一种基于连通度的电力信息网络生存性分析方法

基于电力信息网络的连通性,提出了电力信息网络绝对生存等级、相对生存等级以及关键服务失效率等概念及指标,分别从系统整体性、系统关键服务以及系统服务对系统整体性的依赖程度3个方面确定了电力系统信息网络的可生存性评定方法.针对一个具体的实例,通过Dijkstra算法计算链路权值,得到电力信息网络的可生存性指标,说明该方法的可行性,并提出提高现有信息网络可生存性的方法.     

当代文学作品中农民工融入城市的生存困境

当代文学的农民工题材作品揭示出特定时代的文学创作状况与当时社会变迁之间纷繁复杂的联系。在众多的作品中,作家 通过展现转型时期农民工精神与肉体的创伤及女性农民工遭受的性别歧视,将农民工进入城市后的游离、挣扎、伤痛等复杂心态 展现地淋漓尽致。通过文学作品对农民工生存困境的审视和关照,反思农民工所受创伤背后的文化现象,寄予弱势群体最诚挚的 人文关怀,彰显作家借助文学关注社会、关注人的价值理念。     

基于凸策略优胜劣汰蚁群算法的机器人路径规划

针对机器人在已知静态工作环境中运动路径的快速选择和判优, 提出一种改进蚁群优化算法. 该算法首先对机器人的静态工作空间进行凸策略处理, 从环境上降低了搜索的盲目性和落入陷阱的可能性, 并在此基础上加入一种优胜劣汰策略, 进一步提高了算法的时间性能、最佳性能和鲁棒性. 实验结果表明改进的蚁群优化算法不仅克服了易于陷入局部最优解及运算量大的缺陷, 而且也大幅度提高了算法的运算效率.     

Analyzing survival curves at a fixed point in time for paired and clustered right-censored data

In clinical trials, information about certain time points may be of interest in making decisions about treatment effectiveness. Therefore, rather than comparing entire survival curves, researchers may wish to focus the comparison on fixed time points with potential clinical utility. For two independent samples of right-censored data, Klein et al. (2007) compared survival probabilities at a fixed time point by studying a number of tests based on transformations of the Kaplan-Meier estimators of the survival function. To compare the survival probabilities at a fixed time point for paired right-censored data or clustered right-censored data, however, their approach requires modification. In this paper, we extend the statistics to accommodate possible within-pair and within-cluster correlation. We use simulation studies to present comparative results. Finally, we illustrate the implementation of these methods using two real data sets.     

长白山区林蛙养殖实用技术浅析

林蛙营养丰富、经济价值特别高,越来越被人们所喜爱。林蛙养殖在长白山区已成为重要产业项目,其养殖户及养殖规模在不断增加和扩大,其现有符合林蛙养殖自然条件的区域已几近饱和。如何提高林蛙单产已成为当地林蛙养殖需要迫切解决的问题。本文通过多年的养殖实践,总结了长白山区林蛙养殖如何通过培育林蛙优良品质、提高林蛙成活率,林蛙安全越冬和疾病防治等技术措施,实现在现有养殖规模下提高林蛙单产,增加林蛙养殖效益进行了探讨。     

一种基于LEACH与PEGASIS协议的分层成链优化路由算法

为了延长无限传感网的生命周期,提高数据传输的实时性.综合了LEACH和PEGASlS算法的优点,提出了一个新型路由协议算法(Linking of Delamination Based PERASIS and LEACH protocol,LDPBL).该路由算法采用三层网络结构,从上至下依次为BS层,簇头层,簇内节点层...     

Record value based on intuitionistic fuzzy random variables

This paper extends some basic concepts associated to record value based on intuitionistic fuzzy random variables. In this approach, αβ-values of intuituinistic fuzzy numbers are employed to construct intuitionistic fuzzy cumulative distribution function and its common estimator, an extended entropy and its estimator, intuitionistic fuzzy (upper) record value and its common estimator. Main property of the proposed concepts include large sample properties which are investigated in the space of intuitionistic fuzzy numbers. Some numerical examples are also illustrated to clarify the concepts and methods.     

人参等复方中药功能液对小白鼠的抗缺氧作用

研究了小白鼠在常压缺氧和急性脑缺氧条件下使用人参等复方中药功能液对其抗缺氧能力及外周血象中红细胞数量和血红蛋白含量的影响;并研究了提高小白鼠机体抗缺氧作用显效的人参等复方中药功能液最佳剂量和使用最佳时间。结果表明:此人参等复方中药功能液能不同程度地延长小白鼠在缺氧条件下的存活时间及脑存活时间,增加小白鼠血液中的红细胞数量(RBC值)和血红蛋白含量(HGB值),对心、脑功能具有一定的保护作用。用该功能液给小白鼠灌胃,当剂量为0.3mL/天·只,时间为4h时小白鼠的抗缺氧能力最强,并且对小白鼠体重的增长无显著影响。     

Survival Science: Crisis Disciplines and the Shock of the Environment in the 1970s1

The 1970s mark a critical departure point in the history of science. The rise of the environmental crisis prompted not just new avenues of scientific inquiry but also the integration of scientific expertise into complex interactions with politics and society. This paper investigates the history of the new ‘crisis disciplines’ that emerged in response to explicit fears that the world was on the verge of ecological collapse. Crisis disciplines – a term coined by the conservation biologist Michael Soulé – engage in the urgent and reactionary pursuit of solutions to pressing environmental problems and the evidence scientists bring to bear on their work. Crisis disciplines involve acting ‘before knowing all the facts’, and therefore constitute ‘a mixture of science and art, and their pursuit requires intuition as well as information’. Combined, diverse crisis disciplines constitute a new kind of ‘survival science’, which emerged in the 1970s.     

基于IKGC-PSO算法的无人机三维路径规划系统

为了解决标准粒子群算法在无人机三维路径规划中存在的易陷入局部最优、动态化不足和路径平滑性差等问题,提出了一种基于粒子群算法和遗传算法的,融入K均值精英化和柯西变异的优化算法;采用K均值聚类算法进行精英初始化,优化粒子种群的分布;动态化学习因子,强化惯性权重的全局性,保留粒子群算法收敛速度快的优点;融入遗传思想,采用柯西变异的方法,提高寻解最优解的能力;在对比实验中,模拟了实际的复杂三维环境,选取了路径总长度、飞行高度差以及马尔科夫生存状态组成目标函数;结果表明改进算法的鲁棒性提高了98%,求解质量相较于IPSO算法和PSO算法分别提高了5.8%和10.6%,验证了优化后方法的有效性和鲁棒性。