论风险投资中的风险企业价值评估--一种基于多阶段复合实物期权的分析

风险企业价值评估是进行风险资本运作的基础，传统的价值评估方法已经难以全面评估风险企业的价值，无法满足风险投资的要求。而近年来实物期权理论的发展和完善为我们评估、发现和提升风险企业价值提供了一种全新的方法。本文将基于风险企业的高风险和多阶段特点，运用实物期权理论的方法，构建风险企业价值评估的多阶段复合实物期权模型，希望该评价模型有助于我国风险投资的实际运作。     

Robust control for discrete-time singular large-scale systems with parameter uncertainty

This paper addresses the problem of robust stabilization for uncertain discrete-time singular large-scale systems with parameter uncertainties. The system under consideration is not necessarily regular. The parameter uncertainties are assumed to be time invariant, but norm-bounded. The purpose of the robust stabilization problem is to design state feedback controllers such that, for all admissible uncertainties, the closed-loop system is regular, causal and stable. In terms of strict LMIs, sufficient conditions for the solvability of the problem is presented, and the parameterization of desired state feedback controllers is also given. A numerical example is given to demonstrate the applicability of the proposed design approach.     

科研管理的不确定性及其定量化方法

本文讨论了分析和处理科研管理问题的方法和特点，研究了科研管理中的不确定性信息的三种形成（随机信息、模糊信息和灰色信息），阐述了用数学方法进行了确定性信息定量化分析的思路。     

物理量极限原理

根据众所周知的物理实验和物理理论,提出物理量极限原理:在我们的宇宙里,任何描述物理状态或 物理过程的物理量都具有有限值;任何具有物理意义的物理量都必须是非发散的.     

Hanging tough: post-PhD researchers dealing with career uncertainty

ABSTRACT

This study examines the impact of career uncertainty on post-PhD researchers’ experiences. Drawing on an identity-trajectory approach and a qualitative design, we analysed experiences of post-PhDs from the UK and Switzerland. Our findings show that in the course of their work experiences, career uncertainty takes two different forms: intellectual uncertainty and occupational uncertainty. On a daily basis, both forms strongly impact the participants’ work and personal lives and can limit their ability to plan for the future, restrict their developing research expertise and networks and induce tension in trying to reconcile work and personal lives. While often struggling with a blurred institutional status, participants ‘hang tough’ despite their uncertain situation, notably by clinging to the academic researcher identity. Contributing to the previous work on the increasing casualisation of post-PhD positions and the resulting challenges, our study offers new insights into how different aspects of career uncertainty influence post-PhDs’ work and identity.     

封闭法测平面度误差时不确定度的计算方法

在精密测量中要求对测量结果的不确定度进行评估 .本文通过实例分析 ,指出用封闭法测平面度误差时 ,测量结果不确定度应该按相关计算法求得 .这一方法大大改善了按独立测量计算不确定度存在的问题 ,提高了测量精度 .该法对平板检定具有一定的参考价值 .     

离散广义系统的鲁棒正实性分析

研究了具有线性分式形不确定性离散广义系统的鲁棒正实性问题．利用线性矩阵不等式给出了不确定性离散广义系统二次容许且严格正实的充分条件．     

Students’ views of uncertainty in formal and personal science

Background: Uncertainty is a crucial element of scientific knowledge growth. Students should have some understanding of how science knowledge is developed and why scientific conclusions are considered more or less certain than others. A component of the nature of science, it is considered an important aspect of science education and allows students to recognize the limitations of scientific research.

Purpose: This study examined Grades 5 and 9 students’ views of uncertainty in their personal scientific research and the formal scientific research of professionals.

Sample: This study included 33 students in Grade 5 (n = 17) and Grade 9 (n = 16). The students were recruited from a charter school that emphasised inquiry instruction.

Design and methods: Data were collected through interviews. Students were asked their views of their inquiry-based projects and their views of professional science.

Results: Interview data and statistical analyses indicated that students recognized uncertainty in personal science, which varied across elements of the scientific process. Additionally, their views of uncertainty in formal science tended to change across grades and knowledge of uncertainty in personal and formal science were positively correlated.

Conclusion: These findings offer insights into the processes by which students come to understand uncertainty in science and point to ways of fostering such knowledge through teaching practices.     

关于不确定关系的一个说明

分析了海森堡不确定关系用于角动量和角坐标这对共轭动力变量时出现的困惑,指出物理上的一种对应关系,并探讨了产生这困惑的理论根源。     

技术进步、不确定性与中国工业企业边界的演进

通过引入技术进步因素,研究其对不确定性的影响。随着技术创新和扩散的常规化,企业内部研发过程,包括研发的技术目标、商业应用、项目获利的不确定性无一例外地增大了。而通过企业外部化行为却降低了这些技术的不确定性,从而促进了边界的有限收缩。中国工业企业1985-2003年的相关数据验证了这个结论。