Umman Tümkaya

E-mail

umman@metu.edu.tr

Department

Department of Basic English

ORCID

0000-0001-7465-6270

Proceeding Towards Proficiency Tümkaya, Umman; Ağın, Başak (ODTÜ Yayınları, 2018-01-01)
Reading Strategies for the Intermediate Level Bıçak Hasso, Sevinç; Vecdi Özbilen, Münire; Tümkaya, Umman (METU Press, 2016-01-01)
Large-format voltage-tunable dual-color midwavelength infrared quantum-well infrared photodetector focal plane array Kaldirim, M.; Eker, S. U.; Arslan, Y.; Tümkaya, Umman; Beşikci, Cengiz (Institute of Electrical and Electronics Engineers (IEEE), 2008-05-01) We report a large-format (640 x 512) voltage-tunable quantum-well infrared photodetector (QWIP) focal plane array (FPA) for dual-color imaging in the midwavelength infrared (3-5 mu m) band. Voltage-tunable spectral respons...
Large format AlInAs-InGaAs quantum-well infrared photodetector focal plane array for midwavelength infrared thermal imaging Ozer, S.; Tümkaya, Umman; Beşikci, Cengiz (Institute of Electrical and Electronics Engineers (IEEE), 2007-09-01) We report the first large format (640 x 512) AlInAs-InGaAs quantum-well infrared photodetector (QWIP) focal plane array (FPA), and investigate the characteristics of AlInAs-InGaAs QWIPs both at pixel and FPA level. The mea...
Demonstration and performance assessment of large format InP-InGaAsP quantum-well infrared photodetector focal plane array Ozer, S.; Tümkaya, Umman; Asici, B.; Beşikci, Cengiz (Institute of Electrical and Electronics Engineers (IEEE), 2007-07-01) There have been various studies showing that InP-InGaAs quantum-well infrared photodetectors (QWIPs) are potential alternatives to AlGaAs-GaAs QWIPs in the long wavelength infrared (LWIR) band, especially for applications ...
Two different feedback procedures given to students’ writing Tümkaya, Umman (2003-01-01) This study aims to compare two teacher-written feedback procedures (total feedback via error codes vs. selective feedback via general comments) for the students' structural errors - grammar, vocabulary, mechanics. For this...

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