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Mekatronik Mühendisliği Bölümü Yayın Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/255

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Browsing Mekatronik Mühendisliği Bölümü Yayın Koleksiyonu by Department "Çankaya Üniversitesi, Mühendislik Fakültesi, Mekatronik Mühendisliği Bölümü"

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    Article
    Citation Count: Alsaka, Dina Yaqoob; Arpali, Caglar; Arpali, Serap Altay, "A comparison of iterative Fourier transform algorithms for image quality estimation", Optical Review, Vol. 25, No. 5, pp. 625-637, (2018)
    A Comparison of Iterative Fourier Transform Algorithms for Image Quality Estimation
    (Optical Soc Japan, 2018) Alsaka, Dina Yaqoob; Arpalı, Çağlar; Altay Arpalı, Serap; 20809
    A comparison was established between two iterative Fourier transform algorithms (IFTAs), such as the original Gerchberg-Saxton (GS) and the mixed-region amplitude freedom (MRAF) algorithms, for the hologram reconstruction of different target images through the full reference image quality estimation (IQE) and pixel homogeneity in the Fourier plane presented theoretically and experimentally. The comparison was applied depending upon both algorithms based on a computer-generated hologram (CGH) implemented utilizing a reflective phase-modulated liquid-crystal spatial light modulator (LC-SLM) to obtain the digital kinoform holograms of the desired intensity distributions. These digital holograms were applied to reconstruct the intensity patterns for 852 nm, which represents a laser beam source. The theoretical and experimental results of the reconstructed patterns obtained using the MRAF algorithm were found to be smoother and better than the patterns obtained using the GS algorithm. Unmodulated light beam (dc term) is removed from the reconstructed patterns attributed to digital kinoform holograms of MRAF algorithm as an alternative to the theoretical and experimental results without using any additional optic equipment at the light path. Moreover, this paper discussed the full reference objective quality estimations, such as mean square error (MSE), peak signal-to-noise ratio (PSNR), structural content (SC), normalized absolute error (NAE), normalized cross correlation (NK), and homogeneity of pixels, through the contrast (Cont) and inverse difference moment (IDM) for numerical and experimental results. According to the two desired intensity distributions processed theoretically and experimentally, the results of MRAF algorithm were found to be in the highly accurate recovered phase, the quality of image was enhanced, and the dc term was decreased. Image quality estimation of full reference objective relay on the feedback algorithms experimental attestation has not been implemented yet.
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    Article
    Citation Count: Hazir, O.; Shtub, A. "Effects of the information presentation format on project control", Journal of the Operational Research Society, Vol. 62, No. 12, pp. 2157-2161, (2012)
    Effects of the Information Presentation Format On Project Control
    (Taylor&Francis LTD, 2011) Hazır, Öncü; Shtub, A.
    In this paper, we investigate the relationship between the information presentation format and project control. Furthermore, the effects of some system conditions, namely the number of projects to be controlled and the level of time pressure, on the quality of the project control decisions are analyzed. Information provided by Earned Value Analysis is used to monitor and control projects, and simulation is applied to replicate and model the uncertain project environments. Software is developed to generate random cost figures, to present the data in different visual forms and to collect users' responses. Having performed the experiments, the statistical significance of the results is tested. Journal of the Operational Research Society (2011) 62, 2157-2161. doi: 10.1057/jors.2011.11 Published online 2 March 2011
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    Article
    Citation Count: Gjergjizi, Belma...et al. (2018). "SERS-based ultrafast and sensitive detection of luteinizing hormone in human serum using a passive microchip", Sensors and Actuators B-Chemical, Vol. 269, pp. 314-321.
    SERS-Based Ultrafast and Sensitive Detection of Luteinizing Hormone In Human Serum Using A Passive Microchip
    (Elsevier Science SA, 2018) Gjergjizi, Belma; Çoğun, Ferah; Yıldırım, Ender; Eryılmaz, Merve; Selbes, Yeşim; Sağlam, Necdet; Tamer, Uğur; 3837
    Human luteinizing hormone (LH) is an important analyte for doping control analysis since it increases the athletic performance. However, traditional methods to detect LH have few disadvantages, such as long analysis duration, waste disposal problem and sample matrix effect. Addressing these problems, surface enhanced Raman spectroscopy based LH analysis using a passive microfluidic chip was developed and optimized. Antibody modified magnetic gold nanoparticles captured the LH and then, 4-aminothiophenol (4-ATP) labeled nanoparticles formed the sandwich immunoassay structure. The complex and the other reactions occurred in different chambers of the chip. The SERS signals of 4-ATP were recorded from the chamber and the system was shown to detect 0.036 IU L-1 in serum samples. The performance of the immunoassay was compared to all other methods and the proposed assay was the fastest analysis of LH without any problems associated with the sensitivity. The shorter analysis time was recorded because the chip enables the control of all reactions in one place and there was no requirement of a specialized laboratory. (c) 2018 Elsevier B.V. All rights reserved.