Kurum Yazarı "Hah, Dooyoung" İçin Listeleme
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All-polymer ultrasonic transducer design for an intravascular ultrasonography application
Hah, Dooyoung (TUBITAK SCIENTIFIC & TECHNICAL RESEARCH COUNCIL TURKEY, ATATURK BULVARI NO 221, KAVAKLIDERE, ANKARA, 00000, TURKEY, 2019)Intravascular ultrasonography (IVUS), a medical imaging modality, is used to obtain cross-sectional views of blood vessels from inside. In IVUS, transducers are brought to the proximity of the imaging targets so that ... -
AlN Piezoelectric Quad-Actuators for 2D Optical Micro Scanning
Hah, Dooyoung (TAYLOR & FRANCIS LTD, 2022)Piezoelectric actuation has been one of the frequent choices for optical micro scanning. In most of the cases, lead zirconate titanate (PZT) has been used as the piezoelectric material. However, PZT has a potential issue ... -
Analysis of electret-based vibration energy harvesting devices with curved-beam hinges
Hah, Dooyoung (SAGE Publications Ltd, 2023)Recently, vibration energy harvesting devices have gained growing interests. One of the main requirements for them is a broad bandwidth owing to stochastic spectral characteristics of the general vibration sources. Among ... -
Analysis of optical gyroscopes with vertically stacked ring resonators
Hah, Dooyoung (TUBITAK SCIENTIFIC & TECHNICAL RESEARCH COUNCIL TURKEYATATURK BULVARI NO 221, KAVAKLIDERE, ANKARA 00000, TURKEY, 2021)Without any moving part, optical gyroscopes exhibit superior reliability and accuracy in comparison to mechanical sensors. Microring-resonator-based optical gyroscopes emerged as alternatives for bulky conventional Sagnac ... -
Design of Mechanically Tunable Optical Filters with Microring Resonators
Hah, Dooyoung; Bordelon, John (IEEE, 2015)Design strategies for the mechanically tunable optical filters with microring resonators and comb-drive actuators are discussed. Electromechanical simulation results are combined with the electromagnetic analysis of the ... -
Design of Wide-Band Tunable Optical Filters with Cascaded Microring Resonators and Shaped-Finger Comb-Drive Actuators
Hah, Dooyoung (IEEE345 E 47TH ST, NEW YORK, NY 10017 USA, 2016)Utilizing the Vernier effect, series coupling of multiple microring resonators with different sizes is used to design a wide-band (free spectral range: 36 nm) tunable filter. For index modulators that shift the filter ... -
Electret vibration energy harvesters with symmetrically configured curved-beam hinges
Hah, Dooyoung (SPRINGER, 2024)For vibration energy harvesters, broadband power spectral characteristics are often desirable. One way of achieving broadband spectrum is to employ curved-beam hinges, utilizing their nonlinear spring characteristics. In ... -
Flexible and Ecofriendly Keypad Based on Paper and Pencil
Er, Şahane Firdevs; Kalabey, Nurefşan; Hah, Dooyoung (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2023)Pencil-on-paper electronics has gained growing interests as cost-effective, ecofriendly, flexible, and light-weight devices for various applications. In this letter, a flexible keypad employing pencil-on-paper capacitive ... -
Quasi-Static Operation of 2-Axis-Tilt Microscanners with AlN Piezoelectric Quad-Actuators
Hah, Dooyoung (IEEE, 2021)Aluminum nitride (AlN) started to draw attentions as a material for piezoelectric actuation owing to its CMOS process compatibility and safeness for biomedical applications. Due to its relatively low piezoelectric ... -
Respiration monitoring using a paper-based wearable humidity sensor, a step forward to clinical tests
Solak, İrfan; Gençer, Serife; Yıldırım, Beyza; Öznur, Emine; Hah, Dooyoung; Icoz, Kutay (ELSEVIER, 2023)Monitoring respiratory variables can provide valuable information for clinical applications and sport activities. Paper-based wearable respiration monitoring systems have great advantages and potential, they are ... -
RF MEMS variable attenuators with improved dB-linearity
Hah, Dooyoung (SPRINGER HEIDELBERG, 2023)A variable attenuator is one of the essential components in radio frequency (RF) systems, such as automatic gain control amplifiers and full-duplex systems. Variable attenuators based on microelectromechanical systems ... -
Shell-shaped active layers for omnidirectional organic photovoltaic cells
Hah, Dooyoung (SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS, 2022)For the employment of organic photovoltaic cells in wearable electronic systems, improvements in energy conversion efficiency and omnidirectionality (angular coverage) are highly appreciated. This study aims at those ... -
Symmetric Electret-Based Vibration Energy Harvesters with Curved-Beam Hinges
Hah, Dooyoung (Institute of Electrical and Electronics Engineers Inc., 2023)Broadband power spectral characteristics are desirable in vibration energy harvesters, and it can be achieved by employing curved-beam hinges, which exhibit forcedisplacement nonlinearity. Via numerical analysis by ...
