采用非对称渐开线齿轮减少齿根应力的研究

为了减小齿轮的齿根弯曲应力,提高齿轮的传动能力,本文根据非对称渐开线齿轮研究学者提出的齿廓方程构建思路进行了建模,并用NISAⅡ进行了齿轮应力变化的有限元分析。通过分析比较得出使用非对称渐开线齿轮可以提高齿轮的弯曲强度从而提高齿轮的传动能力。     

现代金融中介理论探析

我国目前正处于经济转轨时期，金融体系将向何种模式转变，是一个值得探讨和研究的问题。而金融体系的选择理论(即金融中介理论)也一直是一个热门词汇，因为经济理论的作用不仅在于其对经济实践活动的解释，更在于其对实践活动的指导。本文根据国内外有关金融中介理论的研究文献作一系统整理。     

Applying decision tree induction for identification of important attributes in one-versus-one player interactions: A hockey exemplar

Abstract

Decision tree induction is a novel approach to exploring attacker-defender interactions in many sports. In this study hockey was chosen as an example to illustrate the potential use of decision tree inductions for the purpose of identifying and communicating characteristics that drive the outcome. Elite female players performed one-versus-one contests (n = 75) over two sessions. Each contest outcome was classified as either a win or loss. Position data were acquired using radio-tracking devices, and movement-based derivatives were calculated for two time epochs (5 to 2.5 seconds, and 2.5 to zero seconds before the outcome occurred). A decision tree model was trained using these attributes from the first session data, which predicted that when the attacker was moving at ≥ 0.5 m · s^?1 faster than the defender during the early epoch, the probability of an attacker's win was 1.00. Conversely, when the speed difference at that time was below this threshold the probability of a loss was 0.78. Secondary attributes included defender speed in the lateral direction during the early epoch, and angle of attack (i.e., angle between the respective velocity vectors of the attacker and defender) during the late epoch. The model was then used to predict outcomes of one-versus-one contests from the second session (accuracy = 0.643; area under the Receiver Operating Characteristic (ROC) curve = 0.712). Moreover, decision trees provide an intuitive framework for relating spatial-temporal concepts to coaches, and the suitability of decision trees for analysing the features of one-versus-one exchanges are discussed.     

信息不对称背景下的高职图书馆发展研究

高职院校的体制、机制与图书馆发展需求的信息不对称,内涵建设与图书馆内涵发展的信息不对称,导致了图书馆发展理念的偏差,制约了图书馆生产关系的改善,阻碍了图书馆生产力的发展。用科学的发展观确立高职院校图书馆发展的指导思想,实施人才战略工程提升馆员队伍的职业竞争力,抓住主要矛盾解决高职院校内涵发展的当务之急,是目前高职院校图书馆内涵发展的路径选择。     

基于DDMS模型的BDTI马尔科夫区制转换和持续期依赖特征分析

为探索国际原油运价在周期性波动过程中的区制转换和持续期依赖特征,采用具有持续期依赖特征的马尔科夫区制转换(Duration Dependent Markov Switch,DDMS)模型分析波罗的海原油运价指数(Baltic Dirty Tanker Index,BDTI)的波动规律.结果表明:BDTI具有明显的两阶段区制特征;国际原油运价指数由收缩期(扩张期)状态向扩张期(收缩期)状态的转换概率随着目前状态持续时间的增长而不断增大;在相同的持续期水平下,收缩期状态向扩张期状态的转换概率超过扩张期状态向收缩期状态的转换概率;BDTI的非对称持续期依赖特征与国际原油运输市场的寡头垄断市场结构密切相关。     

煤矿安全生产的博弈分析

为了解决煤矿安全生产问题,在对采矿企业安全生产事故主体的分析基础上,建立了以采矿企业和国家监管机构为主体的博弈模型,最后根据博弈模型分析提出了降低安全生产事故的措施。     

加入WTO：我国管理咨询业务发展的现状及对策

我国加入WTO已迫在眉睫，管理咨询服务的非传统会计服务将面临严峻挑战，因此，完善我国管理咨询类非传统会计服务具有必要性和紧迫性。     

在非均匀荷载作用下半圆环变截面小曲率曲杆的位移分析

材料力学常常只研究等截面杆件,很少讨论变截面杆件。而在工程结构中,有时为了减轻构件重量或满足生产要求,往往需要采用变截面杆件,且作用荷载不是均布。如何用材料力学方法来解决变截面构件位移计算问题在实践中有重要意义。通过深入研究分析,依据材料力学的基本原理,科学建立了数学函数表达式,最后通过积分来计算变截面构件的位移。