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| 2. |
- Özkan, Emre, et al.
(author)
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Online EM algorithm for joint state and mixture measurement noise estimation
- 2012
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In: 15th International Conference on Information Fusion (FUSION), 2012. - : IEEE. - 9781467304177 - 9780982443842 ; , s. 1935-1940
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Conference paper (peer-reviewed)abstract
- In this study, we aim to estimate the unknown multi-modal measurement noise distribution of nonlinear state space models. The unknown noise distribution is modeled as a mixture of exponential family of distributions. We use the Expectation-Maximization (EM) method in order to jointly estimate the unknown parameters as well as the states. The online version of the EM algorithm is implemented by using particle filtering techniques. The resulting algorithm is a noise adaptive particle filter which is applicable to many sensor models having multi-modal noise distributions with unknown parameters.
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| 3. |
- Gråsjö, Urban, 1962-, et al.
(author)
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- 2014
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In: Knowledge, Innovation and Space. - : Edward Elgar Publishing. - 9781848449015 ; , s. 51-79
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Book chapter (peer-reviewed)
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| 4. |
- Aad, G., et al.
(author)
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- 2015
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Journal article (peer-reviewed)
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| 5. |
- Aad, G., et al.
(author)
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- 2011
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swepub:Mat__t (peer-reviewed)
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| 6. |
- Özgünoglu, Mehmet, 1989
(author)
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Numerical Analysis of Cavitation-Induced Erosion in High-Pressure Fuel Injectors: under static and dynamic lift conditions
- 2024
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Licentiate thesis (other academic/artistic)abstract
- Fuel injection systems are crucial for all modern combustion engines. These systems often operate under very high pressures to ensure fast spray breakup for optimal fuel air mixing leading to efficient combustion in order to meet strict emission standards. However, this high-pressure environment, combined with complicated geometries, can lead to sudden velocity and pressure changes within the fuel injector, making it susceptible to cavitation – a phenomenon where local pressure drops below the vapor pressure and the liquid fuel suddenly evaporates. Cavitation-induced erosion in fuel injectors affects combustion efficiency and system durability, presenting a challenge for analysis. This study explores the numerical assessment of cavitation-induced erosion in high-pressure fuel injectors using computational fluid dynamics (CFD). Reynolds-averaged Navier-Stokes (RANS) and Large Eddy Simulation (LES) are employed with specific sub-models. Cavitation is modeled using the mixture transport of modified Zwart-Gerber-Belamri approach. The investigation starts with low and high lift static needle positions, comparing the results with experimental data to gain insight into erosion behaviour in an industrial heavy duty injector. To examine the effect of the surface deviations to erosion patterns, static high lift condition is modeled with CAD and Tomography Scan separately. Finally, the effect of the needle motion is carried out by implementing “wobbling” and “lift only” motion profiles using RANS.
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| 7. |
- Özgür, Erdogan, et al.
(author)
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Bioinspired design of a polymer-based biohybrid sensor interface
- 2017
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In: Sensors and actuators. B, Chemical. - : Elsevier BV. - 0925-4005 .- 1873-3077. ; 251, s. 674-682
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Journal article (peer-reviewed)abstract
- The key step in the construction of efficient and selective analytical separations or sensors is the design of the recognition interface. Biomimicry of the recognition features typically found in biological molecules, using amino acids, peptides and nucleic acids, provides plausible opportunities to integrate biological molecules or their active sites into a synthetic polymeric backbone. Given the basic role of functional amino acids in biorecognition, we focused on the synthesis of polymerizable amino acid derivatives and their incorporation into a polymer-based biohybrid interface to construct generic bioinspired analytical tools. We also utilized polyvinyl alcohol (PVA) as a sacrificial polymer to adjust the porosity of these biohybrid interfaces. The surface morphologies of the interfaces on gold electrodes were characterized by using scanning electron (SEM) and atomic force (AFM) microscopies. The electrochemical behavior of the polymeric films was systematically investigated using differential pulse voltammetry (DPV) to demonstrate the high affinity of the biohybrid interfaces for Cu(II) ions. The presence of macropores also significantly improved the recognition performance of the interfaces while enhancing interactions between the target [Cu(II) ions] and the functional groups. As a final step, we showed the applicability of the proposed analytical platform to create a Cu(II) ion-mediated supramolecular self-assembly on a quartz crystal microbalance (QCM) electrode surface in real time.
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| 8. |
- Özkirimli, Umut
(author)
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Nationalism
- 2019
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In: Oxford Bibliographies.
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Journal article (peer-reviewed)
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| 9. |
- Aad, G., et al.
(author)
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- 2014
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In: The European Physical Journal C. - : Springer Science and Business Media LLC. - 1434-6052. ; 74:10
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Journal article (peer-reviewed)
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| 10. |
- Özgümüs, Türküler, et al.
(author)
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Starvation to Glucose Reprograms Development of Neurovascular Unit in Embryonic Retinal Cells
- 2021
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In: Frontiers in Cell and Developmental Biology. - : Frontiers Media SA. - 2296-634X. ; 9, s. 1-11
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Journal article (peer-reviewed)abstract
- Perinatal exposure to starvation is a risk factor for development of severe retinopathy in adult patients with diabetes. However, the underlying mechanisms are not completely understood. In the present study, we shed light on molecular consequences of exposure to short-time glucose starvation on the transcriptome profile of mouse embryonic retinal cells. We found a profound downregulation of genes regulating development of retinal neurons, which was accompanied by reduced expression of genes encoding for glycolytic enzymes and glutamatergic signaling. At the same time, glial and vascular markers were upregulated, mimicking the diabetes-associated increase of angiogenesis-a hallmark of pathogenic features in diabetic retinopathy. Energy deprivation as a consequence of starvation to glucose seems to be compensated by upregulation of genes involved in fatty acid elongation. Results from the present study demonstrate that short-term glucose deprivation during early fetal life differentially alters expression of metabolism- and function-related genes and could have detrimental and lasting effects on gene expression in the retinal neurons, glial cells, and vascular elements and thus potentially disrupting gene regulatory networks essential for the formation of the retinal neurovascular unit. Abnormal developmental programming during retinogenesis may serve as a trigger of reactive gliosis, accelerated neurodegeneration, and increased vascularization, which may promote development of severe retinopathy in patients with diabetes later in life.
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