Latent classes and group membership

A technique for analyzing group membership data, such as interlocking directorates, based on the assumption of latent classes of individuals, is described and illustrated with two data sets. The technique partitions individuals and/or groups into homogeneous sets and can be used to create measures of structural centrality for groups and for individuals.     

信息网络技术对大学生认知方式的影响与“两课”教学教育手段创新

信息网络的普及和迅猛发展对大学生认知方式产生着潜移默化的影响,从哲学和认知心理学的角度探讨信息网络技术对大学生认知方式的影响,适应数字化、网络化技术革命的要求,革新高校马克思主义政治理论课和思想品德课(以下简称"两课")教育教学的手段,对于提高"两课"的时效性和教育教学效果,引导他们自觉地构建科学的认知方式,消除互联网络对大学生认知的负面作用,具有重要的理论的和应用的价值.     

CALIS对高校图书馆文献信息资源建设的作用

CALIS是中国高等教育文献保障体系,对高校图书馆的现代化建设起着至关重要的作用。本文从CALIS系统的服务功能及其对高校图书馆文献资源建设的意义入手,对高校图书馆如何利用CALIS搞好文献信息资源建设,实现文献信息资源共建与共享进行了探讨。     

论网络对当前高校思想政治教育的影响

随着信息的全球化和直通化 ,网络日益显露出它快捷、灵通和多功能的优越性 ,并且其发展变化异常迅猛。不容置疑 ,网络确实扩大了人们的视野使整个世界成为了一个小小的地球村 ,但它对我们产生的影响也应引起我们的重视 ,尤其重视它对当前高校思想政治教育工作的影响     

The differential contributions of teen drinking homophily to new and existing friendships: An empirical assessment of assortative and proximity selection mechanisms

Alcohol use is pervasive in adolescence. Though most research is concerned with how friends influence drinking, alcohol is also important for connecting teens to one another. Prior studies have not distinguished between new friendship creation, and existing friendship durability, however. We argue that accounting for distinctions in creation–durability processes is critical for understanding the selection mechanisms drawing drinkers into homophilous friendships, and the social integration that results. In order to address these issues, we applied stochastic actor based models of network dynamics to National Longitudinal Study of Adolescent Health data. Adolescents only modestly prefer new friendships with others who drinker similarly, but greatly prefer friends who indirectly connect them to homophilous drinkers. These indirect homophilous drinker relationships are shorter lived, however, and suggest that drinking is a social focus that connects adolescents via proximity, rather than assortativity. These findings suggest that drinking leads to more situational and superficial social integration.     

证券市场并购目标的财务特征分析和预测研究

应用自组织映射神经网络（SOM）和Hopfield神经网络模型对上市公司并购目标公司进行了实证研究。SOM网络的聚类分析表明目标公司可分为6个类别,各类别之间差异较大,目标公司明显区别于非目标企业,在总体上具有盈利能力低、经营能力差、偿债能力较强的特点。Hopfield网络模型的预测结果显示,目标企业的平均预测准确率为80．69％,非目标企业的预测准确率为61。33％,由于并购交易发生受多种因素影响,财务指标与其它因素相结合方能提高模型预测的效果。     

多维特征视角下基于图卷积网络的专利技术领域自动识别研究

专利审查周期缩短政策的提出与专利申请数量急剧增加的现状给实现专利技术领域识别的专利分类工作带来巨大挑战,如何引入专利自动分类技术提高专利分类工作效率、缩短专利审查周期成为重要研究主题。本文提出基于多维特征和图卷积网络的专利技术领域自动识别方法。该方法根据文献计量学与图表示学习理论从专利摘要、引证专利、专利发明人维度提取专利特征;其次利用专利摘要维度特征生成表征专利文本特征的专利-核心词汇异构网络,并将引证专利、专利发明人维度特征作为专利数字特征嵌入专利-核心词汇异构网络;通过图卷积网络进行半监督学习,确定专利-核心词汇异构网络中专利节点的类别标签,完成专利自动分类任务。为验证本文所提方法的识别效果,采用Incopat全球专利数据库中专利数据进行实验;实验结果表明专利文本特征与专利数字特征共同作为专利特征可以提高专利分类准确率,引证专利信息的引入可以提高专利分类准确率。同时,本文所提方法也给专利技术领域自动识别问题提供新解答思路,为缩短专利审查周期政策的实施提供支撑。     

Integrating commercial and residential pickup and delivery networks: A case study

This paper presents a strategic analysis of the network design problem faced by pickup and delivery companies operating in metropolitan areas and serving two or more classes of customers. The focus is on a division that treats commercial and residential customers separately, a situation motivated by their respective geographic densities and the size and frequency of their demand. In constructing driver work areas, it is necessary to take into account expected demand, vehicle capacity, time on the road, and the aspect ratio of the individual territories. This leads to a capacitated clustering problem with side constraints that has been the subject of intense research over the last decade.     

Intelligent scheduling model and algorithm for manufacturing

This paper puts forward an intelligent scheduling model based on Hopfield neural network and a unified algorithm for manufacturing. The energy computation function and its dynamic state equation are derived and discussed in detail about their coefficients (parameters) and steps (Delta t) in iteration towards convergence. The unified model is focused on the structure of the above function and equation, in which the goal and penalty items must be involved and meet different schedule models. The applications to different schedule mode including jobshop static scheduling, scheduling with due-date constraint or priority constraint, dynamic scheduling, and JIT (just in time) scheduling are discussed, and a series of examples with Gantt charts are illustrated.     

Resource smoothing: A cost minimization approach

From the available literature, there seems to be no defined approach to resource smoothing exercise except those attempted by Weist (1967, Management Science, 13, B359-B377) and Burgess and Killebrew (1962, Journal of Industrial Engineering, 13, 76-83). The aim of the smoothing exercise is to achieve optimal resource usage by avoiding high peaks and deep valleys in the project resource profile. The general approach has always been to move some activities with floats in the high peak regions to be started at a later date, and as this is done, the valleys will be filled to smooth the resource profile subject of course to time constraint. If this approach is followed as it is, it would be difficult to determine optimality especially when many resources are involved. A cost minimization approach is envisaged in the present study with no limitation on the number of resource inputs. In a situation where the resources are assumed to have the same value, the cost assigned to each of them should be similar. The method follows the general concept but with a difference; cost of the activity in question is considered. The exercise is continued until all the floats are exhausted. The optimum result would then be the one with the minimum cost profile. From examples used for the evaluation, the results obtained are comparable to those of the above two researchers, and some with better results in the majority of cases.