New results on disturbance zeros of invertible linear multivariable systems

A new results concerning the definitions of disturbance zeros via the concept of minimal order system inverses is presented in this paper. These definitions are then used to develop a new computation algorithm for locating the positions of the ‘disturbance blocking zeros’ in linear multivariable systems. Assignment of disturbance blocking zeros at desired locations in the complex plane plays an important role in rejection of all measurable or un-measurable disturbances, which may affect at the outputs in steady state. Numerical examples are given to illustrate the main results of this paper.     

行为活动中团队合作学习的探索——基于数控铣削学习领域的案例探析

团队合作近来一直是企业、社会、学校非常关心的一个问题,可如何结合课程进行团队合作的学习,大部分陷于了口号与说教。数控铣削加工课程作为武汉职业技术学院数控专业核心课程之一,近年来一直以项目任务为目标,通过大量行为活动的工作学习过程,开展团队合作学习和探索,积累了丰富的经验。     

分层流体中弧立波的理论分析和符号运算研究

The study of solitary waves has been a subject highly popular and full of interest sinec Russell[1]first observed the solitary waves in a channel and the research on the internal solitary waves in stratified fluids is one of the branches of this subject.There are extensively internal solitary waves in the atmosphere,oceans.fjords and lakes.To study them is of academic and practical significance[2].Numerous investigators have made contributions since the theoretical work on internal solitary waves was initiated by Keulegan[3].Nevertheless,some problems remain still to be discussed,for example,the higher-order theories for one-dimensional internal solitary waves in stratified fluids of small depth,the two-dimensional internal solitary waves,the explanation of the experimental and the practical phenomena by means of theoretical analysis.In this thesis,we hope to gain an insight into the above three items by combining of theoretical analysis and symbolic computation.The following work has been completed.     

Taking the relational structure of fractions seriously: Relational reasoning predicts fraction knowledge in elementary school children

Understanding and using symbolic fractions in mathematics is critical for access to advanced STEM concepts. However, children and adults consistently struggle with fractions. Here, we take a novel perspective on symbolic fractions, considering them within the framework of relational structures in cognitive psychology, such as those studied in analogy research. We tested the hypothesis that relational reasoning ability is important for reasoning about fractions by examining the relation between scores on a domain-general test of relational reasoning (TORR Jr.) and a test of fraction knowledge consisting of various types of fraction problems in 194 s grade and 145 fifth grade students. We found that relational reasoning was a significant predictor of fractions knowledge, even when controlling for non-verbal IQ and fractions magnitude processing for both grades. The effects of relational reasoning also remained significant when controlling for overall mathematics knowledge and skill for second graders but was attenuated for fifth graders. These findings suggest that this important subdomain of mathematical cognition is integrally tied to relational reasoning and opens the possibility that instruction targeting relational reasoning may prove to be a viable avenue for improving children’s fractions skills.     

保护私有信息的统计量化规则挖掘

统计量化规则（SQ rule）在数据挖掘中拥有重要和有用的地位。尽管集中式挖掘SQ规则的算法已经存在,但是集中式算法不能简单应用到分布式环境中,尤其涉及到分布式环境中各方的私有信息保护的时候。考虑数据分布共享的多方,在不泄漏各自的私有信息的情况下,合作完成SQ规则的挖掘问题。该问题属于保护私有信息的数据挖掘（PPDM）研究领域的问题。基于3个PPDM的基本工具,包括安全求和、安全求平均和安全求频繁项集的集合等,提交2个算法,共同完成水平划分数据下的保护私有信息的SQ规则挖掘。其中,一个算法安全计算置信区间,该区间用来检验规则的重要性;另一个算法安全挖掘规则。最后,给出算法的正确性、安全性和复杂性分析。     

基于半导体量子点的量子计算的物理实现

利用半导体量子点导带中电子的自旋作为量子信息的载体,设计了量子计算的方案,该方案不需要利用量子位之间的相互作用,所有的操作只是单量子位的操作。     

六个组合恒等式的证明

利用组合计数理论、数列和级数知识，采用构造证明的方法给出并研究了六个组合恒等式，这些结果在其他学科中得到广泛的和深入的应用。     

利用滤波技术实现华中数控系统的EMC设计

结合华中数控系统,分析其电磁兼容性设计要求,利用滤波技术实现数控系统的电磁兼容性（EMC）设计,以保证数控机床在电磁环境较恶劣的工业现场长时间、高强度、连续性使用。     

基于有限元强度折减法的双孔并行隧道间距设计优化研究

研究双孔并行隧道双洞间距对隧道围岩稳定性的影响,根据有限元强度折减法数值模拟计算得到的不同线间距条件下的隧道安全系数和围岩及支护结构内力、位移、塑性区的结果分析,对嵩山隧道的线间距进行了优化设计,确定了最佳、最小线间距.     

一种基于快速数值技术的电磁场分析有限元算法

提出了一种用于三维电磁场有限元分析的数值技术,即与波阵法配合使用的目标区域定位(TRL)算子.首先对波阵法进行了分析,然后对TRL算子原理进行了详细论述,并讨论了TRL算子在非线性场合应用的可行性,指出其仍能够适用并保持原来的高效率.还介绍了TRL算子在采用矢量磁位函数有限元公式中的实现.最后给出了一个三维静磁场建模的算例,分别采用TRL算子和有限元软件FEMLAB.结果表明:与FEMLAB相比,TRL算子可以节省可观的计算机资源.