Principle and architecture of parallel reconfiguration circuit for ternary optical computer

Reconfiguration is the key to produce an applicable ternary optical computer (TOC). The method to implement the reconfiguration function determines whether a TOC can step into applied fields or not. In this work, a design of the reconfiguration circuit based on field programmable gates array (FPGA) is proposed, and the structure of the entire hardware system is discussed.     

关联规则挖掘在超市销售系统中的应用及实现

超市购物篮分析是关联规则挖掘的典型应用领域,分析了关联规则在超市销售系统中的应用,然后提出了一种基于二维数组的关联规则挖掘实现算法,并根据算法开发实现了挖掘系统。通过模拟的超市销售数据进行试验表明,算法及所实现的系统是可行的、高效的。     

Rapid odor perception in rat olfactory bulb by microelectrode array

Responses of 302 mitral/tufted (M/T) cells in the olfactory bulb were recorded from 42 anesthetized freely breathing rats using a 16-channel microwire electrode array. Saturated vapors of four pure chemicals, anisole, carvone, citral and isoamyl acetate were applied. After aligning spike trains to the initial phase of the inhalation after odor onset, the responses of M/T cells showed transient temporal features including excitatory and inhibitory patterns. Both odor-evoked patterns indicated that mammals recognize odors within a short respiration cycle after odor stimulus. Due to the small amount of information received from a single cell, we pooled results from all responsive M/T cells to study the ensemble activity. The firing rates of the cell ensembles were computed over 100 ms bins and population vectors were constructed. The high dimension vectors were condensed into three dimensions for visualization using principal component analysis. The trajectories of both excitatory and inhibitory cell ensembles displayed strong dynamics during odor stimulation. The distances among cluster centers were enlarged compared to those of the resting state. Thus, we presumed that pictures of odor information sent to higher brain regions were depicted and odor discrimination was completed within the first breathing cycle.     

基于总和增量调制的比特流人工神经元和感知器的FPGA实现(英文)

为了解决传统的多比特数字方法在实现人工神经网络时所存在的硬件规模过于庞大的问题,提出了一种基于总和增量(ΣΔ)调制的比特流人工神经网络硬件实现方法.在FPGA中实现了比特流加法器、乘法器、阈值函数单元和全数字ΣΔ调制器,并采用这些比特流运算单元构建了比特流人工神经元.用实现逻辑函数功能和线性分类器的方法验证了比特流人工神经元的功能.基于比特流人工神经元的带预处理结构的比特流感知器被证明具有非线性分类的能力.比特流人工神经元实现所使用的FPGA资源表明比特流人工神经网络硬件实现技术可以显著地减少人工神经网络对硬件资源的需求.     

Incremental min-period retiming algorithm for FPGA synthesis based on influence of fan-outs

An improved linear-time retiming algorithm is proposed to incrementally optimize the clock period,especially considering the influence of the in-out degree of the critical combinational elements.Firstly,the critical elements are selected from all the critical combinational elements to retime.Secondly,for the nodes that cannot be performed with such retiming,register sharing is implemented while the path delay is kept unchanged.The incremental algorithm can be applied with the technology mapping to minimize the critical path delay and obtain fewer registers in the retimed circuit with the near-optimal clock period.Compared with Singh’s incremental algorithm,experiments show that the proposed algorithm can reduce the flip-flop count by 11% and look-up table(LUT) count by 5% while improving the minimum clock period by 6%.The runtime is also reduced by 9% of the design flow.     

分形在阵列天线中的应用

通过具体的举例与分析，运用图表与数据阐述了在阵列天线中使用分形单元的几个有利点：分形单元的小型化弥补了欧氏几何单元小型化所引起的阻抗不足以匹配，有利于减小互耦合，降低副瓣幅值，小型化也有利于实现线阵的压缩，同时通过增大单元数目，适当上中心距来增大其方向性系数。     

等价关系的判定及相关算法

等价关系是离散数学的一个重点问题,而等价关系的判定是一个难点。对于某个关系来说,判定它是否等价的过程比较繁琐。文中给出了判断等价关系的一个充要条件及用关系矩阵判断的方法,并在计算机上实现了具体算法。     

C数据类型解析

C语言近年来得到迅速推广。它功能丰富，应用面广。尤其指针部分，更是C语言的精华，也是C语言的难点。应用指针，可以使程序简洁、紧凑、高效。每个个学习和使用C语言的人，都应当深入地学习和掌握指针．     

Scanf对二维数组浮点数操作异常的研究

讨论了C语言中使用Scanf()对二维数组浮点数操作出现异常的情况,分析了异常产生的原因,给出多种的解决方法,并对每种方法进行了评价。     

麦克风阵列语音增强的二维FIR滤波器设计

当不能准确估计声源个数以及波达方向时,基于传统波束形成的语音增强的性能大为降低。根据手持通信设备的特点,提出一种利用麦克风阵列进行噪声及干扰抑制的方法。该方法采用具有扇形结构通带的二维FIR滤波器,利用楔形过渡带,实现指定角度内宽带语音的波束形成,用来抑制期望主瓣外的噪声和干扰。仿真实验表明了该滤波器的有效性。