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Manuel ve Otomatik Bölütlenmiş Karaciğer MR Görüntülerinin Füzyonu ile Lezyon Belirginliğinin Artırılması

ERVURAL, Saim | CEYLAN, Murat

Bu çalışmada karaciğer fokal lezyonlarının teşhisinde kullanılan manyetik rezonans (MR) görüntülerinin görüntü füzyonu yöntemleri kullanılarak analiz edilmesi ve uzmanların tercih ettiği manuel bölütleme işlemine otomatik bölütleme sonuçlarını ekleyerek tanı koymalarına yardımcı olunması amaçlanmaktadır. Bu amaçla bulanık bir yöntem kullanılarak otomatik bölütlenmiş ve manuel bölütlenmiş karaciğer MR görüntülerinin füzyonu gerçekleştirilmiştir. Uygulamada 30 farklı hastadan alınmış kontrast öncesi faz, arteryal faz, portal venöz faz, geç venöz faz olmak üzere 4 farklı fazda kaydedilmiş 120 ade ...Daha fazlası

Konferans Bildirisi 2018 26. IEEE Sinyal İşleme ve İletişim Uygulamaları Kurultayı 84 Görüntülenme
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Hardware implementation of a scale and rotation invariant object detection algorithm on FPGA for real-time applications

PEKER, Murat | ALTUN, Halis | KARAKAYA, Fuat

A hardware implementation of a computationally light, scale, and rotation invariant method for shape detection on FPGA is devised. The method is based on histogram of oriented gradients (HOG) and average magnitude difference function (AMDF). AMDF is used as a decision module that measures the similarity/dissimilarity between HOG vectors of an image in order to classify the object. In addition, a simulation environment implemented on MATLAB is developed in order to overcome the time-consuming and tedious process of hardware verification on the FPGA platform. The simulation environment provides ...Daha fazlası

Makale 2016 Turkiye Klinikleri Journal of Medical Sciences 59 Görüntülenme

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 64 Görüntülenme
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Stochastic Polynomial Chaos Expansion Analysis of a Split-Ring Resonator at Terahertz Frequencies

AÇIKGÖZ, Hulusi | MITTRA, Raj

Polynomial chaos expansion (PCE) technique is applied to a conducting array of split-ring resonator to study the effect of the uncertainties of its design parameters on its reflectance at terahertz frequencies. The uniformly distributed random input design parameters have been considered. The first (average) and second (standard deviation) moments are estimated using the PCE. Strong variation of the output response caused by the uncertainties of the design parameters has been noticed. A sensitivity analysis has been carried out to assess the influence of each input parameters on the reflectanc ...Daha fazlası

Makale 2018 IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC 28 Görüntülenme
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New Approaches Based on Real and Complex Forms of Ripplet-I Transform for Image Analysis

YAŞAR, Hüseyin | CEYLAN, Murat

The multi resolution analysis are important parts of image processing. Curvelet transform is analysis method which have been using wide variety of applications in multi resolution analysis. Ripplet-I transform is defined by recently generalising of the curvelet transform by adding parameters support (c) and degree (d). Even though this transform has been found out recently, it has been using wide variety of applications. Fast discrete and complex fast discrete versions of ripplet-I transform were examined by this study. In denoising application, better results were obtained with fast discrete ...Daha fazlası

Konferans Bildirisi 2016 Institute of Electrical and Electronics Engineers Inc. 58 Görüntülenme
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Welding Seam Profiling Techniques Based On Active Vision Sensing For İntelligent Robotic Welding

MUHAMMAD, Jawad | ALTUN, Halis | ABO-SERIE, Essam

Intelligent robotic welding involves replicating the role of a manual professional welder to adaptively control the welding process. This is necessary to achieve accurate, fast and high-quality welding process in addition to the challenging factors for humans to operate in the welding environment. Therefore, robotic welding exists since the early days of robotics and it is still an active research area. This is why there have been numerous researches in this area for a very long time. Among various techniques proposed by researchers for the adaptive control of the robotic welding process, visi ...Daha fazlası

Makale 2017 Springer London 53 Görüntülenme
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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. 83 Görüntülenme
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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 69 Görüntülenme
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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 57 Görüntülenme
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Frequency and impedance reconfigurable antennas for terahertz photomixer

ÜNLÜ, Mehmet | YILMAZ, Adem | YILMAZ, Cihat

We present, for the first time, the design of two antennas for the terahertz photomixers that have reconfigurable operation frequency or reconfigurable input impedance as an alternative to the state-of-the-art high-impedance, narrow band or low-impedance, wide-band antennas. Both antennas have folded-dipole structures, which inherently have high radiation resistances, and the dimensions of the antennas are modified in the horizontal and vertical dimensions by means of ideal switches, changing the operation frequency of the antenna or the input impedance of the antenna at a given operation freq ...Daha fazlası

Konferans Bildirisi 2015 53 Görüntülenme
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Impact of repeaters on the performance of indoor visible light communications

KIZILIRMAK, Refik Çağlar

In this study, we examine the performance of fixed gain amplify-and-forward repeaters for visible light communication (VLC) systems. We present the wireless optical channel model for VLC with the repeater and we evaluate the bit-error-rate (BER) performance for pulse-position modulation over the multipath channel with additive white Gaussian noise. The results reveal that when a repeater is placed, both the BER and the illuminance performance can be improved at any location in a typical office space. The benefit of VLC repeaters is also discussed when the channel from the source to the destina ...Daha fazlası

Makale 2015 77 Görüntülenme
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Termogramların Değerlendirilmesinde Doğru Yaklaşımların Belirlenmesi

ERVURAL, Saim | CEYLAN, Murat | ÖRNEK, Ahmet Haydar | ZENGİN, Duygu | SOYLU, Hanifi

Medikal uygulamalarda etkinliği oldukça artan termal görüntüleme yöntemi ile vücuttan yayılan kızılötesi dalgalar sıcaklık haritalarına ve RGB görüntülere dönüştürülmektedir. Çoklu çözünürlük analizlerinden dalgacık dönüşümü görüntülerin alt frekans bantlarında analiz yapabilmeyi sağlar. Bu çalışmada toplam on tane yenidoğan yoğum bakım ünitesinde tedavi gören bebeğe ait termal görüntü, sıcaklık haritalarına ve RGB görüntülere çevrilerek dalgacık dönüşümü uygulanmıştır. Elde edilen sonuçlara göre Tepe Sinyal Gürültü Oranı (TSGO) sıcaklık haritalarında 35.625, RGB’de 27.695; Yapısal Benzerlik E ...Daha fazlası

Konferans Bildirisi 2018 URSI IX. Bilimsel Kongresi 40 Görüntülenme
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