Members

{DETAYLI_AÇIKLAMA}

 

KİŞİLER KISA ACIKLAMA DETAYLI AÇIKLAMA
Faculty

Assoc. 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:



Assoc. 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 associate 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 3 patents, and co-authored 16 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

2014-                          Associate Professor at Department of Electrical and Electronics Engineering
                                  Middle East Technical University, Ankara, TURKEY.

2012                          Associate Professor Title from the Council of Higher Education

2011-2014                 Principle Investigator on TÜBİTAK 1001 project, ULTRAMEMS Research Group, Middle East Technical University, Ankara, TURKEY.

2010-2014                 Assistant Professor at Department of Electrical and Electronics Engineering
                                  Middle East Technical University, Ankara, TURKEY.

2010-2013                  Principle Investigator on TÜBİTAK 1001 project, ULTRAMEMS Research Group, Middle East Technical University, Ankara,TURKEY. 

2007-2010                  Principle Investigator on TÜBİTAK 1001 project, ULTRAMEMS Research Group, 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, “Method for Microfabrication of a Capacitive Micromachined Ultrasonic Transducer comprising a Diamond Membrane and a Transducer Thereof", Issue Date: April 16, 2013, Patent Number: 8,421,170.

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

F. Akyurek, and B. Bayram, "Digital output ROIC with single slope ADC for cooled infrared applications," Microsystem Technologies, published online, May 2016.

B. Bayram, "Radiation impedance study of a capacitive micromachined ultrasonic transducer by finite element analysis," J. Acoust. Soc. Am., vol. 138, pp. 614-623, Aug. 2015.

M. Maadi, and B. Bayram, "Custom integrated circuit design for ultrasonic therapeutic CMUT array," Microsystem Technologies, vol. 21, pp. 875-891, April 2015.

U.I. Can, and B. Bayram, "Plasma-activated direct bonding of patterned silicon-on-insulator wafers to diamond-coated wafers under vacuum," Diam. Relat. Mater., vol. 47, pp. 53-57, Aug. 2014.

A. M. Cetin, and B. Bayram, "Diamond-based capacitive micromachined ultrasonic transducers in immersion," IEEE Trans. Ultrason. Ferroelect. Freq. Contr., vol. 60, no. 2, pp. 414-420,
Feb. 2013.

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.

 

 

 

 

Undergraduate Students

 

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.