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Kara, Ali
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Kara, A
Kara, A.
Kara,A.
Ali, Kara
Kara, Ali
K., Ali
A.,Kara
A., Kara
K.,Ali
Kara, A.
Kara,A.
Ali, Kara
Kara, Ali
K., Ali
A.,Kara
A., Kara
K.,Ali
Job Title
Profesör Doktor
Email Address
ali.kara@atilim.edu.tr
Main Affiliation
Department of Electrical & Electronics Engineering
Status
Former Staff
Website
ORCID ID
Scopus Author ID
Turkish CoHE Profile ID
Google Scholar ID
WoS Researcher ID
Sustainable Development Goals
3
GOOD HEALTH AND WELL-BEING
2
Research Products
4
QUALITY EDUCATION
9
Research Products
6
CLEAN WATER AND SANITATION
2
Research Products
7
AFFORDABLE AND CLEAN ENERGY
1
Research Products
9
INDUSTRY, INNOVATION AND INFRASTRUCTURE
4
Research Products
11
SUSTAINABLE CITIES AND COMMUNITIES
6
Research Products
17
PARTNERSHIPS FOR THE GOALS
2
Research Products
This researcher does not have a Scopus ID.
This researcher does not have a WoS ID.
Scholarly Output
183
Articles
76
Views / Downloads
586/5744
Supervised MSc Theses
34
Supervised PhD Theses
12
WoS Citation Count
690
Scopus Citation Count
1034
WoS h-index
16
Scopus h-index
19
Patents
0
Projects
0
WoS Citations per Publication
3.77
Scopus Citations per Publication
5.65
Open Access Source
42
Supervised Theses
46
Google Analytics Visitor Traffic
| Journal | Count |
|---|---|
| IEEE Access | 7 |
| Microwave and Optical Technology Letters | 5 |
| Electronics | 4 |
| Electromagnetics | 3 |
| Wireless Personal Communications | 3 |
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183 results
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Now showing 1 - 10 of 183
Conference Object Citation - Scopus: 1Characterization of satellite transponder impairments based on simulations with test data(Institute of Electrical and Electronics Engineers Inc., 2015) Ulubey,O.; Gulgonul,S.; Kara,A.A satellite transponder simulator based on actual test data of TURKSAT 3A satellite has been developed to analyze degradation in multicarrier scenarios. Communication impairment sources through a transponder are explained in conjunction with a methodology defined to characterize total degradation resulting from them. Several transponder utilization scenarios are studied with respect to total degradation and optimum operation conditions are demonstrated. © 2015 IEEE.Conference Object Citation - Scopus: 2New Wavelet-Based Features for the Recognition of Jittered and Stagger Pri Modulation Types;(Institute of Electrical and Electronics Engineers Inc., 2015) Gencol,K.; Kara,A.; At,N.In dense electronic warfare environments, numerous emitters can be active simultaneously and an interleaved stream of pulses in natural time of arrival order is received by the Electronic Support Measures (ESM) receiver. It is the task of the ESM system to de-interleave this mixed pulse sequence and thus to identify the surrounding threatening emitters. In this processing, pulse repetition interval (PRI) modulation recognition has a significant role due to the fact that it can reveal the hidden patterns inside pulse repetition intervals and thus help identify the emission source and its functional purpose. In this paper, we propose new wavelet-based features for the recognition of jittered and stagger PRI modulation types. The recognition of these types are heavily based on histogram features. Experimental results show that the proposed feature set have very high recognition rates and outperform histogram based methods. © 2015 IEEE.Conference Object Citation - WoS: 17Citation - Scopus: 23Maintenance, Sustainability and Extendibility in Virtual and Remote Laboratories(Elsevier Science Bv, 2011) Kara, Ali; Ozbek, Mehmet Efe; Cagiltay, Nergiz Ercil; Aydin, ElifThis study presents discussions on sustainability of Virtual and Remote Laboratories (VRL), and provides challenges toward maintenance of VRLs. Technical and pedagogical issues in extension and sustenance of VRLs are discussed with the experiences of the authors gained in the development of a VRL system, European Remote Radio Laboratory (ERRL) platform. Moreover, the study presents actions to be taken in sustenance plan and expendability of VRL system with the advances in Information and Communication Technologies (ICT) and educational technologies along with the needs of educators and learners in formal education. (C) 2011 Published by Elsevier Ltd.Conference Object Distance Laboratory Applications Errl(Ieee, 2008) Aydin, C. C.; Turkmen, G.; Ozyurt, E.; Aydin, E. U.; Cagiltay, N. E.; Ozbek, M. E.; Kara, A.In the last decade, the effect of internet usage in education is gradually increased. When we look from academic perspective, the new technologies provided alternatives for students learning. As distance education becomes important everyday, the indispensable elements of teaching and education, laboratories must be reachable via remote connection. Consequently, the education that is going to be given to the students will be more flexible with respect to place and time constraints and students can reach laboratory facilities at any time and anywhere not only in lectures and practical hours. In this study, European Remote Radio Laboratory (ERRL) which is a distance remote Radio Frequency (RF) laboratory designed for electrical-electronics students, is described generally. The software architecture, infrastructure and experiment that can be done with a remote connection have been described.Master Thesis 77 Ghz Radar Sistemleri için Mikroşerit Anten Tasarımı ve Analizi(2023) Yılmaz, Selen; Dalveren, Yaser; Kara, AliBu tez, 77 GHz otomobil radarı için seri beslemeli mikroşerit yama dizi antenin tasarımı ve operasyonel davranışına yönelik kapsamlı araştırmasını takdim etmektedir. Öncelikli olarak, mikroşerit anten, yama dizi anten, frekans taramalı dizi anten ve Chebyshev dizi anten teorisi hakkında teorik altyapı bilgisi temin edilmiştir. Antenleri tasarlamak ve boyutlarını hassas bir şekilde ayarlamak için sonlu eleman metoduna dayalı tam dalga simülasyon aracı kullanılmıştır. İlk aşamada, 76.5 GHz rezonans frekansında çalışan seri beslemeli doğrusal Chebyshev dizi anten bir verici kanalını temsil etmesi üzerine tasarlanmıştır. Kazancı geliştirmek için toprak-sinyal-toprak geçiş yapısında kullanılmak üzere kısa devre pinlerinden yararlanılmıştır. Pinsiz ve pinli tasarımların bant genişliği ve kazanç bakımından karşılaştırmalı analizi yapılmıştır. Son aşamada, 76.5 GHz doğrusal dizi yama anten 79 GHz doğrusal dizi yama antene GSG geçiş yapısı boyutları optimize edilerek ve her bitişik iki yama elemanı arasındaki aralıklandırma ve yama elemanı uzunlukları ölçeklenerek dönüştürülmüştür. Ölçeklendirme yönteminin etkisini değerlendirebilmek adına bu aşamada iki tasarım sunulmuştur. Bu iki dizi yama anten tasarımının operasyonel özelliklerinin ana kulak yönlendirilme açısı, empedans bant genişliği, total kazanç ve yan kulak baskılanması bakımından karşılaştırmalı analizi yapılmıştır.Master Thesis 77-ghz Otomotiv Radarı ile Çeşitli Nesnelerin Radar Kesit Alanı Ölçümü ve Radar Kesit Alanı Simülasyon Araçlarının Değerlendirilmesi(2022) Sezgin, Deniz; Aydın, Elif; Kara, AliBu tezde, RCS tahmini için en yaygın olarak kullanılan 2 adet elektromanyetik hesaplama yöntemi açıklanmakta ve karşılaştırılmaktadır. Bu karşılaştırmada yer alan yöntemler, yüzey integral denklemlerinin MoM çözümlemesi ile birlikte EFIE ve hibrit bir metod olup PO ve GO birleşimi ile ortaya çıkan SBR yöntemleridir. Öncelikle klasik elektromanyetik teorisi ve RCS hakkında temel bilgiler ve aralarındaki bağlantı sunulmuştur. Daha sonra, bahsedilen karşılaştırmanın teorik bilgi içermesi sebebi ile SBR ve IE yöntemleri için teorik kavramlar da sunulmaktadır. Bu yöntemlerin deneysel sonuçlar yoluyla da birbirleriyle karşılaştırılabilmesi için yapılan ölçümlerde üç hedef cisim kullanılmıştır. Ölçümler bir 77-81 GHz COTS FMCW radar sistemi ile gerçekleştirilmiştir. Ölçümler doğrultusunda, iki farklı ticari araç kullanılarak hem SBR hem de EFIE yöntemleri ile 77 GHz'de simülasyonlar yapılmıştır. Ölçüm ve simülasyon sonuçları arasında iyi bir uyum gözlemlenmekle beraber çeşitli şartlara bağlı olarak her iki yöntemin de kendilerine göre avantajları olduğu görülmektedir.Article Citation - WoS: 5Citation - Scopus: 10Quality of Service Assessment: a Case Study on Performance Benchmarking of Cellular Network Operators in Turkey(Tubitak Scientific & Technological Research Council Turkey, 2015) Kadioglu, Rana; Dalveren, Yaser; Dalveren, Yaser; Kara, Ali; Kara, Ali; Dalveren, Yaser; Kara, Ali; Department of Electrical & Electronics Engineering; Department of Electrical & Electronics EngineeringThis paper presents findings on performance benchmarking of cellular network operators in Turkey. Benchmarking is based on measurements of standard key performance indicators (KPIs) in one of the metropolitan cities of Turkey, Ankara. Performance benchmarking is formulated by incorporating customer perception by conducting surveys on how important KPIs are from the user's point of view. KPIs are measured, with standard test equipment, by drive test method on specified routes. According to the performance benchmarking results, the GSM and UMTS network operators achieving the best performance were determined in Ankara. Speech qualities of network operators, as the most popular service, were also evaluated by several statistical methods including pdf/cdf analysis and chi-square and Fisher's exact tests. The network operator providing the highest speech quality in Ankara was determined with the methods applied. Overall, the results and approaches on benchmarking of cellular networks in Turkey are reported for the first time in this paper. The approaches proposed in this paper could be adapted to wide-scale benchmarking of services in cellular networks.Master Thesis Türkiye?deki Hücresel Ağ Operatörlerin Performans Kıyaslanması(2010) Kadıoğlu, Rana; Kara, AliBu çalışma operatörlerin ağ servis performansının, servis kalitesi açısından değerlendirilmesi ve diğer bir operatör ile kıyaslanması üzerine hazırlanmıştır. Mobil operatörlerin servis kalitesinin kıyaslanması için uygun performans göstergeleri belirlenmiştir.Performans değerlendirilmesi anahtar performans indikatörleri ile yapılmaktadır. Performans indikatörleri her bir kıyaslanacak operatör için belirlenen bir güzergahtan araçlı test metodu ile toplanarak elde edilmiştir. İndikatörlerin en önemlilerinden biri olan ses kalitesinin kıyaslanması için ?² ve Fisher test istatistiksel kıyaslama yöntemi anlatılmış ve sonuçları tartışılmıştır.Conference Object Citation - Scopus: 25Blockage/Shadowing and Polarization Measurements at 2.45ghz for Interference Evaluation Between Bluetooth and Ieee 802.11 Wlan(2001) Kara,A.; Bertoni,H.L.We present measurement results at 2.45 GHz to evaluate blockage shadowing and fading effects due to furniture and people next to terminals for short range indoor communication systems. The followings are the results: people crossing the link near to a terminal can cause fading up to 20dB which is more than furniture blockage measured of about 5-13dB depending on objects over the links, polarization coupling was also measured by using dual polarized antenna at receiving end, and coupling is higher for obstructed links, which suggests polarization diversity.Article A WEB BASED TRAINING MODULE FOR TEACHING DIGITAL COMMUNICATIONS(2015) Kara, Ali; Erdem, Cihangir; Özbek, Mehmet Efe; Çağıltay, Nergiz; Aydın, ElifAn interactive module which simulates a digital transmission link from one end to the other has been designed. Using the module, a user may enter a short audio/message signal using microphone of a PC, and then follows processes on the signal at each stage of the digital transmission link. The user can also analyze the signal at every stage of the link, and compare the performance of various modulation schemes used in the link, and finally may see how the audio signal is corrupted by noise in the transmission link. In this way, from source point to destination point of the signal, the user may study various stages such as analog to digital conversion, analysis of effects of Gaussian noise on the message signal.
