基于DEA方法的城市交通环境可持续发展评价方法研究

简要介绍了DEA方法,建立了城市交通环境可持续发展评价体系,并对评价模型进行了计算与分析.     

经费不确定形势下高校图书馆文献信息资源建设应对策略

经费是图书馆文献信息资源建设的生命线.2021年3月25日,教育部2021年部门预算正式公布,高等教育支出较上一年度减少56亿元,同比减少5.26％.而高校积极响应教育部"停课不停教、停课不停学"倡议,在线教学和科研全面开展,师生对图书馆电子资源全面保障的需求更加迫切.在未来经费不确定的形势下,如何未雨绸缪预判用户需求与发展态势,如何更为合理地制定应对策略,从而更有成效地进行文献资源建设,应是研究的重点.文章将构建基于"全流程"和"全评价"的"双全"文献信息资源建设应对模式,从优化经费分配制度、精细管理采购合同、变革文献信息资源建设模式等多维度进行理论凝练和案例研究,提出文献信息资源重要度排序、校院两级文献信息资源盘活、合同文本内容标准化、采购过程规范化、定价模式谈判、采购方式评估等多项应对策略.本研究同时可为高校图书馆应对经费缩减开展文献信息资源建设提供借鉴参考.     

中国古代家族法规的功能和作用分析

本文通过整理学界的研究成果,以文献综述的形式出发,梳理家族法的基本理论和历史发展脉络,进而分析家族法的功能和作用,以传统家族法为研究视角,为现今法制建设提供启示。     

环境工程专业实验实践课程体系探究——以湖南农业大学环境工程专业为例

环境工程专业是实践性、实用性、社会性很强的综合性专业,对实验实践教学要求较高。文章对湖南农业大学环境工程专业当前实验实践课程体系现状进行深入分析,剖析湖南农业大学环境工程专业实验实践教学中存在的主要问题,并针对这些主要问题提出相应对策,为实现卓越计划和专业综合改革建立新型实验实践教学体系提供理论依据。     

Asymptotically necessary and sufficient stability conditions for discrete-time Takagi–Sugeno model: Extended applications of Polya's theorem and homogeneous polynomials

The stability and stabilization conditions of the nonlinear system in Takagi–Sugeno's form are considered. The homogeneously polynomially nonquadratic (HPNQ) Lyapunov functions and homogeneously polynomially parameterized (HPP) state feedback laws are adopted. By generalizing the procedure based on the Polya's theorem, the asymptotically necessary and sufficient (ANS) stability and stabilization conditions in the case of HPNQ Lyapunov functions and HPP control laws are reformulated. The major contribution of this paper is to give the parallel results using the multiple indices, so that the slack matrices can be extensively utilized to improve the numerical efficiency. The effectiveness of the results is illustrated by the numerical examples.     

Improved stability criteria for uncertain neutral-type Lur׳e systems with time-varying delays

This paper is concerned with the robust stability of uncertain neutral-type Lur?e system with time-varying delays and sector bounded nonlinearities. By constructing a modified Lyapunov–Krasovskii functional (LKF), some new robust stability criteria are proposed in terms of linear matrix inequalities (LMIs) without using the general free-weighting matrix method. The criteria are less conservative and more efficiently calculative than some previous ones. Four numerical examples are presented to show the effectiveness and merits of the proposed approach.     

Decentralized global stabilization for stochastic high-order feedforward nonlinear systems with time-varying delays

This paper studies the problem of decentralized stabilization for a class of large-scale stochastic high-order time-delay feedforward nonlinear systems. A series of delay-independent state feedback controllers is constructed, which is based on the approach of adding one power integrator. The stochastically global asymptotic stability (GAS) of the closed-loop system under the above-mentioned controllers is proved by Lyapunov–Krasovskii theorem and homogeneous domination approach. A simulation example is given to illustrate the effectiveness of the results of this paper.     

A new decision to take for cost-sensitive Naïve Bayes classifiers

Practical classification problems often involve some kind of trade-off between the decisions a classifier may take. Indeed, it may be the case that decisions are not equally good or costly; therefore, it is important for the classifier to be able to predict the risk associated with each classification decision. Bayesian decision theory is a fundamental statistical approach to the problem of pattern classification. The objective is to quantify the trade-off between various classification decisions using probability and the costs that accompany such decisions. Within this framework, a loss function measures the rates of the costs and the risk in taking one decision over another.     

Detecting verbose queries and improving information retrieval

Although most of the queries submitted to search engines are composed of a few keywords and have a length that ranges from three to six words, more than 15% of the total volume of the queries are verbose, introduce ambiguity and cause topic drifts. We consider verbosity a different property of queries from length since a verbose query is not necessarily long, it might be succinct and a short query might be verbose. This paper proposes a methodology to automatically detect verbose queries and conditionally modify queries. The methodology proposed in this paper exploits state-of-the-art classification algorithms, combines concepts from a large linguistic database and uses a topic gisting algorithm we designed for verbose query modification purposes. Our experimental results have been obtained using the TREC Robust track collection, thirty topics classified by difficulty degree, four queries per topic classified by verbosity and length, and human assessment of query verbosity. Our results suggest that the methodology for query modification conditioned to query verbosity detection and topic gisting is significantly effective and that query modification should be refined when topic difficulty and query verbosity are considered since these two properties interact and query verbosity is not straightforwardly related to query length.     

盈利能力、技术创新能力与资本结构—基于高新技术企业的实证分析

基于126家沪市A股上市高新技术企业2008-2010年的数据,利用面板数据模型,研究了技术创新能力与高新技术企业资本结构间的关系,并考察盈利能力对"关系"的影响。研究表明,高新技术企业的研发人员投入、专利授权量(公开量)与负债水平正相关,而研发资金投入、发明专利申请量与负债水平负相关。盈利能力的"风险基准"降低作用与"激励动机"提升作用并存。拥有高盈利能力的高新技术企业可能会为了提高员工的研发积极性,在某些情况下,虽有"风险基准"降低的优势,但更倾向使用股权融资,即"激励动机"的提升作用。本文丰富了现有研究,为高新技术企业的融资决策提供了有益的借鉴。