查询词典 permutation group

A fast algorithm for calculating the inverse and Moore-Penrose inverse of the permutation factor circulant matrix is presented. Then, a fast algorithm for the product of the permutation factor circulant matrix is given. Finally, The least-square solutions of inverse problems and the optimal approximation problems for the permutation factor circulant matrix are discussed.

首先给出了一种求n阶置换因子循环矩阵的逆阵、自反g-逆、群逆、Moore-Penrose逆的快速算法，然后给出了计算两n阶置换因子循环矩阵之乘积阵的一种快速算法，最后给出了其反问题的最小二乘解的存在性定理及它的一般表示，并证明了逼近矩阵的存在唯一性且给出它的具体表达式。

An almost perfect nonlinear exponential permutation with high algebric degree is proposed, with some discussion on how to select the parameters of such permutation. The experimental result shows us a conjecture that there exists no such permutation over even dimensional space.

作者所取得的主要研究结果如下：(1)讨论了分组密码的条件攻击和技术攻击方法；全面总结了分组密码算法设计应当遵循的七项准则；概括了分组密码的四种强化技术；设计了一种新的三重加密方案NTE。

The four round MISTY-type and the three round dual MISTY-type transformation are optimized by replacing the first round pseudorandom permutation with XOR-universal permutation and employing identical pseudorandom permutation in the second and the third round.

在保持其安全性不变的情况下，把4轮MISTY结构中第1轮的伪随机置换，用一个XOR-泛置换代替，第2，第3轮采用相同的伪随机置换，3轮结构中第1轮的伪随机置换用XOR-泛置换代替，其它轮相同。

In terms of Latin squares, an isotopy is given by a permutation of rows α, a permutation of columns β, and a permutation on the underlying element set γ.

在拉丁方中，三元组由第α和第β列的一个置换以及其余集合上的一个置换γ给出。

If the sequence is already in the last permutation, then next_permutation reorders the sequence to be the lowest permutation and returns false. Otherwise, it transforms the input sequence into the next permutation, which is the lexicographically next ordered sequence and returns true.

如果序列已经是在最后一个排列中，则 next_permutation 将序列重新排列为最低排列并返回 false；否则，它将输入序列变换为下一个排列，即字典序的下一个排列，并返回 true。

In order to extend the effect and security of image encryption algorithm.An image encryption algorithm is presented based on three-dimension chaotic system and bit-computation.The permutation sequences and binary sequences are generated using three-dimension chaotic system.Firstly,the image is pretreated using chaotic system and permutation transformation,then the pixel's gray value's bit sequences are permuted using the permutation sequences generated before,at last,the pixel's gray value's bit sequences are computed by using XOR operating and the binary sequences.

为了改进图像加密算法的安全性和效率，提出了一种基于三维混沌系统和位运算的数字图像加密算法，利用三维混沌序列的坐标分量分别产生置换序列和二值序列，在对待加密图像进行预处理的基础上，先应用混沌置换序列对预处理的结果图像进行基于灰度值位序列的置换操作，然后再应用产生的二值序列对结果图像的灰度值位序列进行位异或加密运算。

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迄今为止，已成功成为沃尔玛集团、百威啤酒、青岛啤酒、华润蓝剑、可口可乐、百事可乐、统一企业、顶新集团、娃哈哈集团、太平洋保险、招商银行、建设银行、海尔集团、长虹集团、嘉陵集团、宗申集团、红塔集团、宏声集团、新希望集团、雅戈尔集团、太极集团、阳光100地产集团等众多知名企业的伞类供应商。

Three hundred and twenty-four crossbred (Landrace×Yorkshine) barrows with average body weight of 27 kg were randomly assigned to 6 dietary groups: group Ⅰ(chlorotetracycline group, added 50 mg/kg chlortetracycline in basal diet); group Ⅱ(origanum oil group, added 20 mg/kg oreganum oil in basal diet); group Ⅲ(probiotics group, added 1.5 g/kg probiotics in basal diet); group Ⅳ(nutrient enhancement group, elevated dietary vitamin E, vitamin B family and micro elements Zn, Mn, I); group Ⅴ(origanum oil+nutrient enhancement group); group Ⅵ(probiotics+nutrient enhancement group).

试验选用平均体重27 kg，健康长×大杂交阉公猪324头，随机分为6组：Ⅰ组（金霉素组，在基础日粮中添加50 mg/kg金霉素）、Ⅱ组（牛至油组，在基础日粮中添加20 mg/kg牛至油）、Ⅲ组（益生素组，在基础日粮中添加1.5 g/kg益生素）、Ⅳ组（营养调控组，提高日粮中维生素E和B族维生素、微量元素Zn、Mn和I水平）、Ⅴ组、Ⅵ组。

The three groups were loaded and analyzed under the same loading according to the mean value of the bite force of incisors. RESULTS:(1)The maximum stress of dentin in group A was twice higher than that in group B. The maximum primary stress, minimum primary stress and maximum shear stress of group A were respectively 236.35, 228.83 and 218.05 percent of those in group B. The difference of maximum stress values of group B and group C was neglectable.(2) The maximum stress distribution of dentin in group A and group B was quite different (the stress was concentrated in labial and lingual side of the cervical dentin in group A, otherwise in group B it was concentrated in the area around the alveolar and the labial and lingual side of the dentin which was opposite to the tip of the cast metal post and core). The maximum stress distribution of dentin in group A and group B was almost the same.

结果：(1)从牙本质的应力大小来看，A组中牙本质最大应力值比B组中牙本质最大应力值增大了1倍以上（最大主应力、最小主应力和最大剪切应力A组分别是B组的236.35%、228.83%和218.05%），而B组与C组的牙本质最大应力值相差极小；(2)从牙本质的应力分布位置来看，A组与B组的牙本质最大应力分布位置相差甚远（A组主要集中在牙颈部唇舌侧肩台部的牙本质上，B组主要集中于牙槽嵴顶附近及铸造桩核尾端相对应的唇舌侧的牙本质上），而B组与C组的牙本质最大应力分布几乎在同一位置。

Results l.Serum concentrations of VCAM-1 in PIH (93.39 + 57.3)ug/ml were higher than that in normal pregnant group. Serum concentrations of VCAM-1 in moderate(97.89 + 34.07)ug/ml and severe PIH(132.24 + 60.97)ug/ml were significantly higher than that in normal group.(P.05, P.01). There was no difference between serum levels of VCAM-1 mild PIH and normal pregnant group. 2.Serum levels of IL-6 in PIH group(102.17 ?48. 31)pg/ml were significantly higher than that in normal group(49.16 + 12.9)pg/ml.Serum levels of IL-6 in moderate(95.79+31.19)pg/ml and severe PIH( 127.27+11.3 8)pg,ml were significantly higher than that in normal group. There was no difference between serum levels of PIH in mild PIH (52.13 + 12.90)pg/ml and normal pregnant group. 3. In PIH group, serum concentrations of VCAM-1 correlate with the levels of IL-6,r=0.63. 4.The expression of VCAM-1 in cytotrophoblast of spiral arteries in normal pregnant group(100%) were significantly higher than that in PIH group.Theexpression of VCAM-1 in moderate PIH(37.50%) and sever PIH were lower than that in normal group.There was no difference between the mild PIH and normal group.Conclusions The increased levels of serum of VCAM-1 may participate in the process of vascular endothelium damages in PIH.

结果 1、妊高征组血清VCAM-1浓度为(93.39±57.3)μg／ml明显高于正常妊娠组(44.87±15.60)μg／ml，差别有显著性(P＜0.05)；中、重度妊高征组VCAM-1浓度分别为(97.89±34.07)μg／ml和(132.24±60.97)μg／ml，与正常妊娠组比较，差异有显著性(p＜0.05)和非常显著性(P＜0.01)；轻度妊高征组VCAH-1为(48.46±15.60)μg／ml与正常妊娠组比较，差异无显著性(P＞0.05)。2、妊高征组血清IL-6含量为(102.17±48.31)pg／ml，明显高于正常妊娠组(49.16+12.9)pg／ml，差异有非常显著性(P＜0.01)；中、重度妊高征组IL-6含量分别(95.79±31.19)pg／ml和(127.27±11.38)pg／ml，与正常妊娠组比较，差异有显著性(P＜0.05)和非常显著性(P＜0.01)；轻度妊高征组IL-6含量为(52.13±12.90)pg／ml与正常妊娠组比较，差异无显著性(P＞0.05)。3、VCAM-1与IL-6水平呈明显正相关，r=0.63(P＜0.01)。4、子宫胎盘床螺旋动脉滋养细胞VCAM-1表达，正常妊娠组都存在阳性表达(阳性表达率100％)，妊高征组有10例阳性表达阳性表达率为叩们，差别有非常显著性河＜0.01L 中、重度妊高征组阳性表达率分别为37、50％和0，与正常妊娠组比较，差别有显著性河＜0.05）和非常显著性汀＜0.01太轻度妊高征组阳性表达率为83.33凡与正常妊娠组差别无显著性问＞0.05）。

Panorama Many people are dancing in a large sitting room.

在一个大客厅里，许多人在跳舞。

We fully understand how a microwave oven cooks food, it is first necessary to talk ...

我们充分理解一个微波炉煮的食物，这是首先要谈。。。