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Results for "Talha Ongun"
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High-performance planar nanoscale dielectric capacitorsMay 30 2015We propose a model for planar nanoscale dielectric capacitor consisting of a single layer, insulating hexagonal boron nitride (BN) stripe placed between two metallic graphene stripes, all forming commensurately a single atomic plane. First-principles ... More Interactive Function Computation via Polar CodingMay 05 2014Oct 31 2015In a series of papers N. Ma and P. Ishwar (2011-13) considered a range of distributed source coding problems that arise in the context of iterative computation of functions, characterizing the region of achievable communication rates. We consider the ... More Stable single-layer honeycomb like structure of silicaJun 10 2014Silica or SiO$_2$, the main constituent of earth's rocks has several 3D complex crystalline and amorphous phases, but it does not have a graphite like layered structure in 3D. Our theoretical analysis and numerical calculations from the first-principles ... More Local Reconstructions of Silicene Induced by AdatomsNov 26 2013The interaction of silicene with Si, C, H, O, Ti atoms along with H$_2$, H$_2$O and O$_2$ molecules are investigated and the induced functionalities thereof are analyzed using first principles density functional theory. Si adatom initially adsorbed at ... More New Phases of GermaneneJul 15 2014Germanene, a graphene like single layer structure of Ge, has been shown to be stable and recently grown on Pt and Au substrates. We show that a Ge adatom adsorbed to germanene pushes down the host Ge atom underneath and forms a dumbbell structure. This ... More Epitaxial growth mechanisms of graphene and effects of substratesFeb 27 2012Jun 26 2012The growth process of single layer graphene with and without substrate is investigated using ab initio, finite temperature molecular dynamic calculations within density functional theory. An understanding of the epitaxial graphene growth mechanisms in ... More The Maximum Traveling Salesman Problem with Submodular RewardsSep 17 2012Sep 24 2012In this paper, we look at the problem of finding the tour of maximum reward on an undirected graph where the reward is a submodular function, that has a curvature of $\kappa$, of the edges in the tour. This problem is known to be NP-hard. We analyze two ... More Approximation Algorithms for Max-Morse MatchingApr 16 2016Apr 22 2016In this paper, we prove that the Max-Morse Matching Problem is approximable, thus resolving an open problem posed by Joswig and Pfetsch. We describe two different approximation algorithms for the Max-Morse Matching Problem. For $D$-dimensional simplicial ... More Dissociative Adsorption of Molecules on Graphene and SiliceneOct 31 2014We study the interaction of H$_2$, O$_2$, CO, H$_2$O and OH molecules with the vacancy defects of graphene and silicene. Atoms around the bare vacancy reconstruct and specific chemically active sites are created. While H$_2$, O$_2$ and CO remain intact ... More Wirelessly Powered Communication Networks with Short PacketsOct 24 2016Wirelessly powered communications will entail short packets due to naturally small payloads, low-latency requirements and/or insufficient energy resources to support longer transmissions. In this paper, a wirelessly powered communication system is investigated ... More Millimeter Wave Energy HarvestingSep 05 2015Apr 09 2016The millimeter wave (mmWave) band, which is a prime candidate for 5G cellular networks, seems attractive for wireless energy harvesting. This is because it will feature large antenna arrays as well as extremely dense base station (BS) deployments. The ... More On Wirelessly Powered Communications with Short PacketsSep 16 2016Wireless-powered communications will entail short packets due to naturally small payloads, low latency requirements and/or insufficient energy resources to support longer transmissions. In this paper, a wireless-powered communication system is investigated ... More Silicite: the layered allotrope of siliconJul 30 2014Based on first-principles calculation we predict two new thermodynamically stable layered-phases of silicon, named as silicites, which exhibit strong directionality in the electronic and structural properties. As compared to silicon crystal, they have ... More Wirelessly Powered Communication Networks with Short PacketsOct 24 2016Nov 01 2016Wirelessly powered communications will entail short packets due to naturally small payloads, low-latency requirements and/or insufficient energy resources to support longer transmissions. In this paper, a wirelessly powered communication system is investigated ... More Towards a Cybernetic Foundation for Natural Resource GovernanceMar 20 2018This study explores the potential of the cybernetic method of inquiry for the problem of natural resource governance. The systems way of thinking has already enabled scientists to gain considerable headway in framing global environmental challenges. On ... More Millimeter Wave Energy HarvestingSep 05 2015Mar 11 2017The millimeter wave (mmWave) band, which is a prime candidate for 5G cellular networks, seems attractive for wireless energy harvesting. This is because it will feature large antenna arrays as well as extremely dense base station (BS) deployments. The ... More Stability and Sustainability of Resource Consumption NetworksJan 10 2019In this paper, we examine both stability and sustainability of a network-based model of natural resource consumption. Stability is studied from a dynamical systems perspective, though we argue that sustainability is a fundamentally different notion from ... More Tunable colloidal photonic crystalsAug 19 2018Aug 22 2018Spherical colloids arranged in a crystalline order are known to produce structural colors. The intensity and brilliance of such photonic crystals require high size-monodispersity of the colloids, a low number of lattice defects and disorder, as well as ... More Infrared fingerprints of few-layer black phosphorusJul 27 2016Feb 05 2017Black phosphorus is an infrared layered material. Its bandgap complements other widely studied two-dimensional materials: zero-gap graphene and visible/near-infrared gap transition metal dichalcogenides. Though highly desirable, a comprehensive infrared ... More Generative Adversarial Network for Medical Images (MI-GAN)Oct 01 2018Deep learning algorithms produces state-of-the-art results for different machine learning and computer vision tasks. To perform well on a given task, these algorithms require large dataset for training. However, deep learning algorithms lack generalization ... More Leveraging Unlabeled Whole-Slide-Images for Mitosis DetectionJul 31 2018Mitosis count is an important biomarker for prognosis of various cancers. At present, pathologists typically perform manual counting on a few selected regions of interest in breast whole-slide-images (WSIs) of patient biopsies. This task is very time-consuming, ... More Inducing transparency in the films of highly scattering particlesJun 29 2018Today colloids are employed in various products from creams and coatings to electronics. The ability to control their chemical, optical, or electronic features by controlling their size and shape explains why these materials are so widely employed. Nevertheless, ... More Stability of Leaderless Resource Consumption NetworksApr 11 2018In this paper, we study the global stability properties of a multi-agent model of natural resource consumption that balances ecological and social network components in determining the consumption behavior of a group of agents. The social network is assumed ... More