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排序方式: 共有231条查询结果,搜索用时 15 毫秒
1.
为探讨双循环半群上的同态核,从双循环半群上的同余关系出发,讨论双循环半群关于这类同余的交做成的商群,刻画了这种商群的具体元素,给出双循环半群到整数加法半群的同态映射.结果证明双循环半群上的同态核是最小群同余,且这类特殊同余的交也是最小群同余. 相似文献
2.
在电子对抗领域,利用FPGA产生伪随机序列模拟噪声源的方法,可为实现各种噪声干扰带来便利。文中设计了基于混合同余法和中心极限定理产生随机噪声的FPGA实现方法。算法上对传统混合同余法进行了简化,避免了FPGA实现时大量的乘除运算。测试结果表明,该方法不仅有效可行,且简捷高效,生成的伪随机数具有周期、均值、方差等关键参数灵活可控,概率分布类型可变的特点,可为各种噪声干扰提供不同的噪声样本。 相似文献
3.
针对模乘运算的模超过一半整数位会发生算术溢出,不使用高精度运算就无法处理的问题,提出一种利用同余关系缩小乘积的模乘算法。通过将整数分解成两位数,按照两位数乘法的原理,将高位部分乘积用同余关系缩小,避免了乘法运算过程的算术溢出。结果表明,该方法可以将64位整数为基础的模乘运算的模扩大到62位。 相似文献
4.
目的是通过模糊集理论研究BCI-代数的余模糊理想的性质。应用余模糊理想,引入了BCI-代数的一个同余关系,进而得到了BCI-代数的一个商代数,并且证明了商代数也是一个BCI-代数。 相似文献
5.
现有商空间模型中论域结构一般被指定为拓扑结构,问题的粒度由等价关系唯一地确定。当论域结构由拓扑结构变成应用广泛的代数结构时,引入同余关系的概念,系统地论证了两个重要结论在基于代数结构的商空间模型中依然成立,即全体同余关系构成的完备半序格和保假,保真原理的存在性。而当确定问题粒度的等价关系不是一个同余关系时,对偶地定义了上(下)同余与上(下)商,简捷地证明了它们的存在性并得出了一些重要性质,为商空间的合成与分解提供了理论依据。最后以纠错码进行传输的路由选择算法为实例,分析了基于代数结构的商空间模型在网络安全传输过程中的应用。从结构上扩展了现有商空间模型,为商空间理论与代数理论的结合提供了基础。 相似文献
6.
传统文本聚类方法只适合处理静态样本,且时间复杂度较高。针对该问题,提出一种基于簇相合性的文本增量聚类算法。采用基于词项语义相似度的文本表示模型,利用词项之间的语义信息,通过计算新增文本与已有簇之间的相合性实现对文本的增量聚类。增量处理完部分文本后,对其中错分可能性较大的文本重新指派类别,以进一步提高聚类性能。该算法可在对象数据不断增长或更新的情况下,避免大量重复计算,提高聚类性能。在20 Newsgroups数据集上进行实验,结果表明,与k-means算法和SHC算法相比,该算法可减少聚类时间,提高聚类性能。 相似文献
7.
Although the U.S. child-centered approaches of Garry Landreth and Louise Guerney have the same principles and practice skills as nondirective play therapy as practiced by therapists trained at the University of York, there are a few differences in their approach. Therapists’ practice of “congruence” is actively encouraged for York-trained therapists but not for Landreth and Guerney-trained therapists. The theoretical and practice rationales for expressing congruence that underlie the York approach are examined here, as well as potential pitfalls. Examples of therapists and parents verbally expressing their congruent feelings in therapy are given from both play therapy and filial therapy practice. Special attention is paid to the need for and uses of congruence when helping children and young people who were maltreated. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
8.
引入了Clifford半群K的诣零扩张S上同余对(δ,ω)的概念,证明了S上的任何同余σ都可由S的一个同余对(δ,ω)唯一表示.同时,还证明了映射Γ∶σ→(σQ,σk)为S上的所有同余集合到S的所有同余对集合的保序双射. 相似文献
9.
Reports an error in "Effects of interest–major congruence, motivation, and academic performance on timely degree attainment" by Jeff Allen and Steve Robbins (Journal of Counseling Psychology, 2010[Jan], Vol 57[1], 23-35). The link to the supplemental material was incorrect. The correct link is provided in the erratum. (The following abstract of the original article appeared in record 2010-00483-007.) Using longitudinal student data from 15 four-year (n = 3,072) and 13 (n = 788) two-year postsecondary institutions, the authors tested the effects of interest–major congruence, motivation, and 1st-year academic performance on timely degree completion. Findings suggest that interest–major congruence has a direct effect on timely degree completion at both institutional settings and that motivation has indirect effects (via 1st-year academic performance). The total effects of both interest–major congruence and motivation on timely degree completion underscore the importance of both constructs in understanding student adjustment and postsecondary success. Implications for theory and counseling practice are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
10.
Humphreys Glyn W.; Wulff Melanie; Yoon Eun Young; Riddoch M. Jane 《Canadian Metallurgical Quarterly》2010,36(3):659
Two experiments are reported that use patients with visual extinction to examine how visual attention is influenced by action information in images. In Experiment 1 patients saw images of objects that were either correctly or incorrectly colocated for action, with the objects held by hands that were congruent or incongruent with those used premorbidly by the patients. The images were also shown from a 1st- and 3rd-person perspective. There was an overall reduction in extinction for objects colocated for action. In addition, there was an extra benefit when the objects were held in hands congruent with those used by the patients and when the objects were seen from a 1st-person perspective. This last result fits with an effect of motor simulation, over and above a purely visual effect based on positioning objects correctly for action. Experiment 2 showed that effects of hand congruence could emerge with images depicted from a 3rd-person perspective when patients saw themselves holding the objects. The data indicate 2 effects of action information on extinction: (a) an effect of colocating objects for action, which does not depend on a self-reference frame (a visual effect), and (b) an effect sensitive to object–hand congruence, which does depend on a self-reference frame (a motor-based effect). The self-reference frame is induced when stimuli are viewed from a 1st-person perspective and when an image of the self is seen from a 3rd-person perspective. Both visual and motor-based effects of action information facilitate the spread of attention across objects. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献