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9. Improving First Computer Programming Experiences: The Case of Adapting a Web-Supported and Well-Structured Problem-Solving Method to a Traditional Course

Author

Uysal, Murat Pasa

Abstract

The introductory computer programming (CP) course has been taught for three decades in the faculty. Besides pursuing CP technology, one major goal has been enhancing learners' problem-solving (PS) skills. However, the current situation has implied that this might not be the case. Therefore, a research was conducted to investigate the effects of a web-supported and well-structured PS instructional method on academic achievements and PS perceptions of learners. This was a quasi-experimental study with a posttest-only design that included a control group. While the web-supported and traditional approach was adopted for the control group, the experimental group was treated with the web-supported and well-structured PS method. A cluster random sampling was used and the existing 18 sections were randomly assigned to the study groups. Consequently, 6 faculty members and 433 freshman undergraduate students participated in the study for one semester. The students' PS perceptions were assessed by the Problem Solving Inventory (PSI) and their CP performances were measured by an academic achievement test. The results indicated a significant difference between the groups in terms of CP achievements. Except for one factor of the PSI, there were also significant differences between the groups in terms of their PS perceptions.

Published
2014

12. Towards the Use of a Novel Method: The First Experiences on Measuring the Cognitive Load of Learned Programming Skills

Author

Uysal, Murat Pasa

Abstract

Teaching object-oriented programming (OOP) is a difficult task, especially to the beginners. First-time learners also find it difficult to understand. Although there is a considerable amount of study on the cognitive dimension, a few study points out its physiological meaning. Moreover, it has been suggested that neuroscientific studies and methods can enable educational researchers gain an insight into brain and cognitive processes as well. Therefore, this experimental study explored the previously learned OOP skills in terms of cognitive load. By using the functional near-infrared spectroscopy (fNIRS) method, we measured the cognitive load of participants when executing OOP tasks. The average oxygenation changes in prefrontal cortex of the brain represented their total cognitive response to a set of OOP tasks. There were two research questions investigated by this study. The first research question explored whether the average oxygenation changed according to the participants' academic achievements and task completion status. The second research question was for identifying the instant changes in the oxygenations to find out which programming tasks were more contributing to the oxygenation. Later, we compared the findings with experts' judgments. We observed that the fNIRS system was an effective and promising technology for monitoring cognitive tasks both in classrooms and in experimental environments. (Contains 2 figures and 6 tables.)

Published
2013

13. The Domains for the Multi-Criteria Decisions about E-Learning Systems

Author

Uysal, Murat Pasa

Abstract

Developments in computer and information technologies continue to give opportunities for designing advanced E-learning systems while entailing objective and technical evaluation methodologies. Design and development of E-learning systems require time-consuming and labor-intensive processes; therefore any decision about these systems and their analysis needs systematic and structured guidance to lead to better decisions. Multi-Criteria Decision Analysis (MCDA) techniques are applicable in instructional technology-related research areas as well as in other academic disciplines. In this study, a conceptual domain model and a decision activity framework is proposed for E-learning systems. Instructional, technological, and administrative decision domains are included in this model. Finally, an illustrative example is given to show that AHP is an effective MCDA method for E-learning-related decisions. (Contains 4 figures and 9 tables.)

Published
2012

19. A Primer on Underwater Quantum Key Distribution.

Author

Paglierani, Pietro, Fahim Raouf, Amir Hossein, Pelekanakis, Konstantinos, Petroccia, Roberto, Alves, João, and Uysal, Murat

Subjects
SUBMERSIBLES, DATA encryption, ALGORITHMS, QUANTUM mechanics, CIPHERS
Abstract

The growing importance of underwater networks (UNs) in mission-critical activities at sea enforces the need for secure underwater communications (UCs). Classical encryption techniques can be used to achieve secure data exchange in UNs. However, the advent of quantum computing will pose threats to classical cryptography, thus challenging UCs. Currently, underwater cryptosystems mostly adopt symmetric ciphers, which are considered computationally quantum robust but pose the challenge of distributing the secret key upfront. Post-quantum public-key (PQPK) protocols promise to overcome the key distribution problem. The security of PQPK protocols, however, only relies on the assumed computational complexity of some underlying mathematical problems. Moreover, the use of resource-hungry PQPK algorithms in resource-constrained environments such as UNs can require nontrivial hardware/software optimization efforts. An alternative approach is underwater quantum key distribution (QKD), which promises unconditional security built upon the physical principles of quantum mechanics (QM). This tutorial provides a basic introduction to free-space underwater QKD (UQKD). At first, the basic concepts of QKD are presented, based on a fully worked out QKD example. A thorough state-of-the-art analysis of UQKD is carried out. The paper subsequently provides a theoretical analysis of the QKD performance through free-space underwater channels and its dependence on the key optical parameters of the system and seawater. Finally, open challenges, points of strength, and perspectives of UQKD are identified and discussed. [ABSTRACT FROM AUTHOR]

Published
2023
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20. Free Space Optical Communication: An Enabling Backhaul Technology for 6G Non-Terrestrial Networks.

Author

Elamassie, Mohammed and Uysal, Murat

Subjects
FREE-space optical technology, DRONE aircraft, FIBER optics, OPTICAL spectra
Abstract

The deployment of non-terrestrial networks (NTNs) is envisioned to achieve global coverage for 6G and beyond. In addition to space nodes, aerial NTN nodes such as high-altitude platform stations (HAPSs) and rotary-wing unmanned aerial vehicles (UAVs) could be deployed, based on the intended coverage and operational altitude requirements. NTN nodes have the potential to support both wireless access and backhauling. While the onboard base station provides wireless access for the end users, the backhauling link connects the airborne/space-borne base station to the core network. With its high data transmission capability comparable to fiber optics and its ability to operate in the interference-free optical spectrum, free space optical (FSO) communication is ideally suited to backhauling requirements in NTNs. In this paper, we present a comprehensive tutorial on airborne FSO backhauling. We first delve into the fundamentals of FSO signal transmission and discuss aspects such as geometrical loss, atmospheric attenuation, turbulence-induced fading, and pointing errors, all of which are critical for determining received signal levels and related link budget calculations. Then, we discuss the requirements of airborne backhaul system architectures, based on use cases. While single-layer backhaul systems are sufficient for providing coverage in rural areas, multi-layer designs are typically required to establish connectivity in urban areas, where line of sight (LoS) links are harder to maintain. We review physical layer design principles for FSO-based airborne links, discussing both intensity modulation/direct detection (IM/DD) and coherent modulation/coherent demodulation (CM/CD). Another critical design criteria for airborne backhauling is self-sustainability, which is further discussed in our paper. We conclude the paper by discussing current challenges and future research directions. In this context, we discuss reconfigurable intelligent surfaces (RIS) and spatial division multiplexing (SDM), for improved performance and an extended transmission range. We emphasize the importance of advanced handover techniques and scalability issues for practical implementation. We also highlight the growing role of artificial intelligence/machine learning (AI/ML) and their potential applications in the design and optimization of future FSO-based NTNs. [ABSTRACT FROM AUTHOR]

Published
2023
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21. Evaluation of Learning Environments for Object-Oriented Programming: Measuring Cognitive Load with a Novel Measurement Technique

Author

Uysal, Murat Pasa

Abstract

Various methods and tools have been proposed to overcome the learning obstacles for Object-Oriented Programming (OOP). However, it remains difficult especially for novice learners. The problem may be not only adopting an instructional method, but also an Integrated Development Environment (IDE). Learners employ IDEs as a means to solve programming problems and an inappropriate IDE may impose additional cognitive load. Therefore, this quasi-experimental study tried to identify the cognitive effects of a more visually supportive and functional IDE. It was explored by the functional near-infrared spectroscopy method, which is a relatively new physiological tool for measuring cognitive load. Novice students participated in the study in two experimental groups and they were required to write a Java application using two different IDEs. The results indicated a significant difference between the experimental groups and the findings are discussed in view of the principles of Cognitive Load Theory and Multimedia Learning.

Published
2016
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25. Interviews with College Students: Evaluating Computer Programming Environments for Introductory Courses

Author

Uysal, Murat Pasa

Abstract

Different methods, strategies, or tools have been proposed for teaching Object Oriented Programming (OOP). However, it is still difficult to introduce OOP to novice learners. The problem may be not only adopting a method or language, but also use of an appropriate integrated development environment (IDE). Therefore, the focus should be on the needs of learners when selecting an IDE and the evaluations for instructional purposes may allow making objective decisions for an introductory course design. There are different methods or frameworks for evaluating IDEs and the majority focuses on the experts' needs. Unfortunately, studies done on instructional appropriateness of IDEs are insufficient. In this study, an evaluation framework is initially proposed, then the candidate IDEs are evaluated, and finally, the perceptions of college students are explored by conducting semi-structured interviews. The data are analyzed by the Verbal Analysis technique, and the results are discussed in view of the evaluation criteria. The results imply that the learners view one of the criteria relatively more supportive for learning.

Published
2014

27. Wireless Sensing using Vehicle Headlamps for Intelligent Transportation Systems: Proof of Concept

Author

Abuella Hisham, Ekin Sabit, Ahmed Samir, Miramirkhani Farshad, Kebapci Burak, and Uysal Murat

Subjects
Engineering (General). Civil engineering (General), TA1-2040
Abstract

Vehicular communication and sensing technologies are mainly based on the conventional radio frequency (RF) or laser technologies. These systems suffer from several issues such as RF interference and poor performance in scenarios where the incidence angle between the speed detector and the vehicle is rapidly varying. Introducing a new sensing technology will add diversity to these systems and enhance the reliability of the real-time data. In this study, we investigate our speed estimation sensing system named “Visible Light Detection and Ranging (ViLDAR)”. ViLDAR utilizes visible light sensing technology to measure the variation of the vehicle's headlamp light intensity and estimate the vehicle speed. The measurement settings of the ViLDAR experiments are presented. The preliminary results obtained in the real-world environment/setting are promising when compared to the simulations. Additional measurements using the ViLDAR prototype will be conducted under different conditions and scenarios to further optimize the system.

Published
2019
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28. Effects of Hesperidin and Diosmin on Necrotizing Enterocolitis: An Experimental Study.

Author

Şenel, Ufuk, Tanriverdi, Halil Ibrahim, Tanriverdi, Sema, Sapmaz, Hilal Irmak, Akbaş, Ali, Gevrek, Fikret, Uysal, Murat, and Taş, Ufuk

Subjects
ANTIOXIDANT analysis, NEONATAL necrotizing enterocolitis, GASTROINTESTINAL system, GLUTATHIONE, STOMACH, EXPERIMENTAL design, COLON (Anatomy), STAINS & staining (Microscopy), ANIMAL experimentation, APOPTOSIS, OXIDIZING agents, RATS, MALONDIALDEHYDE, FLAVONES, RESEARCH funding, FLAVANONES, CECUM, ILEUM, PHARMACODYNAMICS
Abstract

Background: Necrotizing enterocolitis (NEC) is a serious intestinal illness in newborns. Objectives: We aimed to investigate the potential protective effects of hesperidin (Hsd) and diosmin on NEC. Methods: Thirty newborn rats were divided into 3 groups: the control group (n=10), the NEC group (n=10), and the treatment group (n = 10). The treatment group was given 100 mg/kg of the flavonoid by oral gavage twice daily. On day 5 of the study, animals were sacrificed under anesthesia. After laparotomy, the tissue samples were obtained from the stomach, cecum, and ileum. NEC scoring was performed histopathologically. Apoptotic changes were evaluated by TUNEL (terminal deoxynucleotidyl transferase-mediated biotin-deoxyuridine triphosphate nick-end labeling) staining. Furthermore, levels of oxidants and antioxidants were determined by biochemical analyzes of the tissues. Results: Glutathione peroxidase (GSH-Px) activity and malondialdehyde (MDA) levels were significantly higher in the NEC group than in the control group in all gastrointestinal tract regions examined. Similar to the control group, GSH-Pxand MDA were found to be low only in the cecum in the group treated with flavonoids. NEC damage score and apoptotic index in all 3 regions examined were significantly higher in the NEC group than in the control and treatment groups. The apoptotic index values in the treatment group were similar in the stomach and cecum, and the NEC damage score was similar to those in the control group only in the cecum. Conclusions: Hsd and diosmin treatment significantly reduces the severity of NEC-induced damage and apoptotic cell death, especially in the cecum. [ABSTRACT FROM AUTHOR]

Published
2023

30. Vehicular VLC System With Selection Combining.

Author

Aly, Bassam, Elamassie, Mohammed, and Uysal, Murat

Subjects
OPTICAL communications, PROBABILITY density function, VISIBLE spectra, PHOTODETECTORS, LIGHT emitting diodes, AUTOMOBILE lighting
Abstract

The availability of LED-based headlights and taillights makes possible the use of visible light communication (VLC) as a wireless access technology for vehicle-to-vehicle (V2V) communications. A critical concern to establish a reliable VLC link between two moving vehicles is the number of photodetectors and their locations on the destination vehicle. In this paper, we experimentally investigate the usage of dual photodetectors for a vehicular VLC system with selection combining to enhance signal reception in mobile conditions. We measure the electrical receive signal-to-noise ratio (SNR) for each individual photodetector as well as at the output of selection combiner in two different tracks involving straight and curved roads. Through data fitting to experimental data, we obtain a probability density function (PDF) to describe the instantaneous SNR. Based on the PDF, we derive a closed-form expression for the average bit error rate (BER) in the form of a finite summation and compare it with the measurements. [ABSTRACT FROM AUTHOR]

Published
2022
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31. Modulating Retroreflector Based Free Space Optical Link for UAV-to-Ground Communications.

Author

Dabiri, Mohammad Taghi, Rezaee, Mohsen, Mohammadi, Leila, Javaherian, Farhang, Yazdanian, Vahid, Hasna, Mazen O., and Uysal, Murat

Abstract

Weight reduction and low power consumption are key requirements in the next generation of unmanned aerial vehicle (UAV) networks. Employing modulating retro-reflector (MRR)-based free space optical (FSO) technology is an innovative technique for UAV-to-ground communication in order to reduce the payload weight and power consumption of UAVs which leads to increased maneuverability and flight time of UAV. In this paper, we consider an MRR-based FSO system for UAV-to-ground communication. We will show that the performance of the considered system is very sensitive to tracking errors. Therefore, to assess the benefits of MRR-based UAV deployment for FSO communications, the MRR-based UAV FSO channel is characterized by taking into account tracking system errors along with UAV’s orientation fluctuations, link length, UAV’s height, optical beam divergence angle, effective area of MRR, atmospheric turbulence and optical channel loss in the double-pass channels. To enable effective performance analysis, tractable and closed-form expressions are derived for probability density function of end-to-end signal to noise ratio, outage probability and bit error rate of the considered system under both weak-to-moderate and moderate-to-strong atmospheric turbulence conditions. The accuracy of the analytical expressions is verified by extensive simulations. Analytical results are then used to study the relationship between the optimal system design and tracking system errors. [ABSTRACT FROM AUTHOR]

Published
2022
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32. Interference Management Strategies for Multiuser Multicell MIMO VLC Systems.

Author

Naser, Shimaa, Bariah, Lina, Muhaidat, Sami, Al-Qutayri, Mahmoud, Uysal, Murat, and Sofotasios, Paschalis C.

Abstract

This paper investigates different precoding strategies for rate splitting multiple access (RSMA) in the downlink of multi-cell visible light communication (VLC) networks. Since classical Shannon capacity formula does not hold for VLC, we first provide a lower bound on the channel capacity for RSMA in such interfering networks. Then, we formulate a spectral efficiency maximization problem to jointly find the optimal rate-splitting and transmit precoding. Beside that, since cell-edge users suffer from additional inter-cell interference, we propose to design the precoders of different RSMA signals utilizing coordinated beamforming (CB). Subsequently, aiming to improve the performance of the CB design for RSMA, while maintain a reduced complexity, we introduce two enhanced precoding strategies for RSMA. To the best of the authors’ knowledge such a contribution has not been considered before in the open literature. It is shown in the paper that the formulated optimization problem is non-convex and a sub-optimal, yet, a low complexity solution can be obtained efficiently using semi-definite relaxation combined with successive convex approximation. Through analytical results, we illustrate the flexibility and superiority of the proposed precoding strategies for RSMA over conventional coordinated space division multiple access and non-orthogonal multiple access for different scenarios and network loads. [ABSTRACT FROM AUTHOR]

Published
2022
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33. Measurement Based Non-Line-of-Sight Vehicular Visible Light Communication Channel Characterization.

Author

Turan, Bugra, Narmanlioglu, Omer, Koc, Osman Nuri, Kar, Emrah, Coleri, Sinem, and Uysal, Murat

Subjects
OPTICAL communications, VISIBLE spectra, ORTHOGONAL frequency division multiplexing, IMPULSE response, TRAFFIC safety
Abstract

Vehicular visible light communication (V-VLC) aims to provide secure complementary vehicle-to-everything-communications (V2X) to increase road safety and traffic efficiency. V-VLC provides directional transmissions, mainly enabling line-of-sight (LoS) communications. However, reflections due to nearby objects enable non-line-of-sight (NLoS) transmissions, extending the usage scenarios beyond LoS. In this paper, we propose wide-band measurement based NLoS channel characterization, and evaluate the performance of direct current biased optical orthogonal frequency division multiplexing (DCO-OFDM) V-VLC scheme for NLoS channel. We propose a distance based NLoS V-VLC channel path loss model considering reflection surface characteristics and NLoS V-VLC channel impulse response (CIR) incorporating the temporal broadening effect due to vehicle reflections through weighted double gamma function. The proposed path loss model yields higher accuracy up to 14 dB when compared to single order reflection model whereas CIR model estimates the full width at half maximum up to 2 ns accuracy. We further demonstrate that the target bit-error-rate of $10^{-3}$ can be achieved up to 7.86 m, 9.79 m, and 17.62 m distances for black, orange and white vehicle reflection induced measured NLoS V-VLC channels for DCO-OFDM transmissions. [ABSTRACT FROM AUTHOR]

Published
2022
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38. Platform presentations

Author

Pereda, Jaime, Niimi, Gen, Kaul, Jagat Mohini, Mishra, Sabita, Pangtey, Babita, Peri, Daniele, Cannella, Vincenza, Peri, Giovanni, Valentino, A., Li Volsi, Francesco, Lo Verde, Rosaria, Russo, E., Sciuto, A., Sunseri, Annalisa, Modica, Giuseppe, Gravante, Gianpiero, Ong, Seok Ling, Metcalfe, Matthew, Lloyd, David, Dennison, Ashley, Macchi, Veronica, Porzionato, Andrea, Parenti, Anna, De Caro, Raffaele, Al-Harmni, Kawthar I. F., Rahemo, Zohair I. F., Al-Khan, Hussain I. A., Bakan, Vedat, Demirpolat, Gulen, Bozkurt, Mahmut, Gumusalan, Yakup, Acer, Niyazi, Demir, Mehmet, Taskoparan, Hulusi, Akkaya, Akcan, Yildirim, Birdal, Camurdanoglu, Mehmet, Guven, Gul, Ozden, Hilmi, Kabay, Sahin, Ustuner, Cengiz, Burukoglu, Dilek, Ustuner, Derya, Degirmenci, Irfan, Akyuz, Fahrettin, Tekin, Neslihan, Kucuk, Fulya, Gurer, Firdevs, Ustuner, M. Cengiz, Ozbag, Davut, Ozkaya, Mesut, Ciralik, Harun, Tolun, Fatma Inanc, Yuzbasioglu, Fatih, Arslan, Seda, Moshkdanian, Ghazaleh, Pouya, Fatemeh, Nematollahi-Mahani, Amirmahdi, Nematollahi-Mahani, Seyed Noureddin, Ger, Ralph, Nikfarjam, Jeremy, Dooley, Kathy, Liu, Shuwei, Li, Zhenping, Lin, Xiangtao, Meng, Haiwei, Liu, Cheng, Feng, Lei, Chung, Min Suk, Shin, Dong Sun, Havet, Eric, Dujardin, Anne-Claire, Duparc, Fabrice, Freger, Pierre, Oommen, Anitha, Stosch, Christoph, Koebke, Jürgen, Herzig, Stefan, Jqbal, Adam, Gazzani, Paul, Rattay, Tim, Fruhstorfer, Birgit, Vohrah, Anil, Wellings, Richard M., Brydges, Stephen, Smith, Gregory R., Roebuck, Jamie, Abrahams, Peter H., Baca, Vaclav, Otcenasek, Michal, Svatos, Filip, Smrzova, Tereza, Grill, Robert, Kachlik, David, Skubal, Jan, Dzupa, Valer, Doubkova, Alena, Klepacek, Ivo, Stingl, Josef, Ali, Muddathir, Bedir, Yahya, Weber, Günther, Malek, Karim, Patrick, Amos, Rochambeau, Brent, Knickelbein, Phil, Choi, Da-Yae, Hur, Mi-Sun, Youn, Kwan-Hyun, Hu, Kyung-Seok, Kim, Hee-Jin, Aksoy, Fadullah, Yildirim, Yavuz Selim, Ozturan, Orhan, Acar, Hurtan, Demirhan, Hasan, Veyseller, Bayram, Prades, Jean Michel, Timoshenko, Andrei, Asanau, Alexander, Gavid, Marie, Martin, Christian, Ayestaray, Benoit, Auquit-Auckbur, Isabelle, Millez, Pierre-Yves, Ercakmak, Burcu, Bayramoglu, Alp, Ozsoy, Hakan, Demiryurek, Deniz, Tuccar, Eray, Akita, Keiichi, Yamaguchi, Kumiko, Kato, Atsuo, Mochizuki, Tomoyuki, Beldame, Julien, Mure, Jean-Philippe, Lefebvre, Benjamin, Lloyd, David M., Karmand, K. J., Norwood, M. G., Kale, Aysin, Gayretli, Ozcan, Ozturk, Adnan, Gurses, Ilke Ali, Usta, Ahmet, Sahinoglu, Kayihan, Kaynak, Gokhan, Bilgili, Mustafa, Akgun, Isik, Ogut, Tahir, Unlu, Mehmetcan, Uzun, Ibrahim, Valentino, Biagio, Farina, Elvira, Kato, Tomoyasu, Pavlov, Stoyan, Grosheva, Maria, Irintchev, Andrey, Angelov, Doychin, Sen, Tulin, Esmer, Ali Firat, Karahan, S. Tuna, Delas, Benoit, Marie, Jean Pierre, Sabourin, Jean Christophe, Hebda, Anna, Aland, Rachel Claire, Apaydin, Nihal, Apan, Alparslan, Uz, Aysun, Comert, Ayhan, Arslan, Mehmet, Acar, Halil Ibrahim, Ozdemir, Mevci, Elhan, Alaittin, Tekdemir, Ibrahim, Tubbs, R. Shane, Attar, Ayhan, Ugur, Hasan Caglar, Fazliogullari, Zeliha, Uysal, Ismihan Ilknur, Karabulut, Ahmet Kagan, Dogan, Nadire Unver, Seker, Muzaffer, Cankara, Neslihan, Malas, Mehmet Ali, Evcil, Emine Hilal, Firat, Aysegul, Erbil, Mine, Kaymaz, Figen, Yuruker, Sinan, Sen, Semiha, Tadjalli, Mina, Ghazi, Seid Reza, Parto, Paria, Ghazi, Seyed Reza, Beser, Ceren Gunenc, Karcaaltincaba, Musturay, Celik, H. Hamdi, Basar, Ruhgun, Cilingiroglu, Serpil, Ozbakir, Cemal, Kose, Kenan, Karahan, Suleyman Tuna, Ozguner, Gulnur, Sulak, Osman, Best, Irwin, Turyna, Radovan, Malkoc, Ismail, Karagoz, Huseyin, Alp, Bilal Firat, Gundogdu, Cemal, Diyarbakir, Samih, Ghazi, Firas, Karanis, Panagiotis, Rajangam, Sayee, Tilak, Preetha, Devi, Rema, Seifi, Bita, Majd, Naeem Earfani, Dorstghol, Mehran, Niakan, Negar, Yousefi, Behpour, Bromand, Nooshin, Haghighi, Saeed, Shafaroudi, Majid Malekzadeh, Daly, Craig, McGrath, John Chris, Ahadi, Reza, Bakhtiary, Mehrdad, Joghataei, Mohammad Taghi, Mehdizadeh, Mehdi, Khoei, Samideh, Marzban, Mohsen, Salehinejad, Parvin, Torshizi, Zahra, Mohit, Maryam, Alithan, Nourjahan Banou, Adulmanaf, Ali, Abdulrahman, Omar, Moallem, Seyed Adel, Hosseini, Bibi Ezzat, Afshar, Mohammad, Taheri, Mohammad Mehdi Hasanzadeh, Hami, Javad, Davari, Mohammad Hossein, Kalbasi, Saeid, Najafzade, Noroz, Nobakht, Malihe, Safari, Manoochehr, Asalgoo, Sara, Roshandel, Nahid Rahbar, Joghataeei, Mohamad Taghi, Bakhtiari, Mehrdad, Safar, Farid, Salamat, Negin, Alboghobeish, Naeem, Hashemitabar, Mahmood, Mesbah, Mehrzad, Biegaj, Ewa, Skadorwa, Tymon, Kapolka, Robert, Ciszek, Bogdan, Piagkou, Maria, Piagkos, Giannoulis, Aikaterini, Vassiliki Kouki, Douvetzemis, Stergios, Skandalakis, Panagiotis, Anagnostopoulou, Sophia, Haffajee, Mohamed Rashid, Ebrahim, Mohamed Adoobaker, Smith, J. W., Osmotherly, Peter, Rivett, Darren, Mercer, Susan, Yue, Bin, Kwak, Dai-Soon, Nam, Yong-Seok, Lee, Je-Hun, Lee, U-Young, An, Xiaochun, Lee, Mi-Sun, Han, Seung-Ho, Songur, Ahmet, Eser, Olcay, Alkoc, Ozan, Toktas, Muhsin, Caglar, Veli, Kaner, Tuncay, Yilmaz, Mehmet Tugrul, Gumus, Serter, Uysal, Isinman Ilknur, Paksoy, Yahya, Ulusoy, Mahinur, Balioglu, Mehmet Bulent, Savran, Koray, Zorer, Gazi, Fujishiro, Hitomi, Muneta, Takeshi, Sato, Kenji, Vernois, Joël, Mertl, Patrice, Sun, Bo, Haitao, Ge, Yuchun, Tang, Zhang, Zhonghe, Teng, Gaojun, Geng, Hequn, Yu, Taifei, Sehirli, Umit S., Verimli, Ural, Ulupinar, Emel, Yucel, Ferruh, Neto, Lia, Oliveira, Edson, Neto, Daniel, Martins, Hugo, Reis, Inácio, Correia, Francisco, Ferreira, António Goncalves, Regala, Joana, Fernandes, Paula, Teixeira, Joana, Yonguc, G. Nilufer, Ozdemir, M. Bulent, Kucukatay, Vural, Sahiner, Melike, Kursunluoglu, Raziye, Adiguzel, Esat, Akdogan, Ilgaz, Yilmaz, Yusuf, Kucukatay, Melek Bor, Erken, Gulten, Kurt, M. Ayberk, Kafa, Ilker M., Uysal, Murat, Bakirci, Sinan, Prakash, Suraj, Anand, Mahindra Kumar, Verma, Meena, Basiri, Mohsen, Doucette, Ronald, Tang, Yuchun, Fan, Lingzhong, Aydin, Mehmet Dumlu, Atalay, Canan, Altas, Sare, Bayram, Ednan, Unal, Bunyami, Asian, Sahin, Feigl, Georg, Anderhuber, Friedrich, Rienmuller, Rainer, Guyot, Jean Phillippe, Fasel, Jean H. D., Kos, Izabel, Ozen, Oguz Aslan, Sarsilmaz, Mustafa, Grant, Gunnar, Nourani, Mohammad Reza, Jamali, Zahra, Taghipour, Hamid Reza, Owada, Yuji, Khalili, Mohammad Ali, Clower, Ben R., Anvari, Morteza, Sadeghian, Fatemeh, Fesahat, Farzaneh, Miresmaili, Seyd Mohsen, Pourheydar, Bagher, Joghataeei, Mohammad Taghi, Pirhajati, Vahid, Faghihi, Abolfazl, Mehraeen, Fereshteh, Jafari, S. Saeed Seyed, Aliaghaei, Abbas, Nematollahi-Mahani, S. Noureddin, Sheibani, Vahid, Asadi, Majid, Kaka, Gholam Reza, Tiraihi, Taki, Budohoski, Karol, Kunicki, Jacek, Pilsl, Ulrike, Pelin, Can, Ozener, Baris, Kurkcuoglu, Ayla, Zagyapan, Ragiba, Zurada, Anna, Gielecki, Jerzy, Ay, Hakan, Grignon, Bruno, Walter, Frederic, Batch, Toufik, Varlam, Horatiu, Iopincariu, Iulian, Benkhadra, Mehdi, Lenfant, Francois, Trouilloud, Pierre, Kastner, Manuel, and Rudolf, Likar

Published
2009
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39. Poster presentations

Author

Aksu, Funda, Topacoglu, Hakan, Arman, Candan, Atac, Aytul, Tetik, Suleyman, Hasanovic, Aida, Kulenovic, Amela, Mornjakovic, Zakira, Pikula, Branko, Sarac-Hadzihalilovic, Aida, Voljevica, Alma, Bamac, Belgin, Colak, Tuncay, Alemdar, Murat, Dundar, Gulmine, Selekler, Macit, Dincer, Ozgur, Colak, Enis, Ozbek, Aydin, Kilic, Cenk, Kamburoglu, Kivanc, Ozen, Tuncer, Kavak, Vatan, Kirici, Yalcin, Oztas, Emin, Soysal, Handan Altinkaya, Unur, Erdogan, Ekinci, Nihat, Karaca, Omur, Malakhova, Olga, Kocaoglu, Murat, Toker, Serdar, Taser, Figen, Kilincoglu, Volkan, Yurtgun, Mustafa Fahri, Dalcik, Cannur, Zeybek, Ali, Baroncini, Marc, Peltier, Johann, Jissendi, Patrice, Pruvo, Jean-Pierre, Francke, Jean-Paul, Prevot, Vincent, Kosif, Rengin, Arifoglu, Yasin, Diramali, Murat, Sarsilmaz, Mustafa, Kose, Evren, Ogeturk, Murat, Akpinar, Burhan, Kus, Ilter, Meydan, Sedat, Kara, Alev, Kurtoglu, Zeliha, Tekdemir, Ibrahim, Elhan, Alaittin, Bas, Orhan, Odaci, Ersan, Mollaoglu, Hakan, Ucok, Kagan, Kaplan, Suleyman, Senoglu, Mehmet, Nacitarhan, Vedat, Kurutas, Ergul Belge, Senoglu, Nimet, Altun, Idris, Atli, Yalcin, Ozbag, Davut, Karakas, Sacide, Bilgin, M. Dincer, Tellioglu, Ayfer Metin, Ozlem, Sercin, Akcanal, Betul, Yildiz, Yuksel, Gunes, Hakki, Kose, Hayrullah, Uzum, Ibrahim, Gundogmus, Umit Naci, Caglayan, Cigdem, Pavlova, Velichka, Dimitrova, Mashenka, Georgieva, Lilia, Nikolova, Elena, Uzmansel, Deniz, Ozturk, Nail Can, Saylam, Canan Yurttas, Ozgiray, Erkin, Orhan, Mustafa, Cagli, Sedat, Zileli, Mehmet, Ozkan, Derya, Akkaya, Taylan, Comert, Ayhan, Balikci, Nilgun, Ozdemir, Esra, Gumus, Haluk, Ergul, Zafer, Kaya, Oskay, Altun, Serdar, Unlu, R. Erkin, Orbay, Hakan, Kim, Deog-Im, Han, Seung-Ho, Kim, Yi-Suk, Kim, Ho-Jeong, Lee, Kyu-Seok, Elcioglu, Omur, Ozden, Hilmi, Guven, Gul, Imre, Nurcan, Yalcin, Bulent, Ozan, Hasan, Akyer, Pinar, Guvencer, Mustafa, Karatosun, Vasfi, Sagoo, Mandeep Gill, Aland, Rachel Claire, Ustuner, Derya, Ustuner, M. Cengiz, Ai, Jafar, Ghazi, Seyed Reza, Mansouri, Seyed Hadi, Tuncer, Mehmet Cudi, Aluclu, Mehmet Ufuk, Karabulut, Ozlen, Hatipoglu, Eyup Savas, Nazaroglu, Hasan, Icke, Cigdem, Akbay, Emrah, Gunay, Turkan, Icke, Suleyman, Yildiz, Selda, Yazar, Fatih, Barlas, Barcin Orhan, Zahoi, Delia Elena, Kavakli, Ahmet, Tas, Ufuk, Dabak, Durrin Ozlem, Sapmaz, Hilal Irmak, Kocabiyik, Necdet, Ozer, Cenk Murat, Ozcan, Ayhan, Elevli, Levent, Desdicioglu, Kadir, Alanbay, Ibrahim, Govsa, Figen, Saylam, Canan Y., Akdogan, Ilgaz, Kiroglu, Yilmaz, Onur, Sule, Evcil, Emine Hilal, Cankara, Neslihan, Malas, Mehmet Ali, Kalcioglu, M. Tayyar, Duman, Serdar, Ulcay, Tufan, Uzun, Ahmet, Karabulut, Zulfu, Barut, Cagatay, Sevinc, Ozdemir, Yurdakan, Gamze, Kacar, Dundar, Erdogan, Ali Riza, Kurt, Hulyam, Demir, Bunyamin, Saltan, Mustafa, Burukoglu, Dilek, Ustuner, Mehmet Cengiz, Degirmenci, Irfan, Erdogan, Aliriza, Damar, Ozlem, Is, Merih, Bayramoglu, Gokhan, Kabay, Sahin, Uysal, Onur, Senturk, Hakan, Bayramoglu, Aysegul, Ozbayar, Cansu, Kutlu, Ali, Canbek, Mediha, Cevli, Salih Cenap, Hancerlioglu, Oguz, Koplay, Mustafa, Aksakalli, Elif, Dikici, Fatih, Kale, Aysin, Gayretli, Ozcan, Gurses, Ilke Ali, Ozdemir, Senem Turan, Ercan, Ilker, Baskan, Emel Bulbul, Yilmaz, Mediha, Ozkaya, Guven, Saricaoglu, Hayriye, Erturk, Mete, Kayalioglu, Gulgun, Uzel, Mehmet, Kahraman, Guler, Tanyeli, Ercan, Soyluoglu, Ali Ihsan, Tacar, Orhan, Demirant, Ayda, Bilgin, Murat, Karadede, Aziz, Aktas, Ayfer, Evcil, E. Hilal, Koyuncu, Esra, Sulak, Osman, Albay, Soner, Ozguner, Gulnur, Ozbek, Ahmet, Ozbek, Elvan, Ozturk, A. Hakan, Demirci, Tuba, Ciftcioglu, Engin, Demir, Mehmet Tevfik, Kopuz, Cem, Eroglu, Esra, Gedikli, Semin, Ozyurek, Hamit, Nural, Mehmet Selim, Incesu, Lutfi, Ogur, Gonul, Kara, Engin, Celebi, Baris, Yildiz, Altan, Altunkaynak, B. Zuhal, Kuvat, Samet Vasfi, Tagil, Suleyman Murat, Ertekin, Cumhur, Uysal, Hilmi, Bademkiran, Fikret, Albayrak, Nural, Esmer, Ali Firat, Coskun, Nigar Keles, Sindel, Muzaffer, Kizilay, Ferah, Yalin, Sevket, Karapinar, Nevin, Tokdemir, Mehmet, Karakurt, Lokman, Tumkaya, Levent, Korkmaz, Adnan, Ayas, Bulent, Ciftci, Nusret, Terzi, Yuksel, Baran, Ozlem, Nergiz, Yusuf, Akkus, Murat, Aluclu, Ufuk, Topal, Askin Ender, Yuksel, Dilek, Acar, Halil Ibrahim, Kendir, Simel, Hekimoglu, Emre, Basman, Deniz, Duman, Sunay, Ozener, Baris, Pelin, Can, Zagyapan, Ragiba, Kurkcuoglu, Ayla, Koc, Mustafa, Erdinc, Meral, Erdinc, Levent, Kelle, Ilker, Sancakdar, Enver, Cetin, Nil, Tunik, Selcuk, Yildirim, Ayse, Kaplanoglu, Iskender, Ayaz, Ercan, Ilhan, Necip, Okumus, Mehmet, Yuksel, Kasim Zafer, Ciralik, Harun, Yilmaz, Zeki, Gumusalan, Yakup, Gamsizkan, Mehmet, Kazkayasi, Mustafa, Dogan, Nadire Unver, Uysal, Ismihan Ilknur, Karalezli, Aylin, Fazliogullari, Zeliha, Buyukmumcu, Mustafa, Bozkurt, Mehmet Cem, Cicekcibasi, Aynur Emine, Demiryurek, Deniz, Ozsoy, M. Hakan, Bayramoglu, Alp, Tuccar, Eray, Baran, Ozlem Pamukcu, Soker, Sevda, Bahceci, Selen, Nasir, Yasemin, Yilmaz, Mehmet Tugrul, Cicekcibasi, Emine Aynur, Ulusoy, Mahinur, Gunaslan, Pervin, Bilge, Nuray, Akkaya, Muzaffer, Genc, Abdurrahman, Akcer, Sezer, Gonul, Yucel, Cosar, Emine, Koken, Gulengul, Ari, Ilknur, Bakirci, Sinan, Kafa, Ilker Mustafa, Uysal, Murat, Karabulut, Ahmet Kagan, Keles, Bahar, Emlik, Dilek, Uyar, Yavuz, Ozturk, Kayhan, Yilmaz, Neslihan Altuntas, Salbacak, Ahmet, Kacira, Burkay Kutluhan, Arazi, Mehmet, Demirci, Serafettin, Kiresi, Demet, Gumus, Serter, Seker, Muzaffer, Uyar, Mehmet, Astaneh, Mohammad Ebrahim, Khorshid, Alireza, Uygur, Ramazan, Songur, Ahmet, Sonmez, Osman Fikret, Dogan, Kamil Hakan, Kolcu, Giray, Iliescu, Madalina, Bordei, Petru, Iliescu, Dan, Ciobotaru, Camelia, Lucescu, Viorel, Covaleov, Anatoli, Ionescu, Constantin, Guirao, Miguel, Páramo, E., Mutuberria, R., Sánchez-Montesinos, I., Roda, O., Girón, F., Lopez-Soler, Miguel, Roda, Olga, Campos-López, Raúl, Guirao-Piñeiro, Miguel, Pascual-Morenilla, Maria Teresa, Sanchez-Montesinos, Indalecio, Pascual, Maria Teresa, Garzon, I., Serrato, D., Nieto-Aguilar, R., Sanchez-Montesinos, I., Sanchez-Quevedo, M., Ozdemir, M. Bulent, Ozean, R. Hakan, Bagdatli, Dilek, Adiguzel, Esat, Dogan, Zumrut, Aycan, Ozlem, Vardi, Nigar, Erkal, Haldun Sukru, Ozturk, Hakan, Mocanu, S., Stefanescu, C., Ionescu, A., Talpes, Raluca, Sapte, Elena, Dina, Constantin, Surdu, Loredana, Bulbuc, Ionut, Medina, M. T., Medina, J., López-Soler, M., Martin-Oviedo, Carlos, Lowy-Benoliel, Alejandro, Maranillo, Eva, Martinez-Guirado, Tomas, Sañudo, Jose, Scola, Bartolome, Vazquez, Teresa, Arráez-Aybar, L. A., Conejo-Menor, J. L., Gonzáles-Gómez, C. C., Torres-García, A. J., Nasu, Hisayo, Chiba, Shoji, Gutierrez-Semillera, M., Paksoy, Yahya, Kalaycioglu, Ahmet, Yildirim, Mehmet, Ozyasar, Ali, Ozdogmus, Omer, Cakmak, Yusuf Ozgur, Verimli, Ural, Cavdar, Safiye, Yildizhan, Begum, Aktan Ikiz, Z. Asli, Ucerler, Hulya, Ozgur, Zuhal, Yilmaz, Seher, Demirtas, Abdullah, Mavili, Ertugrul, Hacialiogullari, Mehtap, Susar, Hatice, Arslan, Seda, Aycan, Kenan, Ozkaya, Vecihi, Pilmane, Mara, Boka, Sarmite, Ortug, Gursel, Ramirez, Carlos, Pascual-Font, Aran, Valderrama-Canales, Francisco, Kucukalic, Abdulah, Kapur, Eldan, Talovic, Elvira, Baca, Vaclav, Grill, Robert, Horak, Zdenek, Kachlik, David, Dzupa, Valer, Konarik, Marek, Knize, Jakub, Veleminsky, Petr, Smrzova, Tereza, Otcenasek, Michal, Chmelova, Jana, Kheck, Michal, Kheck, Sr., Michal, Cupka, Tomas, Hnatek, Lukas, van der Meijs, Floris, Cech, Pavel, Musil, Vladimir, Ozkan, H. Mustafa, Muratli, S. Kivanc, Tayefi, Hamid, Ergur, Ipek, Kiray, Amac, Toktas, Muhsin, Alkoc, Ozan, Acar, Tolgahan, Uzun, Ibrahim, Ozen, Oguz Asian, Aycicek, Abdullah, Alkoc, Ozan Alper, Unlu, Mehmet, Corumlu, Ufuk, Ikiz, Ihsaniye Coskun, Oygucu, I. Hakan, Sendemir, Erdogan, Kaner, Tuncay, Caglar, Veli, Eser, Olcay, Demir, Mehmet T., Iyigun, Omer, Pirzirenli, Gokhan, Kaya, Ahmet Hilmi, Aydin, Mennan Ece, Celik, Fahrettin, True, Hakan, Ozkaya, Sevket, Ergur, Bekir Ugur, Zeybek, Gulsah, Bacakoglu, Kadir, Tadjalli, Mina, Poostpasand, Aghdas, Mansouiri, Seid Hadi, Allahvaisi, Ozra, Soleimanirad, Jafar, Nikkhoo, Bahram, Nagato, Yasukazu, Haruki, Yasuo, Yazawa, Komazo, Okazaki, Tutomu, Haida, Munetaka, Imai, Yutaka, Peirouvi, Thmineh, Mahzad-Sadaghiani, Mehrzad, Noroozinia, Farahnaz, Siamak, Salami, Farjah, Gholamhosseine, Mola, Sima, Biegaj, Ewa, Skadorwa, Tymon, Pawlewicz, Konrad, Kapolka, Robert, Chachulska, Agata, Zabicka, Joanna, Krasowska, Aleksandra, Prusik, Alicja, Jaczewski, Grzegorz, Kolesnik, Adam, Taghavi, M. Mohsen, Alavi, S. Hasan, Moallem, S. Adel, Safikhani, Zahed, Panahi, Marzieh, Dabiri, Shahriar, Shekaari, Majid Asadi, Latorre, Rafael, Soria, Federico, Lopez-Albors, Octavio, Sarria, Ricardo, Ayala, Inacio, Serrano, Inma, Perez-Cuadrado, Enrique, Musienko, Vladimir, Tkachenko, Dmitry, Colakoglu, Neriman, Kus, Murat Abdulgani, Jalali, Mahdi, Nikravesh, Mohammad Reza, Moeen, Abbas Ali, Karimfar, Mohammad Hassan, Rafighdoost, Houshang, Mohammadi, Shabnam, Korneeva, Marina, Rafighdoust, Houshang, Lovasova, Kvetuse, Bolekova, Adriana, Kluchova, Darina, Sulla, Igor, Kapitonova, Marina Yurievna, Syed Ahmad Fuad, Syed Baharom, Jayakaran, Flossie, Shams, Ali Reza, Aghaee, Fereshteh, Baqer, Zohreh, Faroki, Mohamad, Das, Srijit, Kassim, Normadiah, Latiff, Azian, Suhaimi, Frihah, Ghafar, Norzana, Hlaing, Khin Pa Pa, Maatoq, Israa, Othman, Faizah, Kiray, Muge, Bagriyanik, Husnu Alper, Pekcetin, Cetin, Ozogul, Candan, Fidan, Mustafa, Suhaimi, Farihah, Sun, Fei, Sanchez-Margallo, Francisco, Gil, Francisco, Crisostomo, Verónica, Uson, Jesus, Ramirez, Gegorio, Turamanlar, Ozan, Kirpiko, Oguz, Haktanir, Alpay, Climent, Salvador, Losilla, Sergio, Climent, Maria, Sarikcioglu, Levent, Senol, Yesim, Yildirim, Fatos B., Utuk, Arzu, Kunicki, Jacek, Pasbakhsh, Parichehr, Omidi, Negar, Omidi, Hamed, Nazhvani, Fatemeh Dehghani, Ghalebi, Seyed Razi, Javan, Nima, Mohagery, Akrami, Bideskan, Ali Reza Ebrahimzadeh, Taheri, Mohammad Mehdi Hassanzadeh, Fazel, Ali Reza, Tiengo, Cesare, Macchi, Veronica, Stecco, Carla, Porzionato, Andrea, Mazzoleni, Franco, De Caro, Raffaele, Clemente, Alberto, Morra, Aldo, Greco, Pietro, Pavan, Piero, Natali, Arturo, Demir, Mehmet, Dokur, Mehmet, Acer, Niyazi, Mavi, Ayfer, Matveeva, Niki, Lazarova, Dobrila, Korneti, Kostandina, Jovevska, Svetlana, Jurkovik, Dragica, Papazova, Meri, Havasi, Masoumeh, Alboghobeish, Naeim, Savari, Ahmad, Salamat, Negin, Sharifi, Mozafar, Kwak, Hyun-Ho, Hu, Kyung-Seok, Kim, Gyoo-Cheon, Park, Bong-Soo, Kim, Hee-Jin, Sinav, Ahmet, Gulati, Adarsh K., Gulati, Nidhi K., Alshammary, Hussien, Nazhvani, Seifollah Dehghani, Vafafar, Amir, Esmaeilpour, Tahereh, Bahmanpour, Soghra, Elyasi, Leila, Monabbati, Ahmad, Ghanadi, M., Paryani, Mohammad Reza, Gilanpour, Hassan, Amirsam, Banino, Omaña, Rodrigo Elizondo, López, Santos Guzmán, De la Garza Castro, Oscar, Vega, Edgar Urrutia, Lopez, Santos Guzman, Talebpour, Freshteh, Golmohammadi, Rahim, Dashti, Golamreza, Atlasi, Mohammad Ali, Mehdizadeh, Mehdi, Bahadori, Mohammad Hadi, Joghataei, Mohammad Taghi, Hatami, Leili, Boroujeni, Mandana Beigi, Estakhr, Jasem, Esfandiary, Ebrahim, Marzban, Mohsen, Bakhtiary, Mehrdad, Modiry, Navid, Jafarpur, Mokhtar, Mofidpur, Hassan, Alavi, S. Hassan, Mahmoudian, Alareza, Taghavi, Mohmmad Mohsen, Jafarpour, Mokhtar, Mahmoudian, Ali Reza, Sanjarmousavi, Nasrin, Doassans, Ines, Sorrenti, Natalia, Decuadro, German, Saibene, Andres, Poumayrac, Marie, Laza, Sebastian, Almiron, Carina, Vergara, Maria Elena, Soria, Victor, Lasa, Sebastian, Perez, Adolfo, Castro, Gabriela, Maria, Ana Santa, Soleimani, Mansoureh, Katebi, Majid, Bakhshayesh, Masoomeh, Oner, Mithat, Halici, Mehmet, Yikilmaz, Ali, Guney, Ahmet, Turk, Yildirim, Edizer, Mete, Beden, Umit, Icten, Nihal, Afshar, Mohammad, Hasanzadeh Taheri, Mohammad Mehdi, Moalem, Adel, Golalipour, Mohammad Jafar, Tamizi, Azadeh, Ahi, Mohammad, Mohammadpour, Shahram, Maiery, Ardeshir, Acikel, Cengiz, Ulkur, Ersin, Karagoz, Huseyin, Celikoz, Bahattin, Bedi, Kuldip, Ginus, Partadiredja, Golalipoor, Mohammad Jafar, Mohammadi, Mohammad Reza, Jhand, Poya, Mansourian, Azad Reza, Hosseinpoor, Kanizreza, Keshtkar, Abbas Ali, Alsaffar, Raith, Balajadeh, Babak Kabiri, Ghafari, Soraya, Azarhosh, Ramin, Fazeli, Seyyed Amirhossein, Jahanshahi, Mehrdad, Gharravi, Annen Mohammad, Alicioglu, Banu, Karakas, Hakki Muammer, Harma, Ahmet, Yang, Hun-Mu, Won, Sung-Yoon, Lee, Jae-Gi, Lee, Ju-Young, Lee, Jeong-Yong, Kim, Yoo-Ri, Song, Wu-Chul, Koh, Ki-Seok, Hwang, Eu-Na, Choi, Hyun-Gon, Kim, Soon-Heum, Kim, Soo-Young, Hur, Mi-Sun, Ulucam, Enis, Celbis, Osman, Kim, Da-Hye, Hong, Hee-Suk, Kim, Hyun-Joo, Choi, Jong-Hoon, Park, Jong-Tae, Kim, Hyeon-Cheol, Abbasi, Hamed, Hosseinipanah, Seyed Mohammad, Hosseini, Mohammad, Amani, A., Ashrafi, H. R., Sadeghimehr, Mohsen, Kim, Hyun-Ju, Sheverdin, Vadim, Amani, Zahra, Ashrafi, Alireza, Ashrafi, Ali Reza, Javad, Hami, Kachap, Mokhtar Jafarpoor, Laza, Sebastián, Poumayrac, Marie Catherine, Doassans, Inés, Vergara, María Elena, Almirón, Carina, Soria, Víctor, Rivara, Alvaro, Sirilo, Angela, Freire, Diego, Cirillo, Angela, Veragara, Maria Elena, Krmek, Vlado, Krmek, Nikola, Jo-Osvatic, Ana, Nikolic, Vasilije, Radic, Radivoje, Tubbs, R. Shane, Loukas, Marios, Fogg, Quentin, Ashwood, Neil, Cilingiroglu, Serpil, Ozbakir, Cemal, Mazoochi, Tahereh, Sabanciogullari, Vedat, Gumus, Cesur, Erdil, F. Hayat, Cimen, Mehmet, Moodi, Hesam, Ghiasi, Fateme, Akbari, Asghar, Hami, Javad, Khazei, Majid, Haghparast, Elham, Mitsakis, Ioannis, Anastasiou, Aikaterini, Mitsakis, Menelaos, Sianou, Kyriaki, Hainoglou, Roxani, Francisco, Margarida, Mitsaki, Charikleia, Konstantinidi, Maria, Prapa, Stamatia, Leksan, Igor, Mrcela, Tomislav, Selthofer, Robert, Kermanian, Fatemeh, Mahmoudian, Alireza, Ahmadpoor, Mahmood Erfanian, Dalili, Naser, Elian, Amir Hossein, Moaiery, Ardesheer, Jamalpour, Zahra, Nourani, Mohammad Reza, Asgari, Alireza, Hassanzadeh Taheri, Mohammad Mehdi, Ebrahimzadeh, Alireza, Eftekharvaghefi, Seyed Hasan, Mohammadi, Abbas, Sheibani, Vahid, Nematollahi-Mahani, Seyed Noureddin, Latifpour, Mastafa, Deilami, Masood, Soroure-Azimzadeh, Behzad, Nabipour, Fatemeh, Najafipour, Hamid, Nakhaee, Nouzar, Yaghoobi, Mohammad, Eftekharvaghefi, Rana, Salehinejad, Parvin, Azizi, Hasan, Riasi, Hamid Reza, Nobakht, Maliheh, Asalgoo, Sara, Rahbar, Roshanak, Najafzadeh, Norooz, Moosavizadeh, Kazem, Ezzatabadypour, Massood, Majidi, Masoud, Malekpor-Afshar, Reza, Karimzade, Fariba, Hoseini, Mahmood, Bayat, Mohamad, Gorgi, Ali, Nezhadi, Akram, Bakhtiari, Mehrdad, Jazi, Homa Rasooli, Jafaryan, Maryam, Haghir, Hosein, Hosseini, Mahmood, Rahimi, Sadegh, Rassouli, Fatemeh Behnam, Gorji, Ali, Habibi, Aliasghar, Pouya, Fatemeh, Dabiri, Shahryar, Mousavi, A., Rajabalian, Saeed, Abolidokht, A., Khanlarkhani, Neda, Naderian, Homayoun, Berjis, Nezamedin, Namavar, Mohamad Reza, Talaei, Tahereh, Mazaheri, Zohreh, Monabati, Ahmad, Kosar, Mehmet Ilkay, Karacan, Kezban, Chegini, Hamidreza, Nikzad, Hossein, Ayhan, Egemen, Ustundag, Sinan, Akkin, Salih Murat, Ogut, Tahir, Rayegan, Parviz, Meibodi, Mohamad Ali Emami, Ghaem, Reza Montazer, Zargarpoor, Rosa, Eftekhar Vaghefi, Seyd Hasan, Moshkdanian, Ghazale, Poya, Fateme, Kohestani, Hamid, Abarghoeai, Roozbeh Rayegan, Abarghoeai, Parviz Rayegan, Eftekhar Vaghefi, Seyed Hasan, Mahmodi, Abolghasem Amir, Poraboli, Ali, Kohestani, Hamid Reza, Vaghefi, Raena Eftekhar, Eftekhar Vaghefy, Seyed Hasan, Vaghefy, Raena Eftekhar, Abarghoeai, Parviz Raygan, Saba, Mohamad, Gharravi, Anneh Mohammad, Javadnia, Fatemeh, Zhaleh, Mohsen, Nezhad, Dariush Bijan, Gholami, Mohammad Reza, Piagkou, Maria, Aikaterini, Vassiliki Kouki, Piagkos, Giannoulis, Douvetzemis, Stergios, Skandalakis, Panagiotis, Anagnostopoulou, Sophia, Papadopoulos, Nikolaos, Celik, H. Hamdi, Tatar, Ilkan, Tatar, Emel Cadalli, Mocan, Burce Ozgen, Sargon, Mustafa F., Denk, C. Cem, Rasoolijazi, Homa, Joghataie, Mohammad Taghi, Roghani, Mehrdad, Akkin, Salin Murat, Dinc, Gulten, Kurklu, Mustafa, Ozboluk, Sener, Komurcu, Mahmut, Koebke, Jürgen, Balioglu, Mehmet Bulent, Kaygusuz, Mehmet Akif, Bozkus, Ferdi Sefa, Korkmaz, Ozgur, Bayram, Sule Biyik, Can, Mehmet Ali, Nasiri, Ebrahim, Jafar-Kazemi, Koroush, Hosseini, Melina, Maghoul, Shahin, Soleimani, Mansooreh, Amini, Abdollah, Hassanzade, Mohamad Mahdi, Davari, Mohammad Hossein, Van Hoof, Tom, Gomes, Germano T., Audenaert, Emmanuel, Verstraete, Koenraad, Kerckaert, Ingrid, D’Herde, Katharina, Benninger, Brion, Hedley, Gil, Filipoiu, Florin Mihail, Tarta, Eugen, Enyedi, Mihali, Pantu, Cosmin, Stanciulescu, Razvan, Skobowiat, Cezary, Calka, Jaroslaw, Majewski, Mariusz, Rezaian, Maryam, Yaghoobfar, Akbar, Hamedi, Somayeh, and Shomali, T.

Published
2009
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40. Cooperative diversity for intervehicular communication: performance analysis and optimization

Author

Ilhan, Haci, Uysal, Murat, and Altunbas, Ibrahim

Subjects
Communications circuits -- Design and construction, Mobile communication systems -- Research, Wireless communication systems -- Research, System design -- Methods, Systems analysis -- Methods, Mathematical optimization -- Research, Wireless technology, System design, Business, Electronics, Electronics and electrical industries, Transportation industry
Published
2009

41. A 130 nm CMOS Receiver for Visible Light Communication.

Author

Ksack, Rifat, Yagan, Muhammed Yaser, Uysal, Murat, Pusane, Ali Emre, Baykas, Tuncer, Dundar, Gunhan, and Yalcinkaya, Arda Deniz

Abstract

Visible light communication (VLC) is an emerging technology that has been gaining attention over the last few years. Transmission of data at higher rates in a VLC system is mainly limited by the modulation bandwidth of the employed LED. To alleviate this limitation, equalization is frequently employed. This is usually achieved by either using discrete circuit elements or in digital form. In this paper, we present a power-efficient VLC receiver as a system-on-chip, implemented in 130 nm CMOS technology. The proposed receiver supports LEDs with different bandwidths thanks to the switchable equalizer. We tested the proposed receiver using phosphorescent white LEDs with different bandwidths on an experimental VLC link. For each tested LED, around 20 fold improvement in data rate was achieved compared to the original bandwidth of the LED. For the LED with a modulation bandwidth of 1.6 MHz, data rates of 32 Mbps and 50 Mbps at a BER of $10^{-2}$ were obtained at a distance of 2 meters without and with a blue filter, respectively. [ABSTRACT FROM AUTHOR]

Published
2022
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42. Multi-User Massive MIMO Visible Light Communications With Limited Pilot Transmission.

Author

Narmanlioglu, Omer and Uysal, Murat

Abstract

Visible light communication (VLC) building on the existing illumination infrastructure utilizes light emitting diode (LED) luminaries as wireless transmitters. To achieve data rates on the order of gigabits per second in VLC systems, multiple-input multiple-output (MIMO) transmission has been identified as a key technology. In this paper, we consider a centralized network architecture where the ceiling LED luminaries act as transmitter elements of a distributed massive MIMO VLC system. To obtain the full benefits of massive MIMO, channel state information must be available at the transmitter side. Downlink (DL) channel estimation in a massive MIMO system requires huge pilot overhead in DL as well as feedback overhead in uplink. This makes the implementation of massive MIMO system infeasible if not properly designed. In our study, we address the design of massive MIMO VLC systems with a limited number of DL pilot signals. We explore different DL pilot patterns (PPs) in frequency, time, and spatial domains where interpolation is performed to obtain the global channel matrix taking advantage of the indoor environment geometry and layout of luminaries. We then present data rate results for different DL PPs under the consideration of varying number of active user equipments through Monte-Carlo simulations. [ABSTRACT FROM AUTHOR]

Published
2022
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43. Coordinated Beamforming Design for Multi-User Multi-Cell MIMO VLC Networks.

Author

Naser, Shimaa, Bariah, Lina, Jaafar, Wael, Muhaidat, Sami, Al-Qutayri, Mahmoud, Uysal, Murat, and Sofotasios, Paschalis C.

Abstract

Inter-cell interference (ICI) and inter-user interference (IUI) constitute a major issue towards achieving the optimum spectral efficiency (SE) and energy efficiency (EE) performance in multi-cell visible light communication (VLC) networks. Hence, advanced multiple access techniques need to be leveraged in order to improve the provided service to the users of such interfering networks. To this end, the present contribution proposes the integration of coordinated beamforming (CB) with rate-splitting multiple access (RSMA) in multi-cell VLC systems. Specifically, we consider the design of beamformers for the common and private streams in a coordinated manner between different attocells, which is shown to provide efficient mitigation of the incurred interference. Additionally, the formulated optimization problem aims to minimize the sum of the mean squared error across all attocells in order to jointly determine the optimum receive filters and coordinated transmit beamformers for RSMA streams. In this context, we illustrate through extensive computer simulations, which are carried out in a realistic setup that assumes noisy channel state information acquisition, the distinct flexibility and robustness of CB-based RSMA in mitigating the incurred interference. Finally, the offered results demonstrate the superiority of CB-based RSMA in terms of achievable SE and EE performance in multi-cell VLC networks compared to the conventional CB-based space division multiple access counterpart. [ABSTRACT FROM AUTHOR]

Published
2022
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44. Quasi-orthogonal time-reversal space-time block coding for frequency-selective fading channels

Author

Mheidat, Hakam, Uysal, Murat, and Al-Dhahir, Naofal

Subjects
Functions, Orthogonal -- Analysis, Monte Carlo method -- Usage, Signal processing -- Methods, Digital signal processor, Business, Computers, Electronics, Electronics and electrical industries
Abstract

The time-domain equalization for quasi-orthogonal space-timeblock codes (QO-STBC) is investigated by using the inherent quasi-orthogonality to design low-complexity receivers. The diversity gains are presented for the proposed scheme through pairwise error probability (PEP) derivation and analysis, which are confirmed by Monte Carlo simulations.

Published
2007

45. AUTOMATIC ROAD DETECTION FROM ORTHOPHOTO IMAGES

Author

YİĞİT, Abdurahman Yasin and UYSAL, Murat

Subjects
Object-based,Automatic Road Detection,Classification,UAV,Road
Abstract

Aerialphotos and satellite images tell us about the land surface. It provides avariety of information such as particularly human-built objects such asbuildings, roads and bridges and the location and characteristics of thevegetation. With the exception of aerial photographs and satellite imagery, thecollection, evaluation, and updating of the required data with other datacollection methods is a time-consuming process and more costly. Data fromaerial photographs and satellite images have long been detected manually byconventional methods and by operators. The automatically of these detectionsincreases the speed of the project process and contributes to the reduction ofthe expenses spent. The projects carried out within the scope of the extractionand classification of objects are mostly concentrated on buildings and roads.Because roads and buildings; Due to the characteristic features such as havingsharp lines and easy determination of the geometric shape, the identificationof the detail lines in the objects is easier than determining the details ofother objects. Various object extraction and classification techniques are usedfor image analysis with semi and fully automatic approach methods based onimage processing techniques. In this study, aerial photographs of a certainarea of Afyon Kocatepe University Ahmet Necdet Sezer Campus were obtained byusing unmanned aerial vehicles (UAV). The raw data obtained were evaluated andthe object-based classification approach was used to automatic detection andclassify the roads of the university in the digital environment.

Published
2019

46. An efficient implementation of a maximum-likelihood detector for space-time block coded systems

Author

Uysal, Murat and Georghiades, Costas N.

Subjects
Communications technology, Telecommunication -- Research
Abstract

We investigate maximum-likelihood (ML) sequence estimation for space-time block coded systems without assuming channel knowledge. The quadratic form of the ML receiver in this case does not readily lend itself to efficient implementation. However, under quasi-static channel conditions, the likelihood function reduces to a simple form similar to the classical correlation receiver in matrix notation. It also allows the development of a recursive expression that can be easily implemented by a Viterbi-type algorithm with a reasonable complexity. Although the receiver is suboptimum for the nonstatic case, its performance is close to the optimum for a range of signal-to-noise ratios. Index Terms--Fading channels, maximum-likelihood (ML) sequence estimation, space-time block coding (STBC).

Published
2003

47. Infrastructure-to-Vehicle Visible Light Communications: Channel Modelling and Performance Analysis.

Author

Eldeeb, Hossien B., Elamassie, Mohammed, Sait, Sadiq M., and Uysal, Murat

Subjects
OPTICAL communications, VISIBLE spectra, COMMUNICATION models, MONTE Carlo method, RAY tracing
Abstract

Visible light communication (VLC) has emerged as a potential wireless connectivity solution for infrastructure-to-vehicle (I2V) communications. In this paper, we investigate the performance of I2V VLC systems with access points in the form of streetlights. Particularly, we consider a typical two-lane highway road where the light poles are located at both roadsides and uniformly separated from each other. Based on non-sequential ray tracing simulations, we first propose a closed-form path loss expression as a function of transceiver and infrastructure parameters. Then, we statistically analyze the path loss and derive a closed-form expression for its probability distribution function (PDF). Utilizing the derived PDF, we derive an approximate closed-form bit error rate (BER) expression. We confirm the accuracy of derived BER expression through comparison with Monte Carlo simulation results and demonstrate the effect of transceiver and infrastructure parameters such as receiver aperture, pole height, car height, lateral shift, and spacing between light poles on the BER performance. [ABSTRACT FROM AUTHOR]

Published
2022
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48. Event-Triggered Adaptive Handover for Centralized Hybrid VLC/MMW Networks.

Author

Narmanlioglu, Omer and Uysal, Murat

Subjects
*RADIO access networks, *OPTICAL communications, *ROAMING (Telecommunication), *MILLIMETER waves, *VISIBLE spectra, *DATA transmission systems
Abstract

Visible light communication (VLC) builds upon the dual use of LED-based lighting infrastructure for data transmission. It is particularly attractive for user-dense environments and mainly positioned as a complementary wireless access technology to radio-frequency (RF) counterparts. The practical implementation of hybrid light/radio access networks requires the design of efficient vertical and horizontal handover mechanisms to exploit their complementary features. In this paper, we propose an event-triggered adaptive handover mechanism for centralized hybrid VLC/millimeter wave (MMW) systems. Unlike distributed architectures where all the functionalities are deployed in each access point (AP), the centralized systems allow better optimization of network parameters due to awareness of global network view. The proposed handover mechanism takes advantage of this architecture and uses offset-enhanced signal-to-interference plus noise ratio levels of APs as performance metrics. To ensure balanced distribution of user equipment (UE) numbers between two underlying technologies, it auto-tunes the offset variables using rule-set based algorithms based on the number of connected UEs and data rates as inputs. Our results demonstrate that the proposed handover mechanism significantly improves hybrid system performance via adaptive tuning of AP selection parameter while minimizing signaling overhead. [ABSTRACT FROM AUTHOR]

Published
2022
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50. Effect of LED wiring and cabling topologies on visible light communication channels

Author

Safaraliev, Sadi, Farshad Miramirkhani, Uysal, Murat, Özyeğin University, Uysal, Murat, Safaraliev, Sadi, and Miramirkhani, Farshad

Subjects
Wiring, Optical receivers, Delays, Topology, Light emitting diodes, Communication cables, Lighting
Abstract

Due to copyright restrictions, the access to the full text of this article is only available via subscription. Visible light communication (VLC) is an emerging short-range wireless access technology. It involves the dual use of illumination infrastructure for communication purposes and builds upon the principle of modulating light emitting diodes (LEDs) at very high speeds that are not noticeable to the human eye. Although there has been a growing literature on VLC channel modeling, the existing works mainly overlook the effects of wiring and cabling topologies. Wiring topology refers to how LED chips are connected within the luminaire while cabling topology refers to how the luminaires are connected to the communication access point. In this paper, we adopt ray-tracing based VLC channel modeling approach and consider various cabling/wiring topologies. For each topology, we obtain channel impulse responses (CIRs) and quantify the impact of wiring and cabling delays. TÜBİTAK

Published
2018

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