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73 documents, page 1 of 8

Practical implementation and performance study of a hard-switched hybrid FSO/RF link under controlled fog environment

Lee, I. E.; Ghassemlooy, Z.; Ng, W. P.; Gourdel, V.; Khalighi, M. A.; Zvanovec, S.; Uysal, Murat (2014)
Due to copyright restrictions, the access to the full text of this article is only available via subscription. The availability and performance of terrestrial free-space optical (FSO) communication systems are heavily deterred by the fluctuating conditions of the atmospheric channel, particularly in the presence of visibility-limiting fog effects. In this paper, we examine the viability of deploying hybrid FSO and radio frequency (RF) links through an experimental study, which takes advant...

Learning to grasp with parental scaffolding

Ugur, E.; Celikkanat, H.; Şahin, E.; Nagai, Y.; Öztop, Erhan (2011)
Due to copyright restrictions, the access to the full text of this article is only available via subscription. Parental scaffolding is an important mechanism utilized by infants during their development. Infants, for example, pay stronger attention to the features of objects highlighted by parents and learn the way of manipulating an object while being supported by parents. In this paper, a robot with the basic ability of reaching for an object, closing fingers and lifting its hand lacks k...

Yüksek-ölçekli mobil iletişim verilerinin açık-kaynak hadoop çerçevesi kullanılarak paralel ve iş-hatlı işlenmesi

Koca, M.; Arı, İsmail; Koçak, U.; Çalıkuş, O.; Sezgin, C. (2012)
Due to copyright restrictions, the access to the full text of this article is only available via subscription. The fast increase in mobile device and bandwidth usage is generating big workloads on the IT infrastructures of mobile service providers and increasing management costs. These providers collect log files continuously and use these logs for billing, operational and marketing purposes. In this paper, we describe the design, implementation and efficient parallel processing of large-s...

Multi-hop coherent free-space optical communications over atmospheric turbulence channels

Aghajanzadeh, S. M.; Uysal, Murat (2011)
Projects: EC | FOCUS (268318)
Due to copyright restrictions, the access to the full text of this article is only available via subscription. In this paper, we investigate multi-hop relaying as an efficient fading mitigation tool for coherent free-space optical (FSO) systems over atmospheric turbulence channels. We consider an FSO relaying system with decode-and-forward relay nodes and multiple heterodyne receivers with modal compensation. Based on a recently introduced statistical characterization for the combined effe...

Spectral tuning of near-field radiative heat flux between two thin silicon carbide films

Francoeur, M.; Mengüç, M. Pınar; Vaillon, R. (2010)
Projects: EC | NF-RAD (239382)
Due to copyright restrictions, the access to the full text of this article is only available via subscription. Spectral distributions of radiative heat flux between two thin silicon carbide films separated by sub-wavelength distances in vacuum are analysed. An analytical expression for the near-field flux between two layers of finite thicknesses in terms of film reflection and transmission coefficients is derived for the first time. The resulting equation clearly shows the resonant modes o...

Coupling of near-field thermal radiative heating and phonon Monte Carlo simulation: Assessment of temperature gradient in n-doped silicon thin film

Wong, B. T.; Francoeur, M.; Bong, V. N.-S.; Mengüç, M. Pınar (2014)
Projects: EC | NF-RAD (239382)
Due to copyright restrictions, the access to the full text of this article is only available via subscription. Near-field thermal radiative exchange between two objects is typically more effective than the far-field thermal radiative exchange as the heat flux can increase up to several orders higher in magnitudes due to tunneling of evanescent waves. Such an interesting phenomenon has started to gain its popularity in nanotechnology, especially in nano-gap thermophotovoltaic systems and ne...

Integrated engineering and architecture for the energy efficient academic buildings

Mengüç, M. Pınar; Somuncu, Yasemin; Çağlayan, Ş.; Özcan, S.; Sefer, B.; Simitli, U. (2015)
Projects: EC | NEED4B (285173)
In this paper, we outline a comprehensive and integrated collaboration between engineering and architecture team to build an energy efficient building. Within the framework of the EU FP7 project, titled NEED4B, we have been instrumental in design, construction and operation of a new highly energy efficient education building in the campus of Özyeğin University in Istanbul. The building was completed in 2013 although its monitoring will continue until 2018 to evaluate the performances of all s...

Assessments on the improved modelling for pneumatic artificial muscle actuators

Peternel, L.; Uğurlu, Barkan; Babic, J.; Morimoto, J. (2015)
Projects: EC | CODYCO (600716)
Due to copyright restrictions, the access to the full text of this article is only available via subscription. In this paper, we present an analysis regarding the pneumatic air muscle modelling, with a particular emphasis on the exoskeleton robot control. We propose two calibration approaches for obtaining the model identification data. We used the measurement data acquired from the proposed approaches to identify different mathematical models of pneumatic muscles. These models specified t...

Characterization of nano-scale protective oxide films: application on metal chemical mechanical planarization

Karagöz, A.; Craciun, V.; Başım, Gül Bahar (2015)
Projects: EC | NANO-PROX (256348)
This study focuses on the characterization of nano-scale metal oxide films for chemical mechanical planarization (CMP) applications. The protective nature of the self-grown metal oxide layers in the CMP slurry environment enable topographic selectivity required for metallization of interconnects. Tungsten was selected as the model metal film to study the formation and characteristics of the metal oxide nano-layers since tungsten CMP is very well-established in conventional semiconductor manuf...

Near-field thermal radiation transfer by mesoporous metamaterials

Didari, A.; Mengüç, M. Pınar (2015)
Projects: EC | NF-RAD (239382)
In this work, we investigate the impact of nano-scale pores within structured metamaterials on spectral near-field radiative transfer. We use Finite Difference Time Domain Method (FDTD) and consider uniform and corrugated SiC substrates filled with rectangular nano-scale vacuum inclusions having equivalent diameters of 10, 37 and 57 nm. We report the appearance of the secondary and tertiary resonance peaks at different frequencies as a function of changing pore diameter, which cannot be predi...
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