Now showing items 1-14 of 14

    • Analytic modeling of loss and cross-coupling in capacitive micromachined ultrasonic transducers 

      Bozkurt, A.; Degertekin, F. L.; Atalar, Abdullah; Khuri-Yakub, B. T. (IEEE, Piscataway, NJ, United States, 1998)
      The structural loss mechanism of capacitive micromachined ultrasonic transducer (cMUT) is investigated using finite element analysis and the normal mode theory. A single micromachined transducer membrane on an infinite ...
    • Classifying fonts and calligraphy styles using complex wavelet transform 

      Bozkurt, A.; Duygulu P.; Cetin, A.E. (Springer-Verlag London Ltd, 2015)
      Recognizing fonts has become an important task in document analysis, due to the increasing number of available digital documents in different fonts and emphases. A generic font recognition system independent of language, ...
    • CMUT array element in deep-collapse mode 

      Olcum, Semih; Yamaner F.Y.; Bozkurt, A.; Köymen, Hayrettin; Atalar, Abdullah (IEEE, 2011)
      Collapse and deep-collapse mode of operations have boosted the pressure outputs of capacitive micromachined ultrasonic transducers (CMUTs) considerably. In this work, we demonstrate a CMUT element operating in the deep-collapse ...
    • Conducting polymer composites of polypyrrole and polyindene 

      Bozkurt, A.; Akbulut, U.; Toppare, L. (Elsevier, 1996)
      Polypyrrole-polyindene composites were prepared via electrochemical methods. Two different approaches were utilized. In the first, the electro-initiated polymerization of indene on a platinum electrode was achieved at 2.0 ...
    • Deep-collapse operation of capacitive micromachined ultrasonic transducers 

      Olcum, S.; Yamaner F. Y.; Bozkurt, A.; Atalar, Abdullah (IEEE, 2011)
      Capacitive micromachined ultrasonic transducers (CMUTs) have been introduced as a promising technology for ultrasound imaging and therapeutic ultrasound applications which require high transmitted pressures for increased ...
    • Design and implementation of capacitive micromachined ultrasonic transducers for high power 

      Yamaner F.Y.; Ölçüm, Selim; Bozkurt, A.; Köymen, Hayrettin; Atalar, Abdullah (IEEE, 2011)
      Capacitive micromachined ultrasonic transducers (CMUTs) have a strong potential to compete piezoelectric transducers in high power applications. In a CMUT, obtaining high port pressure competes with high particle velocity: ...
    • Electronic properties of polypyrrole/polyindene composite/metal junctions 

      Bozkurt, A.; Ercelebi, C.; Toppare, L. (Elsevier, 1997)
      Junction properties between conducting polymer composites of polypyrrole/polyindene (PPy/PIn) with different conductivities and metals like Pt, Au, Al and In have been investigated. Rectifying junctions were observed for ...
    • An equivalent circuit for collapse operation mode of CMUTs 

      Olcum, Selim; Yamaner F.Y.; Bozkurt, A.; Köymen, Hayrettin; Atalar, Abdullah (IEEE, 2010)
      Collapse mode of operation of the capacitive mi-cromachined ultrasonic transducers (CMUTs) was shown to be a very effective way for achieving high output pressures. However, no accurate model exists for understanding the ...
    • An equivalent circuit model for transmitting capacitive micromachined ultrasonic transducers in collapse mode 

      Olcum, S.; Yamaner, F. Y.; Bozkurt, A.; Köymen, Hayrettin; Atalar, Abdullah (IEEE, 2011)
      The collapse mode of operation of capacitive micromachined ultrasonic transducers (CMUTs) was shown to be a very effective way to achieve high output pressures. However, no accurate analytical or equivalent circuit model ...
    • Frequency optimization in high intensity focused ultrasound 

      Yetik, H.; Arıyurek, Cemre; Bozkurt, A.; Ergun, A. S. (IEEE, 2014-09)
      In high intensity focused ultrasound (HIFU) the choice of transducer frequency depends on the target depth and tissue type. At high frequencies attenuation does not permit enough acoustical power to be transmitted to the ...
    • High Power CMUTs: design and experimental verification 

      Yamaner, F. Y.; Olcum, S.; Oguz, H. K.; Bozkurt, A.; Köymen, Hayrettin; Atalar, Abdullah (IEEE, 2012)
      Capacitive micromachined ultrasonic transducers (CMUTs) have great potential to compete with piezoelectric transducers in high-power applications. As the output pressures increase, nonlinearity of CMUT must be ...
    • Multi-scale directional-filtering-based method for follicular lymphoma grading 

      Bozkurt, A.; Suhre, A.; Çetin, A. Enis (Springer U K, 2014-08-07)
      Follicular lymphoma (FL) is a group of malignancies of lymphocyte origin that arise from lymph nodes, spleen, and bone marrow in the lymphatic system. It is the second most common non-Hodgkins lymphoma. Characteristic of ...
    • Optimizing CMUT geometry for high power 

      Yamaner F.Y.; Olcum, Selim; Bozkurt, A.; Köymen, Hayrettin; Atalar, Abdullah (IEEE, 2010)
      Capacitive micromachined ultrasonic transducers (CMUTs) have demonstratedvarious advantages over piezoelectric transducers. However, current CMUT designsproduce low output pressures with high harmonic distortions. Optimizing ...
    • Theory and analysis of electrode size optimization for capacitive microfabricated ultrasonic transducers 

      Bozkurt, A.; Ladabaum, I.; Atalar, Abdullah; Khuri-Yakub, B. T. (Institute of Electrical and Electronics Engineers, 1999-11)
      Theoretical analysis and computer simulations of capacitive microfabricated ultrasonic transducers indicate that device performance can be optimized through judicious patterning of electrodes. The conceptual basis of the ...