A multiple stream generator based on de Bruijn digraph homomorphisms

We propose a method to obtain several streams of pseudorandom numbers based on a backbone generator of the generalized shift register type. The method is based on inverting one cycle in a de Bruijn digraph into many sequences in a higher-order de Bruijn graph via an appropriate graph homomorphism. We apply this technique to twisted generalized feedback shift register generators and to the Mersenne Twister MT19937. Positive results of statistical testing are reported.     

Generating random numbers of prescribed distribution using physical sources

When constructing uniform random numbers in [0, 1] from the output of a physical device, usually n independent and unbiased bits B _j are extracted and combined into the machine number . In order to reduce the number of data used to build one real number, we observe that for independent and exponentially distributed random variables X _n (which arise for example as waiting times between two consecutive impulses of a Geiger counter) the variable U _n : = X _{2n – 1}/(X _{2n – 1} + X _2n ) is uniform in [0, 1]. In the practical application X _n can only be measured up to a given precision (in terms of the expectation of the X _n ); it is shown that the distribution function obtained by calculating U _n from these measurements differs from the uniform by less than /2.We compare this deviation with the error resulting from the use of biased bits B _j with P {B _j = 1{ = (where ] – [) in the construction of Y above. The influence of a bias is given by the estimate that in the p-total variation norm Q ^TV _p = ( |Q()| ^p )^1/p (p 1) we have P _Y – P ⁰ _Y ^TV _p (c _n · )^1/p with c _n p for n . For the distribution function F _Y – F ⁰ _Y 2(1 – 2^–n )|| holds.     

燃气轮机故障诊断专家系统的设计与实现

建立了一个适用于燃气轮机的故障诊断专家系统。介绍了该系统的结构、功能、自学能力和知识库的建立及推理机的实现。知识库采用产生式表示法,其组织结构分为三级：大范围经验知识、小范围经验知识和参考解决方案。系统采用双推理机机制,逆向精确推理用于教学和演示,能够查看和解释系统的推理过程;逆向不精确推理用于实际工作场合,提供具有较高可信度的推理结果。     

Americans are more exposed to difference than we think: Capturing hidden exposure to political and racial difference

Use of name generators (NG) in assessing exposure to political difference has led to the conclusion that disagreement is uncommon. Data from two representative surveys tested a NG modification to probe for exposure to difference. Over half for whom NG results suggest no exposure to difference were able to name an alter who supported an alternative candidate. Over a quarter whose NG results indicate no exposure to a racial difference were able to name someone of the opposite race with whom they’d talked politics. These findings demonstrate that mixed or diverse networks are more common than prior NG research suggests.     

Modeling of Distributed Generators Resilience Considering Lifeline Dependencies During Extreme Events

This article derives distributed generators resilience models considering lifeline dependencies during extreme events. The effects on power resilience of storage capacity, fuel delays, and fuel order placements are analyzed. Results indicate that storage capacity has an important role in improving overall power supply resilience as seen by loads. In addition, the presented models provide a quantifiable approach in evaluating fuel delivery resilience. The models facilitate studying fuel scheduling policies and local fuel storage sizing for specified resilience requirements. It is observed that tank autonomy greatly affects the flexibility in employing scheduling policies supplying fuel to generators. Resilience dependence on buffer autonomy is high during the first few days of extreme events, and this could have considerable effects on managing evacuations and rescue operations.     

互联网平台企业的数据生成者权之构建

互联网经济蓬勃发展,数据资源成为互联网平台企业的核心竞争力。互联网平台企业在经营过程中生成的不具个人信息识别性且具有经济价值的数据集合属于数据财产。当前,数据财产保护面临着立法空白、学理质疑、司法适用窘迫、行业自治不足等重重困境。数据财产权利化在各种质疑中,仍然存在不可否认或替代的正当性,比如,能够激励产业创新、符合公平价值、促进数据资源高效流转等。因此,在评析数据财产法律保护现有路径优劣的基础之上,以互联网平台企业为例,尝试构建一种新型财产权——数据生成者权,并对其权利的内涵性质、权能内容、权利限制、权利保护路径等作出探索,可为数据的法律保护提供一种学术参考。     

细胞自动机组合伪随机序列发生器

结合细胞自动机所特有的单元结构的简单性、单元之间作用的局部性和信息处理的高度并行性等特点,利用细胞自动机产生高速序列;分析了比特与、或、异或运算周期特性,其周期等于各自周期的最小公倍数;证明了比特异或运算的频率特性优于原有的频率特性。研究了比特组合运算的线性复杂独特性,比特与、或运算的线性复杂度等于各自线性复杂度的乘积,异或运算的线性复杂度等于各自线性复杂度之和。利用伪随机特性检测方法和线性复杂度的测试方法的计算机模拟表明细胞自动机组合伪随机序列发生器实现简单、速度高、能有效增加序列周期长,改善序列伪随机统计特性,并能有效增加伪随机序列的线性复杂度。     

新型气体发生器

新型气体发生器克服了启普发生器存在的缺点 ,用气球缓冲气流 ,使用起来更方便 ,更通用 ,可避免有毒气体对环境造成的污染。     

临界流文丘里喷嘴标定流量装置的研究

本文对ＩＳＯ９３００－１９９０标准中没有作出规定的一些重要内容，诸如用临界流文丘里喷嘴标定气体流量计装置中的气源问题和总体布置问题进行理论分析和试验验证．结果表明，在临界流文丘里喷嘴标定气体流量计装置中，采用高压离心式通风机作为气源以取代目前惯用的真空泵装置是切实可行的．所研制的标定装置精度高、总体布置合理，对今后该类标定装置的发展具有指导意义．     

余热锅炉换热元件传热与阻力特性模化实验系统研究

为实现能源岛余热锅炉的优化设计，对其受热面中广泛采用的鳍片管高效换热元件的传热与阻力特性进行系统的研究．应用相似理论研制了鳍片管高效换热元件传热与阻力特性模化实验系统，并应用该系统对一定结构的螺旋鳍片管束进行了实验研究．结果表明，该系统的容量、结构、功能和测量精度能满足对各类鳍片管束及换热器的传热与流动工况进行模化实验研究的需要．