Members

{KİŞİLER_KISA_ACIKLAMA}
{DETAYLI_AÇIKLAMA}

 

KİŞİLER KISA ACIKLAMA DETAYLI AÇIKLAMA
Faculty

Assist. Prof. Dr. Barış Bayram

Electrical and Electronics Engineering, C-105, Middle East Technical
University, Ankara 06800, TURKEY
Phone: +90 312 210 44 20
E-mail:

Assist. Prof. Dr. Barış Bayram

Electrical and Electronics Engineering, C-105,
Middle East Technical University, Ankara 06800, TURKEY
Phone: +90 312 210 44 20
E-mail:


Barış Bayram was born in Izmir, Turkey, in 1977. He received the B.S. degree in 2000 from Bilkent University, Ankara, Turkey; and the M.S. and Ph.D. degrees in 2002 and 2006, respectively, from Stanford University, Stanford, CA, all in electrical engineering.

From 2000 to 2006, he was a research assistant at Khuri-Yakub Ultrasonics Group, E. L. Ginzton Laboratory, Stanford University. He has pursued his academic career at Middle East Technical University (METU), Ankara. Currently he is an assistant professor in Electrical and Electronics Engineering at METU. He is the founder of ULTRAMEMS Research Group having graduate students from Electrical and Electronics Engineering, and Micro and Nanotechnology (MNT). The research activities of ULTRAMEMS extend over the full MEMS device development, including the microfabrication of prototypes in the state-of-the-art clean room of Middle East Technical University.

His research interests include design, fabrication, and characterization of capacitive micromachined ultrasonic transducers (CMUTs). He investigates the nonlinear operation regimes (collapsed and collapse-snapback) of CMUTs for high acoustic output performance and better crosstalk performance, and advanced diamond based MEMS. His current research mainly focuses on nanocrystalline diamond as a membrane material for microfabrication of CMUTs for high power applications under harsh operating conditions.

He has 2 patents, and co-authored 11 journal and 14 conference publications.

His teaching interests include semiconductors, analog and digital electronics, VLSI circuit design, and microfabrication methods.

He is a member of the Acoustical Society of America (ASA), Institute of Electrical and Electronics Engineers (IEEE), IEEE Ultrasonics, Ferroelectrics, and Frequency Control (UFFC), and Electrochemical Society (ECS).


RESEARCH INTERESTS
Design, fabrication, and characterization of Capacitive Micromachined Ultrasonic Transducers (CMUTs),Finite Element Modelling of MEMS Devices, Circuit Design, Semiconductors.

TEACHING INTERESTS

Finite Element Methods, Design and Fabrication of MEMS Devices, Circuit Design, Semiconductor Physics and Devices.

EDUCATION

2002-2006                 Ph.D. in Electrical Engineering, Stanford University, CA, USA. Field of study: Finite                                  Element Analysis, Ultrasonic Transducer Design. Thesis: "Finite Element Analysis of                                  Capacitive Micromachined Ultrasonic Transducers Beyond Conventional Operation."

2000-2002                 M.S. in Electrical Engineering, Stanford University, CA, USA.

1996-2000                 B.S. in Electrical Engineering, Bilkent University, Ankara, TURKEY.

1993-1996                 İzmir Science High School, İzmir, TURKEY.

1989-1993                 Bornova Anatolian High School, İzmir, TURKEY.

PROFESSIONAL EXPERIENCE

2011-                           Principle Investigator on TÜBİTAK 1001 project Diamond based Capacitive Ultrasonic Microthrusters, Budget: 343,020 TL, Duration: 3 years, ULTRAMEMS Research Group, METU MEMS Center, Middle East Technical University, Ankara, TURKEY.

2010-                          Assistant Professor at Department of Electrical and Electronics Engineering
                                  Middle East Technical University, Ankara, TURKEY.

2010-                           Principle Investigator on TÜBİTAK 1001 project Acoustic Crosstalk Reduced 2-D Capacitive Micromachined Ultrasound Transducer Arrays with Diamond Membranes, Budget: 332,477 TL, Duration: 3 years ULTRAMEMS Research Group, METU MEMS Center Middle East Technical University, Ankara,TURKEY. 

2007-2010                  Principle Investigator on TÜBİTAK 1001 project Therapeutic Capacitive Micromachined Ultrasound Transducers with Diamond Membranes, Budget: 339,953 TL, Duration: 3 years, ULTRAMEMS Research Group, METU MEMS Center, Middle East Technical University, Ankara,TURKEY. 

2007-2010                   Instructor at Department of Electrical and Electronics Engineering
                                  Middle East Technical University, Ankara, TURKEY.
2000-2006                  Research Assistant at Khuri-Yakub Ultrasonics Group, E. L. Ginzton Laboratory, Stanford University, CA, USA.

AWARDS & SCHOLARSHIPS

2011                  Young Scientists Award Programme (GEBIP) of The Turkish Academy of Sciences (TÜBA) in the field of Electrical and Electronics Engineering

1996-2000                  Full Scholarship in Bilkent University during undergraduate education


1996                           Honourable Mention in the International Physics Olympiad, Norway


1996                           7th degree all over Turkey in the University Entrance Examination

1993                           5th degree all over Turkey in the Science High School Examination

1992                           1st degree all over Turkey in Scholarship Examination

COMPUTER SKILLS

OS                                Windows, Linux/Unix.
Mathematics                Matlab, FEM Software ANSYS Multiphysics, FEM Software LS-DYNA.
Languages                  LabView, PASCAL, Intel Visual Fortran, Compaq Visual Fortran.
Applications                 HSPICE, LATEX, common Windows Applications.

PATENTS

B. Bayram, and B. T. Khuri-Yakub, “Acoustic Crosstalk Reduction Method for CMUTs in Immersion", Issue Date: June 29, 2010, Patent Number: 7,745,973.

B. Bayram, Ö. Oralkan, and B. T. Khuri-Yakub, “Method and System for Operating Capacitive
Membrane Ultrasonic Transducers", Issue Date: September 25, 2007, Patent Number: 7,274,623.

PEER-REVIEWED JOURNALS

B. Bayram, "Diamond-based capacitive micromachined ultrasonic transducers," Diam. Relat. Mater., vol. 22, no. 2, pp. 6-11, Feb. 2012.

B. Bayram, and H.S. Altinoluk, "Microfabrication of vacuum-sealed cavities with nanocrystalline and ultrananocrystalline diamond membranes and their characteristics," Diam. Relat. Mater., vol. 20, no. 8, pp. 1149-1154, Aug. 2011.

B. Bayram, "Fabrication of SiO2-stacked diamond membranes and their characteristics for microelectromechanical applications," Diam. Relat. Mater., vol. 20, no. 4, pp. 459-463, Apr. 2011.

B. Bayram, O. Akar, and T. Akin, "Plasma-activated Direct Bonding of Diamond-on-insulator wafers to Thermal Oxide grown Silicon Wafers," Diam. Relat. Mater., vol. 19, no. 11, pp. 1431-1435, Nov. 2010.

B. Bayram, M. Kupnik, G. G. Yaralioglu, Ö. Oralkan, A. S. Ergun, D. Lin, S. H. Wong, and
B. T. Khuri-Yakub, "Finite Element Modeling and Experimental Characterization of Crosstalk in
1-D CMUT Arrays," IEEE Trans. Ultrason. Ferroelect. Freq. Contr., vol. 54, no. 2, pp. 418-430,
Feb. 2007.

B. Bayram, G. G. Yaralioglu, M. Kupnik, A. S. Ergun, Ö. Oralkan, A. Nikoozadeh, and B. T. Khuri-
Yakub, "Dynamic analysis of capacitive micromachined ultrasonic transducers," IEEE Trans.
Ultrason. Ferroelect. Freq. Contr., vol. 52, no. 12, pp. 2270-2275, Dec. 2005.

B. Bayram, Ö. Oralkan, A. S. Ergun, E. Haeggström, G. G. Yaralioglu, and B. T. Khuri-Yakub,
"Capacitive micromachined ultrasonic transducer design for high power transmission," IEEE Trans.
Ultrason., Ferroelect., Freq. Cont., vol. 52, no. 2, pp. 326-339, Feb. 2005.

B. Bayram, E. Haeggström, G. G. Yaralioglu, and B. T. Khuri-Yakub, "A new regime for operating
capacitive micromachined ultrasonic transducers," IEEE Trans. Ultrason., Ferroelect., Freq. Cont.,
vol. 50, pp. 1184-1190, Sep. 2003.

Ö. Oralkan, B. Bayram, G. G. Yaralioglu, A. S. Ergun, M. Kupnik, D. T. Yeh, I. O. Wygant, and B. T. Khuri-Yakub, "Experimental Characterization of Collapse-Mode CMUT Operation," IEEE
Trans. Ultrason., Ferroelect., Freq. Cont., vol. 53, pp. 15131523, Aug. 2006.

G. G. Yaralioglu, A. S. Ergun, B. Bayram, E. Haeggström, and B. T. Khuri-Yakub, "Calculation
and Measurement of Electromechanical Coupling Coeffcient of Capacitive Micromachined Ultra-
sonic Transducers," IEEE Trans. Ultrason., Ferroelect., Freq. Cont., vol. 50, pp. 449-456, Apr.
2003.

Y. Huang, E. Haeggström, B. Bayram, X. Zhuang, A. S. Ergun, C. H. Cheng and B. T. Khuri-
Yakub, "Comparison of Conventional and Collapsed Region Operation of Capacitive Micromachined Ultrasonic Transducers," IEEE Trans. Ultrason., Ferroelect., Freq. Cont., vol. 53, pp. 1918-1933, Oct. 2006.

CONFERENCE PAPERS

B. Bayram, G. G. Yaralioglu, M. Kupnik, and B. T. Khuri-Yakub, "Acoustic Crosstalk Reduction
Method for CMUT Arrays," in Proc. IEEE Ultrason. Symp., 2006.

B. Bayram, M. Kupnik, G. G. Yaralioglu, Ö. Oralkan, D. Lin, X. Zhuang, A. S. Ergun, A. F. Sar-
ioglu, S. H. Wong, and B. T. Khuri-Yakub, "Characterization of Cross-Coupling in Capacitive
Micromachined Ultrasonic Transducers," in Proc. IEEE Ultrason. Symp., 2005.

B. Bayram, G. G. Yaralioglu, A. S. Ergun, Ö. Oralkan, and B. T. Khuri-Yakub, "Dynamic FEM
Analysis of Multiple CMUT Cells in Immersion," in Proc. IEEE Ultrason. Symp., 2004, pp.
252-255.

B. Bayram, E. Haeggström, A. S. Ergun, G. G. Yaralioglu and B. T. Khuri-Yakub, "Dynamic
Analysis of CMUTs in Different Regimes of Operation," in Proc. IEEE Ultrason. Symp., 2003,
pp. 481-484.

B. Bayram, G. G. Yaralioglu, and B. T. Khuri-Yakub, "Influence of the Electrode Size and
Location on the Performance of a CMUT," in Proc. IEEE Ultrason. Symp., 2001, pp. 949-952.

A. Nikoozadeh, B. Bayram, G. G. Yaralioglu, and B. T. Khuri-Yakub, "Analytical Calculation
of Collapse Voltage of CMUT Membrane," in Proc. IEEE Ultrason. Symp., 2004, pp. 256-259.

G. G. Yaralioglu, B. Bayram, and B. T. Khuri-Yakub, "Finite Element Analysis of CMUTs:
Conventional vs. Collapse Operation Modes," in Proc. IEEE Ultrason. Symp., 2006.

G. G. Yaralioglu, B. Bayram, A. Nikoozadeh, and B. T. Khuri-Yakub, “Finite element modeling of capacitive micromachined ultrasonic transducers,” Proc. SPIE, vol. 5750, 77 (2005), pp. 77-86.

Ö. Oralkan, S. Hansen, B. Bayram, G. G. Yaralioglu, A. S. Ergun, B. T. Khuri-Yakub, "High-
Frequency cMUT Arrays for High-Resolution Medical Imaging," in Proc. IEEE Ultrason. Symp.,
2004.

Ö. Oralkan, S. Hansen, B. Bayram, G. G. Yaralioglu, A. S. Ergun, B. T. Khuri-Yakub, "CMUT
Ring Arrays for Forward-Looking Intravascular Imaging," in Proc. IEEE Ultrason. Symp., 2004.

Y. Huang, E. Haeggström, B. Bayram, X. Zhuang, A. S. Ergun, C. H. Cheng and B. T. Khuri-
Yakub, "Collapsed Regime Operation of Capacitive Micromachined Ultrasonic Transducers based
on Wafer-bonding Technique," in Proc. IEEE Ultrason. Symp., 2003, pp. 1161-1164.

G. G. Yaralioglu, A. S. Ergun, B. Bayram, T. Marentis, and B. T. Khuri-Yakub, "Residual
Stress and Young's Modulus Measurement of Capacitive micromachined Ultrasonic Transducer
Membranes," in Proc. IEEE Ultrason. Symp., 2001, pp. 953-956.

M. Kupnik, A. S. Ergun, G. G. Yaralioglu, B. Bayram, Ö. Oralkan, S. H. Wong, D. Lin, and
B. T. Khuri-Yakub, "Finite Element Analysis of Fabrication Related Thermal Effects in Capacitive
Micromachined Ultrasonic Transducers," in Proc. IEEE Ultrason. Symp., 2006.

S. H.Wong, I. O. Wygant, D. T. Yeh, X. Zhuang, B. Bayram, M. Kupnik, Ö. Oralkan, A. S. Ergun,
G. G. Yaralioglu, and B. T. Khuri-Yakub, "Capacitive Micromachined Ultrasonic Transducer
Arrays for Integrated Diagnostic/Therapeutic Catheters," in AIP Conference Proc., Vol. 829, pp.
395-399, 2006.

 

 
Graduate Students

Serra Altınoluk

Electrical and Electronics Engineering D-225, Middle East Technical
University, Ankara 06800, TURKEY
Phone: +90 312 210 4584
E-mail:


Serra Altınoluk

Electrical and Electronics Engineering, D-225,  Middle East Technical University, Ankara 06800, TURKEY
Phone: +90 312 210 4584
E-mail:  

Serra Altınoluk was born in Mersin, Turkey, in 1983. She received the B.S. and M.S. degree in 2005 and 2007 from Mersin University, in Mersin, Turkey in Electrical Engineering, and currently she continues her education at METU as a Ph.D. candidate.

Work Experience

She has worked as Project Engineer at Pegas.

Research Interests

Capacitive micromachined ultrasonic transducers(CMUTs) have great advantages for therapeutic applications in medicine because of their high acoustic output pressure and ease of fabrication in MEMS technology. In this work, we present the microfabrication of novel CMUTs based on diamond membranes for the first time in literature. The acoustic output pressure of the novel CMUTs will be characterized using the ultrasonic acrylic tank with a 1-20 MHz hydrophone.

Publications

1) B. Bayram, and H.S. Altinoluk, "Microfabrication of vacuum-sealed cavities with nanocrystalline and ultrananocrystalline diamond membranes and their characteristics," Diam. Relat. Mater., vol. 20, no. 8, pp. 1149-1154, Aug. 2011.

 

Serdar Görümlü

Electrical and Electronics Engineering D-225, Middle East Technical
University, Ankara 06800, TURKEY
Phone: +90 312 210 4584
E-mail:

 

Serdar Görümlü

Electrical and Electronics Engineering, D-225,  Middle East Technical University, Ankara 06800, TURKEY
Phone: +90 312 210 4584
E-mail:

Serdar Görümlü was born in Balıkesir, Turkey, in 1984. He received the B.S. degree in 2008 from Süleyman Demirel University, Isparta, Turkey in Mechanical Engineering.

Work Experience

From 2008 to 2009, he had worked as Project Engineer at Bias Engineering. He had used several  Data Acquisition  and signal measurement  systems in his projects.


Research Interests


The experimental characterization of MEMS based ultrasound transducers in terms of electrical, structural and thermal features is very important for the novel transducer designs to be realized. He works on experimental accuracy, limitations of the used measurement method and variations in the design expectations observed in the actual transducer.

 

 

Mohammad Maadi

Electrical and Electronics Engineering D-225, Middle East Technical
University, Ankara 06800, TURKEY
Phone: +90 312 210 4584
E-mail:maadi.mohammad@gmail.com

Mohammad Maadi

Electrical and Electronics Engineering, D-225, Middle East Technical University, Ankara 06800, TURKEY
Phone: +90 312 210 4584
E-mail: maadi.mohammad@gmail.com

Mohammad Maadi was born in Macoo, Iran, in 1985. He received B.S. degree in 2007 from Azad University, Urmia, Iran in Electrical and Electronics Engineering, and now he continues his education at METU in Electrical and Electronics Engineering as a M.S. student.

Research Interests

His research interests are integrated circuit design for MEMS devices.

 

 

Undergraduate Students

Umut Kaya

Electrical and Electronics Engineering D-225, Middle East Technical
University, Ankara 06800, TURKEY
Phone: +90 312 210 4584


E-mail: umutkaya.metu@gmail.com

 

 


Umut Kaya
Electrical and Electronics Engineering, D-225,  Middle East Technical University, Ankara 06800, TURKEY
Phone: +90 312 210 4584
E-mail: umutkaya.metu@gmail.com 

Umut Kaya was born in Ankara, Turkey, in 1990. He is currently enrolled as an undergraduate student in Electrical and Electronics Engineering in Middle East Technical University, Ankara, Turkey.

 

 

 

Hasan Doğan Gavcar

Electrical and Electronics Engineering D-225, Middle East Technical
University, Ankara 06800, TURKEY
Phone: +90 312 210 4584


E-mail: hgavcar@gmail.com

 

Hasan Doğan Gavcar

Electrical and Electronics Engineering, D-225,  Middle East Technical University, Ankara 06800, TURKEY
Phone: +90 312 210 4584
E-mail: hgavcar@gmail.com 

Hasan Doğan Gavcar was born in Muğla, Turkey, in 1989. He is currently enrolled as an undergraduate student in Electrical and Electronics Engineering in Middle East Technical University, Ankara, Turkey.

İmre Özbay

Electrical and Electronics Engineering D-225, Middle East Technical
University, Ankara 06800, TURKEY
Phone: +90 312 210 4584


E-mail: ozbayimre@gmail.com

 

İmre Özbay

Electrical and Electronics Engineering, D-225,  Middle East Technical University, Ankara 06800, TURKEY
Phone: +90 312 210 4584
E-mail: ozbayimre@gmail.com 

İmre Özbay was born in Iowa, USA, in 1991. He is currently enrolled as an undergraduate student in Electrical and Electronics Engineering in Middle East Technical University, Ankara, Turkey.

Çağlar Yeşilyurt

Electrical and Electronics Engineering D-225, Middle East Technical
University, Ankara 06800, TURKEY
Phone: +90 312 210 4584


E-mail: caglaryesilyurt@gmail.com

 

 

 

Çağlar Yeşilyurt

Electrical and Electronics Engineering, D-225,  Middle East Technical University, Ankara 06800, TURKEY
Phone: +90 312 210 4584
E-mail: caglaryesilyurt@gmail.com 

Çağlar Yeşilyurt was born in Malatya, Turkey, in 1991. He is currently enrolled as an undergraduate student in Electrical and Electronics Engineering in Middle East Technical University, Ankara, Turkey.

 

Cem Ergören

Electrical and Electronics Engineering D-225, Middle East Technical
University, Ankara 06800, TURKEY
Phone: +90 312 210 4584


E-mail: cemergoren@gmail.com

 

Cem Ergören

Electrical and Electronics Engineering, D-225,  Middle East Technical University, Ankara 06800, TURKEY
Phone: +90 312 210 4584
E-mail: cemergoren@gmail.com 

Cem Ergören was born in Ankara, Turkey, in 1991. He is currently enrolled as an undergraduate student in Electrical and Electronics Engineering in Middle East Technical University, Ankara, Turkey.

 

 

Adil Adilli

Electrical and Electronics Engineering D-225, Middle East Technical
University, Ankara 06800, TURKEY
Phone: +90 312 210 4584


E-mail: adilliadil14@gmail.com

 

Adil Adilli

Electrical and Electronics Engineering, D-225,  Middle East Technical University, Ankara 06800, TURKEY
Phone: +90 312 210 4584
E-mail: adilliadil14@gmail.com 

Adil Adilli is currently enrolled as an undergraduate student in Electrical and Electronics Engineering in Middle East Technical University, Ankara, Turkey.

 

 

Berker Peköz

Electrical and Electronics Engineering D-225, Middle East Technical
University, Ankara 06800, TURKEY
Phone: +90 312 210 4584


E-mail: pekoz.berker@metu.edu.tr

 

Berker Peköz

Electrical and Electronics Engineering, D-225,  Middle East Technical University, Ankara 06800, TURKEY
Phone: +90 312 210 4584
E-mail: pekoz.berker@metu.edu.tr 

Berker Peköz is currently enrolled as an undergraduate student in Electrical and Electronics Engineering in Middle East Technical University, Ankara, Turkey.

AWARDS & SCHOLARSHIPS

2011                 Awarded outstanding success scholarship by Turkish Prime Ministery for ranking 17. at The Student Selection Examination in Turkey (1.7M+ applicants)

2011                  Awarded outstanding success scholarship by Turk Egitim Vakfi(Turkish Educational Foundation) (2K applicants who placed at least 2000. in various types of rankings in The Student Selection Examination)

2011                  Member of MODSIM (Modeling and Simulation Club), METU Robotics Society, AEGEE(European Students’ Forum)