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752 results on '"Sevgi, Levent"'

13. IEEE Access ™ Editorial Board

Author

Adapa, Ram, primary, Annaswamy, Anuradha, additional, Ansari, Nirwan, additional, Cai, Jun, additional, Capmany, Jose, additional, Chen, Kun-Shan, additional, Chiao, J.-C., additional, Deen, M. Jamal, additional, Evans, John W., additional, Fattah, Shaikh, additional, Ganz, Aura, additional, Ghosh, Amitava, additional, Goldgof, Dmitry, additional, Guerrero, Josep M., additional, Hodkiewicz, Melinda, additional, Jamalipour, Abbas, additional, Jiang, Weihua, additional, Karam, Lina, additional, Kaynak, Okyay, additional, Laskar, Joy, additional, Lazzi, Gianluca, additional, Leung, Victor C. M., additional, Li, Shengtao, additional, Liang, Qilian, additional, Lu, Jian-Yu, additional, Lunardi, Leda, additional, Pecht, Michael, additional, Peng, Mugen, additional, Proenca, Hugo, additional, Qian, Yi, additional, Qu, Zhihua, additional, Saif, Mehrdad, additional, Serpenguzel, Ali, additional, Sevgi, Levent, additional, Trebi-Ollennu, Ashitey, additional, Tsang, Leung, additional, Wang, Ge, additional, Weisshaar, Andreas, additional, and Zio, Enrico, additional

Published
2021
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14. Some characteristics of radiation from linearly phased/sequentially excited periodic, rectangular arrays of dipoles

Author

Uluisik, Cagatay, Topuz, Ercan, and Sevgi, Levent

Subjects
Dipole antennas -- Properties, Electric waves -- Properties, Electromagnetic radiation -- Properties, Electromagnetic waves -- Properties, Business, Computers, Electronics, Electronics and electrical industries
Abstract

Floquet wave and element-by-element summation representations are implemented to investigate the radiation from a periodic, rectangular array of linearly phased/sequentially pulsed dipoles in the frequency-and time-domains. A synthetic aperture type formulation for Floquet wave representation and an asymptotic formulation for the element-by-element summation representation are developed. Numerical results are presented to demonstrate the efficiency of the Floquet wave representation in terms of radiating, non-radiating and diffracted wave constituents and then validated via comparison with direct summation over the contributions of individual dipole radiations. Index Terms--Floquet waves, frequency- and time-domain Green's functions, periodic arrays, phased array antennas, Poisson summation, synthetic aperture, tip diffracted waves.

Published
2008

15. Groundwave modeling and simulation strategies and path loss prediction virtual tools

Author

Sevgi, Levent

Subjects
Time-domain analysis -- Usage, Electric waves -- Analysis, Electromagnetic radiation -- Analysis, Electromagnetic waves -- Analysis, Wave propagation -- Analysis, Electromagnetic waves -- Scattering, Business, Computers, Electronics, Electronics and electrical industries
Abstract

Reliable and accurate groundwave propagation path loss prediction between a pair of transmitter/receiver necessitates a good understanding of electromagnetic wave scattering in the presence of non-flat terrain and inhomogeneous atmosphere, and this is one of the major issues in radio communication and radar systems design. A propagation engineer desires to have a numerical propagator that calculates the radiowave path loss, without going into details and/or having a deep knowledge of the propagation phenomena, between any two points specified on a digital map of the area of interest. Since a generally applicable, all-purpose propagation prediction method has not developed yet one has to understand validity and accuracy ranges, and the limitations of available prediction models and tools; this certainly requires, to some extent, the physical insight of the propagation problem at hand. This article aims to summarize groundwave propagation modeling and numerical simulation strategies, and to review some of the virtual tools, introduced recently. Index Terms--Analytical methods, atmospheric refractivity effects, electromagnetic wave propagation, finite-difference time-domain (FDTD), groundwaves, Matlab, method of moments (MoM), mixed-path propagation, non-flat terrain modeling, numerical methods, numerical simulator, parabolic equation method, ray-mode approximations, short pulse propagation, split-step PE (SSPE), surface impedance, surface waves, transmission line matrix (TLM), virtual tools, wave scattering.

Published
2007

18. Electromagnetic Diffraction Modeling and Simulation with MATLAB

Author

Apaydin, Gokhan, Sevgi, Levent, Apaydin, Gokhan, and Sevgi, Levent

Subjects
Electromagnetic fields--Mathematical models
Abstract

This exciting new resource presents a comprehensive introduction to the fundamentals of diffraction of two-dimensional canonical structures, including wedge, strip, and triangular cylinder with different boundary conditions. Maxwell equations are discussed, along with wave equation and scattered, diffracted and fringe fields. Geometric optics, as well as the geometric theory of diffraction are explained. With MATLAB scripts included for several well-known electromagnetic diffraction problems, this book discusses diffraction fundamentals of two-dimensional structures with different boundary conditions and analytical numerical methods that are used to show diffraction.

Published
2021

21. A Practical Guide to EMC Engineering

Author

Sevgi, Levent

Subjects
A Practical Guide to EMC Engineering (Nonfiction work) -- Sevgi, Levent, Books -- Book reviews, Library and information science, Publishing industry
Abstract

A Practical Guide to EMC Engineering Levent Sevgi Artech House 685 Canton Street, Norwood, MA 02062 9781630813833, $159.00, www.artechhouse.com A Practical Guide to EMC Engineering explores the basics of EMC [...]

Published
2017

23. First and second order mur type ABCs for DNG media

Author

Pekmezci, Ayşegül, Topuz, Ercan, Sevgi, Levent, Doğuş Üniversitesi, Mühendislik Fakültesi, Elektronik ve Haberleşme Mühendisliği Bölümü, TR148039, TR143820, TR143819, Pekmezci, Ayşegül, and Topuz, Ercan

Subjects
Absorbing Boundary Conditions, MUR, Finite Difference Time Domain (FDTD), Double Negative Media, Lorentz Model, One-Way Wave Equation
Abstract

Pekmezci, Ayşegül (Dogus Author) -- Topuz, Ercan (Dogus Author) Reflections from boundaries of the FDTD computational domain lead to inaccurate, even unstable codes when dealing with problems involving double negative (DNG) materials. Here, an efficient and simple algorithm is presented for terminating FDTD in DNG medium which is based on first and second order Mur’s absorbing boundary conditions (ABC). FDTD update equations for Mur’s ABC formulations are obtained from frequency domain one-way wave equations using piecewise linear recursive convolution (PLRC) method. Numerical examples are given both for 1D and 2D scenarios to demonstrate the validity and stability of the proposed Mur formulations, and its advantages over uniaxial perfectly matched layer (UPML) in reducing computational time and memory requirements.

Published
2018

28. A Practical Guide to EMC Engineering

Author

Sevgi, Levent and Sevgi, Levent

Subjects
Electromagnetic compatibility
Abstract

This practical new resource explores the fundamentals of EMC engineering and examines the concepts and underpinnings of electromagnetics. This book highlights the procedures from design to market for both technical and non-technical issues, including market control, accreditation, calibration, EMC tests and measurement, and EMC protection. Basic electrical engineering theories, Maxwell equations, EM scattering, diffraction and propagation in the electromagnetic model are presented. The circuit model, including lumped parameter circuit elements, two-port circuit definitions, grounding, common and differential model currents, and microstripline circuits are explored. This book also covers antennas and antenna calibration, including communication antennas, normalized site attenuation (NSA), loop antennas, and loop antenna calibration (LAC). Noise and frequency analysis on fundamental electromagnetic signals, noise, and transforms is explained. Readers find insight into EMC test and measurement environments and devices. Time-saving MATLAB code is included in this resource to help engineers with their projects in the field.

Published
2017

33. Accreditation

Author

Sevgi, Levent

Abstract

Öz bulunamadı.

Published
2017

34. Circuit Model

Author

Sevgi, Levent

Abstract

Öz bulunamadı.

Published
2017

38. EMC/EMI problems and diffraction modeling: Finite difference time domain vs. method of moments

Author

Uslu, Mehmet Alper, Apaydın, Gökhan, Sevgi, Levent, Doğuş Üniversitesi, Mühendislik Fakültesi, Elektronik ve Haberleşme Mühendisliği Bölümü, Uslu, Mehmet Alper, and Sevgi, Levent

Subjects
High Frequency Asymtotics, MoM, Finite Difference Time Domain, Wedge, Diffraction, Method of Moments
Abstract

Uslu, Mehmet Alper (Dogus Author) -- Sevgi, Levent (Dogus Author) -- Conference full title: 2014 International Symposium on Electromagnetic CompatibiIity, EMC 2014; Hitotsubashi Hall (National Center of Sciences)Tokyo; Japan; 12 May 2014 through 16 May 2014. Edge and/or tip diffraction has long been investigated. Early attempts were analytical and called High Frequency Asymptotics (HFA). With the use of computers, numerical approaches have also appeared. In this study, two powerful numerical models, Method of Moments (MoM) and Finite Difference Time Domain (FDTD), are used in diffraction modeling on the canonical wedge scattering problem. IEEE Antennas and Propagation Society

Published
2014

42. Method of moments (MoM) modeling of wave propagation inside a wedge waveguide

Author

Apaydın, Gökhan, Sevgi, Levent, Işık Üniversitesi, Mühendislik Fakültesi, Elektrik-Elektronik Mühendisliği Bölümü, Işık University, Faculty of Engineering, Department of Electrical-Electronics Engineering, and Sevgi, Levent

Subjects
Modeling, Green's function, Environments, Wedge, Boundaries, Canonical test, Scattering, Representations, Electromagnetic propagation, Normal modes, Adiabatic modes, Waveguide, Guided waves, Intrinsic modes, Transverse variation, Visualizations, Method of Moments (MoM), Simulation
Abstract

Method of Moments (MoM) is used to model guided wave propagation inside a non-penetrable wedge waveguide and the results are validated against analytical mode-based exact solutions. Publisher's Version

Published
2014

43. Modeling and Simulation Concepts in Engineering Education: Virtual Tools

Author

Sevgi, Levent, Doğuş Üniversitesi, Mühendislik Fakültesi, Elektronik ve Haberleşme Mühendisliği Bölümü, TR143819, and Sevgi, Levent

Subjects
Eğitim, Sanal Makine Sistemi, Virtual Machine System, Modeling, Modelleme, Turk. J. Elec. Eng. & Comp. Sci.,14,(2006),113-127. Full text: pdf Other articles published in the same issue: Turk. J. Elec. Eng. & Comp. Sci.,vol.14,iss.1, Mühendislik Eğitimi, Benzetim, Engineering Education, Elektrik Mühendisliği, Electrical Engineering, Simulation, Education
Abstract

This article reviews fundamental concepts of modeling and simulation in computational sciences, such as a model, analytical- and numerical-based modeling, simulation, validation, verification, etc., in relation to the virtual labs widely-offered as parts of engineering education. Virtual tools that can be used in electromagnetic engineering are also introduced.

Published
2014

44. Speaking with Numbers: Scientific Literacy and Public Understanding of Science

Author

Sevgi, Levent, Doğuş Üniversitesi, Mühendislik Fakültesi, Elektronik ve Haberleşme Mühendisliği Bölümü, TR143819, and Sevgi, Levent

Subjects
Eğitim, Engineering, Science Education, Bilim ve Teknoloji, Fen Eğitimi, Mühendislik, ComputingMilieux_COMPUTERSANDEDUCATION, Turk. J. Elec. Eng. & Comp. Sci.,14,(2006),33-40. Full text: pdf Other articles published in the same issue: Turk. J. Elec. Eng. & Comp. Sci.,vol.14,iss.1, Science and Technology, Management Engineering, İşletme Mühendisliği, Education
Abstract

Public understanding of science and scientific literacy is discussed. Scientific method, scientific process and scientific filter are reviewed accordingly. Basic terms of measurement and numerical calculation are outlined. Finally, fundamental requirements of scientific literacy and critical response skills are presented.

Published
2014

45. Finite-difference time-domain (FDTD) MATLAB codes for first-and second-order em differential equations

Author

Toroğlu, Gizem, Sevgi, Levent, Doğuş Üniversitesi, Mühendislik Fakültesi, Elektronik ve Haberleşme Mühendisliği Bölümü, TR102537, TR143819, Toroğlu, Gizem, and Sevgi, Levent

Subjects
MATLAB, Transverse Magnetic, Maxwell Equations, FDTD, Absorbing Boundary Conditions, Metamaterials, Wave Equation, Finite-Difference Time-Domain, TM, MTM, MUR Conditions, Transverse Electric, TE
Abstract

A set of two-dimensional (2D) electromagnetic (EM) MATLAB codes, using both first-order coupled differential (Maxwell) equations and second-order decoupled (wave) equations, are developed for both transverse-magnetic (TM) and transverse-electric (TE) polarizations. Second-order MUR type absorbing boundary conditions are used to simulate free space. Metamaterial (MTM) modeling is also included. Performance tests in terms of computational times, memory requirements, and accuracies were done for simple EM scenarios with magnetic field, current, and voltage comparisons. The codes may be used for teaching and research purposes. IEEE Antennas and Propagation Society

Published
2014

46. DigiComm: a MATLAB - based digital communication system simulator

Author

Uluışık, Çağatay, Sevgi, Levent, Doğuş Üniversitesi, Mühendislik Fakültesi, Elektronik ve Haberleşme Mühendisliği Bölümü, TR31212, TR143819, Uluışık, Çağatay, and Sevgi, Levent

Subjects
Modulation, MATLAB, Graphical User Interface (GUI), Signalto - Noise Ratio (SNR), Data_CODINGANDINFORMATIONTHEORY, Noise, Frequency Division Multiple Access (FDMA), Frequency Shift Keying (FSK), Simulation, Computer Science::Information Theory, Digital Communication System, Visualization, Bit Error Rate (BER)
Abstract

A simple digital communication virtual tool, DigiComm, is introduced. This tool visualizes the transmission of binary data in different channels using frequency-shift keying (FSK) and accessing the shared media via frequency-division multiple access (FDMA). The transmitter part generates binary data, and modulates the frequencies of both carriers of each channel. The signals of each channel with noise added are distinguished from each other using bandpass filters (BPF) at the receiver, and converted to binary data by counting the zero crossings at the receiver part. Signals at the transmitter and receiver can be displayed in the time or frequency domains. Bit-error rates (BER) are calculated for a given signal-to-noise ratio (SNR) by comparing the received bits with the transmitted bits. IEEE Antennas and Propagation Society

Published
2014

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