Isotope independent determination of PET/CT modulation transfer functions from phantom measurements on spheres

study of hash functions based on chaotic maps

توابع درهم نقش بسیار مهم در سیستم های رمزنگاری و پروتکل های امنیتی دارند. در سیستم های رمزنگاری برای دستیابی به احراز درستی و اصالت داده دو روش مورد استفاده قرار می گیرند که عبارتند از توابع رمزنگاری کلیددار و توابع درهم ساز. توابع درهم ساز، توابعی هستند که هر متن با طول دلخواه را به دنباله ای با طول ثابت تبدیل می کنند. از جمله پرکاربردترین و معروف ترین توابع درهم می توان توابع درهم ساز md4, md...

Modulation transfer functions of fractal layers

Transmission characteristics of layers that contain fractal aggregates are investigated. In particular, the modulation transfer functions of these layers are studied in comparison with the case of uniformly dispersed particles. The effects of aggregation type (fractal dimension) and aggregate size are discussed.

Comment on "Temporal modulation transfer functions in patients

Shannon [I. Acoust. Soc. Am. 91, 2156-2164 (1992) ] reports a strong decrease of modulation detection thresholds with cochlear implant patients for an increase of the stimulus level. His conclusion that this result differs from the findings for acoustical stimulation in normalhearing subjects needs some clarification. His statement about acoustic stimulation is based on modulation detection mea...

Second-order temporal modulation transfer functions.

Detection thresholds were measured for a sinusoidal modulation applied to the modulation depth of a sinusoidally amplitude-modulated (SAM) white noise carrier as a function of the frequency of the modulation applied to the modulation depth (referred to as f'm). The SAM noise acted therefore as a "carrier" stimulus of frequency fm, and sinusoidal modulation of the SAM-noise modulation depth gene...

Spectro - Temporal Modulation Transfer Functions and Speech