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Permanent URI for this collectionhttps://hdl.handle.net/20.500.14288/3
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Publication Metadata only Emerging 3-D imaging and display technologies(Institute of Electrical and Electronics Engineers (IEEE), 2017) Javidi, Bahram; Department of Electrical and Electronics Engineering; Tekalp, Ahmet Murat; Faculty Member; Department of Electrical and Electronics Engineering; College of Engineering; 26207We have become an information-centric society vastly dependent on the collection, communication, and presentation of information. At any given moment, it is likely that we are in the vicinity of some form of a display as displays play a prominent role in a variety of devices and applications. Three-dimensional imaging and display technologies are important components for presentation and visualization of information and for creating real-world-like environments in communication. There are broad applications of 3-D imaging and display technologies in computers, communication, mobile devices, TV, video, entertainment, robotics, metrology, security and defense, healthcare, and medicine.Publication Metadata only Photonic studies on polymer-coated sapphire-spheres: a model system for biological ligands(Elsevier, 2015) Murib, M. S.; Yeap, W. S.; Martens, D.; Liu, X.; Bienstman, P.; Fahlman, M.; Schöning, M. J.; Michiels, L.; Haenen, K.; Wagner, P.; Department of Physics; Serpengüzel, Ali; Faculty Member; Department of Physics; College of Sciences; 27855In this study we show an optical biosensor concept, based on elastic light scattering from sapphire micro-spheres. Transmitted and elastic scattering intensity of the microspheres (radius 500 mu m, refractive index 1.77) on an optical fiber half coupler is analyzed at 1510 nm. The 0.43 nm angular mode spacing of the resonances is comparable to the angular mode spacing value estimated using the optical size of the microsphere. The spectral linewidths of the resonances are in the order of 0.01 am, which corresponds to quality factors of approximately 10(5). A polydopamine layer is used as a functionalizing agent on sapphire microspherical resonators in view of biosensor implementation. The varying layer thickness on the microsphere is determined as a function of the resonance wavelength shift. It is shown that polymer functionalization has a minor effect on the quality factor. This is a promising step toward the development of an optical biosensor.Publication Metadata only Transmission characteristics of metallodielectric photonic crystals and resonators(IEEE-Inst Electrical Electronics Engineers Inc, 2002) Department of Physics; Serpengüzel, Ali; Faculty Member; Department of Physics; College of Sciences; 27855K-u band Fabry-Perot type resonances have been observed in the stop band of a metallodielectric photonic crystal by transmission measurements at microwave frequencies. The metallodielectric photonic crystal has a face centered cubic Bravais lattice structure with a lattice constant of 15 mm. Metallic spheres with 6.35 mm diameter are placed at the lattice sites. The metallodielectric photonic crystal displayed a directional bandgap with a lower band edge of 13.0 GHz, an upper band edge of 21.5 GHz and a center frequency of 17.25 GHz, corresponding to a stop bandwidth center frequency ratio of 50%. The maximum rejection at the band center is 35 dB, corresponding to a 7 dB per unit cell rejection ratio. The Fabry-Perot type resonance in the K-u band has a quality factor of 200, with a maximum transmission peak of -5 dB.Publication Metadata only A deterministic analysis of an online convex mixture of experts algorithm(Institute of Electrical and Electronics Engineers (IEEE), 2015) Özkan, Hüseyin; Dönmez, Mehmet A.; N/A; Tunç, Sait; Master Student; Graduate School of Sciences and Engineering; N/AWe analyze an online learning algorithm that adaptively combines outputs of two constituent algorithms (or the experts) running in parallel to estimate an unknown desired signal. This online learning algorithm is shown to achieve and in some cases outperform the mean-square error (MSE) performance of the best constituent algorithm in the steady state. However, the MSE analysis of this algorithm in the literature uses approximations and relies on statistical models on the underlying signals. Hence, such an analysis may not be useful or valid for signals generated by various real-life systems that show high degrees of nonstationarity, limit cycles and that are even chaotic in many cases. In this brief, we produce results in an individual sequence manner. In particular, we relate the time-accumulated squared estimation error of this online algorithm at any time over any interval to the one of the optimal convex mixture of the constituent algorithms directly tuned to the underlying signal in a deterministic sense without any statistical assumptions. In this sense, our analysis provides the transient, steady-state, and tracking behavior of this algorithm in a strong sense without any approximations in the derivations or statistical assumptions on the underlying signals such that our results are guaranteed to hold. We illustrate the introduced results through examples.Publication Metadata only Special issue on 3-D media and displays(Institute of Electrical and Electronics Engineers (IEEE), 2011) Smolic, Aljoscha; Vetro, Anthony; Onural, Levent; Department of Electrical and Electronics Engineering; Tekalp, Ahmet Murat; Faculty Member; Department of Electrical and Electronics Engineering; College of Engineering; 26207This special issue provides an overview of recent advances and discusses future directions in diverse 3-D media technologies ranging from current stereoscopy to ultrarealistic holographic video, and transmission over the current and future, wired and wireless Internet.Publication Metadata only Thermo-mechanical detector array with optical readout(IEEE-Inst Electrical Electronics Engineers Inc, 2006) N/A; N/A; Department of Electrical and Electronics Engineering; Torun, Hamdi; Ferhanoğlu, Onur; Ürey, Hakan; Master Student; PhD Student; Faculty Member; Department of Electrical and Electronics Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; 205198; 8579An uncooled thermal detector array with low NETD is designed and fabricated using MEMS bimaterial structures that bend in response to thermal change. A diffraction grating placed underneath each pixel allows sensing sub-nm mechanical deflections.Publication Metadata only A moving window algorithm for 1∞ norm based blind source separation approach(European Association for Signal Processing, 2005) Department of Electrical and Electronics Engineering; Erdoğan, Alper Tunga; Faculty Member; Department of Electrical and Electronics Engineering; College of Engineering; 41624An l ∞ norm based Source Separation Method has recently been introduced [1, 2], with the corresponding subgradient based algorithm that has a simple update rule. In this article, we propose a moving window modification to this algorithm, where instead of a long fixed window, a shorter length moving window is used. The simulation results for different blind source separation setups suggest that a significant level of complexity reduction can be achieved via use of the proposed approach.Publication Metadata only Vertical resonant comb actuators for fourier transform spectroscopy(IEEE-Inst Electrical Electronics Engineers Inc, 2006) N/A; Department of Electrical and Electronics Engineering; Ataman, Çağlar; Ürey, Hakan; PhD Student; Faculty Member; Department of Electrical and Electronics Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; 8579A Fourier Transform Spectrometer is implemented with resonant mode out-of-plane comb actuators which are used as movable diffraction gratings. 106μm deflection is obtained at 28V in ambient pressure at 1.2 KHz for a 3mm clear aperture device.Publication Metadata only Multimodal data collection of human-robot humorous interactions in the JOKER project(Institute of Electrical and Electronics Engineers (IEEE), 2015) Devillers, Laurence; Rosset, Sophie; Duplessis, Guillaume Dubuisson; Sehili, Mohamed A.; Bechade, Lucile; Delaborde, Agnes; Gossart, Clement; Letard, Vincent; Yang, Fan; Yemez, Yucel; Turker, Bekir B.; Sezgin, Metin; El Haddad, Kevin; Dupont, Stephane; Luzzati, Daniel; Esteve, Yannick; Gilmartin, Emer; Campbell, Nick; Department of Computer Engineering; Department of Computer Engineering; N/A; Yemez, Yücel; Sezgin, Tevfik Metin; Türker, Bekir Berker; Faculty Member; Faculty Member; PhD Student; Department of Computer Engineering; College of Engineering; College of Engineering; Graduate School of Sciences and Engineering; 107907; 18632; N/AThanks to a remarkably great ability to show amusement and engagement, laughter is one of the most important social markers in human interactions. Laughing together can actually help to set up a positive atmosphere and favors the creation of new relationships. This paper presents a data collection of social interaction dialogs involving humor between a human participant and a robot. In this work, interaction scenarios have been designed in order to study social markers such as laughter. They have been implemented within two automatic systems developed in the JOKER project: a social dialog system using paralinguistic cues and a task-based dialog system using linguistic content. One of the major contributions of this work is to provide a context to study human laughter produced during a human-robot interaction. The collected data will be used to build a generic intelligent user interface which provides a multimodal dialog system with social communication skills including humor and other informal socially oriented behaviors. This system will emphasize the fusion of verbal and non-verbal channels for emotional and social behavior perception, interaction and generation capabilities.Publication Metadata only Scalable coding of multi-view video(N/A, 2006) Özbek, Nükhet; Department of Electrical and Electronics Engineering; Tekalp, Ahmet Murat; Faculty Member; Department of Electrical and Electronics Engineering; College of Engineering; 26207A standard for scalable video coding (SVC) is currently being worked on by the ISO MPEG Group. Work on standardization of multiple-view video coding (MVC) has also recently started under the ISO MPEG. Although there are many approaches already published on SVC and MVC, there is no current work reported on scalable multi-view video coding (SMVC). This paper presents architectures and implementations for scalable stereo and multi-view video coding, and show how combination of scalability modes, such as temporal, spatial, and SNR scalability, can be used to most efficiently encode multiple-view video at a given bandwidth.