从观摩高中英语优质课,看高中英语教师的角色转换     

朱义胜 《中国校外教育(理论)》2011,(7):32-32,168

高中英语新课程实施以来,广大英语教师认真贯彻新课程理念,充分利用教学资源,优化教学环境,旨在提高教学效率,在新课程改革实践中做出不懈的努力。从明光中学张璐老师新颖的上课模式,来探讨高中英语教师在新课程大背景下,如何转变角色,提高教学效果。  相似文献   

基于自适应双正交局部离散余弦变换的直接序列扩频通信干扰抑制技术     

朱丽平  胡光锐  朱义胜 《上海大学学报(英文版)》2005,9(2):139-142

A novel time-frequency domain interference excision technique is proposed. The technique is based on adaptive biorthogonal local discrete cosine transform (BLDCT). It uses a redundant library of biorthogonal local discrete cosine bases and an efficient concave cost function to match the transform basis to the interfering signal. The main advantage of the algorithm over conventional transform domain excision algorithms is that the basis functions are not fixed but can be adapted to the time-frequency structure of the interfering signal. It is well suited to transform domain compression and suppression of various types of interference. Compared to the discrete wavelet transform (DWT) that provides logarithmic division of the frequency bands, the adaptive BLDCT can provide more flexible frequency resolution. Thus it is more insensitive to variations of jamming frequency. Simulation results demonstrate the improved bit error rate (BER) performance and the increased robustness of the receiver.  相似文献   

平面螺旋电感参数的计算和仿真研究     

齐立荣  李海波  朱义胜 《林区教学》2007,(2)

电感作为电路的三大基础性元件之一,其片式化、薄膜化发展十分重要。常用的平面螺旋电感有方形的、六边形的、八边形的、还有圆形的。介绍了方形平面螺旋电感的物理参数的计算及仿真,对理论计算值和试验测量值进行比较,从而验证该种计算方法的可行性,并且分析了产生误差的原因。  相似文献   

基于调制重叠双正交变换的扩频通信非正交型窄带干扰抑制     

朱丽平  胡光锐  赵海波  朱义胜 《上海大学学报(英文版)》2005,9(3):237-240

Traditional lapped transform domain excision techniques obtain good performance at the expense of increased processing delay. Extension of transform domain filtering techniques to the lapped biorthogonal transform domain can help solve the problem. By incorporating biorthogonality into the lapped transforms, more flexibility is obtained in the design of windows. Thus transform bases with better stopband attenuation can be generated by designing windows, but not by increasing the overlapping factor. In this paper, a new modulated lapped biorthogonal transform (MLBT) with optimized windows is introduced for efficient compression of multi-tone interfering signal energy. The bit error rate (BER) performance of the receiver employing the proposed MLBT excision technique is analyzed and compared with that of the lapped transform domain excision-based receivers. Simulation results demonstrate the improved performance and increased robustness of the proposed technique.  相似文献