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Bulunan: 14 Adet 0.025 sn
Yayın Dili : en ✕Yazar/lar : AÇIKGÖZ, Hulusi ✕
Koleksiyon [3]
İlgili Araştırmacılar [16]
Ambargo Durumu [1]
Tam Metin [2]
Yayın Türü [2]
Yazar/lar [19]
Atıf Dizini [3]
Konu Başlıkları [3]
Yayıncı [9]
Yayın Tarihi [5]
Yayın Dili [1]
Erişime Açık

An approach based on ANFIS and input selection procedure for microwave characterization of dielectric materials

SADOU, Hakim | HACIB, Tarik | AÇIKGÖZ, Hulusi | LE BIHAN, Yan | MEYER, Olivier | MEKIDECHE, Mohamed Rachid

Purpose: The principle of microwave characterization of dielectric materials using open-ended coaxial line probe is to link the dielectric properties of the sample under test to the measurements of the probe admittance (Y(f) = G(f)+ jB(f)). The purpose of this paper is to develop an alternative inversion tool able to predict the evolution of the complex permittivity (ε = ε′ – jε″) on a broad band frequency (f from 1 MHz to 1.8 GHz). Design/methodology/approach: The inverse problem is solved using adaptive network based fuzzy inference system (ANFIS) which needs the creation of a database for i ...Daha fazlası

Makale 2018 Emerald Group Publishing Ltd. 6 Görüntülenme
Erişime Açık

Microwave coaxial antenna for cancer treatment: Reducing the backward heating using a double choke

AÇIKGÖZ, Hulusi | MITTRA, Raj

In this paper, we focus on the so-called backward heating problem, which appears when coaxial-type antennas are used to treat certain types of cancers. The aim of this study is to reduce the surface currents propagating along the outer conductor of the antenna that lead to a higher Specific Absorption Rate (SAR) and overheat the healthy tissues. Our study shows that the use of a double-choke can lead to a lower SAR compared to the case of a single one. We also demonstrate that the use of a periodic structure does not help to further improve the SAR-level along the antenna. © 2015 The Institute ...Daha fazlası

Konferans Bildirisi 2016 Institute of Electrical and Electronics Engineers Inc. 6 Görüntülenme
Erişime Açık

Electromagnetic Acoustic Transducer for cracks detection in conductive material

BOUGHEDDA, Houssem | HACIB, Tarik | CHELABI, Mohamed | AÇIKGÖZ, Hulusi | LE BIHAN, Yan

This paper is concerned with the characterization methodologies of defects in conducting materials by an Electromagnetic Acoustic Transducer (EMAT) testing system. It has been developed to create a virtual environment for Non-Destructive Testing (NDT) before implementing it in real, to study the change effect on the defect geometry at the signal received. EMAT is a new technology, which provides a noncontact process of testing materials compared to ultrasonic testing technique. This work is based on the simulation of two-dimensional numerical model, using Finite Element Method, (FEM) like a si ...Daha fazlası

Konferans Bildirisi 2016 Institute of Electrical and Electronics Engineers Inc. 3 Görüntülenme
Erişime Açık

Statistical Analysis of Electromagnetic Structures and Antennas Using the Polynomial Chaos Expansion Method

AÇIKGÖZ, Hulusi | MITTRA, Raj

Electromagnetic (EM) structures such as antennas, resonators, are widely used in EM communication systems. It is not uncommon to find that the performance characteristics of these structures are not as expected because of the uncertainties introduced during the manufacturing process. These uncertainties may arise, for instance, from variations of the dimensions of the device or its material properties, e.g., permittivity and permeability. A statistical tool based on the use of the Polynomial Chaos Expansion (PCE) technique is proposed in this work. The results of investigation of two EM struct ...Daha fazlası

Konferans Bildirisi 2017 IEEE 5 Görüntülenme
Erişime Açık

Statistical Investigation of a Dual-Band Wearable Patch Antenna

AÇIKGÖZ, Hulusi | MITTRA, Raj

We present a stochastic modeling strategy for studying a wearable textile antenna under different manufacturing conditions. The studied device is a patch antenna designed for energy harvesting, which operates at the GSM and DCS bands, 900MHz and 1800MHz, respectively. The performance of the conductive patch printed on a textile substrate backed by a ground plane is investigated. A stochastic approach is employed to assess the variability of the observable because of the uncertainties introduced in the manufacturing process, such as laminating and embroidering.

Konferans Bildirisi 2017 IEEE 4 Görüntülenme
Erişime Açık

A Novel Microwave Coaxial Slot Antenna for Liver Tumor Ablation

AÇIKGÖZ, Hulusi | TÜRER, İbrahim

This paper is on the effect of a T-ring shape structure to enhance the capability of a microwave coaxial slot antenna (MCA) in the treatment of liver cancer. The MCA is composed of an interstitial coaxial line that is enclosed in a catheter. The T-ring shape structure is wrapped on the outer conductor of the MCA. Thanks to the new structure, the backward heating problem appearing in many coaxial antennas is reduced and the generated heat in front of the slot is higher than those for a classical MCA. © 2014, Tarbiat Modares University. All rights reserved.

Makale 2014 Advanced Electromagnetics 4 Görüntülenme
Erişime Açık

Statistical electromagnetics for antennas

AÇIKGÖZ, Hulusi | ARYA, Ravi Kumar | WIART, Joe | MITTRA, Raj

After a brief introduction, this chapter discusses the state of the art of variable antennas and previous works on these antennas are reviewed. This is followed by an introduction to the most common statistical analysis techniques used for the purpose of the uncertainty propagation. The application of the statistical method to some real case structures is then considered; split ring resonator (SRR) and wearable antennas.

Makale 2018 SCITECH PUBL INC 3 Görüntülenme
Erişime Açık

Predictors Generation by Partial Least Square Regression for microwave characterization of dielectric materials

SADOU, Hakim | HACIB, Tarik | LE BIHAN, Yan | MEYER, Olivier | AÇIKGÖZ, Hulusi

In this paper, the microwave characterization of dielectric materials using open-ended coaxial line probe is proposed. The measuring cell is a coaxial waveguide terminated by a dielectric sample. The study consists in extracting the real and imaginary part of the relative dielectric permittivity (ε = ε′-jε’’) of the material under test from the measurements of the probe admittance (Ymes(f) = Gmes(f)+jBmes(f)) on a broad band frequency (f between 1 MHz and 1.8 GHz), hence a direct and inverse problems have to be solved. In order to build a database, the direct problem is solved using Finite Ele ...Daha fazlası

Makale 2018 Elsevier B.V. 6 Görüntülenme
Erişime Açık

Internal Homogenization of Biological Tissues for Electromagnetic Dosimetry

AÇIKGÖZ, Hulusi

In this paper, the internal homogenization method is introduced to determine the effective physical properties (permittivity and conductivity) of biological tissues. This method is performed on a 2D child head model obtained from MRI data. An original procedure where the complex 2D head model is represented as a multilayered circular structure is employed to retrieve the effective medium parameters. Results obtained with the proposed internal homogenization concept are compared with those obtained from the original heterogeneous model (with 4 tissues) and effective medium theories such as Maxw ...Daha fazlası

Makale 2016 APPLIED COMPUTATIONAL ELECTROMAGNETICS SOC 2 Görüntülenme
Erişime Açık

Suppression of Surface Currents at Microwave Frequency Using Graphene-Application to Microwave Cancer Treatment

AÇIKGÖZ, Hulusi | MITTRA, Raj

In this work we consider the problem of surface currents suppression using graphene in the context of microwave cancer treatment. Most of the research on graphene has been focused on its applications at terahertz frequencies, and not at microwave frequencies. The use of microwave cancer ablation technique using a coaxial slot antenna is being limited because of the existence of surface currents which lead to the heating of the healthy tissues along its outer surface. In this work we propose to use graphene which is a single-atom sheet of carbon, as a solution to prevent the propagation of surf ...Daha fazlası

Makale 2016 APPLIED COMPUTATIONAL ELECTROMAGNETICS SOC 5 Görüntülenme
Erişime Açık

Microwave characterization using partial least square regression

SADOU, Hakim | HACIB, Tarik | LE BIHAN, Yan | AÇIKGÖZ, Hulusi | MEYER, Olivier

Inverse problems for determination of dielectric materials properties (complex permittivity) are usually solved by iterative methods using numerically based forward model. These methods are computationally expensive. In this paper, we propose a fast inversion model based on partial least square regression (PLSR). The idea is to build a model able to predict in real time the properties of the sample under test using measurements of admittance or reflexion coefficient of the propagating electromagnetic micro wave along the coaxial line. Numerical solution of the direct problem is made using Fini ...Daha fazlası

Konferans Bildirisi 2017 Institute of Electrical and Electronics Engineers Inc. 1 Görüntülenme
Erişime Açık

Statistical analysis of 3D-printed flat GRIN lenses

AÇIKGÖZ, Hulusi | ARYA, Ravi Kumar | MITTRA, Raj

This paper presents the statistical analysis of a 3D printed flat lens by using the Polynomial Chaos Expansion (PCE) analysis technique. The flat lens is fabricated using the 3D printing technology and is based on the grading-index (GRIN) approach. It is composed of several concentric rings with graded relative permittivity, made of a single material with different air holes-host material volume ratio. We show that the hole size can have significant effect on the performance of the lens, especially on the focal distance. PCE analysis enables us also to determine the impact of each individual r ...Daha fazlası

Konferans Bildirisi 2016 Institute of Electrical and Electronics Engineers Inc. 7 Görüntülenme
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