Elektronik ve Haberleşme Mühendisliği Bölümü Yayın Koleksiyonu
Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/260
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Article Citation - WoS: 22Citation - Scopus: 21Structure and Reactivity of Nin (n=7-14, 19) Clusters(Wiley, 2001) Böyükata, M; Güvenç, ZB; Özçelik, S; Durmus, P; Jellinek, JResults of a computer simulation study of Ni-n (n = 7-14, 19) clusters, their structures, energetics, and reactivity with a D-2 molecule are presented. The clusters are described by an embedded atom potential, whereas the interaction between the molecule and the clusters is modeled by an LEPS (London-Eyring-Polanyi-Sato) potential energy function. The focus is on structures of the dusters and their reactive channels. The total numbers of stable isomers of the clusters are obtained by sampling their phase space, and the isomers' energy spectra are determined. On the reactive side, dissociative chemisorptions cross sections and decay-rate constants are calculated. (C) 2001 John Wiley & Sons, Inc.Article Citation - WoS: 7Citation - Scopus: 7Scattering Theory of Waves by a Perfectly Conducting Half-Screen Between Two Different Media(Wiley, 2015) Umul, Yusuf ZiyaThe scattering process of electromagnetic waves by a half-plane, located at the interface of two media with different dielectric constants, play an important role in the remote sensing applications and wireless technology for wave propagation over land-sea transition. In this article, the diffracted fields are obtained for such geometry with the aid of a physical optics-based method. A scattering integral is constructed for both of the media. The diffracted fields are obtained by the edge point technique and the constants, which were added to the diffraction coefficients, were evaluated from the continuity conditions across the transition of the two mediums. The uniform expressions of the diffracted waves are obtained and the results are investigated numerically. (c) 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1928-1933, 2015Article Citation - WoS: 17Citation - Scopus: 22Turbo Product Codes Based on Convolutional Codes(Wiley, 2006) Yilmaz, Ali Ozgur; Gazi, OrhanIn this article, we introduce a new class of product codes based on convolutional codes, called convolutional product codes. The structure of product codes enables parallel decoding, which can significantly increase decoder speed in practice. The use of convolutional codes in a product code setting makes it possible to use the vast knowledge base for convolutional codes as well as their flexibility in fast parallel decoders. Just as in turbo codes, interleaving turns out to be critical for the performance of convolutional product codes. The practical decoding advantages over serially-concatenated convolutional codes are emphasized.Article Citation - WoS: 53Citation - Scopus: 61Structure and Energetic of Bn (n=2-12) Clusters: Electronic Structure Calculations(Wiley, 2007) Oezdogan, Cem; Guevenc, Ziya B.; Atis, Murat; Özdoǧan, Cen; Güvenç, Ziya B.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 (HOMO-LUMO) gaps of small and neutral B-n (n = 2-12) clusters have been investigated using density functional theory (DFT), B3LYP with 6-311 + + G(d,p) basis set. Linear, planar, convex, quasi-planar, three-dimensional (3D) cage, and open-cage structures have been found. None of the lowest energy structures and their isomers has an inner atom; i.e., all the atoms are positioned at the surface. Within this size range, the planar and quasi-planar (convex) structures have the lowest energies. The first and the second energy differences are used to obtain the most stable sizes. A simple growth path is also discussed with the studied sizes and isomers. The results have been compared with previously available theoretical and experimental works. (C) 2006 Wiley Periodicals, Inc.