22 results on '"Burcin Cakir"'
Search Results
2. Development of a Simulation Framework for Analyzing Security of Supply in Integrated Gas and Electric Power Systems
- Author
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Kwabena Addo Pambour, Burcin Cakir Erdener, Ricardo Bolado-Lavin, and Gerard P. J. Dijkema
- Subjects
combined simulation ,power and gas interdependence ,security of supply ,transient gas simulation ,scenario analysis ,power system contingency ,Technology ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Biology (General) ,QH301-705.5 ,Physics ,QC1-999 ,Chemistry ,QD1-999 - Abstract
Gas and power networks are tightly coupled and interact with each other due to physically interconnected facilities. In an integrated gas and power network, a contingency observed in one system may cause iterative cascading failures, resulting in network wide disruptions. Therefore, understanding the impacts of the interactions in both systems is crucial for governments, system operators, regulators and operational planners, particularly, to ensure security of supply for the overall energy system. Although simulation has been widely used in the assessment of gas systems as well as power systems, there is a significant gap in simulation models that are able to address the coupling of both systems. In this paper, a simulation framework that models and simulates the gas and power network in an integrated manner is proposed. The framework consists of a transient model for the gas system and a steady state model for the power system based on AC-Optimal Power Flow. The gas and power system model are coupled through an interface which uses the coupling equations to establish the data exchange and coordination between the individual models. The bidirectional interlink between both systems considered in this studies are the fuel gas offtake of gas fired power plants for power generation and the power supply to liquefied natural gas (LNG) terminals and electric drivers installed in gas compressor stations and underground gas storage facilities. The simulation framework is implemented into an innovative simulation tool named SAInt (Scenario Analysis Interface for Energy Systems) and the capabilities of the tool are demonstrated by performing a contingency analysis for a real world example. Results indicate how a disruption triggered in one system propagates to the other system and affects the operation of critical facilities. In addition, the studies show the importance of using transient gas models for security of supply studies instead of successions of steady state models, where the time evolution of the line pack is not captured correctly.
- Published
- 2017
- Full Text
- View/download PDF
3. A review of technical and regulatory limits for hydrogen blending in natural gas pipelines
- Author
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Erdener, Burcin Cakir, Sergi, Brian, Guerra, Omar J., Lazaro Chueca, Aurelio, Pambour, Kwabena, Brancucci, Carlo, and Hodge, Bri-Mathias
- Published
- 2023
- Full Text
- View/download PDF
4. A review of behind-the-meter solar forecasting
- Author
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Erdener, Burcin Cakir, Feng, Cong, Doubleday, Kate, Florita, Anthony, and Hodge, Bri-Mathias
- Published
- 2022
- Full Text
- View/download PDF
5. A review of technical and regulatory limits for hydrogen blending in natural gas pipelines
- Author
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Burcin Cakir Erdener, Brian Sergi, Omar J. Guerra, Aurelio Lazaro Chueca, Kwabena Pambour, Carlo Brancucci, and Bri-Mathias Hodge
- Subjects
Fuel Technology ,Renewable Energy, Sustainability and the Environment ,Energy Engineering and Power Technology ,Condensed Matter Physics - Published
- 2023
6. An integrated simulation model for analysing electricity and gas systems
- Author
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Erdener, Burcin Cakir, Pambour, Kwabena A., Lavin, Ricardo Bolado, and Dengiz, Berna
- Published
- 2014
- Full Text
- View/download PDF
7. Multi-objective optimization of a stochastic assembly line balancing: A hybrid simulated annealing algorithm.
- Author
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Burcin Cakir, Fulya Altiparmak, and Berna Dengiz
- Published
- 2011
- Full Text
- View/download PDF
8. Revealing Cluster Hierarchy in Gate-level ICs Using Block Diagrams and Cluster Estimates of Circuit Embeddings
- Author
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Sharad Malik and Burcin Cakir
- Subjects
Computer science ,Circuit design ,Block diagram ,02 engineering and technology ,Integrated circuit ,Parallel computing ,01 natural sciences ,Computer Graphics and Computer-Aided Design ,020202 computer hardware & architecture ,Computer Science Applications ,law.invention ,010104 statistics & probability ,law ,0202 electrical engineering, electronic engineering, information engineering ,Netlist ,OpenSPARC ,Node (circuits) ,0101 mathematics ,Electrical and Electronic Engineering ,Cluster analysis ,Network analysis - Abstract
Contemporary integrated circuits (ICs) are increasingly being constructed using intellectual property blocks (IPs) obtained from third parties in a globalized supply chain. The increased vulnerability to adversarial changes during this untrusted supply chain raises concerns about the integrity of the end product. The difference in the levels of abstraction between the initial specification and the final available circuit design poses a challenge for analyzing the final circuit for malicious insertions. Reverse engineering presents one way to help reduce the difficulty of circuit analysis and inspection. In this work, we provide a framework that given (i) a gate-level netlist of a design and (ii) a block diagram for the design with relative sizes of the blocks, outputs a matching between the partitions of the circuit and blocks in the block diagram. We first compute a geometric embedding for each node in the circuit and then apply a clustering algorithm on the embedding features to obtain circuit partitions. Each partition is then mapped to the high-level blocks in the block diagram. These partitions can then be further analyzed for malicious insertions with much reduced complexity in comparison with the full chip. We tested our algorithm on different designs with varying sizes to evaluate the efficacy of algorithm, including the open-source processor OpenSparc T1, and showed that we can successfully match over 90% of gates to their corresponding blocks.
- Published
- 2019
9. A review of behind-the-meter solar forecasting
- Author
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Burcin Cakir Erdener, Cong Feng, Kate Doubleday, Anthony Florita, and Bri-Mathias Hodge
- Subjects
Renewable Energy, Sustainability and the Environment - Published
- 2022
10. Reverse Engineering Digital ICs through Geometric Embedding of Circuit Graphs
- Author
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Burcin Cakir and Sharad Malik
- Subjects
Reverse engineering ,Computer science ,Reference design ,0102 computer and information sciences ,02 engineering and technology ,Integrated circuit ,computer.software_genre ,01 natural sciences ,Computer Graphics and Computer-Aided Design ,020202 computer hardware & architecture ,Computer Science Applications ,law.invention ,Computer engineering ,010201 computation theory & mathematics ,law ,Block (programming) ,Hardware_INTEGRATEDCIRCUITS ,0202 electrical engineering, electronic engineering, information engineering ,Netlist ,OpenSPARC ,Electrical and Electronic Engineering ,Reference model ,computer ,Electronic circuit - Abstract
Outsourcing of design and manufacturing processes makes integrated circuits (ICs) vulnerable to adversarial changes and raises concerns about their integrity. Reverse engineering the manufactured netlist helps identify malicious insertions. In this article, we present an automated approach that, given a reference design description with high-level blocks, infers these blocks in an untrusted gate-level (test) implementation. Using the graph connectivity of the netlists, we compute a geometric embedding for each wire in the circuits, which, then, is used to compute a bipartite matching between the nodes of the two designs and identify high-level blocks in the test circuit. Experiments to evaluate the efficacy of the proposed technique on various-sized designs, including the multi-core processor OpenSparc T1, show that it can correctly match over 90% of gates in the test circuit to their corresponding block in the reference model.
- Published
- 2018
11. SAInt – A novel quasi-dynamic model for assessing security of supply in coupled gas and electricity transmission networks
- Author
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Burcin Cakir Erdener, Ricardo Bolado-Lavin, Gerhard P.J. Dijkema, and Kwabena Addo Pambour
- Subjects
Engineering ,020209 energy ,02 engineering and technology ,010501 environmental sciences ,Management, Monitoring, Policy and Law ,01 natural sciences ,Electric power system ,Fuel gas ,0202 electrical engineering, electronic engineering, information engineering ,Dispatchable generation ,Simulation ,0105 earth and related environmental sciences ,Power transmission ,Combined power gas simulation ,Transient hydraulic gas simulation ,business.industry ,Mechanical Engineering ,Control engineering ,Building and Construction ,Renewable energy ,Security of supply ,General Energy ,Electricity generation ,Electric power transmission ,AC-optimal power flow ,Contingency analysis ,Electric power ,business ,Power gas interdependence - Abstract
The integration of renewable energy sources into existing electric power systems is connected with an increased interdependence between natural gas and electricity transmission networks. To analyse this interdependence and its impact on security of supply, we developed a novel quasi-dynamic simulation model and implemented it into the simulation tool SAInt (Scenario Analysis Interface for Energy Systems), the first published software application that allows the combined simulation of gas and electric power systems in a single time frame and simulation environment. The model is composed of a transient hydraulic simulation model for the gas system and an augmented AC-Optimal Power Flow model for the electric power system, which includes a model for dispatchable power system loads and considers time transitional constraints, such as the ramp rate and the start-up time of generation units. Both models take into account the control and constraints of the most relevant facilities present in both systems. The bidirectional interconnection between both systems is considered and established by coupling equations describing the fuel gas offtake for power generation in gas fired power plants, and the electric power supply to LNG terminals and electric driven compressors in gas compressor stations. The resulting system of equations for the combined model are solved in a single simulation time frame. In order to quantify the impact of different contingencies on the operation of the combined system, a number of security of supply parameters are proposed, which can be utilised to compare the impact of different contingencies on security of supply and the effectiveness of countermeasures to mitigate this impact. The capabilities of the combined model and the functionality of the simulation tool SAInt are demonstrated in a case study of a sample gas and power transmission system. Results indicate how the combined simulation of gas and electric power systems can give insight into important and critical information, such as the timing and propagation of contingencies cascading from one system to the other or the grace period to react to these contingencies. Such information can contribute to improving the coordination between gas and power transmission system operators in the event of a disruption, thus, increasing the resilience and the level of security of supply in the combined energy system. The information provided by the combined model cannot be obtained by the traditional co-simulation approach, where both systems are solved in different time frames. Furthermore, the studies stress the importance of using transient gas simulation models for security of supply analysis instead of steady state models, where the time evolution of gas pressure and linepack are not reflected appropriately.
- Published
- 2017
12. Gendering the Empire
- Author
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Burcin Cakir
- Subjects
Politics ,New Woman ,media_common.quotation_subject ,Political science ,Empire ,Gender studies ,Ideology ,Citizenship ,Backwardness ,Feminism ,Nationalism ,media_common - Abstract
This chapter traces the development of Victorian gender norms, notably the notion of the “New Woman,” the rise of feminist arguments, and the development of gendered citizenship in relation to nationalism in imperial Britain and how it inspired a similar discourse in the Ottoman Empire beginning from the second half of the 19th century to the end of the World War I. In the Victorian imperial ideology, women were responsible for the moral upbringing of their children and for providing a moral haven for their husbands. Women were taken into the center of a discourse that created a gendered representation for the defenders of various political ideologies to offer solutions to the weakening Europe. Women’s status began to be treated as the measure of Empire’s progress and/or backwardness. The government’s major goal in founding these schools was not to train and educate women for the labor market but to make them intellectual and entertaining wives and better mothers.
- Published
- 2018
13. 'Sons of Two Empires': The Idea of Nationhood in Anzac and Turkish Poems of the Gallipoli Campaign
- Author
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Berkan Ulu and Burcin Cakir
- Subjects
Embryology ,History ,Turkish ,media_common.quotation_subject ,Victory ,Ancient history ,lcsh:PR1-9680 ,Politics ,The Gallipoli Campaign ,media_common ,lcsh:English language ,Poetry ,Anzacs ,Nationhood ,Empire ,Cell Biology ,language.human_language ,lcsh:English literature ,Turks ,British Empire ,National identity ,Close reading ,language ,lcsh:PE1-3729 ,Anatomy ,Filología Inglesa ,Developmental Biology - Abstract
An unexpected failure of the Allied forces and a monumental victory for the Turks, the Gallipoli Campaign (1915) is thought to be the first notable experience for Australians and New Zealanders on their way to identify themselves as nations free from the British Empire. For the war-weary Turks, too, the victory in Gallipoli was the beginning of their transformation from a wreck of an empire to a modern republic. Despite the existence of a substantial body of research on the military, political, and historical aspects of the campaign, studies on the literature of Gallipoli are very few and often deal with canonised poets such as Rupert Brooke or national concerns through a single perspective. Aiming to bring to light underappreciated poets from Gallipoli, this paper is a comparative study of less known poems in English and Turkish from Gallipoli. While doing this, the study traces the signs of the nation-building processes of Australia, New Zealand, and Turkey with emphasis on national identity. To this end, the paper examines a number of Gallipoli poems in English and Turkish that were composed by combatant or non-combatant poets by using close reading analysis in search of shifts in discourse and tone. The study also underlines how poets from the two sides identified themselves and the ways the campaign is reflected in these poems. At length, the study shows that Gallipoli poems display similar attitudes towards the idea of belonging to an empire although they differ in the way warfare is perceived. With emphasis on less known poems and as one of the very few comparative studies of the poetry of the Gallipoli Campaign, this paper will contribute to the current research into the legacy and literature of the First World War.
- Published
- 2018
14. The First World War and its aftermath: the shaping of the Middle East
- Author
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Burcin Cakir
- Subjects
History ,Middle East ,Political science ,Ancient history ,First world war - Published
- 2018
15. An integrated simulation tool for analyzing the Operation and Interdependency of Natural Gas and Electric Power Systems
- Author
-
Pambour, Kwabena Addo, Erdener, Burcin Cakir, Bolado-Lavin, Ricardo, Dijkema, Gerhard, and Energy and Sustainability Research Institute Groni
- Abstract
In this paper, we present an integrated simulation tool for analyzing the interdependency of natural gas and electric power systems in terms of security of energy supply. In the first part, we develop mathematical models for the individual systems. In part two, we identify the interconnections between both systems and propose a method for coupling the combined simulation model. Next, we develop the algorithm for solving the combined system and integrate this algorithm into a simulation software. Finally, we demonstrate the value of the software in a case study on a real world interconnected gas and electric power system of an European region. This paper was prepared for presentation at the PSIG Annual Meeting held in Vancouver, British Columbia, 11 May - 13 May 2016.
- Published
- 2016
16. Development of a Simulation Framework for Analyzing Security of Supply in Integrated Gas and Electric Power Systems
- Author
-
Gerard P.J. Dijkema, Kwabena Addo Pambour, Burcin Cakir Erdener, Ricardo Bolado-Lavin, and Energy and Sustainability Research Institute Groni
- Subjects
Engineering ,power and gas interdependence ,Computer science ,020209 energy ,02 engineering and technology ,security of supply ,lcsh:Technology ,Automotive engineering ,lcsh:Chemistry ,Electric power system ,Fuel gas ,0202 electrical engineering, electronic engineering, information engineering ,General Materials Science ,lcsh:QH301-705.5 ,energy_fuel_technology ,combined simulation ,transient gas simulation ,scenario analysis ,power system contingency ,Instrumentation ,Simulation ,Fluid Flow and Transfer Processes ,lcsh:T ,business.industry ,Process Chemistry and Technology ,020208 electrical & electronic engineering ,General Engineering ,lcsh:QC1-999 ,Cascading failure ,Computer Science Applications ,Power (physics) ,Electricity generation ,lcsh:Biology (General) ,lcsh:QD1-999 ,lcsh:TA1-2040 ,Transient (oscillation) ,lcsh:Engineering (General). Civil engineering (General) ,business ,Gas compressor ,lcsh:Physics ,Liquefied natural gas - Abstract
Gas and power networks are tightly coupled and interact with each other due to physically interconnected facilities. In an integrated gas and power network, a contingency observed in one system may cause iterative cascading failures, resulting in network wide disruptions. Therefore, understanding the impacts of the interactions in both systems is crucial for governments, system operators, regulators and operational planners, particularly, to ensure security of supply for the overall energy system. Although simulation has been widely used in the assessment of gas systems as well as power systems, there is a significant gap in simulation models that are able to address the coupling of both systems. In this paper, a simulation framework that models and simulates the gas and power network in an integrated manner is proposed. The framework consists of a transient model for the gas system and a steady state model for the power system based on AC-Optimal Power Flow. The gas and power system model are coupled through an interface which uses the coupling equations to establish the data exchange and coordination between the individual models. The bidirectional interlink between both systems considered in this studies are the fuel gas offtake of gas fired power plants for power generation and the power supply to liquefied natural gas (LNG) terminals and electric drivers installed in gas compressor stations and underground gas storage facilities. The simulation framework is implemented into an innovative simulation tool named SAInt (Scenario Analysis Interface for Energy Systems) and the capabilities of the tool are demonstrated by performing a contingency analysis for a real world example. Results indicate how a disruption triggered in one system propagates to the other system and affects the operation of critical facilities. In addition, the studies show the importance of using transient gas models for security of supply studies instead of successions of steady state models, where the time evolution of the line pack is not captured correctly.
- Published
- 2017
17. An Integrated Simulation Model For Analysing Electricity And Gas Systems
- Author
-
Burcin Cakir Erdener, Kwabena Addo Pambour, Berna Dengiz, and Ricardo Bolado Lavin
- Subjects
Engineering ,Dependency (UML) ,Operations research ,Electricity transmission network ,business.industry ,media_common.quotation_subject ,Energy Engineering and Power Technology ,Integrated modelling ,Energy security ,Industrial engineering ,Gas transmission network ,Power (physics) ,Interdependence ,Natural gas ,Simulation model ,Energy supply ,Electricity ,Electrical and Electronic Engineering ,business ,Gas compressor ,media_common - Abstract
This paper aims at analysing the impacts of interdependencies between electricity and natural gas systems in terms of security of energy supply. When analysing both systems several interdependencies can be observed, however, the most significant interdependencies are as follows: (1) gas dependency of gas fired power plants in electricity system and (2) electric dependency of electric-driven compressors in gas system. Since both systems depend on each other, it is of major interest from an energy security perspective to investigate how failures triggered in either of the systems propagate from one system to the other. We proposed an integrated simulation model that aims at reflecting the dynamics of the systems in case of disruptions and takes the cascading effects of these disruptions into account. While developing the integrated model, first electricity and gas systems are modelled separately and then linked by an (MATLAB-based) interface. The effectiveness of the proposed model is investigated using characteristic disruption scenarios. Computational results demonstrate that the integrated simulation model is very user-friendly and quite effective and efficient in analysing the interactions between electricity and gas systems., JRC.F.3-Energy security
- Published
- 2014
18. Development of a Simulation Framework for Analyzing Security of Supply in Integrated Gas and Electric Power Systems.
- Author
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Pambour, Kwabena Addo, Erdener, Burcin Cakir, Bolado-Lavin, Ricardo, and Dijkema, Gerard P. J.
- Subjects
INTEGRATED gasification combined cycle power plants ,ELECTRIC power ,GAS compressors ,MATHEMATICAL models - Abstract
Gas and power networks are tightly coupled and interact with each other due to physically interconnected facilities. In an integrated gas and power network, a contingency observed in one system may cause iterative cascading failures, resulting in network wide disruptions. Therefore, understanding the impacts of the interactions in both systems is crucial for governments, system operators, regulators and operational planners, particularly, to ensure security of supply for the overall energy system. Although simulation has been widely used in the assessment of gas systems as well as power systems, there is a significant gap in simulation models that are able to address the coupling of both systems. In this paper, a simulation framework that models and simulates the gas and power network in an integrated manner is proposed. The framework consists of a transient model for the gas system and a steady state model for the power system based on AC-Optimal Power Flow. The gas and power system model are coupled through an interface which uses the coupling equations to establish the data exchange and coordination between the individual models. The bidirectional interlink between both systems considered in this studies are the fuel gas offtake of gas fired power plants for power generation and the power supply to liquefied natural gas (LNG) terminals and electric drivers installed in gas compressor stations and underground gas storage facilities. The simulation framework is implemented into an innovative simulation tool named SAInt (Scenario Analysis Interface for Energy Systems) and the capabilities of the tool are demonstrated by performing a contingency analysis for a real world example. Results indicate how a disruption triggered in one system propagates to the other system and affects the operation of critical facilities. In addition, the studies show the importance of using transient gas models for security of supply studies instead of successions of steady state models, where the time evolution of the line pack is not captured correctly. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
19. The effect of amblyopia on clinical outcomes of children with astigmatism
- Author
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Burçin Çakır, Nilgün Özkan Aksoy, Sedat Özmen, and Özlem Bursalı
- Subjects
Ophthalmology ,RE1-994 - Abstract
Background: Amblyopia is more common in children with high astigmatism, but factors contributing to development of amblyopia and visual outcomes are not fully understood. Objective: To evaluate the effect of amblyopia on the clinical outcomes in children with ⩾1.75 diopter (D) astigmatism. Methods: We reviewed the medical records of children with ⩾1.75 D astigmatism with and without amblyopia (amblyopes group and non-amblyopes group). The mean age, gender, amount and type of ocular deviation, presence of convergence insufficiency (CI), stereopsis, time of initial spectacle use and follow-up time, differences in best-corrected visual acuity (VoD) and spherical equivalent (SE) between eyes were assessed and compared between the groups. Best-corrected visual acuity (BCVA), mean SE, astigmatism measurements were assessed and compared between amblyopic, fellow, and non-amblyopic eyes. Results: The records included 68 eyes of 34 children with amblyopia and 56 eyes of 28 children without amblyopia. The mean age, gender, amount and type of ocular deviation, presence of CI, stereopsis, time of initial spectacle use, follow-up time, and the difference in SE did not differ between groups. In amblyopes, exodeviation was more common and statistically greater in near (33 cm) than at distance (6 m) (p = 0.005). The mean BCVA and astigmatism values were statistically different between amblyopic, fellow, and non-amblyopic eyes. Conclusion: A greater near than distance exodeviation and higher mean astigmatism value were found in amblyopic children with astigmatism.
- Published
- 2021
- Full Text
- View/download PDF
20. Does pterygium morphology affect corneal astigmatism?
- Author
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Emine Doğan, Burçin Çakır, Nilgün Aksoy, Elif Köse, and Gürsoy Alagöz
- Subjects
Ophthalmology ,RE1-994 - Abstract
Purpose: The purpose of this study was to evaluate the correlation between corneal astigmatism and the morphology of pterygium with anterior segment optic coherence tomography (AS-OCT). Material and Methods: The size of pterygium (horizontal length, vertical width) was measured manually; pterygium area and percentage extension of the pterygium onto the cornea were calculated. Anterior and posterior corneal astigmatism, Sim K, K1, K2 were measured using a dual Scheimpflug analyzer. Morphological patterns of the pterygium analyzed with AS-OCT were determined according to the extension of the pterygium apex below the corneal epithelium. Two tomographic patterns were identified: continuous and nodular. Correlation between anterior corneal astigmatism and pterygium size, percentage extension of the pterygium, and morphological pattern of the pterygium was analyzed. Results: The mean ages of the 47 patients were 49.4 ± 16.6 (22–80) years. Mean horizontal pterygium length, vertical width, pterygium area, and percentage extension of the pterygium were 2.8 ± 1.2 mm, 4.8 ± 1.6 mm, 7.42 ± 5.6 mm 2 and 24.5 ± 10.4%, respectively. Mean anterior corneal astigmatism was 2.3 ± 2.3 D and simulated keratometry was 43.4 ± 2.02 D. In terms of the morphological pattern of the pterygium, 24 eyes had continuous, 23 eyes had a nodular pattern and the median (interquartile range) anterior corneal astigmatism was 1.87 (1.01–3.80) and 1.22 D (0.58–2.35), respectively ( p = 0.102). Other topographic and pterygium size parameters were similar between groups. Analyzing the correlations in groups separately, a positive moderate statistically significant correlation was present between vertical width, percentage extension, pterygium area, and anterior corneal astigmatism in both continuous and nodular groups. Conclusions: Although not statistically significant, anterior corneal astigmatism was higher in continuous group. Using AS-OCT to standardize the morphology of pterygium could provide additional clinical information.
- Published
- 2021
- Full Text
- View/download PDF
21. Evaluation of Anterior Segment Parameters in Pseudoexfoliative Glaucoma, Primary Angle-Closure Glaucoma, and Healthy Eyes
- Author
-
Nilgün Özkan Aksoy, Burçin Çakır, Emine Doğan, and Gürsoy Alagöz
- Subjects
Objectives: To evaluate anterior segment parameters measured by dual Scheimpflug corneal topography in pseudoexfoliative glaucoma (PEXG) ,primary angle-closure glaucoma (PACG) ,and healthy eyes. Materials and Methods: One hundred forty-three eyes of 86 patients were included in this study. Forty-seven eyes of 38 patients with PEXG ,30 eyes of 15 patients with PACG ,and 66 eyes of 33 healthy subjects were evaluated. Patients who underwent previous ophthalmic surgery and contact lens wearers were excluded. After full ophthalmological examination ,mean central corneal thickness (CCT) ,white-to-white horizontal corneal diameter (WTW) ,pupillary diameter (PD) ,anterior chamber volume (ACV) ,anterior chamber depth (ACD) ,0%2E05%29%2E+There+were+also+no+statistical+differences+in+CCT%22">and mean anterior chamber angle were measured by dual Scheimpflug corneal topography and compared between the three groups. Statistical analyses were done using Statistical Package for Social Sciences for Windows 18.0 program. Results: No statistical difference was found in mean age or gender among the study groups (p>0.05). There were also no statistical differences in CCT ,WTW ,or PD among the groups (p=0.568 ,p=0.064 ,p=0.321 ,respectively). ACV ,ACD ,Pseudoexfoliative glaucoma ,primary angle-closure glaucoma ,dual Scheimpflug topography system ,Medicine ,Ophthalmology ,RE1-994 - Abstract
Objectives: To evaluate anterior segment parameters measured by dual Scheimpflug corneal topography in pseudoexfoliative glaucoma (PEXG), primary angle-closure glaucoma (PACG), and healthy eyes. Materials and Methods: One hundred forty-three eyes of 86 patients were included in this study. Forty-seven eyes of 38 patients with PEXG, 30 eyes of 15 patients with PACG, and 66 eyes of 33 healthy subjects were evaluated. Patients who underwent previous ophthalmic surgery and contact lens wearers were excluded. After full ophthalmological examination, mean central corneal thickness (CCT), white-to-white horizontal corneal diameter (WTW), pupillary diameter (PD), anterior chamber volume (ACV), anterior chamber depth (ACD), and mean anterior chamber angle were measured by dual Scheimpflug corneal topography and compared between the three groups. Statistical analyses were done using Statistical Package for Social Sciences for Windows 18.0 program. Results: No statistical difference was found in mean age or gender among the study groups (p>0.05). There were also no statistical differences in CCT, WTW, or PD among the groups (p=0.568, p=0.064, p=0.321, respectively). ACV, ACD, and mean anterior chamber angle values were significantly lower in the PACG group compared to the other groups (p=0.000 for all). There was no statistically significant difference in these measurements between the PEXG and normal eyes. Conclusion: ACV and depth and mean anterior chamber angle were statistically different (lower) in PACG when compared with PEXG and healthy eyes. Dual Scheimpflug corneal topography can be used as an objective method for the measurement of anterior segment parameters in glaucoma.
- Published
- 2018
- Full Text
- View/download PDF
22. Comparison of Deviation Types Among Astigmatic Children With Or Without Amblyopia
- Author
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Burçin Çakır, Burcin Cakir, FICO
- Published
- 2020
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