Browsing Bilgisayar Mühendisliği Bölümü by Author "Özdoğan, Cem"

Now showing items 1-20 of 20

About nanometer sized analogues of basic electronic and optical components

Quandt, Alexander; Özdoğan, Cem; Ferrari, Maurizio; Speranza, Giorgio (IEEE, 2008)

We discuss a downsizing of optical components into the nanometer range. It presupposes the substitution of photons by ballistic electrons, but it also requires a simple and robust concept to assemble the analogues of basic ...
An investigation of hydrogen bonded neutral B4Hn (n=1-11) and anionic B4H11(-1) clusters: Density functional study

Böyükata, Mustafa; Özdoğan, Cem; Güvenç, Ziya B. (Elsevier Science, 2007-03-28)

In this study, detailed analysis of the structural stability of hydrogen bonded four-atom boron clusters within the framework of density functional theory (DFT) is presented. Effects of the number of hydrogen atoms on the ...
Boron doped graphene nanostructures

Quandt, Alexander; Özdoğan, Cem; Kuntsmann, Jens; Fehske, Holger (Wiley-Blackwell, 2008-10)

We present results from an ab initio study of metallized semiconducting graphene nanostructures. Our model system consists of an alternating chain of quasi-planar B(7) clusters embedded into a semiconducting arm-chair ...
Density functional study of physical and chemical properties of nano size Boron Clusters: B-n (n=13-20)

Atış, Murat; Özdoğan, Cem; Güvenç, Büşra (Chinese Physical Soc, 2009-08)

Boron is an element that has ability to build strong and highly directional bonds with boron itself. As a result, boron atoms form diverse structural motifs, ultimately can yield distinct nano structures, such as planar, ...
Effects of hydrogen hosting on cage structures of boron clusters: density functional study of B(m)H(n) (m=5-10 and n <= m) complexes

Böyükata, Mustafa; Özdoğan, Cem; Güvenç, Ziya B. (IOP Publishing Ltd, 2008-02)

The structural stability of hydrogen bonded boron microclusters has been studied by using the density functional theory. Effects of the increasing number of hydrogen atoms on the cage geometries of B(5)-B(10) clusters, and ...
Feynman, biominerals and graphene - basic aspects of nanoscience

Quandt, Alexander; Özdoğan, Cem (Elsevier Science Bv, 2010-06)

This article is about writing small. Inspired by R.P. Feynman's legendary talk There's plenty of room at the bottom, we recapitulate his famous Gedanken experiment of condensing a lot of useful information on the head of ...
(Formula Presented) Algorithms In Tight-Binding Molecular-Dynamics Simulations of the Electronic Structure of Carbon Nanotubes

Dereli, Gülay; Özdoğan, Cem (Physical Review B - Condensed Matter and Materials Physics, 2003)

The (formula presented) and parallelization techniques have been successfully applied in tight-binding molecular-dynamics simulations of single-walled carbon nanotubes (SWNT’s) of various chiralities. The accuracy of the ...
Functionalizing graphene by embedded boron clusters

Quandt, Alexander; Özdoğan, Cem; Kunstmann, Jens; Fehske, Holger (IOP Publishing LTD, 2008-08-20)

We present a model system that might serve as a blueprint for the controlled layout of graphene based nanodevices. The systems consists of chains of B-7 clusters implanted in a graphene matrix, where the boron clusters are ...
Localization of metallicity and magnetic properties of graphene and of graphene nanoribbons doped with boron clusters

Özdoğan, Cem; Kunstmann, Jens; Quandt, A (Taylor&Francis INC, 2014)

As a possible way of modifying the intrinsic properties of graphene, we study the doping of graphene by embedded boron clusters with density functional theory. Cluster doping is technologically relevant as the cluster ...
Molecular dynamics simulation of sintering and surfacepremelting of silver nanoparticles

Alarifi, Hani; Atış, Murat; Özdoğan, Cem; Hu, A.; Yavuz, M.; Zhou, Y. (Japan Inst Metals, 2013-06)

Sintering of Ag nanoparticles (NPs) is increasingly being used as a driving mechanism for joining in the microelectronics industry. We therefore performed molecular dynamics simulations based on the embedded atom method ...
O(N) algorithms in tight-binding molecular-dynamics simulations of the electronic structure of carbon nanotubes

Dereli, G.; Özdoğan, Cem (2003)

A (formula presented) single-walled carbon nanotube consisting of 400 atoms with 20 layers is simulated under tensile loading using our developed (formula presented) parallel tight-binding molecular-dynamics algorithms. ...
Parallel WaveCluster: A linear scaling parallel clustering algorithm implementation with application to very large datasets

Yıldırım, Ahmet Artu; Özdoğan, Cem (Academic Press Inc Elsevier Science, 2011-07)

A linear scaling parallel clustering algorithm implementation and its application to very large datasets for cluster analysis is reported. WaveCluster is a novel clustering approach based on wavelet transforms. Despite ...
Parallel wavelet-based clustering algorithm on GPUs using CUDA

Yıldırım, Ahmet Artu; Özdoğan, Cem (Elsevier Science, 2011)

There has been a substantial interest in scientific and engineering computing community to speed up the CPU-intensive tasks on graphical processing units (GPUs) with the development of many-core GPUs as having very large ...
Parallelization of a molecular dynamics simulation of an ion-surface collision

Atış, Murat; Özdoğan, Cem; Güvenç, Ziya B. (World Scientific Publ CO PTE LTD, 2005-06)

Parallel molecular dynamics simulation study of the ion-surface collision system is reported. A sequential molecular dynamics simulation program is converted into a parallel code utilizing the concept of parallel virtual ...
Structural stability and energetics of single-walled carbon nanotubes under uniaxial strain

Dereli, G.; Özdoğan, Cem (2003-01-15)

A (10x10) single-walled carbon nanotube consisting of 400 atoms with 20 layers is simulated under tensile loading using our developed O(N) parallel tight-binding molecular-dynamics algorithms. It is observed that the ...
Structure and energetic of Bn (n 2–12) clusters: electronic structure calculations

Atış, Murat; Özdoğan, Cem; Güvenç, Ziya B. (Wiley-Blackwell, 2007-03-05)

The electronic and geometric structures, total and binding energies, first and second energy differences, harmonic frequencies, point symmetries, and highest occupied molecular orbital–lowest unoccupied molecular orbital ...
Surface modification by 1 keV ion impact: molecular dynamics study of an Ar+-Ni(100) collision system

Özdoğan, Cem; Atış, Murat; Güvenç, Büşra (IOP Publishing LTD, 2008-04)

An Ar+-Ni(1 0 0) collision system at 1 keV impact energy was investigated by using realistic isoenergetic molecular dynamics (MD) simulations. The sputtering process upon Ar+ ion impact and damage to the Ni(1 0 0) surface ...
Surface modification by 1 keV ion impact: molecular dynamics study of an Ar+-Ni(100) collision system

Özdoğan, Cem; Atis, Murat; Güvenç, Ziya B. (2008-04)

An Ar+-Ni(1 0 0) collision system at 1 keV impact energy was investigated by using realistic isoenergetic molecular dynamics (MD) simulations. The sputtering process upon Ar+ ion impact and damage to the Ni(1 0 0) surface ...
The unusually stable B-100 fullerene, structural transitions in boron nanostructures, and a comparative study of alpha- and gamma-boron and sheets

Özdoğan, Cem; Mukhopadhyay, Saikat; Hayami, W.; Güvenç, Büşra; Pandey, Ravindra; Boustani, Ihsan (Amer Chemical Soc, 2010-03-18)

Solid alpha-B-12 rhombohedral and gamma-B-28 orthorhombic boron as well as boron nanostructures in the form of spheres, sheets, and multirings beside a ring consisting of icosahedral B-12 units were investigated using ab ...
Thermal stability of metallic single-walled carbon nanotubes: an O(N) tight-binding molecular dynamics simulation study

Dereli, Gülay; Süngü Mısıroğlu, Banu; Özdoğan, Cem (IOP Publishing ltd, 2007-01-20)

Order(N) tight-binding molecular dynamics (TBMD) simulations are performed to investigate the thermal stability of ( 10, 10) metallic single-walled carbon nanotubes (SWCNTs). Periodic boundary conditions (PBCs) are applied ...

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Browsing Bilgisayar Mühendisliği Bölümü by Author "Özdoğan, Cem"

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