多重网络中的创意扩散模型研究

基于线上线下多种渠道的创意扩散研究是企业管理的新兴研究热点之一.为此,引入多重网络理论与传播动力学理论,考虑工作中线下沟通、工作中通过企业社交媒体在线沟通及非工作时间电子沟通三种渠道,构建多种渠道构成的多重网络中的创意扩散模型.研究创意在多重网络中持续扩散的阈值条件,并对创意在多重网络中的扩散过程进行仿真实验.结果表明:1)当员工在单位时间内通过以上各渠道沟通的平均次数较接近时,在多重网络中创意扩散的速度较快,创意扩散的范围较广;2)与匀质网络相比,当非工作时间电子沟通子网络是无标度网络时,在多重网络中创意扩散的速度较快,扩散的范围较广;3)增大子网络层间创意扩散的相互促进作用对整个多重网络中创意的有效扩散有积极影响.     

高温作用后砂岩物理力学性质阈值温度的确定——基于机器学习算法

通过采用机器学习算法，提出了高温作用后砂岩物理力学性质变化的阈值温度的确定方法。基于Python语言，利用K-Means、SVM算法，实现了对样本数据的分类和聚类，确定了阈值温度区间，验证了二分类法的合理性和准确性.结果表明，砂岩样本的阈值温度区间为400~600 ℃，阈值温度上下砂岩的物理力学性质存在显著差异，体现为阈值温度区间以下的岩样物理力学性质较为分散，而阈值温度区间以上的岩样物理力学性质较为集中.     

实时系统开发与PEARL语言

本文讨论了实时系统的特征、开发方法、设计工具、实现手段工具等开发过程中的主要问题,论述了实时系统开发语言PEARL及该语言的对实时系统的主要支持.     

R ＆ D STRATEGIC INVESTMENT IN AN ASYMMETRICAL CASE

This article analyzes R ＆ D investment decisions in an asymmetrical case. The investment decisions share three important characteristics. First, the investment is completely irreversible. Second, there are two kinds of uncertainties over the future returns from the investment and over technology in R ＆ D process, respectively. Third, there is strategic competition in the asymmetrical case. This article presents the optimal investment threshold values and the optimal investment rule of high-efficient firm （leader）, and shows that the investment threshold values are reduced by competition of two firms. Finally, the mixed investment strategies for two firms, the probability that each firm separately exercises the option to invest, and the probability that two firms simultaneously exercise the option are given in the paper.     

Robustness of alternative non‐linearity tests for SETAR models

In recent years there has been a growing interest in exploiting potential forecast gains from the non‐linear structure of self‐exciting threshold autoregressive (SETAR) models. Statistical tests have been proposed in the literature to help analysts check for the presence of SETAR‐type non‐linearities in an observed time series. It is important to study the power and robustness properties of these tests since erroneous test results might lead to misspecified prediction problems. In this paper we investigate the robustness properties of several commonly used non‐linearity tests. Both the robustness with respect to outlying observations and the robustness with respect to model specification are considered. The power comparison of these testing procedures is carried out using Monte Carlo simulation. The results indicate that all of the existing tests are not robust to outliers and model misspecification. Finally, an empirical application applies the statistical tests to stock market returns of the four little dragons (Hong Kong, South Korea, Singapore and Taiwan) in East Asia. The non‐linearity tests fail to provide consistent conclusions most of the time. The results in this article stress the need for a more robust test for SETAR‐type non‐linearity in time series analysis and forecasting. Copyright © 2004 John Wiley & Sons, Ltd.     

一个门限RSA密码体制

传统的门限RSA密码体制由于都是在环Zψ（n )上进行的，而会遇到固有的困难；Zψ（n ）不是域且ψ（n）必须保密，提出了一个新的门限RSA密码体制，通过数学变换克服了以上的困难，并且对它的安全性进行了简要分析。     

科学创新思维中实在和虚拟范畴的流动和转化

实在思维是指科学认识活动中保持真实性的思维活动;虚拟思维是指在思维过程中的一种设想或虚构活动.它们共同构成了科学创新思维的两极.在它们之间的流动和转化中,科学创新得以实现.     

SW规约下的一些性质

本文进一步分析了SW规约下的SW度结构的一些性质,得到了强可计算实数的两个性质.并且证明了给定可计算可枚举实数,可构造出sw归约下不小于该数的低的可计算可枚举实数.     

绝缘栅PMOS的SUPREM—SEDAN联机模拟研究

本文分析及研究了作者对绝缘栅ＰＭＯＳ场效应结构所进行的ＳＵＰＲＥＭ—ＳＥＤＡＮ联机模拟．重点在衬底电阻率（掺杂浓度）与ＭＯＳ结构阈值电压之间的定量关系上得到了与实验完全一致的结果．同时，定量地描述了栅氧层中电离电荷的分布及其行为．揭示了上述效应的机理．     

基于图像分割应用于临床上检测HP的一种快速算法

研究了利用图像分割技术,去辨别染色后的胃部切片是否有HP(Helicobacter Pylori幽门螺旋菌),并给出了一种二维直方图与FCM(Fuzzy Clustering模糊聚类)相混合的图像分割方法.运用色彩特征抽取技术,可以更加精确和快捷地识别HP.