the assessment and diagnosis of patients presenting with lower urinary tract symptoms (LUTS). The evidence regarding the value and risks of invasive urodynamics remains insufficient. However, men with LUTS who are assessed by invasive urodynamics are more likely to have their management changed and less likely to undergo surgery. This review discusses the role of urodynamic diagnosis and application in the diagnosis and treatment of male LUTS.

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