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Building an equivalent model of small and mediumsized hydropower generator group is a practical method carried out for dynamic analysis of water electricity grid. Excitation and governor system have prominent influences on the precision of the equivalent model. This paper presents a method to build a dynamic equivalent model of hydropower generator units containing excitation and governing system,...
This paper gives a counter example of Theorem 5.40 on Weilʼs multiplicative character sum in the book “Finite Fields” by Rudolf Lidl and Harald Niederreiter. The counter example shows that Theorem 5.40 is incorrect.
This paper presents the first results on the diffusion properties of KATAN32 [1] Block Cipher accepting a key of 80 bits, a block length of 32 bits and a round number of 254. By using the symbolic computation software Mathematica 7.0, this paper gets the algebraic expressions of the internal state bits of KATAN32 with a reduced round number as the Boolean functions of the plaintext bits and the key...
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