Branch Retinal Artery Occlusion in Patient with COVID-19: Case Report

Orhan Ateş,Mustafa Yıldırım,Kenan Yıldırım 대한안과학회 2021 Korean Journal of Ophthalmology Vol.35 No.6

Experimental Investigation for Group Efficiency of Driven Piles Embedded in Cohesionless Soil

Bayram Ateş,Erol Şadoğlu 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.12

In cases where stiffness and bearing capacity of soil aren’t sufficient to carry loads of a structure, depth of the foundation of the structure can be increased by using a pile group to transmit the loads to the soil layers with high bearing capacity. The behaviour of the pile group is discrepant with the response of a single pile due to the pile-pile and the pile-soil interactions. Therefore, extensive experimental and numerical studies have been performed for reliable and economical design of the pile groups. Even so, group efficiency (η) received no attention from researchers. Therefore, it is intended to investigate experimentally the group efficiency in this study. The pile groups with different pile spacings were tested in sandy soil with loading tests. The tests were performed at various relative densities and L/D ratios with the pile groups. After the small-scale tests, the determined group efficiency was compared with the existing methods. As a result, the influences of the pile length, diameter, spacing, and relative density on the group efficiency are investigated. From the results of the tests, it was found that although the conventional empirical formulas on pile group behaviour is that group efficiency is smaller than 1, the group efficiency for driven piles in cohesionless soils ranged between about 1.31 and 1.66 in this study.

Eff ectiveness of Soil–Structure Interaction and Dynamic Characteristics on Cable-Stayed Bridges Subjected to Multiple Support Excitation

Şevket Ateş,Zeliha Tonyali,Kurtuluş Soyluk,Adamou Marou Seyni Samberou 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.2

The purpose of the study is to determine the eff ects of multiple support excitations (MSE) and soil–structure interaction (SSI) on the dynamic characteristics of cable-stayed bridges founded on pile foundation groups. In the design of these structures, it is important to consider the eff ects of spatial variability of earthquake ground motions. To do this, the time histories of the ground motions are generated based on the spatially varying ground motion components of incoherence, wave-passage, and site-response. The eff ects of SSI on the response of a bridge subjected to the MSE are numerically illustrated using a three-dimensional model of Quincy Bayview cable-stayed bridge in the USA. The soil around the pile is linearly elastic, homogeneous isotropic half space represented by dynamic impedance functions based on the Winkler model of soil reaction. Structural responses obtained from the dynamic analysis of the bridge system show the importance of the SSI and the MSE eff ects on the dynamic responses of cable-stayed bridges.

Experimental and Numerical Investigation of Load Sharing Ratio for Piled Raft Foundation in Granular Soils

Bayram Ateş,Erol Şadoğlu 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.4

If the rigidity and the bearing capacity of the soil under a superstructure are not efficient to bear loads of structures, a common remedy is to increase the depth of the footing to transmit loads to soil layers having high bearing capacity (well graded dense gravel, gravelly sand, hard clay, rock, etc.) by using the pile group. Piled raft foundation (PRF) has come a significant footing system of late years due to that it combines load-carrying capacities of piles and raft. Therefore, extensive empirical, numeric and analytical studies have been carried out for reliable design of these footing system. Nonetheless, the load sharing ratio (LSR) between the driven piles and the raft received no attention from researchers. It is aimed to examine the LSR between the driven pile group and the raft in this study. Therefore, a testing apparatus was set up, and loading tests were carried out including the raft and the piled raft cases. Thus, the LSR of the piles and the raft were measured by means of the tests, and the effect of the pile length and relative density on this ratio was also investigated. The model of the test setup was determined numerically for same loading conditions and the material properties by using ABAQUS software. From the test and finite element analysis results, it has been found that rafts share foundation loads at such levels that should not be ignored. Vertical settlements of raft foundations at certain loads are found to be greater than the settlements of piled raft foundations at the same loads. Relative density was observed to be effective in the range of 1 − 2% on the LSR of the piles in PRFs. In addition to this, the length of the pile was found to be more effective on this ratio in the range of 11 − 14%.

Collapse of steel cantilever roof of tribune induced by snow loads

Ahmet C. Altunışık,Şevket Ateş,Metin Hüsem,Ali F. Genç 국제구조공학회 2017 Steel and Composite Structures, An International J Vol.23 No.3

In this paper, it is aimed to present a detail investigation related to structural behavior of laterally unrestrained steel cantilever roof of tribune with slender cross section. The structure is located in Tutak town in A&$287;rı and collapsed on October 25, 2015 at eastern part of Turkey is considered as a case study. This mild sloped roof structure was built from a variable I beam, and supported on steel columns of 5.5 m height covering totally 240 m² closed area in plan. The roof of tribune collapsed completely without any indication during first snowfall after construction at midnight a winter day, fortunately before the opening hours. The meteorological records and observations of local persons are combined together to estimate the intensity of snow load in the region and it is compared with the code specified values. Also, the wide/thickness and height/thickness ratios for flange and web are evaluated according to the design codes. Three dimensional finite element model of the existing steel tribune roof is generated considering project drawings and site investigations using commercially available software ANSYS. The displacements, principal stresses and strains along to the cantilever length and column height are given as contour diagrams and graph format. In addition to site investigation, the numerical and analytical works conducted in this study indicate that the unequivocal reasons of the collapse are overloading action of snow load intensity, some mistakes made in the design of steel cantilever beams, insufficient strength and rigidity of the main structural elements, and construction workmanship errors.

Association Between Trp64arg Polymorphism of the β3 adrenoreceptor Gene and Female Sex in Obese Turkish Children and Adolescents

Resul Yılmaz,Ömer Ateş,Ali Gül,Tuba Kasap,Samet Özer,Emel Ensari 대한소아소화기영양학회 2019 Pediatric gastroenterology, hepatology & nutrition Vol.22 No.5

Purpose: The β3-adrenergic receptor (ADRB3) is expressed in visceral adipose tissue and has been speculated to contribute to lipolysis, energy metabolism, and regulation of the metabolic rate. In this study, we aimed to investigate the association of polymorphism of the ADRB3 gene with the sex of children with obesity and related pathologies. Methods: ADRB3 gene trp64arg genotyping was conducted in 441 children aged 6–18 years. Among these subjects, 264 were obese (103 boys; 161 girls) and 179 were of normal weight (81 boys; 98 girls). In the obese group, fasting lipids, glucose and insulin levels, and blood pressure were measured. Metabolic syndrome (MS) was defined according to the modified World Health Organization criteria adapted for children. Results: The frequency of trp64arg genotype was similar in obese and normal weight children. In obese children, serum lipid, glucose, and insulin levels; homeostasis model assessment of insulin resistance (HOMA-IR) scores; and MS were not different between arg allele carriers (trp64arg) and noncarriers (trp64trp). In 264 obese children, genetic analysis results revealed that the arg allele carriers were significantly higher in girls than in boys (p=0.001). In the normal weight group, no statistically significant difference was found between genotypes of boys and girls (p=0.771). Conclusion: Trp64arg polymorphism of the ADRB3 gene was not associated with obesity and MS in Turkish children and adolescents. Although no relationships were observed between the genotypes and lipids, glucose/insulin levels, or HOMA-IR, the presence of trp64arg variant was frequent in obese girls, which can lead to weight gain as well as difficulty in losing weight in women.

Camber calculation of prestressed concrete I-Girder considering geometric nonlinearity

Barbaros Atmaca,Şevket Ateş 사단법인 한국계산역학회 2017 Computers and Concrete, An International Journal Vol.19 No.1

Prestressed concrete I-girders are subject to different load types at their construction stages. At the time of strand release, i.e., detensioning, prestressed concrete girders are under the effect of dead and prestressing loads. At this stage, the camber, total net upward deflection, of prestressed girder is summation of the upward deflection due to the prestressing force and the downward deflection due to dead loads. For the calculation of the upward deflection, it is generally considered that prestressed concrete I-girder behaves linear-elastic. However, the field measurements on total net upward deflection of prestressed I-girder after detensioning show contradictory results. In this paper, camber calculations with the linear-elastic beam and elastic-stability theories are presented. One of a typical precast I-girder with 120 cm height and 31.5 m effective span length is selected as a case study. 3D finite element model (FEM) of the girder is developed by SAP2000 software, and the deflections of girder are obtained from linear and nonlinear-static analyses. Only geometric nonlinearity is taken into account. The material test and field measurement of this study are performed at prestressing girder plant. The results of the linear-elastic beam and elastic-stability theories are compared with FEM results and field measurements. It is seen that the camber predicted by elastic-stability theory gives acceptable results than the linear-elastic beam theory while strand releasing.

Alexithymia and Acne Vulgaris: A Case Control Study

Didem Sunay,Murat Baykir,Gülfem Ateş,Meral Ekşioğlu 대한신경정신의학회 2011 PSYCHIATRY INVESTIGATION Vol.8 No.4

Objective To assess relationship between alexithymia and acne vulgaris in young people. Methods A hundred and eleven subjects between 15 and 25 years of age referred to out-patient clinic of dermatology with acne and 78 subjects applied to family physician for complaints other than acne were included in patient and control groups of the study, respectively. A questionnaire to determine demographic characteristics, an acne classification to determine severity of acne and Toronto Alexithymic Scale (TAS) to assess alexithymia were used. Results The mean scores of TAS were 52.7±10.8 and 51.7±10.7 in patient and control groups, respectively. Alexitymia was determined in 23.4% of the subjects in acne group and in 24.4% of control group. No significant differences were found between groups in terms of alexithymia, intermediate alexitymia and three-factors of TAS. Conclusion Alexithymia does not appear to be related to acne vulgaris.

Combined supraclavicular and superficial cervical plexus block for clavicle surgery

Onur Baran,Bünyamin Kir,İrem Ateş,Ayhan Şahin,Ali Üztürk 대한마취통증의학회 2020 Korean Journal of Anesthesiology Vol.73 No.1

Background: Clavicle fractures occur in 35% of shoulder girdle fractures. Surgical fixation is preferred, especially in young patients for optimal functional outcomes, while nondisplaced fractures are usually treated conservatively. Case: A 38-year-old male patient was admitted to the emergency services with a fracture of the left clavicle following a fall. During the preoperative evaluation, the patient requested to be awake during the surgery. Combined supraclavicular and superficial cervical plexus block was performed under ultrasound guidance without complications and the patient experienced no pain. Conclusions: This technique may avoid possible complications related to interscalene brachial plexus block. Future studies are required to confirm the safety and efficacy of this approach.

Neuromodulation of the median nerve in carpal tunnel syndrome, a single-blind, randomized controlled study

( Gevher Rabia Genç Perdecioğlu ),( Mehlika Panpallı Ateş ),( Damla Yürük ),( Ömer Taylan Akkaya ) 대한통증학회 2024 The Korean Journal of Pain Vol.37 No.1

Background: This study aimed to evaluate the efficacy of pulsed radiofrequency applied using transcutaneous electrodes in carpal tunnel syndrome (CTS). Methods: After randomization, the patients received two cycles of noninvasive pulsed radiofrequency (NiPRF), once weekly, or splinting (the control group) for three months. Clinical evaluations were recorded at baseline and weeks 4 and 8. The Boston Carpal Tunnel Syndrome Questionnaire (BCTQ) was used to determine the functional status and symptom severity. Results: Sixty-two patients were followed up for three months. There was no difference between the groups in the BCTQ scores before and after treatment. The NiPRF group found a significant difference between the BCTQ measurements at all time intervals (paired sample t -test; P < 0.001). In the splint group, there was a significant difference only between the basal-1st month and basal-3rd month (paired samples t -test; P < 0.001). The main effect of the time variable was statistically significant (ANOVA; P < 0.001), but the group variable was not. There was no correlation between the BCTQ results measured at any time and the electroneuromyelogragphy findings in either group. Conclusions: NiPRF effectively improves symptoms and functionality in patients with CTS for up to 3 months. Thus, NiPRF can be considered an easy, safe, and useful alternative treatment modality for CTS.