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Down Call vs. Up Call

Down Call User code(unprivileged) enters to kernel with trap(interrupt). Up Call Kernel(privileged) enters to user code with IPC(Interprocess ...

Testing Methods

These are currently popular methods to test software. Fuzz Testing Input massive invalid, unexpected, or random data(Fuzz) to find errors or ...

Euclid’s Algorithm

Euclid’s(Euclidean) Algorithm Algorithm to find GCD of two large numbers GCD(N1, N2), suppose that N1 is larger than N2 N1 = N2 * q1 + r1   ...

Deprecated APIs

Deprecated As Android Versions keep being updated, many APIs and their methods are being revised. Even though those API’s methods get ...

FDMA, TDMA, and CDMA

FDMA (Frequency Division Multiple Access) Vary frequencies for each user. If number of users increases, it becomes complicated. TDMA (Time ...