为了研究悬臂梁用不同单元类型计算应力结果与真实测量值的误差和该误差产生的影响因素.首先,用ABAQUS有限元软件对悬臂梁结构进行壳单元建模和实体单元建模,分别计算出Mises应力值,再用经典材料力学方法计算出相同情况下悬臂梁Mises应力值,然后用电阻应变测试法计算出悬臂梁的真实应力值,计算出各种应力计算方法相对于真实测量值的误差.最后,分别计算不同厚度悬臂梁,用壳单元和实体单元分别计算出的Mises应力值,将实体单元计算应力值代替真实测量应力值,得到壳单元计算结果相对于实体单元计算结果的相对误差.研究结果表明,悬臂梁用实体单元计算出的Mises应力值相对于壳单元更加接近于真实测量值.随着悬臂梁厚度的增加,壳单元计算结果的精度越来越小.对于同一厚度的悬臂梁,不同位置处壳单元计算应力值对于真实值的相对误差近似为一常数.

在国内外网络结构和企业核心能力文献回顾基础上,将知识共享、知识整合作为中介变量引入到网络结构与企业核心能力关联关系中,构建网络结构、知识共享与知识整合、企业核心能力间关系的理论模型.根据对117家集群企业进行问卷调查所获得的数据,从网络联系密度、网络稳定性、网络中心性三个维度,运用结构方程模型对网络结构、知识共享与知识整合、企业核心能力间关系进行实证研究.得出如下结论:知识共享、知识整合在网络联系密度与企业核心能力、网络中心性与企业核心能力关系中起着完全中介作用;而在网络稳定性与企业核心能力关系中起着部分中介作用.研究结果进一步揭示网络结构与企业核心能力的关联关系,网络结构可通过知识共享与知识整合中介作用增强企业核心能力.

A growing number of people are paying attention to the microblog,which is an important tool in social media.Comparing with conventional network media,the information propagation on microblog presents some new features such as the big volume of data,rapidity,and timeliness.This paper mainly discusses the methods to analyze information propagation trees,and puts forward two algorithms to generate the trees:a generating algorithm based on reposting relations,and a fast generating algorithm.By experiments,the paper compares the performance of the two algorithms and analyzes the distribution of nodes in the propagation trees.

The level of innovation efficiency of Knowledge Intensive Industry reflects the Knowledge Intensive Industry's independent innovation ability and affects the national and industrial competitiveness.By using the DEA-Malmquist index analysis approach,this paper conducts an empirical study to evaluate the patent innovative efficiency from the following three perspectives: the whole country,twenty-nine provincial regions,and eight comprehensive economic zones with the time series data from 2005 to 2010.It deeply analyses the patent innovation efficiency change of the Knowledge Intensive Industry in different periods and analyses the technical change rate and the rate of change of resource in the process of China's Knowledge Intensive Industry innovation with the index decomposition,and determines the main factors which affect China's Knowledge Intensive Industry innovation.Combining with the results of the empirical study,this paper puts forward the corresponding countermeasures.

科学合理的利益分配机制是保持低碳技术创新联盟稳定运行,实现联盟预期目标的关键。结合低碳技术创新联盟的特点,构建了低碳技术创新联盟利益分配指标体系,提出了基于AHP-GEM-Shapley的利益分配法,运用有效克服Saaty矩阵不一致性问题的AHP-GEM法确定联盟利益分配影响因素权重,使投资、风险、成本和贡献等影响因素定量化,修正了Shapley值法的利益分配策略,实现了兼顾多因素的联盟利益分配策略,通过实证分析验证了该方法的有效性和合理性。

Based on the view of network structure and network cluster,with the support of joint application inventive patent data,we choosed the Cooperative Innovation Networks of Industry-University-Research Institution of equipment manufacturing industry in the northeast three province as our research object,and analysed the effect that how network structure Varibles affected innovation output of network members,found the clustering feature of whole network,discussed the effect that how network feature affected innovation output of network members.Finally,We got the results as follows: In the cooperative Innovation Networks of Industry-University-Research Institution,centrality and structural hole promoted the innovation output of network members,but betweenness centrality played a negative role in promoting the innovation output;the structure feature of central & peripheral was found in the cooperative innovative network,and some institutions with high innovation ability had taken central place in the network;For the oneness of network connection,stabilizing network did not always seriously promote its members' innovation ability;Network density had a great effect on the mediating effect of its network members,so the network members with low innovation ability were apt to choose the network members with high innovation ability to build a technology innovation alliance.

Based on the system of collaborative theory and from the angle of process,this paper divides regional intellectual property strategy system into three sub-systems: development,operation and protection.Using order parameter method,the paper analyses the theoretical frame of synergy running mode of regional intellectual property strategy system with the action of government departments and establishes order and synergetic degree models.Taking the three provinces in northeast China for example,the research makes an empirical analysis,comparing and analysing the order degree and synergetic degree of sub-systems and the system vertically and horizontally,measuring and appraising the operational state of regional intellectual property strategy system.Finally the research verifies the feasibility and effectiveness of the method as well as the scientificity of the research results.

高新技术企业项目投资的关键是项目投资者对项目的选择,而影响项目选择的关键在于对项目投资风险的识别和评价。高新技术企业项目投资风险具有多阶段性和评价要素之间的相互关联性。通过对高新技术企业项目投资风险的识别研究,建立了基于企业生命周期的高新技术企业项目各阶段投资风险评价指标体系,运用熵权群组决策法和理想点法对高新技术企业项目投资风险进行了评价,并给出了投资优选方案。

The key of building high-tech virtual enterprise is choosing good partners those have resource offset advantages and good operating conditions.Based on reviewing research results already made,this paper builds assessment index system for high-tech virtual enterprise partners according to features of high-tech virtual enterprise,and uses different assesment methods with different principles to assess high-tech virtual alternative enterprises with sorting results obtained.Firstly,make KENDALL-W before-the-event consistency check on the sorting results;secondly,this paper defines the best sorting results according to Borda method,Copeland method,single ranking results combination of whole diversity-based method and Spearman after-the-event consistency check,realizing compatibility of assesment methods and the scientificalness and effectiveness of assesment results.

The factors of high-new-tech enterprise R&D project investment risk were relevant and had Multi-stage, this paper used the method of experts consultation to find the evaluation indexes out, constructed evaluation indexes system of high-new-tech enterprise R&D project Multi-stage investment risk based on Life cycle of enterprises, evaluated the high-new-tech enterprise R&D projects with the method of TOPSIS, got the sorting of high-new-tech enterprise R&D projects considering objective weight and subjective weight.

Knowledge transfer in civil-military integration innovation system is one kind of knowledge transfer that occurs in defense-related technology field and civil technology field,which promotes the core competitiveness of the national defense enterprise and private enterprise.Based on hypercycle theory,this paper analyses the characteristics of civil-military integration innovation system and builds a knowledge flow network diagram of the system.Combined with the features of Civil-military integration innovation system and according to the three dimensions of knowledge transfer reaction cycle,knowledge transfer catalysis cycle and knowledge transfer hypercycle,a knowledge transfer super cycle model of civil-military integration innovation system is constructed.The paper also researches and analysises the co-evolution mechanism of civil-military integration innovation system of knowledge transfer and reveals the system's creative effects on its members

The M&A financing risk management has become a front and hot issue in the field of management science and engineering research, and M&A Financing Risks evaluation is a very critical part of the M&A financing risk management. Set seven indicators according to the reasons for the formation of M&A financing risks, distinguish key evaluation indicators using of group decision-making characteristic roots method, and test the relevance and identification capacity of indicators, Build a critical, non-relevance, and strong Identification capability acquisition financing risk evaluation index system.

本文结合企业并购的尽职调查内容、并购后的预期整合效果、并购双方的协同效应等构建了初始的、覆盖面较广的目标企业评价指标体系,并运用群组决策特征根法对目标企业评价指标进行筛选,得出了目标企业的关键评价指标。