Analysis of the design methods of word oriented linear feedback shift registers

Based on analysis of the structure characteristics and implementation methods of some representative word oriented linear feedback shift registers （LFSRs） in several modem software oriented stream ciphers, this paper firstly classifies the word oriented LFSRs into two classes： the machine instruction type and the arithmetic type. The similarities and differences between each type are illustrated by concrete examples. Then we give a detailed analysis about the word oriented LFSRs in each category from design structure, cryptographic properties and implementation issue aspects. Finally, some basic design criteria for modem word oriented LFSRs and suitable for software implementation are summarized.     

一种基于投影标靶的手眼相机标定方法

文章研究了一种基于投影标靶的手眼相机线性标定方法.该方法确定了半物理仿真系统中各组成部分之间的位置关系,以保证标定的正确、有效进行;规定了标定用的投影标靶设计原则,以保证标定的精度;改变了传统线性标定算法坐标系的建立方法,以保证由标定结果分解的外参数满足位姿测量的要求.实验结果表明,该方法的标定精度满足位姿测量的要求,是一种可行和有效的标定方法.     

基于遗传算法的模拟电路多目标设计

模拟电路在传感器匹配、信号转换和数据采集等仪器仪表子系统中起着不可替代的作用,而人为优化一个模块需要耗费大量的时间和精力;文章提出的基于遗传算法的电路自动进化是解决这一问题的有效途径,可以大大节省模拟电路的设计周期,在电路设计初期具有很好的借鉴意义.     

基于平衡的微型燃气轮机回热循环效率分析

对采用回热循环的微型燃气轮机进行了正、反平衡效率分析,推导了正、反平衡效率一致性的数学模型.结合微型燃气轮机实例,计算了正、反平衡的效率,并进行了分析的可靠性检验,检验结果表明,实例中的正、反平衡效率偏差和偏差率都很小,分析结果可靠.通过反平衡效率分析,得出了微型燃气轮机的主要损部位,提高微型燃气轮机效率可主要从改进燃烧室和回热器入手,对于排气中的损失可采用结合余热利用装置加以利用.     

浅谈移动IPv6切换问题

移动切换是移动IP中的关健技术之一,对于移动IP的性能有着重要的意义。文章介绍几种主要的切换策略。     

从"言志"到"缘情"——简论唐前诗歌理论的嬗变

中国上古社会文史哲三位一体,"诗言志"起源很早,从汉代起.由于个人意识的强化和审美意识的觉醒,诗歌从强调个体的社会责任转而强调个体审美活动,产生了"诗缘情"说.两者相互配合,共同促成了唐代诗歌高潮的到来.     

胍乙酸壳聚糖的合成及其吸湿保湿性能的测定

以自制壳聚糖和1-氯胍乙酸为原料合成胍乙酸壳聚糖,并对其进行吸湿保湿性能测定.研究结果表明,合成产物具有一定的吸湿保湿性能,具有进一步开发价值.     

Clinical investigation of surgery for intermittent exotropia

Objective： To investigate the time and postoperative binocular vision of strabismus surgery for children with intermittent exotropia （X（T））. Methods： A retrospective investigation was conducted in 80 child patients with intermittent exotropia. Pre- and postoperative angles of deviation fixating at near （33 cm） and distant targets （6 m） were measured with the prolonged alternate cover testing. The binocular function was assessed with synoptophore. Twenty-one patients took the postoperative synoptophore exercise. Results： （1） A week after surgery, 96.2% of the 80 patients had binocular normotopia, while a year after surgery, 91.3% of the 80 patients had binocular normotopia; （2） Preoperatively, 58 patients had near stereoacuity, while postoperatively, 72 patients achieved near stereoacuity （P〈0.05）; （3） Preoperatively, 64 patients had Grade Ⅰ for the synoptophore evaluation and postoperatively, 76 patients achieved Grade Ⅰ. Meanwhile, 55 patients had Grade Ⅱ preoperatively and 72 achieved Grade Ⅱ postoperatively. For Grade Ⅲ, there were 49 patients preoperatively and 64 patients postoperatively （P〈0.05）; （4） Patients of 5-8 years old had a significantly better recovery rate of binocular vision than those of 9-18 years old （P〈0.05）; （5） Patients taking postoperative synoptophore exercise had a better binocular vision than those taking no exercise （P〈0.05）. Conclusions： （1） Strabismus surgery can help to preserve or restore the binocular vision for intermittent exotropia; （2） Receiving the surgery at young ages may develop better postoperative binocular vision; （3） The postoperative synoptophore exercise can help to restore the binocular vision.     

曲靖师范学院校园种子植物名录及植物配置合理性的分析

校园绿化是学校建设的重要组成部分,植物配置在校园绿化中起着重要作用.通过实地调查编制出曲靖师范学院新校区校园植物名录,共记录植物68科134属180种,其中云南本地种128种,非本地种52种(其中入侵种2种).植物属的分布类型以北温带为主.教学办公区植物配置比较合理,体育场和生活区出现以草代木现象,缺少观花植物和荫蔽树种.