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Index-Calculus Yöntemi
In computational number theory, the index calculus algorithm is a probabilisticalgorithm for computing discrete logarithms. Dedicated to the discrete logarithm in where is a prime, index calculus leads to a family of algorithms adapted to finite fields and to some families of elliptic curves. The algorithm collects relations among the discrete logarithms of small primes, computes them by a linear algebra procedure…
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Ayrık Logaritma Problemi
, ‘de tanımlı sıfırdan farklı tamsayılar olsun. bilinmesine rağmen x’in çözülememesine ayrık logaritma problemi denir.
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Digital Transmission
Digital to Digital Line Coding Line coding dijital sinyali dijital sinyale çevirme işlemidir. Signal Element VS. Data Element Data Rate VS. Signal Rate Baseline Wandering – In decoding a digital signal, the receiver calculates a running average of the received signal power. This average is called the baseline.-The incoming signal power is evaluated against this…
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RF Propogation
Radio signals may propogate from transmitter to receiver in 3 main different modes Ground Wave Propogation Sky Wave Propogation Line of Sight Propagation Refraction – bending of microwaves by the atmosphere§ Velocity of electromagnetic wave is a function of thedensity of the medium§ When wave changes medium, speed changes§ Wave bends at the boundary between…
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Guided Media
Twisted-pair Cable Why is there twisting in twisted-pair cables? To prevent noise, signal interference and crosstalk during transmissions, twisting is introduced into conducting cables. Twisting reduces the strength of noise signals and cancels out external waves by moving a part of the noise in the direction of the signal and another part in the opposite direction. Since…
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DES Modes of Operation
Modes of operation https://www.ibm.com/docs/en/zos/2.4.0?topic=data-modes-operation To encipher or decipher data or keys, ICSF uses either the U.S. National Institute of Standards and Technology (NIST) Data Encryption Standard (DES) algorithm or the Advanced Encryption Standard (AES) algorithm. The DES algorithm is documented in Federal Information Processing Standard #46. The AES algorithm is documented in Federal Information Processing Standard…
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Olasılık Ders 1
Rastgele deney: Bir deney aynı şekilde tekrar edildiği halde farklı sonuçlar verebiliyorsa bu deneye rastgele deney denir. Örnek uzayı: Bir deneyde oluşabilecek tüm sonuçlardan oluşan kümeye “örnek uzayı” denir. S ile gösterilir. Para atma deneyinde örnek uzay: Zar atma deneyi: Bir telin kalınlığının ölçümü: Tellerin 10 mm’den daha ince olması imkansız ise x’in 10 ile…
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Permütasyon
N adet elemanın kaç farklı biçimde sıralanabileceği: N adet elemandan r adedinin kaç farklı biçimde sıralanabileceği: Tekrarlı permütasyon: Dairesel Permütasyon:
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Yöneylem Araştırması Ders 8
Projenin 25 haftada tamamlanma olaslığı nedir? Süre: 29 birim zamanVaryans( ): 1+4+1+5.444 = 11.444 %50-%38.10 = %11.9 olasılıkla proje 25 haftada tamamlanır. Projenin 32 haftada tamamlanma olasılığı nedir? %50+%31.33 = %81.33 olasılıkla proje 32 haftada tamamlanır. Proje 26 haftada tamamlanırsa 100 bin ₺ ödül kazanılacaktır. E faaliyeti için W firması düşünülmektedir. Ancak E faaliyeti J…
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Antennas
Antennas Radiation pattern In the field of antenna design the term radiation pattern (or antenna pattern or far-field pattern) refers to the directional (angular) dependence of the strength of the radio waves from the antenna or other source. Dipol In radio and telecommunications a dipole antenna or doublet is the simplest and most widely used class of antenna. The dipole is any one of a class of antennas producing a radiation pattern approximating that…
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Performance of a Network Examples
Bandwith Ex: A network with a bandwidth of 10 Mbps can pass only average of 12’000 frames per minute with each frame carrying an average of 10’000 bits. What is throughput of this network? Latency(Delay) Ex: What are the propagation time and transmission time for a 25kB message if the bandwidth is 16 bps? Assume…