在对膝上假肢使用者健侧和残侧的步态进行检测的基础上，对健、残侧在步态周期内的地面反力、下肢运动和时相对称性进行了对比和分析，时相对称性差是膝上截肢者步态的主要问题。
Based on the data obtained from gait tests, the differences of ground reaction forces and the movements of lower limbs between the sound side and prosthetic side of above knee amputee were analyzed.
该方法使用具有分段连续的线性分段来近似正弦函数曲线的第一象限部分，根据正弦曲线的对称性，构成完整的正弦曲线。
A digital frequency synthesizer without ROM look up table is presented, a piecewise linear interpolation scheme is used to approximate a sinusoid function.
自二十世纪七十年代以来，由于电力电子器件及其它非线性负荷在电网中大量的投入使用，使电网的非线性、不稳定性和不对称性日趋严重。
Since 1970s, the nonlinear, the instability and theunbalance of the voltage have become more and more serious due to the electronic device and other nonlinear load in power network.
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